SOTIRIADIS, K., M. HLOBIL, A. VIANI, P. MACOVA a M. VOPALENSKY. Physical-chemical-mechanical quantitative assessment of the microstructural evolution in Portland-limestone cement pastes exposed to magnesium sulfate attack at low temperature. Cement and Concrete Research. OXFORD: Elsevier Ltd, roč. 149, NOV, s. 106566-106581. ISSN 0008-8846. doi:10.1016/j.cemconres.2021.106566. 2021.
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Základní údaje
Originální název Physical-chemical-mechanical quantitative assessment of the microstructural evolution in Portland-limestone cement pastes exposed to magnesium sulfate attack at low temperature
Autoři SOTIRIADIS, K., M. HLOBIL, A. VIANI, P. MACOVA a M. VOPALENSKY.
Vydání Cement and Concrete Research, OXFORD, Elsevier Ltd, 2021, 0008-8846.
Další údaje
Originální jazyk angličtina
Typ výsledku Článek v odborném periodiku
Obor 20500 2.5 Materials engineering
Stát vydavatele Velká Británie a Severní Irsko
Utajení není předmětem státního či obchodního tajemství
WWW URL
Impakt faktor Impact factor: 11.958
Kód RIV RIV/00216224:14740/21:00124437
Organizační jednotka Středoevropský technologický institut
Doi http://dx.doi.org/10.1016/j.cemconres.2021.106566
UT WoS 000713249700008
Klíčová slova anglicky Thaumasite sulfate attack; X-ray micro-computed tomography; Solid state NMR spectroscopy; Nanoindentation; Thermodynamic modelling
Štítky CF NMR, ne MU, rivok
Příznaky Mezinárodní význam, Recenzováno
Změnil Změnila: Mgr. Pavla Foltynová, Ph.D., učo 106624. Změněno: 23. 3. 2022 11:54.
Anotace
The changes in structural integrity and microstructure of Portland-limestone cement pastes were investigated in the course of magnesium sulfate attack at low temperature. A deterioration front, consisting of three distinct layers (brucite, gypsum, leached cement matrix), swelled in time due to the expansive nature of the deterioration products, generating cracks and subsequently detaching from the sound cement matrix, continuously promoting the process. Gypsum and thaumasite characterized the leached matrix, which experienced extensive cross-linking of the aluminosilicate structures, as a result of decalcification and dealumination of the calcium silicate hydrates (C-(A-)S-H), impairing the overall mechanical performance. C-S-H of low packing density was most severely affected by the process, as confirmed by the significant drop in nano-mechanical properties. The increased rate of deterioration with limestone content was tentatively attributed to the prevalent morphology of the C-S-H phase. Results were validated by thermodynamic simulations, indicating that the real systems did not reach equilibrium.
Návaznosti
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VytisknoutZobrazeno: 28. 3. 2024 13:04