含气量对低温养护下混凝土早期实际强度及抗冻性能的影响研究  

Research of Air Content on the Effect of Concrete Early Actual Strength and Frost Resistance under Low Temperature Curing

作　　者：张凯[1] 王起才[1] 王庆石[1] 李建新[1] 陈松[1] 崔建龙 

机构地区：[1]兰州交通大学土木工程学院,兰州730070

出　　处：《硅酸盐通报》2015年第3期677-683,共7页Bulletin of the Chinese Ceramic Society

基　　金：长江学者和创新团队发展计划(IRT1139);国家自然科学基金(51268032);铁道部科技研究开发计划(2010G019-A)

摘　　要：本文以低温(3±0.2)℃养护下引气混凝土为研究对象,采用压汞法、气孔分析法、快速冻融法测试了不同含气量低温养护下混凝土的孔隙结构及抗冻耐久性。结果表明:掺入引气剂,可使混凝土孔隙率、总孔体积、总孔面积增加,平均孔径、孔间距系数减小,孔径均匀分布,显著改善混凝土的内部孔隙结构,明显提高混凝土的抗冻耐久性。为更好的阐述含气量对混凝土实际强度的影响,本文通过测出的气孔结构,进一步推算出低温养护下混凝土的实际抗压强度,通过理论计算得出,随着含气量的增大,实际强度降低。The pore structure and frost durability of concrete with different air contents by taking airentrained concrete under low temperature curing （3 -0.2 ） ℃ were tested adopting mercury intrusion method, pore analytical method and fast freeze-thaw method. Experimental results showed that when incorporating into the air-entraining agent, the porosity of the concrete, the total pore volume and total pore area increase, while the average pore size and pore spacing factor were decrease. The distribution of pore diameter was uniform. The interior pore structure of concrete and the frost durability of concrete are improved significantly. In order to better expound the influence of air content on the actual concrete strength, this text was calculated the actual concrete compressive strength under low temperature curing by measuring the pore structure. Theoretical calculation showed that the actual concrete compressive strength declined with the increasing of air content.

关 键 词：混凝土 低温养护 含气量 孔隙结构 抗冻耐久性 

分 类 号：TU528[建筑科学—建筑技术科学]