Evaluation of an Experimental Portland Cement Concrete Pavement Project

Concrete pavement has been utilized in every state due to its durability. However, the pavements constructed in the last 10 to 20 years appear to be less durable than those constructed previously. The only properties normally targeted are strength and air content. These two factors alone cannot guarantee durability in PCC pavement. The properties currently targeted are found using what is known as a "recipe." There is need to change the design philosophy and look at other properties besides strength and air. The objective is to move toward an end result specification for concrete paving by moving away from "recipe" mixes to a mix design philosophy with target properties. The scope was to construct an experimental recycled portland cement concrete pavement. The experimental pavement was broken up into test sections with each having different design parameters. Individual items to be evaluated over the long term are as follows: distresses in the pavement, overall pavement condition, ride, and long term compressive strength. The project will be evaluated for a period of ten-years with reports every two years. The location of the project is on Interstate 29 in the southbound lane from reference point 163 to 175. This section of the roadway is located approximately 22 miles north of Grand Forks, ND. Test Sections 1 and 2 are exhibiting some minor corner cracking. All test sections are experiencing some aggregate pop-outs. Test Sections 2 and 3 are exhibiting very little distress of any type. After the third evaluation, all of the test sections are performing well. The tining, although light in Test Section 2 and 3 appears to be performing well. The ride characteristics for all test sections remain excellent.