GB/T 21144-2023Solid concrete brick (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules for Standardization Documents" drafting.

This document replaces GB/T 21144-2007 "Concrete Solid Brick". Compared with GB/T 21144-2007, except for structural adjustment and editing in addition to sexual changes, the main technical changes are as follows:

a) Added two strength grades of MU7.5 and MU10 (see 4.3);

b) Changed the scope of brick-making raw materials and added recycled aggregate (see 5.2, 5.3, 5.2, 5.3 of the 2007 edition);

c) The number of missing edges and corners has been increased (see 6.2);

d) Changed the index requirements for density grades (see 6.3, 6.3 of the 2007 edition);

e) Change "maximum water absorption rate" to "water absorption rate" (see 6.5, 6.5 of the 2007 edition);

f) The requirements for mass loss rate and strength loss rate after freezing have been changed, and the basis for division of areas of use has been added (see 6.7, 6.7 of the 2007 edition);

g) Increased product radionuclide limit requirements and test methods (see 6.10, 7.9);

h) The test methods for dimensional tolerances and appearance quality, compressive strength, carbonation coefficient, softening coefficient, and compressive strength after freezing have been changed (See 7.1, 7.3, 7.6~7.8, 7.1, 7.3, 7.6~7.8 of the 2007 edition);

i) Deleted Appendices A~Appendix C (see Appendices A~Appendix C of the 2007 edition).

1 Scope

This document specifies the specifications, grades, marks, raw materials, technical requirements, test methods, inspection rules, transportation and storage of solid concrete bricks. deposit, product certificate.

This document applies to the design, production, testing and application of concrete solid bricks for buildings and structures.

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.

GB 175 General Portland cement

GB/T 1596 Fly ash used in cement and concrete

GB/T 4111 Test methods for concrete blocks and bricks

GB 6566 Limits of radionuclides in building materials

GB 8076 Concrete Admixtures

GB/T 14684 Construction Sand

GB/T 14685 Pebbles and gravels for construction

GB/T 17431.1 Lightweight aggregates and their test methods Part 1: Lightweight aggregates

GB/T 18046 Granulated blast furnace slag powder used in cement, mortar and concrete

GB/T 18968 Wall Material Terminology

GB/T 25176 Recycled Fine Aggregate for Concrete and Mortar

GB/T 25177 Recycled Coarse Aggregate for Concrete

GB 50176 Code for thermal design of civil buildings

JC/T 466 Inspection rules for masonry bricks

JGJ 63 concrete water standard

YB/T 4178 blast furnace heavy slag gravel for concrete

3 Terms and Definitions

The following terms and definitions defined in GB/T 18968 apply to this document.