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JG/T 568-2019 English PDF

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JG/T 568-2019: Aggregate for high performance concrete
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Basic data

Standard ID JG/T 568-2019 (JG/T568-2019)
Description (Translated English) Aggregate for high performance concrete
Sector / Industry Building & Construction Industry Standard (Recommended)
Classification of Chinese Standard Q13
Classification of International Standard 91.100.99
Word Count Estimation 22,297
Date of Issue 2019-10-28
Date of Implementation 2020-06-01
Quoted Standard GB 175; GB/T 601; GB/T 602; GB/T 2419; GB 6566; GB 8076; GB/T 14684; GB/T 14685; GB/T 17671; GB/T 50733; JG/T 223
Regulation (derived from) Industry Standard Record Monthly Report No. 3, 2020 (Total No. 239)
Issuing agency(ies) Ministry of Housing and Urban-Rural Development of the People's Republic of China
Summary This standard specifies the terms and symbols, classification and grade, requirements, test methods, inspection rules, marking, storage and transportation of aggregates for high-performance concrete. This standard applies to aggregates used in the preparation of high-performance concrete in construction projects, excluding special aggregates such as light aggregates and heavy aggregates.

JG/T 568-2019: Aggregate for high performance concrete

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Aggregate for high performance concrete Longling County Jiangteng Volcanic Ash Development Co., Ltd. standard Q/LJT Pozzolanic powder used in concrete (mortar) 2007-09-01 released 2007-09-15 Implementation The People's Republic of China Construction Industry Industry Standard Aggregate for high performance concrete Issued by the Ministry of Housing and Urban-Rural Development of the People's Republic of China ICS 91.100.99 Q 13

Table of contents

Foreword...I 1 Scope...1 2 Normative references...1 3 Terms and symbols...1 4 Classification and classification...3 5 Requirements...3 6 Test method...6 7 Inspection rules...8 8 Marking, storage and transportation...8 Appendix A (Normative Appendix) Test Method for Irregular Particle Content of Coarse Aggregate...10 Appendix B (Normative Appendix) Test method for artificial sand flake particle content...12 Appendix C (Normative Appendix) Stone Powder Methylene Blue Value Test...14 Appendix D (Normative Appendix) Stone Powder Fluidity Ratio Test...16 Appendix E (Normative Appendix) Water demand ratio test of artificial sand...18 Appendix F (Normative Appendix) Chloride Content Test of Coarse Aggregate...19

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard was proposed by the Standard Rating Institute of the Ministry of Housing and Urban-Rural Development of the People's Republic of China. This standard is under the jurisdiction of the Technical Committee for Construction Engineering Quality Standardization of the Ministry of Housing and Urban-Rural Development of the People's Republic of China. The organization responsible for drafting this standard. China Academy of Building Research Co., Ltd. Participated in the drafting of this standard. Beijing Jianzhu University, China Water Resources and Hydropower Eighth Engineering Bureau Co., Ltd., Southwest Communications University, Yellow River Survey, Planning and Design Institute Co., Ltd., Shanghai Institute of Building Research, Guangdong Changda Highway Project Co., Ltd., China Building Materials Inspection and Certification Group Guizhou Co., Ltd., Shenzhen Antuoshan Concrete Co., Ltd., Baoding Sheng Tuo Building Materials Processing Co., Ltd., Huzhou Xinkaiyuan Crushed Stone Co., Ltd., Chongqing Construction Engineering Seventh Construction Engineering Co., Ltd., Bijie Shuangshan Development Zone Panshi Building Material Co., Ltd., Shenzhen Bingcheng Building Material Technology Co., Ltd., Shandong Province Building Science Research Institute, Wuhan University of Technology, Guizhou Jinhai Panshi Industrial Co., Ltd., Tongji University. The main drafters of this standard. Zhou Yongxiang, Gao Chao, Song Shaomin, Leng Guangfa, He Yang, Tian Chengyu, Li Guhua, Zhu Dong Min, Zhang Jinliang, Yao Lijun, Li Beixing, Luo Chaoyun, Zhang Guihong, Yao Shaowu, Gao Fangsheng, Wei Zengjun, Deng Shimeng, Xiong Hao Dong, Li Fei, Xia Jingliang, Wu Daoyi, Yao Yifan, Wang Yongwei, Wang Jing, Wang Zuqi, Jiang Zhengwu, Chen Xueli, Wang Yong Hai, Zhang Lei, Song Putao, Wang Wei, Zhou Zhi. Aggregate for high performance concrete

