废旧玻璃沥青混凝土路用性能和导热性能研究

Study on Road Performance and Thermal Conductivity of Waste Glass Asphalt Concrete

目的研究废旧玻璃集料替换天然集料,掺入沥青混凝土作为绿色路面的可能性,解决废旧玻璃难以回收利用的难题,并减少天然砂石的消耗、减轻环境的负担。方法采用合理的破碎工艺获取玻璃集料,运用喷砂工艺和硅烷偶联剂物化处理玻璃集料表面;选取多级嵌挤密实型级配,并进行玻璃沥青混合料路用性能研究;运用平板法测定废旧玻璃沥青混凝土的导热性能。结果经加工处理的玻璃集料具有良好的棱角性,增强了与沥青之间的黏附性;用粒径为2.36 mm和1.18 mm玻璃集料替代天然集料,玻璃集料在沥青混合料中能形成有效的嵌挤,在满足路用性能的前提之下可将玻璃集料的掺量提高到30%;沥青混合料中加入玻璃集料后,导热系数减小,升温速率变缓。结论废旧玻璃沥青混凝土不仅缓解了环境污染问题,且具有良好的路用性能和阻热性能。

The goal of this research was to study the possibility of replacing the mineral aggregates in the asphalt concrete with the waste glass aggregates as the green pavement material,to solve the problem of recycling waste glass,and to reduce the consumption of the mineral aggregates and the burden on the environment.A rational crushing process was used to obtain the glass aggregate.The sandblasting and the silane coupling agents were applied to treat the surface of the glass aggregates.A multilevel dense built-in gradation was selected,and the road performance of the glass asphalt mixture was studied.The plate method was used to determine the thermal conductivity of the waste glass asphalt concrete.The results show that the glass aggregates have good angularity and adhesion with bitumen.The glass aggregates with sizes of 2.36 and 1.18 mm can form an effective interlocking capability in the asphalt mixture.The maximum content of the glass aggregates is recommended to be 30%.The glass asphalt concrete has low thermal conductivity and heating rate.The waste glass asphalt mixture not only alleviates the environmental pollution problems but also has good road performance and thermal performance.