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0-6607-1 Report Abstract

September 5, 2013

The Overlay Tester:  A Sensitivity Study to Improve Repeatability and Minimize Variability in the Test Results

Lubinda F. Walubita, Abu N. Faruk, Gautam Das, Hossain A. Tanvir, Jun Zhang, and Tom Scullion, Texas A&M University, February 2012, 154 pp.

Hot mix asphalt (HMA) overlay is one of the most commonly used methods for rehabilitating deteriorated pavements. One major type of distress influencing the life of an overlay is reflective cracking. Many departments of transportation have implemented design-level tests to measure the rutting potential of HMA; these are typically wheel-tracking tests. However, currently, there is no national design-level test for measuring resistance to cracking. Currently, the Texas Department of Transportation uses the Overlay Tester (OT) to evaluate the cracking susceptibility of HMA mixes in the laboratory. While, the OT effectively simulates the reflective cracking mechanism of opening and closing of joints and/or cracks, repeatability and variability in the test results have been major areas of concern. In particular, variability in the OT test results poses a problem with most of the conventional dense-graded HMA mixes, such as Type C and D, which is approximately 75 percent of all the HMA used on Texas highways.

This laboratory study presents a comprehensive sensitivity evaluation of the critical steps of the OT test procedure in an attempt to optimize the OT repeatability and minimize variability in the test results. In general, the study indicated that the sample drying method, glue quantity, number of sample replicates, air voids, sample age at the time of testing, and temperature variations are some of the key aspects that have a significant impact on the OT test repeatability and variability. Overall, findings from this study indicate that variability in the OT test results can be minimized if these aspects are improved and/or more clearly specified in the OT test procedure (Tex-248-F).

Keywords: HMA, Cracking, Overlay Tester (OT), Peak Load, OT Cycles, Repeatability, Variability, Coefficient of Variation, Monotonic, Tensile Strength, Tensile Strain, Tensile Modulus, Fracture Energy (FE), FE Index, Pseudo Strain Energy, Air Voids, X-Ray CT

ENTIRE REPORT (Adobe Acrobat File – 4.1 MB)

60027-1 Report Abstract

January 15, 1992

The State-of-the-Art of Alternative Fuels: A Review and Annotated Bibliography of Theoretical, Empirical and Case Studies

Naomi W. Ledé and Mohammed Hamid, Texas Southern University, Houston, TX, 1992, 70 pp.

This annotated bibliography was compiled during the initial phases of the study designed to assess costs associated with fuel conversion projects in selected public transit systems. It is also the prelude to a relatively in-depth analysis of those energy-related projects that specifically address energy conservation and alternative fuel issues as well as technology transfer. In addition, this phase of the study provides comprehensive information for use by researchers in the field. It is designed to guide scholars whose interest are in applied research, and to aid transportation planners in their research and technology efforts to develop viable alternatives to transportation fuels currently in use.

Keywords: Methanol, Ethanol, Hydrogen, Liquid Natural Gas, Propane, Fuel Alternative, Alcohol, Vegetable Oils

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Reference Report #60027-1