JGJ 56-1984 Quality standards and test methods for concrete water reducing agents
Some standard content:
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Ministry Standard of the Ministry of Urban and Rural Construction and Environmental Protection of the People's Republic of China
Quality Standards and Test Methods for Concrete Water Reducing Admixture Used for Concrete Quality Requirements and Testing Methods
JGJ56—84
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Ministry Standard of the Ministry of Urban and Rural Construction and Environmental Protection of the People's Republic of China
Quality Standards and Test Methods for Concrete Water Reducing Admixture Used for Concrete
-Ouality Requirements and
Testing Methods
JGJ56—84
Approved by the Ministry of Urban and Rural Construction and Environmental Protection of the People's Republic of China, issued on December 25, 1984, and implemented on July 1, 1985. Engineering Construction Standard Full-text Information System
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1.1 Scope of application
1.2 Definition and classification
Quality standard of concrete water reducer
2.1 Quality standard of concrete water reducer
2.2 Test conditions for mud concrete 2
2.3 Test items for concrete water reducer
3. Test methods for concrete water reducing agents
3.1 Water reduction ratebZxz.net
3.2 Bleeding rate
Air content (air pressure method)
Appendix A
Air content (water pressure method)
Setting time (penetration resistance method)
Cube compressive strength
Test methods for water reducing agent properties (reference)
Solid content or water content
A2PH value
A3 Specific gravity
A4 Density
A5 Loose bulk density
A.6 Surface tension (ring method)
A..7 Surface tension (capillary method)
A.8 Foaming property (machine shaking method)...
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A.9 Foaming property (hand shaking method).
A.10 Chloride content
Sulfate content (weight method)
Sulfate content (conversion method)
Total reducing substance content
Lignin content (hydrochloric acid method)
Lignin content (naphthylamine method)..
.............. 33
Rapid test for steel corrosion (determination of the anodic polarization potential of steel in saturated calcium hydroxide solution
A.17 Rapid test for steel corrosion (determination of the anodic polarization potential of steel in fresh mortar.
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A.18 Rapid test for steel corrosion (determination of the anodic polarization potential of steel in hardened mortar)
Appendix B
Appendix 4
Reduction Test methods for paste and mortar with water-reducing agent (reference) 43 Fluidity of cement paste
Water reduction rate of paste
Water reduction rate of mortar
Air content of mortar?
Test methods for concrete with water-reducing agent (reference) Slump and slump loss
Freeze-thaw resistance·
Test for steel corrosion in concrete·
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1. General
11 Scope of application
This standard applies to the quality assessment of water reducers for industrial and civil buildings and structures.
When selecting water reducers for a project, this standard can be used as a reference (the materials used in the project can be used for testing).
1.2 Definition and classification
Water reducers are admixtures that have the function of reducing water and strengthening concrete without affecting its workability. According to their functions, they are divided into ordinary water reducers, Water-reducing agent, high-efficiency water-reducing agent, early-strengthening water-reducing agent, slow-setting water-reducing agent and air-entraining water-reducing agent. 12.1 Ordinary water-reducing agent
Water-reducing agent with general water-reducing and strengthening effects. 1.2.2 High-efficiency water-reducing agent
Water-reducing agent with large-scale water-reducing and strengthening effects. 1.2.3 Early-strengthening water-reducing agent
Water-reducing agent with both early-strengthening effect.
12.4 Slow-setting water-reducing agent
Water-reducing agent with both slow-setting effect.
1.2.5 Air-entraining water-reducing agent
Water-reducing agent with both air-entraining effect.
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2. Quality Standard of Concrete Water Reducer
2.1 Quality Standard of Concrete Water Reducer
The performance of concrete mixed with water reducer shall be measured for any water reducer, and the requirements of quality standard of concrete water reducer shall be met in Table 2.1. 2.2 Test Conditions of Concrete
When testing the quality of concrete water reducer, the test conditions of concrete shall comply with the following provisions:
2.2.1 Materials
22.1.1 Cement: Ordinary Portland cement No. 425 or No. 525 with CsA content of 5~8% in clinker and dihydrate paste as setting agent shall be used, and its quality shall meet the current national cement standards. If hard stone is used as a setting agent, its dosage should not exceed 1/2 of the total setting agent.
