Which component of concrete gives it the desired compressive strength?

🏛️ Which Component Gives Concrete Its Compressive Strength?

This question is disputed in the SSC JE source. The official revised answer key marks Cement (B) as correct, because it is the cement paste that binds the aggregate skeleton together and develops strength through hydration.

Note: A strong argument can also be made for aggregates (C), which physically resist compressive loads and constitute 70–80% of the concrete volume. However, aggregates alone without cement paste cannot resist applied loads as a unit — the binding function of cement paste is what gives concrete its integrity. Go with the official key: Cement.

Key takeaway

In exam context: cement paste is the active component that develops strength. Aggregates are passive fillers, however strong they may be individually.