CJJ 35-1990 Specification for construction and acceptance of steel slag lime road base
Some standard content:
Engineering Construction Standard Full-text Information System
Industry Standards of the People's Republic of China
Construction of Steel Slag Lime Road Base
and Acceptance Specifications
35—90
Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Industry Standards of the People's Republic of China
Construction of Steel Slag Lime Road Base
and Acceptance Specifications
35—90
Editor: Wuhan Municipal Engineering Design Institute Approval Department: Ministry of Construction of the People's Republic of China Implementation Date: October 1, 1990
Engineering Construction Standard Full-text Information System| |tt||kANiKAca
Engineering Construction Standard Full Text Information System
Notice on the Release of the Industry Standard "Construction and Acceptance Specifications for Steel Slag Lime Road Base"
(90) Jianbiaozi No. 178
Construction Committees (Construction Departments) of all provinces, autonomous regions, and municipalities directly under the Central Government, and Construction Committees of all independently planned cities: In accordance with the requirements of the former Ministry of Urban and Rural Construction and Environmental Protection's (84) Chengkezi No. 153 document, the "Construction and Acceptance Specifications for Steel Slag Lime Road Base" edited by Wuhan Municipal Engineering Design Institute has been reviewed and approved as an industry standard with the number CJJ35-90, which will be implemented from October 1, 1999. If you have any questions or comments during the implementation process, please inform Wuhan Municipal Engineering Design Institute in writing. Ministry of Construction of the People's Republic of China
April 21, 1990
Engineering Construction Standards Full-text Information System
Engineering Construction Standards Full-text Information System
Chapter 1
Chapter 2
Raw Materials
Section 1
Section 2
Section 3
Section 4
Section 5
Chapter 3
Fly Ash·
Mixed Materials| |tt||Section 1
Section 2
Section 3
Chapter 4
Mix Ratio
Optimum Moisture Content and Maximum Dry Density
Compressive Strength
Section 2
Section 3
Section 4
Section 5
Section 6
Section 7
Chapter 5
Appendix -
Appendix 2
Appendix 3||t t||Appendix 4
Appendix 5
Preparatory work
Adding or removing water
Spreading and rolling
Early maintenance
Construction measures in rainy season
Quality standards and inspection and acceptance
Design thickness and structural combination
c00000000.000.00005000
Some properties of raw materials and mixtures
e電oc心#6#心cc06 6
Several calculation formulas
Several test methods
Terms used in this specification
Additional explanation
Engineering Construction Standard Full Text Information System
KAONTKAca-
Engineering Construction Standard Full Text Information System
Chapter 1 General Provisions
Article 1.0.1 This specification is formulated to ensure the quality of steel slag lime road base construction, accelerate the rational use of steel slag, and unify standards. Article 1.0.2 Steel slag lime mixture is suitable for the construction of base and subbase of various roads.
Steel slag in this specification refers to the slag produced by open-hearth and converter steelmaking, which is a mixed steel slag in stable block, granular, or powder form after natural decomposition or processing decomposition. Blast furnace slag can also be used for reference.
Article 1.0.3 The construction of steel slag lime mixture road base should try to choose a favorable season. When the daily average temperature is below 5℃, construction is not suitable. In frozen areas, construction must be completed 15 to 30 days before freezing.
Article 1.0.4 In addition to the provisions of this specification, the construction of steel slag lime road base should also comply with the provisions of the current national standards and specifications. Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Chapter 2 Raw Materials
Section 1 Steel
Article 2.1.1 Steel slag must be decomposed stably, the particle size meets the specification requirements, and has the specified strength. Its free calcium oxide content should be less than 3%; the maximum particle size should not exceed 50mm; the crushing value should be less than 30%. Early slag shall not be used alone. Old slag that has been stored for more than one year should be used.
Article 2.1.2 The mass density of steel slag is greater than that of crushed stone, so it should be paid attention to when calculating the amount. When used in various places, it should be based on actual tests. Appendix 2 is the physical and mechanical properties of steel slag for reference.
Section 2 Lime
Article 2.2.1 Lime should be low-magnesium lime, which should be fully digested, without undigested particles and impurities. The content of calcium oxide and magnesium oxide in slaked lime should be greater than 50%; the content of calcium oxide and magnesium oxide in quicklime should be greater than 60%. When the content of undigested particles is greater than 20%, the lime dosage should be increased accordingly. When the content of calcium oxide and magnesium oxide in lime is between 30% and 50%, the lime dosage should be appropriately increased through experiments. When the content of calcium oxide and magnesium oxide in lime is less than 30%, it shall not be used.
