Influence of superplasticizer on performance of sulfo-aluminate expansion agent under same fluidity

The influence of naphthalene series,amino sulfonic and polycarboxylate superplasticizer on the performance of sulfo-aluminate expansion agent were investigated under the condition of same fluidity.The results show that superplasticizer used together with sulfo-aluminate expansion agent can enhance the compression strength at 28 d,but reduce restrained-expansion rate of expansion agent,and increase expansion index in water cure at 28 d,thus resulting in the reduction of efficient expansion energy of expansion agent.Therefore with same amount of expansion agent,compound use superplasticizer can decrease the shrinkage-compensation action or self-stress of sulfo-aluminate expansion agent for concrete.When expansion agent is used together with superplasticizer,the amount of expansion agent should be increased suitably in order to obtain the same expansion effect as adding single expansion agent.