Performance of bond between carbon fiber-reinforced polymer sheets and thermally shocked damaged foam concrete

This research investigates the bond performance between Foam Concrete (FC) specimens damaged by thermal shock with Carbon Fiber Reinforced Polymer (CFRP) sheets. Additionally, the study provides novel insights into anchorage strategies for thermally damaged foam concrete, focusing on how concrete type and CFRP sheet dimensions influence bond strength. Two concrete mixes were used to cast 32 specimens with dimensions of (150 mm × 150 mm x 200 mm). Experimental results showed that the NWAC specimens outperformed the FC specimens by an average of 79.74 %, 89.91 %, 35.23 %, and 255.82 %, respectively, in terms of bond load, slippage, stiffness, and toughness. The bonded area of the CFRP sheet affected the bond behavior between the concrete and the sheet. Specimens with 15 cm CFRP sheet width showed increases of 38.90 %, 22.50 %, 31.39 %, and 70.88 %, in bond loads, slippage, stiffness, and toughness than the specimens with 10 cm CFRP sheet widths. Additionally, the specimens with a 20 cm CFRP sheet length outperformed those with a 14 cm CFRP sheet length by an average of 27.46 %, 56.44 %, 17.90 %, and 100.80 %, respectively, in these properties. Most of the tested specimens failed due to concrete separation or peeled-off concrete interfaces with different thicknesses of the concrete layer.