AG Mechanics CDE Practice Exam

What is the primary difference between mortar and concrete?

1. Mortar is more water-resistant

2. Mortar includes gravel while concrete does not

3. Concrete contains gravel whereas mortar does not

4. Concrete cures faster than mortar

The correct answer is: Concrete contains gravel whereas mortar does not

The primary difference between mortar and concrete is that concrete contains gravel, whereas mortar does not. Mortar is a mixture of water, cement, and fine aggregate such as sand, used to bind building blocks together, while concrete is a composite material composed of coarse aggregate (such as gravel), fine aggregate, cement, and water for construction projects like slabs and walls. The presence of gravel in concrete provides strength and durability, making it suitable for load-bearing structures.