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@article{1842604, author = {Sotiriadis, K. and Hlobil, M. and Viani, A. and Macova, P. and Vopalensky, M.}, article_location = {OXFORD}, article_number = {NOV}, doi = {http://dx.doi.org/10.1016/j.cemconres.2021.106566}, keywords = {Thaumasite sulfate attack; X-ray micro-computed tomography; Solid state NMR spectroscopy; Nanoindentation; Thermodynamic modelling}, language = {eng}, issn = {0008-8846}, journal = {Cement and Concrete Research}, title = {Physical-chemical-mechanical quantitative assessment of the microstructural evolution in Portland-limestone cement pastes exposed to magnesium sulfate attack at low temperature}, url = {https://www.sciencedirect.com/science/article/pii/S0008884621002155?via%3Dihub}, volume = {149}, year = {2021} }
TY - JOUR ID - 1842604 AU - Sotiriadis, K. - Hlobil, M. - Viani, A. - Macova, P. - Vopalensky, M. PY - 2021 TI - Physical-chemical-mechanical quantitative assessment of the microstructural evolution in Portland-limestone cement pastes exposed to magnesium sulfate attack at low temperature JF - Cement and Concrete Research VL - 149 IS - NOV SP - 106566 EP - 106566 PB - Elsevier Ltd SN - 00088846 KW - Thaumasite sulfate attack KW - X-ray micro-computed tomography KW - Solid state NMR spectroscopy KW - Nanoindentation KW - Thermodynamic modelling UR - https://www.sciencedirect.com/science/article/pii/S0008884621002155?via%3Dihub N2 - 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. ER -
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. \textit{Cement and Concrete Research}. OXFORD: Elsevier Ltd, 2021, roč.~149, NOV, s.~106566-106581. ISSN~0008-8846. Dostupné z: https://dx.doi.org/10.1016/j.cemconres.2021.106566.
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