负温条件和矿物掺合料耦合作用对混凝土强度和抗渗性影响  

Influence of negative temperature condition and mineral admixture coupling on strength and impermeability of concrete

作　　者：郭海贞 张戎令[1,2,3] 王起才 代金鹏[1,3] 娄许煜[1] 谢智刚 GUO Haizhen;ZHANG Rongling;WANG Qicai;DAI Jinpeng;LOU Xuyu;XIE Zhigang(Key Laboratory of Road&Bridges and Underground Engineering of Gansu Province,Lanzhou Jiaotong University,Lanzhou 730070,China;Cardiff University,School of Civil Engineering,Cardiff,UK,CF24 3AB;National and Provincial Joint Engineering Laboratory of Road&Bridge Disaster Prevention and Control,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学道桥工程灾害防治技术国家地方联合工程实验室,甘肃兰州730070 [2]卡迪夫大学工程学院,英国卡迪夫CF24 3AB [3]兰州交通大学甘肃省道路桥梁与地下工程重点实验室,甘肃兰州730070

出　　处：《铁道科学与工程学报》2019年第10期2475-2482,共8页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51268032,51768033);青年人才托举工程(2015QNRC001);飞天学者特聘计划;长江学者和创新团队发展计划滚动支持项目(IRT_15R29);中国交建2016年创新平台建设应用基础研究资助项目(2016-ZJKJ-PTJS04);甘肃省高校协同创新科技团队支持计划资助项目(2017C-08);陇原青年创新创业人才团队计划

摘　　要：为研究矿物掺合料在负温养护条件下对混凝土抗压强度和抗渗性的影响规律,并从微观角度解释其内在机理,进行-3℃养护条件下双掺不同掺量粉煤灰、矿粉和三掺不同掺量粉煤灰、矿粉、硅灰对混凝土抗压强度、孔隙结构和电通量的试验。试验结果表明:在-3℃养护条件下,掺入矿物掺合料均降低了混凝土早期的抗压强度,但在双掺10%粉煤灰和10%矿粉的基础上,掺入不同掺量的硅灰,掺量为1%时,可有效改善混凝土早期抗压强度;从其渗透性来看,矿物掺合料可以有效改善混凝土的细观孔结构和抗氯离子渗透性能。In order to study the influence of mineral admixtures on the compressive strength and impermeability of concrete under negative temperature curing and to explain its internal mechanism from a microscopic point of view,the compressive strength,pore structure and electric flux of concrete cured at 3℃were tested by mixing fly ash,slag powder and silica fume with different content of fly ash,slag and silica fume.The test results show that the early compressive strength of concrete decreases with the addition of mineral admixtures under the curing condition of 3℃,but on the basis of mixing 10%fly ash and 10%mineral powder,mixing different amount of silica fume with 1%content can effectively improve the early compressive strength of concrete.respectively From the perspective of permeability,mineral admixtures can effectively improve the mesoporous structure and chlorine resistance of concrete ion permeability.

关 键 词：负温条件 混凝土 矿物掺合料 强度 抗氯离子渗透 微观机理 

分 类 号：TU528[建筑科学—建筑技术科学]