Article 2.2.2 The scope of application of lime industrial waste (such as calcium carbide slag, etc.) and lime scraps can be implemented in accordance with Article 2.2.1. Chemical lime scraps should be tested to see if they contain harmful substances to avoid harming humans and animals and polluting the environment. The specific treatment methods can refer to the relevant standards and specifications currently in force in the country. Section 3 Fly Ash
Article 2.3.1 Fine particles collected from the flue gas discharged from the pulverized coal furnace are called fly ash. According to the discharge method, fly ash is divided into dry ash and wet ash. Its chemical composition and physical properties are shown in Appendix 2.
Article 2.3.2 The sum of the content of silicon dioxide and aluminum oxide in fly ash should be greater than 70%, and the loss on ignition at 700°C should be less than 10%. Overly wet fly ash should be piled high and filtered, and overly dry fly ash should be sprinkled with water to prevent flying. The dry density of fly ash should be measured based on local materials and can be 500-800kg/m3. Article 2.3.3 Industrial waste slag belonging to fly ash can also be used after being tested and the data meets the requirements of Table 2.1.1 in JGJ28-86 "Technical Specifications for the Application of Fly Ash in Concrete and Mortar".
Section 4 Soil
Article 2.4.1 The plasticity index of soil added to steel slag lime mixture should be 7 to 17. The organic matter content in the soil should be less than 8%; the total soluble salt content should not exceed 5%, of which the sulfate content should be less than 0.8%. Section 5 Water
Article 2.5.1
Water that does not contain oil and has a pH value greater than 6 can be used to dissolve lime, mix mixtures and maintain health.
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Chapter 3 Mixture
Section 1 Mix Ratio
Article 3.1.1 There are two types of mix ratios for steel slag lime mixtures: the percentage of raw materials in the total dry weight of the mixture is called mass ratio; the number of loose volumes of raw materials is called volume ratio. The laboratory should use mass ratio. Volume ratio control can be used for on-site mixing during construction: mass ratio control is used for factory mixing. Article 3.1.2 The mix ratio of steel slag lime mixtures should be determined through experiments. In production practice, an economical and practical mix ratio must be selected based on the properties of raw materials and equipment conditions, reinforcement effects, application layers and hydrological conditions. The mix ratios listed in Table 3.1.2 can be used for reference during trial mixing.
Common proportions of slag lime mixtures
Mixture types
Slag lime fly ash
Slag lime soil
Slag lime
Article 3.1.3 The proportions of various types of slag mixtures must meet the following conditions: The compacted volume of the binder should be greater than the pore volume of the slag to ensure compaction and surface density.
Optimum moisture content and maximum dry density
Section 2
Article 3.2.1 The moisture content of slag lime mixtures should be close to the optimal compaction moisture content. The maximum dry density and optimal moisture content can be determined by testing according to the test method in Appendix 4, using the heavy hammer engineering construction standard full-text information system
TKAONT KAca-
Engineering Construction Standard Full-text Information System
method or press molding method (12MPa). Table 3.2.1 The range listed in the table is available for selection.
Maximum dry density and optimum moisture content of mixture Type of mixture
Steel slag lime fly ash
Steel slag lime soil
Steel slag lime
Mass ratio
60~70,10~7,30~23
50~60;10~8;40~32
90~95;10~5
Maximum dry density
(kg/m2)
1600~2000
1800~2200
1900~2215
Optimum moisture content
Article 3.2.2 The maximum dry density and optimum moisture content of steel slag lime fly ash (soil) mixture shall be determined by test. It can also be calculated by formula. (See Appendix III). Section 3 Compressive Strength
Strength requirements shall be based on local traffic conditions and layer strength requirements Article 3.3.1
. If there are no specific indicators for a region, refer to the following regulations and Table 3.3.1. Mixture strength grade and applicable scope
20d20℃wet-cured unconfined saturated compressive strength (MPa)
Standard axle times/d
250~625
60~250
The compressive strength of the main road base shall be greater than 2.0MPa, and the compressive strength of the main road subbase or secondary road base shall be 1.5~2.0MPa; the compressive strength of the secondary road subbase or general road base shall be 1.0~1.5MPa. All of the above are 28d20℃wet-cured saturated strength.
