Retaining 0.075mm particles in sand washing

For concrete cohesion, they believe that if there are fewer particles <0.075mm in the sand, the concrete will easily bleed, and the mixed concrete will be relatively dry and astringent. Therefore, the appropriate content of <0.075mm particles has certain benefits for the cohesion and water retention of concrete. When the mud content is 5% of the sand mass, the workability is good, but when it reaches 10%, the bleeding of concrete is more obvious. The mud content not only has some effect on the initial slump of concrete, but also has a great harm to the slump loss of concrete over time.

In the absence of admixtures, it is generally believed that when the mud content in the sand is <3%, the workability of the concrete is less affected, but as the mud content increases, the slump of the concrete continues to decrease. When it is greater than 3%, the workability of the concrete will be greatly affected.

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