Common blue brick sizes are: 60×240× 10mm, 75×300× 120mm, 100×380mm, 100×400× 120mm.

Extended data:

Blue bricks are made of clay, which is the product of long-term weathering of some aluminosilicate minerals, and is named because of its strong viscosity. Clay is added with water to make bricks, and then calcined in a brick kiln (900℃- 1 100℃ for 8- 15 days) to make bricks.

Clay contains iron, and when it is completely oxidized during firing, iron oxide is red, which is the most commonly used red brick. However, if the iron in clay is not completely oxidized (Fe3O4) by cooling with water during firing, it will be blue, that is, blue bricks.

The hardness of blue bricks and red bricks is similar, but the cooling method after firing is different, while red bricks are naturally cooled, which is simpler, so more red bricks are produced, while blue bricks are cooled with water (in fact, it is a kind of anoxic cooling), which is more troublesome to operate, so less is produced.

Although the strength and hardness are similar, the performance of blue brick is obviously better than that of red brick in oxidation resistance, hydration and atmospheric erosion. The firing time of blue bricks generally depends on the size of the kiln; Small kilns (about 20,000-25,000 pieces of blue bricks) generally drink water for 20 days (excluding drinking water) for 5 days; The kiln takes about 30 days.

Blue bricks belong to sintered bricks; The main raw material of ancient blue brick is clay, which is mixed and extruded with water, burned in a brick kiln to about (1000℃), and cooled with water, so that the iron in the clay is not completely oxidized, and it has good weather resistance and water resistance.

After testing, the compressive strength of ancient blue brick is greater than 10 MPa, and the water absorption is less than 20%. Antique blue brick is a common antique building material, which is made of clay materials used in antique tiles according to the firing method of ancient blue bricks.

The product quality of brick must be qualified, and it should be tested before use, with factory certificate and test report. Before use, sampling inspection should be carried out according to the variety, specification, origin and batch. The requirement for bricks is compressive strength. If the test results are unqualified, double sampling should be taken for a second interview. If it is unqualified, the acceptance criticism is determined as unqualified.

In any of the following circumstances, if there is doubt about its material and it is used for load-bearing structures, a second interview should be conducted. Unqualified materials shall not be used, and the corresponding treatment report shall be made. Bricks that can only be used after taking certain technical treatment measures should meet the technical requirements and be approved by the technical director before use.

Documentary should collect, sort out and verify the factory certificate and test report of brick in time. The quality certificate and test report shall be legible, complete, accurate and true, and there shall be no missing or wrong filling, no outstanding matters, no alteration, forgery, damage or random withdrawal.

If the batch is large and less factory certificates are provided, you can make a copy (such as a copy) for future reference, and indicate the original certificate number, storage unit and copying time, with the signature of the photocopier and the seal of the photocopier.

References:

Baidu encyclopedia-blue brick