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Chapter 4 Implementation
Section 1 Preparation
Article 4.1.1 The roadbed quality of the newly built road shall comply with the current "Road Engineering Quality Inspection and Assessment Standard" CJJ1 and other relevant standards, and any discrepancies shall be handled. When paving an old road, the soil, debris and loose particles on the old road shall be cleaned up first. Dry areas need to be moistened with water. Local potholes should be repaired and compacted first. Article 4.1.2 The quality and specification of steel slag shall be inspected in advance, and after the roadbed is inspected and qualified, it shall be directly transported to the roadbed for paving, or it can be transported to the roadside for stacking in advance. Article 4.1.3 The various raw materials in the steel slag lime mixture shall be prepared in advance according to the progress of the project and the required quantity, and sampled and tested. Its specifications and quality shall comply with the relevant requirements of this regulation.
Two methods can be used: roadbed preparation or off-road centralized preparation. The former is used for roads that can block traffic; the latter is used for narrow sections of construction sites. Article 4.1.4 Wet fly ash should be transported to the site a few days before use to filter water and prevent rain or ash flying. Dry fly ash should be transported with appropriate amount of water before shipment or transported in a closed vehicle to avoid dust flying. Article 4.1.5 Lime should be dissolved 5 to 7 days before use. It is strictly forbidden to use it as soon as it is dissolved. When dissolving lime, pay attention to the amount of water used so that the lime can be fully dissolved and maintain a certain water content (can be 20 to 35%) to avoid excessive dryness and flying or excessive wetness and agglomeration (reference water consumption: 600 to 800 kg of water can be used to dissolve each ton of quicklime). For lime dissolving personnel, labor safety protection equipment should be available. Section 2: Batching
Article 4.2.1 Batching methods can be divided into three types:
a. Mass method - According to the total dry mass of the mixture mixed once and the moisture content of various materials, the wet weight of various materials is calculated, and then the materials are weighed and blended into a mixture according to the various wet weights.
b. Volume method - According to the mass ratio of the mixture, the volume ratio is converted into the volume ratio, and the volume occupied by various materials is measured with a container to blend into a mixture. c. Layer paving method - According to the maximum dry density of the mixture, the loose density and moisture content of various materials, and the compacted thickness of the mixture, the loose paving thickness of various materials is calculated to control the paving thickness. The layer paving method is suitable for mechanical road mixing. The calculation formulas for the amount of various materials in the three batching methods are shown in Appendix 3. According to the changes in moisture content, the amount of materials should be adjusted at any time. Section 3 Adding or removing water
Article 4.3.1 The amount of water added and the number of times of adding water during construction shall be determined by the local temperature and the moisture content of the materials during construction. The moisture content of the mixture after adding water shall be close to the optimum moisture content.
Article 4.3.2 Manual road mixing or mechanical factory mixing should use pressure nozzles. Mechanical road mixing can use a sprinkler truck or other watering tools to spray water evenly. Water can be added as the mixture is mixed, or water can be added once and the mixture can be kept for 8 to 12 hours before mixing. Article 4.3.3 If there is too much water in the mixture, it must be air-dried. The calculation formula for the amount of water added (or removed) is shown in Appendix 3. Section 4 Mixing
Article 4.4.1 Manual road mixing should use the strip mixing method, that is, after laying various materials in layers into strips, stir and move forward while turning. After stirring 2 to 3 times, sprinkle the water required to approach the optimum moisture content of the mixture evenly along the strips into the mixture, and then mix until the mixture is uniform.
Article 4.4.2 Mechanical road mixing should be spread in the order of steel slag, other materials and lime from bottom to top. It is advisable to use a tractor with a multi-plow type and a tractor with a rotary type or a disc, and the two machines should cooperate to mix crosswise. If there is uneven mixing or mixing in some places, it should be mixed manually.
Article 4.4.3 Mechanical factory mixing is carried out by appropriate mixers, crushers, belt conveyors and forklifts. During operation, lime and fly ash (soil) are first sent to the crusher by a belt conveyor in a certain proportion, crushed and mixed, and then sent to the mixer with a certain proportion of steel slag by a belt conveyor for mixing. In dry areas or dry and hot weather, the water content is slightly higher than the optimal water content during mixing, and then the mixed material is unloaded to the storage yard (or warehouse) for transportation. When transporting the mixture, if the coarse and fine materials are found to be segregated, they should be mixed evenly by a forklift before being transported to the construction site for paving. The mixture should be transported, spread and rolled as it is mixed. To prevent the mixture from hardening, the time from production to rolling should not exceed 7 days.