2.2.1.2 Sand: Use medium sand from Zone 2, which should comply with (JGJ52-79) "Quality Standard and Test Method for Sand Used in Concrete". 2.2.1.3 Stone: Use pebbles or crushed stones with a particle size of 5 to 20 mm, which should comply with (JGJ5379) "Quality Standard and Test Method for Pebbles or Crushed Stone Used in Ordinary Concrete".
22.1.4 Water: Use clean drinking water. 22.2 Benchmark concrete
2.2.2.1 Cement dosage 305±5kg/m
2.2.2.2 Sand ratio Select the best sand ratio for benchmark concrete through trial mixing. Engineering 2 Construction Standard Full Text Information System
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2.2.2.3 Fall 6±1cm.
2.2.3 Test Concrete
2.2.3.1 The amount of cement, sand and gravel is the same as that of the reference concrete. The sand ratio of the concrete with air-entraining water-reducing agent should be reduced by 1~3% compared with the sand ratio of the reference concrete.
2.2.3.2 Fall 6±1cm.
2.2.3.3 Water-reducing agent dosage, according to the dosage recommended by the research and development unit or manufacturer
2.2.4 Test block preparation and curing
2.2.4.1 Mixing method: The test concrete should be mixed under the same conditions as the reference concrete. The test adopts mechanical mixing. After pouring all the materials and water-reducing agent into the mixer, stir for three minutes. After discharging, turn it over and mix it twice manually on the iron plate. The mixing amount should not be less than one-fourth of the rated mixing amount of the mixer. 2.2.4.2 Test block preparation and curing: The molding and vibration method of the test block should be consistent with the molding method for air content determination. Use a vibration table to mold and vibrate for 15 to 20 seconds; use an inserted high-frequency vibrator and vibrate for 10 seconds. After molding, the test block should be covered to prevent water evaporation. At room temperature of 20 ± 3 ° C, let it stand overnight, then number and demold. After demolding, the test block is placed upright in a standard curing room with a temperature of 20 ± 3 ° C and a humidity of more than 90% for curing.
2.3 Test items for concrete water reducers
23.T It is necessary to conduct tests on water reduction rate, water seepage rate, air content, setting time, compressive strength, and shrinkage of concrete with water reducers. 23.2 Water reducer products should be uniform and stable. To this end, the following items should be regularly selected and tested according to the type of water reducer: solid content or water content P value, specific gravity, density, loose bulk density, surface tension, foaming property, chloride content, main component content (such as sulfate content, reducing sugar content, lignin content, etc.), steel bar corrosion rapid test, net slurry fluidity, net slurry water reduction rate, mortar water reduction rate, mortar air content, etc.
2.3.3 In addition to the items required by Table 2.1, the performance of concrete with water reducers should be tested according to the requirements of the project, such as freeze-thaw resistance and steel bar corrosion test in concrete.
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3. Test method for concrete water reducing agent
3.1 Water reduction rate
3.1.1 Instruments and equipment
a. Falling cylinder;
b. Tamping rod;
c.Small shovel, steel ruler, trowel, etc.
3.1.2 Test steps
3.1.2.1 Determine the slump of the reference concrete and record the unit water consumption (W.) when the slump is reached.
3T.2.2 Under the condition of the same cement dosage and the constant proportion of cement, sand and stone, determine the unit water consumption (W1) when the concrete with water reducer reaches the same slump as the reference concrete.
31.3 Test result processing
The water reduction rate is calculated according to formula (3.1):
Water reduction rate (%):
Where Wa
WWix100
Unit water consumption of reference concrete (kg/m): W1-unit water consumption of concrete with water reducer (kg/m). 3.2 Bleeding rate
3.2.1 Instruments and equipment
a. Bulk density cylinder: take an inner diameter of 18.5cm, a height of 20cm, and a volume of 5L Engineering Construction Standard Full-text Information System
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Water reduction rate (%)
Bleeding rate ratio (%)
Air content (absolute value %)
Difference in setting time
(hours*minutes)
Compressive strength ratio
Ordinary type
Concrete water reducer quality standard
High-efficiency type
Grass-strong type|| tt||Air-entrained type
—1:00~+2:00
-1:00~+2:00+2:00~+6:00
-1:0p~+2:00
—1:00~+2:00
-1:00~+200—1:00~+2:00—1#00~+200+2:00~+6:00—1*0~+2:00Final setting
months) increase not more than
mm/m)
≥135
1.The data listed in the table are the difference or ratio between the test concrete and the reference concrete. Note: ≥110 2. Article 7 of the Technical Regulations for the Use of Calcium Lignosulfonate Water-Reducing Agent in Concrete approved by the former National Capital Construction Committee in 1980 shall be invalidated from the date of implementation of this standard.
