GB/T 4111-2026 Test methods for the concrete block and brick English, Anglais, Englisch, Inglés, えいご
This is a draft translation for reference among interesting stakeholders. The finalized translation (passing through draft translation, self-check, revision and verification) will be delivered upon being ordered.
ICS
CCS
National Standard of the People's Republic of China
GB/T 4111-2026
Test methods for the concrete block and brick
混凝土砌块和砖试验方法
Issue date: 2026-02-27 Implementation date: 2026-09-01
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
the Standardization Administration of the People's Republic of China
Contents
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Appearance quality
5 Dimensions and dimensional deviations
6 Flexural strength
7 Compressive strength
8 Density and void ratio
9 Moisture content, water absorption and relative moisture content
10 Linear drying shrinkage value
11 Softening coefficient
12 Carbonation coefficient
13 Frost resistance
14 Permeability coefficient of wall blocks
15 Permeability of concrete blocks
16 Impermeability of concrete blocks
17 Test report
Annex A (normative) Compressive strength test method for right rectangular hexahedral concrete blocks
Annex B (normative) Compressive strength test method for concrete in blocks (core drilling method)
Annex C (normative) Compressive strength test method for concrete in blocks (cutting method)
Test methods for concrete blocks and bricks
1 Scope
This document describes the test methods for appearance quality, dimensions and dimensional deviations, flexural strength, compressive strength, density, void ratio, moisture content, water absorption, relative moisture content, linear drying shrinkage value, softening coefficient, carbonation coefficient, frost resistance, permeability coefficient of wall blocks, permeability of concrete blocks, impermeability of concrete blocks, and the test report for concrete blocks and bricks.
This document is applicable to concrete blocks, bricks and related unreinforced concrete block materials used in industrial and civil buildings, as well as in hydraulic, municipal, transportation, horticultural and landscape structures.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 18968, Terms of wall materials
JG/T 247, Concrete carbonation test chamber
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 18968, as well as the following, apply.
3.1
permeability of concrete blocks
The ability of water to penetrate through a concrete block under the action of gravity.
3.2
impermeability of concrete blocks
The resistance of a concrete block to water penetration under pressure.
4 Appearance quality
4.1 Apparatus
4.1.1 Metal ruler: scale division not greater than 1 mm.
4.1.2 Reading microscope: scale division not greater than 0.01 mm.
4.1.3 Transparent coordinate paper: grid side length of 2 mm × 2 mm.
4.2 Test methods
4.2.1 Surface skin adhesion and defects
4.2.1.1 Cover the surface to be measured of the specimen with transparent coordinate paper (see Figure 1), and trace the outline of the surface skin adhesion or defect.
4.2.1.2 Count the number of complete grids. For incomplete grids, examine each one individually; if the area occupied by the outline is greater than or equal to half of the grid, count it as one grid; otherwise, do not count. Record the total number of such grids.
4.2.2 Chipped edges and corners
4.2.2.1 Use a metal ruler placed against the edge of the specimen to measure the maximum projection dimensions of the chipped edge or corner in the three directions of length, width and height (see Figure 2). Read to the nearest 1 mm.
4.2.2.2 Count and record the number of chipped edges and corners.
4.2.3 Cracks
4.2.3.1 Use a reading microscope to measure the maximum width of each crack. Read to the nearest 0.01 mm.
4.2.3.2 Use a metal ruler to measure the maximum projection dimension L3L3 or h3h3 of the crack on the surface where it is located (see Figure 3). Read to the nearest 1 mm. When a crack extends from one surface to another, the cumulative projection dimension b3+h4b3+h4 shall be measured (see Figure 3). Read to the nearest 1 mm.
4.2.4 Expression of test results
4.2.4.1 The measurement result of surface skin adhesion and defects is expressed as the area of all counted grids, in square millimetres (mm²).
4.2.4.2 The measurement result of chipped edges and corners is expressed as the maximum projection dimensions in the three directions of length, width and height for each individual chipped edge or corner, rounded to the nearest 1 mm; the number of chipped edges and corners shall also be reported.
4.2.4.3 The measurement result of crack width is expressed as the maximum measured value, rounded to the nearest 0.01 mm.
4.2.4.4 The measurement result of crack length is expressed as the maximum projection dimension or cumulative projection dimension, rounded to the nearest 1 mm.
5 Dimensions and dimensional deviations
5.1 Apparatus
5.1.1 Metal ruler or steel tape measure: scale division not greater than 0.5 mm.
5.1.2 Brick caliper: scale division not greater than 0.5 mm.
5.1.3 Vernier calliper: scale division not greater than 0.02 mm.
5.1.4 Feeler gauge: minimum blade thickness 0.01 mm.
5.1.5 Straightedge: scale division not greater than 1 mm.
5.2 Test methods
5.2.1 Length, width and height
5.2.1.1 For blocks with a complete right rectangular hexahedral shape, use a metal ruler or steel tape measure to measure once at the middle position of the corresponding side surfaces of the block (see Figure 4). Read to the nearest 0.5 mm.
