Massachusetts Construction Supervisor License (CSL) Practice Test

Does a test cylinder that fails at a load of 70,000 lbs have enough strength for footings in a dwelling with moderate weathering potential?

1. Yes

2. No

3. Only with reinforcement

4. Depends on the application

The correct answer is: No

In the context of evaluating the strength of a test cylinder for use in footings within a dwelling, it is essential to consider the minimum compressive strength requirements for concrete, particularly under moderate weathering conditions. The standard for residential footings typically requires that concrete have a minimum compressive strength of 2,500 psi. To determine if a test cylinder that fails at a load of 70,000 lbs is adequate, one must take into account the dimensions of the cylinder being tested. The strength of the concrete (psi) will depend on how the load translates to pressure per square inch on the cross-sectional area of the cylinder. If the resulting compressive strength calculated from that load is below the required specifications for footings, then it is affirmed that the concrete is not suitable for the intended application, even under moderate conditions. In this case, as the test result shows a failure at a significant load but does not meet the necessary strength criteria for construction footings, it’s determined that the strength is insufficient. Thus, the appropriate choice reflects that the test cylinder does not possess enough strength for footings in a dwelling subject to moderate weathering potential.