Question

120 Permeability As w/c = 0.3 to 0.7: coefficient of 140 permeability increases by a factor of 1000. For a concrete to be watertight, the water-cement ratio should not exceed 0.48 for exposure to fresh 60 water and should not be more than 0.44 for exposure to seawater. 100 80 Coefficient of permeability, 10-14 m/s 40 20 0 0.2 0.3 0.4 0.5 0.6 0.7 0.8 Water-cement ratio

Answer 1

for fresh water structure for being water tight water cement ratio W / C <0.48

cement=1000kg

W / 1000 < 0.48

so W <0.48x1000=480kg

water <480kg

1 kg of water is 1 liter

so 480kg that is 480 liter of water is the maximum allowable amound

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