Healing effectiveness of cracks rehabilitation in reinforced concrete using electrodeposition method

Abstract

An electrodeposition method and its experimental device for rehabilitation of cracks in reinforced concrete were proposed. Porous concrete is proposed to simulate cracked concrete, and mass increment, permeation coefficient and sound velocity of ultrasonic wave were used to be evaluating indicators of healing effectiveness of crack rehabilitation in this method. Effect of currency density, concentration of electrolyte solution on healing effectiveness of porous reinforced concretes with different total void ratio was studied. The experimental results indicate that the simulation of porous concrete for cracks can reflect the healing effectiveness of electrodeposition method effectively. Total void ratio of porous concrete has little effect on healing effectiveness of electrodeposition at early ages. The higher the currency density or concentration of electrolyte solution is, the higher the electrodeposition rate and sound velocity in porous concrete are, and the lower the permeation coefficient of porous concrete will be. Mg(OH) 2 crystals produced in high current density are large, thin sheet-shaped and arranged loosely.

Micromechanical framework for saturated concrete repaired by the electrochemical deposition method with interfacial transition zone effects

“…However, many experimental investigations have shown that there is interfacial transition zone (ITZ) between the deposition product and intrinsic concrete. Figure 1 shows the microstructures of ITZ according to Jiang et al (2004). The ITZ properties are influenced by many factors, such as the solution type and the current density (Chen, 2014;Chu and Jiang, 2009;Jiang et al, 2008;Otsuki and Ryu, 2001;Ryu, 2003b), which means that the perfect bonding assumption in our previous work is not reasonable all the time.…”

“…As a promising repairing approach for damaged concrete in aqueous environment, the electrochemical deposition method (EDM) has been applied to marine structures and other situations in which traditional repairing methods are limited (Jiang et al, 2015;Yokoda and Fukute, 1992). Over the past 20 years, many literatures have been published on EDM, which mainly focus on the experimental research, including regarding specimen production (Chang et al, 2009;Ryu, 2003a;Ryu and Otsuki, 2005), factors influencing the healing effectiveness of EDM (Chu and Jiang, 2009;Otsuki and Ryu, 2001;Ryu, 2003b) and assessments of the healing effectiveness of EDM (Chen, 2014;Jiang et al, 2008;Otsuki et al, 1999;Ryu and Otsuki, 2002). However, there are few theoretical models pertaining to mechanical properties during the damage-healing process.…”

A multiphase micromechanical model for unsaturated concrete repaired by electrochemical deposition method with the bonding effects

“…In the past 20 years, numerous experimental studies have been conducted on the electrochemical deposition method (EDM), which is a promising approach to repair the concrete cracks under an aqueous environment (Chen, 2014; Jiang et al., 2008; Ryu, 2003a; Ryu, 2003b; Ryu and Otsuki, 2002; Ryu and Otsuki, 2005). However, few studies have disclosed the healing mechanism of the EDM with the rigorous analytical models.…”

“…Most concrete structures repaired using the EDM are not fully saturated in reality (Chatterji, 2004; Persson, 1997). Meanwhile, the interface between the deposition products and the concrete is not always perfect bonding (Chen, 2014; Jiang et al., 2008). To incorporate these two phenomena, micromechanical framework is presented for unsaturated concrete repaired by EDM with the bonding effects based on our latest work (Chen et al., 2015a; Zhu et al., 2014).…”

An Improved Micromechanical Framework for Saturated Concrete Repaired by the Electrochemical Deposition Method considering the Imperfect Bonding

“…Over the past 20 years, many meaningful studies have been published on the electrochemical deposition method (EDM), which is a promising repairing approach for concrete in aqueous environment and has been applied to marine structures and other situations in which traditional repairing methods are limited [1][2][3][4]. The current literatures mainly focus on the experimental research, including specimen production [5][6][7], factors influencing the healing effectiveness of EDM [8][9][10], and assessments of the healing effectiveness of EDM [11][12][13][14]. However, there are few theoretical models pertaining to mechanical properties during the EDM healing process.…”