Influence of carbon nanotubes and polycarboxylate superplasticiser on the Portland cement hydration process

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26110%2F21%3APU141513" target="_blank" >RIV/00216305:26110/21:PU141513 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S095006182102403X" target="_blank" >https://www.sciencedirect.com/science/article/pii/S095006182102403X</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.conbuildmat.2021.124648" target="_blank" >10.1016/j.conbuildmat.2021.124648</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Influence of carbon nanotubes and polycarboxylate superplasticiser on the Portland cement hydration process

Popis výsledku v původním jazyce

The aim of this study was to investigate the changes in the heat of hydration of Portland cement in case of its modification by a complex admixture (CA) based on multi-walled carbon nanotubes/carboxymethyl cellulose (MWCNT/CMC) suspension and polycarboxylate ether (PCE) plasticiser. The application of the CA leads to the prolongation of the duration of the induction, acceleration and later appearance of the peak at deceleration periods of Portland cement hydration by 4 h 55 min, 15 h 45 min and 21 h 30 min, respectively. The CA decreases the heat flow of cement by 35% in the acceleration period and total hydration heat emission by 26% after 48 h. The CA decreases the formation of portlandite and ettringite while the stability of gypsum increases. The identified tendency of changes in formed hydrates explains the retardation of C3S hydration. The evaluation of the cement hydration rate during the acceleration period by the angle of the linear function of the cement hydration heat flow curve was proposed. The cement modified by the CA can be useful in construction practice for the concreting of massive structures where low heat emission is a requirement, for the development of the mixture for new concrete technologies like massive concrete structures, hot weather concreting etc.

Název v anglickém jazyce

Influence of carbon nanotubes and polycarboxylate superplasticiser on the Portland cement hydration process

Popis výsledku anglicky

The aim of this study was to investigate the changes in the heat of hydration of Portland cement in case of its modification by a complex admixture (CA) based on multi-walled carbon nanotubes/carboxymethyl cellulose (MWCNT/CMC) suspension and polycarboxylate ether (PCE) plasticiser. The application of the CA leads to the prolongation of the duration of the induction, acceleration and later appearance of the peak at deceleration periods of Portland cement hydration by 4 h 55 min, 15 h 45 min and 21 h 30 min, respectively. The CA decreases the heat flow of cement by 35% in the acceleration period and total hydration heat emission by 26% after 48 h. The CA decreases the formation of portlandite and ettringite while the stability of gypsum increases. The identified tendency of changes in formed hydrates explains the retardation of C3S hydration. The evaluation of the cement hydration rate during the acceleration period by the angle of the linear function of the cement hydration heat flow curve was proposed. The cement modified by the CA can be useful in construction practice for the concreting of massive structures where low heat emission is a requirement, for the development of the mixture for new concrete technologies like massive concrete structures, hot weather concreting etc.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2021

Kód důvěrnosti údajů

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

Název periodika

Construction and building materials

ISSN

0950-0618

e-ISSN

1879-0526

Svazek periodika

304

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

12

Strana od-do

1-12

Kód UT WoS článku

000696942600004

EID výsledku v databázi Scopus

2-s2.0-85113935592