石灰石复合超细矿物掺合料对混凝土工作性和强度影响的研究  

Research on Influence of Limestone Composite Superfine Mineral Admixture on Workability and Strength of Concrete

作　　者：刘娟红[1] 文烨[1] 宋少民[2] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]北京建筑工程学院土木与交通工程学院,北京100044

出　　处：《粉煤灰综合利用》2011年第5期27-30,共4页Fly Ash Comprehensive Utilization

摘　　要：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55MPa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/m^3 and composite mineral admixture content is 192 kg/m^3 , 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/m^3 , the 28-day strength of concrete can reach more than 50 MPa.

关 键 词：石灰石粉 粉煤灰 混凝土 工作性 强度 

分 类 号：TU528[建筑科学—建筑技术科学]