Moisture Effects on the Interfacial Shear Bond Strength of SCM Concretes
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To understand the effects of surface moisture and water content of supplementary cementitious material (SCM) concrete on interfacial strength, cylindrical overlay specimens were fabricated and shear bond strength was measured at the interface. Three different moisture conditions (air dry (AD), saturated surface dry (SSD), and wet) were chosen at the old concrete surface. Three w/c ratios (0.35, 0.45, and 0.55) were used to make overlay concrete with three different SCMs (class F fly ash, grade 100 slag, and silica fume). Shear test results show that the wet moisture condition resulted in low shear bond strength and most of AD condition resulted in high shear bond strength. SSD condition consistently developed high shear bond strength in SCM concrete mixtures. Overlay concrete with low w/c ratio resulted in high shear bond strength compared to that with high w/c ratio. Scanning Electron Microscope (SEM) and Energy-dispersive X-ray Spectroscopy (EDAX) were employed to characterize the cement paste at the interface. Calcium-silicate (C/S) ratio at the interface showed a fairly good relationship with shear bond strength, and the interfacial zone was identified at the interface of low shear bond strength.
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