Article 4.4.4 There should be no soil, lime and fly ash aggregates larger than 25mm in the evenly mixed steel slag lime fly ash (soil) mixture. Section 5 Paving and Rolling
Article 4.5.1 The moisture content of the mixture during rolling should be the optimum moisture content. The allowable error is ±2%.
Article 4.5.2 The mixed mixture should be evenly spread on the roadbed according to the designed section and loose paving thickness. The loose paving thickness is the compaction thickness multiplied by the compaction coefficient. The compaction coefficient value should be determined by trial paving, or refer to the following range: 1.4~1.6 for manual mixing and manual paving; 1.2~1.5 for mechanical mixing and mechanical paving. Article 4.5.3 When paving in layers, the upper layer of the mixture should be spread immediately after the lower layer is compacted. Before paving the upper layer of the mixture, the surface of the lower layer should be moistened with water. Article 4.5.4 The compaction thickness of steel slag lime mixture should be determined by the compaction function of the roller. The maximum is 20cm, the minimum is 10cm, and the top layer is at least 15cm.
a. The mixture mixed by machinery and spread by machinery can be compacted directly with a 1215t three-wheel roller, tire roller or vibratory roller. b. For the mixture mixed and spread manually, the 6-8t (or 8-10t) two-wheel roller should be used to press the mixture twice from both sides to the middle of the road, and then compacted by a 1215t three-wheel roller. The two-wheel roller should overlap 1/3 of the wheel width each time, and the three-wheel roller should overlap 1/2 of the rear wheel width each time.
Engineering Construction Standard Full Text Information System
KANTKAca-0MPa; the compressive strength of the subbase of secondary trunk roads or general road base is 1.0～1.5MPa. All of the above are 28d20℃ wet saturated strength.
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Chapter 4 Implementation
Section 1 Preparatory Work
Article 4.1.1 The roadbed quality of the newly built road shall comply with the current "Road Engineering Quality Inspection and Assessment Standard" CJJ1 and other relevant standards, and any discrepancies shall be handled. When paving the old road, the soil, debris and loose particles on the old road shall be cleaned up first. Dry areas need to be moistened with water. Local potholes should be repaired and compacted first. Article 4.1.2 The quality and specification of steel slag shall be inspected in advance, and after the roadbed inspection is qualified, it shall be directly transported to the roadbed for paving, or it can be transported to the roadside for stacking in advance. Article 4.1.3 The various raw materials in the steel slag lime mixture shall be prepared in advance according to the progress of the project and the required quantity, and sampled and tested. The specifications and quality shall meet the relevant requirements of these regulations.
Two methods can be used: roadbed preparation or off-road centralized preparation. The former is used for roads that can block traffic; the latter is used for narrow sections of the construction site. Article 4.1.4 Wet fly ash should be transported to the site a few days before use to filter water, and prevent rain or ash flying. Dry fly ash should be transported with appropriate amount of water before shipment or transported in a closed vehicle to avoid ash flying. Article 4.1.5 Lime should be dissolved 5 to 7 days before use. It is strictly forbidden to use it as soon as it is dissolved. When dissolving lime, pay attention to the amount of water used to make the lime fully dissolved and maintain a certain water content (can be 20 to 35%) to avoid excessive dryness and flying or excessive wetness and agglomeration (reference water consumption: 600 to 800 kg of water can be used to dissolve each ton of quicklime). For the personnel who dissolve lime, labor safety protection equipment should be provided. Section 2 Batching
Article 4.2.1 Batching methods can be divided into three types:
a. Mass method - According to the total dry mass of the mixture mixed at one time and the water content of various materials, the wet weight of various materials is calculated, and then the materials are weighed and mixed into a mixture according to the various wet weights.
b. Volume method - According to the mass ratio of the mixture, the volume ratio is converted into the volume ratio, and the volume occupied by various materials is measured with a container to mix the mixture. c. Layer paving method - According to the maximum dry density of the mixture, the loose density and water content of various materials, and the compacted thickness of the mixture, the loose paving thickness of various materials is calculated to control the paving thickness. The layer paving method is suitable for mechanical road mixing. The calculation formulas for the amount of various materials in the three batching methods are shown in Appendix 3. According to the change of water content, the amount of materials should be adjusted at any time. Section 3 Adding or removing water
Article 4.3.1 The amount of water added and the number of times of adding water during construction shall be determined by the local temperature and the water content of the materials during construction. The water content of the mixture after adding water should be close to the optimal water content.
