高胶改性ECA-10沥青混合料的试验研究及应用

Experimental Study and Application of High Viscosity Modified ECA-10 Asphalt Mixture

为解决SBS改性AC类薄层罩面高温抗车辙、抗滑性能不足的问题,通过增设6.7 mm筛孔和降低4.75 mm筛孔通过率来改良AC-10级配,形成了一种骨架密实型ECA-10级配,并采用新型高胶改性沥青来取代传统SBS改性沥青。通过软化点、60℃动力黏度、布氏旋转黏度及PG分级试验等高温性能指标,验证了高胶改性沥青比SBS改性沥青高温稳定性更出色;通过车辙、马歇尔稳定性、低温弯曲等室内试验,对比验证了高胶改性ECA-10沥青混合料与SBS改性ECA-10、AC-10和SMA-10混合料的路用性能表现,结果表明,ECA-10级配动稳定度高于SMA-10级配,采用高胶改性沥青后高温性能更加优异。在江苏高淳开展高胶改性ECA-10技术的实体工程,进行摩擦系数摆值、渗水系数、构造深度等现场检测,结果表明2.5 cm ECA-10高胶超薄磨耗层具备优异的抗滑、密水性能,具有较高的工程推广价值。

In order to solve the problem of insufficient anti-slip and anti-rutting properties of SBS modified AC thin layer overlays,the AC-10 gradation is improved by adding 6.7 mm sieve holes and reducing the pass rate of 4.75 mm sieve holes,a ECA-10 gradation of a dense skeleton is formed,and the traditional SBS modified asphalt is replaced by this new type of high viscosity modified asphalt.Through the high temperature performance indexes such as the softening point,60°C dynamic viscosity,brook field viscometer and PG classification test,it is verified that the high viscosity modified asphalt has better high-temperature stability than SBS modified asphalt.Through the indoor experiments such as the rutting,Marshall stability,low-temperature bending,the road performances of the high viscosity modified ECA-10 asphalt mixture and SBS modified ECA-10,AC-10 and SM-10 asphalt mixture were studied.The results showed that the dynamic stability of the ECA-10 gradation is higher than that of the SMA-10 gradation,and the high temperature performance of modified asphalt is even better.Finally,the entity project of ECA-10 high viscosity modification technology was carried out in Gaochun,Jiangsu province,and on-site monitoring of friction coefficient pendulum value,water permeability coefficient,and structural depth was carried out.The results show that 2.5 cm ECA-10 high viscosity ultra-thin wear layer has excellent high temperature resistance,water tightness performance,which is apt to promote in engineering.