【目的】探究温拌沥青混合料黏附机理,拓展温拌沥青与集料黏附性研究方法。【方法】使用原子力显微镜(atomic force microscope,AFM)测得分别加入Sasobit类温拌剂H01(质量分数分别为1.0%、3.0%、5.0%)和表面活性剂类温拌剂H02(质量分数...【目的】探究温拌沥青混合料黏附机理,拓展温拌沥青与集料黏附性研究方法。【方法】使用原子力显微镜(atomic force microscope,AFM)测得分别加入Sasobit类温拌剂H01(质量分数分别为1.0%、3.0%、5.0%)和表面活性剂类温拌剂H02(质量分数分别为0.3%、0.5%、0.7%)的温拌沥青试样黏附力,并经JKR(Johnson-Kendall-Roberts)模型和表面能理论将其转换为沥青表面能,计算沥青-花岗岩和沥青-玄武岩体系的无水、有水黏附功,并与水煮试验、水稳定性试验结果进行对比分析;对基于AFM测得的温拌沥青退针力曲线进行积分,得到黏附性指标G,并将其与沥青表面能进行相关性拟合。【结果】两类温拌剂的加入均降低了温拌沥青-集料体系的黏附功,温拌沥青-花岗岩体系的无水黏附功比温拌沥青-玄武岩体系的大,有水黏附功则相反;基于AFM求解得到的H01温拌沥青-玄武岩体系黏附功的变化趋势与水稳定性试验结果相同,而H02温拌沥青-玄武岩体系的则相反;黏附性指标G与沥青表面能之间具有较好的相关性。【结论】相比温拌沥青-玄武岩体系,温拌沥青-花岗岩体系更容易发生水损害;基于AFM求解沥青-玄武岩体系黏附功的方法适用于Sasobit类温拌沥青,不适用于表面活性剂类温拌沥青;本文提出的黏附性指标G为评价温拌沥青-集料体系黏附性提供了新的量化指标。展开更多
Fine particle detachment and subsequent migration can lead to severe pore plugging and consequent permeability decline.Therefore,it is crucial to quantify the critical condition when fine particle detachment occurs.Th...Fine particle detachment and subsequent migration can lead to severe pore plugging and consequent permeability decline.Therefore,it is crucial to quantify the critical condition when fine particle detachment occurs.The frequently observed deviations or even contradictions between experimental results and theoretical predictions of fines detachment arise from an insufficient understanding of adhesion force that can be highly influenced by salinity and temperature.To clarify the intrinsic influence of salinity and temperature on fines detachment,adhesion forces between carboxyl microspheres and hydrophilic silica substrates in an aqueous medium were measured at various salinities and tempera-tures using atomic force microscopy(AFM).The AFM-measured adhesion force decreases with increasing salinity or temperature.Trends of mean measured adhesion forces with temperature and salinity were compared with the DLVO and XDLVO theories.DLVO theory captured the trend with temperature via the impact of temperature on electric double layer interactions,whereas XDLVO theory captured the observed trend with salinity via the impact of salinity on the repulsive hydration force.Our results highlight the significance of hydration force in accurately predicting the fate of fines in porous media.展开更多
文摘【目的】探究温拌沥青混合料黏附机理,拓展温拌沥青与集料黏附性研究方法。【方法】使用原子力显微镜(atomic force microscope,AFM)测得分别加入Sasobit类温拌剂H01(质量分数分别为1.0%、3.0%、5.0%)和表面活性剂类温拌剂H02(质量分数分别为0.3%、0.5%、0.7%)的温拌沥青试样黏附力,并经JKR(Johnson-Kendall-Roberts)模型和表面能理论将其转换为沥青表面能,计算沥青-花岗岩和沥青-玄武岩体系的无水、有水黏附功,并与水煮试验、水稳定性试验结果进行对比分析;对基于AFM测得的温拌沥青退针力曲线进行积分,得到黏附性指标G,并将其与沥青表面能进行相关性拟合。【结果】两类温拌剂的加入均降低了温拌沥青-集料体系的黏附功,温拌沥青-花岗岩体系的无水黏附功比温拌沥青-玄武岩体系的大,有水黏附功则相反;基于AFM求解得到的H01温拌沥青-玄武岩体系黏附功的变化趋势与水稳定性试验结果相同,而H02温拌沥青-玄武岩体系的则相反;黏附性指标G与沥青表面能之间具有较好的相关性。【结论】相比温拌沥青-玄武岩体系,温拌沥青-花岗岩体系更容易发生水损害;基于AFM求解沥青-玄武岩体系黏附功的方法适用于Sasobit类温拌沥青,不适用于表面活性剂类温拌沥青;本文提出的黏附性指标G为评价温拌沥青-集料体系黏附性提供了新的量化指标。
基金supports from the National Natural Science Foundation of China(Grant No.52474059,Grant No.52174046)are greatly acknowledged.
文摘Fine particle detachment and subsequent migration can lead to severe pore plugging and consequent permeability decline.Therefore,it is crucial to quantify the critical condition when fine particle detachment occurs.The frequently observed deviations or even contradictions between experimental results and theoretical predictions of fines detachment arise from an insufficient understanding of adhesion force that can be highly influenced by salinity and temperature.To clarify the intrinsic influence of salinity and temperature on fines detachment,adhesion forces between carboxyl microspheres and hydrophilic silica substrates in an aqueous medium were measured at various salinities and tempera-tures using atomic force microscopy(AFM).The AFM-measured adhesion force decreases with increasing salinity or temperature.Trends of mean measured adhesion forces with temperature and salinity were compared with the DLVO and XDLVO theories.DLVO theory captured the trend with temperature via the impact of temperature on electric double layer interactions,whereas XDLVO theory captured the observed trend with salinity via the impact of salinity on the repulsive hydration force.Our results highlight the significance of hydration force in accurately predicting the fate of fines in porous media.
