浇筑式聚醚型聚氨酯混凝土的制备及与浇筑式沥青混凝土性能对比

Development and Performance Evaluation of Guss Polyether Polyurethane Concrete

浇筑式沥青混凝土由于其突出的变形追随性而广泛应用于长大桥梁的桥面铺装中,但该材料在高温稳定性及节能减排方面存在明显不足。而聚氨酯混凝土因其路用性能和环保特性,逐渐成为研究的热点。采用课题组自主研发的聚醚型聚氨酯代替沥青配制了浇筑式混凝土GPC-10,并将其与浇筑式沥青混凝土GA-10进行了性能对比评价。首先,以聚醚型聚氨酯为胶结料,采用GA-10的矿料级配,配制了GPC-10,并根据其裹敷状态及流动性确定了胶石比范围;然后,分别测定了所配制的GPC-10及岩沥青改性沥青浇筑式混凝土GA-10的路用性能,并进行了对比评价及机理分析。结果表明:与GA-10相比,GPC-10高温性能提高39倍以上,低温性能提高5倍以上,抗疲劳性能提高7倍以上,冻融后剩余劈裂强度提高1倍以上,冻融循环不影响GPC-10的密水性,耐老化性能提高1倍以上。最后,通过铺筑试验路段对上述室内研究成果进行了工程验证。

Guss asphalt concrete is widely used in bridge deck paving for long bridges due to its outstanding deformation-following properties.However,the material has obvious shortcomings in high-temperature stability and energy saving and emission reduction.And polyurethane concrete has gradually become a hot spot of research due to its excellent road performance and environmental protection characteristics.In this paper,a polyether-based polyurethane developed by the group was used to formulate guss concrete GPC-10 instead of asphalt.Its performance was also evaluated in comparison with poured asphalt concrete.First,using polyether-based polyurethane as a binder,GPC-10 was formulated.The binder aggregate ratio was also determined based on their coating state and fluidity.Then,the road performance of the formulated GPC-10 and GA-10 were determined separately,A comparative evaluation was also conducted.The results show:compared to GA-10,GPC-10 has improved its high temperature performance by more than 39 times,low-temperature performance by more than 5 times,fatigue resistance by more than 7 times and the residual splitting strength after freezing and thawing is increased by more than a factor of one.Finally,the above indoor research results were verfied through the construction of experimental road sections.