Tips to measure the quantities of cement, sand and aggregate for Nominal Concrete Mix (1:2:4)
Mix design refers to the method for finding out the proper quality materials and their relevant ratios which can be used to form concrete with optimal properties ranging from applicability, strength, setting time and stability.
To form nominal mix concrete, cement, sand and aggregate are roughly proportioned. The purpose of nominal mix concrete is to gain target compressive strength.
Mix ratio of concrete specifies the ratio of cement sand and aggregate by volume in that order. Therefore, a mix ratio of 1:2:4 signifies Cement: Sand: Aggregate – 1:2:4 (by Volume).
Material essential for forming 1 Cum of Nominal Concrete Mix.
The following materials are necessary to develop 1 Cum of Concrete on the basis of a specified Nominal Mix Proportion.
With continuous research and development in cement technology sector and its manufacturing process, a M20 mix of “1:1.5:3″(by volume) would be too heavy, over engineered and invaluable (~7.5 bags of cement per cum) and will finally lead to a M30 concrete and above (IS:456 too contains the minimum cement/cementitious content of 06 bags for M20).
Lately developed 53 grade OPC cement is finally providing a strength of 65 to 70 MPa at 28days, 1:2:4 will provide a strength of M20.
A detail method for measuring the cement bags essential for 1:2:4 mix (~6 bags of cement per cum) is given below.
Method-1: DLBD method to define material requirement for Nominal Concrete Mix (M20 – 1:2:4)
The DLBD (Dry Loose Bulk Densities) method stands for a perfect method to compute cement, sand and aggregate for a specified nominal mix concrete.
It provides precise results because it considers the Dry Loose Bulk Densities of materials like Sand and Aggregate that differs according to the local source of the material.
The calculation is based on a nominal concrete mix proportion of 1:2:4 (~M20).
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