摘要
Abstract
[Purposes]To address the issues associated with asphalt pavement construction,such as significant susceptibility to natural factors,environmental pollution,and prolonged construction periods,a low-carbon,environmentally friendly,and quality-controllable curable epoxy resin mixture(CERM)was developed.[Methods]The ratio of epoxy resin and toughening agent was controlled through the deformation index of the tensile test,and the dosage of the diluent was determined according to the construction workability requirements of the viscosity test.According to the existing research,the ratio of each component in the epoxy resin was determined.Based on the gradation of the ultra-thin wearing course,the deformation requirements of the mixture were controlled through the ultimate strain of the bending test of small beam.Based on the strength requirements of the mixture through the splitting strength of the splitting test,the optimal dosage of the epoxy resin binder in CERM was determined.The rutting test,freeze-thaw splitting test,and sand patch method were adopted to verify whether the key performance of CERM meets the needs of highway engineering.During the test,the mixture ratio and forming conditions were controlled to ensure the comparability of the results.[Findings]Orthogonal tests determine the optimal formulation of CERM as follows:a toughening agent/epoxy resin mass ratio of 4:1.The optimal dosage of the diluent is 14％(by mass fraction),and that of the epoxy resin binder is 15％(measured by the mass of the rubber cement).Under these conditions,CERM exhibits a flexural deflection of 4.9 mm.In terms of high-temperature deformation resistance,the dynamic stability of CERM reaches 12 458 times/mm;when the mass fraction of the epoxy resin binder is 12％-15％,the fluctuation range of CERM's dynamic stability is greater than 18％,meeting the heavy-load traffic requirements in high-temperature areas.In terms of water stability,the splitting residual rate of CERM is 89.69％,and when the mass fraction of the epoxy resin binder is 15％,the splitting strength of CERM reaches 2.75 MPa.In terms of skid resistance and durability,the value of texture depth(TD)is ETD=0.62 mm,which meets the requirement in the Technical Specification for Construction of Highway Asphalt Pavements(JTG F40-2004)(subsequently referred to as the Specification)that ETD≥0.55 mm.The value of British pendulum number(BPN)is EBPN=0.56,which also meets the requirement in the Specification that EBPN≥0.45.Although the filling of epoxy resin results in a lower ETD for CERM compared to the one for the OGFC-7 type asphalt mixture(0.92 mm),the balance between skid resistance performance and durability can still be achieved by optimizing the aggregate gradation.[Conclusions]The CERM meets the requirements of strength,stability,and skid resistance performance specified in the Specification and can provide a foundation for the factory production and on-site construction of prefabricated flexible pavement.关键词
可卷曲/环氧树脂混凝土/弯曲性能/路用性能/高温性能Key words
curable/epoxy resin concrete/bending property/pavement performance/high-temperature performance分类
交通运输
