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JG/T 573-2020Recycled fine powder used in concrete and mortar (English PDF)

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Issued by

Ministry of Housing and Urban-Rural Development of the People's Republic of China

Level / Type

National · Recommended

Issue date

January 13, 2020

Implementation date

August 1, 2020

Scope

JG/T 573-2020 (Recycled fine powder used in concrete and mortar) is available as an English-translated PDF.

JG/T 573-2020 — This standard specifies the terms and definitions, classification and marking, requirements, test methods, inspection rules, packaging and marking, storage and transportation.

This standard applies to the recycled micropowder used as admixture when preparing concrete, mortar and their products.

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Document preview — JG/T 573-2020

National Standard of the People's Republic of China

ICS: 91.100.10
Classification: Q 12

Issued by: Ministry of Housing and Urban-Rural Development of the People's Republic of China

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Classification and marking
5 Requirements
6 Test method
7 Inspection Rules
8 Packaging and marking
9 Storage and transportation
Appendix A (normative appendix) Determination of the water requirement ratio and fluidity change over time of 2h of recycled micropowder
Appendix B (Normative Appendix) Determination of Activity Index of Regenerated Micropowder

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.

This standard is under the jurisdiction of the Construction Engineering Quality Standardization Technical Committee of the Ministry of Housing and Urban-Rural Development.

The organization responsible for drafting this standard. China Academy of Building Research Co., Ltd.

Participated in the drafting of this standard. Beijing Jianzhu University, Qingdao Agricultural University, Science and Technology and Industrialization Development Center of Ministry of Housing and Urban-Rural Development, Shanghai Institute of Building Research, Shenzhen Weihai Building Material Co., Ltd., Shenzhen Antuoshan Concrete Co., Ltd., Jiangsu Green and Environmental Technology Co., Ltd., Jiangxi Province Building Materials Industry Research and Design Institute, Liaoning Province Water Resources and Hydropower Research Institute Co., Ltd., Water Litong Construction (Jiang Su) Co., Ltd., Beijing Office of Building Energy Conservation and Building Materials Management, Ningbo Construction Testing Co., Ltd., Kashgar University, Beijing Construction Engineering Quality Second Inspection Institute Co., Ltd., Shougang Environmental Industry Co., Ltd., Kezhijie New Material Group Co., Ltd., Guangzhou Tiecheng Cheng Quality Inspection Co., Ltd., China Construction Second Engineering Bureau Co., Ltd., Fujian Takicheng Construction Industry Co., Ltd., Wujiang City Construction Project Quality Inspection Center Co., Ltd., Beijing Urban Construction Eight Construction Development Co., Ltd.

1 Scope

This standard specifies the terms and definitions, classification and marking, requirements, test methods, inspection rules, packaging and marking, storage and transportation.

This standard applies to the recycled micropowder used as admixture when preparing concrete, mortar and their products.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version is suitable for this document, the latest version (including all amendments) of the undated reference documents is applicable to this document.

GB/T 176 Cement chemical analysis method GB/T 1345 Cement Fineness Inspection Method Sieve Analysis Method GB/T 1346 Cement standard consistency, water consumption, setting time, and stability test method GB/T 1596 Fly ash used in cement and concrete GB/T 2419 Method for determination of fluidity of cement mortar GB 6566 Radionuclide limits for building materials GB/T 9774 cement packaging bag GB/T 12573 Cement sampling method GB/T 17671 Cement mortar strength inspection method (ISO method) GB/T 30190 Limestone Powder Concrete

3 Terms and definitions

The following terms and definitions apply to this document.

3.1 Recycled fine powder

The particle size accompanying the use of construction waste with concrete, bricks and tiles as the main components to prepare recycled aggregate is less than 75µm particles.

4 Classification and marking

4.1 Classification

Regenerated micropowder is divided into grade I and grade II.

4.2 Marking

4.2.1 Marking method

The mark of recycled micropowder is composed of three parts. recycled micropowder product code, classification code and standard code. Expressed as follows.

4.2.2 Example

Grade II recycled powder is marked as.

5 Requirements

5.1 The technical indicators of recycled micropowder should meet the requirements of Table 1.

5.2 The alkali content in the regenerated micropowder should be expressed as the calculated value of Na2O+0.658K2O. When there is alkali content in the application of recycled powder when restricting requirements, both parties negotiate and determine.

5.3 The radionuclide limit of regenerated micropowder shall meet the regulations of GB 6566.

6 Test method

6.1 Fineness

According to the 45µm negative pressure sieve analysis method in GB/T 1345.

6.2 Water demand ratio and fluidity change over time in 2h

Follow the provisions of Appendix A.

6.3 Activity index

Follow the provisions of Appendix B.

6.4 MB Value of Methylene Blue

According to the provisions of GB/T 30190.

6.5 Stability

Product code (RFP)

Classification code. Class I is I, Class II is II According to the provisions of GB/T 1346.

6.6 Water content

According to the provisions of GB/T 1596.

6.7 Chloride ion content, sulfur trioxide content, alkali content

According to the provisions of GB/T 176.

6.8 Radioactivity

According to the provisions of GB 6566.

7 Inspection rules

7.1 Number

The regenerated powder is numbered and sampled at the same level before leaving the factory. Bulk recycled micropowder and bag recycled micropowder should be compiled separately Number and sampling. No more than 50t is a number.

7.2 Sampling

7.2.1 Each number is a sampling unit.

7.2.2 The sampling method shall be carried out according to GB/T 12573.Sampling should be representative, and samples should be taken from more than 10 different locations. Bagged Recycled micropowders should be taken from more than 10 packaging bags in an equal amount, each not less than 1.0kg; bulk recycled micropowders should be taken from an equal amount of samples shall be taken from each bulk transport container. Each bulk transport container shall take an equal amount of samples from different depths.

