13C,27Al and 29Si NMR investigation of the hydration kinetics of Portland-limestone cement pastes containing CH3-COO¯-R+(R=H or Na) additives

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378297%3A_____%2F22%3A00555838" target="_blank" >RIV/68378297:_____/22:00555838 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.3390/ma15062004" target="_blank" >https://doi.org/10.3390/ma15062004</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/ma15062004" target="_blank" >10.3390/ma15062004</a>

Jazyk výsledku

angličtina

Název v původním jazyce

13C,27Al and 29Si NMR investigation of the hydration kinetics of Portland-limestone cement pastes containing CH3-COO¯-R+(R=H or Na) additives

Popis výsledku v původním jazyce

The hydration kinetics of Portland-limestone cement pastes with organic additives in the form of acetic acid and sodium acetate were studied by using solid-state 13C, 27Al and 29Si NMR spectroscopy. The evolution of the relative content of various phases was monitored over the period of one month: amorphous and crystalline calcite (in 13C spectra), ettringite, aluminum in C-S-H gel, calcium aluminates and calcium hydroaluminates (in 27Al spectra), as well as alite, belite and siliconnin C-S-H gel (in 29Si spectra). The retarding effect of the additives on cement hydration at early age was demonstrated. We show that the kinetics of phase assemblage formation is influenced by the acetate ion adsorption on the surface of the anhydrous cement components and hydrated phases. The kinetics of formation of ettringite in the cement paste, depending on the addition of acetic and or sodium acetate, is discussed in the context of potential thaumasite sulfate attack.

Název v anglickém jazyce

13C,27Al and 29Si NMR investigation of the hydration kinetics of Portland-limestone cement pastes containing CH3-COO¯-R+(R=H or Na) additives

Popis výsledku anglicky

The hydration kinetics of Portland-limestone cement pastes with organic additives in the form of acetic acid and sodium acetate were studied by using solid-state 13C, 27Al and 29Si NMR spectroscopy. The evolution of the relative content of various phases was monitored over the period of one month: amorphous and crystalline calcite (in 13C spectra), ettringite, aluminum in C-S-H gel, calcium aluminates and calcium hydroaluminates (in 27Al spectra), as well as alite, belite and siliconnin C-S-H gel (in 29Si spectra). The retarding effect of the additives on cement hydration at early age was demonstrated. We show that the kinetics of phase assemblage formation is influenced by the acetate ion adsorption on the surface of the anhydrous cement components and hydrated phases. The kinetics of formation of ettringite in the cement paste, depending on the addition of acetic and or sodium acetate, is discussed in the context of potential thaumasite sulfate attack.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

<a href="/cs/project/GC21-35772J" target="_blank" >GC21-35772J: Změny mikrostruktury směsných cementových past s vápencem na základě kombinovaného vlívu síranových a chloridových iontů</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

Materials

ISSN

1996-1944

e-ISSN

1996-1944

Svazek periodika

15

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

13

Strana od-do

2004

Kód UT WoS článku

000774907300001

EID výsledku v databázi Scopus

2-s2.0-85126448095