Problem
1. List four nondestructive test method for the evaluation of concrete quality. Which one can be used as a direct substitute for determining the compressive strength of concrete?
2. What are the principles behind the following test procedures: Schmidt hammer test, Windsor probe test, pullout test, pulse velocity test? Explain which you would recommend for deciding the formwork removal time.
The response should include a reference list. Double-space, using Times New Roman 12 pnt font, one-inch margins, and APA style of writing and citations.