Article 4.3.2 Manual road mixing or mechanical factory mixing should use pressure nozzles. Mechanical road mixing can use sprinkler trucks or other sprinkler tools to spray water evenly. Water can be added as mixing progresses, or water can be added once and the material can be suffocated for 8 to 12 hours before mixing. Article 4.3.3 If there is too much water in the mixture, it must be air-dried. The calculation formula for the amount of water added (or removed) is shown in Appendix 3. Section 4 Mixing
Article 4.4.1 Manual road mixing should be done by strip mixing, that is, after laying various materials in layers into strips, stir and turn them while moving forward. After stirring 2 to 3 times, sprinkle the water required to reach the optimum moisture content of the mixture evenly along the strips, and then mix until the mixture is uniform.
Article 4.4.2 Mechanical road mixing should be spread in the order of steel slag, other materials, and lime from bottom to top. It is advisable to use a tractor with a multi-plow type and a tractor with a rotary or disc type, and the two machines should cooperate to stir and turn the mixture crosswise. If there is uneven mixing or mixing in some places, it should be supplemented by manual mixing.
Article 4.4.3 Mechanical factory mixing is carried out using appropriate mixers, crushers, belt conveyors, forklifts and other equipment. During operation, lime and fly ash (soil) are first sent to the crusher by a belt conveyor in a certain proportion, crushed and mixed, and then sent to the mixer with a certain proportion of steel slag by a belt conveyor for mixing. In dry areas or dry hot weather, mix evenly when the water content is slightly higher than the optimal water content, and then unload the evenly mixed mixture to the storage yard (or warehouse) for transportation. When transporting the mixture, if segregation of coarse and fine materials is found, it can be transported to the construction site for paving after being turned over and mixed evenly by a forklift. The mixture should be transported, spread and rolled as it is mixed. In order to prevent the mixture from hardening, the time from production to rolling should not exceed 7 days.
Article 4.4.4 There should be no soil, lime and fly ash aggregates larger than 25mm in the evenly mixed steel slag lime fly ash (soil) mixture. Section 5 Spreading and Rolling
Article 4.5.1 The water content of the mixture during rolling should be the optimum water content. The allowable error is ±2%.
Article 4.5.2 The mixed mixture shall be evenly spread on the roadbed according to the designed section and loose paving thickness. The loose paving thickness is the compaction thickness multiplied by the compaction coefficient. The compaction coefficient value should be determined by trial paving, or refer to the following range: 1.4~1.6 for manual mixing and manual paving; 1.2~1.5 for mechanical mixing and mechanical paving. Article 4.5.3 When paving in layers, the upper layer of the mixture shall be spread immediately after the lower layer is compacted. Before paving the upper layer of the mixture, the surface of the lower layer should be moistened with water. Article 4.5.4 The compaction thickness of steel slag lime mixture shall be determined by the compaction function of the roller. The maximum is 20cm, the minimum is 10cm, and the top layer is at least 15cm.
a. Mechanically mixed and mechanically spread mixtures can be compacted directly with 1215t three-wheel rollers, tire rollers or vibratory rollers. b. Manually mixed and manually spread mixtures should first be compacted twice with a 6-8t (or 8-10t) two-wheel roller from both sides to the middle of the road, and then compacted with a 1215t three-wheel roller. Two-wheel rollers overlap 1/3 of the wheel width each time, and three-wheel rollers overlap 1/2 of the rear wheel width each time.
Engineering Construction Standards Full-text Information System
KANTKAca-0MPa; the compressive strength of the subbase of secondary trunk roads or general road base is 1.0～1.5MPa. All of the above are 28d20℃ wet saturated strength.
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Chapter 4 Implementation
Section 1 Preparatory Work
Article 4.1.1 The roadbed quality of the newly built road shall comply with the current "Road Engineering Quality Inspection and Assessment Standard" CJJ1 and other relevant standards, and any discrepancies shall be handled. When paving the old road, the soil, debris and loose particles on the old road shall be cleaned up first. Dry areas need to be moistened with water. Local potholes should be repaired and compacted first. Article 4.1.2 The quality and specification of steel slag shall be inspected in advance, and after the roadbed inspection is qualified, it shall be directly transported to the roadbed for paving, or it can be transported to the roadside for stacking in advance. Article 4.1.3 The various raw materials in the steel slag lime mixture shall be prepared in advance according to the progress of the project and the required quantity, and sampled and tested. The specifications and quality shall meet the relevant requirements of these regulations.
