Long-term sulfate resistance of synthesized cement systems with variable C₃A/C₄AF ratio at low temperature or ambient conditions: Insights into the crystalline and amorphous phase assemblage

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378297%3A_____%2F22%3A00559240" target="_blank" >RIV/68378297:_____/22:00559240 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.cemconres.2022.106902" target="_blank" >https://doi.org/10.1016/j.cemconres.2022.106902</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.cemconres.2022.106902" target="_blank" >10.1016/j.cemconres.2022.106902</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Long-term sulfate resistance of synthesized cement systems with variable C₃A/C₄AF ratio at low temperature or ambient conditions: Insights into the crystalline and amorphous phase assemblage

Popis výsledku v původním jazyce

Synthesized cement systems made with variable C₃A/C₄AF ratios, containing C₃S, gypsum and, optionally, calcite, were stored long-term at humid conditions at 5 or 20 °C, without any protection against atmospheric carbonation. Analytical techniques able to assess both the crystalline and amorphous phases were used. Experimental results were compared with thermodynamic simulations. The systems with C₃A/C₄AF < 1 better preserved the soundness of the C–S–H phase, which hosted iron, and prevented thaumasite formation. The addition of calcite in these systems inhibited carbonation. When occurred (mixtures without calcite), the carbonation was significantly more intense at ambient temperature. In the systems that underwent extensive deterioration, cross-linking of silicate structures, AFt decomposition, and iron release from the deteriorating C–S–H, occurred, while Al-incorporating amorphous silica, calcium carbonate polymorphs and hydrous iron oxide formed. The presence of unreacted C₃A in the systems with C₃A/C₄AF = 1, suggested that C–S–H decomposition was contributed by available sulfates.

Název v anglickém jazyce

Long-term sulfate resistance of synthesized cement systems with variable C₃A/C₄AF ratio at low temperature or ambient conditions: Insights into the crystalline and amorphous phase assemblage

Popis výsledku anglicky

Synthesized cement systems made with variable C₃A/C₄AF ratios, containing C₃S, gypsum and, optionally, calcite, were stored long-term at humid conditions at 5 or 20 °C, without any protection against atmospheric carbonation. Analytical techniques able to assess both the crystalline and amorphous phases were used. Experimental results were compared with thermodynamic simulations. The systems with C₃A/C₄AF < 1 better preserved the soundness of the C–S–H phase, which hosted iron, and prevented thaumasite formation. The addition of calcite in these systems inhibited carbonation. When occurred (mixtures without calcite), the carbonation was significantly more intense at ambient temperature. In the systems that underwent extensive deterioration, cross-linking of silicate structures, AFt decomposition, and iron release from the deteriorating C–S–H, occurred, while Al-incorporating amorphous silica, calcium carbonate polymorphs and hydrous iron oxide formed. The presence of unreacted C₃A in the systems with C₃A/C₄AF = 1, suggested that C–S–H decomposition was contributed by available sulfates.

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

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2022

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

160

Číslo periodika v rámci svazku

October

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

14

Strana od-do

106902

Kód UT WoS článku

000879907600004

EID výsledku v databázi Scopus

2-s2.0-85134800286