Abstract
There is significant evidence that utilizing polymers improves asphalt cement characteristics, preserve the environment, and increases industrial-economic benefits. Consequently, the use of such modifier in asphalt cements via sustainable technology is strongly encouraged. The major goal of this research is to study the effect of modified asphalt cement with crumb rubber (CR) (10%, 15%, and 20% CR) and recycled polyethylene terephthalate (rPET) (1.5%, and 2.5% rPET) on the physical and rheological characteristics of asphalt cements. Asphalt cement experiments such as softening point, penetration, and rotational viscosity (RV), were performed on both the virgin and modified asphalt cements. The effect of CR and rPET on the temperature sensitivity of the asphalt cement was also evaluated by checking the penetration index (PI), penetration viscosity number (PVN), viscosity-temperature sensitivity (VTS), activation energy flow methods (AE) of all the modified asphalt cements. The rutting index (G*/sin δ) was calculated using Bari and Witczak model. The findings revealed that the addition of CR and rPET in the asphalt cement reduced the temperature sensitivity and enhanced the rheological characteristics of the asphalt cements. Moreover, incorporating the CR and rPET into virgin asphalt cements increased the high temperature performance of all percentage of CR and 2.5% WP modified asphalt. There was a considerable correlation between temperature sensitivity methods; PI, PVN, VTS, and AE. Finally, virgin asphalt modified with CR is better than rPET.
Highlights
Asphalt cements are viscoelastic materials, which are a tough elastic at temperatures that are low and a viscous liquid at high temperatures
The asphalt cement modified with crumb rubber (CR) and waste plastic cups (WP) increased the softening point while penetration was reduced
The rotational viscosity of the modified asphalt cement was improved with increasing the additive content and was still less than 3000 cP at 135 °C according to Superpave requirements
Summary
Asphalt cements are viscoelastic materials, which are a tough elastic at temperatures that are low and a viscous liquid at high temperatures. Pavement performance is intimately related to the viscoelastic characteristics of asphalt cements and is gradually deteriorated when there is a heavy traffic volume and high-temperatures. The loading period and temperature have a negative effect on the properties of asphalt cements [1, 2]. The behavior of asphalt pavements exhibits extreme sensitivity to temperature, including permanent high temperature deformation, service temperature fatigue, and thermal cracking due to low temperature [3, 4]. Temperature sensitivity is a significant factor in terms of rheological characteristics of asphalt cements. The term "temperature susceptibility" refers to a variation in the consistency of the asphalt cement s as a function of temperature. Asphalt cements that have been modified to enhance the characteristics and function of the asphalt mixture is a viable approach to overcome the
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
