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- Title
EXPERIMENTAL EVALUATION OF HOT MIX ASPHALT USING COAL BOTTOM ASH AS PARTIAL FILLER REPLACEMENT.
- Authors
KAMRAN, MUHAMMAD; KHAN, MUHAMMAD TARIQ; KHAN, DIYAR; HASAN, MOHD ROSLI MOHD; KHAN, NOMAN; ULLAH, MATI
- Abstract
The purpose of this study is to evaluate the performance of hot mix asphalt (HMA) prepared with coal bottom ash (CBA) as an alternative mineral filler. In this study, the effect of CBA on rutting, stiffness and fatigue resistance was experimentally evaluated. Combinations of conventional filler (stone dust) with different percentages of CBA (at 1.5%, 3%, and 4.5% by volume) were adopted. The HMA samples were prepared and tested using the Marshall mix design method. Following the Asphalt Institute MS-2 and the Pakistani NationalHighwayAuthority(NHA)GeneralSpecifications, sixtysamples of HMA were compacted; stability tests at varying bitumen contents (3.5%, 4.0%, 4.5%, 5.0%, and 5.5%) were used to determine the optimum bitumen content (OBC) in the mixture for each percentage of CBAinthefiller. For0%,1.5%,3%, and 4.5% CBA, the optimumbitumen contents of 4.27%, 4.47%, 4.53%, and5.0%wereobtained, respectively. They were used throughout the study. Three samples with the optimum binder content were made for eachofthefour analysed CBAproportions. The wheel tracker test was run on 12 OBC samples, and the dynamic modulus test was run on 12 OBC samples. The Marshall stability and flowtest resultsshowed that thesamplesprepared with 3%CBAasfiller and an OBC of 4.53% satisfied the NHA requirements for flexible pavement. It was noted that CBA greatly improves the rutting resistance and stiffness of asphalt mixtures. It also improved the fatigue life. Therefore, addingupto3%CBAbyvolumetostonedustused asfiller in asphalt concrete can minimize the need for stone dust and provide a suitable method of CBA disposal.
- Subjects
COAL ash; FATIGUE limit; ASPHALT concrete; FATIGUE life; FLEXIBLE pavements; ASPHALT
- Publication
Roads & Bridges / Drogi i Mosty, 2023, Vol 22, Issue 2, p167
- ISSN
1643-1618
- Publication type
Article
- DOI
10.7409/rabdim.023.008