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Performance of a Fly Ash Stabilized Pavement

Published online by Cambridge University Press:  21 February 2011

Joakim G. Laguros  and
Curt Hayes
Joakim G. Laguros
Affiliation:
School of Civil Engg. and Environmental Science, The Univ. of Oklahoma, Norman, OK, 73019
Curt Hayes
Affiliation:
Oklahoma Department of Transportation, Oklahoma City, OK 73105
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Abstract

An expansive shale roadbase, stabilized with a Class C (high-calcium) fly ash received an 11–inch full–depth asphaltic concrete surface layer and the highway was opened to traffic six years ago. Periodic sampling and visual observations indicate that the performance of the pavement test sections are above average.

Analyses of field samples showed that fly ash was effective in ameliorating the texture and plasticity of the shale and imparting strength to it on a long term basis. Pavement deflections and the extent of cracking have not increased beyond acceptable levels during the six year period.

X-ray diffraction studies show a reduction of the areas under the peaks and the SEM observations reveal a dense degree of packing and reduction of the void areas. These modifications occur during the first two years of service and any changes beyond that period appear to be minor.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 178: Symposium W – Fly Ash and Coal Conversion By-Products VI , 1989 , 235
Copyright
Copyright © Materials Research Society 1990

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References

1. Laguros, J.G. and Keshawarz, M.S. in Fly Ash and Coal Conversion By-Products: Characterization-Utilization and Disposal II, Mat. Res. Soc. Symp. Proc. Vol.65, edited by McCarthy, G.J., Glasser, F.P. and Roy, D.M. (Materials Research Society, Pittsburgh, 1986) pp. 37–46.Google Scholar
2. American Association of State Highway and Transportation Officials, Standard Specifications for Transportation Materials and Methods of Sampling and Testing, AASHTO Designation: M-145-73, 13th ed., Washington, D.C., 1982.Google Scholar
3. Laguros, J.G. and Medhani, R. in Proc. 2nd Int. Conf. on Ash Technology (CEGB, London, 1984) pp. 500–504.Google Scholar
4. Zenieris, P.E. and Laguros, J.G. in Fly Ash and Coal Conversion By-Products: Characterization-Utilization and Disposal V, Mat. Res. Soc. Symp. Proc. Vol.136, edited by Hemmings, R.T., Berry, E.E., McCarthy, G.J., and Glasser, F.P. (Materials Research Society, Pittsburgh, 1989) pp. 207–222.Google Scholar
5. American Association of State Highway and Transportation Officials, Standard Specifications for Transportation Materials and Methods of Sampling and Testing, AASHTO Designation: T88–86, 14th ed., Washington, D.C., 1986.Google Scholar