CJJ/T 80-1998 Technical specification for base and subbase of solidified pavement
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Engineering Construction Standard Full-text Information System
Industry Standard of the People's Republic of China
Technical Specification of Roadbases and Subbases with Chemical Stabilization
CJJ/T80—98
1998 Beijing
Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Industry Standard of the People's Republic of China
Technical Specification of Roadbases and Subbases with Chemical Stabilization Stabilization
CJJ/T80—98
Editor: Beijing Municipal Engineering Design and Research InstituteApproval: Ministry of Construction of the People's Republic of ChinaEffective date: December 1, 1998
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Notice on the release of the industry standard "Technical Specifications for Solidified Pavement Base and Subbase"
Construction Standards [1998] No. 135
Construction committees (construction departments) of provinces, autonomous regions, and municipalities directly under the Central Government, construction committees of cities with independent planning status, Xinjiang Production and Construction Corps, and relevant departments of the State Council: In accordance with the requirements of the Ministry of Construction's "Notice on Issuing the 1995 Urban Construction and Construction Engineering Industry Standard Formulation and Revision Project Plan (First Batch)" (Jianbiao [1995] No. 175), the "Technical Specifications for Solidified Pavement Base and Subbase" edited by Beijing Municipal Engineering Design and Research Institute has been reviewed and approved as a recommended industry standard, numbered CJJ/T80-98, and will be implemented from December 1, 1998. This standard is managed and specifically interpreted by Beijing Municipal Engineering Design and Research Institute, the technical unit responsible for urban road and bridge standards of the Ministry of Construction. This standard is published by China Building Industry Press organized by the Standard and Quota Research Institute of the Ministry of Construction.
Ministry of Construction of the People's Republic of China
June 23, 1998
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According to the requirements of the Ministry of Construction's Document No. 175 [1995], the Standard Compilation Group has formulated this regulation after extensive investigation and research, careful summary of practical experience, reference to relevant international standards and foreign advanced standards, and extensive solicitation of opinions. The main technical contents of this regulation are: General Principles: Selection and technical requirements of raw materials for solidifying mixtures: Composition and mix ratio design of solidifying mixtures: Structural design of solidifying pavement base and subbase, construction of solidifying pavement base and subbase, quality requirements and inspection and acceptance.
This code is managed by the Beijing Municipal Engineering Design and Research Institute, the technical unit responsible for urban road and bridge standards under the Ministry of Construction, and is responsible for specific interpretation work. The main editor of this code is: Beijing Municipal Engineering Design and Research Institute (Address: No. 2, Yuetan South Street, Xicheng District, Beijing; Postal Code: 100045). The participating units of this code are: Dalian McWen Road Engineering Co., Ltd., Dalian University of Technology, Jiangsu Xingxing Engineering Construction Supervision Company, and Xi'an Municipal Engineering Management Office.
The main drafters of this code are: Liu Xiangrong, Yang Shuqi
Shi Ding Congyi
Cao Yongmin, Wang Ruxian
Zhu Zicheng
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2 Selection and technical requirements of raw materials for solidifying mixtures. 2.1 Soil solidifier
2.2 Cement, lime
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2.4 Water..........
3 Composition and mix design of solidifying mixtures 3.1
General provisions
3.2 Tests on raw materials
3.3 Mix design of solidifying mixtures
Structural design of base and subbase of solidifying pavement Construction of base and subbase of solidifying pavement
Construction by road-mixing method
Construction by factory-mixing method||tt ||Construction organization and division of work sections
Quality requirements and inspection and acceptance
General provisions
Material testing
Quality requirements
Inspection and acceptance
Appendix A
Appendix B
Test method for unconfined compressive strength of solidified mixturesCommonly used solidified pavement base and subbase structure combinationsExplanation of terms used in this code
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1.0.1 This code is formulated to unify the design and construction of solidified pavement base and subbase and ensure the engineering quality of solidified pavement base and subbase. 1.0.2 This code is applicable to the design, construction and acceptance of solidified pavement base and subbase for newly built and rebuilt urban roads of all levels. 1.0.3In addition to complying with this code, the design and construction of solidified pavement base and subbase shall also comply with the provisions of the current relevant national standards and specifications. Engineering Construction Standard Full Text Information System
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2 Selection and Technical Requirements of Raw Materials for Solidified Mixtures2.1 Soil Solidifier
1 Soil solidifiers can be divided into two categories: liquid-powder soil solidifiers and powdered soil solidifiers.
2 The technical performance indicators of soil solidifiers shall comply with the provisions of the current industry standard "Soil Solidifiers" CJ/T3073.
