由高韧性水泥基复合材料铺设的混凝土路面在长期的风吹日晒下逐渐老化,且界面结合强度不够,容易出现剥落或开裂,导致路面损坏.为了提高混凝土路面的抗老化性能,设计聚合物改性高韧性水泥基复合材料混凝土路面抗老化性能试验研究.以南方水泥厂生产的硅酸盐水泥和HY-3硫铝酸盐水泥作为高韧性水泥基材料,制备水泥基复合材料,以醋酸乙烯-乙烯乳液(VAE)为聚合物改进材料,对水泥基复合材料改性,对聚合物改性高韧性水泥基复合材料建造的混凝土路面进行抗老化性能测试.测试结果表明,随着聚合物含量的增加,老化后混凝土路面相位角逐渐下降,抗车辙因子和复合剪切模量呈现出增大-减小的趋势,混凝土路面的疲劳强度和延度逐渐下降.随着温度的升高,老化后混凝土路面的相位角逐渐减小,聚合物对混凝土路面高温性能的改善效果越来越差,混凝土路面的复合剪切模量逐渐减小,聚合物对老化后混凝土路面疲劳性能的提高效果逐渐上升.
The concrete pavement paved with high toughness cement-based composite materials gradually ages under long-term wind and sun ex-posure,and the interface bonding strength is insufficient,which is prone to peeling or cracking,leading to pavement damage.In order to improve the anti-aging performance of concrete pavement,an experimental study on anti-aging performance of polymer modified high toughness cement-based composite concrete pavement is designed.Portland cement and HY-3 sulphoaluminate cement produced by Nanfang Cement Plant are used as high toughness cement-based materials to prepare cement-based composites.The ethylene acetate-ethylene emulsion(VAE)is used as polymer improve-ment materials to modify the cement-based composites.The anti-aging performance of concrete pavement constructed by polymer modified high toughness cement-based composites is tested.The test results indicate that as the polymer content increases,the phase angle of aged concrete pave-ment gradually decreases,and the anti-rutting factor and composite shear modulus show an increasing-decreasing trend.The fatigue strength and ductility of concrete pavement gradually decrease.As the temperature increases,the phase angle of aged concrete pavement gradually decreases,and the improvement effect of polymers on the high-temperature performance of concrete pavement becomes worse.The composite shear modulus of con-crete pavement gradually decreases,and the improvement effect of polymers on the fatigue performance of aged concrete pavement gradually increases.