Experimental and Analytical Investigation of Crack Spacing and Width for Overlaid RC Beams at Elevated Temperatures

Abstract

Cracking in overlay-strengthened RC structures significantly influences their structural performance; however, the effect of elevated temperatures on cracking behavior remains

Practical Prediction Models of Tensile Strength and Reinforcement-Concrete Bond Strength of Low-Calcium Fly Ash Geopolymer Concrete

“…The crack width w can be obtained from the crack spacing, as it is the tensile extension difference between the reinforcement and the concrete within the crack spacing [41]. Considering that the tensile strain of concrete is very small, the crack width can be derived from Equation (41). w = σ s E s S cr (41) where σ s = stress in the reinforcement at a cracked section, E s = modulus of elasticity of the reinforcement.…”

“…Considering that the tensile strain of concrete is very small, the crack width can be derived from Equation (41). w = σ s E s S cr (41) where σ s = stress in the reinforcement at a cracked section, E s = modulus of elasticity of the reinforcement.…”

Revisiting Cracking in Reinforced Concrete Beams: An Updated Analysis

“…Considering the crack spacing, by this time (the 1990s), many parameters were considered: the concrete cover c [8,9,[11][12][13], and/or the bar spacing [8,9,[11][12][13], and/or the steel stress σs [11], and/or the concrete properties (compressive strength f c , tensile strength f ct , elastic modulus E c ) [7,14,15], and/or the bond stress σ b [7,14,15], and/or the bond properties (if high bond bars or plain surface) [8], and/or the bar diameter φ [7][8][9]11,12,14], and/or the effective reinforcement ratio ρ eff (determined in an effective area of concrete in tension surrounding the reinforcement) [7][8][9]14,15], and/or coefficient which takes account of the distribution of strain (if bending or pure tension) [8]. In general, all models were derived from knowledge of RC elements subject to pure tension.…”

C-FRCM Jacket Confinement for RC Columns under Impressed Current Cathodic Protection

“…Concrete is the most widely used building material in the world. However, reinforced concrete (RC) structures might face durability problems (Zhang et al 2017a;Li et al 2019), most of which are caused by the corrosion of steel rebars induced by chloride ions (Mehta 1991). The influence of steel corrosion on an RC structure has the following aspects: First, rusting causes the steel volume to expand, causing the concrete to crack (Rodriguez et al 1994); Second, when a rebar is corroded, the cross-sectional area of the rebar is reduced (Ahmad 2003); Third, the bonding performance of rebar and concrete is decreased by the corrosion (Fang et al 2006).…”