2.1.3 The solid content of the solution in the liquid-powder soil solidifier shall not be greater than 3%, and there shall be no precipitation or flocculent phenomenon. The fineness of the powdered soil solidifier shall not exceed 15% on the 0.074mm standard sieve.
2.2 Cement, lime
1 Ordinary Portland cement, slag Portland cement, and pozzolanic Portland cement can all be used to solidify the pavement base and subbase. However, the cement grade shall not be lower than 325, and cement with a final setting time equal to or greater than 6h shall be selected. 2.2.2 Rapid hardening cement, early strength cement and cement that has deteriorated and expired due to moisture shall not be used for curing the base and subbase of the road surface.
2.2.3 Lime shall be slaked lime or quicklime powder; slaked lime shall not contain undissolved quicklime particles.
2.2.4 The grade of lime shall comply with the provisions of the current industry standard "Construction Quicklime" JC479.
2.3.1 Any soil that can be crushed or was originally loose can be used as the base material of the curing mixture.
The maximum particle size of the stone in the soil: base, should not be greater than 30mm; subbase, should not be greater than 40mm.
The crushing value of the stone in the soil for the base and subbase shall not be greater than 40%. 2.3.3
The organic matter content (weight ratio) in the soil should not exceed 10%. 2.3.4
5The soil testing method should comply with the provisions of the current national standard "Standard for Geotechnical Test Methods" GBJ123.
1All drinking water for humans or livestock can be used. The water used for the base and subbase should be water with a pH value greater than or equal to 6.
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3 Composition and mix ratio design of solidifying mixtures 3.1 General provisions
The type of main soil solidifying agent selected should be determined according to the type and properties of the soil, and then the most suitable cementing material and dosage should be selected through mix ratio design tests.
Determine.
The mix ratio of solidifying mixtures should be weight ratio. The mix design of solidifying mixtures shall be based on the strength standard of solidifying mixtures. The test methods of various aggregates in solidifying mixtures can be carried out according to the current industry standard "Testing Procedures for Stabilized Materials of Inorganic Binders for Highway Engineering" JTJ057. 3.2 Testing of Raw Materials
For soil used in solidifying mixtures, representative samples should be taken to conduct the following test particle analysis;
Liquid limit and plasticity index;
Organic matter content;
Water content;
5pH value;
6Crushing value test.
For cement, its grade, initial and final setting time and stability should be determined. 3.2.3
For lime, the content of effective calcium and magnesium oxide should be determined. 3.3.3.1 The curing mixture should be prepared according to the following proportions. Engineering Construction Standard Full-text Information System
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1 Pavement Base
1) When using liquid-powder soil stabilizer
a. When the mixture is a cement mixture, the cement accounts for 3% to 6% of the dry soil weight: the liquid-powder soil stabilizer aqueous solution accounts for 0.3% to 1.0% of the dry soil weight; 6. When the mixture is a lime mixture, the lime accounts for 6% to 10% of the dry weight: the liquid-powder soil stabilizer aqueous solution accounts for 0.3% to 1.0% of the dry soil weight; c. When the mixture is a cement and lime mixture, the cement accounts for 2% to 4% of the dry soil weight, the lime accounts for 4% of the dry soil weight, and the liquid-powder soil stabilizer aqueous solution accounts for 0.3% to 1.0% of the dry soil weight;
2) When using powdered soil stabilizer
The powdered soil stabilizer accounts for 5% to 10% of the dry soil weight. 2 Pavement subbase
1) When using liquid powder soil stabilizer
a. When the mixture is cement, the cement accounts for 2%3% of the dry weight. The liquid powder soil stabilizer aqueous solution accounts for 0.3%~0.5% of the dry soil weight. 6. When the mixture is lime, the lime accounts for 4%~5% of the dry soil weight; the liquid powder soil stabilizer aqueous solution accounts for 0.3%~0.5% of the dry soil weight. c. When the mixture is cement and lime, the cement accounts for 1%~3% of the dry soil weight; the lime accounts for 3%~5% of the dry soil weight; the liquid powder soil stabilizer aqueous solution accounts for 0.3%~0.5% of the dry soil weight.
