BULKING OF FINE AGGREGATES/SAND FIELD METHODS TEST

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 BULKING OF FINE AGGREGATES/SAND FIELD  METHODS TEST

 

 

Two methods are suggested for determining the bulking of sand/fine aggregate. the procedure may be suitably varied, if necessary. Both depend on the fact that the volume of inundated sand/fine aggregate is the same if the sand /fine aggregate were dry.

 

METHOD 1

                 Put sufficient quantity of sand loosely into a container until it is about two-third full. Level the top of the sand and push a steel rule vertically down through the sand at the middle to bottom, measuring the height. Suppose it is X cm.

Empty the sand out of the container into another container where none of it is lost. Half fill the first container with water. Put back about half the sand and rod it with a steel rod, about 6 mm diameter, so that its volume is reduced to a minimum. Then add the reminder and level the top surface of the inundated sand. Measure its depth at the middle with the steel rule. Suppose this is Y cm. the percentage of bulking of the sand due to moisture shall be calculated from the formula:

Percentage bulking = ( X/Y-1 ) *100

 

METHOD 2

                    In a 250ml measuring cylinder, pour the damp sand, consolidate it by staking until it reached the 200 ml mark. Then fill the cylinder with the water and stir the sand well. The water she'll be sufficient to submerge the sand completely. it will be seen that the sand surface is now below its original level. Suppose the surface is at the mark of “ Y ” ml, the percentage of bulking of sand due to moisture shall be calculated from the formula.

 

Percentage bulking =( 200/Y-1 )*100  

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as per P.W.D

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