[30590] Artykuł: Changes in the structure of hardened cement paste due to high temperature(Zmiany struktury stwardniałego zaczynu cementowego wywołane wysoką temperaturą)Czasopismo: Materiaux et Construction Tom: 17, Zeszyt: 100, Strony: 291-296 ISSN: 1359-5997 Opublikowano: 1984 Autorzy / Redaktorzy / Twórcy
Grupa MNiSW: Publikacja w czasopismach wymienionych w wykazie ministra MNiSzW (część A) Punkty MNiSW: 0 |
Abstract
The investigation performed was aimed at explaining explaining experimentally the changes occurring in the microstructure and phase composition of cement pastes during their exposure to heat in the temperature range 20–800°C. The investigation was performed by means of the following methods; thermal analysis, X-ray diffraction analysis, infrared spectroscopy analysis and mercury porosimetry. During the investigation observations were made regarding the behaviour of the following phases in pastes exposed to heat: Ca(OH)2, CaCO3, C−S−H, non-evaporable water and micropores.
From an analysis of the experimental results, temperature ranges of the following changes were determined in the structure of the investigated paste: additional hydration of unhydrared cement grains, recrystallization and carbonization of Ca(OH)2, deformation and transformation of C−S−H phases, non-linear changes in the distribution of pore diameters and total porosity.