2010 Volume 21 Issue 2 Pages 2_57-2_67
Effective method for the enhancement of performance of structural lightweight concrete was experimentally studied. Water cement ratio was reduced to 30%. Steel fiber was added as much as 1% by volume. The mix proportion of the high-performance lightweight concrete was designed by determining the optimum combination of unit water and dosage of superplasticizer so that self-compactability was assured. As results, the lightweight concrete having 65N/mm2 compressive strength and 28.5kN/mm2 elastic modulus was made. It was confirmed that the lightweight aggregate used can effectively reduce the autogenous shrinkage of concrete. It was verified that a reinforced concrete beam made of the high-performance lightweight concrete has enough performance in both flexural capacity and crack dispersion in comparison with RC beams with ordinary concrete.
