摘要
针对传统水泥基材料存在的强度较低、功能单一、成本偏高、工艺复杂、收缩较大等问题,以多种活性粉末为基础材料,通过单因素、正交试验及极差分析方法,确定了以强度性能为指标的高强水泥基材料质量配合比为水泥∶FA∶硅粉∶砂∶PP∶减水剂∶UEA:硅溶胶∶SBR∶水=100∶12∶6∶46.75∶0.08∶1.36∶3∶0.7∶1.3∶28.5,28d抗折/抗压强度达到12.4MPa/110.06MPa。在此基础上,通过干缩性能试验、DSC、SEM、XRD等方法,对高强水泥基材料性能进行了进一步分析。研究结果表明,掺入UEA的28d干缩率为0.176%,比0%UEA掺量的干缩值减少了0.077%;高强水泥基材料二次水化程度较低,但微观上堆积良好、结构致密均匀的超细粉胶凝体系保证了其高强、低脆的性能。
Aiming at the problems such as low strength, single function, high cost, complicated process and large shrinkage, the traditional cement-based materials are based on a va- riety of active powder, optimal mix proportion of high strength cementitious materials was determined with the index of strength by single-factor, orthogonal experiments and range analysis method, which was： cement： FA ： silicon fume ： sand ： PP ： water-reduce agent ： UEA： silica sol＂ SBR＂ water=100 ： 12 ： 6 ： 46.75 ： 0.08 ： 1.36 ： 3 ： 0.7 ： 1.3 ： 28.5, and it is 28 d compressive/flexural strength achieved 12.4 MPa/110.06 MPa. On the basis of optimal mix proportion, through the drying shrinkage properties test, DSC, SEM, XRD and other methods, further analysis of the properties of high strength cement based materials, which show that the drying shrinkage of specimen added 3% UEA was decreased 0. 077% compared with specimen added 0% UEA to 0. 176%. And the secondary hydration level of high strength eementitious materials is poor, but the high strength and toughness performance were obtained from favorable accumulation and densified homogeneous structure in the microscopic dimension.
出处
《长沙理工大学学报（自然科学版）》
CAS
2017年第2期20-25,共6页
Journal of Changsha University of Science and Technology:Natural Science
基金
湖南省教育厅重点科研项目(14A001)
湖南省水利科技计划项目(湘水科计[2016]194-40)
关键词
活性粉末
配合比
抗折强度
抗压强度
干缩性能
微观结构
active powder
mix proportion
flexural strength
compressive strength
dryingshrinkage properties
microscopic structure
