Journal ArticleDOI
Evaluating the effect of rejuvenators on the degree of blending and performance of high RAP, RAS, and RAP/RAS mixtures
TLDR
In this article, the authors examined if asphalt rejuvenators can offset the stiffness attributed by the hardened binder from reclaimed asphalt pavement (RAP) and reclaimed asphalt shingles (RAS) in mixtures that incorporate high RAP and RAS content without adverse impact on the performance of the mixtures.Abstract:
The objective of this study was to examine if asphalt rejuvenators can offset the stiffness attributed by the hardened binder from reclaimed asphalt pavement (RAP) and reclaimed asphalt shingles (RAS) in mixtures that incorporate high RAP and RAS content without adverse impact on the performance of the mixtures. Also, to assess, if rejuvenators can help the hardened binder from the RAP/RAS comingle with the virgin binder. Overall, the results showed that asphalt rejuvenators can mitigate the stiffness of the resultant binder. The cracking characteristics of the mixture improved by the addition of the rejuvenators, however, the rutting and moisture susceptibility were adversely impacted at the dosage and the testing conditions used. Also, the tests results at 4°C generally showed that there was blending of the rejuvenated and virgin binder, however, no conclusion could be made at the higher temperatures.read more
Citations
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Journal ArticleDOI
Review of very high-content reclaimed asphalt use in plant-produced pavements: state of the art
TL;DR: In this paper, the state-of-the-art approaches for increasing the amount of reclaimed asphalt pavement (RAP) in asphalt mixtures above 40% are summarized and methods to optimise the mix design as well as production technology in order to allow manufacturing of such sustainable mixtures are described.
Journal ArticleDOI
Application of rejuvenators to improve the rheological and mechanical properties of asphalt binders and mixtures: A review
TL;DR: A review of the literature on the applications of various types of rejuvenators in paving industry and their effects on the properties of the aged binders is presented in this paper, where the techniques for rejuvenating the aged asphalt binders and the mechanism of rejuvenation are also reviewed.
Journal ArticleDOI
The use of rejuvenating agents in production of recycled hot mix asphalt: A systematic review
TL;DR: In this article, the authors provide an overview on utilizing RAP, and the use of rejuvenators, type and dosage, in production of asphalt pavement, and provide a comparison between different rejuvenators.
Journal ArticleDOI
Determining optimum rejuvenator dose for asphalt recycling based on Superpave performance grade specifications
TL;DR: In this article, the changes in Superpave performance grade (PG) of Reclaimed Asphalt Pavement (RAP) binder were determined after addition of two doses of six rejuvenators.
Journal ArticleDOI
Use of recycling agents in asphalt mixtures with high recycled materials contents in the United States: A literature review
TL;DR: In this article, the authors summarized current knowledge related to the use of recycling agents in the asphalt pavement industry, including properties of recycled and rejuvenated asphalt mixtures, and identified current and future challenges that could prevent utilization of recycling agent and production of rejuvenated mixtures with adequate performance.
References
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American association of state highway and transportation officials computer systems index
M L Yancey Jr,K Close +1 more
TL;DR: In this article, an inventory of information systems associated with the transportation engineering and transportation administrative fields, lists systems in the area of planning, engineering, finance, administration, and management.
Hirsch model for estimating the modulus of asphalt concrete
TL;DR: In this article, the authors present a new, rational and effective model for estimating the modulus of asphalt concrete using binder modulus and volumetric composition, based upon an existing version of the law of mixtures, which combines series and parallel elements of phases.
Reclaimed Asphalt Pavement in Asphalt Mixtures: State of the Practice
TL;DR: The use of reclaimed asphalt pavement (RAP) is a useful alternative to virgin materials because it reduces the need to use virgin aggregate, which is a scarce commodity in some areas of the United States as mentioned in this paper.
Interpretation of dynamic mechanical test data for paving grade asphalt cements
D W Christensen,D A Anderson +1 more
Abstract: Dynamic mechanical analysis, and other methods of rheological testing, have been used for many years on asphalt cement. Unfortunately, there currently exists some confusion over the interpretation of dynamic mechanical data on asphalt cements. In order to clarify appropriate methods of interpreting rheological data on paving grade asphalts, test data for a number of asphalt cements having widely different properties must be analyzed in light of rheological theory and appropriate mathematical models. The purpose of this paper is to describe various useful techniques for interpreting viscoelastic data on asphalt cements. Dynamic mechanical test data is emphasized, although many of the principles presented apply equally well to other types of rheological data.
Journal ArticleDOI
Laboratory Investigation of Mixing Hot-Mix Asphalt with Reclaimed Asphalt Pavement
TL;DR: In this article, the blending process of reclaimed asphalt pavement (RAP) with virgin mixture was analyzed through controlled experiments, where one type of screened RAP was blended with virgin (new) coarse aggregate at different percentages.