The GATE Grind

GATE 2023 CE (CE1) – Question 15

Construction Materials · Concrete: constituents, mix design, short-term and long-term properties · 1 mark · Multiple choice

In cement concrete mix design, with the increase in water-cement ratio, which one of the following statements is TRUE?

  1. Compressive strength decreases but workability increases
  2. Compressive strength increases but workability decreases
  3. Both compressive strength and workability decrease
  4. Both compressive strength and workability increase

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Show answer and explanation

Correct answer: (A) Compressive strength decreases but workability increases

Explanation

A higher water-cement ratio makes the mix more fluid (better workability) but leaves more pores after the water evaporates, so the strength falls (Abrams' law).