基于反向填充制备低碳水泥基材料  

Preparation of Low Carbon Cement-based Materials Based on Reverse Filling

作　　者：韩保东 刘阳 魏士华 郑克仁[1] HAN Baodong;LIU Yang;WEI Shihua;ZHENG Keren(School of Civil Engineering,Central South University,Changsha 410075,China)

机构地区：[1]中南大学土木工程学院,长沙410075

出　　处：《硅酸盐通报》2020年第2期389-395,401,共8页Bulletin of the Chinese Ceramic Society

摘　　要：为了提高水泥利用效率,降低水泥基材料的碳排放,提出基于反向填充实现紧密堆积的设想,并将其应用于超细水泥-石灰石二元粉体体系中。采用可压缩模型计算和最小需水量法实测超细水泥-石灰石二元粉体体系的堆积密实度。结果表明:超细水泥在25%掺量时,体系堆积密实度达到最大;提高石灰石粉-超细水泥的粒径比,可使体系堆积密实度进一步提高。达到最大堆积密实度的超细水泥-石灰石胶凝体系水灰比为0.44,水固比可降低到0.11,并具有良好的流动性。硬化浆体中水泥充分水化,其90 d抗压强度可达81.5 MPa。所制备的反向填充水泥基胶凝材料具有显著的低碳特点,其单位质量胶凝材料碳排放量约为超高性能混凝土基体材料平均值的一半。In order to improve the utilization efficiency of cement and reduce the carbon emission of cement-based materials, the assumption of dense packing based on reverse filling was proposed and applied to the superfine cement-limestone binary powder system. The compressive packing model was used to calculate and minimum water demand method to measure the packing density of superfine cement-limestone binary powder system. The results show that the packing density of the system reach maximum when superfine cement is at 25% content, and the increase in particle size of limestone powder can furtherly improve the packing density of the system. The superfine cement-limestone cementitious system with the maximum packing density have a water to cement ratio of 0.44, a water to solid ratio of 0.11, and a good flowability is obtained as well. The cement in hardened paste is fully hydrated, thus the compressive strength at 90 d reaches 81.5 MPa. The prepared reverse filling cement-based cementitious material has a remarkable low-carbon characteristic, and its carbon emission of cementitious materials per unit mass is about half of the average value of ultra-high performance concrete matrix materials.

关 键 词：反向填充 堆积密实度 碳排放 力学性能 水泥利用效率 

分 类 号：TU528[建筑科学—建筑技术科学]