单面盐冻-干湿循环下玄武岩纤维混凝土劈裂抗拉强度与微观结构研究  

Splitting tensile strength and microstructure of basalt fiber reinforced concrete under single side salt-freeze-dry-wet cycle

作　　者：曾浩 张晋 顾志聪 苏鑫 崇银鹏 张凯 ZENG Hao;ZHANG Jin;GU Zhicong;SU Xin;CHONG Yinpeng;ZHANG Kai(School of Civil Architecture and Environment,Hubei University of Technology,Wuhan 430068,China;School of Civil Engineering,Guangzhou University,Guangzhou 510900,China)

机构地区：[1]湖北工业大学土木建筑与环境学院,湖北武汉430068 [2]广州大学土木工程学院,广东广州510900

出　　处：《混凝土》2022年第9期20-24,共5页Concrete

基　　金：国家自然科学基金(51508171);湖北省自然科学基金(2020CFB860);湖北省桥梁基础安全监测技术与装备工程技术研究中心开放基金(QLZX2014001);湖北工业大学高层次人才基金(BSQD13042)。

摘　　要：研究了普通混凝土与玄武岩纤维混凝土在单面盐冻-干湿循环下的劈裂抗拉强度与微观结构。结果表明,单面盐冻-干湿循环下混凝土的劈裂抗拉强度损失明显,玄武岩纤维的掺入有效降低了劈裂抗拉强度损失率。单面盐冻-干湿循环会造成混凝土水化产物分解,影响胶凝材料与纤维的协同作用,但对纤维及其构建的三维网络影响较小。玄武岩纤维的掺入降低了混凝土的孔隙率,改变了混凝土的孔径分布。同时,玄武岩纤维的掺入改善了混凝土在单面盐冻-干湿循环下的孔径粗化,且对多害孔作用最为明显。The splitting tensile strength and microstructure of ordinary concrete and basalt fiber reinforced concrete under single side salt-freeze-dry-wet cycle were studied.The results show that the splitting tensile strength of concrete is seriously damaged by single side salt-freeze-dry-wet cycle,and the loss rate of splitting tensile strength of concrete is effectively reduced by the addition of basalt fiber.The single-side salt-freeze-dry-wet cycle can cause the decomposition of concrete hydration products and affect the synergistic effect of cementing materials and fibers,but it has little influence on fibers and their three-dimensional networks.The addition of basalt fiber reduces the porosity of concrete and changes the pore size distribution of concrete.The basalt fiber can improve the coarsening of concrete pore size under the single side salt freeze-dry-wet cycle,and has the most obvious effect on multi-damage pores.

关 键 词：玄武岩纤维混凝土 单面盐冻 干湿循环 劈裂抗拉强度 微观结构 孔隙率 孔径分布 

分 类 号：TU528.572[建筑科学—建筑技术科学]