1 Scope

This standard specifies the terms and symbols, classification and grades, requirements, test methods, and inspections of aggregates for high-performance concrete Rules, signs, storage and transportation, etc. This standard applies to aggregates used in the preparation of high-performance concrete in construction projects, excluding special bones such as light aggregates and heavy aggregates. material.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version is suitable Used in this document. For undated references, the latest version (including all amendments) applies to this document. GB 175 General Portland Cement GB/T 601 Preparation of Standard Titration Solution for Chemical Reagents GB/T 602 Preparation of standard solutions for impurity determination in chemical reagents GB/T 2419 Method for measuring fluidity of cement mortar GB 6566 Radionuclide limits for building materials GB 8076 concrete admixture GB/T 14684 Sand for construction GB/T 14685 Pebble and gravel for construction GB/T 17671 Cement Mortar Strength Inspection Method (ISO Method) GB/T 50733 Technical code for preventing concrete alkali aggregate reaction JG/T 223 Polycarboxylic acid series high performance water reducer

3 Terms and symbols

The following terms and symbols apply to this document. 3.1 Terminology 3.1.1 high performance concrete Taking the specific requirements of concrete performance in construction engineering design and construction as the overall goal, selecting high-quality conventional raw materials, and reasonable Add admixtures and mineral admixtures, use a lower water-to-binder ratio and optimize the mix ratio, adopt green ready-mix production methods and strict The construction measures to make concrete with excellent mixture performance, mechanical properties, long-term performance and durability. 3.1.2 aggregate Granular loose materials such as rock particles that play the role of skeleton, filling and stabilizing volume in concrete. 3.1.3 Coarse aggregate (stone) Rock particles larger than 4.75mm in size, including pebbles and gravel. 3.1.4 Pebble Rock particles with a particle size greater than 4.75mm formed by natural weathering, water flow handling, sorting, and accumulation. JG/T ***-20** 3.1.5 crushed stone Rocks, pebbles, mine tailings that have not been treated by chemical methods are removed, mechanically crushed, reshaped, sieved, and powdered Rock particles with a particle size greater than 4.75mm, which are made by control and other processes. 3.1.6 Elongated flaky particle Pebble and crushed stone particles whose length is greater than 2.4 times the average particle size of the corresponding particle size of the particle are needle-shaped particles; Those smaller than 0.4 times the average particle size are flaky particles. 3.1.7 Irregular particle in coarse aggregate The smallest one-dimensional size of pebble and crushed stone particles is less than 0.5 times the average particle size of the corresponding particle size. 3.1.8 fine aggregate (sand) fine aggregate Rock particles with a particle size of less than 4.75mm, including natural sand and artificial sand. 3.1.9 natural sand Naturally formed, artificially mined and sieved rock particles with a particle size of less than 4.75mm, including river sand, lake sand, mountain Sand, desalinated sea sand, but does not include soft, weathered rock particles. 3.1.10 artificial sand Including machine-made sand and mixed sand. 3.1.11 machine-made sand Rocks, pebbles, and mine tailings that have not been treated by chemical methods are removed, mechanically crushed, reshaped, screened, and powder controlled Rock particles with a particle size of less than 4.75mm produced by other processes, but excluding soft and weathered rock particles. 3.1.12 mixed sand Sand made by mixing natural sand and machine-made sand in a certain proportion. 3.1.13 Flaky particle in artificial sand The smallest one-dimensional size of artificial sand particles with a particle size of 1.18mm or more is smaller than the average particle size of the corresponding particle size of the particle 0.45 times the particles. 3.1.14 Sediment percentage The content of particles smaller than 75μm in natural sand, pebbles and crushed stones. 3.1.15 rock fines content The artificial sand has a particle content of less than 75μm. 3.1.16 methylene blue number of rock fines (MB value) An index used to determine the adsorption performance of stone powder. 3.1.17 fluidity ratio of rock fines Under the condition of adding additives and 0.4 water-to-binder ratio, the fluidity ratio of the mortar mixed with stone powder to the standard cement mortar is used It is an index for judging the adsorption performance of stone powder to water reducing agent. JG/T ***-20** 3.1.18 Water requirement of artificial sand The ratio of water consumption between artificial sand and Chinese ISO standard sand under the specified fluidity deviation of cement mortar, used for comprehensive judgment The index of artificial sand gradation, particle shape, water absorption and stone powder adsorption performance. 3.2 Symbols See Table 1 for symbols and meanings. Table 1 Symbols and meanings

