天然砂砾石骨料心墙沥青混凝土耐久性试验研究  

Experiment on durability of core wall asphalt concrete with natural gravel aggregate

作　　者：董芸[1,2] 熊泽斌 王晓军 闫小虎[1,2] DONG Yun;XIONG Zebing;WANG Xiaojun;YAN Xiaohu(Institute of Material and Structure,Changjiang River Scientific Research Institute,Wuhan 430010,China;National Research Center on Dam Safety Engineering,Wuhan 430010,China;CISPDR,Co.,Ltd.,Wuhan 430010,China)

机构地区：[1]长江科学院材料与结构研究所,湖北武汉430010 [2]国家大坝安全工程技术研究中心,湖北武汉430010 [3]长江设计集团有限公司,湖北武汉430010

出　　处：《人民长江》2023年第4期218-223,共6页Yangtze River

摘　　要：天然砂砾石多为酸性岩石,通过添加水泥、抗剥落剂等可使应用天然砂砾石骨料的心墙沥青混凝土水稳定性合格,然而目前针对天然砂砾石骨料沥青混凝土长期耐久性的研究相对较少,使工程上应用天然砂砾石骨料仍多有疑虑。通过分析在高温水浸泡及冻融循环条件下天然砂砾石沥青混凝土力学变形性能的变化规律,探讨了使用天然砂砾石骨料的心墙沥青混凝土长期耐久性。试验结果表明:掺加抗剥落剂的天然砂砾石骨料沥青混凝土的长期水稳定性能与灰岩骨料沥青混凝土相当,且具有良好的抗冻融特性;孔隙率对天然砂砾石骨料沥青混凝土的小梁弯曲强度及其冻融损伤变量、最大弯拉应变、最大压缩应变等指标均有较大影响;提高沥青混凝土的压实度,减小孔隙率,对于保证心墙沥青混凝土的弯曲强度和变形性能具有重要意义。Natural gravel is mainly acidic rock.Adding cement,anti-stripping agent and other measures can make the water stability of core wall asphalt concrete with gravel aggregate qualified.However,there were relatively few studies on the long-term durability of core wall asphalt concrete with natural gravel aggregate,so the application of natural gravel aggregate in engineering is still doubtful.In this paper,the evolution law of mechanical and deformation performance of asphalt concrete with gravel aggregate under long-term immersion in high temperature water and after freeze-thaw cycles was systematically analyzed.And the durability of asphalt concrete with gravel aggregate for core wall was further investigated.The results showed that the long-term water stability of asphalt concrete with gravel aggregate and anti-stripping agent is similar to that of asphalt concrete with limestone aggregate,which also possesses excellent freeze-thaw resistance.In addition,the porosity of asphalt concrete has great influence on the bending strength and its freeze-thaw damage variables,maximum flexural strain and maximum compressive strain.Therefore,it is of great significance to improve the compacting degree and decrease the porosity of the asphalt concrete in the core wall to ensure the bending strength and deformation performance of the asphalt concrete for core wall.

关 键 词：酸性骨料 沥青混凝土 长期水稳定性 冻融 抗剥落剂 损伤变量 

分 类 号：TV431[水利工程—水工结构工程]