改性聚丙烯纤维砂浆和混凝土的性能试验

Research on performance of modified polypropylene fiber reinforced mortar and concrete

试验采用P.P.Kraai提出的砂浆及混凝土干燥收缩裂缝测试方法、混凝土力学性能试验、抗冻等耐久性能试验方法,研究了改性聚丙烯纤维对砂浆和混凝土性能的影响。结果表明,在混凝土中掺入一定量的改性聚丙烯纤维,混凝土的抗压强度略有下降;纤维在混凝土中形成的乱向支撑体系,产生了有效的增强效果,减少了裂缝的产生,提高了混凝土的抗折、抗拉强度,从而改善了混凝土抗裂、抗渗、抗冲击和抗冻等性能。

Effects of Polypropylene fiber on performance of concrete were studied experimentally applying mortar and concrete drying shrinkage crack test methods proposed by P.P.Kraai, mechanical properties and durability test methods. The results indicate that mixing a certain amount of fibers into concrete reduces compressive strength of concrete. Fibers in concrete offer an effective reinforcing effect of the random-oriented supporting system to decrease shrinkage cracks, increase flexural and tensile strength of concrete, and improve crack-lock performance, impermeability, impact-resistance and frost-heave-resistance.