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density cylinder with cover (or glass plate); b. Scale: weighing 50kg, sensitivity 50g;
c. Stoppered measuring tube: 100ml;
d. Others: pipette, timer, shovel, tamper and spatula, etc. 3.2.2 Test steps
3.2.2.1 Wet the bulk density cylinder with a damp cloth and weigh Go; 3.2.2.2 Put the concrete mixture into the cylinder at once, vibrate it on a vibration table for 70 seconds, and then use a spatula to gently smooth the top surface. The surface of the sample should be about 2 cm lower than the edge of the cylinder.
3.2.2.3 Wipe the outer wall and edge of the cylinder clean, weigh the total weight of the cylinder and the sample G1, and then place the cylinder on the ground and cover it to prevent water evaporation. 3.2.2.4 Calculate the time from the start of plastering. Use a pipette to suck out the seepage water every 10 minutes for the first 60 minutes, and then suck out the water every 20 minutes until there is no seepage for three consecutive times. Pour the sucked water into the measuring cylinder and read the cumulative value of each sucked water, accurate to milliliters.
32.2.5 Five minutes before each suction of seepage water, one side of the bottom of the cylinder should be raised by about 2 cm to tilt the cylinder for easy suction of seepage water. After removing the seepage water, the cylinder should still be gently laid flat and covered.
3.2.3 Test result processing
The seepage rate is calculated according to the following formula:
B (%)
(wJo)m
Gw=Gi-Go
W——Total amount of seepage water (g)
W——Water consumption of concrete mixture (g); G—Total weight of concrete mixture (g) Engineering Construction Standard Full-text Information System
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Gw——Test sample weight (g);
Gi——Test sample weight (g);
Go——Cylinder weight (g).
The water bleeding rate value is the arithmetic mean of three samples. If the difference between one of them and the average value is greater than 20% of the average value, the average value of two similar results is taken. The water bleeding rate ratio is calculated as follows:
Water bleeding rate of concrete with water reducing agent
Water bleeding rate ratio
Water bleeding rate of benchmark concrete
3.3 Air content (air pressure method)
Refer to the national standard concrete basic performance test-mixture performance test.
Note: When testing the water reducing agent molding, the loading and vibration method is different from the national standard and should be in accordance with the following regulations: ① The concrete sample fills the container at one time and is slightly higher than the container. ② Use a vibrating table to mold and vibrate for 15 to 20 seconds. Use an inserted high-frequency vibrator (034mm, 14,000 times/min) to mold and vibrate for 10 seconds. The rod head is inserted along the center of the sample and is about 2 cm from the bottom. 3.4 Air content (water pressure method)
Refer to the national standard Concrete basic performance test
-Mixture performance test
Note: When testing the water reducer molding, the loading and vibration methods are different from the national standard, and should be in accordance with the following regulations: ① Fill the container with ten samples at a time, and slightly increase the empty container ② Use a vibration table to mold, vibrate for 15~20 seconds. Use an inserted high-frequency vibrator (34mm, 14000 times/min) to mold, vibrate for 10 seconds, and insert the rod head along the center of the sample, about 2 cm from the bottom. 3.5 Setting time (penetration resistance method)
3.5.1 Instruments and equipment
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bzsosO,m3. Wipe the outer wall and edge of the cylinder clean, weigh the total weight of the cylinder and the sample G1, then place the cylinder on the ground and cover it to prevent water evaporation. 3.2.2.4 Calculate the time from the start of plastering. Use a pipette to suck out the seepage water every 10 minutes for the first 60 minutes, and then suck out the water every 20 minutes until there is no seepage for three consecutive times. Pour the sucked water into the measuring cylinder, and read the cumulative value of each sucked water, accurate to milliliters.
32.2.5 Five minutes before sucking out the seepage water each time, one side of the cylinder bottom should be raised by about 2 cm to tilt the cylinder to facilitate sucking out the seepage water. After taking out the seepage water, gently lay the cylinder flat and cover it.
