GBJ 80-1985 Test methods for properties of ordinary concrete mixtures GBJ80-85
Some standard content:
Engineering Construction Standard Full-text Information System
National Standard of the People's Republic of China
Ordinary Concrete Mixture
Performance Test Method
GBJ80—85
1985 Beijing
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National Standard of the People's Republic of China
Performance Test Method of Ordinary Concrete Mixture180—85
Editor Department: Ministry of Urban and Rural Construction and Environmental Protection Approval Department: National Planning Commission of the People's Republic of China Committee implementation date: July 1, 1986
Engineering Construction Standards Full Text Information System
Engineering Construction Standards Full Text Information System
Notice on the release of three national standards including "Test Methods for Performance of Ordinary Concrete Mixtures"
Standardization [1985] No. 1889
According to the requirements of the former National Construction Committee (78) Jianfa Shezi No. 562, the three standards including "Test Methods for Performance of Ordinary Concrete Mixtures" jointly compiled by the China Academy of Building Research of the Ministry of Urban and Rural Construction and relevant units have been reviewed by relevant departments. The three standards including "Test Methods for Performance of Ordinary Concrete Mixtures" GBJ80-85, "Test Methods for Mechanical Properties of Ordinary Concrete" GBJ81-85 and "Test Methods for Long-term Performance and Durability of Ordinary Concrete" GBJ82-85 are now approved as national standards and will be implemented from July 1, 1986.
The three standards are managed by the Ministry of Urban and Rural Construction, and the specific interpretation and other work is the responsibility of the China Academy of Building Research. The publication and distribution is organized by the Institute of Basic Construction Standards and Norms of our Commission.
State Planning Commission
November 25, 1985
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Preparation Instructions
This standard is prepared by the China Academy of Building Research in conjunction with relevant units in accordance with the requirements of the Notice No. 562 of the former State Construction Commission (78) Jianfashe. During the preparation process, a large amount of investigation, research and experimental demonstration work was carried out, and international standards and other relevant domestic and foreign specifications and standards were collected and referenced. After repeated discussions and revisions, the standard was formed. During the preparation process, the opinions of relevant units across the country were solicited many times, and finally it was reviewed and finalized with relevant departments.
This standard is the test method for the performance of the mixture in the basic properties of ordinary concrete. The content includes six methods, including slump, Vebe consistency, bulk density, air content test by air pressure method, air content test by water pressure method and water-cement ratio analysis. Since the performance test of common concrete mixtures covers a wide range, the text itself will continue to develop with the improvement of instruments and equipment and the improvement of testing technology. Therefore, it is hoped that all units will pay attention to accumulating data and summarizing experience in the process of implementing this standard. If there is a need for modification or supplement, please send your opinions and relevant information to the Concrete Research Institute of China Academy of Building Research for reference in future modifications.
Ministry of Urban and Rural Construction and Environmental Protection
July 1985
Engineering Construction Standards Full Text Information System
Engineering Construction Standards Full Text Information System
Chapter 1
Chapter 2
Chapter 3
Mixture Sampling and Sample Preparation
Consistency Test
Section 1 Falling Degree Method
Section 2 Vebe Consistency Method
Chapter 4
Mixture Bulk Density Test.
Chapter 5 Mixture Air Content Test…||tt| |Section 1 Air Pressure Method
Section 2 Water Pressure Method·
Chapter 6
Analysis of Water-Cement Ratio in Concrete Mixture
Terms Used in This Code
Additional Explanations
Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Chapter 1
Article 1.0.1 This standard is formulated to provide a unified concrete mixture performance test method when determining the concrete performance characteristic value, inspecting or controlling the quality of cast-in-place concrete engineering or prefabricated components. Article 1.0.2 This standard applies to the basic performance test of ordinary concrete mixtures used in industrial and civil buildings and general structures. Engineering Construction Standard Full Text Information System
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Chapter 2 Mixture Sampling and Sample Preparation
Article 2.0.1 The materials for concrete mixture testing should be taken from the same pan of concrete or the same truck according to different requirements, or mixed separately in the laboratory by machine or manually.
