不同混杂纤维掺量混凝土高温后的力学性能.pdfVIP

第36卷 第4期 华 中 科 技 大 学 学 报 (自然科学版) VolI 36 NO．4 2008住 4月 J．Huazhong Univ．of Sci．＆ Tech．(Natural Science Edition) Apr． 2008 不同混杂纤维掺量混凝土高温后的力学性能 刘沐宇 程 龙 丁庆军 胡曙光 (武汉理工大学a道路桥梁与结构工程湖北省重点实验室； b材料科学与工程学院，湖北 武汉430070) 摘要：通过对 120多块立方体混凝土试块进行高温后力学性能试验，测定聚丙烯纤维和混杂纤维(聚丙烯纤 维和钢纤维)增韧高性能混凝土的高温残余强度，研究聚丙烯纤维和混杂纤维对混凝土在800 C高温残余力 学性能的影响以及不同含量的钢纤维对混杂纤维混凝土高温性能的影响．实验结果表明：800℃后 昆杂纤维 昆凝土残余抗压强度剩余54 ，抗拉强度剩余 32 ，钢纤维能有效提高高性能混凝土的残余强度，聚丙烯纤 维对高性能混凝土残余力学性能的影响很小． 关 键 词：土木工程；高性能}昆凝土；高温；聚丙烯纤维；钢纤维；残余力学性能 中图分类号：TU528．58 文献标识码：A 文章编号：1671～4512(2008)04—0123-03 Mechanics performance of hybrid fibers concrete with different mixture after exposed to high temperature Liu Muyu Cheng Long Ding Qingj“n Hu Shuguang (a Hubei Key Laboratory of Roadway Bridge and Structure Engineering；b School of Material Science and Engineering，WuhanUniversity of Technology，Wuhan 430070，China) Abstract：An experimental investigation of residual mechanical properties of fiber—toughened high per— formance concrete was done after exposed to high temperatures．The residual strength was tested on concrete containing polypropylene fibers and hybrid fibers(polypropylene fibers and steel fibers)，af— ter the residual mechanical properties of．1 20 concrete specimens were studied experimentally．The effect of steel fibers in different content was also studied on hybrid fiber——toughened performance con—— crete．The experimental results revealed that by elevating to 800℃。the residual compressive energy of hybrid fibers concrete remains 54 and the value of fracture energy is 32 ．The steel fibers could improve residual mechanical properties of high performance concrete，whereas the presence of poly- propylene fibers had little effect on residual mechanical properties of high