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GB/T 23439-2017 English PDF

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GB/T 23439-2017: [Including Modification 2018XG1] Expansive agents for concrete
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GB/T 23439: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB/T 23439-2017English359 Add to Cart 4 days [Need to translate] [Including Modification 2018XG1] Expansive agents for concrete Valid GB/T 23439-2017
GB 23439-2009English639 Add to Cart 3 days [Need to translate] [GB/T 23439-2009] Expansive agents for concrete Obsolete GB 23439-2009

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Basic data

Standard ID GB/T 23439-2017 (GB/T23439-2017)
Description (Translated English) [Including Modification 2018XG1] Expansive agents for concrete
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard Q12
Classification of International Standard 91.100.30
Word Count Estimation 18,178
Date of Issue 2017-12-29
Date of Implementation 2018-11-01
Older Standard (superseded by this standard) GB/T 23439-2009
Regulation (derived from) National Standards Bulletin 2017 No. 32
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China

GB/T 23439-2017: [Including Modification 2018XG1] Expansive agents for concrete

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Expansive agents for concrete ICS 91.100.30 Q12 National Standards of People's Republic of China Replace GB/T 23439-2009 Concrete expansion agent Released on.2017-12-29 2018-11-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China China National Standardization Administration issued

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 23439-2009 "Concrete Expansion Agent". Compared with GB/T 23439-2009, except editorial modification The technical content changes are as follows. --- Revised the requirements for limiting expansion rate and strength (see Chapter 5 and Chapter 5 of the.2009 edition); --- Revised the test method for compressive strength (see Chapter 6 and Chapter 6 of the.2009 edition); --- Revised inspection rules (see Chapter 7 and Chapter 7 of the.2009 edition); ---Modified packaging (see Chapter 8 and Chapter 8 of the.2009 edition); --- Added Test Method B of Appendix A (see Appendix A); --- Added Test Method B of Appendix B (see Appendix B). This standard was proposed by the China Building Materials Federation. This standard is under the jurisdiction of the National Cement Products Standardization Technical Committee (SAC/TC197). This standard is drafted by. China Building Materials Science Research Institute. Participated in the drafting of this standard. Zhengzhou Jianwen Special Material Technology Co., Ltd., Tianjin Leopard Ming Co., Ltd., Chongqing Sansheng Industrial Co., Ltd. Co., Ltd., Jiangsu Subote New Materials Co., Ltd., Shandong Institute of Building Science, Wuhan Sanyuan Special Building Materials Co., Ltd., Zhejiang Heli Haike New Material Co., Ltd., Hangzhou Lidun Concrete Admixture Co., Ltd., Jinhua Xinsheng Zeolite Development Co., Ltd. Hunan Wuyuan Building Materials Co., Ltd., Chongqing Daye New Building Materials Group Co., Ltd., Shouguang Lifei Concrete Admixture Co., Ltd. The main drafters of this standard. Zhao Shunzeng, Liu Li, Zhang Xuewen, Liu Fuquan, Li Guangming, Tian Qian, Wang Yongwei, Yuan Lidong, Ding Xiaofu, Deng Qinghong, Hu Jingbo, Yuan Liming, Lu Jian, Feng Xinli, Jia Fuji, Li Changcheng. The previous versions of the standards replaced by this standard are. ---GB/T 23439-2009. Concrete expansion agent

1 Scope

This standard specifies the terms and definitions, classification and marking, requirements, test methods, inspection rules and packaging, marking, and transportation of concrete expansion agents. Loss and storage. This standard applies to calcium sulphoaluminate, calcium oxide and calcium sulphoaluminate-calcium oxide powder concrete expansion agent.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document. GB/T 176 cement chemical analysis method GB/T 700 carbon structural steel GB/T 1345 Cement fineness test method sieve analysis method GB/T 1346 Cement standard consistency water consumption, setting time, stability test method GB/T 1499.2 Steel for reinforced concrete - Part 2. Hot rolled ribbed bars GB/T 4357 cold drawn carbon spring wire GB/T 6003.1 Test sieves - Technical requirements and testing - Part 1 GB/T 8074 Determination of specific surface area of cement - Method GB 8076 concrete admixture GB/T 12573 cement sampling method GB/T 17671 Cement mortar strength test method (ISO method) GB/T 50081 Standard test method for mechanical properties of ordinary concrete JGJ63 concrete water standard YB/T 5241 low expansion iron nickel, iron nickel cobalt alloy

3 Terms and definitions

The following terms and definitions apply to this document. 3.1 After mixing with cement and water, it will be hydrated to form ettringite, calcium hydroxide or ettringite and calcium hydroxide, which will cause volume expansion of concrete. Admixture. 3.2 Concrete expansion agent which forms ettringite by hydration reaction with cement and water. 3.3 Concrete expansion agent which is mixed with cement and water and then hydrated to form calcium hydroxide. 3.4 Calcium sulphoaluminate-calcium oxide concrete expansion agent calciumsulphoaluminate-calciumoxideexpansiveagents Forconcrete Concrete expansion agent which forms ettringite and calcium hydroxide by hydration reaction with cement and water.

