An increase of 1% of water cement ratio
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The water/cement ratio influences concrete permeability to a great extent. The higher the w/c ratio the greater the concrete permeability. Increase in w/c ratio from 0.4 to 0.7, increases the permeability by nearly 4 orders of magnitude i.e. from 10-12 cm/s to 10-8 cm/s.
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