Algae are observed on the surface of the mixing water or on the surface of the aggregates. The algae (algae in aggregates) will combine with cement (cement + algae) reducing the bond between the cement paste and aggregates. The algae entering the mix through water will result in the air entrainment in large quantities, which in turn result in the reduction of concrete strength. so construction water before get used for construction must be done construction water testing.
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