4 Classification and grade

4.1 Classification Coarse aggregate (stone) is divided into pebbles and gravel. Fine aggregate (sand) is divided into natural sand and artificial sand. Artificial sand includes machine-made sand and mixed sand. 4.2 grade Fine aggregates and coarse aggregates are divided into special grade and I grade according to technical requirements.

5 requirements

5.1 General requirements 5.1.1 The radioactivity of the aggregate should meet the requirements of GB 6566. 5.1.2 For coarse and fine aggregates produced from mine waste rock, hazardous substances shall not only meet the requirements of 5.2 and 5.3, but also National environmental protection and safety related regulations shall not have harmful effects on human body, biology, environment and concrete. 5.1.3 Alkali-aggregate reactivity The aggregate used for concrete should be tested for alkali activity and should meet the technical requirements of GB/T 50733. 5.2 Technical requirements for coarse aggregate 5.2.1 Coarse aggregate grading The supplier shall sell according to the single-grain grade, and the demander shall store it according to the single-grain grade. The coarse aggregate particle gradation should conform to the regulations in Table 2. set. The maximum particle size of coarse aggregate can be enlarged as required. 5.2.2 Technical requirements The technical requirements for coarse aggregate should meet the requirements of Table 3. 5.3 Technical requirements for fine aggregate 5.3.1 The fine aggregate particle gradation should meet the requirements of Table 4, and the fineness modulus should be 2.3~3.2.The fine aggregate particle gradation allows one The sieve residue of each particle size (excluding 4.75mm and the bottom of the sieve) may be slightly exceeded, but should not be greater than 5%. When the stone powder methylene blue value When MBF >6.0, the sum of 0.15mm artificial sand and sieve bottom should not exceed 25%. 5.3.2 Technical requirements 5.3.2.1 The stone powder content of artificial sand shall meet the following requirements. a) When the methylene blue value of stone powder MBF >6.0, the content of stone powder (by mass) should not exceed 3.0%; b) When the stone powder methylene blue value MBF>4.0, and the stone powder fluidity ratio FF< 100%, the stone powder content (by mass) is not Should exceed 5.0%; c) When the stone powder methylene blue value MBF >4.0, and the stone powder fluidity ratio FF≥100%, the stone powder content (by mass) should not be More than 7%; d) When the stone powder methylene blue value MBF≤4.0 and the stone powder fluidity ratio FF≥100%, the stone powder content (by mass) should not be More than 10%; e) When the stone powder methylene blue value MBF≤2.5 or the stone powder fluidity ratio FF≥110%, according to the use environment and purpose, and Tests have verified that the content of stone powder (by mass) can be appropriately relaxed through negotiation between the supplier and the buyer, but it should not exceed 15%. 5.3.2.2 Other technical requirements for fine aggregates shall meet the requirements of Table 7.

