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Laboratory Evaluation of Early Field Performance of Apical System

Description :  

This research test is the setup expected to simulate the shear loading in asphalt-polyurea interface in apical system in Eagan, MN. An asphalt brick sample having joint filled with tack coat, polyuria and top coat will be placed on a stone base. A rubber pad will cover the joint and a steel plate will be kept over the rubber pad. A cyclic loading will be applied on the polyuria through the steel plate and the load will be transmitted through the rubber pad. This loading will create a shear at the interface between polyuria and asphalt. The magnitude of the load will be 1000 lb so that it creates 100 psi pressure on the test sample surface. Frequency of loading will be reasonably selected (between 0.1 to 25 hz) to simulate the real wheel loading on the pavement. Temperature of the test sample will be varied from 140 degrees Fahrenheit to zero degrees Fahrenheit either by liquid nitrogen using the environmental chamber or by keeping the sample in the freezer. The sample will be subjected to a number of freeze thaw cycles. It is expected that the asphalt or the joint will fail due to the combined effect of freeze thaw cycle and the cyclic loading. Two strain gauges will be placed on both the sides of the joint, unloaded and loaded sides, to measure the strain due to cyclic loading and shear. Two-inch gauge length will be selected to compute strain and strain gauges will be located 0.5 in from the joints. Same test will be performed on asphalt sample without apical system.

Principal Investigator:  Wasiuddin, Nazimuddin  --  Civil Engineering
Funding Agencies:  CenturyLink
Amount Awarded:  24,523

Start Period:  00/00/0000 End Period:  00/00/0000
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November 16th, 2018

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