5.2.1.2 For auxiliary wall blocks, measure at the positions indicated on the product design drawing. Read to the nearest 1 mm.
5.2.1.3 For non-wall irregular blocks, measure dimensions at the positions indicated on the product design drawing according to the block shape characteristics (see Figure 5). Read to the nearest 1 mm.
5.2.2 Minimum wall and rib thickness
Use a vernier calliper to measure the wall and rib thicknesses of the perforated block, and identify the minimum wall and rib [see Figure 4a)]. Select 3 measurement points at the thinnest positions of the wall and rib (avoiding grooves, indentations and other structures) for measurement. Read to the nearest 0.02 mm.
5.2.3 Diagonal difference
Use a metal ruler or steel tape measure to measure the lengths of the two diagonals on the rectangular test surface of the block [see Figure 4b)]. Read to the nearest 1 mm.
5.2.4 Flatness
Use a straightedge and feeler gauge to measure along the two centre lines and the two diagonals of the test surface of the block. Read to the nearest 0.1 mm, and record the maximum gap value.
5.2.5 Bow
5.2.5.1 Bow of wall blocks
Place the straightedge against the test surface of the wall block, and use a metal ruler to measure the maximum distance between the straightedge and the block [see Figure 6a)]. Read to the nearest 1 mm.
5.2.5.2 Bow of non-wall blocks
Place the two legs of the brick caliper at the two ends of the edge on the complete test surface of the block, and slide the vertical scale to measure the maximum value [see Figure 6b)]. Read to the nearest 0.5 mm.
5.3 Expression of test results
5.3.1 Length, width and height are expressed as the arithmetic mean of two measurements, rounded to the nearest 1 mm.
5.3.2 Dimensional deviations of length, width and height are expressed as the difference between the measured value and the design value, rounded to the nearest 1 mm.
5.3.3 Minimum wall and rib thickness is expressed as the minimum of three measurements, rounded to the nearest 0.1 mm.
5.3.4 Diagonal difference is expressed as the absolute value of the difference between the two diagonal measurements, rounded to the nearest 1 mm.
5.3.5 Flatness is expressed as the maximum measured gap value, rounded to the nearest 0.1 mm.
5.3.6 Bow is expressed as the maximum measured value, rounded to the nearest 1 mm.
6 Flexural strength
6.1 Apparatus
Standard
GB/T 4111-2026 Test methods for the concrete block and brick (English)
GB/T 4111-2026 Test methods for the concrete block and brick English, Anglais, Englisch, Inglés, えいご
This is a draft translation for reference among interesting stakeholders. The finalized translation (passing through draft translation, self-check, revision and verification) will be delivered upon being ordered.
ICS
CCS
National Standard of the People's Republic of China
GB/T 4111-2026
Test methods for the concrete block and brick
混凝土砌块和砖试验方法
Issue date: 2026-02-27 Implementation date: 2026-09-01
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
the Standardization Administration of the People's Republic of China
Contents
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Appearance quality
5 Dimensions and dimensional deviations
6 Flexural strength
7 Compressive strength
8 Density and void ratio
9 Moisture content, water absorption and relative moisture content
10 Linear drying shrinkage value
11 Softening coefficient
12 Carbonation coefficient
13 Frost resistance
14 Permeability coefficient of wall blocks
15 Permeability of concrete blocks
16 Impermeability of concrete blocks
17 Test report
Annex A (normative) Compressive strength test method for right rectangular hexahedral concrete blocks
Annex B (normative) Compressive strength test method for concrete in blocks (core drilling method)
Annex C (normative) Compressive strength test method for concrete in blocks (cutting method)
Test methods for concrete blocks and bricks
1 Scope
This document describes the test methods for appearance quality, dimensions and dimensional deviations, flexural strength, compressive strength, density, void ratio, moisture content, water absorption, relative moisture content, linear drying shrinkage value, softening coefficient, carbonation coefficient, frost resistance, permeability coefficient of wall blocks, permeability of concrete blocks, impermeability of concrete blocks, and the test report for concrete blocks and bricks.
This document is applicable to concrete blocks, bricks and related unreinforced concrete block materials used in industrial and civil buildings, as well as in hydraulic, municipal, transportation, horticultural and landscape structures.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 18968, Terms of wall materials
JG/T 247, Concrete carbonation test chamber
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 18968, as well as the following, apply.
3.1
permeability of concrete blocks
The ability of water to penetrate through a concrete block under the action of gravity.
3.2
impermeability of concrete blocks
The resistance of a concrete block to water penetration under pressure.
4 Appearance quality
4.1 Apparatus
4.1.1 Metal ruler: scale division not greater than 1 mm.
4.1.2 Reading microscope: scale division not greater than 0.01 mm.
4.1.3 Transparent coordinate paper: grid side length of 2 mm × 2 mm.
4.2 Test methods
4.2.1 Surface skin adhesion and defects
4.2.1.1 Cover the surface to be measured of the specimen with transparent coordinate paper (see Figure 1), and trace the outline of the surface skin adhesion or defect.
