石灰岩沥青混合料抗滑性能衰变特性研究

为了了解石灰岩沥青混合料抗滑性能衰变特性的影响因素,使用自行开发的室内加速磨耗模拟装置,针对AC-13及SMA-13混合料,研究了混合料类型和集料特性等因素对混合料抗滑衰变特性的影响。试验结果表明,随着磨耗圈数的增加,AC-13混合料的摆值持续降低,SMA-13混合料则先升后降;增大级配中粒径大于2.36mm集料的含量,有利于改善AC-13及SMA-13混合料的抗滑衰变特性,AC-13混合料的抗滑衰变特性与贝雷法级配参数之间有着良好的线性关系;集料的磨光值、洛杉矶磨耗损失和压碎值对两种混合料的抗滑衰变特性均有显著影响,且影响程度依次降低;粗集料针片状含量与混合料的抗滑衰变特性之间为明显的负相关关系,当集料粒形接近球体或立方体时混合料的抗滑衰减速率减缓。

Study on the Anti-sliding Deterioration of Limestone Asphalt Mixture

In order to know the influence factors of anti-sliding deterioration of the limestone asphalt mixture, the effect of changing the mixture type and the characteristics of coarse aggregates on the anti-sliding deterioration of the AC-13 and SMA-13 mixture were studied by using a self-developed accelerated wearing simulation device. The results showed:as the wearing rates increased, the swing value of the AC-13 mixture decreased sustainedly while the SMA-13 mixture rose first then fall. Increasing the content of the aggregate bigger than 2.36 mm in gradation helped improving the anti-sliding deterioration of the AC-13 and SMA-13 mixture. The anti-sliding deterioration of the AC-13 had a good linear relationship with its Bailey method gradation parameters. The Losangeles abrasion value,polished value and crushing value of the aggregate all had significant effect on the anti-sliding deterioration of AC-13 and SMA-13 mixture. The influence degree decreased in turn. The content of needle particle and slice particle had a significantly negative correlation with the anti-sliding deterioration of the mixture. When the sizes of aggregate were close to the sphere or cube, the rate of anti-sliding deterioration was slower.