4 Classification and marking

4.1 Classification 4.1.1 Concrete expansion agent is divided into hydrated products. calcium sulphoaluminate concrete expansion agent (code A), calcium oxide concrete expansion agent (generation No. C) and calcium sulphoaluminate-calcium oxide concrete expansion agent (code AC) three categories. 4.1.2 Concrete expansion agents are classified into Type I and Type II according to the limiting expansion ratio. 4.2 Marking All concrete expander product names covered by this standard are marked as EA and are marked in the following order. product name, code number, type No., standard number. Example.

5 requirements

5.1 Chemical composition 5.1.1 Magnesium oxide The magnesium oxide content of the concrete expansion agent should be no more than 5%. 5.1.2 Alkali content (selectivity index) The alkali content in the concrete expansion agent is expressed as Na2O 0.658K2O. If active aggregate is used, the user is required to provide low alkali In the case of concrete expansion agents, the alkali content of the concrete expansion agent should be no more than 0.75%, or determined by both parties. 5.2 Physical properties The physical properties of concrete expansion agents shall comply with the requirements of Table 1. Table 1 Concrete expansion agent performance indicators project Index value Type I II Fineness Specific surface area/(m2/kg) ≥.200 1.18mm sieve residue /% ≤ 0.5 Setting time Initial setting/min ≥ 45 Final setting/min ≤ 600 Table 1 (continued) project Index value Type I II Limit expansion rate /% 7d ≥ 0.035 0.050 in water 21d ≥ -0.015 -0.010 in the air Compressive strength/MPa 7d ≥ 22.5 28d ≥ 42.5

6 Test methods

6.1 Chemical composition The content of magnesium oxide and alkali is carried out according to GB/T 176. 6.2 Physical properties 6.2.1 Test materials 6.2.1.1 Cement Use the benchmark cement specified in GB 8076. When the reference cement is not available, it is allowed to use the clinker and the dihydrate gypsum together. Made of Portland cement with a strength grade of 42.5, and C3A content in clinker is 6%~8%, C3S content is 55%~60%, free calcium oxide Not more than 1.2%, the alkali (Na2O 0.658K2O) content does not exceed 0.7%, and the specific surface area of the cement (350 ± 10) m2/kg. 6.2.1.2 Standard sand Meet the requirements of GB/T 17671. 6.2.1.3 Water Meet the requirements of JGJ63. 6.2.2 Fineness The specific surface area is determined according to the provisions of GB/T 8074. The 1.18mm sieve residue is measured by the metal sieve specified in GB/T 6003.1. Refer to GB/T 1345 for manual dry screening. 6.2.3 Setting time According to GB/T 1346, the expansion agent is doped with 10%. 6.2.4 Limiting the expansion ratio According to Appendix A, when the test results of the two methods A and B are different, the B method shall prevail. Note 1. Refer to Appendix B for the test method for unidirectional limiting expansion performance of concrete with concrete expansion agent. Note 2. Refer to Appendix C for the rapid test method for the expansion performance of cement slurry or concrete with concrete expansion agent. 6.2.5 Compressive strength According to GB/T 17671. Note. Refer to Appendix D for the test method of compressive strength under concrete restraint with expansion agent. The materials and amounts to be weighed for each of the three test pieces are shown in Table 2. Table 2 compressive strength materials and dosage units are grams Material code material quality Cement C 427.5±2.0 Expansion agent E 22.5±0.1 Standard sand S 1350.0±5.0 Mixing water W 225.0±1.0 Note. CE=0.05 ; S CE=3.00 ; W CE=0.50

