Engineering characterization of recycled asphalt concrete and aged bitumen mixed recycling agent

Chen, Jian‐Shiuh; Huang, Chun‐Chieh; Chu, P. Y.; Lin, Kang

doi:10.1007/s10853-007-1713-8

Cited by 68 publications

(25 citation statements)

References 4 publications

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“…Several other studies have indicated that mixing of old and new bitumen generally is good. Chen et al [2] also offers support to the conclusion by McDaniels et al [7] i.e., new and old binder do mix. On the other hand, Oliver [8] found indications of incomplete mixing; he noted a softer response for the asphalt concrete based on virgin material and RAP, than for the virgin binder only mix.…”

Section: Previous Findingsmentioning

confidence: 54%

“…Some of the more recent findings can be noted. Chen et al [2] defined a model based on Arrhenius (c.f. Sect.…”

Section: Previous Findingsmentioning

confidence: 99%

“…The mixing of old and new virgin binder is complex but can conceptually be described to be largely governed by three factors: (1) distribution (i.e., how the added binder is physically distributed), (2) mechanical mixing and (3) diffusion. While the two first factors probably occur almost instantaneously during asphalt mixing, diffusion represents a timedependent process affected by material properties, temperature and binder layer thicknesses.…”

Section: Introductionmentioning

confidence: 99%

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Soft bitumen asphalt produced using RAP

Ekblad

Lundström

2016

Mater Struct

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Soft bitumen asphalt concrete is a common paving material in Scandinavia. The purpose of this investigation was to indicate the possibility to compensate for the stiff binder of reclaimed asphalt pavement (RAP) by using softer binders compared to the mix design. Characterization of binder mixing and diffusion were carried out using viscosity measurements and tests on asphalt concrete comprised stiffness modulus and cyclic compression testing. Acquired results suggest that virgin and reclaimed binders mix and the viscosity can be predicted using simple mixing models. In the case of asphalt made from mixing virgin and recycled material, the mechanical properties indicates fully mixed binders and mixing occurs during sample manufacturing. In general, this study suggests that soft asphalt mixtures can be produced using RAP and that nominal binder viscosity of the final product can be obtained by compensating the stiff binder of the RAP by virgin bitumen of a softer grade.

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Section: Previous Findingsmentioning

confidence: 54%

“…Some of the more recent findings can be noted. Chen et al [2] defined a model based on Arrhenius (c.f. Sect.…”

Section: Previous Findingsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Soft bitumen asphalt produced using RAP

Ekblad

Lundström

2016

Mater Struct

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“…RAP is defined as "asphalt reclaimed by milling of asphalt road layers, by crushing of slabs ripped up from asphalt pavements or lumps from asphalt slabs and asphalt from reject and surplus production" by EN 13108-8. Some RAP can be characterized as "black rock", that is, bitumen will not be able to act as a binder for asphalt with conventional mixing procedures, but most RAP is able to recover a part of its adhesive abilities (Chen et al 2007).…”

Section: Introductionmentioning

confidence: 99%

“…Without the recycling agents, the % RAP that can compose the new pavement is much more limited. It is important that the recycling agent be compatible with the given RAP that is, being able to contact and interact with the old bitumen (Chen et al 2007). …”

Section: Introductionmentioning

confidence: 99%

Methods for Analyzing the Chemical Mechanisms of Bitumen Aging and Rejuvenation with FTIR Spectrometry

2015

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The recycling of asphalt is a process where old pavement is broken up and used as reclaimed asphalt pavement (RAP) in new asphalt pavement, often with the aid of recycling agents. The goal of asphalt recycling agents is to reintroduce the properties lost in bitumen and asphalt during aging such as penetration, softening point, viscosity, ductility, cohesion and adhesion to aggregate, reducing the performance of asphalt and requiring its replacement. The purpose of this study is to observe the chemistry of bitumen aging and the effects of recycling agents may have in reversing it. Fourier transform infrared spectroscopy (FTIR)-attenuated total reflectance (ATR) was used to analyse the bitumen aging and regeneration in terms of the evolution of carbonyl, sulfoxide and other bands. FTIR-ATR microscopy was used to study the distribution of these bands between the aggregates in order to understand the remobilization of the old asphalt (RAP) by the recycling agents through observing their penetration into the RAP. A method for aging bitumen and mastic in a ventilated oven was developed. An increase in C=O and S=O indices was observed with aging, plateauing after 7d.

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