EXPERIMENT NO-2

OBJECT: To determine the bulking of sand
APPARATUS.
250 ml measuring cylinder ,
weighing balance etc .
PROCEDURE
(i) Take 500gm (W1) of the aggregate.
(ii) Keep the sample in an oven in a tray at a temperature of 100°C-110° C for 24 ± 0.5 hours .
(iii) Cool the sand in an air tight container and weight it (W2)
Water content of the sample = (W1-W2) x 100/W1
(iv) Take out about 250gm of sand and pour it into a pan.
(v) Add 2% (by weight) of water and mix well.
(vi) Pour the sand sample into a 250 ml measuring cylinder and consolidate by shaking.
(vii) Level the surface and read the volume in ml (Yi).
(viii) Take out the whole quantity of sand and continue the experiment by adding 2% water more each time and note the corresponding volume of sand (Y2,Y3…..) until the dump sand volume starts decreasing.
(ix) Beyond this point, add 4% more water each time until the sample become fully saturated.
(x) To the standard sample in the measuring cylinder, add about 50 ml water ore and stir the sample well.
(xi) Note down the surface level of inundated sand (Y ml).



CALCULATIONS
Bulking =(Y1-Y)x100/Y
GRAPH
A graph drawn with % water content along X-mas and % bulking along Y- axis.
From the graph, pick out maximum % of bulking occurred, % of water content at maximum bulking , % of water content When bulking is zero & % of bulking for the initial water content (W) of the sample.
RESULTS
% of bulking occurred =
% of water content at maximum bulking=
% of water content when bulking is zero=
% of bulking for the initial water content (W) of the sample =