ACI Concrete Flatwork Finishing Certification Practice Test 2026 - Free Concrete Flatwork Finishing Practice Questions and Study Guide

Excessive bleeding in freshly placed concrete can be a significant issue, as it undermines the quality and strength of the concrete finish. One way to mitigate this risk is by not adding water to the mix after it has been initially batched.

Adding water can increase the water-to-cement ratio, which compromises the concrete's overall strength and durability. It also increases the likelihood of bleeding, as more water is present than originally intended. This leads to a situation where excess water rises to the surface as the concrete sets, creating a weak surface layer that can affect bonding for subsequent layers or finishes.

On the other hand, using fine aggregates, thoroughly mixing the concrete, and controlling ambient temperature are generally practices that help improve the overall quality and performance of the concrete. For instance, fine aggregates can help reduce the voids between particles, potentially leading to a denser mix, while controlling temperature can limit the rate of hydration and evaporation, which might otherwise exacerbate bleeding issues. However, these methods do not directly counteract the negative effects caused by adding water post-mixing.