Core TradesQuestion 171 of 700
When placing concrete in cold weather, the MOST important protective measure is to:
a.Keep the concrete above freezing until it has gained adequate early strength
b.Add extra water to keep the mix workable in the cold
c.Remove all curing blankets as soon as finishing is complete
d.Increase the slump to speed up placement
Explanation
Fresh concrete must be kept above freezing until it develops enough early strength, because water freezing in the paste disrupts hydration and permanently weakens it. Adding water or increasing slump raises the water-to-cement ratio and lowers strength, and removing insulation early exposes the concrete to freezing.
Law Reference: 2025 CA Building Code, Chapter 19 (Concrete)Practice all 700 questions free — no signup required.
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