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To control concrete placement temperature, the mixing water can be chilled. The unit notes that one kilogram of water absorbs approximately how much heat for a 1 °C rise in temperature?
Answer & Solution
Correct answer: B.
1. Specific heat capacity of water sets how much energy a kilogram absorbs per degree.
2. The unit reports the value as 4.18 kJ per kilogram per °C.
3. Kg-for-kg, a temperature change in mixing water has about five times the effect on concrete temperature as the same change in cement or aggregate.
4. So cooling water is the simplest first step in mass-concrete temperature control.
5. The other values do not match the specific heat of water.
_Source: IGNOU Concrete Technology, Unit 7 "Concreting Equipment" (Mixers, Cableways, Batchers, Buckets, Pre/Post Cooling)._
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