聚合物改性水泥混凝土路用性能研究

Research on Road Performance of Cement Concrete Modified with Styrene-Butadiene Latex

聚合物改性水泥混凝土因同时具备沥青混凝土和水泥混凝土的优点而成为当前路面材料研究的重点。本文通过室内外试验的方法对聚合物改性水泥混凝土的路用性能进行研究,分析了聚合物改性水泥混凝土的抗压和抗弯拉强度、抗冲击和抗弯疲劳性能以及干燥收缩和抗渗性能等路用性能参数。研究结果表明:(1)聚合物改性水泥混凝土的抗压强度和抗弯拉强度均随聚合物掺加比例的增大而增大;当聚合物掺加比例为16%时,聚合物改性水泥混凝土的抗压强度与普通水泥混凝土基本相当,但其抗弯拉强度要明显大于普通混凝土的抗弯拉强度。(2)聚合物改性后水泥混凝土的抗冲击性能和抗弯拉疲劳性能均出现了显著的提升,且聚合物掺加比例等于12%时,其抗冲击性能最好。(3)聚合物改性水泥混凝土的干燥收缩率随聚合物掺量的增大出现了先减小后增大的变化趋势,而聚合物改性水泥混凝土的抗渗高度则随聚合物掺量的增大而逐渐减小。

The road performance of polymer modified cement concrete was studied by indoor and outdoor test methods. The Road performance parameters such as compressive and flexural tensile strength, impact and flexural fatigue resistance, dry shrinkage and resistance of polymer modified cement concrete were analyzed. The results show that:(1) The compressive strength and bending strength of polymer modified cement concrete increases with the increase of polymer blending ratio. When the polymer blending ratio is 16 %, the compressive strength of polymer modified cement concrete is basically the same as that of ordinary cement concrete, but its bending tensile strength is obviously larger than that of ordinary concrete.(2) The impact resistance and bending fatigue resistance of cement concrete after polymer modification has significantly improved, and the impact resistance of PE cement is the best when the polymer blending ratio is equal to 12 %.(3) The drying shrinkage rate of polymer modified cement concrete decreases first and then increases with the increase of polymer content, while the impermeability of polymer modified cement concrete increases with polymer content increases and gradually decrease.