Experimental and numerical study on the microstructure and chloride ion transport behavior of concrete-to-concrete interface

Xia, Jin; Chen, Keyu; Hu, Shuting; Chen, Jiejing; Wu, Ren-jie; Jin, Weiliang

doi:10.1016/j.conbuildmat.2023.130317

Cited by 15 publications

(6 citation statements)

References 43 publications

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“…of the staged pouring concrete and spreading to both sides of the concrete [22]. With the increase in immersion time, the chloride ion concentration at the same depth increases to varying degrees, showing an overall increasing trend with the increase in casting interval, and the chloride ion concentration at the bonding interface of the staged pouring concrete is higher than that on both sides.…”

Section: Effect Of Pouring Interval Time On Chloride Ion Concentratio...mentioning

confidence: 89%

“…As the casting interval increases, the deterioration of the bonding interface gradually expands, affecting the surrounding concrete on both sides, resulting in an increase in chloride ion concentration. This is due to the combined effect of chloride ions diffusing along the bonding interface of the staged pouring concrete and spreading to both sides of the concrete [22]. With the increase in immersion time, the chloride ion concentration at the same depth increases to varying degrees, showing an overall increasing trend with the increase in casting interval, and the chloride ion concentration at the bonding interface of the staged pouring concrete is higher than that on both sides.…”

Section: Effect Of Pouring Interval Time On Chloride Ion Concentratio...mentioning

confidence: 95%

“…In addition to mechanical properties, during long-term service, staged pouring concrete with layered pouring interfaces often experiences more severe durability problems caused by chloride ion ingress compared to ordinary concrete [11,[20][21][22]. Shen et al [21] analyzed the scanning electron microscope images of the transition zone at layered interfaces of staged pouring concrete and the hydration process, revealing the presence of numerous microcracks and voids at the layered interfaces, resulting in lower density in the transition zone, which adversely affects the properties of the concrete matrix.…”

Section: Introductionmentioning

confidence: 99%

“…Shen et al [21] analyzed the scanning electron microscope images of the transition zone at layered interfaces of staged pouring concrete and the hydration process, revealing the presence of numerous microcracks and voids at the layered interfaces, resulting in lower density in the transition zone, which adversely affects the properties of the concrete matrix. Xia et al [22] investigated the chloride ion transport behavior of staged pouring concrete and found the presence of microcracks and a large amount of CaCO 3 in the pouring interface zone, with higher porosity than the concrete matrix on both sides, leading to deeper chloride ion diffusion into the concrete matrix. Zhang et al [23], through ultrasonic non-destructive testing and rapid chloride ion migration (RCM) tests, studied the interface bonding performance and chloride ion diffusion resistance of staged pouring concrete, indicating that with increasing pouring interval time, the difference in chloride ion diffusion between the new concrete area and the old concrete area becomes more pronounced.…”

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: Effect Of Pouring Interval Time On Chloride Ion Concentratio...mentioning

confidence: 89%

Section: Effect Of Pouring Interval Time On Chloride Ion Concentratio...mentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…The empty space in these cases is discretized in a network with pores and throats as well as their tortuosities (SHEN and CHEN, 2007;TRANTER et al, 2019;THIBODEAUX, SHENG and THOMPSON, 2015). Studying the microstructure of concrete with electron microscopy (XIA et al, 2023) can be performed with known techniques such as Scanning Electron Microscopy (SEM) and X-Ray Diffraction (XRD) among other existing ones that should be used depending on the pore size (DA SILVA, 2023;PADHY et al, 2007;HAIDE, FEST-SANTINI and SANTINI, 2022;SING, 2001). In the determination of surface area with adsorption-desorption techniques, known as the Brunauer, Emmett, Teller (BET) technique and Mercury Intrusion Porosimetry (MIP) (DA SILVA, 2023;PADHY et al, 2007;HAIDE, FEST-SANTINI and SANTINI, 2022;SING, 2001).…”

Section: Introductionmentioning

confidence: 99%

Diffusion coefficient and tortuosity: Brownian Motion

Da Silva,

Mazer

2023

CLCS

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The objective of this research is to determine the chloride ion diffusion through Brownian motion using images. The research also aims at the search for diffusional physical tortuosity due to Brownian motion to understand the transport flow of the chloride ion. Through micro-CT scanned images of concrete samples, a 3D reconstruction is performed for the representative element and define its microscopic properties. The implementation of the Brownian motion of the chloride ion particles in the porous network of the representative element considered the initial diffusion coefficient defined by the Stokes-Einstein equation. The diffusion coefficient is an important parameter for predicting the depth of attack of the chloride ion and its displacement due to Brownian motion helps to define the tortuosity of this diffusive transport. The research used computational modeling with MATLAB® software. The results show diffusion due to Brownian motion and tortuousness.

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Chloride transport through the interface in repaired marine concrete systems in a cracked state

Zhou,

Lu,

et al. 2024

Structural Concrete

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In repaired marine concrete structures, generally, an interface exists between old and new concrete, however, the influence of this interface on durability has yet not been well understood. In this study 18 reinforced concrete beams with new‐to‐old concrete interfaces (N–O interfaces) were designed to investigate chloride transport through a cracked interface. The effects of crack widths at the interface, concrete strain, and the chloride exposure time were considered, respectively. Results showed that the N–O interfaces having crack widths between 0 and 0.13 mm posed no significant impact on the chloride transport in the depth direction of the N–O interfaces, however when the crack width exceeded 0.13 mm, the chloride concentration gradually increased as the crack width increased. Chloride transport through the horizontal direction of the N–O interface was different between new and old concrete matrix when the crack width reached 0.18–0.20 mm. The surface layer with a range of 5–10 mm depth of concrete was sensitive to the variation of concrete strain, and the evolution of chloride concentration with concrete strain presented a logarithm relationship. Within the exposure period between 60 and 90 days, the increasing rate of chloride concentration was higher than that between 30 and 60 days. The study can provide some recommendations for repair of concrete elements exposed to a chloride‐laden exposure environment.

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Experimental and numerical study on the microstructure and chloride ion transport behavior of concrete-to-concrete interface

Cited by 15 publications

References 43 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

Diffusion coefficient and tortuosity: Brownian Motion

Chloride transport through the interface in repaired marine concrete systems in a cracked state

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