Article 2.0.2
When sampling for concrete testing during concrete engineering construction, the sampling method and principles should be implemented in accordance with the current "Construction and Acceptance Code for Reinforced Concrete Engineering" and other relevant regulations.
Article 2.0.3 When mixing concrete in the laboratory for testing, the aggregates used for mixing should be transported into the room in advance. The temperature of the laboratory should be maintained at 20±5℃ during mixing. Note: When it is necessary to simulate the concrete used under construction conditions, the temperature of the raw materials in the laboratory should be kept consistent with that of the construction site.
Article 2.0.4 When mixing concrete in the laboratory, the amount of materials is measured by weight, and the weighing accuracy is: ±1% for aggregate, ±0.5% for water, cement and admixture. Article 2.0.5 The mixture should be tested as soon as possible after sampling. Before the test, the sample should be slightly turned over by hand to ensure its uniform quality. Engineering 2 Construction Standard Full Text Information System
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Chapter 3 Consistency Test
Section 1 Fall Method
Article 3.1.1 This method is applicable to the determination of the consistency of concrete mixtures with a maximum aggregate size of not more than 40 mm and a fall value of not less than 10 mm. Article 3.1.2 The equipment used for the fall test shall comply with the following provisions. 1. The fall cylinder is a truncated cone made of thin steel plate or other metal (see Figure 3.1.2). Its inner wall should be smooth and have no concave
convex parts. The bottom and top surfaces should be parallel to each other and perpendicular to the axis of the cone. Two handles should be installed at two-thirds of the height outside the drop tube, and a foot pedal should be welded at the lower end. The internal dimensions of the tube are. Bottom diameter 200 ± 2 mm Top diameter 100 ± 2 mm Degree 300 ± 2 mm Thickness of tube wall not less than 1.5 mm 2. The tamping rod is a steel rod with a diameter of 16 mm and a length of 600 mm. The ends should be rounded. Figure 3.1.2 Drop tube Section 3.1.3. The slump test should be carried out according to the following steps: 1. Wet the slump cylinder and other tools, and place the cylinder on a rigid horizontal bottom plate that does not absorb water, then step on the pedals on both sides to keep the slump cylinder in a fixed position during loading.
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2. Use a small shovel to evenly load the concrete samples obtained as required into the cylinder in three layers, so that the height of each layer after compaction is about one-third of the height of the cylinder. Use a tamping rod to smear 25 times for each layer. The smearing should be carried out from the outside to the center along the spiral direction, and each smearing should be evenly distributed on the cross section. When tamping the concrete at the edge of the cylinder, the tamping rod can be slightly tilted. When tamping the bottom layer, the tamping rod should penetrate the entire depth. When tamping the second and top layers, the tamping rod should penetrate the current layer to the surface of the next layer.
When pouring the top layer, the concrete should be poured to a height above the cylinder mouth. During the ramming process, if the concrete sinks below the barrel mouth, it should be added at any time. After the top layer is rammed, scrape off the excess concrete and smooth it with a spatula.
3. After removing the concrete on the bottom plate of the cylinder, lift the drop cylinder vertically and smoothly. The lifting process of the drop cylinder should be completed within 5 to 10 seconds. The entire process from the beginning of loading to the lifting of the drop cylinder should be carried out uninterruptedly and should be completed within 150 seconds.
4. After lifting the drop cylinder, measure the height difference between the cylinder height and the highest point of the fallen concrete specimen, which is the fall value of the concrete mixture. After the fall cylinder is lifted, if the concrete collapses or one side is sheared, re-sample it for another measurement. If the above phenomenon still occurs in the second test, it means that the workability of the concrete is not good and should be recorded for reference. 5. Observe the cohesion and water retention of the fallen concrete specimen. The method of checking cohesion is to gently tap the side of the fallen concrete cone with a tamping rod. At this time, if the cone gradually sinks, it means that the cohesion is good. If the cone collapses, partially breaks or segregates, it means that the cohesion is not good. Water retention is evaluated by the degree of slurry precipitation in the concrete mixture. If more slurry precipitates from the bottom after the drop cylinder is lifted, and the aggregate is exposed due to the loss of slurry in the cone part, it means that the water retention performance of this concrete mixture is not good. If no slurry or only a small amount of slurry precipitates from the bottom after the drop cylinder is lifted, it means that the water retention of this concrete mixture is good.