2) When using powdered soil stabilizer
The powdered soil stabilizer accounts for 5%8% of the dry soil weight. 3.3.2 The optimal moisture content and maximum dry density of the solidified mixture should be determined through compaction tests.
3.3.3 For roads of different traffic categories, the compressive strength of solidified mixed materials after 7 days shall comply with the provisions of Table 3.3.3.
3.3.4 The compressive strength test specimens shall be kept moisturized for 6 days at 20±2℃, then immersed in water for 1 day, taken out for unconfined compressive strength test, and the average value of no less than 6 specimens shall be taken. The unconfined compressive strength test method of solidified mixtures shall comply with the provisions of Appendix A of this specification.
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Strength standard of solidified mixture (Mpa) Layer
Solidifier category
Cement
Lime
Cement lime
Lime fly ash
Powdered solidifier
Cement
Lime
Cement lime
Lime fly ash
Powdered solidifier
Urban expressways and urban trunk roads
Urban secondary roads and branch roads
Note: For the strength standard of cement-lime mixture, when cement is the main component, its strength standard is the same as that of cement mixture; when lime is the main component, its strength standard is the same as that of lime mixture; when the amount of lime and cement is similar, the average value of cement and lime is taken. 3.3.5
The amount of cement, lime or soil stabilizer actually used on the construction site should be higher than the amount determined by the indoor test: when using liquid powder soil stabilizer, cement should be increased by 0.5%~1% of the dry soil weight; lime should be increased by 1%~2% of the dry soil weight; liquid powder soil stabilizer aqueous solution should be increased by 0.1%~0.2% of the dry soil weight; when using powdered soil stabilizer, powdered soil stabilizer should be increased by 1%~2% of the dry soil weight, of which the factory mixing method uses the lower value and the road mixing method uses the higher value. Engineering 6 Construction Standard Full Text Information System
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4 Design of the base and subbase structure of the solidified pavement 4.0.1 The design of the base and subbase structure of the solidified pavement shall comply with the relevant provisions of the current industry standard "Urban Road Design Code" CJJ37. 4.0.2 When using the base and subbase of the solidified pavement, a technical and economic comparison should be carried out to determine the selected pavement structure plan.
3 The base and subbase of the solidified road surface shall meet the following requirements: 4.0.3
1 The strength and stability requirements shall be met;
2 The strength of the solidified mixture shall be uniform; 3
The mix design of the solidified mixture shall meet the strength requirements of Table 3.3.3.
The design parameters of the base and subbase materials of the solidified road surface shall be determined in combination with the actual conditions of each place. The test method for flexible pavement can be carried out in accordance with the current industry standard "Standard for Determination of Design Parameters of Flexible Pavement CJ/T59" The test method for rigid pavement can be carried out in accordance with the test method for flexible pavement. 4.0.5 The base and subbase structure of the solidified road surface has semi-rigid characteristics, and its thickness should not be less than 15cm.
4.0.6 The material rebound modulus of each structural layer should decrease from top to bottom. 4.0.7
The asphalt surface layer should be tightly bonded with the base and subbase layers of the solidified road surface, and a penetration layer of asphalt should be sprayed, the dosage of which should be 0.8~1.0kg/m2.4.0.8 The base of urban expressways and trunk roads should use coarse-grained soil such as gravel or crushed stone. Cement and lime soil stabilizers should not be used to stabilize fine-grained soil mixtures, but they can be used for the subbase.
For roads with heavy traffic, a connecting layer should be added between the surface layer and the solidified mixture base. www.bzxz.net
The commonly used solidified road base and subbase structure combination should comply with the provisions of Appendix B and should be used after demonstration.
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The amount of cement, lime or soil stabilizer actually used on the construction site should be higher than the amount determined by the indoor test: when using liquid powder soil stabilizer, cement should be increased by 0.5%~1% of the dry soil weight; lime should be increased by 1%~2% of the dry soil weight; liquid powder soil stabilizer aqueous solution should be increased by 0.1%~0.2% of the dry soil weight; when using powdered soil stabilizer, powdered soil stabilizer should be increased by 1%~2% of the dry soil weight, of which the factory mixing method uses the lower value and the road mixing method uses the higher value. Engineering 6 Construction Standard Full Text Information System
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4 Design of the base and subbase structure of the solidified pavement 4.0.1 The design of the base and subbase structure of the solidified pavement shall comply with the relevant provisions of the current industry standard "Urban Road Design Code" CJJ37. 4.0.2 When using the base and subbase of the solidified pavement, a technical and economic comparison should be carried out to determine the selected pavement structure plan.
