GB/T 18736-2017Mineral admixtures for high strength and high performance concrete (English PDF)

Foreword

This standard is drafted in accordance with the rules given in GB/T 1.1-2009.

This standard replaces GB/T 18736-2002 "mineral admixture for high strength and high performance concrete".

This standard compared with GB/T 18736-2002 main technical changes are as follows.

- the addition of metakaolin mineral admixtures to the scope of this standard, "ground fly ash" to "fly ash" (see Chapter 1, 2002 Edition Chapter 1);

- the definition of ground fly ash is removed, the definition of fly ash is increased (see Chapter 3, Chapter 3 of 2002);

--- increased the definition of metakaolin (see Chapter 3);

- the definition of granulated blast furnace slag, ground slag, silica fume, natural zeolite rock, ground natural zeolite, compound mineral admixture 2002 edition of chapter 3);

- modified the grading of ground slag, abolished the classification of fly ash, ground natural zeolite (see Chapter 4, 2002, Chapter 4);

- increased technical requirements for metakaolin mineral admixtures (see Chapter 5);

--- will be grinding slag, fly ash, grinding natural zeolite chloride control value from "<= 0.02%" to "<= 0.06%", the silica fume The chloride ion control value is changed from "<=0.02%" to "<=0.10%" (see Chapter 5, Edition 2002, Chapter 5);

- a free calcium oxide test project with fly ash added (see Chapter 5);

--- The fineness test project has been added, and the fineness test items include the specific surface area and the 45 µm square hole sieve (see Chapter 5);

- adjust the control value of the mineral admixture water requirement ratio (see Chapter 5, Chapter 5 of 2002);

- adjust the control value of the mineral admixture activity index (see Chapter 5, Chapter 5 of 2002);

- modified test methods for chloride ions (see Chapter 6, Chapter 2, 2002);

- modified the silica test method, abolished the 2002 version of Appendix A silica content analysis method (see Chapter 6, 2002, Chapter 6, Appendix A);

The method of measuring the specific surface area of the laser particle size analyzer was canceled. The specific surface area of the ground slag was determined according to GB/T 8074 (See Chapter 6, Chapter 2, 2002);

- an increase of 45 µm square hole sieve test method (see Chapter 6);

- modified test method for moisture content, added to Appendix B, "Method for determination of moisture content of mineral admixtures" (see Chapter 6, Appendix B, 2002, Chapter 6);

- Modification of the activity index test method (see Chapter 6, Appendix C, 2002, Chapter 6, Appendix C);

--- "pocket net weight of each bag shall not be less than 98% of the quality of the logo" to "pocket net weight of each bag shall not be less than the quality of the logo 99%" (see Chapter 8, Chapter 9, 2002).

1 Scope

This standard specifies the terms and definitions, classification and marking of mineral admixtures for high strength and high performance concrete, requirements, test methods, inspection regulations, packaging, marking, transportation and storage.

This standard applies to high strength and high performance concrete grinding slag, fly ash, ground natural zeolite, silica fume and metakaolin and its composite mineral admixtures.

2 Normative reference documents

The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this document. For undated references, the latest edition (including all modifications) applies to this document.

Methods for chemical analysis of cement

GB/T 1345 Test method for fineness of cement - Sieve method

GB/T 2419 Determination of fluidity of cement mortar

GB/T 5483 Natural gypsum

GB/T 8074 Determination of specific surface area of cement

Classification, classification, naming and terminology of concrete admixtures

Concrete admixtures GB 8076-2008

GB 9774 cement bags

GB/T 12573 Cement Sampling Method

GB/T 17671-1999 Test method for strength of cement mortar (ISO method)

Determination of specific surface area of solid matter by gas adsorption BET method

GB/T 26748 cement grinding aids

3 Terms and definitions

The following definitions and definitions as defined in GB/T 8075 apply to this document.