EVALUATION OF FRACTURE TOUGHNESS OF WARM-MIX ASPHALT CONTAINING NATURAL AND SYNTHESIS FIBERS AT LOW TEMPERATURES
Compared to typical hot-mix asphalt (HMA), Warm-mix asphalt (WMA) is produced at a lower temperature; therefore, it can be a good alternative for pavement located in cold climates. On t...
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Sharif University of Technology
2019-08-01
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Online Access: | https://sjce.journals.sharif.edu/article_20905_eddafddd00897bd2a4afc6b269ce1694.pdf |
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author | A. Mansourian A. Razmi M. Razavi M.R. Mohammad Aliha |
author_facet | A. Mansourian A. Razmi M. Razavi M.R. Mohammad Aliha |
author_sort | A. Mansourian |
collection | DOAJ |
description | Compared to typical hot-mix asphalt (HMA), Warm-mix asphalt (WMA) is produced at a lower temperature; therefore, it can be a good alternative for pavement located in cold climates. On the other hand, the low-temperature cracking is one of the main concerns of highways agencies in cold climates. Many different additives including fibers have been used for improving hot-mix asphalt
performance; however, a few types of research have been conducted to investigate the effects of fibers on warm-mix asphalt performance. In this
paper, warm-mix asphalt containing Sasobit and different percentages of natural
and synthesis fibers (0.7\%, 0.5\% and 0.3\% by weight of the total warm mix
asphalt) were prepared by gyratory compactor. The cylinder specimens were cut
to prepare semi-circular bending (SCB) specimens to determine the critical intensity factor (fracture toughness) of the warm-mix asphalt specimens. Using
ABAQUS software the finite element analysis was conducted to determine the
geometry factors and crack positions for pure tension (mode I), pure shear
(mode II) and mixed modes (I/II). The cracked specimens were loaded at a
constant rate (3 mm/min) at 0 oC, -10 oC and -20 oC until they were fractured; then the fracture toughness of each specimen was calculated. Analysis of testr esults indicated that the fracture toughness of warm-mix asphalt specimens containing natural or synthesis fibers increased when the temperature test
decreased. In addition, the tests results showed that fracture toughness of
warm mix specimens containing natural or synthesis fibers in mixed mode (with
the same portion of tension and shear) and pure tension mode are higher than
that of the control asphalt mixtures. However, this trend was not observed for
loading modes with the higher portion of shear, especially for specimens containing natural fibers. Furthermore, in the same percentages of fibers, the
effect of synthesis fibers to improve the fracture toughness of the mixtures
was higher than that of the natural fibers. |
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issn | 2676-4768 2676-4776 |
language | fas |
last_indexed | 2024-03-12T13:47:47Z |
publishDate | 2019-08-01 |
publisher | Sharif University of Technology |
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series | مهندسی عمران شریف |
spelling | doaj.art-24d52c0aa30441bf9798e36cf23c46ef2023-08-23T08:03:33ZfasSharif University of Technologyمهندسی عمران شریف2676-47682676-47762019-08-0135.22.2293810.24200/j30.2018.2139.210720905EVALUATION OF FRACTURE TOUGHNESS OF WARM-MIX ASPHALT CONTAINING NATURAL AND SYNTHESIS FIBERS AT LOW TEMPERATURESA. Mansourian0A. Razmi1M. Razavi2M.R. Mohammad Aliha3Dept. of Bitumen and Asphalt, Road Housing and Urban development Research CenterFaculty of Engineering Ahar Branch, Islamic Azad UniversityFaculty of Engineering Ahar Branch, Islamic Azad UniversityDept. of Industrial Engineering Iran University of Science and TechnologyCompared to typical hot-mix asphalt (HMA), Warm-mix asphalt (WMA) is produced at a lower temperature; therefore, it can be a good alternative for pavement located in cold climates. On the other hand, the low-temperature cracking is one of the main concerns of highways agencies in cold climates. Many different additives including fibers have been used for improving hot-mix asphalt performance; however, a few types of research have been conducted to investigate the effects of fibers on warm-mix asphalt performance. In this paper, warm-mix asphalt containing Sasobit and different percentages of natural and synthesis fibers (0.7\%, 0.5\% and 0.3\% by weight of the total warm mix asphalt) were prepared by gyratory compactor. The cylinder specimens were cut to prepare semi-circular bending (SCB) specimens to determine the critical intensity factor (fracture toughness) of the warm-mix asphalt specimens. Using ABAQUS software the finite element analysis was conducted to determine the geometry factors and crack positions for pure tension (mode I), pure shear (mode II) and mixed modes (I/II). The cracked specimens were loaded at a constant rate (3 mm/min) at 0 oC, -10 oC and -20 oC until they were fractured; then the fracture toughness of each specimen was calculated. Analysis of testr esults indicated that the fracture toughness of warm-mix asphalt specimens containing natural or synthesis fibers increased when the temperature test decreased. In addition, the tests results showed that fracture toughness of warm mix specimens containing natural or synthesis fibers in mixed mode (with the same portion of tension and shear) and pure tension mode are higher than that of the control asphalt mixtures. However, this trend was not observed for loading modes with the higher portion of shear, especially for specimens containing natural fibers. Furthermore, in the same percentages of fibers, the effect of synthesis fibers to improve the fracture toughness of the mixtures was higher than that of the natural fibers.https://sjce.journals.sharif.edu/article_20905_eddafddd00897bd2a4afc6b269ce1694.pdfwarm-mix asphaltfracture toughnesslow temperaturenatural fiberssynthesis fibers |
spellingShingle | A. Mansourian A. Razmi M. Razavi M.R. Mohammad Aliha EVALUATION OF FRACTURE TOUGHNESS OF WARM-MIX ASPHALT CONTAINING NATURAL AND SYNTHESIS FIBERS AT LOW TEMPERATURES مهندسی عمران شریف warm-mix asphalt fracture toughness low temperature natural fibers synthesis fibers |
title | EVALUATION OF FRACTURE TOUGHNESS OF WARM-MIX ASPHALT CONTAINING NATURAL AND SYNTHESIS FIBERS AT LOW TEMPERATURES |
title_full | EVALUATION OF FRACTURE TOUGHNESS OF WARM-MIX ASPHALT CONTAINING NATURAL AND SYNTHESIS FIBERS AT LOW TEMPERATURES |
title_fullStr | EVALUATION OF FRACTURE TOUGHNESS OF WARM-MIX ASPHALT CONTAINING NATURAL AND SYNTHESIS FIBERS AT LOW TEMPERATURES |
title_full_unstemmed | EVALUATION OF FRACTURE TOUGHNESS OF WARM-MIX ASPHALT CONTAINING NATURAL AND SYNTHESIS FIBERS AT LOW TEMPERATURES |
title_short | EVALUATION OF FRACTURE TOUGHNESS OF WARM-MIX ASPHALT CONTAINING NATURAL AND SYNTHESIS FIBERS AT LOW TEMPERATURES |
title_sort | evaluation of fracture toughness of warm mix asphalt containing natural and synthesis fibers at low temperatures |
topic | warm-mix asphalt fracture toughness low temperature natural fibers synthesis fibers |
url | https://sjce.journals.sharif.edu/article_20905_eddafddd00897bd2a4afc6b269ce1694.pdf |
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