Rejuvenation Mechanism of Asphalt Mixtures Modified with Crumb Rubber
Asphalt aging is one of the main factors causing asphalt pavements deterioration. Previous studies reported on some aging benefits of asphalt rubber mixtures through laboratory evaluation. A field observation of various pavement sections of crumb rubber modified asphalt friction courses (ARFC) in th...
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doaj-4eb881b458534ecdad0f1c08aaa785ef2021-05-31T23:51:01ZengMDPI AGCivilEng2673-41092021-05-0122037038410.3390/civileng2020020Rejuvenation Mechanism of Asphalt Mixtures Modified with Crumb RubberHossein Noorvand0Kamil Kaloush1Jose Medina2Shane Underwood3School of Sustainable Engineering and the Built Environment, Arizona State University, P.O. Box 873005, Tempe, AZ 85287-3005, USASchool of Sustainable Engineering and the Built Environment, Arizona State University, P.O. Box 873005, Tempe, AZ 85287-3005, USASchool of Sustainable Engineering and the Built Environment, Arizona State University, P.O. Box 873005, Tempe, AZ 85287-3005, USADepartment of Civil, Construction, and Environmental Engineering, North Carolina State University, Raleigh, NC 27695-7908, USAAsphalt aging is one of the main factors causing asphalt pavements deterioration. Previous studies reported on some aging benefits of asphalt rubber mixtures through laboratory evaluation. A field observation of various pavement sections of crumb rubber modified asphalt friction courses (ARFC) in the Phoenix, Arizona area indicated an interesting pattern of transverse/reflective cracking. These ARFC courses were placed several years ago on existing jointed plain concrete pavements for highway noise mitigation. Over the years, the shoulders had very noticeable and extensive cracking over the joints; however, the driving lanes of the pavement showed less cracking formation in severity and extent. The issue with this phenomenon is that widely adopted theories that stem from continuum mechanics of materials and layered mechanics of pavement systems cannot directly explain this phenomenon. One hypothesis could be that traffic loads continually manipulate the pavement over time, which causes some maltenes (oils and resins) compounds absorbed in the crumb rubber particles to migrate out leading to rejuvenation of the mastic in the asphalt mixture. To investigate the validity of such a hypothesis, an experimental laboratory testing was undertaken to condition samples with and without dynamic loads at high temperatures. This was followed by creep compliance and indirect tensile strength testing. The results showed the higher creep for samples aged with dynamic loading compared to those aged without loading. Higher creep compliance was attributed to higher flexibility of samples due to the rejuvenation of the maltenes. This was also supported by the higher fracture energy results obtained for samples conditioned with dynamic loading from indirect tensile strength testing.https://www.mdpi.com/2673-4109/2/2/20crumb rubberasphalt mixturesrejuvenationswellingagingdynamic load |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Hossein Noorvand Kamil Kaloush Jose Medina Shane Underwood |
spellingShingle |
Hossein Noorvand Kamil Kaloush Jose Medina Shane Underwood Rejuvenation Mechanism of Asphalt Mixtures Modified with Crumb Rubber CivilEng crumb rubber asphalt mixtures rejuvenation swelling aging dynamic load |
author_facet |
Hossein Noorvand Kamil Kaloush Jose Medina Shane Underwood |
author_sort |
Hossein Noorvand |
title |
Rejuvenation Mechanism of Asphalt Mixtures Modified with Crumb Rubber |
title_short |
Rejuvenation Mechanism of Asphalt Mixtures Modified with Crumb Rubber |
title_full |
Rejuvenation Mechanism of Asphalt Mixtures Modified with Crumb Rubber |
title_fullStr |
Rejuvenation Mechanism of Asphalt Mixtures Modified with Crumb Rubber |
title_full_unstemmed |
Rejuvenation Mechanism of Asphalt Mixtures Modified with Crumb Rubber |
title_sort |
rejuvenation mechanism of asphalt mixtures modified with crumb rubber |
publisher |
MDPI AG |
series |
CivilEng |
issn |
2673-4109 |
publishDate |
2021-05-01 |
description |
Asphalt aging is one of the main factors causing asphalt pavements deterioration. Previous studies reported on some aging benefits of asphalt rubber mixtures through laboratory evaluation. A field observation of various pavement sections of crumb rubber modified asphalt friction courses (ARFC) in the Phoenix, Arizona area indicated an interesting pattern of transverse/reflective cracking. These ARFC courses were placed several years ago on existing jointed plain concrete pavements for highway noise mitigation. Over the years, the shoulders had very noticeable and extensive cracking over the joints; however, the driving lanes of the pavement showed less cracking formation in severity and extent. The issue with this phenomenon is that widely adopted theories that stem from continuum mechanics of materials and layered mechanics of pavement systems cannot directly explain this phenomenon. One hypothesis could be that traffic loads continually manipulate the pavement over time, which causes some maltenes (oils and resins) compounds absorbed in the crumb rubber particles to migrate out leading to rejuvenation of the mastic in the asphalt mixture. To investigate the validity of such a hypothesis, an experimental laboratory testing was undertaken to condition samples with and without dynamic loads at high temperatures. This was followed by creep compliance and indirect tensile strength testing. The results showed the higher creep for samples aged with dynamic loading compared to those aged without loading. Higher creep compliance was attributed to higher flexibility of samples due to the rejuvenation of the maltenes. This was also supported by the higher fracture energy results obtained for samples conditioned with dynamic loading from indirect tensile strength testing. |
topic |
crumb rubber asphalt mixtures rejuvenation swelling aging dynamic load |
url |
https://www.mdpi.com/2673-4109/2/2/20 |
work_keys_str_mv |
AT hosseinnoorvand rejuvenationmechanismofasphaltmixturesmodifiedwithcrumbrubber AT kamilkaloush rejuvenationmechanismofasphaltmixturesmodifiedwithcrumbrubber AT josemedina rejuvenationmechanismofasphaltmixturesmodifiedwithcrumbrubber AT shaneunderwood rejuvenationmechanismofasphaltmixturesmodifiedwithcrumbrubber |
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