The concrete mixer can ensure the quality of concrete by carefully selecting the raw materials

 Concrete is made up of cement, sand, stone, admixtures, admixtures and water. The properties and quality of these materials and their quality stability directly affect the quality and performance of concrete mixers. Careful selection of raw materials is the basis for ensuring the quality of concrete.

1, stone

Coarse aggregate is a gem with a diameter greater than 5 mm. In the mixing station, the particle size of pebbles is no more than 80mm, and the particle size of gravel is no more than 60mm.

2, the sand

Fine aggregate refers to sand, gravel particle size is not more than 5mm, mainly refers to sand, usually divided into coarse sand, medium sand, fine sand and ultra-fine sand. It is represented by a fineness module ranging from 0.7 to 3.7, depending on its dimensional specifications. Sand and gravel aggregates usually require a good gradation of grain size, i.e. the heads are large and small and can fill Spaces with each other. In this way, the concrete mixer formed by the commodity concrete compact structure, the process of transportation is not easy to separate.

3. The cement

Cement is a material that sets easily, mainly used as cement in commercial concrete. Ordinary cement is commonly used in civil engineering. The cement scale in commodity concrete chooses according to the characteristic of all sorts of cement, its dosage basically decides according to intensity index, the intensity of cement reflects in the intensity grade of cement (call cement before) in. Tags).

The strength grade of cement is determined by the strength obtained by compression test of 28d mortar blocks. For example, cement with a strength grade of 425 has a strength of about 42.5MPa.

Cement storage should be rechecked for more than 3 months from the date of shipment. The strength of cement in commercial concrete should be slightly higher than or equal to the strength of commercial concrete. When the strength of ready-made concrete is very low, the mixture can be mixed to save cement. The amount of cement in each type of concrete should not exceed 550 kg.