3℃下含气量对混凝土强度、孔结构及抗冻性的影响  

Effect of Air Content on the Strength,Pore Structure and Frost Resistance of Concrete at 3 ℃

作　　者：王庆石[1] 王起才[1] 张凯[1] 李伟龙[1] 李建新[1] 

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615-620,共6页Bulletin of the Chinese Ceramic Society

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

摘　　要：本文通过混凝土强度试验、压汞试验、孔间距系数试验和冻融循环试验,对低温(3±0.2)℃养护下不同含气量混凝土的强度、孔结构及抗冻性进行了研究。结果表明,低温养护下混凝土的强度比标准养护下混凝土的强度低;随着含气量的增大,混凝土净浆的总孔体积、总孔面积、比表面积和骨架密度均增大,但硬化后混凝土的孔间距系数和平均孔径减小,孔径分布更加均匀合理;随着含气量的增大,混凝土的抗冻性提高,但混凝土的强度会降低,所以含气量存在一个合理的范围。This article was through concrete strength test, mercury test, hole spacing coefficient test and freeze-thaw cycle test, under different air content of concrete strength, pore structure and frost resistance were studied at the low temperature （3 ±0.2） ℃. The results are showed that the strength of the low temperature curing of concrete is lower than under the standard curing of concrete strength ; With air content increasing, the total pore volume of concrete paste, the total pore area, surface area and skeletal density are increased, but the hardening hole spacing coefficient and the average pore diameter concrete are decreased, pore size distribution is more uniform and reasonable; with air content increasing, concrete frost resistance is increased, but the strength of concrete is reduced, so that there is a reasonable containing air range.

关 键 词：低温 混凝土 含气量 孔结构 抗冻性 

分 类 号：TB33[一般工业技术—材料科学与工程]