Incorrect moisture correction for aggregates is one of the most common reason for low strengths and failure in concrete. Water cement ratio governs the strength of concrete and every mix design stipulates a certain water cement ratio to be used. Mix design is always given on the basis of Saturated Surface Dry or “SSD” condition of aggregates which rarely exists in actual practice. Presence of moisture in aggregates disturbs the water cement ratio. The aggregates are either moist, wet or in dry condition. Moist aggregates release water and increase the water cement ratio resulting in higher workability. Dry Aggregates absorb water and reduce the water cement ratio and lowers water cement ratio resulting in lower workability. Moisture Correction needs to be done daily and even multiple times in day especially in rainy season. Higher grade mixes are very sensitive to small changes in water cement ratio. One must compare the workability of concrete at site with the one stipulated in Mix design as change in workability can be an indicator for incorrect moisture correction.

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