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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 effects of composite cryoprotectants, freezing time and mineral admixture on the mechanical properties, hydration process, hydration products and pore structure distribution of cement-based materials were studied. The results showed that the longer the initial freezing time, the greater the influence on the early strength development. The lower the strength, the less conducive to the development of the microstructure. The composite antifreezing agent greatly improved the cement hydration process and pore structure distribution , The amount of Ca (OH) 2 decreases, the porosity and the most probable pore diameter decrease, the number of porous pores decreases, and the number of harmless pores increases; mineral admixtures may be present in the presence of an activator The hydration process and pore structure distribution were improved, Ca (OH) 2 with local fragile structure was reduced, the formation of agglomerated gel was promoted, the pore size was reduced, the number of multi-pore was reduced and the early frost resistance was improved.