Pouring concrete should be avoided during extreme weather conditions, particularly when temperatures drop below freezing or soar into excessive heat waves, or during heavy downpours. Freezing temperatures cause the mixing water inside fresh concrete to freeze and expand into ice crystals, destroying the chemical hydration process and permanently ruining the structural integrity of the slab. Conversely, pouring in extreme heat causes the water to evaporate far too rapidly, leading to severe shrinkage cracks and weak surfaces. Heavy rain can also wash away the crucial cement cream from the surface before it sets, leaving behind a loose, sandy aggregate layer that lacks durability and load-bearing strength.
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