United States Department of Transportation
i
Evaluation of joint sealant materials : interim report No. 1.
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1972-03-01
[PDF-10.97 MB]
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Abstract:This report illustrates some of the problems caused by ineffectively sealed joints and points to the great need for properly sealing joints in both concrete pavements and structures.
The principles of design including slab lengths, joint dimensions and joint formation as well as the projected effects of debris, traffic and the environment have been reconsidered and re-evaluated. Recent changes in pavement design have led to the use of 20 foot panel lengths and 7/16 inch width joints sealed with a 13/16 inch compression seal. Bridge joints are armored, with the joint width dependent upon predicted movement. These predicted movements are now being actually checked to improve the accuracy of prediction.
The asphaltic based materials, asphalt cement with mineral filler, rubberized asphalt and "improved" rubberized asphalt, are the materials that were extensively used in the past for sealing joints. These materials have been found to possess physical properties which are sufficiently effective in a laboratory environment; but in the field, the majority of the results have been disappointing. However, if techniques for accepting installations could be established, some of these products could be used. The neoprene compression seals have been effective on both the roadways and bridges, and are the only sealants now specified for joints exhibiting movement.
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