纤维高性能混凝土力学及耐久性能  

Mechanical Properties and Durability of Fiber Reinforced High Performance Concrete

作　　者：刘伟宝[1,2] 陆采荣[1,2] 梅国兴[1,2] 王珩[1,2] 戈雪良[1,2] 杨虎[1,2] LIU Wei-bao LU Cai-rong MEI Guo-xing WANG Heng GE Xue-liang YANG Hu(a. State Key Laboratory of Hydrology Water Resources and Hydraulic Engineerin b. R＆D Center of Hydropower Engineering Safety and Environmental Technology, NEA, Nanjing Hydraulic Research Institute, Nanjing 210029, China)

机构地区：[1]南京水利科学研究院水文水资源与水利工程科学国家重点实验室,江苏南京210029 [2]南京水利科学研究院国家能源水电工程安全与环境技术研发中心,江苏南京210029

出　　处：《土木工程与管理学报》2017年第2期37-40,共4页Journal of Civil Engineering and Management

基　　金：国家自然科学基金(51509167;51579155);江苏省自然科学基金(BK20150076)

摘　　要：结合某隧道工程跨海区间衬砌结构混凝土所处环境类别和作用等级,对不同纤维长度的聚丙烯纤维混凝土抗压性能及抗氯离子侵蚀耐久性能开展对比试验研究,提出掺加聚丙烯纤维的高性能混凝土方案,针对该方案配合比开展了轴心抗压试验、轴心抗拉试验、抗渗试验及干缩试验。结果表明:在早龄期(3~7 d),纤维混凝土的抗压强度略低于基准组抗压强度,而在后期(7~90 d),纤维混凝土抗压强度逐渐超过基准组抗压强度;28 d龄期混凝土抗压强度随纤维掺量的增加呈现增长的趋势;另外,当纤维掺量在1.5%以内时,随着纤维掺量的增加,28 d和90 d氯离子扩散系数皆随纤维掺量的增加而增加;纤维长度为6 mm的混凝土氯离子扩散系数略大于纤维长度为12 mm的混凝土氯离子扩散系数。Based on environmental categories and levels of lining concrete of cross sea region of one tunnel engineering,comparative research on compression test and chloride resistanceproperty of polypropylene fiber reinforced high performance concrete（FRHPC） with different fiber length was performed,and then a scheme of high performance concrete with polypropylene fiber is proposed.Axial compression test,axial tensile test,penetration test and drying shrinkage test were carried out for the scheme.The results indicate that the compressive strength of FRHPC was slightly lower than that of the contrast group in early durations（3~7 d）,however,in later durations（7~90 d）compressive strength of FRHPC increasingly exceeded.The compressive strength increases with fiber content in 28 d.Besides,chloride ion diffusion coefficient increases with fiber content in both 28 d and 90 d when fiber contenet is below 1.5%.Chloride ion diffusion coefficient of FRHPC with fiber length of 6mm is greater than that of FRHPC with fiber length of 12 mm.

关 键 词：隧道工程 纤维混凝土 纤维长度 力学性能 耐久性 

分 类 号：TV431.3[水利工程—水工结构工程]