Calibration of grayscale values of cement constituents using industrial X-ray tomography

Wan, Keshu; Chen, LingYan; Xu, Qian

doi:10.1007/s11431-014-5751-6

Cited by 9 publications

(4 citation statements)

References 28 publications

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“…In contrast, the cracked sample contained three phases: (1) a gas phase including cracks and empty microcapsules; (2) a liquid phase of intact microcapsule core materials; (3) a solid phase including cement-bentonite matrix and the precipitated sodium silicate that was released from the microcapsules. However, the linear attenuation coefficients of the gas phase and liquid core phase are very close, both of which appear as black in the cracked sample, making it difficult to isolate one from the other (Wan et al, 2015;Ahmed, 2015;Lv et al, 2016). No major cracks can be observed around the shell of microcapsules in the undamaged specimen, indicating that the microcapsules survived the mixing process and no premature release of sodium silicate occurred.…”

Section: Micro-ct Imaging Analysismentioning

confidence: 99%

The first microcapsule-based self-healing cement–bentonite cut-off wall materials

et al. 2023

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Despite the extensive use of cement-bentonite in contaminated land containment applications, there are still many challenges related to their durability.Developing self-healing cement-bentonite materials could provide more resilient, sustainable and reliable cut-off walls with significantly enhanced durability, reduced maintenance costs, enhanced safety and protection against sudden or undetected failure.The objective of this study was to develop self-healing cement-bentonite cut-off wall materials incorporating microcapsules. Microencapsulated sodium silicate, as a healing agent, would be released into cracks when the microcapsules rupture as a result of incurred damage, and reacts with the cement-bentonite matrix to fill and heal the cracks.Novel microcapsules with switchable mechanical properties developed for self-healing cement applications were employed here. The results demonstrated the enhanced average crack mouth healing and recovered permeability performance provided by the microcapsules compared to control cement-bentonite samples. X-ray microcomputed tomography and scanning electron microscopy were applied to investigate the selfhealing process of the microcapsule-containing cement-bentonite system. The microstructural analysis confirmed the survivability, uniform dispersion and cracktriggered rupture of the microcapsules, as well as the release of the healing agent and the generation of hydration products within the cracks. These are promising results for the application of the microcapsule-based system for self-healing cement-bentonite cutoff wall materials.

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Section: Micro-ct Imaging Analysismentioning

confidence: 99%

The first microcapsule-based self-healing cement–bentonite cut-off wall materials

et al. 2023

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“…While the development of this technique has been mainly driven by its invaluable use in medical diagnostics [9], it is also a useful tool for nondestructive inspection of building materials [10,11]. In particular, it has been shown that the technique is suitable for identifying the different components of cement-based materials [12,13], and that the technique can be used to visualize the material changes associated with cement degradation through leaching [14]. In previous work, it was determined that X-ray computed tomography may indeed provide a detailed description of AC pipe degradation [15].…”

Section: Introductionmentioning

confidence: 99%

CT Scans of Asbestos Cement Pipes as a Reference for Condition Assessment of Water Mains

Laarhoven

Steen

Hulst

et al. 2021

Water

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The water distribution network of The Netherlands contains around 30,000 km of asbestos cement (AC) pipes, which constitutes around 25% of the total network. As a pipe material, AC has a relatively poor performance, and therefore is a high priority for renewal. To help decide an effective order of replacement, the water utilities need condition assessment techniques that help them determine which pipes have the highest risk of failure. In the presented work, X-ray computed tomography (CT) was used to measure the degradation of AC pipes taken out of the field. These scans provide a description of the pipe degradation with unmatched detail. The results are compared with strength tests performed on the same pipes, revealing that detailed knowledge of the complete pipe degradation is more important than previously assumed. Moreover, comparison of the CT results to those of a commercial, non-destructive inspection technique was used as a new avenue for validation of this technique, demonstrating its future usefulness for attaining the detailed measurement of pipe degradation required by water utilities.

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“…While the development of this technique has been mainly driven by its invaluable use in medical diagnostics, it is also a useful tool for the non-destructive inspection of building materials. In particular, it has been shown that the technique is suitable for identifying the different components of cement-based materials [3,4] and that the technique can be used to visualize the material changes associated with cement degradation through leaching [5]. CT should therefore prove to be a valuable tool to provide a more detailed view of AC pipe degradation.…”

Section: Introductionmentioning

confidence: 99%

CT Scans of Asbestos Cement Pipes to Support the Development of Better Condition Assessments

Laarhoven

Quintiliani

2020

The 4th EWaS International Conference: Valuing the Water, Carbon, Ecological Footprints of Human Activities

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The Dutch drinking water distribution network consists roughly of 25% (around 30,000 km) asbestos cement pipes. This pipe material has a relatively high priority to be renewed and therefore received quite some attention when it comes to the development of condition assessments that help water utility experts to prioritize which of these pipes to replace first. In the presented work, X-ray computed tomography (CT) was used to measure the degradation of the asbestos cement (AC) pipes taken out of the field. The CT scans provide a highly detailed view of the pipe degradation. The insight provided by these images poses several questions with respect to some of the core assumptions of the condition models currently in use. Moreover, the comparison of CT results to those of non-destructive, in-line inspection techniques will provide a new avenue for the validation of these techniques and their usefulness for the Dutch water utilities.

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Calibration of grayscale values of cement constituents using industrial X-ray tomography

Cited by 9 publications

References 28 publications

The first microcapsule-based self-healing cement–bentonite cut-off wall materials

The first microcapsule-based self-healing cement–bentonite cut-off wall materials

CT Scans of Asbestos Cement Pipes as a Reference for Condition Assessment of Water Mains

CT Scans of Asbestos Cement Pipes to Support the Development of Better Condition Assessments

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