微珠对水泥基胶凝材料性能的影响研究

Research on the effect of miscrosphere on properties of cementing materials

对比研究了不同掺量D50为1.0μm微珠对复合水泥干粉压实体堆积密度、复合水泥浆体工作性能和力学性能的影响规律。结果表明：微珠掺量在0~40%时,复合水泥干粉压实体堆积密度与复合水泥浆体的流动度具有较好的对应关系,复合水泥干粉压实体堆积密实度越高,复合水泥浆体流动度越大;当微珠掺量30%时,复合水泥粉体堆积密度最高,空隙率最低,复合水泥浆体流动度最高,复合水泥浆体3、7 d抗压强度较低,28 d抗压强度超过纯水泥浆体,60 d抗压强度同比其他复合水泥浆体最高。

The effects of different contents of miscrosphere with 1.0 um median particle size on powder pressure entity dense packing density,workability and mechanical performance of composite cement paste were studied based on comparative research.The results showed that when the content of miscrosphere was between 0-40%, dense packing density of powder pressure entity was related closely to fluidity of fresh cement paste.The higher the dense packing density of powder pressure entity, the greater the fluidity of fresh cement paste. When the content of miscrosphere was 30%, composite cementing materials achieves the densest packing density which means the lowest void ratio and thus leads to the greatest fluidity of fresh composite cement paste.The 3 d and 7 d compressive strength of composite cement paste with 30% miscrosphere was low,but the 28 d compressive strength exceeded ordinary cement paste,and the 60 d compressive strength was much higher than any other composite cement paste.