掺膨胀剂后碾压混凝土的抗冻特性研究  

Frost resistance characteristics of RCC mixed with expansive agent

作　　者：高培伟[1] 吴胜兴[1] 邓敏[2] 林萍华[1] 吴中如[1] 唐明述[2] 

机构地区：[1]河海大学土木工程学院,江苏南京210098 [2]南京工业大学材料学院,江苏南京210009

出　　处：《河海大学学报（自然科学版）》2005年第2期186-189,共4页Journal of Hohai University(Natural Sciences)

基　　金：国家自然科学基金资助项目(50278031);国家重点基金"973"资助项目(2001CB61070503)

摘　　要：混凝土的气泡间距系数与抗冻性有关,根据T.C.Powers间距系数小于0 25mm理论来评定碾压混凝土的抗冻与否并不完全适宜.选用适当的碾压混凝土配合比、外加剂,使用50%的Ⅰ级粉煤灰和8%膨胀剂,水胶比为0 48,气泡间距系数为0 28～0 40mm的碾压混凝土仍然可以抵抗300次的冻融循环.Although the air void spacing factor of RCC is related to its characteristic of frost resistance, it is unreasonable to evaluate the characteristic of frost resistance of RCC only based on whether the air void spacing factor is less than (0.25?mm ) according to T. C. Powers' theory. The research shows that, by selection of suitable mixproportions of additives for RCC, i.e. 50% of grade-I fly ash, 8% of HNM additive, and 0.48 of water-binder ratio, RCC with the air void spacing factor in the range of 0.28—0.40?mm can still resist 300 times' freezing-thawing cycles.

关 键 词：碾压混凝土 间距系数 膨胀剂 冻融循环 

分 类 号：TU528[建筑科学—建筑技术科学]