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.