Highway Materials MCQ with answer and solution

Concept

Special forms of bitumen

Step-by-step solution

1. Cut-back and emulsion are used mainly for surface dressing and road work. 2. Blown (oxidised) bitumen is hard and used for waterproofing and roofing. 3. Plastic bitumen is a soft, workable form used to fill cracks and joints.

Explanation

Plastic bitumen is made workable by adding fillers to bitumen. It adheres to surfaces and remains flexible, so it is used for filling cracks in masonry.

Shortcut

Cracks and joints → plastic bitumen.

Common mistake

Choosing emulsion because it can be used cold.