摘要
多孔沥青混合料的粘聚粘附破坏主要发生在沥青砂浆位置,然而现阶段针对其内部沥青砂浆的粘附粘聚力的表征尚存空白。因此,以沥青粘结强度(BBS)试验为基础,设计可用于砂浆和胶浆的粘结强度(MBBS)试验,对基质沥青、SBS改性沥青和高黏改性沥青的多层次粘结强度和相应多孔沥青混合料在不同条件下的破坏形式进行研究。试验结果分析表明,MBBS试验可较好地表征不同改性沥青砂浆的粘结粘聚强度特征;多孔沥青混合料的劈裂强度和飞散损失指标与其砂浆/胶浆的粘结粘聚强度指标之间具有很强的相关性,使用MBBS试验表征得到的粘结粘聚强度与混合料的强度以及混合料在不同水损害条件下的耐久性有着较好的关联性。高温条件下多孔混合料的主要破坏形式是胶浆与沥青的粘结破坏;而在中低温条件下,多孔沥青混合料短期和长期浸水的破坏形式分别为砂浆的粘聚破坏和沥青-集料的粘结破坏。研究成果在砂浆/胶浆尺度的视角下深入分析多孔沥青混合料粘附粘聚破坏机理,为多孔沥青路面材料耐久性评价提供新思路。
The cohesive and adhesion damage of porous asphalt mixture(PAC)mainly occurs at the location of asphalt mortar.However,there is a gap in the characterization of adhesion-cohesion properties of asphalt mortar.Therefore,in this study,the asphalt binder bond strength(BBS)test was used as the basis to design a modified bond strength(MBBS)test that can be used for asphalt mortar and mastic.The bond strength between binder,mastic,mortar,and aggregate containing base binder,SBS modified binder and high viscosity modified asphalt binder was investigated through BBS and MBBS test.And the damage modes of the PAC mixtures under different testing conditions were studied.The testing results showed that the MBBS test can better characterize the bonding and cohesion strength of asphalt mortars containing different asphalt binders.There is a strong correlation between the splitting strength and cantabro loss of PAC mixtures and the bonding and cohesion strength of asphalt mastics and mortars.The bonding strength cohesion strength measured using MBBS test characterization has a good correlation with the strength of the mixture and the durability of the mixture under different water damage conditions.The main damage mode of PAC mixtures under high temperature conditions is the bonding damage of mastic and asphalt binder.While under low and medium temperature conditions,the damage of porous asphalt mixes under short-term and long-term water immersion is in the form of cohesive damage of mortar and bonding damage of asphalt-aggregate,respectively.The research results provide an in-depth analysis of the adhesion and cohesion damage mechanism of PAC mixtures from a mortar/mastic scale perspective,and provide new ideas for the durability evaluation of PAC mixtures.
作者
吴红波
褚跃
顾兴宇
汤俊卿
WU Hongbo;CHU Yue;GU Xingyu;TANG Junqing(Anhui Transportation Holding Group Co.,Ltd.,Hefei 230092,China;School of Transportation,Southeast University,Nanjing 211189,China)
出处
《建筑结构》
北大核心
2023年第S02期1390-1398,共9页
Building Structure
基金
国家自然科学基金(52278442)
国家自然科学基金(51878162)。
关键词
高黏改性沥青
多孔沥青混合料
粘聚强度
粘结强度
耐久性
high-viscosity asphalt(HVA)
porous asphalt concrete(PAC)
cohesive strength
bonding strength
durability
