Mechanism and Performance of Bituminous Mixture Using 100% Content RAP with Bio-Rejuvenated Additive (BRA)

Abstract

The low RAP content, hot mixing conditions, and the addition of a high ratio of new bitumen and aggregates result in low economic and environmental benefits for current regeneration technologies. A bio-rejuvenated additive (BRA) that can fully (100%) regenerate the RAP without heating is proposed in this paper. To reveal the mechanisms of BRA-rejuvenated RAP, the effects of BRA on the chemical structure and molecular weight of the RAP were investigated using Fourier-transform infrared spectroscopy and gel permeation chromatography. The mechanical performance and water damage resistance of BRA-rejuvenated RAP were studied. Low contents of new bitumen or epoxy resin were suggested to increase the mechanical performance of 100% RAP. The results show that the 1.5% BRA-rejuvenated RAP had the best mechanical performance. The blending of BRA with recycled RAP is a completely physical process, without any chemical reactions. The molecular weight of BRA is lower than that of bitumen; it can substantially increase the content of light components in aged bitumen, and play the role of adjusting and restoring the balance of the components of aged bitumen. The mechanical performance of BRA-rejuvenated RAP is enhanced significantly by adding low dosages of new bitumen or epoxy resin.

Investigation on the technical performance and workability of hot-melting road marking materials using for the high-altitude area

“…It can be seen from Fig. 4 that the main functional groups of the three kinds of paints are as follows: the double peaks near 2900 cm − 1 are caused by the antisymmetric and symmetric stretching vibration of alkane CH 2 and its derivatives, indicating that there are more long-chain alkanes in the paint; 1440 cm − 1 is the absorption peak superposed by CH 2 bending vibration and CH 3 asymmetric bending vibration of alkanes; 870 cm − 1 is the absorption peak caused by the out of plane bending vibration of benzene aromatic CH; 720 cm − 1 is the absorption peak caused by the plane swing of alkane CH 2 [32]. Compared with the original paint, the 5% T and 5% T + A pastes have increased three obvious infrared absorption peaks of 1740 cm − 1 , 1240 cm − 1 and 1020 cm − 1 .…”

Modification Mechanism and Technical Performance of Recycled PE-Modified Asphalt

“…The main waste polymer products are polyethylene (PE) [3], polyvinyl chloride, polyethylene terephthalate, ethylene vinyl acetate copolymer [10], etc. Recycled polyethylene (RPE)-based plastics melt at about 150 • C [11], have better low-temperature properties [12,13], and are one of the most suitable waste plastics for use as asphalt modifiers [14]. Alghrafy et al [15] investigated the influence of RPE on the rheology and fatigue properties of modified asphalt and concluded that asphalt made from RPE has better resistance to rutting and fatigue cracking after hardening.…”

Quantitative Assessment of Road Performance of Recycled Asphalt Mixtures Incorporated with Steel Slag

“…Some approaches to characterize and classify the RAP were applied to promote its popularization and utilization [ 17 ]. Chen et al investigated the mechanism and performance of mixtures with 100% dosage RAP and bio-rejuvenated additive (BRA) and found that BRA restores the balance of the components of aged bitumen and elevate mechanical performance of asphalt mixtures [ 18 ]. Similar studies had also been reported by Zaumanis et al [ 19 ].…”