Question

What is the purpose for vibrating concrete?

1) Separate the course aggregate
2) Move the concrete in the form
3) Make the concrete stiffer
4) Make the concrete psi stronger

Answer 1

The purpose of vibrating concrete is to eliminate air bubbles and voids, resulting in a denser and more homogenous material that ultimately has greater psi strength.

Step-by-step explanation:

The purpose of vibrating concrete is to improve its consolidation and, as a consequence, enhance its strength and durability. This process helps in eliminating air pockets and voids within the concrete mix, ensuring that the aggregate is uniformly distributed and that the concrete achieves full contact with the reinforcement and formwork. When concrete is properly vibrated, it becomes more homogenous and dense, which contributes to a higher concrete psi strength. Importantly, vibrating does not make the concrete stiffer; it actually does the opposite by temporarily increasing its workability and flowability to better fill the forms. Therefore, the correct option for the purpose of vibrating concrete is to make the concrete psi stronger.