This report describes the results obtained from Experimental Ring No. 2, the first ring of a three-ring tests series on treated bases at the Washington State University Test Track. This experiment was concerned with studying the effects of controlled wheel load repetitions on untreated, emulsion, and special aggregate asphalt-treated bases of four varying thicknesses. Construction, instrumentation, results, and conclusions are described and drawn.
Benkelman beam, LVDT, strain gages, pressure cells and moisture tensiometers were used to measure deflections, strains, stresses and moisture. Maximum values are tabulated. Temperatures were also recorded.
Testing can be divided into two time periods - fall of 1966 and spring of 1967. Values obtained from instruments show that different conditions existed during those testing periods, and that deflections, strains and stresses were two to four times higher in the spring than in the fall. Modes of failure were also different.
Equivalencies between the different base materials were established. Other conclusions were drawn. Since this is a continuing experiment, it should be emphasized that results and conclusions are subject to change, depending upon data from the remaining experimental rings.
January 12, 2008
Milan Krukar, John C. Cook.
Washington State University. Highway Research Section.
- # of Pages: 148 p., 16,341 KB (PDF)
- Subject: Asphalt cement, Base course (Pavements), Benkelman beam, Circular test tracks, Deflection, Emulsions, Foundations, Gravel, Load cells, Pavement design, Pavement performance, Shear stress, Strain gages, Tensiometers, Wearing course (Pavements), Wheel loads.
- Keywords: Asphalt, base, condition, construction, data, experimental, materials, pavement, pressure, research, strains, stresses, temperature, test track, tests, volume, Washington State University.
- Related Publications: Pavement Research at the Washington State University Test Track, Volume One, Experimental Ring No. 1: A Study of Cement Treated and Asphaltic Treated Bases, (WA-RD 15.1).
Pavement Research at the Washington State University Test Track. Volume Three, Experimental Ring No. 3: A Study of Untreated, Emulsion Treated, and Asphaltic-Cement Treated Bases, (WA-RD 15.3).
Pavement Research at the Washington State University Test Track. Volume 4, Experimental Ring No. 4: A Study of Untreated, Sand Asphalt, and Asphalt Concrete Bases, (WA-RD 15.4).
Pavement Research at the Washington State University Test Track. Volume 5, Evaluation and Analysis of Results from Experimental Rings No. 1-4, (WA-RD 15.5).
Pavement Research at the Washington State University Test Track. Volume 6, The Application of the WSU Test Track Data to Flexible Pavement Design, (WA-RD 15.6).
This abstract was last modified April 29, 2008