Note – Fine sand bulks more compared to coarse sand. It is essential to check the moisture content every time before using it so that we could add a respective percentage buffer to make the right concrete mix ratio. Due to the surface moisture, there is a chance for honeycomb formation in concrete.The concrete seems to be stony, and it may be prone to segregation.It will be changing the volumetric mix proportion of concrete.The coarse aggregate will be affected by the moisture content.The 5% to 8% of surface moisture will increase the bulking of sand up to 20% to 30%. When we add more water to the sand, the thin film will disappear, and the volume decreases. The reason for that is the moisture content present in the sand makes it a little bulkier.
If the moisture is present in the sand, then it makes the sand look bulkier, which could result in inadequate sand proportion in the concrete ratio.įor Example, If we need to add 1m 3 sand in the concrete mix ratio, we take 1.3 m 3. In the design mix, we weigh the materials. Up to the M25 grade of concrete, we make nominal mixes by volumetric measurement. Why is it important to find bulking of sand? This change makes the overall volume of the sand to increase. When the moisture content is present in the sand, it forms a thin film around each sand particle that makes the adjusted particles push little away from them.
The volume change that sand attains when moisture content present in it is known as the bulking of sand. Video Illustration What is the bulking of sand?īulking of sand is caused due to moisture content.
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