Laboratory Comparison of Crushed Aggregate and Recycled Pavement Material With and Without High Carbon Fly Ash |
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Authors: | Haifang Wen Justin Warner Tuncer Edil Gingan Wang |
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Institution: | (1) Department of Civil and Environmental Engineering, Washington State University, PO Box 642910, Spokane Street, Sloan Hall 35, Pullman, WA 99164-2910, USA;(2) Department of Civil and Environmental Engineering, University of Wisconsin at Madison, 1221 Engineering Hall, 1415 Engineering Drive, Madison, WI 53706-1691, USA;(3) Department of Civil and Environmental Engineering, University of Wisconsin at Madison, 2228 Engineering Hall, 1415 Engineering Drive, Madison, WI 53706-1691, USA |
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Abstract: | In-place recycling of asphalt pavement materials is a sustainable rehabilitation method. Existing hot-mix asphalt (HMA) layer
is pulverized and blended with some or the entire base course and possibly some subgrade to form a broadly graded material
referred to as recycled pavement material (RPM). The RPM is then compacted as the new base course and overlaid by a new layer
of HMA. In some occasions, additives are added to increase the strength of RPM base course, such as cement, emulsion, fly
ash. It is plausible to utilize high calcium high carbon fly ash, as the high level of carbon prevents fly ash from being
used in concrete. A series of laboratory tests were conducted to evaluate the performance of these materials, including crushed
aggregate, untreated RPM, and treated RPM with high carbon fly ash. The tests included compaction, California Bearing Ratio,
resilient modulus, and unconfined compressive strength for treated RPM. The engineering properties of these materials were
compared. |
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