黑龙江科技学院学报2013，Vol.23Issue(1)：63-66,4.
早期受冻温度对负温混凝土微观结构与强度的影响
Effect of freezing temperature on microstructure and compressive strength of negative temperature concrete
摘要
Abstract
Aimed at reducing effect of the negative temperature on internal damage to the concrete structure, the pore size distribution and the microstructure of negative temperature concrete was studied with different temperature, combining with some testing methods, such as MIP and SEM. Moreover, the change of the compressive strength was also studied with different ages. In addition, the relationship between the microstructure and the macro-mechanical properties on negative temperature concrete was explored further with different freezing temperature. It indicated that the lower the early curing temperature, the looser the original structure of cement paste; the total volume of gel pore whose pore size was less than 20 nm was decreasing apparently, and the compressive strength declined. When changing to standard curing, the pore size trended to be thinner, the compressive strength was increasing sharply. The concrete was cured from - 5 ℃ to standard curing, the volume of pore that was less than 200 nm was equal to that of the concrete with the standard curing in the age of 28 d, so was the compressive strength. However, the volume of the macro pore of the concrete curing under - 10 ℃ and - 15 ℃was greater than the concrete curing the standard condition, the compressive strength was less.关键词
早期受冻/混凝土/微观结构/抗压强度Key words
negative temperature/concrete/microstructure/compressive strength分类
建筑与水利引用本文复制引用
董淑慧,冯德成,江守恒,朱卫中..早期受冻温度对负温混凝土微观结构与强度的影响[J].黑龙江科技学院学报,2013,23(1):63-66,4.
