SMA沥青混合料抗冲刷性能评价  

Evaluation of Anti-erosion Performance of SMA Mixtures

作　　者：周志刚[1] 李帅帅[1] 刘旭光[1] 俞文生[1,2] 杨志峰[1,2] 

机构地区：[1]长沙理工大学道路结构与材料交通行业重点实验室,湖南长沙410004 [2]江西省高速公路投资集团有限责任公司,江西南昌330000

出　　处：《中国公路学报》2016年第4期1-7,共7页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(51378084);江西交通科技计划项目(2011C0063);广西壮族自治区交通科技计划项目(桂交科教发[2013]100号)

摘　　要：为了研究动水冲刷作用对沥青混合料性能的影响,利用自研的动水冲刷装置,针对不同空隙率的SMA-13沥青混合料进行动水冲刷试验,比较动水冲刷前后试件渗水系数、抗压强度、劈裂强度和质量等参数的变化;参照《公路沥青路面施工技术规范》中沥青混合料水稳定性评价标准,提出了基于动水冲刷前后抗压强度比和劈裂强度比的沥青混合料抗冲刷评价指标及标准建议值。研究结果表明:动水冲刷作用对沥青混合料性能有不利影响,空隙率不同,影响程度不同;抗压强度和劈裂强度均随空隙率增大而减小,空隙率8%左右的沥青混合料受动水冲刷后其衰减程度最大;动水冲刷后,渗水系数略有增大,质量损失随空隙率的增大而增加,但增加速率逐渐放缓。In order to investigate the influence of dynamic water erosion on the performance of asphalt mixtures,the tests of dynamic water erosion on SMA-13 mixture samples with different porosities by using a self-developed dynamic water erosion test device were taken,and the changes of parameters such as permeability coefficients,compressive strength,indirect tension strength and mass were compared before and after dynamic water erosion.By reference to the standard of water stability evaluation on asphalt mixtures in the Technical Specifications for Construction of Highway Asphalt Pavement,the evaluation indexes and their standard values of anti-erosion performance of asphalt mixtures were suggested based on the ratio of compressive strength and indirect tension strength before and after dynamic water erosion.The results show that the dynamic water erosion shows negative effect on the performance of asphalt mixtures,and the effect varies with different porosities,the compressive strength and indirect tension strength decrease with the increase of porosity.For the SMA-13 mixtures with around 8% porosity,the influence of dynamic water erosion on its degree of attenuation is the greatest.The mixture＇s permeability coefficients increase slightly after it is eroded by dynamic water.Moreover,with theincrease of porosity,the mass loss increases with a gradually slower growth rate.

关 键 词：道路工程 沥青玛蹄脂碎石混合料 动水冲刷试验 空隙率 抗压强度 劈裂强度 

分 类 号：U416.1[交通运输工程—道路与铁道工程]