热害对混凝土耐久性能的影响

The influence of concrete durability caused by the thermal damage

混凝土碳化、氯离子侵蚀、硫酸盐腐蚀以及碱集料反应严重影响混凝土结构的耐久性。在热环境下(<100℃),这些因素是否会加重几种侵蚀对建筑工程的损伤,增加对结构耐久性的影响,从而使建筑物寿命进一步减少?本文通过对国内外学者有关混凝土耐久性研究资料的分析,结合笔者已经做过的一些探索性工作,对热害对侵蚀型耐久性影响的作用、程度及机理作一分析评述。得出初步结论 :其它条件相同的情况下,高温增加了上述几方面侵蚀对混凝土的损伤,加速了性能的劣化,对耐久性不利。

Concrete carbonation,the chloride ion erosion,sulfate corrosion,and the alkali aggregate reaction seriously affect the durability of the concrete structure.Will these factors make the building life reduce further through aggravating the damage caused by several erosion in construction engineering and increasing the influence on the durability of structure in the thermal environment(<100℃)? The author analyze the effect,degree and mechanism of the impact on type of erosion durability in the thermal environment through the analysis of the concrete durability research materials prepared by the domestic and foreign scholars as well as some exploratory work did by the author.The preliminary conclusion is that if other things equal,high temperature aggravated damage caused by the above several aspects of erosion in concrete and accelerated the degradation of performance which is against the durability.