4.2.1.2 Count the number of complete grids. For incomplete grids, examine each one individually; if the area occupied by the outline is greater than or equal to half of the grid, count it as one grid; otherwise, do not count. Record the total number of such grids.
4.2.2 Chipped edges and corners
4.2.2.1 Use a metal ruler placed against the edge of the specimen to measure the maximum projection dimensions of the chipped edge or corner in the three directions of length, width and height (see Figure 2). Read to the nearest 1 mm.
4.2.2.2 Count and record the number of chipped edges and corners.
4.2.3 Cracks
4.2.3.1 Use a reading microscope to measure the maximum width of each crack. Read to the nearest 0.01 mm.
4.2.3.2 Use a metal ruler to measure the maximum projection dimension L3L3 or h3h3 of the crack on the surface where it is located (see Figure 3). Read to the nearest 1 mm. When a crack extends from one surface to another, the cumulative projection dimension b3+h4b3+h4 shall be measured (see Figure 3). Read to the nearest 1 mm.
4.2.4 Expression of test results
4.2.4.1 The measurement result of surface skin adhesion and defects is expressed as the area of all counted grids, in square millimetres (mm²).
4.2.4.2 The measurement result of chipped edges and corners is expressed as the maximum projection dimensions in the three directions of length, width and height for each individual chipped edge or corner, rounded to the nearest 1 mm; the number of chipped edges and corners shall also be reported.
4.2.4.3 The measurement result of crack width is expressed as the maximum measured value, rounded to the nearest 0.01 mm.
4.2.4.4 The measurement result of crack length is expressed as the maximum projection dimension or cumulative projection dimension, rounded to the nearest 1 mm.
5 Dimensions and dimensional deviations
5.1 Apparatus
5.1.1 Metal ruler or steel tape measure: scale division not greater than 0.5 mm.
5.1.2 Brick caliper: scale division not greater than 0.5 mm.
5.1.3 Vernier calliper: scale division not greater than 0.02 mm.
5.1.4 Feeler gauge: minimum blade thickness 0.01 mm.
5.1.5 Straightedge: scale division not greater than 1 mm.
5.2 Test methods
5.2.1 Length, width and height
5.2.1.1 For blocks with a complete right rectangular hexahedral shape, use a metal ruler or steel tape measure to measure once at the middle position of the corresponding side surfaces of the block (see Figure 4). Read to the nearest 0.5 mm.
5.2.1.2 For auxiliary wall blocks, measure at the positions indicated on the product design drawing. Read to the nearest 1 mm.
5.2.1.3 For non-wall irregular blocks, measure dimensions at the positions indicated on the product design drawing according to the block shape characteristics (see Figure 5). Read to the nearest 1 mm.
5.2.2 Minimum wall and rib thickness
Use a vernier calliper to measure the wall and rib thicknesses of the perforated block, and identify the minimum wall and rib [see Figure 4a)]. Select 3 measurement points at the thinnest positions of the wall and rib (avoiding grooves, indentations and other structures) for measurement. Read to the nearest 0.02 mm.
5.2.3 Diagonal difference
Use a metal ruler or steel tape measure to measure the lengths of the two diagonals on the rectangular test surface of the block [see Figure 4b)]. Read to the nearest 1 mm.
5.2.4 Flatness
Use a straightedge and feeler gauge to measure along the two centre lines and the two diagonals of the test surface of the block. Read to the nearest 0.1 mm, and record the maximum gap value.
5.2.5 Bow
5.2.5.1 Bow of wall blocks
Place the straightedge against the test surface of the wall block, and use a metal ruler to measure the maximum distance between the straightedge and the block [see Figure 6a)]. Read to the nearest 1 mm.
5.2.5.2 Bow of non-wall blocks
Place the two legs of the brick caliper at the two ends of the edge on the complete test surface of the block, and slide the vertical scale to measure the maximum value [see Figure 6b)]. Read to the nearest 0.5 mm.
5.3 Expression of test results
5.3.1 Length, width and height are expressed as the arithmetic mean of two measurements, rounded to the nearest 1 mm.
5.3.2 Dimensional deviations of length, width and height are expressed as the difference between the measured value and the design value, rounded to the nearest 1 mm.
5.3.3 Minimum wall and rib thickness is expressed as the minimum of three measurements, rounded to the nearest 0.1 mm.
5.3.4 Diagonal difference is expressed as the absolute value of the difference between the two diagonal measurements, rounded to the nearest 1 mm.
5.3.5 Flatness is expressed as the maximum measured gap value, rounded to the nearest 0.1 mm.
5.3.6 Bow is expressed as the maximum measured value, rounded to the nearest 1 mm.
6 Flexural strength
6.1 Apparatus
