Evaluation on Self-healing Mechanism and Hydrophobic Performance of Asphalt Modified by Siloxane and Polyurethane
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2019年第3期
论文作者：周新星 SUN Bin WU Shaopeng ZHANG Xiao LIU Quantao 肖月
文章页码：630 - 637
摘 要：In order to inhibit and remove the thin ice and extend the lifetime of the damaged bridge, the self-healing mechanism and hydrophobic performance of asphalt modified by siloxane and polyurethane（ASP） were studied by dynamic shear rheology（DSR）, fluorescence microscope（FM）, atomic force microscope（AFM）, the fracture-healing-re-fracture test and molecular simulations. The experimental results indicated that the selfhealing capability of ASP increased with increasing heating time and temperature. Furthermore, the addition of siloxane could improve the reaction energy barrier and complex modulus, and it is believed that the self-healing is a viscosity driven process, consisting of two parts namely crack closure and properties recovery. Contact angle of ASP increased with the increasing siloxane content and it deduced that the siloxane could improve the hydrophobic performance of ASP and the ASP molecule model could simulate well the self-healing mechanism and hydrophobic performance of ASP.
周新星1，SUN Bin2，WU Shaopeng3，ZHANG Xiao1，LIU Quantao3，肖月3
1. Key Laboratory of Highway Construction and Maintenance Technology in Loess Region of the Ministry of Transport,Shanxi Transportation Research Institute2. Key Laboratory of Road and Traffic Engineering of the Ministry of Education,Tongji University3. State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology
摘 要：In order to inhibit and remove the thin ice and extend the lifetime of the damaged bridge, the self-healing mechanism and hydrophobic performance of asphalt modified by siloxane and polyurethane（ASP） were studied by dynamic shear rheology（DSR）, fluorescence microscope（FM）, atomic force microscope（AFM）, the fracture-healing-re-fracture test and molecular simulations. The experimental results indicated that the selfhealing capability of ASP increased with increasing heating time and temperature. Furthermore, the addition of siloxane could improve the reaction energy barrier and complex modulus, and it is believed that the self-healing is a viscosity driven process, consisting of two parts namely crack closure and properties recovery. Contact angle of ASP increased with the increasing siloxane content and it deduced that the siloxane could improve the hydrophobic performance of ASP and the ASP molecule model could simulate well the self-healing mechanism and hydrophobic performance of ASP.
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