ACI Concrete Field Testing Technician - Grade I Practice Exam

For what purpose are concrete slump tests conducted?

1. To determine the exact weight of the concrete mix

2. To measure the workability or consistency of the concrete

3. To assess the temperature of the concrete used

4. To evaluate the chemical composition of the concrete

The correct answer is: To measure the workability or consistency of the concrete

Concrete slump tests are conducted primarily to measure the workability or consistency of the concrete mix. This test provides valuable information about how easily the concrete can be mixed, placed, and finished. A higher slump value indicates a more fluid mix that can be more easily worked, while a lower slump value suggests a stiffer mix. Understanding the workability of concrete is crucial because it affects various aspects of construction. For instance, a mix that is too stiff may be difficult to place into forms, leading to inadequate consolidation and potential weak points in the final structure. Conversely, a mix that is too fluid might lead to segregation of materials, which can negatively impact strength and durability. The other options do not pertain to the purpose of the slump test. While the weight of the concrete mix or its chemical composition are important factors in determining overall concrete quality, they are assessed through different tests. The temperature of the concrete is also crucial but is measured via separate methods, as it influences the curing process and ultimately the concrete's performance.