Evaluation of Fatigue Life of CRM-Reinforced SMA and Its Relationship to Dynamic Stiffness
Fatigue cracking is an essential problem of asphalt concrete that contributes to pavement damage. Although stone matrix asphalt (SMA) has significantly provided resistance to rutting failure, its resistance to fatigue failure is yet to be fully addressed. The aim of this study is to evaluate the eff...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2014-01-01
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| Series: | The Scientific World Journal |
| Online Access: | http://dx.doi.org/10.1155/2014/968075 |
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| author | Nuha Salim Mashaan Mohamed Rehan Karim Mahrez Abdel Aziz Mohd Rasdan Ibrahim Herda Yati Katman Suhana Koting |
| author_facet | Nuha Salim Mashaan Mohamed Rehan Karim Mahrez Abdel Aziz Mohd Rasdan Ibrahim Herda Yati Katman Suhana Koting |
| author_sort | Nuha Salim Mashaan |
| collection | DOAJ |
| description | Fatigue cracking is an essential problem of asphalt concrete that contributes to pavement damage. Although stone matrix asphalt (SMA) has significantly provided resistance to rutting failure, its resistance to fatigue failure is yet to be fully addressed. The aim of this study is to evaluate the effect of crumb rubber modifier (CRM) on stiffness and fatigue properties of SMA mixtures at optimum binder content, using four different modification levels, namely, 6%, 8%, 10%, and 12% CRM by weight of the bitumen. The testing undertaken on the asphalt mix comprises the dynamic stiffness (indirect tensile test), dynamic creep (repeated load creep), and fatigue test (indirect tensile fatigue test) at temperature of 25°C. The indirect tensile fatigue test was conducted at three different stress levels (200, 300, and 400 kPa). Experimental results indicate that CRM-reinforced SMA mixtures exhibit significantly higher fatigue life compared to the mixtures without CRM. Further, higher correlation coefficient was obtained between the fatigue life and resilient modulus as compared to permanent strain; thus resilient modulus might be a more reliable indicator in evaluating the fatigue life of asphalt mixture. |
| format | Article |
| id | doaj-art-0a25e635fa2f4c308e06d1bace3142d1 |
| institution | Kabale University |
| issn | 2356-6140 1537-744X |
| language | English |
| publishDate | 2014-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | The Scientific World Journal |
| spelling | doaj-art-0a25e635fa2f4c308e06d1bace3142d12025-02-03T01:21:42ZengWileyThe Scientific World Journal2356-61401537-744X2014-01-01201410.1155/2014/968075968075Evaluation of Fatigue Life of CRM-Reinforced SMA and Its Relationship to Dynamic StiffnessNuha Salim Mashaan0Mohamed Rehan Karim1Mahrez Abdel Aziz2Mohd Rasdan Ibrahim3Herda Yati Katman4Suhana Koting5Center for Transportation Research, Civil Engineering Department, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, MalaysiaCenter for Transportation Research, Civil Engineering Department, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, MalaysiaCenter for Transportation Research, Civil Engineering Department, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, MalaysiaCenter for Transportation Research, Civil Engineering Department, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, MalaysiaCenter for Transportation Research, Civil Engineering Department, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, MalaysiaCenter for Transportation Research, Civil Engineering Department, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, MalaysiaFatigue cracking is an essential problem of asphalt concrete that contributes to pavement damage. Although stone matrix asphalt (SMA) has significantly provided resistance to rutting failure, its resistance to fatigue failure is yet to be fully addressed. The aim of this study is to evaluate the effect of crumb rubber modifier (CRM) on stiffness and fatigue properties of SMA mixtures at optimum binder content, using four different modification levels, namely, 6%, 8%, 10%, and 12% CRM by weight of the bitumen. The testing undertaken on the asphalt mix comprises the dynamic stiffness (indirect tensile test), dynamic creep (repeated load creep), and fatigue test (indirect tensile fatigue test) at temperature of 25°C. The indirect tensile fatigue test was conducted at three different stress levels (200, 300, and 400 kPa). Experimental results indicate that CRM-reinforced SMA mixtures exhibit significantly higher fatigue life compared to the mixtures without CRM. Further, higher correlation coefficient was obtained between the fatigue life and resilient modulus as compared to permanent strain; thus resilient modulus might be a more reliable indicator in evaluating the fatigue life of asphalt mixture.http://dx.doi.org/10.1155/2014/968075 |
| spellingShingle | Nuha Salim Mashaan Mohamed Rehan Karim Mahrez Abdel Aziz Mohd Rasdan Ibrahim Herda Yati Katman Suhana Koting Evaluation of Fatigue Life of CRM-Reinforced SMA and Its Relationship to Dynamic Stiffness The Scientific World Journal |
| title | Evaluation of Fatigue Life of CRM-Reinforced SMA and Its Relationship to Dynamic Stiffness |
| title_full | Evaluation of Fatigue Life of CRM-Reinforced SMA and Its Relationship to Dynamic Stiffness |
| title_fullStr | Evaluation of Fatigue Life of CRM-Reinforced SMA and Its Relationship to Dynamic Stiffness |
| title_full_unstemmed | Evaluation of Fatigue Life of CRM-Reinforced SMA and Its Relationship to Dynamic Stiffness |
| title_short | Evaluation of Fatigue Life of CRM-Reinforced SMA and Its Relationship to Dynamic Stiffness |
| title_sort | evaluation of fatigue life of crm reinforced sma and its relationship to dynamic stiffness |
| url | http://dx.doi.org/10.1155/2014/968075 |
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