Two methods can be used: roadbed preparation or off-road centralized preparation. The former is used for roads that can block traffic; the latter is used for narrow sections of the construction site. Article 4.1.4 Wet fly ash should be transported to the site a few days before use to filter water, and prevent rain or ash flying. Dry fly ash should be transported with appropriate amount of water before shipment or transported in a closed vehicle to avoid ash flying. Article 4.1.5 Lime should be dissolved 5 to 7 days before use. It is strictly forbidden to use it as soon as it is dissolved. When dissolving lime, pay attention to the amount of water used to make the lime fully dissolved and maintain a certain water content (can be 20 to 35%) to avoid excessive dryness and flying or excessive wetness and agglomeration (reference water consumption: 600 to 800 kg of water can be used to dissolve each ton of quicklime). For the personnel who dissolve lime, labor safety protection equipment should be provided. Section 2 Batching
Article 4.2.1 Batching methods can be divided into three types:
a. Mass method - According to the total dry mass of the mixture mixed at one time and the water content of various materials, the wet weight of various materials is calculated, and then the materials are weighed and mixed into a mixture according to the various wet weights.
b. Volume method - According to the mass ratio of the mixture, the volume ratio is converted into the volume ratio, and the volume occupied by various materials is measured with a container to mix the mixture. c. Layer paving method - According to the maximum dry density of the mixture, the loose density and water content of various materials, and the compacted thickness of the mixture, the loose paving thickness of various materials is calculated to control the paving thickness. The layer paving method is suitable for mechanical road mixing. The calculation formulas for the amount of various materials in the three batching methods are shown in Appendix 3. According to the change of water content, the amount of materials should be adjusted at any time. Section 3 Adding or removing water
Article 4.3.1 The amount of water added and the number of times of adding water during construction shall be determined by the local temperature and the water content of the materials during construction. The water content of the mixture after adding water should be close to the optimal water content.
Article 4.3.2 Manual road mixing or mechanical factory mixing should use pressure nozzles. Mechanical road mixing can use sprinkler trucks or other sprinkler tools to spray water evenly. Water can be added as mixing progresses, or water can be added once and the material can be suffocated for 8 to 12 hours before mixing. Article 4.3.3 If there is too much water in the mixture, it must be air-dried. The calculation formula for the amount of water added (or removed) is shown in Appendix 3. Section 4 Mixing
Article 4.4.1 Manual road mixing should be done by strip mixing, that is, after laying various materials in layers into strips, stir and turn them while moving forward. After stirring 2 to 3 times, sprinkle the water required to reach the optimum moisture content of the mixture evenly along the strips, and then mix until the mixture is uniform.
Article 4.4.2 Mechanical road mixing should be spread in the order of steel slag, other materials, and lime from bottom to top. It is advisable to use a tractor with a multi-plow type and a tractor with a rotary or disc type, and the two machines should cooperate to stir and turn the mixture crosswise. If there is uneven mixing or mixing in some places, it should be supplemented by manual mixing.
Article 4.4.3 Mechanical factory mixing is carried out using appropriate mixers, crushers, belt conveyors, forklifts and other equipment. During operation, lime and fly ash (soil) are first sent to the crusher by a belt conveyor in a certain proportion, crushed and mixed, and then sent to the mixer with a certain proportion of steel slag by a belt conveyor for mixing. In dry areas or dry hot weather, mix evenly when the water content is slightly higher than the optimal water content, and then unload the evenly mixed mixture to the storage yard (or warehouse) for transportation. When transporting the mixture, if segregation of coarse and fine materials is found, it can be transported to the construction site for paving after being turned over and mixed evenly by a forklift. The mixture should be transported, spread and rolled as it is mixed. In order to prevent the mixture from hardening, the time from production to rolling should not exceed 7 days.
Article 4.4.4 There should be no soil, lime and fly ash aggregates larger than 25mm in the evenly mixed steel slag lime fly ash (soil) mixture. Section 5 Spreading and Rolling
Article 4.5.1 The water content of the mixture during rolling should be the optimum water content. The allowable error is ±2%.
