INFLUENCE OF AMBIENT TEMPERATURE ON STIFFNESS OF ASPHALT PAVING MATERIALS
Main Article Content
Abstract
Asphalt pavement properties in Iraq are highly affected by elevated summer air temperatures. One of these properties is stiffness (resilient modulus). To explain the effect of air temperatures on stiffness of asphalt concrete, it is necessary to determine the distribution of temperatures through the pavement asphalt concrete layers. In this study, the distribution of pavement temperatures at three depths (2cm,7cm, 10cm) below the pavement surface is determined by using the temperature data logger instrument. A relationship for determining pavement temperature as related to depth and air temperature has been suggested. To achieve the objective of this thesis, the prepared specimens have been tested for indirect tension in accordance with ASTM D4123, using the pnuematic repeated load apparatus, in order to determine the values of resilient modulus at three different temperatures (10, 25, 40) °C. From results of testing, it is observed that the resilient modulus decreases with increase in test temperature by a rate of 8.78×10 Psi/C' for asphalt concrete wearing courses. An increase in optimum asphalt content by 0.1% (by weight of total mixture) causes a decrease in resilient modulus by 22% at a temperature of 40C". A statistical model for the prediction of resilient modulus has been developed depending on mixture variables of: asphalt content, asphalt hinder viscosity, surface area of combined aggregates, air voids of compacted mixture and test temperature.
Article Details
Section
How to Cite
References
Algibury, T. (2008). "Prediction of Resilient Modulus in Asphalt Paving Mixture", M.Sc. Thesis, Civil Engineering, University of Babylon.
Alkasawneh, W, E. Pan F. Han, R. Zhu and R. Green. Effect of temperature variation on pavement responses using 3D multilayered elastic analysis" Computer Modeling and Simulation Group, Department of Civil Engineering, The University of Fatani,
M.N., Al-Abdul Wahhab, H. I, Balghunaim, F. A., Bubshait, A., and Al- Dhubeeb. I. (1990). "Evaluation of permanent deformation Sci. and Technol. (KACST), Riyadh, Saudi Arabia.
Huang H. Yang. "Pavement Analysis and Design, University of Kentucky, 1993.
Ongel, A. and Hurvey, J., "Analysis of 30 years of pavement temperatures using the enhanced imegrated climate model (EICM)", Pavement Research Centre, University of California Davis 2004
Q Akron, Akron, OH 44325-3905, USA Ohio Department of Transportation, 1980 West Broad Street, Columbus, OH 43223, USA Interrational Journal of Pavement Engineering, Vol. 8, No. 3, September 2007, 203-212.
Diefenderfer, B. K.,I. L. Al-Qadi, S. D. Reubush and T. E. Freeman. "Development And Validation Of A model To Predict Pavement Temperature Profile". TRB(2003) Annual Meeting CD-ROM. of asphalt concrete pavement in Saudi Arabia." Progress Rep. No. 6 on Nat. Res. Project, King Abdulaziz City for
Strategic Highway Research Program, SHRP (1994), "The Superpave Mix Design Manual for New Construction and Overlays", SIRP-A-407, National Research Council, Washington, D. C..USA.
Witezak, M. (1972). "Design of Full Depth Air Field Pavement", Proceedings, Third International A Conference on the Structural Design of Asphalt Pavements, London.