Considering 4 ksi concrete and usual mix proportioning
Amount of material roughly required for 1 yd3 would be (may change based on material properties and concrte specifications),
Cement = 550 lb
sand = 1300 lb
graval = 1800 lb
water = 290 lb
Now,
for 90.32 yards slab of 6 inch thickness,
Volume of concrete = 90.32 * 0.167 = 15.1 yd3
Adding 10% extra for wastage,
Volume of concrete required = 16.6 yd3
Therefore, amount of materials required,
Cement = 9135 lb
sand = 21600 lb
graval = 29900 lb
water = 4820 lb
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