NICET - Highway Construction Inspection Practice Exam

What is the accepted surface deviation for a Portland cement base course when using a ten-foot straight edge?

1. 1/2 inch

2. 3/4 inch

3. 1 inch

4. 1 1/2 inches

The correct answer is: 3/4 inch

The accepted surface deviation for a Portland cement base course, when measured with a ten-foot straight edge, is indeed 3/4 inch. This specification is in place to ensure a smooth and level surface of the base course, which is crucial for the overall structural integrity and longevity of the pavement that will be placed on top. A deviation greater than this can lead to issues such as uneven wear, reduced load distribution, and ultimately, premature pavement failure. Maintaining this standard helps in achieving better ride quality and improved safety on the roadway. It is therefore important for inspectors and construction personnel to understand this tolerance level, as adherence to these specifications aids in achieving a high-quality construction outcome.