In this paper,the surface activated crumb rubber with waste cooking oil(WCO)was studied to improve the performance of crumb rubber modified asphalt.The activated waste crumb rubber modified asphalt(OCRMA)with differen...In this paper,the surface activated crumb rubber with waste cooking oil(WCO)was studied to improve the performance of crumb rubber modified asphalt.The activated waste crumb rubber modified asphalt(OCRMA)with different amount of crumb rubber was prepared to study the microscopic appearance of OCRMA by scanning electron microscope and fluorescence microscope and analyze the surface performance.The rheological properties and microscopic mechanism of OCRMA were characterized by dynamic shear rheological test,multiple stress creep recovery(MSCR)test,BBR test and infrared spectroscopy.The results show that the dissolution degree of waste crumb rubber is improved after WCO activation,and the compatibility with asphalt components is enhanced,and the stable cross-linking structure is formed,which improves the asphalt performance.The several new absorption peaks,which were obvious,were all caused by the composition of WCO,that is,there was no significant chemical change during the interaction between the activated crumb rubber and base asphalt.Compared with the common waste crumb rubber modified asphalt(CRMA),activation with WCO can significantly reduce the viscosity of CRMA,decrease the difference of segregation softening point by 27%,and enhance the low temperature performance by 30%.The aging degree is greatly reduced,and the anti-aging performance of OCRMA is increased by about 20%with the same dosage.The high temperature performance,though higher than that of base asphalt,decreases to some extent.After comprehensive analysis,the optimal dosage of crumb rubber for OCRMA is 30%.展开更多
The application of waste crumb rubber to modified asphalt can not only improve pavement performance,but also make full use of renewable resources,which is of great significance to environmental protection.However,the ...The application of waste crumb rubber to modified asphalt can not only improve pavement performance,but also make full use of renewable resources,which is of great significance to environmental protection.However,the waste crumb rubber modified asphalt has some disadvantages such as poor storage stability,high viscosity and high construction temperature requirement,which restricts the application of crumb rubber modified asphalt in road engineering.In order to improve the storage stability and construction workability of waste crumb rubber modified asphalt,in this paper hydrogen peroxide is adopted for the surface oxidation treatment of waste crumb rubber,to prepare five kinds of hydrogen peroxide treated waste crumb rubber modified asphalt with waste crumb rubber dosage of15%,20%,25%,30%,and 35%(wt%).The pavement performance was studied by conventional performance tests and rheological properties tests.Then,the microscopic mechanism was studied by scanning electron microscopy,infrared spectroscopy and thermogravimetric analysis.The results show that the waste crumb rubber becomes fluffy and has a richer pore structure on the surface after hydrogen peroxide treatment,which makes it easier for the light components in the asphalt to penetrate into the waste crumb rubber,and thus promotes its dissolution in asphalt,thereby improving the storage stability,construction workability,and low temperature performance of waste crumb rubber modified asphalt,but reduces the high temperature and elastic properties.At the same time,the surface polarity of activated waste crumb rubber is enhanced,and esterification reaction occurs with carboxyl groups,sulfoxides and acid anhydrides in asphalt,which effectively increases the interface bonding between asphalt and the waste crumb rubber,and further improves the storage stability,construction workability and low temperature performance of the waste crumb rubber modified asphalt.The optimum dosage of waste crumb rubber modified asphalt treated with hydrogen peroxide is 30%.展开更多
基金This study was supported by Hunan Provincial Natural Science Foundation(Project No.2021JJ30709)Changsha Municipal Natural Science Foundation(Project No.kq2007029)Practice Innovation and Entrepreneurship Enhancement Program for Postgraduate of Changsha University of Science&Technology(Project No.SJCX202112).
文摘In this paper,the surface activated crumb rubber with waste cooking oil(WCO)was studied to improve the performance of crumb rubber modified asphalt.The activated waste crumb rubber modified asphalt(OCRMA)with different amount of crumb rubber was prepared to study the microscopic appearance of OCRMA by scanning electron microscope and fluorescence microscope and analyze the surface performance.The rheological properties and microscopic mechanism of OCRMA were characterized by dynamic shear rheological test,multiple stress creep recovery(MSCR)test,BBR test and infrared spectroscopy.The results show that the dissolution degree of waste crumb rubber is improved after WCO activation,and the compatibility with asphalt components is enhanced,and the stable cross-linking structure is formed,which improves the asphalt performance.The several new absorption peaks,which were obvious,were all caused by the composition of WCO,that is,there was no significant chemical change during the interaction between the activated crumb rubber and base asphalt.Compared with the common waste crumb rubber modified asphalt(CRMA),activation with WCO can significantly reduce the viscosity of CRMA,decrease the difference of segregation softening point by 27%,and enhance the low temperature performance by 30%.The aging degree is greatly reduced,and the anti-aging performance of OCRMA is increased by about 20%with the same dosage.The high temperature performance,though higher than that of base asphalt,decreases to some extent.After comprehensive analysis,the optimal dosage of crumb rubber for OCRMA is 30%.
基金supported by Hunan Provincial Natural Science Foundation(Grant No.2021JJ30709)Henan Provincial Transportation Association Research Project(Grant No.YJXHZD202401)+1 种基金Changsha Municipal Natural Science Foundation,project No.kq2007029Research Innovation Project for Post-graduate of Changsha University of Science&Technology,project No.CX2021SS05。
文摘The application of waste crumb rubber to modified asphalt can not only improve pavement performance,but also make full use of renewable resources,which is of great significance to environmental protection.However,the waste crumb rubber modified asphalt has some disadvantages such as poor storage stability,high viscosity and high construction temperature requirement,which restricts the application of crumb rubber modified asphalt in road engineering.In order to improve the storage stability and construction workability of waste crumb rubber modified asphalt,in this paper hydrogen peroxide is adopted for the surface oxidation treatment of waste crumb rubber,to prepare five kinds of hydrogen peroxide treated waste crumb rubber modified asphalt with waste crumb rubber dosage of15%,20%,25%,30%,and 35%(wt%).The pavement performance was studied by conventional performance tests and rheological properties tests.Then,the microscopic mechanism was studied by scanning electron microscopy,infrared spectroscopy and thermogravimetric analysis.The results show that the waste crumb rubber becomes fluffy and has a richer pore structure on the surface after hydrogen peroxide treatment,which makes it easier for the light components in the asphalt to penetrate into the waste crumb rubber,and thus promotes its dissolution in asphalt,thereby improving the storage stability,construction workability,and low temperature performance of waste crumb rubber modified asphalt,but reduces the high temperature and elastic properties.At the same time,the surface polarity of activated waste crumb rubber is enhanced,and esterification reaction occurs with carboxyl groups,sulfoxides and acid anhydrides in asphalt,which effectively increases the interface bonding between asphalt and the waste crumb rubber,and further improves the storage stability,construction workability and low temperature performance of the waste crumb rubber modified asphalt.The optimum dosage of waste crumb rubber modified asphalt treated with hydrogen peroxide is 30%.
