How many trial molds do you usually need on the construction site? What is the size?

Under normal circumstances, there are not less than 9 groups of concrete test on the construction site 150* 150 or 100* 100, and at least 6 groups are required for standard maintenance under the same conditions and 600 days, and 3 groups are reserved. If there are requirements for impervious concrete, at least 6 groups are needed. At least 6 sets of mortar test molds are used for the same conditions and standard maintenance.

According to different physical performance requirements, concrete tests have different specifications and sizes. The most commonly used test is the compressive strength test of concrete cube. This test is based on length× width× height =150x150x150x (mm). If the particle size of coarse aggregate in concrete is less than 3 1.5mm, it can also be used. The above three specimens are 1 group.

In order to measure the axial compressive strength of the concrete prism, the length× width× height = 150× 150×300(mm) can be used to test the mould. Three specimens were used as 1 group.

In order to measure the splitting tensile strength of concrete and compare the tensile properties of concrete, the standard test of150×150×150 (mm) can be adopted when the maximum particle size of coarse aggregate is less than 40mm, and the length× width× height = 6544 can be adopted when the maximum particle size of coarse aggregate is less than 20mm. Three specimens were used as 1 group.

Extended data:

GB T 5008 1-2002 Standard for Test Methods of Mechanical Properties of Ordinary Concrete stipulates: 150× 150×600mm (or 550) prism test, or100×100×. The flexural strength of cement concrete is150 mm×150 mm× 550 mm beam specimen's flexural-tensile failure after reaching the specified age under standard curing conditions (28 days), with a net span of 450mm and double fulcrum load.

Baidu encyclopedia-model test

China hownet-the product standard of concrete mould trial will be implemented soon.