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Evaluation of Load Transfer Restoration Techniques and Undersealing Practices
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1986-05-01
[PDF-1.42 MB]
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Abstract:This report presents results of an investigation conducted to evaluate the performance of "retrofit" load transfer devices installed at a test site on I-75 in Georgia. Devices installed include dowel bars placed in slots and Double V devices placed in holes drilled along joints. Measured deflection data at the test site are compared with deflections calculated using a modified version of computer program JSLAB. The modified version of the program allows calculation of deflections of loaded slabs that are initially curled upward. Calculated results indicate that there is no clear difference in calculated responses of joints using retrofitted dowel bars and Double V devices. However, field deflection data and visual observations of test sections indicate that sections retrofitted with dowel bars are generally performing better than sections retrofitted with Double V devices. Poor performance of some of the test sections using the Double V devices is attributed to field problems encountered with use of the patching materials. These problems may preclude achievement of desirable level of performance with Double V devices. Retrofitted dowel bars can be expected to provide a desirable level of long-term performance when used with commonly available patching materials. The report also presents a synthesis of State DOT practices on undersealing of concrete pavements. Items discussed include void detection, grout materials and properties, grouting equipment, and grouting procedure. Data from Illinois and New York on performance of undersealed sections are also presented. Illinois data indicate that improvement in deflection response is obtained with undersealing only when initial deflections are high. The New York data showed that undersealing is not effective in eliminating faulting if the causative factors, especially lack of load transfer, are not eliminated. Therefore, undersealing by itself does not solve the problem of pumping and faulting. Steps must be taken to restore load transfer at joints and to eliminate saturated subbase/subgrade condition by providing effective drainage and positive joint sealing.
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