6 Test method

6.1 Sample, test environment, test sieve and particle grading The sample, test environment, test sieve and particle grading of fine aggregate and coarse aggregate shall be in accordance with GB/T 14684 and GB/T respectively The sand fineness modulus shall be carried out according to the regulations of GB/T 14684. 6.2 Content of coarse aggregate needles and flake particles According to GB/T 14685. 6.3 Irregular particle content of coarse aggregate Follow Appendix A. 6.4 The content of fine aggregate flake particles Follow Appendix B. 6.5 Mud content, mud content The mud content and sludge content of fine aggregate and coarse aggregate shall be carried out according to the regulations of GB/T 14684 and GB/T 14685 respectively. JG/T ***-20** 6.6 Stone powder content The stone powder content of artificial sand is carried out according to the stone powder content test method in GB/T 14684. 6.7 Stone powder methylene blue value Follow Appendix C. 6.8 Stone powder fluidity ratio Follow Appendix D. 6.9 Water demand ratio of artificial sand Follow Appendix E. 6.10 Robustness The firmness of fine aggregate and coarse aggregate shall be carried out according to the regulations of GB/T 14684 and GB/T 14685 respectively. 6.11 crush index The crushing value of artificial sand and coarse aggregate shall be carried out according to the regulations of GB/T 14684 and GB/T 14685 respectively. 6.12 Apparent density, loose bulk density and loose bulk porosity The apparent density, loose bulk density, and loose bulk porosity of fine aggregate and coarse aggregate are according to GB/T 14684 and According to GB/T 14685. 6.13 Organic matter, sulfide and sulfate content The organic matter, sulfide and sulfate content of fine aggregate and coarse aggregate are in accordance with GB/T 14684 and GB/T 14685 respectively. Definitely proceed. 6.14 Mica, light matter The mica and light substances of fine aggregate shall be carried out in accordance with the regulations of GB/T 14684. 6.15 Chloride content The chloride content of fine aggregate shall be in accordance with the provisions of GB/T 14684; the chloride content of coarse aggregate shall be in accordance with the provisions of Appendix F get on. 6.16 Water absorption The dry water absorption rate of the saturated surface of the fine aggregate and the water absorption rate of the coarse aggregate are respectively in accordance with the provisions of GB/T 14684 and GB/T 14685 get on. 6.17 Rock compressive strength The compressive strength of crushed rock shall be carried out in accordance with the provisions of GB/T 14685. 6.18 Shell The test of shell content in sea sand shall be carried out in accordance with the provisions of GB/T 14684. 6.19 Moisture content JG/T ***-20** The moisture content of fine aggregate and coarse aggregate shall be carried out according to the regulations of GB/T 14684 and GB/T 14685 respectively.

