Silane Modification of Crumb Rubber on the Rheological Properties of Rubberized Asphalt

Because there is a lack of studies on rubberized asphalt based on silane coupling agent modification, KH-550 modified crumb rubber and rubberized asphalts incorporating normal rubber and modified rubber were prepared, respectively. The rheological properties of asphalt samples were evaluated by a dy...

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Bibliographic Details
Published inApplied sciences Vol. 9; no. 22; p. 4831
Main Authors Zhang, Yunbao, Liu, Zhaohui, Peng, Juan
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.11.2019
Subjects
Asphalt
Asphalt pavements
Chemical reactions
Coupling agents
crumb rubber
Fourier transforms
Functional groups
High temperature
Infrared spectroscopy
kh-550
Low temperature
mechanical
Mechanical properties
rheological
Rheological properties
Rheology
Rubber
rubberized asphalt
Shearing
Silanes
Surface area
Trends
Viscoelasticity
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Summary:Because there is a lack of studies on rubberized asphalt based on silane coupling agent modification, KH-550 modified crumb rubber and rubberized asphalts incorporating normal rubber and modified rubber were prepared, respectively. The rheological properties of asphalt samples were evaluated by a dynamic shearing rheometer and a bending beam rheometer; then, mechanisms of KH-550 on rubber surface and functional group changes were analyzed by a Brunauer–Emmett–Teller specific surface area measurement and a Fourier transform infrared spectroscopy. The results imply that: (i) rubber surface area rises and chemical reactions accrue between rubber and asphalt; (ii) modified rubber achieves a more stable state within asphalt, which helps to enhance the mechanical properties of asphalt; (iii) modified rubber helps asphalt to dissipate stress so as to resist the formation of cracks and deformation under low temperature conditions.
ISSN:2076-3417
2076-3417
DOI:10.3390/app9224831