Direct Shear and Direct Tension Bond Assessment between Ultra-High Performance Concrete and Normal Strength Concrete
Publication: Tran-SET 2022
ABSTRACT
This study assesses the effects of substrate surface preparation on ultra-high performance concrete (UHPC) overlay bond. Bond assessment is important because effectiveness of an overlay greatly depends on overlay-substrate bond. Bond was assessed by subjecting overlaid specimens with five substrate surface moisture conditions (excess free moisture, a thin layer of free moisture, air-dried saturated surface-dry (SSD), towel dried SSD, or dry) and five substrate surface textures (smooth and brush, light, medium, and heavy sandblasted) to direct tension and direct shear tests. All surface textures facilitated adequate shear strengths when there was free moisture on the surface. In general, bond strength improved with aggregate exposure as long as the substrate was visibly moist (SSD or wetter) at UHPC overlay placement. The primary conclusion was that visibly moist exposed aggregate surfaces facilitated acceptable bond [greater than 1.03 MPa (150 psi) for tension and 1.00 MPa (145 psi) for shear].
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Tran-SET 2022
Pages: 45 - 55
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Published online: Dec 13, 2022
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