7 Inspection rules

7.1 Inspection classification 7.1.1 Factory inspection The factory inspection items are. fineness, setting time, limited expansion rate of 7d in water, and compressive strength of 7d. 7.1.2 Type inspection Type inspection items include all items specified in Chapter 5. Type inspection should be carried out in any of the following cases. a) At least once every six months during normal production; b) Trial-type identification of new products or old products to the factory; c) After formal production, if there are major changes in materials and processes, which may affect product performance; d) when the product is discontinued for more than 90 days, when the production is resumed; e) When the factory inspection result is significantly different from the previous type inspection. 7.2 Numbering and sampling The expansion agents are numbered and sampled by the same type. Bag and bulk expanders should be numbered and sampled separately. Expansion agent factory number according to production Capacity regulations. When the daily output exceeds.200t, the number is not more than.200t; when it is less than.200t, the daily output is numbered. Each number is a sampling unit, and the sampling method is carried out according to GB/T 12573. Sampling should be representative and can be taken continuously or from More than 20 different parts take the same amount of sample, the total amount is not less than 10kg. The samples obtained from each number should be thoroughly mixed and divided into two equal parts. one for the test sample and one for the sealed sample, sealed for 180 days. 7.3 Decision rules 7.3.1 Factory inspection judgment The type inspection report is valid within the validity period, and the result of the factory inspection project meets the requirements, and the factory inspection can be judged to be qualified. 7.3.2 Type test judgment The product performance indicators all meet all the requirements specified in Chapter 5, and the type inspection can be judged to be qualified. Otherwise, the batch number is not determined. qualified. 7.4 Factory inspection report The contents of the factory inspection report shall include the factory inspection items and other technical requirements stipulated in the contract. The producer shall send the inspection results other than the 28d compressive strength test results within 12 days from the date of delivery of the product, within 32 days. Supplement the 28d intensity test results. 8 Packaging, marking, transportation and storage 8.1 Packaging Products can be packed in bags or in bulk. Use a moisture-proof bag when packing. The bagged product has a net content of 50kg per bag and must not be less than the mark. 99% of the content. Randomly extract 20 bags, the total net content of the product shall not be less than 1000kg. Other forms of packaging are determined by the supplier and the purchaser. 8.2 mark The package should be clearly marked. product name, trademark, mark, factory number, date of packaging, net content, producer name and strict protection against moisture And so on. Cards with the same contents as the bagged logo should be submitted in bulk. 8.3 Transportation and storage When transporting and storing the product, the product shall not be damp and mixed with debris. Different types of products shall be stored separately and shall not be mixed. The product shall be calculated from the date of packaging, and the storage period shall be 180d under the conditions of packaging, transportation and storage in accordance with the standard, and the expiration shall be in accordance with Table 1. New physical performance test.

