路面PE纤维混凝土韧性和耐磨耗性试验研究

Experimental Study on Toughness and Wearing Resistance of PE Fiber Reinforced Concrete for Pavement

从提高混凝土路面韧性和耐磨耗性出发,分析了不同体积掺量(0,0.5%,1%)聚乙烯纤维和不同取代量(0,30%,50%)粉煤灰对混凝土弯拉强度、弯韧度指数、裂后强度以及耐磨耗性的影响。结果表明:聚乙烯纤维对弯拉强度和韧度的贡献较大;试件FFFO弯韧度指数比FFFZ高1.8倍;高掺粉煤灰(50%)和聚乙烯纤维(体积分数为1%)组合的28 d强度满足公路设计要求;聚丙烯纤维与粉煤灰(30%)的组合对耐磨耗性贡献最大;耐磨耗性随纤维掺量的增多而增强,与纤维掺量有二次函数的关系;纤维掺量对弯韧度指数和裂后强度的影响有相同的倾向。

To improve the toughness and wearing resistance of concrete pavement, the effects of different volume contents （0, O. 5%, 1.0% ） and different fly ash replacement rates （0, 30%, 50% ） on flexural strength, bending toughness index, post-crack strength and wearing resistance of fiber reinforced concrete are analyzed. The result shows that （1） PE fiber makes a great contribution to flexural strength and bending toughness ; （2） the bending toughness index of specimen FFFO 2. 8 times as large as that of specimen FFFZ ; （3） the 28 d strength of the fiber reinforced concrete with 50% fly ash and PE fiber （ volume fraction is 1.0% ） can meet highway design requirements; （4） the biggest contribution to wearing resistance comes from the combination of PE fiber and 30% fly ash ; （5） the wearing resistance is strengthened as the fiber content increasing, and it presents quadratic function relation; （6） the fiber content has the same effect trend on bending toughness index and post-crack strength.