GB/T 28627-2023Gypsum plaster (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 28627-2012 "Plastering Gypsum". Compared with GB/T 28627-2012, except for structural adjustments and editorial changes In addition to the dynamics, the main technical changes are as follows:

a) Changed the definition of the term "plastering gypsum" (see 3.1, 3.1 of the 2012 edition);

b) Deleted the term "surface plaster plaster" (see 3.2 of the 2012 edition);

c) "Lightweight plastering gypsum" is changed to "lightweight plastering gypsum" (see 3.2, 3.4 of the 2012 edition);

d) "Bottom plastering gypsum" is changed to "heavy plastering gypsum" (see 3.3, 3.3 of the 2012 edition);

e) Delete the term "insulation layer plastering gypsum" (see 3.5 of the 2012 edition);

f) Changed the classification and marking (see Chapter 4, Chapter 4 of the 2012 edition);

g) Changed the general requirements (see Chapter 5 of the 5.2012 edition);

h) Delete the technical requirements for fineness (see 6.1 of the 2012 edition);

i) Changed the technical requirements for water retention (see Chapter 6, 6.3 of the 2012 edition);

j) Increased calcium sulfate content, pH, radionuclide limit indicators (see Chapter 6);

k) The technical requirements for the strength of plastering gypsum on the surface layer and plastering plaster on the insulation layer are deleted (see 6.4 of the 2012 edition);

l) The technical requirements for the bulk density of the plastering gypsum for the insulation layer have been deleted (see 6.5 of the 2012 edition);

m) Delete the technical requirements for thermal conductivity (see 6.6 of the 2012 edition);

n) The water retention rate measuring device is changed to a water retention rate tester (see 7.1.9, 7.1.10 of the 2012 edition);

o) Delete the fineness test method (see 7.4.1 of the 2012 edition);

p) The water retention test method has been changed (see 7.5, 7.4.3 of the 2012 edition);

q) The test method for tensile bond strength has been changed (see 7.7.3, 7.4.4.3 of the 2012 edition);

r) Delete the thermal conductivity test method (see 7.4.6 of the 2012 edition);

s) Added calcium sulfate content, pH, radionuclide limit test methods (see 7.8, 7.9, 7.10);

t) Determination of calcium sulfate content --- drying difference method has been added (see Appendix A).

1 Scope

This document specifies the classification and marking, general requirements, technical requirements, test methods and inspection rules of plastering gypsum (also known as plastering gypsum mortar), as well as packaging, marking, transportation and storage.

This document applies to gypsum mortar plastering materials used for leveling the interior walls and ceiling bases of buildings.

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/T 1346-2011 Standard consistency water consumption, setting time and stability test method of cement

GB/T 2419 Method for Determination of Fluidity of Cement Mortar

GB/T 5484-2012 Chemical analysis methods for gypsum

GB 6566 Limits of radionuclides in building materials

GB 8624 Classification of combustion behavior of building materials and products

GB/T 9776 Building plaster

GB/T 17669.3 Determination of Mechanical Properties of Building Gypsum

GB/T 17669.4 Determination of physical properties of construction gypsum paste

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

JGJ/T 70-2009 Standard for Test Methods of Basic Properties of Building Mortar

3 Terms and Definitions

The following terms and definitions apply to this document.