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GATE 2020 CE (CE2) – Question 18

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

As per IS 456:2000, pH of concrete mixing water shall NOT be less than ______.

  1. 4.5
  2. 5.0
  3. 5.5
  4. 6.0

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Correct answer: (D) 6.0

Explanation

The cited concrete-water requirement is **pH6.0,D**,as the lower limit. Excessively acidic mixing water can adversely affect cement hydration and concrete durability. This question tests the specific standard value,not the definition of neutralpH.