超韧超薄磨耗层沥青混合料设计与性能研究

Study on Design and Performance of Ultra-tough Ultra-thin Wear-resistant Layer Asphalt Mixture

摘要:

传统超薄磨耗层因施工速度快、造价较低且性能优异等，目前被广泛应用于高等级公路的预防性养护中。为了进一步提升超薄磨耗层的路用性能，利用特有的高黏高弹型改性沥青结合相关试验配合比设计，提出了一种超韧超薄磨耗层（UTFC-H）沥青混合料，并对该沥青混合料进行了相关宏观性能试验。结果表明：超韧超薄磨耗层沥青混合料的最佳油石比为7.5%，采用的高黏高弹型改性沥青基本指标远高于规范要求，与传统超薄磨耗层沥青混合料性能相比，超韧超薄磨耗层混合料的高温抗车辙性能、低温抗裂性能、水稳定性及黏结性能在满足规范要求的同时，具有更好的路用性能表现。

Abstract:

The traditional ultra-thin wear-resistant layer is widely used now in the preventive maintenance of high-grade highways due to its fast construction speed, low cost and excellent performance. In order to further improve the pavement performance of the ultra-thin wear-resistant layer, a UTFC-H ultra-tough ultra-thin wear-resistant layer asphalt mixture is proposed by using the unique high-viscosity and high-elasticity modified asphalt combined with the relevant test mix design, and the relevant macro-performance test of the asphalt mixture is carried out. The results show that the optimum asphalt-aggregate ratio of ultra-tough ultra-thin wear-resistant layer asphalt mixture is 7.5 %. The basic indexes of high-viscosity high-elasticity modified asphalt are much higher than the requirements of the specification. Compared with the performance of traditional ultra-thin wear-resistant layer asphalt mixture, the high-temperature rutting resistance, low-temperature crack resistance, water stability and bonding performance of ultra-tough ultra-thin wear-resistant layer asphalt mixture meet the requirements of the specification and have better pavement performance.