Article 3.1.4 The slump of the concrete mixture is in millimeters, and the result is expressed accurately to 5 mm.
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Section 2 Vebe Consistency Method
Article 3.2.1 This method is applicable to the determination of the consistency of concrete mixtures with a maximum aggregate size of no more than 40 mm and a Vebe consistency of 5 to 30 seconds. Article 3.2.2 The equipment used for the Vebe consistency test shall comply with the following provisions 1. The Vebe consistency meter (see Figure 3.2.2) consists of the following parts. 1. The vibration table is 380 mm long and 260 mm wide, supported on four shock absorbers. A vibrator with a frequency of 50 ± 3 Hz is installed at the bottom of the table. When an empty container is installed, the amplitude of the table should be 0.5 ± 0.1 mm.
2. The container is made of steel plate, with an inner diameter of 240 ± 5 mm, a height of 200 ± 2 mm, a cylinder wall thickness of 3 mm, and a cylinder bottom thickness of 7.5 mm. Figure 3.2.2 Vebe consistency meter
A—Container
D—Feeding hopper
G—Vibration table
M—A support
Q—Screw for measuring rod
B—Fall cylinder
E—A sleeve
H—Fixing screw
N—Rotating stand
C—Transparent disc
F—Locking screw bzxz.net
J—Measuring rod
P-load block
3. Drop cylinder
The internal dimensions are:
Bottom diameter 200±2 mm
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Top diameter 100±2 mm
Height 300±2 mm
4. The rotating frame is connected to the measuring rod and the feeding hopper. A transparent and horizontal disc is installed at the bottom of the measuring rod, and the measuring rod is fixed in the sleeve with the measuring rod screw. The rotating frame is installed on the pillar, the direction is fixed by the cross groove, and its position is fixed by the positioning screw. After being in place, the axis of the measuring rod or the feeding hopper should coincide with the axis of the container. The diameter of the transparent disc is 230±2 mm and the thickness is 10±2 mm. The load block is directly fixed on the disc. The total weight of the sliding part consisting of the measuring rod, the disc and the load block should be 2750 ± 50 grams.
2. The end of the steel rod with a diameter of 16 mm and a length of 600 mm should be rounded. Article 3.2.3 The Vebe consistency test should be carried out according to the following steps: 1. Place the Vebe consistency meter on a solid and horizontal ground, and wet the container, the fall cylinder, the inner wall of the feeding hopper and other tools with a wet cloth. 2. Lift the feeding hopper to the fall cylinder and tighten it, correct the position of the container so that its center coincides with the center of the feeding hopper, and then tighten the fixing screws. 3. Use a small shovel to evenly load the concrete sample obtained as required into the cylinder in three layers through the feeding hopper. The loading and insertion methods should comply with the provisions of the second paragraph of Article 3.1.3.
4. Turn the feeding hopper away and lift the fall cylinder vertically. At this time, care should be taken not to cause lateral twisting of the concrete specimen. 5. Turn the transparent disc to the top of the concrete table, loosen the screw of the measuring rod, and lower the disc so that it touches the top of the concrete lightly. 6. Tighten the positioning screw and check whether the screw of the measuring rod has been completely loosened. 7. Use a stopwatch to time the vibration. When the bottom of the transparent disc is covered with cement slurry, stop the timer and turn off the vibration table. Article 3.2.4 The time (seconds) read by the stopwatch is the Vebe consistency value of the concrete mixture.
