Question

Which of the following are the basic ingredients for the concrete mixture?

• A. Pabbles and water
• B. Water, Sand and Cement
• C. Cement, wood and clay
• D. Clay and Cement

Hint:

A simple way to think of concrete is a paste of cement and water that coats and binds together aggregates (sand and gravel) to form a rock-like mass.

Answer 1

The Correct Option is B

Step 1: Define concrete. Concrete is a composite material composed of aggregate bonded together with a fluid cement that hardens over time.
Step 2: Identify the core components. The main components are:

Binder: Cement (typically Portland cement)
Water: To trigger the chemical reaction (hydration) of the cement.
Aggregates: These are inert granular materials. They are divided into fine aggregate (sand) and coarse aggregate (gravel or crushed stone, i.e., "pabbles").
Option (B) lists three of these essential ingredients. While it omits the coarse aggregate, it is the most complete and correct combination among the choices. The other options include incorrect materials like wood or clay or are incomplete.