Re-hydration of thermally treated cement pastes containing limestone and metakaolin

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378297%3A_____%2F25%3A00600465" target="_blank" >RIV/68378297:_____/25:00600465 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1007/978-3-031-70277-8_29" target="_blank" >https://doi.org/10.1007/978-3-031-70277-8_29</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/978-3-031-70277-8_29" target="_blank" >10.1007/978-3-031-70277-8_29</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Re-hydration of thermally treated cement pastes containing limestone and metakaolin

Popis výsledku v původním jazyce

The notable environmental impact of Portland cement concrete manufacture is of great concern, driving the efforts towards the design of sustainable binders with reduced cement component. Here, information about the dehydrationnof cement pastes containing limestone and metakaolin, and the hydration characteristics of the materials obtained after heat treatment (1 h at 800 ºC), are reported. The analytical techniques used include X-ray diffraction, infrared spectroscopy, scanning electron microscopy, and isothermal conductive calorimetry. The results showed that the dehydration of the studied cement paste fines led to the formation of clinker phases and CaO, with C2S being dominant. The increase of limestone content in cement resulted in the formation of lower amounts of clinker phases, while less CaO formed in the thermally treated paste containing metakaolin. The re-hydration process was accelerated with the increasing limestone content in cements, but it was considerably delayed in the case of the thermally treated blend nwith metakaolin. Re-hydration of the thermally treated fines resulted in the recovery of the hydrated phases, and it was characterized by increased formation of Ca(OH)2 and adsorption of water, as well as by the formation of C-S-H with lessnpolymerized silicate chains, compared to the original cement paste fines.

Název v anglickém jazyce

Re-hydration of thermally treated cement pastes containing limestone and metakaolin

Popis výsledku anglicky

The notable environmental impact of Portland cement concrete manufacture is of great concern, driving the efforts towards the design of sustainable binders with reduced cement component. Here, information about the dehydrationnof cement pastes containing limestone and metakaolin, and the hydration characteristics of the materials obtained after heat treatment (1 h at 800 ºC), are reported. The analytical techniques used include X-ray diffraction, infrared spectroscopy, scanning electron microscopy, and isothermal conductive calorimetry. The results showed that the dehydration of the studied cement paste fines led to the formation of clinker phases and CaO, with C2S being dominant. The increase of limestone content in cement resulted in the formation of lower amounts of clinker phases, while less CaO formed in the thermally treated paste containing metakaolin. The re-hydration process was accelerated with the increasing limestone content in cements, but it was considerably delayed in the case of the thermally treated blend nwith metakaolin. Re-hydration of the thermally treated fines resulted in the recovery of the hydrated phases, and it was characterized by increased formation of Ca(OH)2 and adsorption of water, as well as by the formation of C-S-H with lessnpolymerized silicate chains, compared to the original cement paste fines.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20501 - Materials engineering

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název statě ve sborníku

Proceedings of the RILEM spring convention and conference 2024

ISBN

978-3-031-70276-1

ISSN

2211-0844

e-ISSN

2211-0852

Počet stran výsledku

9

Strana od-do

249-257

Název nakladatele

Springer

Místo vydání

Cham

Místo konání akce

Milano

Datum konání akce

10. 4. 2024

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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