How to wash sand for produce concrete

2021-05-11

What specifications of washed sand meet the standards for producing concrete? It is necessary to ensure that the sand washing machine has a good washing effect.
The combination of fine sand and coarse sand is appropriate, and the rock with higher hardness should be selected as the raw material for sand making.

Can washed sand be used in concrete?

As construction sand, washed sand needs to meet certain standards. The particle gradation of sand means the collocation of sand-sized particles. The voids between the sand grains in the concrete are filled by cement slurry. In order to save the cement and improve the strength, the voids between the sand grains should be minimized.

If it is the same thickness of sand, the gap is the largest. The combination of two particle sizes of sand will reduce the voids; the combination of three particle sizes of sand will reduce the voids. It can be seen that in order to reduce the voids between sand particles, there must be a combination of particles of different sizes. The degree of sand thickness refers to the overall thickness of sand particles of different particle sizes mixed together, usually divided into coarse sand, medium sand and fine sand.

Under the same quality conditions, the total surface area of ​​fine sand is larger, while the total surface area of ​​coarse sand is smaller. In concrete, the surface of the sand needs to be covered with cement slurry. The larger the total surface area of ​​the sand, the more cement slurry needs to cover the surface of the sand. Therefore, generally mixing concrete with coarse sand requires less cement slurry than fine sand.

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