3.2.3 Test result processing
The water seepage rate is calculated as follows:
B (%)
(wJo)m
Gw=Gi-Go
Wherein, B——water seepage rate (%);
——total water seepage (g);
W——water consumption of concrete mixture (g);G——total weight of concrete mixture (g) Engineering Construction Standard Full-text Information System
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Gw——sample weight (g);
Gi——weight of cylinder and sample (g);
Go——tube weight (g).
The water seepage rate value is the arithmetic mean of the three samples. If the difference between one of them and the average value is greater than 20% of the average value, the average of the two similar results is taken. The water bleeding rate ratio is calculated as follows:
Water bleeding rate of concrete with water reducing agent
Water bleeding rate ratio
Water bleeding rate of benchmark concrete
3.3 Air content (air pressure method)
Refer to the national standard concrete basic performance test-mixture performance test.
Note: When testing the water reducing agent molding, the loading and vibration method is different from the national standard and should be in accordance with the following regulations: ① The concrete sample fills the container at one time and is slightly higher than the container. ② Use a vibrating table to mold and vibrate for 15 to 20 seconds. Use an inserted high-frequency vibrator (034mm, 14,000 times/min) to mold and vibrate for 10 seconds. The rod head is inserted along the center of the sample, about 2 cm from the bottom. 3.4 Air content (water pressure method)
Refer to the national standard Concrete basic performance test
-Mixture performance test
Note: When testing the water reducer molding, the loading and vibration methods are different from the national standard, and should be in accordance with the following regulations: ① Fill the container with ten samples at a time, and slightly increase the empty container ② Use a vibration table to mold, vibrate for 15~20 seconds. Use an inserted high-frequency vibrator (34mm, 14000 times/min) to mold, vibrate for 10 seconds, and insert the rod head along the center of the sample, about 2 cm from the bottom. 3.5 Setting time (penetration resistance method)
3.5.1 Instruments and equipment
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bzsosO,m3. Wipe the outer wall and edge of the cylinder clean, weigh the total weight of the cylinder and the sample G1, then place the cylinder on the ground and cover it to prevent water evaporation. 3.2.2.4 Calculate the time from the start of plastering. Use a pipette to suck out the seepage water every 10 minutes for the first 60 minutes, and then suck out the water every 20 minutes until there is no seepage for three consecutive times. Pour the sucked water into the measuring cylinder, and read the cumulative value of each sucked water, accurate to milliliters.
32.2.5 Five minutes before sucking out the seepage water each time, one side of the cylinder bottom should be raised by about 2 cm to tilt the cylinder to facilitate sucking out the seepage water. After taking out the seepage water, gently lay the cylinder flat and cover it.
3.2.3 Test result processing
The water seepage rate is calculated as follows:
B (%)
(wJo)m
Gw=Gi-Go
Wherein, B——water seepage rate (%);
——total water seepage (g);
W——water consumption of concrete mixture (g);G——total weight of concrete mixture (g) Engineering Construction Standard Full-text Information System
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Gw——sample weight (g);
Gi——weight of cylinder and sample (g);
Go——tube weight (g).
The water seepage rate value is the arithmetic mean of the three samples. If the difference between one of them and the average value is greater than 20% of the average value, the average of the two similar results is taken. The water bleeding rate ratio is calculated as follows:
Water bleeding rate of concrete with water reducing agent
Water bleeding rate ratio
Water bleeding rate of benchmark concrete
3.3 Air content (air pressure method)
Refer to the national standard concrete basic performance test-mixture performance test.
Note: When testing the water reducing agent molding, the loading and vibration method is different from the national standard and should be in accordance with the following regulations: ① The concrete sample fills the container at one time and is slightly higher than the container. ② Use a vibrating table to mold and vibrate for 15 to 20 seconds. Use an inserted high-frequency vibrator (034mm, 14,000 times/min) to mold and vibrate for 10 seconds. The rod head is inserted along the center of the sample, about 2 cm from the bottom. 3.4 Air content (water pressure method)
Refer to the national standard Concrete basic performance test
-Mixture performance test
Note: When testing the water reducer molding, the loading and vibration methods are different from the national standard, and should be in accordance with the following regulations: ① Fill the container with ten samples at a time, and slightly increase the empty container ② Use a vibration table to mold, vibrate for 15~20 seconds. Use an inserted high-frequency vibrator (34mm, 14000 times/min) to mold, vibrate for 10 seconds, and insert the rod head along the center of the sample, about 2 cm from the bottom. 3.5 Setting time (penetration resistance method)
3.5.1 Instruments and equipment
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