硝酸侵蚀环境喷射混凝土抗冻性试验研究  

Experimental study on frost resistance of sprayed concrete under coupled nitric acid erosion and freeze-thaw cycles

作　　者：蒿洋 牛荻涛[1,2,3] 王家滨 

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]西部绿色建筑重点实验室协同创新中心,陕西西安710055 [3]结构工程与抗震教育部重点实验室,陕西西安710055

出　　处：《混凝土》2017年第12期154-156,共3页Concrete

基　　金：国家自然科学基金(51278403);教育部创新团队发展计划(IRT13089)

摘　　要：为研究硝酸侵蚀环境下喷射混凝土的抗冻性,对喷射混凝土和钢纤维喷射混凝土进行硝酸溶液快速冻融试验,并与同配合比普通模筑混凝土对比,得出三者抗冻性的差异,通过分析混凝土含气量、混凝土孔隙平均弦长探究混凝土抗冻性差异的机理,结果表明:掺加钢纤维能有效改善喷射混凝土抗冻性能;喷射混凝土初始含气量高,孔径弦长小,这是造成其抗冻性优于普通模筑混凝土的原因。To investigate the frost resistance of sprayed concrete under nitric acid erosion and theincorporation of steel fiber.By rapid freezing and thawing test to comparison with the different of frost resistance of sprayed concrete, steel fiber reinforced sprayed concrete and ordinary concrete and analyzing the mechanism of air content, exploring the difference of concrete frost resistance of concrete pore av- erage chord length show the results, adding steel fiber can effectively improve the frost resistance of sprayed concrete; The sprayed con- crete of high air content, small average chord length, which is the cause of the frost resistance is better than that of ordinary concrete.

关 键 词：硝酸侵蚀 喷射混凝土 抗冻性 

分 类 号：TU528.53[建筑科学—建筑技术科学]