3 The base and subbase of the solidified road surface shall meet the following requirements: 4.0.3
1 The strength and stability requirements shall be met;
2 The strength of the solidified mixture shall be uniform; 3
The mix design of the solidified mixture shall meet the strength requirements of Table 3.3.3.
The design parameters of the base and subbase materials of the solidified road surface shall be determined in combination with the actual conditions of each place. The test method for flexible pavement can be carried out in accordance with the current industry standard "Standard for Determination of Design Parameters of Flexible Pavement CJ/T59" The test method for rigid pavement can be carried out in accordance with the test method for flexible pavement. 4.0.5 The base and subbase structure of the solidified road surface has semi-rigid characteristics, and its thickness should not be less than 15cm.
4.0.6 The material rebound modulus of each structural layer should decrease from top to bottom. 4.0.7
The asphalt surface layer should be tightly bonded with the base and subbase layers of the solidified road surface, and a penetration layer of asphalt should be sprayed, the dosage of which should be 0.8~1.0kg/m2.4.0.8 The base of urban expressways and trunk roads should use coarse-grained soil such as gravel or crushed stone. Cement and lime soil stabilizers should not be used to stabilize fine-grained soil mixtures, but they can be used for the subbase.
For roads with heavy traffic, a connecting layer should be added between the surface layer and the solidified mixture base.
The commonly used solidified road base and subbase structure combination should comply with the provisions of Appendix B and should be used after demonstration.
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The amount of cement, lime or soil stabilizer actually used on the construction site should be higher than the amount determined by the indoor test: when using liquid powder soil stabilizer, cement should be increased by 0.5%~1% of the dry soil weight; lime should be increased by 1%~2% of the dry soil weight; liquid powder soil stabilizer aqueous solution should be increased by 0.1%~0.2% of the dry soil weight; when using powdered soil stabilizer, powdered soil stabilizer should be increased by 1%~2% of the dry soil weight, of which the factory mixing method uses the lower value and the road mixing method uses the higher value. Engineering 6 Construction Standard Full Text Information System
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4 Design of the base and subbase structure of the solidified pavement 4.0.1 The design of the base and subbase structure of the solidified pavement shall comply with the relevant provisions of the current industry standard "Urban Road Design Code" CJJ37. 4.0.2 When using the base and subbase of the solidified pavement, a technical and economic comparison should be carried out to determine the selected pavement structure plan.
3 The base and subbase of the solidified road surface shall meet the following requirements: 4.0.3
1 The strength and stability requirements shall be met;
2 The strength of the solidified mixture shall be uniform; 3
The mix design of the solidified mixture shall meet the strength requirements of Table 3.3.3.
The design parameters of the base and subbase materials of the solidified road surface shall be determined in combination with the actual conditions of each place. The test method for flexible pavement can be carried out in accordance with the current industry standard "Standard for Determination of Design Parameters of Flexible Pavement CJ/T59" The test method for rigid pavement can be carried out in accordance with the test method for flexible pavement. 4.0.5 The base and subbase structure of the solidified road surface has semi-rigid characteristics, and its thickness should not be less than 15cm.
4.0.6 The material rebound modulus of each structural layer should decrease from top to bottom. 4.0.7
The asphalt surface layer should be tightly bonded with the base and subbase layers of the solidified road surface, and a penetration layer of asphalt should be sprayed, the dosage of which should be 0.8~1.0kg/m2.4.0.8 The base of urban expressways and trunk roads should use coarse-grained soil such as gravel or crushed stone. Cement and lime soil stabilizers should not be used to stabilize fine-grained soil mixtures, but they can be used for the subbase.
For roads with heavy traffic, a connecting layer should be added between the surface layer and the solidified mixture base.
The commonly used solidified road base and subbase structure combination should comply with the provisions of Appendix B and should be used after demonstration.
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