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A platform for research: civil engineering, architecture and urbanism
Performance of modified asphalt of rubber powder through tetraethyl orthosilicate (TEOS)
Highlights RPMA was prepared with waste rubber modified by TEOS. Performance of modified asphalt of rubber powder through TEOS was studied. Effects of TEOS on storage stability of RPMA were investigated. Physical and rheological properties of RPMA with TEOS are evidently improved. Reasonable dosage of TEOS in RPMA was recommended.
Abstract “Black pollution” waste rubber tire powder is added to original asphalt to prepare rubber powder modified asphalt, which can not only solve the pressure of waste rubber tire on environment, but also improve the performance of asphalt pavement. However, the poor compatibility between rubber powder and original asphalt can weak the improvement effect of rubber powder on asphalt due to the strong network structure of rubber particles. Therefore, tetraethyl orthosilicate (TEOS) was introduced to pre-modify waste rubber powders in this work. And then the rubber powder modified asphalt (RPMA) was prepared and its physical properties, rheological properties and microstructures were investigated and characterized. Storage stability test, Fourier transform infrared spectroscopy working in mode of attenuated total reflectance (FTIR-ATR) and environmental scanning electron microscope (ESEM) were used to analyze effects of TEOS on storage stability of rubber powder. Influences of TEOS on physical properties of rubber asphalt were analyzed by softening point, penetration and ductility at 5 °C and combined with nuclear magnetic resonance (NMR) of 29Si. Finally, rheological property test and gel permeation chromatography (GPC) were used to analyze the mechanism of TEOS on rubber asphalt. The results show that the physical and rheological properties of RPMA are evidently improved. However, excessive TEOS can reduce the physical and rheological properties of RPMA. In addition, the proportion of macromolecule and micro molecule of RPMA first decreased and then increased with the increase of TEOS dosage. However, the molecular weight of RPMA increases. The network structure of Si-O-Si is intertwined with the network structure of rubber powder itself. Finally, the reasonable dosage of TEOS in RPMA can be determined through comparing properties of RPMA with different TEOS dosage.
Performance of modified asphalt of rubber powder through tetraethyl orthosilicate (TEOS)
Highlights RPMA was prepared with waste rubber modified by TEOS. Performance of modified asphalt of rubber powder through TEOS was studied. Effects of TEOS on storage stability of RPMA were investigated. Physical and rheological properties of RPMA with TEOS are evidently improved. Reasonable dosage of TEOS in RPMA was recommended.
Abstract “Black pollution” waste rubber tire powder is added to original asphalt to prepare rubber powder modified asphalt, which can not only solve the pressure of waste rubber tire on environment, but also improve the performance of asphalt pavement. However, the poor compatibility between rubber powder and original asphalt can weak the improvement effect of rubber powder on asphalt due to the strong network structure of rubber particles. Therefore, tetraethyl orthosilicate (TEOS) was introduced to pre-modify waste rubber powders in this work. And then the rubber powder modified asphalt (RPMA) was prepared and its physical properties, rheological properties and microstructures were investigated and characterized. Storage stability test, Fourier transform infrared spectroscopy working in mode of attenuated total reflectance (FTIR-ATR) and environmental scanning electron microscope (ESEM) were used to analyze effects of TEOS on storage stability of rubber powder. Influences of TEOS on physical properties of rubber asphalt were analyzed by softening point, penetration and ductility at 5 °C and combined with nuclear magnetic resonance (NMR) of 29Si. Finally, rheological property test and gel permeation chromatography (GPC) were used to analyze the mechanism of TEOS on rubber asphalt. The results show that the physical and rheological properties of RPMA are evidently improved. However, excessive TEOS can reduce the physical and rheological properties of RPMA. In addition, the proportion of macromolecule and micro molecule of RPMA first decreased and then increased with the increase of TEOS dosage. However, the molecular weight of RPMA increases. The network structure of Si-O-Si is intertwined with the network structure of rubber powder itself. Finally, the reasonable dosage of TEOS in RPMA can be determined through comparing properties of RPMA with different TEOS dosage.
Performance of modified asphalt of rubber powder through tetraethyl orthosilicate (TEOS)
Wang, Zhenjun (author) / Xu, Xu (author) / Wang, Xiaofeng (author) / Jinyang, Huo (author) / Guo, Haoyan (author) / Yang, Bo (author)
2020-09-16
Article (Journal)
Electronic Resource
English
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