Bulking of SandThe main purpose of adding sand in concrete is to minimise the segregation of concrete bulkinng to fill out the bulking sand between the cement and coarse aggregate. This test bulking of sand or bulking of fine aggregate is to bulking sand that we are using the right amount of sand while concreting. Bulking sand of sand is nothing but the looseness of soil without compacting. Basically, water reduces the how do steroids work for copd in the sand and compacts the soil. The difference between the volume of loose soil to saturated soil is known as bulking of sand.
Bulking of Sand Test - Experiment Procedure and Importance - Civilology
What is the meaning of bulking of sand? When water is added to sand, a thin film of water is formed around the sand particles. The film exerts surface tension on particles, making them move apart. This leads to increase in volume because there is no direct contact among particles. How is bulking related to moisture content?
If sand absorbs further moisture, no bulking takes place. As fine grained sands have higher voids than medium and coarse grained sands, the percentage of moisture absorbed and the percentage volume increase is the highest.
What happens if bulking is not accounted for while preparing concrete? If care is not taken while volume batching, concrete is likely to be undersanded and gets hard eventually. The studies on bulking have showed this result. It is visible in the graphical representation of bulking also. How is particle size of sand related to bulking? Finer particle size will have more voids compared to coarser once.
They tend to absorb more water and hence exhibit more bulking. Bulking is the phenomenon applicable to both fine and coarse aggregates. Bulking is possible only in fine aggregates. In coarse aggregate, size of particle is large, void space is less and so water absorption is not possible up to the extent of fine aggregates.
Sand does not show any bulking when: A completely saturated sand has no void space left to absorb any more water and undergo bulking. What effect does bulking have on fresh concrete? The excess water in the sand can be used to maintain water-cement ratio. It improves workability and hence it is easier to place fresh concrete. Strength is a property of hardened concrete.