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Effect of crumb rubber modifier on fatigue of warm mix asphalt

Saeed, Saeed Modibbo and Aman, Mohamad Yusri and Ahmad, Kabiru Abdullahi and Batari, Ahmad and Ahmed, T. Y. and Chinade, A. U. (2017) Effect of crumb rubber modifier on fatigue of warm mix asphalt. In: Global Civil Engineering Conference (GCEC 2017), 25-28 July 2017, Kuala Lumpur, Malaysia.

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Abstract

Crumb rubber from waste tires is incorporated into asphalt mixtures as one of the successful strategies employed to improve the fatigue resistance of asphalt pavement and also deal with the millions of waste tires that are progressively occupying landfills and causing environmental challenges. Fatigue cracking is classified as one of the main asphalt pavement distress which requires to be dealt with at the design stage of bituminous pavement. However, the degree of effectiveness and the percentage of CRM that gives the best fatigue resistance has not been firmly established. In this study, the effect of percentage crumb rubber on the fatigue of rubberised warm mix asphalt mixtures was evaluated. A penetration grade of 80/100 bitumen, crush granite aggregate with 9.5mm NMAS, Sasobit at 2.5% by weight of the binder was blended with the bitumen to achieve a warm mix binder. Crumb rubber of size passing 0.150mm sieve was incorporated into the WMA mixes at 0%, 10% 15% and 20% by weight of the virgin binder using the wet process of modification to determine the effect of percentage crumb rubber on fatigue of the mixtures. The Specimens fabrication was done in accordance with Superpave and compacted using SGC at design compaction effort of 100 gyrations using 100mm diameter mold. Indirect Tensile Fatigue Test (ITFT) was conducted on the specimens at a temperature of 250C. The test was conducted at three levels of stress (500kPa, 600kPa and 700kPa). The laboratory results findings indicate that the CRM significantly influence the fatigue life of the mixtures. Based on the fatigue predictive life model, the 20% CRM have the highest fatigue life compared to the other CRM percentages considered in this study.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Crumb rubber; fatigue; warm mix asphalt
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA401-492 Materials of engineering and construction. Mechanics of materials
Divisions: Faculty of Civil and Environmental Engineering > Department of Infrastructure and Geomatic Engineering
Depositing User: Mr. Mohammad Shaifulrip Ithnin
Date Deposited: 30 Sep 2019 03:19
Last Modified: 30 Sep 2019 03:19
URI: http://eprints.uthm.edu.my/id/eprint/11640
Statistic Details: View Download Statistic

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