PR.M High Modulus Asphalt Mixture In Highway Application Research

In recent years, the expressway of our country obtained the rapid development, with the increase of traffic and overload phenomenon is serious, the traditional asphalt mixture performance indicators increasingly unable to meet the practical requirements.PR-Module as a model of asphalt mixture additives, in high temperature rutting, water stability and anti fatigue has a unique advantage, can prolong the service life of the asphalt pavement, and improve the asphalt pavement smoothness and riding comfort. This paper of high modulus asphalt mixture added PR.M for the ratio design and road performance of and provide a reference for the later high modulus asphalt mixture is widely used significance.With BISAR software of high modulus asphalt mixture of numerical analysis. Analysis showed that:in asphalt pavement structure model, independent of the state or the state of emergency braking of coefficients in horizontal, interlayer contact how, at a depth of 4 cm is control key position of permanent deformation, It is found that the reasonable layer of high modulus additive is in the middle and lower layers. Under the assumption of completely elastic state, reduce the modulus of asphalt layer structure shear stress becomes smaller, prone to shear failure; when the modulus increase. The maximum shear stress will increase, can effectively prevent the shear deformation, improve the service life of the asphalt pavement, and can reduce the The damage to the road surface.According to the mechanism of high modulus asphalt mixture and technical requirements of the coarse and fine aggregate, filler is put forward. Through indoor Marshall test to determine the PR.M best dry mixing time is 20s, the best mixing temperature to 175 DEG C, under the dosage of 0.5% the best oil of AC-20C and AC-25C stone ratio is 4.2% and 4.1%.High modulus asphalt mixture with different dosage of PR.M carried out road performance research, mechanics, high temperature performance, low temperature performance, water stability and the fatigue test. Studies have shown that with increase of PR.M dose, the dynamic stable degree increases, the relative deformation ratio is reduced; water stability, residual stability has improved significantly, but freeze thaw split little change in strength is higher than the ordinary asphalt mixture; low temperature performance and mechanical properties are improved significantly; under the minimum stress fatigue life up to increase 172%, the maximum stress force fatigue life under most growth 528%.Combined with the engineering example,Qian (jiang)——shi(shou) high-speed high modulus asphalt pavement test section. The test section paving results show:high modulus asphalt mixture not only to meet regulatory requirements and properties at elevated temperatures, water stability and mechanical is much better than that of the common asphalt mixture; test section paved, degree of compaction, permeability coefficient to meet the requirements; put forward the construction technology of high modulus asphalt mixture,for the future of high modulus asphalt mixture in our country to provide a reference for the promotion.