222 StatementI Attention must be extended to the results of

2.22 Statement-I : Attention must be extended to the results of the phenomenon of bulking of sand towards ascertaining the water demand in mortar preparation. Statement-l1 The total volume of mortar prepared per batch of mix preparation for use- in-work should be mindful of the initial settling time. Both Statement (I) and Statement (II) are individually true and Statement (Il) is the (a) correct explanation of Statement (I) (b) Both Statement () and Statement (lI) are individually true but Statement (II) is NOT the correct explanation of Statement (1) (c) Statement (I) is true but Statement (Il) is false (d) Statement () is false but Statement (l) is true

Solution

Option b is correct.

The increase in the volume of a given mass of fine aggregate caused by the presence of water is known as bulking. If sand is measured by volume and no allowance is made for bulking, the mix will be reicher than that specified because for a given mass, moist sand occupies a considerably larger volume than the same mass of dry mass. This results in a mix deficient in sand.