摘要
为研究高温前后聚丙烯纤维直径对高强混凝土的相对残余抗压强度及相对渗透能力的影响，在C60混凝土中分别掺入直径为25bμm和35μm的聚丙烯纤维，进行了抗压性能及抗渗性能试验。试验结果表明，600℃以下。掺聚丙烯纤维的高强混凝土相对残余抗压强度略高于素混凝土；6000c以上，结果相反。同条件下，直径为25μm的聚丙烯纤维的贡献略优于直径为35μm的聚丙烯纤维。快速氯离子迁移系数法说明，与素混凝土相比，掺入聚丙烯纤维使得高强混凝土高温（100-700℃）作用后的抗渗性提高，其中，掺入直径为25μm的聚丙烯纤维高强混凝土的相对渗透能力低于掺入直径为35μm的聚丙烯纤维高强混凝土。
C60 concrete was added with 025μm and 035μm polypropylene fibers and the compressive behavior and permeability resistance of the concrete was tested to study the effect of polypropylene fiber diameter on the relative residu-al compressive strength and permeability of high strength concrete （HSC） before and after high temperature. The results show that the relative residual compressive strength of HSC with polypropylene fibers is slightly higher than that of the plain concrete below 600℃, while the result is opposite over 600℃. Under the same conditions, the contribution of Ф25μm polypropylene fiber is a little bigger than that of 035μm polypropylene fiber to the relative residual compressive strength of HSC. Compared with plain concrete, polypropylene fibers can increase the permeability resistance of HSC when exposed to a high temperature （100-700℃）, in which the relative permeability of HSC with Ф25μm polypropylene fibers is lower than that of HSC with Ф35μm according to the results of rapid chloride ion migration coefficient method.
出处
《混凝土与水泥制品》
北大核心
2013年第9期48-50,共3页
China Concrete and Cement Products
基金
国家自然科学基金项目(51278325)
山西省自然科学基金项目(2011011024-2)
关键词
聚丙烯纤维直径
高强混凝土
高温
相对残余抗压强度
相对渗透能力
Polypropylene fiber diameter
High strength concrete
High temperature
Relative residual compressivestrength
Relative permeability