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Chapter 4 Mixture Bulk Density Test
Article 4.0.1 This method is applicable to the determination of the unit volume weight of the concrete mixture after it is exposed.
Article 4.0.2 The equipment used for the mixture bulk density test shall comply with the following provisions 1. Volume cylinder A cylinder made of metal with handles on both sides. For the mixture with the maximum aggregate size not exceeding 40 mm, a 5-liter capacity cylinder is used, whose inner diameter and cylinder height are both 186 ± 2 mm, and the cylinder wall thickness is 3 mm. When the maximum aggregate size is greater than 40 mm, the inner diameter and cylinder height of the capacity cylinder should be greater than 4 times the maximum aggregate size. The upper edge and inner wall of the capacity cylinder should be smooth and flat, and the top and bottom surfaces should be parallel and perpendicular to the axis of the cylinder.
2. The platform scale weighs 100 kg and the sensitivity is 50 grams. 2. The frequency of the vibration table should be 50 ± 3 Hz, and the amplitude when unloaded should be 0.5 ± 0.1 mm.
4. The tamping rod is a steel rod with a diameter of 16 mm and a length of 600 mm, and the end should be rounded. Article 4.0.3 The bulk density test of the mixture should be carried out according to the following steps: Wipe the inside and outside of the capacity cylinder with a wet cloth, and weigh the cylinder weight to an accuracy of 50 grams. 2. The loading and unpacking method of the concrete main should be determined according to the consistency of the mixture. For concrete with a fall of no more than 70 mm, it is appropriate to use a vibrating table to compact it, and for concrete with a fall of more than 70 mm, it is appropriate to use a tamping rod to compact it.
When using a tamping rod to compact, the layering and number of tamping times should be determined according to the size of the capacity cylinder. When using a 5-liter capacity cylinder, the concrete mixture should be loaded in two layers, and the number of tamping times for each layer should be 25 times. When using a capacity cylinder larger than 5 liters, the height of each layer of concrete should not be greater than 100 mm, and the number of tamping times for each layer should be calculated as no less than 12 times per 100 square centimeters of cross-section. Each tamping should be evenly distributed on the cross-section of each layer. When tamping the bottom layer, the tamping rod should penetrate the entire depth. When tamping the second layer, the tamping rod should penetrate the current layer to the surface of the next layer. Per Engineering Construction Standard Full-text Information System
W.bzsosO.coI2 Veber consistency meter
A-container
D-feeding hopper
G-vibration table
M-a holder
Q-screw of measuring rod
B-fall cylinder
E-a sleeve
H-fixing screw
N-rotating frame
C-transparent disc
F-positioning screw
J-measuring rod|| tt||P-load block
3. Drop cylinder
The internal dimensions are:
Bottom diameter 200±2 mm
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WEngineering construction standard full text information system
Top diameter 100±2 mm
Height 300±2 mm
4. The rotating frame is connected to the measuring rod and the feeding hopper. A transparent and horizontal disc is installed at the bottom of the measuring rod, and the measuring rod is fixed in the sleeve with the measuring rod screw. The rotating frame is installed on the pillar, the direction is fixed by the cross groove, and its position is fixed by the positioning screw. After being in place, the axis of the measuring rod or the feeding hopper should coincide with the axis of the container. The diameter of the transparent disc is 230±2 mm and the thickness is 10±2 mm. The load block is directly fixed on the disc. The total weight of the sliding part consisting of the measuring rod, the disc and the load block should be 2750 ± 50 grams.
2. The end of the steel rod with a diameter of 16 mm and a length of 600 mm should be rounded. Article 3.2.3 The Vebe consistency test should be carried out according to the following steps: 1. Place the Vebe consistency meter on a solid and horizontal ground, and wet the container, the fall cylinder, the inner wall of the feeding hopper and other tools with a wet cloth. 2. Lift the feeding hopper to the fall cylinder and tighten it, correct the position of the container so that its center coincides with the center of the feeding hopper, and then tighten the fixing screws. 3. Use a small shovel to evenly load the concrete sample obtained as required into the cylinder in three layers through the feeding hopper. The loading and insertion methods should comply with the provisions of the second paragraph of Article 3.1.3.
