GB/T 4111-2026Test methods for concrete blocks and bricks (English PDF)

3 Terms and definitions

4 Appearance quality

5 Dimensions and dimensional deviations

6 Flexural strength

7 Compressive strength

8 Density and percentage of voids

9 Moisture content, water absorption and relative moisture content

10 Linear drying shrinkage

11 Softening coefficient

12 Carbonation coefficient

13 Frost resistance

14 Permeability coefficient of the wall blocks

15 Permeability of the concrete blocks

16 Impermeability of the concrete blocks

17 Test report

Foreword

This document was issued on 2 July 2026 by the State Administration for Market Regulation and the Standardization Administration of the People's Republic of China, and takes effect on 1 February 2027.

It replaces GB/T 4111-2013, which remains in force until that date.

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

Classification: ICS 91.100.01, CCS Q 10.

3 Classification and status

GB/T 4111-2026 is classified under ICS 91.100.01, 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 10. 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.