摘要
研究了早期受冻环境下复合抗冻剂、受冻时间以及矿物掺合料对水泥基材料的力学性能、水化进程、水化产物以及孔结构分布的影响。结果表明,早期受冻时间越长,对早期强度发展的影响越大,强度越低,微观结构越不利于性能的发展;复合抗冻剂对水泥水化进程、孔结构分布有很大的改善作用,水化硅酸钙凝胶增多,Ca(OH)_2的量减少,孔隙率和最可几孔径降低,多害孔减少,无害孔增多;矿物掺合料在有激发剂存在时可对水化进程和孔结构分布进行改善,减少具有局部脆弱缺陷结构的Ca(OH)_2出现,促进团聚状凝胶的形成,并细化孔径,减少多害孔,提高早期抗冻性。
The influence of composite antifreeze, cold time and mineral admixture on the mechanical property of ce- ment-based material, hydration process, hydration products and pore distribution at early cold environment was re- searched. The results show that with the extension of early cold time, the impact on early strength is more serious, the low strength lead to the detrimental development of microstructure. Cement hydration process, pore structure are greatly im- proved by adding composite antifreeze, hydration calcium silicate gel increases, the amount of Ca（OH）2 decreases, the most probable aperture and porosity and harm hole decreases, harmless hole increase. The hydration process and pore structure distribution can be improved with the mineral admixture added with the presence of excitant, the weak defect structure of Ca（OH）2 decrease, the reunification of gel is promoted, the pore size is refined and the harmful hole is decreased, the early frost resistance is improved.
出处
《混凝土与水泥制品》
2017年第3期23-26,共4页
China Concrete and Cement Products
关键词
早期受冻
孔分布
矿物掺合料
水泥基材料
Early frost
Pore distribution
Mineral admixture
Cement-based material
