Behaviour of recycled asphalt pavements at low temperatures

Sargious, Michel; Mushule, N.

doi:10.1139/l91-053

Cited by 26 publications

(9 citation statements)

References 2 publications

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“…For example, Tam et al (8) found that mixes with RAP are less resistant to thermal cracking than non-recycled mixtures, while Kandhal et al (9) found no significant difference in cracking performance, and Sargious and Mushule (10) found that a recycled mixture performed better than a virgin mixture in terms of cracking. The mixture behavior is responsive to binder properties at low, intermediate and high temperatures.…”

Section: Summary Of Literature Reviewmentioning

confidence: 99%

Use of Reclaimed Asphalt Pavement (RAP) Under Superpave Specifications: A Regional Pooled Fund Project

McDaniel¹,

Soleymani²,

Shah³

2002

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Prepared in cooperation with the Indiana Department of Transportation and Federal Highway Administration. AbstractThis regional pooled fund project was conducted to investigate the performance of Superpave asphalt mixtures incorporating RAP. This study was closely coordinated with a national study on the same topic (NCHRP 9-12, Incorporation of Reclaimed Asphalt Pavement in the Superpave System). Specifically, this regional project looked at typical materials from the North Central United States to determine if the findings of NCHRP 9-12 were valid for Midwestern materials and to expand the NCHRP findings to include higher RAP contents.Three RAP materials from Indiana, Michigan and Missouri were evaluated. Mixtures were designed and tested in the laboratory with each RAP, virgin binder and virgin aggregate at RAP contents up to 50%. The laboratory mixtures were compared to plant produced mixtures with the same materials at the medium RAP content of 15-25%. Binder and mixture tests were performed.Briefly, the results showed that mixtures with up to 50% RAP could be designed under Superpave, provided the RAP gradation and aggregate quality were sufficient. In some cases, the RAP aggregates limited the amount of RAP that could be included in a new mix design to meet the Superpave volumetric and compaction requirements. Linear binder blending charts were found to be appropriate in most cases. In general, increasing the RAP content of a mixture increased its stiffness and decreased its shear strain, indicating increased resistance to rutting. It is important to consider the RAP aggregate gradation and quality in the mix design, since a poor aggregate structure could reduce mixture stiffness and ultimately performance.Provided the RAP properties are properly accounted for in the material selection and mix design process, Superpave mixtures with RAP can perform very well. Key WordsReclaimed Asphalt Pavement, RAP, recycling, Superpave, hot mix asphalt, rutting The objectives of this regional project, then, were to:• Expand the research conducted under NCHRP 9-12 to examine more materials, particularly those common to the North Central region, • Investigate higher proportions of RAP in the mixtures, and • Focus on mixture properties and the effects of RAP on those properties. The objectives were addressed by comparing mixtures produced in the laboratory with different proportions of RAP and virgin materials. Three RAP sources were investigated at RAP contents up to 50%. Indiana, Michigan and Missouri provided RAP and virgin materials for use in the study. For each RAP source, a laboratory mix was also compared to a plant-produced mix with the same RAP content. Binder and mixture tests were performed following protocols established in NCHRP 9-12.. FindingsThe study demonstrated that acceptable Superpave mixtures can be designed with up to 50% RAP. Aggregate quality and gradation in the RAP material may limit the amount of RAP that can be incorporated.Linear blending charts, as recommended in NCHRP 9-12, were found to be a...

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Section: Summary Of Literature Reviewmentioning

confidence: 99%

Use of Reclaimed Asphalt Pavement (RAP) Under Superpave Specifications: A Regional Pooled Fund Project

McDaniel¹,

Soleymani²,

Shah³

2002

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“…Through literature analysis, transfer law of aged asphalt from old aggregate to new aggregate accords with convective mass transfer theory [6]. Further analysis of convective mass transfer theory is helpful to understand the mechanism of asphalt transfer and recycling.…”

Section: Analysis For Transfer Mechanism Of Asphalt Binder Based mentioning

confidence: 60%

Investigation of Aged Asphalt Film Transfer during Hot In-Place Recycling of Asphalt Pavement

Bian

Yuan³

2011

2011 International Conference on Management and Service Science

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The aged asphalt film transfer between new and old aggregate during hot in-place recycling of asphalt pavement was investigated in this paper. The mechanism of asphalt film transfer between new and old mixture was analyzed by connective mass transfer theory. Based on the theoretical analysis, influence factors for asphalt film transfer during hot in-place recycling were summarized. Then laboratory tests simulating the file hot in-place recycling process were conducted to investigated the asphalt film transfer between new and old aggregate based on different influence factors design. The test results indicated that preheating temperature, mixing time and recycling agent are the key influence factors during hot in-place recycling process. Suggestions to guarantee the quality of hot in-place recycling asphalt mixture were given in this paper.

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“…Similar to conventional non-modified asphalt binder, polymer modified binder also becomes harden due to the weathering [5,6] . To confirm the aging performance of polymer modified asphalt binder, the force-ductility tests were conducted for non-modified binder and styrene-butadiene-styrene block copolymers (SBS) modified asphalt binder.…”

Section: Introductionmentioning

confidence: 99%

Compound rejuvenation of polymer modified asphalt binder

Huang

Hussain

2010

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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The objective of this research was to show a way to conduct rejuvenation of aged polymer modified asphalt binder (PMB) successfully. To fully evaluate and understand the rejuvenation of aged PMB, the Penetration grade tests including penetration, soften point, ductility and elastic recovery and Superpave TM PG grade tests including DSR, BBR and DDT were conducted. The rejuvenation effect of aged PMB by utilizing a fluid recycling agent in common use for binder rejuvenation was evaluated. And then the compound rejuvenation effect of aged PMB by utilizing the recycling agent with a new modifying additive for binder modification was evaluated. The experimental results indicated that the recycling agent in common use currently does not apply to polymer modified asphalt binder rejuvenation. But the recycling agent together with the modifying additive can restore the characteristics of aged polymer modified binder very well. Therefore, compound rejuvenation of polymer modified asphalt binder is recommended.

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Behaviour of recycled asphalt pavements at low temperatures

Cited by 26 publications

References 2 publications

Use of Reclaimed Asphalt Pavement (RAP) Under Superpave Specifications: A Regional Pooled Fund Project

Use of Reclaimed Asphalt Pavement (RAP) Under Superpave Specifications: A Regional Pooled Fund Project

Investigation of Aged Asphalt Film Transfer during Hot In-Place Recycling of Asphalt Pavement

Compound rejuvenation of polymer modified asphalt binder

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