4. Turn the feeding hopper away and lift the fall cylinder vertically. At this time, care should be taken not to cause lateral twisting of the concrete specimen. 5. Turn the transparent disc to the top of the concrete table, loosen the screw of the measuring rod, and lower the disc so that it touches the top of the concrete lightly. 6. Tighten the positioning screw and check whether the screw of the measuring rod has been completely loosened. 7. Use a stopwatch to time the vibration. When the bottom of the transparent disc is covered with cement slurry, stop the timer and turn off the vibration table. Article 3.2.4 The time (seconds) read by the stopwatch is the Vebe consistency value of the concrete mixture.
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Chapter 4 Mixture Bulk Density Test
Article 4.0.1 This method is applicable to the determination of the unit volume weight of the concrete mixture after it is exposed.
Article 4.0.2 The equipment used for the mixture bulk density test shall comply with the following provisions 1. Volume cylinder A cylinder made of metal with handles on both sides. For the mixture with the maximum aggregate size not exceeding 40 mm, a 5-liter capacity cylinder is used, whose inner diameter and cylinder height are both 186 ± 2 mm, and the cylinder wall thickness is 3 mm. When the maximum aggregate size is greater than 40 mm, the inner diameter and cylinder height of the capacity cylinder should be greater than 4 times the maximum aggregate size. The upper edge and inner wall of the capacity cylinder should be smooth and flat, and the top and bottom surfaces should be parallel and perpendicular to the axis of the cylinder.
2. The platform scale weighs 100 kg and the sensitivity is 50 grams. 2. The frequency of the vibration table should be 50 ± 3 Hz, and the amplitude when unloaded should be 0.5 ± 0.1 mm.
4. The tamping rod is a steel rod with a diameter of 16 mm and a length of 600 mm, and the end should be rounded. Article 4.0.3 The bulk density test of the mixture should be carried out according to the following steps: Wipe the inside and outside of the capacity cylinder with a wet cloth, and weigh the cylinder weight to an accuracy of 50 grams. 2. The loading and unpacking method of the concrete main should be determined according to the consistency of the mixture. For concrete with a fall of no more than 70 mm, it is appropriate to use a vibrating table to compact it, and for concrete with a fall of more than 70 mm, it is appropriate to use a tamping rod to compact it.
When using a tamping rod to compact, the layering and number of tamping times should be determined according to the size of the capacity cylinder. When using a 5-liter capacity cylinder, the concrete mixture should be loaded in two layers, and the number of tamping times for each layer should be 25 times. When using a capacity cylinder larger than 5 liters, the height of each layer of concrete should not be greater than 100 mm, and the number of tamping times for each layer should be calculated as no less than 12 times per 100 square centimeters of cross-section. Each tamping should be evenly distributed on the cross-section of each layer. When tamping the bottom layer, the tamping rod should penetrate the entire depth. When tamping the second layer, the tamping rod should penetrate the current layer to the surface of the next layer. Per Engineering Construction Standard Full-text Information System
W.bzsosO.coI2 Veber consistency meter
A-container
D-feeding hopper
G-vibration table
M-a holder
Q-screw of measuring rod
B-fall cylinder
E-a sleeve
H-fixing screw
N-rotating frame
C-transparent disc
F-positioning screw
J-measuring rod|| tt||P-load block
3. Drop cylinder
The internal dimensions are:
Bottom diameter 200±2 mm
Engineering construction standard full text information system
WEngineering construction standard full text information system
Top diameter 100±2 mm
Height 300±2 mm
4. The rotating frame is connected to the measuring rod and the feeding hopper. A transparent and horizontal disc is installed at the bottom of the measuring rod, and the measuring rod is fixed in the sleeve with the measuring rod screw. The rotating frame is installed on the pillar, the direction is fixed by the cross groove, and its position is fixed by the positioning screw. After being in place, the axis of the measuring rod or the feeding hopper should coincide with the axis of the container. The diameter of the transparent disc is 230±2 mm and the thickness is 10±2 mm. The load block is directly fixed on the disc. The total weight of the sliding part consisting of the measuring rod, the disc and the load block should be 2750 ± 50 grams.
