Resilient Moduli Response of Moderately Cement-Treated Reclaimed Asphalt Pavement Aggregates
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VIEW THE ORIGINAL ARTICLEPublication: Journal of Materials in Civil Engineering
Volume 23, Issue 7
Abstract
The use of reclaimed asphalt pavement (RAP) aggregate materials in road construction reduces natural resource depletion and promotes the recycling of RAP materials for other applications. However, product variability and low resilient moduli characteristics often limit RAP applications in road bases. Stabilization of RAP materials with cement was hence attempted in a research study to evaluate the effectiveness of cement treatments in enhancing resilient characteristics of RAP aggregates. The present paper describes the results from a series of resilient modulus tests that were conducted in a laboratory environment using a repeated load triaxial test setup. The effects of three different cement dosages and various confining and deviatoric stress levels on the resilient modulus () response of treated RAP materials were studied. values of untreated and cement-treated RAP aggregates ranged from 180 to 340 MPa and 200 to 515 MPa, respectively, which reveal the enhancements with cement treatment. Regression modeling analyses of test results, by using two- and three-parameter models, are also presented. The analyses show that both models are reasonably capable of capturing the effects of stress levels on treated RAP resilient properties. Test results were also analyzed to determine structural coefficients for pavement design purposes, which ranged from 0.16 to 0.22, suggesting a greater structural support of cement-treated RAP layers when compared with untreated aggregates.
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Acknowledgments
We acknowledge Texas Industries (TXI, Inc.), Dallas for the financial support to this research. We also would like to acknowledge Messrs. Fred Brouillette, Dan Richwine, and Cliff Ryan of TXI for their interest and support to this research.
References
AASHTO. (1999). “Determining the resilient modulus of soils and aggregate materials.” T-307-99, TS-1a.
Fang-Le, P., and Jian-Zhong, L. (2004). “Modeling of state parameter and hardening function for granular materials.” J. Central South Univ. Technol., 11(2), 176–179.
Gnanendran, C. T., and Woodburn, L. J. (2003). “Recycled aggregate for pavement construction and the influence of stabilization.” Proc., Conf. of the Australian Road Research Board, 21, 1755–1768.
Hoyos, L. R., Puppala, A. J., and Ordonez, C. A. (2011). “Characterization of cement fiber-treated reclaimed asphalt pavement aggregates: Preliminary investigation.” J. Mater. Civ. Eng., 23(7), 977–989.
Janoo, V. C. (1994). “Layer coefficients for NHDOT pavement materials.” Special Report 94-30, NHDOT and USDOT.
Lofti, H., and Witczak, M. W. (1985). “Dynamic characterization of cement-treated base and subbase materials.” Transp. Res. Rec., 1031, 41–48.
MacGregor, J. A. C., Highter, W. H., and DeGroot, D. J. (1999). “Structural numbers for reclaimed asphalt pavement base and subbase course mixes.” Transportation Research Record, 1687, 22–28.
Maher, M. H., Gucunski, N., and Papp, W. J., Jr. (1997). Recycled asphalt pavement as a base and sub-base material, ASTM Special Technical Publication, 1275, 42–53.
Mulheron, M., and O’Mahony, M. M. (1990). “Properties and performance of recycled aggregates.” Highw. Transp., 37(2), 35–37.
Potturi, A. (2006). “Evaluation of resilient modulus of cement and cement-fiber treated reclaimed asphalt pavement (RAP) aggregates.” Master’s thesis, The Univ. of Texas at Arlington, Arlington, TX.
Potturi, A., Puppala, A. J., and Hoyos, L. R. (2007). “Resilient characteristics of cement treated reclaimed asphalt pavement aggregates.” Proc., Transportation Research Board (TRB) Annual Meeting, National Research Council, National Academy of Science, Washington, DC, January.
Puppala, A. J., Mohammad, L. N., and Allen, A. (1997). “Engineering behavior of lime treated Louisiana subgrade soil.” Transportation Research Record 1546, Transportation Research Board, National Academy of Science, Washington, DC, 24–31.
Rana, A. S. M. A. (2004). “Evaluation of recycled material performance in highway applications and optimization of their use.” Ph.D. dissertation, Texas Tech Univ., Lubbock, TX, 170.
Sebesta, S., and Scullion, T. (2004). “Effectiveness of minimizing reflective cracking in cement treated bases by microcracking.” Rep. No. FHWA/TX-05/0-4502-1, Texas Transportation Institute, College Station, TX, 110.
Taha, R., Al-Harthy, A., Al-Shamsi, K., and Al-Zubeidi, M. (2002). “Cement stabilization of reclaimed asphalt pavement aggregate for road bases and subbases.” J. Mater. Civ. Eng., 14(3), 239–245.
Texas Department of Transportation (TxDOT). (2011). “Laboratory compaction characteristics and moisture-density relationships of base materials.” Tex-113-E, Austin, TX.
TxDOT. (1999). “Soil cement testing.” Tex-120-E, Austin, TX.
Wilburn, D. R., and Goonam, T. G. (1998). “Aggregates from natural and recycled sources: Economic assessments for construction applications-a materials flow analysis.” USGS Circular, 1176.
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Published In
Journal of Materials in Civil Engineering
Volume 23 • Issue 7 • July 2011
Pages: 990 - 998
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Dec 17, 2009
Accepted: Jan 7, 2011
Published online: Jan 10, 2011
Published in print: Jul 1, 2011
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