Prediction of Net Expansion of Expansive Concrete under Restraint

Abstract

This research studied net expansion of expansive concrete with different dosages of expansive additive, fly ash as well as varied restraining steel ratios. In addition, effect of multi-directional restraint on the net expansion was studied. It was found that the net expansion of expansive concrete increased remarkably when the amount of hyper expansive additive (HEA) was in the range of 10 kg/m³ to 15 kg/m³ at all restraining ratios. Fly ash slightly increased net expansion. Moreover, net expansion was not influenced by types of restraint i.e. internal, external, and combined internal and external as well as multi directional restraint. An equation for net expansion prediction under restraint was finally proposed.