7 Inspection rules

7.1 Inspection classification 7.1.1 Factory inspection 7.1.1.1 The factory inspection items of natural sand include particle size distribution, mud content, mud content, and loose accumulation porosity. 7.1.1.2 The factory inspection items of artificial sand include particle gradation, flake particle content, stone powder content (including stone powder methylene blue value and Stone powder fluidity ratio), mud content, loose accumulation porosity. 7.1.1.3 The factory inspection items of coarse aggregate include the content of irregular coarse aggregate particles, the content of needle-like particles, particle gradation, and Mud volume and mud content inspection. 7.1.2 Type inspection The type inspection items of fine aggregate include all items specified in 5.1 and 5.3.The alkali-aggregate reaction activity is based on user needs The type inspection items of coarse aggregate include all items specified in 5.1 and 5.2.The alkali-aggregate reaction activity is based on user needs. To proceed. Type inspection should be carried out when fine aggregate and coarse aggregate have one of the following conditions. a) When the new product is put into production; b) When the source of raw materials or production process changes; c) During normal production, once a year; d) When production is resumed after the suspension of production for more than 6 months; e) When there is a big difference between the result of the factory inspection and the result of the last type inspection. 7.2 Batching rules According to the same classification, category (coarse aggregate also includes nominal size) and daily output, every.2000t is a batch, and less than.2000t is also It is a batch; if the daily output exceeds 10000t, every 4000t is a batch, and if it is less than 4000t, it is also a batch. 7.3 Judgment rules 7.3.1 When the test results meet the corresponding category and level judgment of this standard, the batch of products can be judged as qualified. 7.3.2 If there is an inspection index that does not meet the standard requirements, double sampling should be taken from the same batch of products, and the item should be re-inspected. After re-inspection, if the test results meet the standard requirements, the batch of products can be judged as qualified; if it still does not meet the standard requirements, otherwise Judged as unqualified. If there are two or more test results that do not meet the standard requirements, the batch of products will be deemed unqualified. 8 Marking, storage and transportation 8.1 When fine aggregate and coarse aggregate leave the factory, both the supplier and the demander shall check and accept the product in the factory, and the manufacturer shall provide the product quality certificate. The following should be included. a) The category, grade and manufacturer information of fine aggregate and coarse aggregate. Coarse aggregate also includes the nominal particle size; b) Batch number and supply quantity; c) Factory inspection result, date and implementation standard number; d) Certificate number and issuance date; e) Signature of inspection department and inspector. 8.2 Fine aggregates should be stacked and transported separately according to classification and grade. Coarse aggregates should be stacked and transported according to classification, grade and nominal size. JG/T ***-20** Transportation to prevent man-made rolling, mixing and contamination of products. 8.3 During transportation, there should be necessary anti-spattering facilities and should not pollute the environment. Appendix A (Normative Appendix) Test Method for Irregular Particle Content of Coarse Aggregate A.1 Scope This appendix specifies the test method for the irregular particle content of coarse aggregate. A.2 Instruments The equipment should meet the following requirements. a) Blast drying oven. can control the temperature at (105±5)℃; b) Bar screen. the inner diameter of the screen frame is 300mm, the screen hole size is 3.6mm*30mm, and the spacing is 2.5mm, 6.4mm*40mm, pitch 3.0mm, 8.8mm*40mm, pitch 4.0mm, 11.4mm*50mm, pitch 5.0mm, 14.5mm*50mm, pitch 6.0mm. The schematic diagram of the bar screen is shown in Figure A.1; Figure A.1 Schematic diagram of a bar screen with a mesh size of 3.6mm*30mm and a spacing of 2.5mm c) Square hole sieve. the aperture is 2.36mm, 4.74mm, 9.50mm, 16.0mm, 19.0mm, 26.5mm, 31.5mm One sieve for each with a sieve bottom and a sieve cover (the inner diameter of the sieve frame is 300mm); d) Electric shaker; e) Balance. the range is not less than.2000g, and the sensitivity is not more than 1g; f) Enamel basins, brushes, etc. A.3 Test procedure A.3.1 Carry out sampling according to GB/T 14685, and dry the coarse aggregate. A.3.2 Take.2000g of dried coarse aggregate, and pour the coarse aggregate into a square hole sieve set from top to bottom according to the aperture size (with sieve On the bottom), the square-hole sleeve sieve is placed on the shaker, and then sieved. The coarse aggregate is divided into 5 particle size areas. 