Question

What is the effect of algae in mixing water used for concrete?

1) Reduced strength
2) Reduced slump
3) Discoloration of the finished concrete
4) Premature contraction cracking

Answer 1

Algae in mixing water used for concrete can have several negative effects, including reduced strength, reduced slump, discoloration of the finished concrete, and premature contraction cracking.

Step-by-step explanation:

Effect of Algae in Mixing Water Used for Concrete:

Algae can have several negative effects on mixing water used for concrete:

Reduced strength: Algae can contribute to reduced strength in concrete by interfering with the hydration process. Algae produce organic acids and enzymes that can degrade cement paste, leading to weaker concrete.

Reduced slump: Algae can bind with the cement particles and water, causing the concrete to become less fluid and harder to work with, resulting in reduced slump.

Discoloration of the finished concrete: Algae can produce pigments that can stain or discolor the surface of the finished concrete, affecting its aesthetic appearance.

Premature contraction cracking: If algae are present in the mixing water, they may interfere with the curing process and lead to uneven shrinkage, which can result in premature contraction cracking.