Concrete is a manufactured product. Specific control tests and evaluations are required during the manufacturing process to produce predictable high-quality concrete. The customer may want to verify that concrete meets specifications. Some of the important properties of concrete that are measured by basic quality control tests are strength, temperature, slump, air content, and unit weight. In general concrete is tested at a frequency of 1 in 150 cubic yards
 

Each test helps to determine the quality of concrete and it should be performed in accordance with standards. A certified Concrete Field Testing Technician – Grade I, must make the tests.
 

1. Define the basis of purchase, cubic yards, and how it is measured.
    

2. Define acceptable material specifications and acceptable industry practice and tolerances.
    

3. Define strength testing procedures and acceptance criteria.
    

4. Set laboratory personnel qualifications. The testing laboratory must comply with ASTM C 1077, which is required in ASTM C 94.