Load Transfer Efficiency of Undoweled Jointed Concrete Pavement

The purpose of this research was to analyze the load transfer efficiency of undoweled jointed concrete pavement based on lean concrete layer through a series of FWD tests in field. The results are follows: The load transfer efficiency of the undoweled JCP is dependent on the slab temperature at the time of measuring rather than the age of pavement system, because of larger affect of aggregate interlocking which is heavily depended on the behavior of slab expansion and contraction. The load transfer efficiency of the doweled almost maintain 100% regardless to the variation of slab temperature. However, the load transfer efficiency of the undoweled showed very low values below 50% under the slab temperature of . The load transfer efficiency is very sensitivity to the slab temperature, thus, care should be taken at field survey. From the analysis of variance the pavement with/without dowel bars exert the most influential variable on the mean and standard deviation of load transfer efficiency at a confidential level around 90 at both of Chungbu highway and 88 highway, followed by FWD survey time and loading levels, sequently. The loading levels within the currently used in this survey didn't affect to the response at all. Thus, the dowel bar was necessary in order to keep load transfer efficiency high and to minimize the joint related distresses.