Influence of superplasticizer on performance of sulfo-aluminate expansion agent at the equal water-binder ratio

The influences of naphthalene series,amino sulfonic and polycarboxylate superplasticizer on the performances of sulfo-aluminate expansive agents were investigated in the same waterbinder ratio systematically.The results showed that superplasticizer used together with sulfo-aluminate expansive agents can reduce restrained-expansion rate of expansive agent,and drop free-expansion rate mixing naphthalene series and amino sulfonic,increase expansion index,so resulting in the reduction of efficient expansion energy of expansive agent.Therefore,under the same amount used,superplasticizer can decrease the shrinkage-compensation action or self-stress of sulfo-aluminate expansive agent for concrete.When expansive agents are used together with superplasticizers,if the effects of expansive agent used separately are wanted to achieve,the used amount of expansive agents should be increased suitably.