| In the process of production and construction,traditional pavement materials such as asphalt mixture and cement concrete have high energy consumption and dust emission,which have a great impact on the environment.Besides,pavement material performance is susceptible to environmental impact,and its durability and service life are insufficient.Based on the research of shape memory epoxy resin,according to the pavement service temperature,this paper proposes a high elastic epoxy resin pavement binder with a suitable glass transition temperature(Tg).The binder has good flexibility and good deformation recovery ability and is able to carry out under normal temperature.The performance of binders and mixtures is studied experimentally to enrich pavement materials and promote the development of pavement technology.Based on the requirements of pavement materials,hydrogenated bisphenol A epoxy resin,toughening agent A and low molecular polyamide 650 were selected as raw materials to prepare high elastic epoxy resin pavement binder with different Tg.The relation between Tg and toughening agent A mass ratio was established.The curing characteristics of the binder indicated that the binder can be cured completely at room temperature,and the curing time of 25℃ is 26 h.The cured binder has good heat resistance.According to the tests of tensile,compression and bending deformation recovery,the binder has high direct tensile strength and compressive strength,and the elongation at tensile fracture can reach 200%.The effect of toughening agent A is very significant,and the fracture toughness of the binder cured at room temperature is better;when the temperature is higher than 5℃,the binder can quickly return to its initial shape and be in a high elastic state.According to the test and analysis of the strength formation of the high elastic epoxy resin pavement mixture,the early strength formation of the mixture is slow within 3 hours of curing,and 3 hours can be used as effective construction control time.After curing at 25℃ for 24 hours,the traffic can be opened.Under the curing condition of 25℃,the compressive strength and flexural tensile strength of the mixture are similar with the growth trend of the age.The high temperature can promote the strength formation of the mixture in a short time,but the normal temperature is conducive to the further growth of the strength in the later period.The rubber-stone ratio has a significant influence on the strength of the mixture after 30 days,and the strength of the mixture after 30 days reaches more than 90% of the final strength.Therefore,30 days can be used as the standard curing period of the test specimens for the strength performance.The bending strain of the mixture increases with the increase of the rubber-stone ratio and decreases with the increase of the age,showing good deformation resistance.Based on the test results,the prediction model of compressive strength,flexural strength and flexural strain of HEER-10 pavement mixture was established within 60 days of curing at 25℃.According to the deformation recovery capacity of the high elastic epoxy resin pavement mixture,the deformation recovery rate of the mixture in a short time(200s)after the load is removed is more than 90%,which is obviously higher than that of the asphalt mixture and has good deformation recovery capacity.The loading mode has a significant influence on the deformation recovery process.Increasing the rubber-stone ratio is conducive to improving the final deformation recovery of the mixture,but the curing age has no significant influence.Road performance test results show that the mixture has good high temperature stability,low temperature crack resistance and water stability.The maximum bending strain at-10℃ was up to 5805με. |
PDF Full Text Request