Pull-out behaviour of steel fibres in cracked concrete under wet–dry cycles – deterioration phenomena

This paper presents an experimental investigation into the mechanisms altering pull-out behaviour of partially pulled hooked-end steel fibres inside artificial crack exposed to wet–dry cycles chlorides and carbon dioxide for 6 months. Mechanical corrosion damage at surface fibre was investigated using three-dimensional optical interferometric profiling, petrographic analyses were used describe healing processes matrix surrounding fibre. observed in cementitious fibre's confirmed that process governed by yielding fibre, fracture adjacent matrix, friction between hook matrix. Increases force pulled-out after exposure connected accumulation products from alteration cement study concluded autogenous carbonation damaged around are main responsible increase fibre–matrix bond strength bridging cracks concrete cycles.