This file is based on GB/T1.1-2020 Standardization Guidelines Part 1: Rules for the structure and drafting of standardization Documents

起草。

This document replaces GB175-2007 "General Purpose Portland Cement" as compared to GB175-2007 except for structural adjustments and editorial changes

In addition, the main technological changes are as follows:

a) The requirements for cement composition have been changed (see 5.1,2007 version 5.1);

b) The requirement of "secondary (including) or more" for natural gypsum has been deleted (see 5 of the 2007 edition).2.2.1);

c Changed the technical requirements for granulated blast furnace slag or granulated blast furnace slag powder, fly ash, volcanic ash mixture (see 5.2.3、

5.2.4 和5.2.5,2007 version 5.2.3);

d) The provision for "active mixed materials" and "inactive mixed materials" has been deleted (see 5 of the 2007 edition.2.3、5.2.4);

e) Changed the requirements for limestone and sandstone and increased the test method for methylene blue values (see 5.2.6,2007 version 5.2.4);

f) The "kiln ash" material has been removed (see 5 of the 2007 edition.2.5);

g) The 32 of composite Portland cement was deleted.5、32.5R strength rating (see 6 for the 2007 version).3);

h) Increased limits and methods for determination of water-soluble chromium (V) (see 7.2和8.3);

i) The requirements for low-alkali cement have been changed (see 7.3,2007 version 7.2);

j) Added the requirement of autoclavation stability and listed it as a type inspection item (see 7.4.2.2、9.2.2);

k) The 3d compressive strength index of each strength grade of cement has been changed (see 7.4.3,2007 version 7.3.3);

l Changed fineness requirements (see 7.4.4,2007 version 7.3.4);

m) Increased limits and methods of determination of radionuclides in cement (see 7.5和8.9);Gangge wechat 11948660

n) Changed component determination requirements (see 8.1,2007 version 8.1);

o) The provision for production capacity below 10X10*t in "Numbering and sampling" has been deleted (see 2007 edition 9.1);

p) Changed the factory inspection items (see 9.2.1,2007 version 9.3);

q) Requirements for type inspection and inspection frequency and rules for determination have been added (see 9.2.2、9.3.2);

r) Increased requirements for product quality certification materials (see 9.4);

s) changed the requirements of the inspection report (see 9.5,2007 version 9.5);

t) The provisions on which acceptance is based have been changed (see 9.6.1,2007 version 9.6.1);

u) Changes to the regulations of inspection bodies in the event of quality disputes (see 9.6.2、9.6.3. 2007 version 9.6.2、9.6.3);

v) The packing regulations have been changed (see 10.1. 10 for the 2007 edition.1)。

The electro-hydraulic servo press and the electronic compression and folding testing machine can be matchedThe compressive strength of Portland cement was tested。