3℃养护下引气混凝土早期强度及抗冻性能研究  

RESEARCH ON EARLY STRENGTH AND FREEZE-PROOF RESISTANCE OF AIR-ENTRAINED CONCRETE UNDER 3 ℃ CURING

作　　者：张凯[1] 王起才[1] 王庆石[1] 李盛[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：《工业建筑》2015年第2期5-9,共5页Industrial Construction

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

摘　　要：采用强度试验、压汞法、气孔分析法、快速冻融法,以低温(3±0.2)℃养护下引气混凝土为研究对象,对混凝土的强度、孔隙结构及抗冻耐久性进行了研究。结果表明:在3℃养护下,随着含气量的提高,孔径均匀分布,显著改善了混凝土的内部孔隙结构,但比标准养护条件下同等含气量混凝土的孔结构粗化。为更好地阐述混凝土实际强度受含气量的影响,由孔隙结构可进一步推算出3℃养护下混凝土的实际抗压强度,并与标准养护条件下实际抗压强度对比,显示两者之间的不同。The strength, the pore structure and freeze-proof durability of air-entrained concrete under 3 ℃temperature curing and with different air contents were researched by taking air-entrained concrete under low temperature curing (3 ±0.2 ) ℃ as the object, adopting strength test mercury intrusion method, pore analytical method and fast freeze-thaw method.The results showed that when concrete of 3 ℃ temperature curing, as the air content was increased, the distribution of pore diameter was uniform and the interior pore structure of concrete was improved significantly, however, the pore structure under the room curing at the same air content of concrete was lower than under 3 ℃curing.In order to expound the influence of air content on the actual concrete strength in an even better fashion, the concrete compressive strength under 3 ℃curing can further be estimated by pore structure, which was compared with the room curing actual compressive strength, showing the difference between the two.

关 键 词：混凝土 3℃养护 含气量 孔隙结构 实际强度 

分 类 号：TU528[建筑科学—建筑技术科学]