The influences of light calcined magnesia expansive agent with replacement percentages of 0,3%,5% and fly ash with replacement percentages of 0,30% and 45% on the autogenous shrinkage of cement paste with water-to-binder ratio of 0.35 were studied. The effect of composite of light calined magnesia expansive agent and fly ash on autogenous shrinkage compensation of cement paste with low water-to binder ratio was discussed. The results show that both light calcined magnesia expansive agent and fly ash reduce the autogenous shrinkage of cement paste. A synergistic effect on the autogenous shrinkage reduction was ob served when the light calcined magnesia expansive agent and the fly ash were used together.%研究了轻烧氧化镁膨胀剂(0、3％、5％)和粉煤灰(0、30％、45％)对水胶比为0.35的水泥浆体自收缩性能的影响规律,并探讨了轻烧氧化镁膨胀剂和粉煤灰复合作用下对低水胶比水泥浆体自收缩联合补偿的减缩协同效应.结果表明:轻烧氧化镁和粉煤灰单独掺加时均能抑制水泥浆体的自收缩,二者复合双掺后对水泥浆体的自收缩抑制的幅度更大,表现出较好的减缩协同效应.
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