Fiber’s Interfacial Bond Strength Analysis using Direct Tensile Loading Tests

摘要

This study presents an analytic approach for predicting the direct tensile bond strength of recycled plastic fiber reinforced hot-mix asphalt (HMA) mixtures. The toughening effects of the recycled plastic fiber-reinforced HMA mixtures were characterized using the direct tensile loading test developed here. The direct tensile loading approach is based on a law that separates the composite stress of the mixture into the matrix and fiber stress components. A method for calculating the effective fiber volume fraction along the failure plane is proposed to estimate the interfacial bond strength along the failure plane. The average interfacial bond strength resulted in the value of τ = 0.12 N/mm~2. Comparing to the maximum tensile stress at the peak of 0.47 N/mm~2, the fiber’s contribution to resisting the failure is approximately 25.5%. The interfacial bond strength could be predicted using this approach because of the composite mixture failure resulting from the failure of the fiber and matrix interfacial bond. The generality of the direct tensile loading approach was confirmed by the experimental data from the direct tensile tests and three-point bending beam tests.