Journal article
Evaluation of mechanical performance and modification mechanism of asphalt modified with graphene oxide and warm mix additives
Journal of cleaner production, Vol.193, pp.87-96
08/20/2018
Handle:
https://hdl.handle.net/2376/120739
Abstract
A hot mix asphalt binder (HMAB), PG 64-22 with 0.05 wt.% graphene oxide (GO), was used to prepare warm mix asphalt binders (WMABs) with three types of warm mix additives, i.e, 3 wt.% Sasobit, 5 wt.% waste cooking oil (WCO), and Sasobit + WCO. The viscosity-temperature performance, rheological performance, low-temperature cracking behavior, Fourier Transform infrared spectroscopy (FTIR) spectrum, and low-temperature thermal properties of various HMABs and WMABs were investigated in the laboratory. The experimental results revealed that GO remarkably increased the viscosity, high-temperature elasticity and permanent deformation resistance of the non-modified PG 64-22 asphalt binder. When used individually or in combination, Sasobit and WCO can significantly decrease the viscosity of GO-modified asphalt, and reduce the suitable construction temperatures of asphalt paving. Modification of asphalt by the admixtures of GO and Sasobit results in excellent high-temperature properties but compromised the low-temperature performance of the asphalt, thus making it more suitable for hot-climate regions. On the other hand, modification of asphalt by the admixtures of GO and WCO exhibited the exact opposite trend, making it more suitable for cold-climate regions. The GO + Sasobit + WCO composite modified asphalt exhibited excellent properties both in high and low temperatures, implying its suitability for all climatic regions. The Differential Scanning Calorimetry (DSC) results suggested that WCO significantly decreased the Tg of the non-modified asphalt but Sasobit did not and both of them can enhance the crosslinking degree of asphalt. The FTIR results suggested that the modification of asphalt by the admixtures of GO and warm mix additive (Sasobit or WCO) entailed both chemical reaction and physical blending.
•Both 3 wt.% Sasobit and 5 wt.% WCO can significantly reduce the viscosity and construction temperature of asphalt mixture.•The selection of warm mixing additive is closely related to the service environment of asphalt mixture.•Sasobit and WCO can improve the crosslinking density of GO-modified asphalt, but have different impacts on its performance.•The modification mechanism of the GO and warm mix additive modified asphalt includes chemical reaction and physical blending.
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Details
- Title
- Evaluation of mechanical performance and modification mechanism of asphalt modified with graphene oxide and warm mix additives
- Creators
- Kefei Liu - School of Civil Engineering, Central South University of Forestry & Technology, Changsha 410004, Hunan, PR ChinaKun Zhang - Department of Civil and Environmental Engineering, Voiland College of Engineering and Architecture, Washington State University, P.O. Box 642714, Pullman, WA 99164, USAJunliang Wu - Department of Civil and Environmental Engineering, Voiland College of Engineering and Architecture, Washington State University, P.O. Box 642714, Pullman, WA 99164, USABalasingam Muhunthan - Department of Civil and Environmental Engineering, Voiland College of Engineering and Architecture, Washington State University, P.O. Box 642714, Pullman, WA 99164, USAXianming Shi - Department of Civil and Environmental Engineering, Voiland College of Engineering and Architecture, Washington State University, P.O. Box 642714, Pullman, WA 99164, USA
- Publication Details
- Journal of cleaner production, Vol.193, pp.87-96
- Academic Unit
- Civil and Environmental Engineering, Department of
- Publisher
- Elsevier Ltd
- Identifiers
- 99900612854901842
- Language
- English
- Resource Type
- Journal article