Characterization of neat and modified asphalt binders and mixtures in relation to permanent deformation

Abstract

The addition of polymers on asphalt binders aims to enhance their performance, especially at high temperatures, which correspond to rutting resistance. The Superpave rutting parameter (|G*|/sinδ) has been considered to be inadequate to characterize the performance of modified materials, therefore the Multiple Stress Creep and Recovery (MSCR) test was developed, providing the parameter non-recoverable compliance (Jnr). This research has the main objective of correlating asphalt binders performance-based characterization with rutting resistance of asphalt mixtures, and presents results obtained for one conventional (50/70 penetration grade) and two modified asphalt binders (2.1% RET and 1.9% RET) regarding their rheological characteristics. With the use of the dynamic shear rheometer (DSR), master curves and MSCR results were obtained for the three binders. In addition, permanent deformation tests were performed on the asphalt mixtures by means of laboratory traffic simulation. The rutting characterization indicated higher permanent deformation resistance for the modified binders for the asphalt binder and the asphalt mixture testing. The main conclusions were that the use of modified binder reduced in approximately 50% the Jnr values and the rut depth; also, the asphalt binders’ characteristics were able to predict the asphalt mixtures rutting resistance.

Investigation of Rutting and Low Temperature Cracking Behavior of Reactive Ethylene Terpolymer and Waste Cooking Oil Modified Bitumen

“…value than Base. When the results of the R% values are compared with the results in the literature, it is seen that the addition of RET increases the R% [26,52,56] of the base bitumen, and the addition of WCO decreases [55]. Therefore, the results obtained from this study are in line with the studies in the literature.…”

“…If the effect of temperature on is Figure 3, it seen that Jnr values increase with increasing temperature, and as expected, the rutting resistance of bitumen decreases. This change in Jnr values with the temperature can also be observed in other studies in the literature for RET or WCO-modified binders [26,52,56]. Additionally, PMB is least affected by temperature increase.…”

Property deterioration in reactive elastomeric terpolymer modified binders during storage at elevated temperatures

“…Comprehensive analysis was carried out using the RET 1 polymer as it is extensively used commercially, while RET 2 polymer was used to ascertain the effect of changes in the RET polymer composition. RET 1 is an E-nBA-GMA (ethylene-n-butyl acrylate-glycidyl methacrylate) terpolymer, while RET 2 is an E-E-GMA (ethylene-ester-glycidyl methacrylate) terpolymer [27]. 1H NMR con rms the presence of n-butyl acrylate and vinyl acetate units in RET 1 and RET 2 , respectively.…”