GB/T 1345-2026Methods for testing cement fineness — Sieve analysis (English PDF)

3 Terms and definitions

4 Principle of the method

5 Test instruments and laboratory environmental conditions

Foreword

This document was issued on 25 May 2026 by the State Administration for Market Regulation and the Standardization Administration of the People's Republic of China, and has been in force since 1 September 2026.

It is the first edition of this standard.

The document is under the responsibility of the China Building Materials Federation.

Classification: ICS 91.100.10, CCS Q 11.

3 Classification and status

GB/T 1345-2026 is classified under ICS 91.100.10, in the field of construction materials and building. ICS is the International Classification for Standards, the same scheme used by ISO and by the national bodies of most countries, which is what allows a Chinese standard to be placed beside its foreign counterparts on subject rather than on number.

Its Chinese Standard Classification code is CCS Q 11. CCS is the domestic scheme, a letter for the sector and two digits for the subject within it, and it is the code by which the standard is filed and searched in China.

The GB/T prefix marks a recommended national standard. It is not, in itself, law: it becomes binding when a contract names it, when a regulation or a mandatory standard refers to it, or when a producer declares conformity with it. In practice that covers most of the cases in which it will be read — a purchase specification, an inspection agreement or a certification scheme.

The document is under the responsibility of the China Building Materials Federation, which is the body that maintains it and that will answer a formal question about its interpretation.