Answer / jitendergb

Coarse aggregate is always broken in unequal shapes it
helps in making interlocking in between all concrete mix,
but there remain empty space in between coarse aggregate
with out fine aggregate or sand like badarpur or crusher
sand, so just to fill the space and preventing concrete
from honeycombing and air pocketing in concrete mix we
always use badarpur sand or crusher sand in concrete mix.
Cement can not fullfill this empty space.

Design a reinforced concrete combined footing (rectangular) for two columns located 3.60 metres apart. The overall sizes of the columns are 40cm x 40cm and 69cm x 60cm and the loads on them are 1000 kn and 1500 kn respectively. The space available for the width of the footing is restricted to 180cm. The S.B.C. of the soil is 280 kn/mm2 use M15 concrete.

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