This experiment is carried out to find and check the gradation of coarse aggregate i.e. crush. The concrete’s main bulky material is crush, it is used to increase the volume of the concrete along with its strength giving property. The gradation of other two materials of crush is checked by the experiment no 1 and experiment no 2, but here the purpose of finding the fineness modulus is not the same as in previous experiments. Instead here its fineness modulus is calculated for finding the water ratio to be used, along with the value of specific gravity of crush and its maximum grain size.
In this experiment the maximum size of coarse aggregate will be calculated from the table of fineness of modulus. For example if its maximum size is ¾ inches, then it means that it contain all the grain size less than and equal to ¾ inches. This can also be expressed by writing it as a: ¾ inch Down crush.
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