4.75 mm～9.5mm, 9.5 mm～16.0mm, 16.0 mm～19mm, 19 mm～26.5mm and 26.5 mm～31.5mm. A.3.3 Divide the particle size area from 4.75 mm to 9.5 mm, 9.5 mm to 16.0 mm, 16.0 mm to 19.0 mm, 19 mm to 26.5 mm, The coarse aggregates of 26.5mm～31.5mm are put into strips with widths of 3.6mm, 6.4mm, 8.8mm, 11.4mm, and 14.5mm respectively. Perform sieving on the sieve separately, weigh the mass of the particles under each strip sieve, and add up to obtain the total mass G of the irregular particles. A.4 Calculation of irregular particle content of coarse aggregate B.3 Test procedure B.3.1 Carry out sampling according to GB/T 14684, and dry the artificial sand. B.3.2 Take 500g of artificial sand that has been cooled to room temperature after drying, and pour the artificial sand into a square hole sleeve combined from top to bottom according to the pore size On the sieve (with the bottom of the sieve), the square-hole sleeve sieve is placed on the shaker, and then sieved. The artificial sand is divided into 3 particle size areas. 1.18 mm~ 2.36mm, 2.36 mm～4.75mm, 4.75 mm～9.50mm. B.3.3 Place the fine aggregates of 1.18 mm～2.36mm, 2.36 mm～4.75mm, 4.75 mm～9.50mm in the particle size zone respectively Into the strip sieve with widths of 0.8mm, 1.6mm, 3.2mm for sieving respectively, weigh the mass of the particles under each strip sieve, and The total mass G of artificial sand flake particles is obtained by accumulation. B.4 Calculation of artificial sand flake particle content B.4.1 The artificial sand flake particle content is calculated according to formula (B.1), accurate to 1%. Appendix C (Normative Appendix) Stone Powder Methylene Blue Value Test C.1 Scope This appendix specifies the test method for methylene blue value of stone powder. C.2 Instruments The equipment should meet the following requirements. a) Methylene blue (C16H18CIN3S·3H2O). the purity is not less than 98.5%; b) Blast oven. the temperature control range is (105±5)℃; c) Balance. weigh 1000g with a sense of 1g; weigh 100g with a sense of 0.01g. d) Square hole sieve. diameters of 75μm, 150μm, 300μm, 600μm, 1.18mm, 2.36mm, 4.75mm One sieve, with a bottom and cover (the inner diameter of the sieve frame is 300mm); e) Shaker; f) Pipette. 5mL and 2mL pipettes each; g) Impeller agitator. The speed can be adjusted up to (600±60) r/min, the number of impellers is three or four, and the impeller diameter (75±10)mm; h) Timing device. accuracy 1s; i) Glass volumetric flask. 1L in capacity; j) Thermometer. accuracy 1℃; k) Glass rods. 2 pieces, diameter 8mm, length 300mm; l) Beaker. the capacity is 1000mL; m) Others. quantitative filter paper, enamel tray, brush, clean water, etc. C.3 Test procedure C.3.1 Preparation of standard methylene blue solution [(10.0±0.1) g/L standard concentration] C.3.1.1 Determine the water content w in methylene blue. Weigh about 5g of methylene blue powder and record the mass mh to the nearest 0.01g. Dry to constant weight at a temperature of 100℃±5℃ (if the drying temperature exceeds 105℃, the methylene blue powder will deteriorate). Cool in the container, then weigh, record the mass mg, accurate to 0.01g. Calculate the water content w of methylene blue according to formula (C.1). Note. Before each preparation of methylene blue solution, the water content of methylene blue should be determined first. C.3.1.2 Take methylene blue powder (100 w) (10g±0.01g)/100 (that is, the mass of methylene blue powder is 10g), accurate to 0.01g. C.3.1.3 Heat a beaker containing about 600 mL of clean water, and the water temperature should not exceed 40°C. C.3.1.4 Add the methylene blue powder while stirring, continue stirring for 45 minutes, until the methylene blue powder is completely dissolved, then cool But to 20 ℃. C.3.1.5 Pour the solution into a 1L volumetric flask, rinse the beaker with clean water, etc., so that all the methylene blue solution is transferred into the volumetric flask. The temperature of the volumetric flask and the solution should be maintained at (20±1)℃, and add clean water to the 1L mark of the volumetric flask. C.3.1.6 Shake the volumetric flask to ensure that the methylene blue powder is completely dissolved. Transfer the standard solution into the dark storage bottle, methylene blue standard The shelf life of the solution should not exceed 28 days. The prepared solution should be marked with the preparation date and expiration date, and stored in the dark. C.3.2 Preparation of stone powder suspension C.3.2.1 Carry out sampling according to GB/T 14684 and dry the artificial sand. C.3.2.2 Pour the artificial sand sample that has been dried and cooled to room temperature into a set of sieve combined from top to bottom according to the aperture size (with 75μm sieve attached) And the bottom of the sieve), sieve with a shaker for 10 minutes, take a total of 100g of the bottom stone powder sample below the 75μm square hole sieve, and divide it into two for use. Accurate to 0.1g. C.3.2.3 Weigh 50g of stone powder sample, accurate to 0.1g. Pour the stone powder sample into a beaker containing (500±5) mL distilled water Adjust the impeller mixer to (600±60) r/min ro...

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