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混凝土由于抗冻融能力低下,常常导致寒冷地区的结构物过早地发生耐久性破坏而被迫终止使用,由此造成的经济损失是难以估量的。因此,深入研究混凝土的抗冻融性并由此提出改善混凝土抗冻融能力的措施是很有必要的。从微细观角度入手,分析研究了混凝土宏观抗冻融性能和其内部孔结构之间的关系,结果表明,在混凝土内同时掺入适量粉煤灰和引气剂,在仍能满足设计强度要求的前提下,可以明显改善混凝土内部的孔结构,大大增加孔径在50nm以下少害和无害孔所占总孔的比例,显著提高混凝土的抗冻融能力。
Because of the low resistance to freeze-thaw, concrete often leads to premature endangerment of structures in cold regions and is forced to discontinue use. The resulting economic loss is immeasurable. Therefore, in-depth study of the antifreeze properties of concrete and the consequent measures to improve the anti-freeze-thaw ability of concrete is necessary. From the perspective of microstructure, the relationship between macroscopic freeze-thaw resistance of concrete and its internal pore structure is analyzed. The results show that while the appropriate amount of fly ash and air-entraining agent are mixed in concrete at the same time, Under the premise, can significantly improve the internal pore structure of concrete, greatly increasing the aperture less than 50nm harmless hole and the ratio of the total number of holes, significantly improve the anti-freeze-thaw ability of concrete.