Effect of Graphene and Carbon Fiber on Repairing Crack of Concrete by Electrodeposition

Abstract

For many years, researches have investigated concrete repair technologies including epoxy resin injection technology, bioremediation technology and self-healing technology. However, these repair methods have proven to be expensive and cumbersome to be carry out. A more recent technology electrochemical deposition, the focus of this paper emphases in a new way of healing concrete cracks that restores durability and mechanical strength of a concrete structure. Therefore, the emphasis of the research work reported here in is to prove the repair efficiency of the electrodeposition method by adding carbon fiber and graphene to the concrete. By analyzing the mass change of the concrete, total charge passed, crack width variation, ultrasonic waves, sediment composition and morphology, it was found that the cracks with width of 0.3-0.5 mm in samples healed within 20 days. The repair efficiency of samples mixed with carbon fiber and graphene were better than specimens without carbon fiber and graphene. Moreover, the mass increase rate of a concrete samples mixed with carbon fiber and graphene was 10.15 ‰, which is twice the mass of conventional concrete. The results of SEM and X-ray diffraction analysis showed that the samples mixed with carbon fiber and graphene produced more ZnO and that had a continuous compact structure.

Recent Progress of Cement-Based Materials Modified by Graphene and Its Derivatives

“…In addition, graphene materials’ excellent electrical and thermal conductivity provides new possibilities for crack control and self-healing of concrete, as shown in Figure 6 . Yang [ 85 ] took the internal structure of the reinforced concrete in seawater as the cathode and the platinum electrode as the anode. By using hybrid graphene materials, the electrochemical deposition efficiency is enhanced.…”

Mechanical–transport–chemical modeling of electrochemical repair methods for corrosion‐induced cracking in marine concrete

“…It can be seen that crack closure rates calculated by the mechanical-transport-chemical model are in good agreement with experimental results. The crack closure rate is F I G U R E 8 A comparison between the closure pattern of crack with 0.5 mm width in Yang et al (2019) experimental data and numerical results over 3 weeks faster in the first 5 days and gradually becomes slower. This decreasing crack closure rate can be explained by two reasons.…”

“…The comparison of crack closure patterns from the calculated results to the experiment by Yang et al (2019) is shown in Figure 8. In their experiment, only the cracked surface was exposed in an electrolyte, while the other five surfaces are sealed with resin.…”

“…In this section, the experimental results of two studies (Chu et al., 2017; Yang, 2019) are compared with the mechanical–transport–chemical model to verify the crack closure rate and crack closure pattern. Parameters used in the abovementioned experiments are shown in Table 4.…”

“…A comparison between the closure pattern of crack with 0.5 mm width in Yang et al. (2019) experimental data and numerical results over 3 weeks…”