General Contractor Practice Exam

What is the first rolling process of concrete known as?

1. Final rolling

2. Breakdown rolling

3. Intermediate rolling

4. Finishing rolling

The correct answer is: Breakdown rolling

The first rolling process of concrete is known as breakdown rolling, which primarily occurs just after the concrete has been poured and is still in a plastic state. This method is crucial in the initial stages of concrete placement because it helps in consolidating the mix, ensuring that there are fewer voids and that the aggregate is properly distributed throughout the mixture. This consolidation is necessary for achieving the desired strength and durability of the concrete. Breakdown rolling aids in compressing the surface and reduces the amount of air trapped within the concrete, which can otherwise compromise its integrity. It sets the stage for further finishing processes, making it an essential step in the overall construction process. The subsequent rolling processes, like intermediate and finishing rolling, build upon the results of the breakdown rolling to achieve a smooth and workable surface.