研究了石灰石复合超细矿物掺合料对混凝土工作性和强度的影响.结果表明:在坍落度相近的情况下,混凝土的用水量随着石灰石粉掺量的增加而降低,石灰石粉可减少混凝土的用水量,降低水胶比,同时也保证了混凝土的工作性；复合矿物掺合料所选用低等级粉煤灰和石灰石粉的比例宜为2:8；当水泥用量为288kg/m3,复合矿物掺合料为192 kg/m3,混凝土28d强度可达到55 MPa以上；当水泥用量为240kg/m3,复合矿物掺合料为240 kg/m3,混凝土28d强度可达到50MPa以上.%In this paper, the influences of limestone composite superfine mineral admixture on workability and strength of concrete are mainly researched. The results indicate that in the case of similar slump, with the increasing of limestone powder, the water consumption of concrete decreases and the limestone powder can decrease the water consumption of concrete and water-binder ratio, meanwhile, it can ensure the workability of concrete. The optimum ratio of low grade fly ash and limestone powder which composite mineral admixture selets is 2:8. When cement content is 288 kg/m3 and composite mineral admixture content is 192 kg/m3, the 28-day strength of concrete can reach over 55 Mpa; While cement content is 240 kg/m3 and composite mineral admixture content is 240 kg/m3, the 28-day strength of concrete can reach more than 50 Mpa.
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