Appendix A

(normative appendix) Limit expansion rate test method A.1 Overview This appendix specifies the test method for limiting the expansion ratio of concrete expansion agent, which is divided into Test Method A and Test Method B. A.2 Test Method A A.2.1 Instruments A.2.1.1 Mixer, shaker, test and feeding funnel According to GB/T 17671 regulations. A.2.1.2 Measuring instrument The measuring instrument consists of a dial gauge, a bracket and a standard rod (Fig. A.1), and the resolution of the dial gauge is 0.001 mm. The unit is mm Description. 1--- dial indicator; 2---bracket; 3---standard pole. Figure A.1 A method measuring instrument A.2.1.3 Vertical limiter The longitudinal limiter shall comply with the following regulations. a) The longitudinal limiter is made of longitudinal steel wire welded to the steel plate (Fig. A.2). b) The steel wire adopts the D-class spring steel wire specified in GB 4357, and the pull-out strength of the brazed joint is not less than 785 MPa. c) The longitudinal limiter should not be deformed, and the number of factory inspections should not exceed 5, and the third-party inspection agency must not exceed the inspection time. 1 time. The unit is mm Description. 1---steel plate; 2---steel wire; 3---brass weld. Figure A.2 Vertical Limiter A.2.2 Laboratory environmental conditions A.2.2.1 The temperature and humidity of the test room, maintenance box and curing water should meet the requirements of GB/T 17671. A.2.2.2 The temperature of the constant temperature and humidity (box) chamber is (20 ± 2) ° C, and the humidity is (60 ± 5)%. A.2.2.3 The temperature and humidity changes should be checked and recorded daily. A.2.3 Preparation of the test body A.2.3.1 Test materials See 6.2.1. A.2.3.2 Cement mortar mix ratio The materials and dosages to be weighed for each of the three test pieces are shown in Table A.1. Table A.1 Limiting expansion rate Test materials and dosage units are in grams Material code material quality Cement C 607.5±2.0 Expansion agent E 67.5±0.2 Standard sand S 1350.0±5.0 Mixing water W 270.0±1.0 Note. CE=0.10 ; S CE=2.00 ; W CE=0.40 A.2.3.3 Cement mortar mixing, prototype molding According to GB/T 17671 regulations. There are 3 specimens for the length measurement in the same condition. The length of the specimen is 158mm, of which the size of the mortar is part. It is 40mm × 40mm × 140mm. A.2.3.4 Sample demoulding The demolding time is determined by the time when the compressive strength of the proportioned test body reaches (10 ± 2) MPa as specified in A.2.4.2. A.2.4 Test length measurement 3 hours before the measurement, the measuring instrument and the standard rod were placed in a standard test chamber, and the measuring instrument was calibrated with a standard rod and the dial gauge zero point was adjusted. measuring Before cleaning the test piece and the measuring instrument head. For each measurement, the side of the specimen marked with the mark should be consistent with the relative position of the measuring instrument, and the longitudinal limit The probe and the measuring probe should be in proper contact and the reading should be accurate to 0.001 mm. Test specimens of different ages should be within ±1 h of the specified time measuring. The initial length of the test piece was measured within 1 h after the test piece was released. The test piece whose initial length was measured was immediately placed in water for maintenance, and the length of the 7th day in the water was measured. Then put in constant temperature and humidity (box) Room maintenance, measuring the length of the 21st into the air. It is also possible to measure the length of different ages as needed and observe the change in expansion and contraction. trend. When curing, care should be taken not to damage the test probe. The test piece should be kept at intervals of 15mm or more, and the test piece support point should be limited to the ends of the steel plate. 30mm. A.2.5 Calculation of results The limit expansion rate of each age is calculated according to formula (A.1). ε= L1-L L0 × 100 (A.1) In the formula. ε --- the limit expansion rate of the measured age, %; L1---Measurement value of the test body length measured in millimeters (mm); L --- initial length measurement of the test piece, in millimeters (mm); L0---The reference length of the test piece, 140mm. The average of the measured values of the two samples was taken as the measurement result of the limiting expansion ratio, and the calculated value was accurate to 0.001%. A.3 Test Method B A.3.1 Instruments A.3.1.1 Mixer, shaker, test and feeding funnel According to GB/T 17671 regulations. A.3.1.2 Measuring instrument The measuring instrument consists of a dial gauge, a bracket and a maintenance tank (Fig. A.3). The resolution of the dial gauge is 0.001 mm. Description. 1--- dial indicator; 2---bracket; 3---conservation tank; 4---upper probe; 5---sample; 6---lower end plate. Figure A.3 B method measuring instrument A.3.1.3 Vertical limiter Same as A.2.1.3. A.3.2 Laboratory temperature and humidity Same as A.2.2. A.3.3 Preparation of the test body Same as A.2.3. A.3.4 Test length measurement 3 hours before the measurement, the measuring instrument, the constant temperature water tank, and the tap water were placed in a standard test chamber at a constant temperature, and the test body and the measuring instrument probe were wiped clean. After the specimen is demolded, it should be fixed on the measuring bracket within 1 h, and the measuring bracket and the test body should be placed together in a constant temperature water tank without water. The initial length of the body. Then, the tap water with a temperature of (20±2) °C is injected into the constant temperature water tank, and the water surface should be higher than the cement mortar portion of the test body. It is not allowed to move the test body and the constant temperature water tank during maintenance in the water. Measure the length of the sample placed in the water for the 7th day, then release the constant temperature within 1h. The water in the water tank, take the measuring bracket together with the test body and put it into the constant temperature and humidity (box) room for maintenance, adjust the dial gauge reading to the length before the water is discharged. Value, and then measure the length of the test piece placed in the air for the 21st day. It is also possible to record the reading of the dial gauge when the test body is placed in a constant temperature and humidity chamber. The length of the test piece placed in the air for the 21st day was measured and corrected at the time of calculation. The length of different ages can also be measured as needed to observe the trend of expansion and contraction. The measurement reading should be accurate to 0.001mm. Test specimens of different ages should be measured within ±1 h of the specified time. A.3.5 Calculation of results Same as A.2.5.

