2026-06-01T04:36:16Zhttps://riuma.uma.es/rest/oai/requestoai:riuma.uma.es:10630/325122026-05-29T12:16:32Zcom_10630_2254col_10630_37959
RIUMA. Repositorio Institucional de la Universidad de Málaga
author
Shirani, Shiva
author
Cuesta-García, Ana María
author
Díaz, Ana
author
Trtik, Pavel
author
Holler, Mirko
author
Rack, Alexander
author
Lukic, Bratislav
author
Brun, Emmanuel
author
García-Aranda, Miguel Ángel
2024-09-10T11:42:00Z
2024-09-10T11:42:00Z
2024
https://hdl.handle.net/10630/32512
Portland cements are environmentally contentious, accounting for ≈8% of the anthropogenic CO2 emissions. The understanding of the cement hydration reactions (dissolution and precipitation processes) is important to contribute to develop cements with lower CO2 footprints.
We are pushing 4D (3D+time) cement hydration nanoimaging within a multiscale framework. Full-field laboratory X-ray micro Computer Tomography (μCT) is widely used to study cement hydration but the best spatial resolution is about 2 μm for a Field of View (FoV) of ≈1×2 mm (H×V) with polychromatic measurements taking hours. Moreover, the contrast between the different components is poor. Full-field propagation-based phase-contrast synchrotron X-ray μCT can study similar FoVs ≈1×2 mm with better spatial resolution, ≈0.50 μm. The monochromatic measurements are fast, i.e. 5-10 minutes. Unfortunately, the contrast is only slightly better. Cement hydration can be studied with much better contrast and spatial resolution by scanning near-field ptychographic nano-computed tomography (nCT). In this case the FoV could be ≈200×30 μm with spatial resolution, close to 250 nm, and excellent component contrast. Even air and water can be differentiated. However, these nCTs takes about 3-4 hours in optimized beamlines (BL) at third generation synchrotrons.
We will present here our latest 4D nanoimaging results (Shirani et al. (2023) Nature Comm. 14:2652) from data
eng
Cemento Portland
Cristalografía por rayos
Sistemas de imágenes
Tomografía
4D nanoimaging of Portland cement hydration.
conference output
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URL
https://riuma.uma.es/bitstreams/8a70df02-d489-48f2-8ca2-e26cb58af705/download
File
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c96006ee335ad2309fa85f43fb8a6930
148581
application/pdf
4D nanoimaging AUSE - abstract_Aranda.pdf