SITUATION: The basic data for proportioning trial batches for normal weight concrete with an

average compressive strength of $35$ MPa at $28$ days are as follows:

Slump $=75mm$ to $100$ mm

Water $-$ cement ratio by weight $=0\mathrm{.}48$

Specific gravity of cement $=3\mathrm{.}15$

Specific gravity of coarse aggregate $=2\mathrm{.}68$

Specific gravity of fine aggregate $=2\mathrm{.}64$

Water net mixing