Shear properties of epoxy polymer overlays on bridge decks

Laboratory shear test was used to evaluate the shear strength of epoxy polymer overlays on cement interfaces and to analyze the influence of factors such as shearing rate,temperature and membrane thickness on the shear strength. The result indicates that the shear strength rises in a power exponent law with the shearing rate increasing,but falls gradually with increasing temperature. In the experiment,the shear strength,when at 60℃,reaches its lowest point,but much higher than those of other road bonding materials. In a semi-logarithmic coordinate system,the shear strength is less affected by temperature,almost approaching a linear change,in comparison with bituminous materials. The shear strength firstly rises and then falls with increasing membrane thickness. The optimum membrane thickness of Mark-135 is 0.28 mm but 1.10 mm for Mark-163.