Research On Performance Of Polyurethane Porous Elastic Pavement Mixture

Highway traffic noise pollution is becoming an increasingly important factor endangers the health of the residents living along the road and passengers in vehicles. When the vehicle speed in 30Km/h or more, the tire/road noise becomes a major source of traffic noise. After years of study, Europe and Japan found that poro-elastic road surfaces (PERS) is the most effective pavement reducing tire/road noise in low noise pavements at present. This paper focuses on mixture design, road performances, skid resistance, adhesion to the base course of PERS, and provides references for the PERS study in China.Firstly, according to the characteristics of highway engineering, one-component moisture curing polyether polyurethane(Pu) adhesive is determined as the binder of poro-elastic mixture. Meanwhile, three key factors of the PERS mixture design are identified, which are thickness of the Pu film, porosity, the rubber particles content. PERS mixture gradation design refers to the OGFC mineral aggregate gradation, and asphalt film thickness calculation method of OGFC mixture can be used to calculate the thickness of polyurethane film.Secondly, the PERS mixture pavement performance were studied, including vibration reduction performance, rutting resistance, water stability and anti-stripping properties, low temperature bending performance. It is shown that PERS mixture has good rutting resistance. With the increase of rubber granules content, PERS mixture dynamic modulus decreases and phase angle increases, vibration reduction performance is more outstanding. With Pu film thickness increases, water stability, anti-stripping performance and flexural strength are improved. With porosity increases, water stability, anti-stripping performance and flexural strength decrease. Increasing the rubber particles content, water stability and flexural strength deteriorate, anti-spalling performance is improved.Finally, PERS skid resistance and adhesion to the base course were studied, and the finite element was used to calculate the shear between PERS and base course under car load. The results show that when the amount of sand spreading 4g/300cm2 or more, can significantly improve the skid resistance of PERS. Without processing interlayer, oblique shear test results show that with Pu film thickness of the PERS mixture increased, interlayer shear strength increased. Pu adhesive strength with asphalt pavement is lower than adhesion with cement pavement. Meanwhile, using epoxy asphalt, Pu adhesive and Pu fine sand mixture processing interface between PERS and base course can improve the interface shear strength.