Appendix B

(informative appendix) Test method for limiting expansion and contraction of concrete with expansion agent B.1 Overview The method is suitable for determining the limiting expansion ratio of the concrete mixed with the expansion agent and limiting the shrinkage ratio. Divided into test method A and test method B, When the test results of the two test methods are different, the test method B shall prevail. B.2 Test Method A B.2.1 Instruments B.2.1.1 Measuring instrument The measuring instrument consists of a dial gauge, a bracket and a standard rod (Fig. B.1), and the dial gauge has a resolution of 0.001 mm. Description. 1--- dial indicator; 2---standard pole; 3---bracket. Figure B.1 A method measuring instrument B.2.1.2 Vertical limiter The longitudinal limiter shall comply with the following regulations. a) The longitudinal limiter is made of longitudinally constrained steel bars welded to the steel plate (Fig. B.2). b) The longitudinal restraining steel bars are made of steel bars specified in GB/T 1499.2 with a diameter of 10 mm and a cross-sectional area of 78.54 mm2. Reinforcement Two welding and welding 12mm thick steel plates, the material meets the technical requirements of GB/T 700, and the ends of the steel bars are 7.5mm in diameter. Or stainless steel, the probe is spherical and has a radius of 3mm. The welding strength of the welded joint between the steel plate and the steel bar shall not be lower than 260 MPa. c) The longitudinal limiter should not be deformed and the general test can be repeated 3 times. d) The longitudinal limiter has a reinforcement ratio of 0.79%. The unit is mm Description. 1---end plate; 2---Rebar. Figure B.2 Portrait Limiter B.2.2 Laboratory environmental conditions B.2.2.1 The temperature of the laboratory used for the forming and measuring of concrete specimens is (20 ± 2) °C. B.2.2.2 The temperature of the constant temperature water tank used to maintain the concrete sample is (20 ± 2) °C. The temperature of the constant temperature and humidity chamber is (20 ± 2) ° C, and the humidity is (60 ± 5)%. B.2.2.3 Daily temperature should be checked and recorded. B.2.3 Sample production The model used for the molded specimen has a width and a height of 100 mm and a length of more than 360 mm. There are 3 test pieces for the length measurement in the same condition. The total length of the test piece is 355mm, and the concrete part size is 100mm×100mm× 300mm. First, put the longitudinal restraint into the test mold, then load the concrete into the test mold once, and place the test mold on the vibrating table to vibrate to the surface. Now the cement slurry, without air bubbles, scrape off the excess concrete and smooth it; then place the test piece in a curing room at a temperature of (20 ± 2) °C. Protect the surface of the test piece with a plastic cloth or a damp cloth to prevent evaporation of water; When the concrete compressive strength reaches 3MPa~5MPa, the mold is removed (12h~16h after forming). B.2.4 Test length measurement and maintenance B.2.4.1 Test length measurement The preparation and operation method before length measurement are carried out in accordance with A.2.4, and the test piece whose initial length is measured is immediately placed in a constant temperature water tank for maintenance. Length measurement during the ageing period. The length of the length measurement is calculated from the stirring of the water, and the length changes of 3d, 7d and 14d are generally measured. After 14 days, the test body was moved to a constant temperature. The maintenance in the constant humidity chamber was carried out to measure the length changes of 28d and 42d in the air. The age of measurement can also be arranged as needed. B.2.4.2 Test body maintenance When curing, care should be taken not to damage the test probe. The test piece should be kept at intervals of 25mm or more, and the test piece support point should be limited to the ends of the steel plate. 70mm. B.2.5 Calculation of results The rate of change of length is calculated according to formula (B.1). ε= L1-L L0 × 100 (B.1) In the formula. ε --- the rate of change of the length of the measured age, %; L1 --- measured length of the test body in the measurement period, in millimeters (mm); L --- initial length measurement in millimeters (mm); L0 --- The reference length of the test piece, 300mm. The average value of the measured values of the two samples was taken as the measurement result of the rate of change of the length, and the calculated value was accurate to 0.001%. The expansion or contraction stress introduced into the concrete is calculated according to formula (B.2). σ=μ·E·ε (B.2) In the formula. σ---expansion or contraction stress in megapascals (MPa); μ---reinforcing ratio, %; E---limit the elastic modulus of the steel bar, take 2.0 × 105MPa; ε---the rate of change in length of the measured age, %. The calculated value is accurate to 0.01 MPa. B.3 Test Method B B.3.1 Instruments B.3.1.1 longitudinal limiter The longitudinal limiter shall comply with the following regulations. a) The longitudinal limiter is made of longitudinally constrained steel bars welded to the steel plate (Fig. B.3). b) The longitudinal restraining steel bars are made of steel bars specified in GB/T 1499.2 with a diameter of 10 mm and a cross-sectional area of 78.54 mm2. Reinforcement The 12mm thick steel plate is welded on both sides, and the material meets the technical requirements of GB/T 700. Welding strength of welded joints between steel plates and steel bars, not It should be lower than 260MPa. c) The longitudinal limiter should not be deformed and the general test can be repeated 3 times. d) The longitudinal limiter has a reinforcement ratio of 0.79%. The unit is mm Descriptio...

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