Sustainable Construction Case History: Fly Ash Stabilization of Recycled Asphalt Pavement Material |
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| Authors: | Lin Li Craig H Benson Tuncer B Edil Bulent Hatipoglu |
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| Institution: | (1) Department of Civil and Environmental Engineering, Jackson State University, P.O. Box 17068, Jackson, MS 39217, USA;(2) Department of Civil and Environmental Engineering, University of Wisconsin-Madison, 1415 Engineering Drive, Madison, WI 53706, USA |
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| Abstract: | A case history is described where Class C fly ash was used to stabilize recycled pavement material (RPM) during construction
of a flexible pavement in Waseca, MN, USA. The project consisted of pulverizing the existing hot-mix asphalt (HMA), base,
and subgrade to a depth of 300 mm to form RPM, blending the RPM with fly ash (10% by dry weight) and water, compacting the
RPM, and placement of a new HMA surface. California bearing ratio (CBR), resilient modulus (Mr), and unconfined compression (qu) tests were conducted on the RPM alone and the fly ash stabilized RPM (SRPM) prepared in the field and laboratory to evaluate
how addition of fly ash improved the strength and stiffness. After 7 days of curing, SRPM prepared in the laboratory had CBR
ranging between 70 and 94, Mr between 78 and 119 MPa, and qu between 284 and 454 kPa, whereas the RPM alone had CBR between 3 and 17 and Mr between 46 and 50 MPa. Lower CBR, Mr, and qu were obtained for SRPM mixed in the field relative to the SRPM mixed in the laboratory (64% lower for CBR, 25% lower for
Mr, and 50% lower for qu). In situ falling weight deflectometer testing conducted 1 year after construction showed no degradation in the modulus of
the SRPM, even though the SRPM underwent a freeze–thaw cycle. Analysis of leachate collected in the lysimeter showed that
concentrations of all trace elements were below USEPA maximum contaminant levels. |
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| Keywords: | Fly ash Industrial byproducts Sustainable construction Recycled asphalt Flexible pavement Falling weight deflectometer Stiffness Leaching |
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