Abstract
Adhesive strength of sealant was investigated by utilizing a new test setup developed from modification of Texas Overlay Test. Direct tension to sealant- asphalt concrete substrate was applied without any specialized sealant testing machine. Type I and Type IV (recommended for use in hot and cold climate respectively) sealants were tested at four temperatures on two different joint thicknesses. Type IV sealant fails in adhesion irrespective of temperature or thickness. Depending on the temperature, the failure pattern of Type I is cohesive or mix mode. A correlation between dynamic shear modulus of sealants and adhesive strength for both the sealants at each thickness were established with R2 values over 0.90. A general trend of the effect of thickness was observed and was explained by proposing a hypothesis that there exists a certain modulus for each sealant type at which the bond strength remains same irrespective of its thickness.
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