2. The end of the steel rod with a diameter of 16 mm and a length of 600 mm should be rounded. Article 3.2.3 The Vebe consistency test should be carried out according to the following steps: 1. Place the Vebe consistency meter on a solid and horizontal ground, and wet the container, the fall cylinder, the inner wall of the feeding hopper and other tools with a wet cloth. 2. Lift the feeding hopper to the fall cylinder and tighten it, correct the position of the container so that its center coincides with the center of the feeding hopper, and then tighten the fixing screws. 3. Use a small shovel to evenly load the concrete sample obtained as required into the cylinder in three layers through the feeding hopper. The loading and insertion methods should comply with the provisions of the second paragraph of Article 3.1.3.
4. Turn the feeding hopper away and lift the fall cylinder vertically. At this time, care should be taken not to cause lateral twisting of the concrete specimen. 5. Turn the transparent disc to the top of the concrete table, loosen the screw of the measuring rod, and lower the disc so that it touches the top of the concrete lightly. 6. Tighten the positioning screw and check whether the screw of the measuring rod has been completely loosened. 7. Use a stopwatch to time the vibration. When the bottom of the transparent disc is covered with cement slurry, stop the timer and turn off the vibration table. Article 3.2.4 The time (seconds) read by the stopwatch is the Vebe consistency value of the concrete mixture.
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Chapter 4 Mixture Bulk Density Test
Article 4.0.1 This method is applicable to the determination of the unit volume weight of the concrete mixture after it is exposed.
Article 4.0.2 The equipment used for the mixture bulk density test shall comply with the following provisions 1. Volume cylinder A cylinder made of metal with handles on both sides. For the mixture with the maximum aggregate size not exceeding 40 mm, a 5-liter capacity cylinder is used, whose inner diameter and cylinder height are both 186 ± 2 mm, and the cylinder wall thickness is 3 mm. When the maximum aggregate size is greater than 40 mm, the inner diameter and cylinder height of the capacity cylinder should be greater than 4 times the maximum aggregate size. The upper edge and inner wall of the capacity cylinder should be smooth and flat, and the top and bottom surfaces should be parallel and perpendicular to the axis of the cylinder.
2. The platform scale weighs 100 kg and the sensitivity is 50 grams. 2. The frequency of the vibration table should be 50 ± 3 Hz, and the amplitude when unloaded should be 0.5 ± 0.1 mm.
4. The tamping rod is a steel rod with a diameter of 16 mm and a length of 600 mm, and the end should be rounded. Article 4.0.3 The bulk density test of the mixture should be carried out according to the following steps: Wipe the inside and outside of the capacity cylinder with a wet cloth, and weigh the cylinder weight to an accuracy of 50 grams. 2. The loading and unpacking method of the concrete main should be determined according to the consistency of the mixture. For concrete with a fall of no more than 70 mm, it is appropriate to use a vibrating table to compact it, and for concrete with a fall of more than 70 mm, it is appropriate to use a tamping rod to compact it.
When using a tamping rod to compact, the layering and number of tamping times should be determined according to the size of the capacity cylinder. When using a 5-liter capacity cylinder, the concrete mixture should be loaded in two layers, and the number of tamping times for each layer should be 25 times. When using a capacity cylinder larger than 5 liters, the height of each layer of concrete should not be greater than 100 mm, and the number of tamping times for each layer should be calculated as no less than 12 times per 100 square centimeters of cross-section. Each tamping should be evenly distributed on the cross-section of each layer. When tamping the bottom layer, the tamping rod should penetrate the entire depth. When tamping the second layer, the tamping rod should penetrate the current layer to the surface of the next layer. Per Engineering Construction Standard Full-text Information System
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