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The desired low permeability in concrete is achieved by having adequate cement, sufficient low water/cement ratio, by ensuring full compaction of concrete and by adequate curing. 2.7.10 UNIT WEIGHT OF CONCRETE The unit weight of concrete depends on percentage of reinforcement, type of aggregate, amount of voids and varies from 23 to 26 kN/m2. The unit weight of plain and reinforced concrete as specified by IS:456 are 24 and 25 KN/m3 respectively. 2.8 EFFECTS OF CONCRETE MIX The presence of excessive water in a concrete mix although may facilitate the easy placement of concrete but it also lowers the quality of the overall product. The damage to concrete structures due to excessive water in a concrete mix is very common and the repercussions due to this are briefly explained. Following are the effects caused by the presence of excess water in a concrete mix : 1. Strength Reduction 2. Drying shrinkage 3. Loss of abrasive resistance 4. Increase in permeability 5. Dusting and scaling 6. Reduced durability 17PDF Image | concretes that use polymers as a binder
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