GB/T 31289-2025Portland cement used for ocean project (English PDF)

Foreword

This document was drafted in accordance with the rules provided in GB/T 1.1-2020 Directives for Standardization - Part 1: Rules for the Structure and Drafting of Standardizing Documents.

This document serves as a replacement for GB/T 31289-2014 Portland Cement Used for Ocean Project. In comparison with GB/T 31289-2014, apart from structural adjustments and editorial modifications, the main technical changes are as follows.

a) Classification and codes are added (see Chapter 4);

b) The requirements for fly ash content in components are modified (see 5.1; 4.1 of Version 2014);

c) The technical requirements for slag powder and fly ash are added (see 5.2.2 and 5.2.3;

4.2.2 and 4.2.3 of Version 2014);

d) The desulfurized gypsum is added (see 5.2.4.2; 4.2.4 of Version 2014);

e) The requirements for metakaolin and its content are added (see 5.1 and 5.2.5);

f) The detection method and technical indicators for chloride ion diffusion coefficient are modified (see 7.3.5 and 8.6; 6.2.5 and 7.6 of Version 2014);

g) The detection method and technical indicators for sulfate resistance are deleted (see 6.2.6 of Version 2014);

h) The requirements related to component and strength testing are modified (see 8.1 and 8.4; 7.1 and 7.5 of Version 2014);

i) The provisions on type inspection are modified (see 9.2.2; 8.2.2 of Version 2014));

j) The provisions on cement exiting-factory are added (see 9.4);

k) Inspection-related provisions in the event of quality disputes are modified (see 9.6.2 and 9.6.3; 8.5.2 and 8.5.3 of Version 2014);

l) The provisions on packaging are modified (see 10.1; 9.1 of Version 2014).

Please be noted that certain content of this document may involve patents. The issuing institution of this document does not undertake the responsibility of identifying these patents.

This document was proposed by China Building Materials Federation.

This document shall be under the jurisdiction of National Technical Committee 184 on Cement of Standardization Administration of China (SAC/TC 184).

Portland Cement Used for Ocean Project

1 Scope

This document specifies the classification and codes, composition and materials, strength grades, technical requirements, test methods, inspection rules, as well as packaging, marking, transportation, and storage of Portland cement used for ocean project.

This document applies to Portland cement used for ocean project.

2 Normative References

GB/T 176

GB/T 203

GB/T 1345

GB/T 1346

GB/T 1596

GB/T 2419

GB/T 5483

GB/T 9774

GB/T 12573

GB/T 12960

GB/T 17671

GB/T 18046

GB/T 18736

GB/T 21372

GB/T 26748

GB/T 37785

GB/T 38140

GB/T 39701

GB/T 42272

3 Terms and Definitions

The following terms and definitions are applicable to this document.

4 Classification and Codes

Based on different resistances to chloride ion penetration and seawater erosion, cement for ocean project is divided into two categories. ordinary type and high erosion-resistant type. The ordinary type is code OPO, and the high erosion-resistant type is code OPH.

5 Composition and Materials

6 Strength Grades

Cement for ocean project is classified into three strength grades. 32.5L, 32.5 and 42.5.

7 Technical Requirements