Using X-ray computed tomography to investigate mortar subjected to freeze-thaw cycles

Sokhansefat, Ghazal; Moradian, Masoud; Finnell, Mark; Behravan, Amir; Ley, M. Tyler; Lucero, Catherine; Weiss, Jason

doi:10.1016/j.cemconcomp.2020.103520

Cited by 36 publications

(9 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This method is able to provide a detection accuracy of one tenth of a voxel but it requires a reference image acquired under identical imaging conditions to the cracked image. X-ray µCT has been used to image cracks induced by drying [36], freeze-thaw actions [37][38][39], carbonation [40] and leaching [41]. Nevertheless, most of these studies performed only qualitative assessments or basic measurements of the microcracks.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of autogenous shrinkage-induced microcracks in concrete from 3D images

Mac

Yio

Wong

et al. 2021

Cement and Concrete Research

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

“…volume fraction, connectivity and diffusion tortuosity), but no attempt was made to separate microcracks from the connected pores and air voids. Several studies [38,39,46] have proposed methods for isolating microcracks, but these are applicable only to diffuse (< 0.1% vol. fraction), isolated and morphologically simple microcracks.…”

Section: Introductionmentioning

confidence: 99%

Analysis of autogenous shrinkage-induced microcracks in concrete from 3D images

Mac

Yio

Wong

et al. 2021

Cement and Concrete Research

View full text Add to dashboard Cite

“…Different types of cement-based mortars respond in a distinctively different manner to this condition. The complex phenomena in action can only be investigated using microstructural damage detection techniques, such as optical microscopy, scanning electron microscopy (SEM), or X-ray computed tomography (XCT) [ 22 ]. In this work, the interpretation of the test results is restricted to a phenomenological approach.…”

Section: Discussionmentioning

confidence: 99%

Residual TRM-to-Concrete Bond after Freeze–Thaw Cycles

Askouni

Papanicolaou

2021

Materials

View full text Add to dashboard Cite

In the present work, the effect of various freeze–thaw cycles (namely, 0, 10, 30, 50, 60, and 70) on the residual bond characteristics of textile reinforced mortar (TRM)-to-concrete was experimentally examined. The TRM consisted of a carbon dry fiber textile embedded in a cement-based matrix. Two mortar types were used as the matrix: a normal-weight and a lightweight one sharing the same hydraulic powders but different aggregates (limestone and pumice sand, respectively). The single-lap/single-prism set up was applied after the specimens underwent hygro-thermal treatment (according to ASTM C 666-Procedure B). Failure was due to the sleeve fibers rupturing the load aligned yarns or textile slippage from the mortar for an exposure period ranging between 0 and 60 cycles and to TRM debonding from the substrate for 70 cycles. Increasing cycles resulted in the intensification of partial interlaminar debonding phenomena and the weakening of the textile-to-matrix bond, with lightweight mortar being more prone to these effects. In the absence of a commonly accepted standardized method for the assessment of the freeze–thaw resistance of cement-based composites, the criterion for the termination of the freeze–thaw sequence was the number of cycles inferring a shift in failure mode (from fiber rupture/fiber slippage to TRM debonding from the substrate).

show abstract

“…Argandoña et al [16] and Liu et al [17] studied the damage and deterioration characteristics of rocks under freeze-thaw times using computed tomography tests. G. Sokhansefat et al [18] studied the crack propagation of cement mortar under freeze-thaw by X-ray computed microtomography. Some scholars [19][20][21] have conducted freeze-thaw tests on sandstone and studied the pore development of rock after freeze-thaw times by NMR.…”

Section: Introductionmentioning

confidence: 99%

Mechanism Analysis of the Influence of Freeze-Thaw on the Damage and Debonding Evolution of Sandstone-Concrete Interface

et al. 2022

View full text Add to dashboard Cite

During tunnel construction in cold regions, the good adhesion of surrounding rock-lining interface is one of the important preconditions to evaluate the durability of tunnel lining. However, the repeated fatigue damage between rock and concrete due to the freeze-thaw action leads to debonding at the interface, which significantly affects the protective effect of shotcrete. Accordingly, based on the combination of sandstone-concrete as the object, through the development of sandstone-concrete interface freeze-thaw cycling test, and combining the nuclear magnetic resonance (NMR) test and scanning electron microscopy (SEM) analysis, the mechanism of debonding by freeze-thaw damage at the sandstone-concrete interface was systematically revealed. The conclusions drawn are as follows: (1) With the increase of freeze-thaw times, the content of micropores and macropores at the interface gradually increases, while the content of mesoporous gradually decreases. At the same time, the decrease of freeze-thaw temperature also aggravates the growth of interface cracks, and the freeze-thaw damage of interface is closely related to the minimum freeze-thaw temperature. (2) The damage of the sandstone side becomes more serious under multiple freeze-thaw actions. Concrete as a water retaining plate inhibits the migration of water to its interior, and a pot cover effect exists at the interface to provide better storage space for water accumulation. (3) The C-S-H group is the main source of the bond force of sandstone-concrete interface, and the freeze-thaw effect aggravates the fracture of the C-S-H group, which leads to the interface debonding. This study could provide an experimental basis and theoretical support for systematically recognizing the evolution mechanism of freeze-thaw damage and debonding of shotcrete in tunnels in cold regions.

show abstract

Using X-ray computed tomography to investigate mortar subjected to freeze-thaw cycles

Cited by 36 publications

References 44 publications

Analysis of autogenous shrinkage-induced microcracks in concrete from 3D images

Analysis of autogenous shrinkage-induced microcracks in concrete from 3D images

Residual TRM-to-Concrete Bond after Freeze–Thaw Cycles

Mechanism Analysis of the Influence of Freeze-Thaw on the Damage and Debonding Evolution of Sandstone-Concrete Interface

Contact Info

Product

Resources

About