Less than 10kg. After the samples are evenly mixed, take out a sample that is more than twice the amount required for the test according to the quarter method.

7.2.3 The test samples should be kept and sealed for at least 6 months. When there is a dispute, re-inspection or arbitration inspection shall be conducted on the retained samples.

7.3 Factory inspection

The factory inspection items include the fineness, water requirement ratio, activity index, methylene blue MB value and stability in Table 1.

7.4 Type inspection

7.4.1 Type inspection items include all the requirements in Table 1.

7.4.2 In one of the following situations, type inspection shall be carried out.

a) The production process has changed;

b) During normal production, inspect once every 6 months;

c) When production is resumed after stopping production for more than 3 months;

d) When there is a level difference between the factory inspection result and the last type inspection result.

7.5 Judgment rules

7.5.1 When the factory inspection meets the factory inspection requirements of this standard, the factory inspection is deemed qualified. If any of them do not meet when required, re-sampling in the same batch is allowed, and the unqualified items are doubled for retesting. When the re-inspection results are all qualified, the factory inspection is judged as qualified; when there is still a group of test results that do not meet the requirements, the factory inspection is judged as unqualified.

7.5.2 When the type inspection meets the type inspection requirements of this standard, the type inspection is judged as qualified. If any of them do not meet when required, re-sampling in the same batch is allowed, and the unqualified items are doubled for retesting. When the re-inspection results are all qualified, it is judged as qualified for type inspection; when there is still a group of test results that do not meet the requirements, it is judged as unqualified for type inspection.

8 Packaging and marking

8.1 Packaging

Recycled powder can be packed in bulk or bag. The net mass of each bag is 50 kg or 25 kg, and should not be less than 98% of the marked mass.

Recycled micro powder packaging bags should meet the requirements of GB/T 9774.Other packaging specifications can be negotiated between the buyer and the seller.

8.2 Sign

The packaging bag of recycled micropowder should clearly indicate the product name, grade, batch number, implementation standard number, manufacturer name and location.

Address, net quality, production date and factory number.

In bulk, a card with the same content as the bag label should be submitted.

9 Storage and transportation

Recycled powder should not be damp or mixed with debris during storage and transportation, and environmental pollution should be prevented at the same time.

Appendix A

(Normative appendix) Determination of water requirement ratio and fluidity of regenerated micropowder over time in 2h A.1 Main equipment and materials A.1.1 The test equipment specified in GB/T 17671 should be used for the test.

A.1.2 The cement used in the test shall be the cement standard sample or the cement agreed in the contract in accordance with GSB14-1510 strength inspection. When there is in disputes or arbitration inspections, cement standard samples for strength inspections in accordance with GSB14-1510 shall be used.

A.1.3 The test sand should conform to the standard sand specified in GB/T 17671.

A.1.4 The test water should be tap water or distilled water. When there is a dispute, distilled water should be used.

A.2 Test conditions and methods A.2.1 The laboratory should meet the requirements of GB/T 17671.

A.2.2 The mix ratio of mortar to determine the water demand ratio shall meet the requirements of Table A.1.

Table A.1 Mix ratio of mortar

Type of mortar Cement (g) Recycled fine powder (g) ISO sand (g) Water addition (g) Fluidity (mm) Contrast mortar 450±2-1350±5 225±1 L0 Tested mortar 315±1 135±1 1350±5 W L0±2mm A.2.3 Stir the mortar according to GB/T 17671.

A.2.4 Test and calculation of water demand ratio of regenerated micropowder A.2.4.1 Determine the fluidity according to the mortar mix ratio specified in Table A.1 and the method specified in GB/T 2419, and determine the contrast rubber separately the fluidity of the sand and the tested mortar. When the tested mortar fluidity reaches the contrast mortar fluidity (L0) ± 2mm, record this time the amount of water added W and the fluidity of the tested mortar L0; when the fluidity of the tested mortar exceeds the fluidity of the contrast mortar (L0) ± 2mm when the time, readjust the amount of water added until the tested mortar fluidity reaches the contrast mortar fluidity (L0) ± 2mm, record this Hourly add water W and tested mortar fluidity L1.

A.2.4.2 The water demand ratio of regenerated micropowder is calculated according to formula (A.1), and the result should be accurate to 1%.

A.2.5 Test and calculation of the fluidity of regenerated micropowder over time in 2h A.2.5.1 When the fluidity of the tested mortar reaches L1, prepare a sample according to the same mortar mix ratio and put it in and wipe it with a wet cloth in the passed sample cylinder, cover the container, let it stand for 2h (calculated from the time of adding water and stirring), then pour it out according to GB/T 2419 regulations Determine the fluidity by a predetermined method, and record the fluidity L2 of the tested mortar at this time.

A.2.5.2 The fluidity change of the regenerated micropowder in 2h is calculated according to formula (A.2).

Appendix B

(Normative appendix) Determination of Activity Index of Regenerated Micropowder B.1 Main equipment and materials B.1.1 The test instruments specified in GB/T 17671 should be used for the test.

B.1.2 The cement used in the test shall be the cement standard sample or the cement agreed in the contract in accordance with GSB14-1510 strength inspection. When there is in disputes or arbitration inspections, cement standard samples that comply with GSB14-1510 for strength inspection shall be used.

B.1.3 The sand used for the test should conform to the standard sand specified in GB/T 17671.

B.1.4 The test water should be tap water or distilled water. When there is a dispute, distilled water should be used.

B.2 Test conditions and methods B.2.1 The test room should meet the requirements of GB/T 17671.

B.2.2 The mix ratio of mortar to determine the activity index should meet the requirements of Table B.1.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 7 pages — is available in the English PDF.

Referenced standards

Normative references

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