This study investigates the evolution of internal damage in fresh cement mortar over 25 hours of hardening using in-situ time-lapse X-ray computed micro-tomography (μXCT) imaging. The key highlights and insights are:
In-situ μXCT scanning was used to detect and capture the evolution of internal damage (cracks) in cement mortar during the hydration process.
Temperature measurements during cement mortar hardening were compared with an analytical model, showing relatively good agreement with the experimental data.
The μXCT data allowed for quantified characterization of the porous space and the crack growth inside the meso-structure, including its volume and surface characteristics.
The results provide valuable insights into cement mortar shrinkage and serve as a proof-of-concept methodology for future material characterization.
The observed crack growth was linked to the onset of the second phase of cement hydration, where a rapid increase in crack size was detected during the first 4 hours.
After 6 hours, the crack growth stopped, indicating that the majority of the damage occurred during the early stages of hydration.
The diagonal crack growth pattern was attributed to uneven temperature profiles produced by the cement hydration and the X-ray source during the CT data acquisition.
Overall, the study demonstrates the potential of in-situ μXCT imaging for characterizing the evolution of internal damage in fresh cementitious materials, providing valuable insights into the underlying processes governing cement mortar behavior.
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by Petr... às arxiv.org 10-01-2024
https://arxiv.org/pdf/2401.11988.pdfPerguntas Mais Profundas