Quantification of microstructural changes in limestone cement paste stored in sulfate environment at low temperature

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378297%3A_____%2F20%3A00532112" target="_blank" >RIV/68378297:_____/20:00532112 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.4028/www.scientific.net/SSP.309.3" target="_blank" >https://doi.org/10.4028/www.scientific.net/SSP.309.3</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.4028/www.scientific.net/SSP.309.3" target="_blank" >10.4028/www.scientific.net/SSP.309.3</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Quantification of microstructural changes in limestone cement paste stored in sulfate environment at low temperature

Popis výsledku v původním jazyce

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 microcomputed 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.

Název v anglickém jazyce

Quantification of microstructural changes in limestone cement paste stored in sulfate environment at low temperature

Popis výsledku anglicky

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 microcomputed 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.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20501 - Materials engineering

Projekt

<a href="/cs/project/GJ18-26056Y" target="_blank" >GJ18-26056Y: Experimentální kvantifikace a modelování degradace směsných cementových past s příměsí vápence vlivem síranové koroze za vzniku thaumasitu</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Solid State Phenomena

ISBN

978-303571668-9

ISSN

1012-0394

e-ISSN

1662-9779

Počet stran výsledku

5

Strana od-do

3-7

Název nakladatele

Trans Tech Publications

Místo vydání

Baech

Místo konání akce

Hradec Králové

Datum konání akce

20. 11. 2019

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

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