Article 4.5.2 The mixed mixture shall be evenly spread on the roadbed according to the designed section and loose paving thickness. The loose paving thickness is the compaction thickness multiplied by the compaction coefficient. The compaction coefficient value should be determined by trial paving, or refer to the following range: 1.4~1.6 for manual mixing and manual paving; 1.2~1.5 for mechanical mixing and mechanical paving. Article 4.5.3 When paving in layers, the upper layer of the mixture shall be spread immediately after the lower layer is compacted. Before paving the upper layer of the mixture, the surface of the lower layer should be moistened with water. Article 4.5.4 The compaction thickness of steel slag lime mixture shall be determined by the compaction function of the roller. The maximum is 20cm, the minimum is 10cm, and the top layer is at least 15cm.
a. Mechanically mixed and mechanically spread mixtures can be compacted directly with 1215t three-wheel rollers, tire rollers or vibratory rollers. b. Manually mixed and manually spread mixtures should first be compacted twice with a 6-8t (or 8-10t) two-wheel roller from both sides to the middle of the road, and then compacted with a 1215t three-wheel roller. Two-wheel rollers overlap 1/3 of the wheel width each time, and three-wheel rollers overlap 1/2 of the rear wheel width each time.
Engineering Construction Standards Full-text Information System
KANTKAca-Layer paving method 1: According to the maximum dry density of the mixture, the loose density and water content of various materials, and the compacted thickness of the mixture, the loose paving thickness of various materials is calculated to control the paving thickness. The layer paving method is suitable for mechanical road mixing. The calculation formulas for the amount of various materials in the three batching methods are shown in Appendix 3. According to the change of water content, the amount of materials should be adjusted at any time. Section 3 Adding or removing water
Article 4.3.1 The amount of water added and the number of times of adding water during construction shall depend on the local temperature and the water content of the materials during construction. The water content of the mixture after adding water should be close to the optimal water content. bZxz.net
Article 4.3.2 Manual road mixing or mechanical factory mixing should use pressure nozzles. Mechanical road mixing can use sprinkler trucks or other sprinkler tools to spray water evenly. Water can be added as mixing progresses, or water can be added once and the material can be suffocated for 8 to 12 hours before mixing. Article 4.3.3 If there is too much water in the mixture, it must be air-dried. The calculation formula for the amount of water added (or removed) is shown in Appendix 3. Section 4 Mixing
Article 4.4.1 Manual road mixing should be done by strip mixing, that is, after laying various materials in layers into strips, stir and turn them while moving forward. After stirring 2 to 3 times, sprinkle the water required to reach the optimum moisture content of the mixture evenly along the strips, and then mix until the mixture is uniform.
Article 4.4.2 Mechanical road mixing should be spread in the order of steel slag, other materials, and lime from bottom to top. It is advisable to use a tractor with a multi-plow type and a tractor with a rotary or disc type, and the two machines should cooperate to stir and turn the mixture crosswise. If there is uneven mixing or mixing in some places, it should be supplemented by manual mixing.
Article 4.4.3 Mechanical factory mixing is carried out using appropriate mixers, crushers, belt conveyors, forklifts and other equipment. During operation, lime and fly ash (soil) are first sent to the crusher by a belt conveyor in a certain proportion, crushed and mixed, and then sent to the mixer with a certain proportion of steel slag by a belt conveyor for mixing. In dry areas or dry hot weather, mix evenly when the water content is slightly higher than the optimal water content, and then unload the evenly mixed mixture to the storage yard (or warehouse) for transportation. When transporting the mixture, if segregation of coarse and fine materials is found, it can be transported to the construction site for paving after being turned over and mixed evenly by a forklift. The mixture should be transported, spread and rolled as it is mixed. In order to prevent the mixture from hardening, the time from production to rolling should not exceed 7 days.
Article 4.4.4 There should be no soil, lime and fly ash aggregates larger than 25mm in the evenly mixed steel slag lime fly ash (soil) mixture. Section 5 Spreading and Rolling
Article 4.5.1 The water content of the mixture during rolling should be the optimum water content. The allowable error is ±2%.
Article 4.5.2 The mixed mixture shall be evenly spread on the roadbed according to the designed section and loose paving thickness. The loose paving thickness is the compaction thickness multiplied by the compaction coefficient. The compaction coefficient value should be determined by trial paving, or refer to the following range: 1.4~1.6 for manual mixing and manual paving; 1.2~1.5 for mechanical mixing and mechanical paving. Article 4.5.3 When paving in layers, the upper layer of the mixture shall be spread immediately after the lower layer is compacted. Before paving the upper layer of the mixture, the surface of the lower layer should be moistened with water. Article 4.5.4 The compaction thickness of steel slag lime mixture shall be determined by the compaction function of the roller. The maximum is 20cm, the minimum is 10cm, and the top layer is at least 15cm.
a. Mechanically mixed and mechanically spread mixtures can be compacted directly with 1215t three-wheel rollers, tire rollers or vibratory rollers. b. Manually mixed and manually spread mixtures should first be compacted twice with a 6-8t (or 8-10t) two-wheel roller from both sides to the middle of the road, and then compacted with a 1215t three-wheel roller. Two-wheel rollers overlap 1/3 of the wheel width each time, and three-wheel rollers overlap 1/2 of the rear wheel width each time.
