Characterization of Substrate-to-Overlay Interface Bond in Concrete Repairs: A Review

Manawadu, Ayumi; Qiao, Pizhong; Wen, Haifang

doi:10.1016/j.conbuildmat.2023.130828

Cited by 35 publications

(8 citation statements)

References 100 publications

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“…Figure 6 illustrates the compressive strength test results of the staged pouring concrete. In contrast to numerous existing research findings [8,12,18,36], the compressive strength of the staged pouring concrete specimens in this study decreased first and then increased with the increasing pouring interval time. Specifically, when the pouring interval time was less than the initial setting time (12.5 h), the compressive strength of the staged pouring concrete decreased with the increasing pouring interval time, consistent with the trend observed in the split tensile strength, mainly due to the decrease in interfacial bonding strength [10,37].…”

Section: Compressive Strengthcontrasting

confidence: 99%

“…Generally, the mechanical properties of staged pouring concrete are lower compared to ordinary concrete [8]. The interlayer bonding performance determines the overall performance of staged pouring concrete, and factors such as concrete rheological properties, temperature, relative humidity, pouring interval time, and admixtures can affect the interlayer bonding performance of staged pouring concrete [12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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The Mechanical Properties and Chlorine Resistance of Concrete Based on the Effects of Pouring Interval Time

Chen,

Huang,

Wei

et al. 2024

Buildings

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In practical engineering construction, differences in time intervals during concrete pouring arise due to issues in concrete quality control and construction procedures, thereby affecting the mechanical and durability properties of concrete. This study conducted compressive strength tests, splitting tensile strength tests, and natural immersion tests to investigate the influence of time intervals in layered pouring on the mechanical strength and chloride ion concentration distribution of staged pouring concrete. Additionally, the study elucidated the mechanism by which pouring interval time affects the mechanical properties and resistance to chloride ion erosion of staged pouring concrete at the microstructure level. The results indicate that compared to ordinary concrete specimens, the splitting tensile strength of staged pouring concrete demonstrates a continuous decrease with increasing pouring interval time. The most significant splitting tensile strength decrease occurred at a 24 h interval. The compressive strength of staged pouring concrete initially decreases and then increases with increasing pouring interval time. At a pouring interval time of 12 h, the compressive strength of staged pouring concrete decreased the most. Results from the natural immersion tests demonstrate that chloride ion concentrations at the bonding interface and on both sides of staged pouring concrete increase continuously with the extension of pouring interval time. The chloride ion concentration at the bonding interface is consistently higher than that on both sides, and the difference between them decreases with increasing diffusion depth. The chloride ion concentration difference ΔC was proposed to evaluate the influence of bonding interface performance on chloride ion concentration, which decreases to varying degrees with increasing depth. The findings of this study can provide guidance for the research on the mechanical properties and durability of staged pouring concrete in practical engineering construction, as well as for engineering protective measures.

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Section: Compressive Strengthcontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Mechanical Properties and Chlorine Resistance of Concrete Based on the Effects of Pouring Interval Time

Chen,

Huang,

Wei

et al. 2024

Buildings

View full text Add to dashboard Cite

show abstract

“…In this study, as the sensing coating is cement paste, while not directly tested, it can be assumed that its elastic modulus [166] would be lower than that of the concrete substrate [114,171]. Based on the existing literature [172][173][174][175], having a coating with a lower elastic modulus than the substrate could result in cracking and delamination of the coating. To counter these issues, we would need to ensure an adequate bond between the two materials and a sufficient coating thickness to resist cracking.…”

Section: Electromechanical Testingmentioning

confidence: 99%

Strain Monitoring of Concrete Using Carbon Black-Based Smart Coatings

Milone,

Vlachakis,

Tulliani

et al. 2024

Materials

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Given the challenges we face of an ageing infrastructure and insufficient maintenance, there is a critical shift towards preventive and predictive maintenance in construction. Self-sensing cement-based materials have drawn interest in this sector due to their high monitoring performance and durability compared to electronic sensors. While bulk applications have been well-discussed within this field, several challenges exist in their implementation for practical applications, such as poor workability and high manufacturing costs at larger volumes. This paper discusses the development of smart carbon-based cementitious coatings for strain monitoring of concrete substrates under flexural loading. This work presents a physical, electrical, and electromechanical investigation of sensing coatings with varying carbon black (CB) concentrations along with the geometric optimisation of the sensor design. The optimal strain-sensing performance, 55.5 ± 2.7, was obtained for coatings with 2 wt% of conductive filler, 3 mm thickness, and a gauge length of 60 mm. The results demonstrate the potential of applying smart coatings with carbon black addition for concrete strain monitoring.

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“…Cracks in reinforced concrete (RC) structures weaken the bonding interface between reinforcement and concrete, provide new corrosion paths for external corrosives such as liquid water, CO 2 , water ions, chloride ions, sulfates, etc, and at the same time corrosion products exert stresses within the concrete, further facilitate the generation and expansion of cracks [5][6][7]. The development of cracks influences the fracture behavior of concrete and degrades the mechanical properties of a structure [8]. These cracks influence the strength, stability, integrity and impermeability of concrete structures, significantly reduce the load-bearing capacity and ultimate strength of concrete structures [9,10].…”

Section: Introductionmentioning

confidence: 99%

Monitoring of crack repair in concrete using spherical smart aggregates based on electromechanical impedance (EMI) technique

Lan,

Liu,

Zhuang

et al. 2024

Smart Mater. Struct.

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Cracks will inevitably occur in concrete structures or members during the construction process and service life due to aging, environmental factors, external loads, etc. To improve the strength and stability of the cracked concrete structures, many methods have been proposed to repair the cracks. However, the monitoring of the repairing process and repair quality has not been fully studied. The previous studies have proved that the SSAs based on the electromechanical impedance (EMI) technique have outperformed the traditional SAs based on the EMI technique in structural health monitoring of civil structures, however, SSAs have not been applied to the monitoring of the concrete crack repair. In this work, the monitoring of the concrete crack repair using the SSAs based on the EMI technique was explored. A total of 8 valid concrete specimens were prepared, and cracks in the concrete specimens were simulated by manually cutting under laboratory conditions. According to the principle of grouting method, two repair agents including cement paste and cement mortar were used to repair the cracks. The impedance signals of 28 days were measured, and three quantitative indicators root mean square deviation (RMSD), mean absolute percentage deviation (MAPD), and correlation coefficient deviation (CCD) were used to evaluate the quality of the concrete repair effect. The results indicate that the SSAs show excellent sensitivity and stability over the traditional SAs. In addition, the normalization values of the quantitative indicators were analyzed to distinguish the types of repair agents. A mathematical expression of exponential function was also proposed by fitting the experimental data to quantitatively evaluate and predict the repair effect of concrete cracks.

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Characterization of Substrate-to-Overlay Interface Bond in Concrete Repairs: A Review

Cited by 35 publications

References 100 publications

The Mechanical Properties and Chlorine Resistance of Concrete Based on the Effects of Pouring Interval Time

The Mechanical Properties and Chlorine Resistance of Concrete Based on the Effects of Pouring Interval Time

Strain Monitoring of Concrete Using Carbon Black-Based Smart Coatings

Monitoring of crack repair in concrete using spherical smart aggregates based on electromechanical impedance (EMI) technique

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