Gravel : Raw Materials of concrete hollow brick
The cement slurry shrinks fast, and the stone gravel acts to inhibit shrinkage and stabilize the volume. Play the role of the skeleton. The sand fills the voids of the stones, and the cement fills the voids of the sand to form a dense pile. The concrete mixture acts as a cohesive and water-retaining agent. Good sand and gravel grading to prevent segregation and severe bleeding. Reduce the cost of concrete in brick production .