Engineering Construction Standards Full-text Information System
KANTKAca-Layer paving method 1: According to the maximum dry density of the mixture, the loose density and water content of various materials, and the compacted thickness of the mixture, the loose paving thickness of various materials is calculated to control the paving thickness. The layer paving method is suitable for mechanical road mixing. The calculation formulas for the amount of various materials in the three batching methods are shown in Appendix 3. According to the change of water content, the amount of materials should be adjusted at any time. Section 3 Adding or removing water
Article 4.3.1 The amount of water added and the number of times of adding water during construction shall depend on the local temperature and the water content of the materials during construction. The water content of the mixture after adding water should be close to the optimal water content.
Article 4.3.2 Manual road mixing or mechanical factory mixing should use pressure nozzles. Mechanical road mixing can use sprinkler trucks or other sprinkler tools to spray water evenly. Water can be added as mixing progresses, or water can be added once and the material can be suffocated for 8 to 12 hours before mixing. Article 4.3.3 If there is too much water in the mixture, it must be air-dried. The calculation formula for the amount of water added (or removed) is shown in Appendix 3. Section 4 Mixing
Article 4.4.1 Manual road mixing should be done by strip mixing, that is, after laying various materials in layers into strips, stir and turn them while moving forward. After stirring 2 to 3 times, sprinkle the water required to reach the optimum moisture content of the mixture evenly along the strips, and then mix until the mixture is uniform.
Article 4.4.2 Mechanical road mixing should be spread in the order of steel slag, other materials, and lime from bottom to top. It is advisable to use a tractor with a multi-plow type and a tractor with a rotary or disc type, and the two machines should cooperate to stir and turn the mixture crosswise. If there is uneven mixing or mixing in some places, it should be supplemented by manual mixing.
Article 4.4.3 Mechanical factory mixing is carried out using appropriate mixers, crushers, belt conveyors, forklifts and other equipment. During operation, lime and fly ash (soil) are first sent to the crusher by a belt conveyor in a certain proportion, crushed and mixed, and then sent to the mixer with a certain proportion of steel slag by a belt conveyor for mixing. In dry areas or dry hot weather, mix evenly when the water content is slightly higher than the optimal water content, and then unload the evenly mixed mixture to the storage yard (or warehouse) for transportation. When transporting the mixture, if segregation of coarse and fine materials is found, it can be transported to the construction site for paving after being turned over and mixed evenly by a forklift. The mixture should be transported, spread and rolled as it is mixed. In order to prevent the mixture from hardening, the time from production to rolling should not exceed 7 days.
Article 4.4.4 There should be no soil, lime and fly ash aggregates larger than 25mm in the evenly mixed steel slag lime fly ash (soil) mixture. Section 5 Spreading and Rolling
Article 4.5.1 The water content of the mixture during rolling should be the optimum water content. The allowable error is ±2%.
Article 4.5.2 The mixed mixture shall be evenly spread on the roadbed according to the designed section and loose paving thickness. The loose paving thickness is the compaction thickness multiplied by the compaction coefficient. The compaction coefficient value should be determined by trial paving, or refer to the following range: 1.4~1.6 for manual mixing and manual paving; 1.2~1.5 for mechanical mixing and mechanical paving. Article 4.5.3 When paving in layers, the upper layer of the mixture shall be spread immediately after the lower layer is compacted. Before paving the upper layer of the mixture, the surface of the lower layer should be moistened with water. Article 4.5.4 The compaction thickness of steel slag lime mixture shall be determined by the compaction function of the roller. The maximum is 20cm, the minimum is 10cm, and the top layer is at least 15cm.
a. Mechanically mixed and mechanically spread mixtures can be compacted directly with 1215t three-wheel rollers, tire rollers or vibratory rollers. b. Manually mixed and manually spread mixtures should first be compacted twice with a 6-8t (or 8-10t) two-wheel roller from both sides to the middle of the road, and then compacted with a 1215t three-wheel roller. Two-wheel rollers overlap 1/3 of the wheel width each time, and three-wheel rollers overlap 1/2 of the rear wheel width each time.
Engineering Construction Standards Full-text Information System
KANTKAca-
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.