Physical-chemical-mechanical quantitative assessment of the microstructural evolution in Portland-limestone cement pastes exposed to magnesium sulfate attack at low temperature

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378297%3A_____%2F21%3A00545256" target="_blank" >RIV/68378297:_____/21:00545256 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216224:14740/21:00124437

Výsledek na webu

<a href="https://doi.org/10.1016/j.cemconres.2021.106566" target="_blank" >https://doi.org/10.1016/j.cemconres.2021.106566</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.cemconres.2021.106566" target="_blank" >10.1016/j.cemconres.2021.106566</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Physical-chemical-mechanical quantitative assessment of the microstructural evolution in Portland-limestone cement pastes exposed to magnesium sulfate attack at low temperature

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Physical-chemical-mechanical quantitative assessment of the microstructural evolution in Portland-limestone cement pastes exposed to magnesium sulfate attack at low temperature

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

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

2021

Kód důvěrnosti údajů

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

Název periodika

Cement and Concrete Research

ISSN

0008-8846

e-ISSN

1873-3948

Svazek periodika

149

Číslo periodika v rámci svazku

November

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

16

Strana od-do

106566

Kód UT WoS článku

000713249700008

EID výsledku v databázi Scopus

2-s2.0-85112420927