Will the high mud content in sand reduce the strength of concrete?
April.16,2025
If the sand contains a lot of mud, the concrete will need a lot of water, have poor plasticity, shrinkage, decrease concrete strength, and the structure will be prone to cracking. Therefore, the mud content of sand should be controlled to be ≤3%, and the mud content of high-strength concrete is required to be higher.
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What effect will mud blocks in sand and gravel have on concrete?
According to the results of the compressive strength test, as the mud content in the sand continues to increase, the corresponding 7d and 28d compressive strengths of concrete have both decreased significantly. This is because the mud content in the sand reduces the activity of the cementitious material cement in the constituent materials, resulting in the inability of the cement paste to directly wrap the aggregate, weakening its bonding ability with the aggregate, resulting in weak areas inside the mixed concrete, and reducing the strength of the concrete. At the same time, dispersed mud blocks will directly affect cement hydration, thereby reducing the strength of the concrete.
Mud blocks will weaken the concrete section, float when pouring the ground, and form defects such as pits on the surface after shrinkage.
