Bahia, Hussain U.

Bahia, H.U. Critical Evaluation of Asphalt Modification Using the SHRP Concepts, In Transportation Research Record 1488, TRB, National Research Council, Washington, D.C., 1995, pp. 82-88.
Bahia. H.U, and Anderson, D.A. "The New Proposed Rheological Properties: Why are They Required and How They Compare to Conventional Properties," In Transportation Research Record 1488, TRB, National Research Council, Washington, D.C., 1995, pp. 32-39.
Bahia, H.U., and Davies, R. Factors Controlling the Effect of Crumb Rubber on Critical Properties of Asphalt Binders, Journal of the Association of Asphalt Paving Technologists, Vol. 64, 1995, pp. 130-162.
Bahia, H. U. and Anderson, D.A. "The Pressure Aging Vessel (PAV): A Test to Simulate Rheological Changes Due to Field Aging," Physical Properties of Asphalt Cement Binders: ASTM STP 1241, John C. Harden, Ed. American Society for Testing and Materials, 1994, (pp. 52-67).
Bahia, H.U. and Anderson, D.A. "Glass Transition Behavior and Physical Hardening of Asphalt Binders," Journal of the Association of Asphalt Paving Technologists, Vol. 62, 1993, pp. 93-129.
Bahia, H.U., Anderson, D.A., and Christensen, D. "The Bending Beam Rheometer; A Simple Device for Measuring Low Temperature Rheology of Asphalt Binders," Journal of the Association of Asphalt Paving Technologists, Vol. 61, 1992, pp. 117-153.
Christensen, D.W., Bahia, H.U., and Anderson, D.A., Physical Properties of Asphalt Cement and Their Relation to Microstructural Model, Accepted for presentation and publication at the Association of Asphalt Paving Technologies Annual Meeting in March 1996.
Bahia , H.U., Davies, R., and Martinez V., Recycling of Scrap Tires and Plastic Waste in Modification of Asphalt Binders, Accepted for presentation at the Transportation Congress of the American Society of Civil Engineers, October 22-26, 1995, San Diego, CA. Also, published in the Proceedings.
Bahia, H.U. and Anderson, D.A. "Physical Hardening of Asphalt Binders and Relation to Compositional Parameters," Preprints of the 204th American Chemical Society (ACS) national meeting, Division of Fuel Chemistry, Vol. 37, No.3 and 4, 1992.
Bahia, H.U. and Anderson, D.A. "Low-Temperature Physical Hardening of Asphalt Cements," Proceeding of the International Symposium for Chemistry of Bitumen, Rome (Italy),June 5-8, 1991.

Summary

My research and teaching focus is on characterization of construction materials with emphasis on rheology and durability of asphalt binders and asphalt concrete mixtures. Adequate material characterization and prediction of materials behavior play an important role in the successful design and construction of structures. Highway pavements are a unique class of structures that combines the complexity of the main construction materials (soils, portland cement and asphalt). Because more than 90% of highways in the United States, and many other countries, are built with asphalts, the knowledge of asphalt technology is essential to many engineers that deal with building of highways.

One of the main challenges in asphalt technology is the use of rheological principles to characterize the visco-elastic properties of this material that are related to pavement performance. The testing systems required to measure these properties and the methods by which we can use these properties to improve pavement performance are under development. In 1987, the United State Congress authorized a national research program named the Strategic Highway Research Program (SHRP). The results of the SHRP asphalt research program is a new system called Superpave. Superpave is an integrated system that includes materials testing methods, mixture design procedures, mixture behavior analysis, and pavement performance prediction. It is expected that Superpave will be the system used by Users and Producers of highway materials to select materials and design pavements. The State Departments of Transportation have started the implementation of Superpave this year and are expected to fully adopt Superpave by Year 2000.

In 1993 the Civil and Environmental Engineering Department of UW-Madison started looking at this new technology. In September of 1996, a new laboratory was opened for testing of asphalt materials. The new laboratory, established by funds from the University and the Industry in Wisconsin, includes a full set of Superpave testing equipment for asphalt binders. It also includes a full set of equipment for mixture volumetric design, and part of the mixture analysis and performance prediction systems. Examples of the main systems are Dynamic Shear Rheometers, Bending Beam Rheometer, Direct Tension Test Device, Gyratory Compactor, Indirect Tension Test Device for Mixtures, and asphalt Extraction and Recovery.

The current asphalt program at UW-Madison includes 4 faculty members, 3 Ph.D. students, 4 M.S. students, and 4 undergraduate engineers from the CEE department.

There are four courses that focus on Pavement Materials and design offered at the CEE department at the undergraduate and graduate levels.

(1) CEE 575: Advanced Highway Materials and Construction,
(2) CEE 576: Advanced Pavement Design,
(3) CEE 698: Advanced Bituminous Materials Testing and Construction,
(4) CEE 395: Materials For Constructed Facilities.

The following are the main funded research projects being conducted currently by the asphalt group. They are funded by federal and state agencies.
(1)Investigation of Modified Asphalt Performance Using SHRP Binder Specifications.
Sponsored by the Wisconsin Department of Transportation.
Research Partners: Asphalt Institute.
(2)Asphalt Stabilization of Manufactured Gas Plant Soils.
Sponsored by the Wisconsin Power and Light Company.
(3)NCHRP 10-39A Testing and Inspection Levels for Hot-Mix Asphaltic Concrete Overlays.
Sponsored by the National Cooperative Highway Research Program. (NCHRP)
Research Partners: Asphalt Institute.
(4)NCHRP 9-10 Superpave Protocols for Modified Asphalt Binders.
Sponsored by the National Cooperative Highway Research Program (NCHRP).
Research Partners: Asphalt Institute, National Center for Asphalt Technology, and the Canadian National Research Council.
(5)National SHRP Asphalt Training CenterII, Superpave Training and Technical Assistance."
Sponsored by the Federal Highway Administration (FHWA).
Research Partners: Asphalt Institute, University of Texas at Austin, and Heritage Research Group.

The following are some of the on-going research projects that are not funded.
(1) Evaluation of Strain Distribution Within Asphalt Direct Tension Specimen Using Reflective Lazer Extensiometer.
(2) Comparison of Loading Patterns Used In Asphalt Bending Beam Rheometers.
(3) The Use of Micromechanics to Predict Asphalt Mixture Critical Rheological Properties.
(4) Critical Evaluation of Asphalt-Filler Mastic Rheological Behavior at Typical Pavement Temperatures.
(5) Automation and Optimization of Asphalt Paving Operations Using Computer Simulations and Global Positioning Systems (GPS) .

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Date last modified: 17-Aug-2006
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