SYMPOSIA PAPER Published: 01 January 1994

Test Method for Evaluating Pavement Sealants Under Simultaneous Cyclic Shear and Normal Deflections


A new method to evaluate the performance of sealants, used in rigid pavement joints, was developed. A special fixture was designed to transfer cyclic in-line deflection, applied by a testing machine, to simultaneous cyclic normal and shear deflections, at a specific ratio, on a sealant sandwiched between two-51 mm portland cement mortar cubes. The developed fixture was used to evaluate the performance of three commercially available one-component sealant types (A, B, and C): A is a low modulus silicone, B is a self leveling silicone, while C is a polyurethane used with primer.

The sealants were evaluated under both cyclic compression/shear and tension/shear tests at 25 Hz. Each sealant was evaluated at two joint widths, 6.5 mm and 19 mm. Analysis of test results indicated that sealant C performed the best with no failure after 500,000 cycles in all tests, while the performance of sealant B was the worst with cohesive failure in most cases. Sealant A, on the other hand, failed adhesively at a joint width of 6.5 mm. All sealants, not surprisingly, performed better in cyclic compression/shear than in cyclic tension/shear.

Author Information

Al-Qadi, IL
Virginia Polytechnic Institute and State University, Blacksburg, VA
Abo-Qudais, SA
Virginia Polytechnic Institute and State University, Blacksburg, VA
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Developed by Committee: C24
Pages: 85–94
DOI: 10.1520/STP14002S
ISBN-EB: 978-0-8031-5289-2
ISBN-13: 978-0-8031-1993-2