Beneficiation of stockpiled fluidized bed coal ash in road base course construction |
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| Affiliation: | 1. Pavilion Technologies/A Rockwell Automation Company, 10415 Morado Circle, Bldg. III, Suite 100, Austin, TX 78759, USA;2. Zachry Department of Civil Engineering, Texas A&M University, MS 3136, College Station, TX 77843-3136, USA;3. Texas Transportation Institute, Texas A&M University, MS 3135, College Station, TX 77843-3135, USA;1. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China;2. Shanghai Key Laboratory for Digital Maintenance of Buildings and Infrastructure, Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing, 100190, China;2. University of Chinese Academy of Sciences, Beijing, 100049, China;1. Faculty of Civil Engineering, Universiti Teknologi MARA, Cawangan Pulau Pinang, Malaysia;2. Faculty of Civil Engineering, Universiti Teknologi MARA, Shah Alam, Malaysia;3. Institute of Infrastructure and Sustainable, Engineering and Management (IIESM), Universiti Teknologi MARA, Shah Alam, Malaysia;1. School of Environmental and Materials Engineering, Yantai University, Yantai City, China;2. School of Materials Science and Engineering, Chongqing University, Chongqing City, China;1. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China;2. College of Environmental Science and Engineering, Nankai University, Tianjin, China;3. Department of Civil Engineering, Queen’s University, 58 University Ave., Kingston, ON K7L 3N6, Canada;4. Department of Manufacturing and Civil Engineering, Norwegian University of Science and Technology (NTNU), 2815 Gjøvik, Norway |
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| Abstract: | The presented paper investigates the potential for the utilization of unprocessed, as excavated (i.e. unground), stockpiled coal combustion fluidized bed ash in road base course construction. In addition to functioning as a stabilizer of the fines in the stockpiled material, this ash also permits treating the stockpiled ash agglomerates as an aggregate. Both untreated and cement-treated mix designs were evaluated. The laboratory program included unconfined strength measurements, triaxial, volumetric swell, and moisture susceptibility testing protocols performed on cylindrical specimens compacted at their optimum moisture content.The results have shown that, without breaking down the agglomerates by grinding, the unstabilized stockpiled ash possesses very little residual cementitious activity; whereas, if treated with small amounts of cement (3%), it meets the required strength criteria for cement-treated base courses while minimizing the volumetric swell characteristics. |
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