Quantification of Microstructural Changes in Limestone Cement Paste Stored in Sulfate Environment at Low Temperature

Konstantinos Sotiriadis; Michal Hlobil; Dita Machová; Petra Mácová; Alberto Viani; Michal Vopálenský

doi:10.4028/www.scientific.net/SSP.309.3

Paper Titles

Quantification of Microstructural Changes in Limestone Cement Paste Stored in Sulfate Environment at Low Temperature
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Determination of Concrete Resistance to Corrosive Effects of Water with Aggressive CO₂ Using Model Mortars
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Comparison of Resistance of Concrete for Sewage Pipes to Sulphate Corrosion Using Model Mortars
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HomeSolid State PhenomenaSolid State Phenomena Vol. 309Quantification of Microstructural Changes in...

Quantification of Microstructural Changes in Limestone Cement Paste Stored in Sulfate Environment at Low Temperature

Abstract:

Portland-limestone cement paste specimens were stored in magnesium sulfate solution at 5°C for 6 months; the occurring microstructural changes have been monitored on a monthly basis. Extent of deterioration was quantitatively assessed with different techniques. The X-ray micro-computed tomography was employed to describe non-invasively the pore structure and extend of deterioration. X-ray powder diffraction and infrared spectroscopy were used to characterize the phase changes occurred in the course of the sulfate attack. Compressive strength tests reflected the effect of the process on mechanical performance. The results indicate the rapid degradation of the system, owing, mainly, to crack formation, expansion, and finally loss of cohesion between the deteriorated parts of the specimens and the sound cement matrix, as a consequence of the formation of new phases. The progress of an irregular deterioration front was observed. The presence of complex phases (thaumasite, ettringite) was proved, however, the deteriorated parts of the specimens mostly consisted of gypsum.

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Periodical:

Solid State Phenomena (Volume 309)

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3-7

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.309.3

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Online since:

August 2020

Authors:

Konstantinos Sotiriadis*, Michal Hlobil, Dita Machová, Petra Mácová, Alberto Viani, Michal Vopálenský

Keywords:

Limestone Cement, Microstructure, Sulfates, X-Ray Tomography

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