Quantification of nano-crystalline C-S-H in hydrated tricalcium silicate, Portland cement and fly ash cement using PONKCS method
Year: 2025
Type: article
Abstract: X-ray powder diffraction (XRD) was used to characterize and quantify nano-crystalline C-S-H in hydrated tricalcium silicate (C 3 S), Portland cement, and siliceous fly ash blended cement using Rietveld analysis with partial or no known crystal structure (PONKCS) coupled with thermalgravimetric analysis (TGA). Calibration of the C-S-H profile was carried out by minimizing bound water content detected by TGA and XRD using least square minimization. Validation of the results was achieved by independent methods such as TGA and mass balance calculation. The PONKCS analysis provided acceptable accuracy of the C-S-H content. H 2 O content in C-S-H was derived based on the C-S-H content and bound water. Comparison of the extracted profile showed that the C-S-H crystallinity increased with an increase in Ca/Si atomic ratio. The full phase assemblage of the hydrated samples was obtained. Challenges in applying PONKCS method in C-S-H determination were discussed.
Source: Cement and Concrete Research
Authors: Xuerun Li, Karen L. Scrivener
Institution: École Polytechnique Fédérale de Lausanne
Language: English
Subfield: Civil and Structural Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $5,180
OpenAlex ID: W4407673491