Early hydration of low-energy cements from clinkers doped with combination of dopants

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26232511%3A_____%2F23%3AN0000082" target="_blank" >RIV/26232511:_____/23:N0000082 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Early hydration of low-energy cements from clinkers doped with combination of dopants

Popis výsledku v původním jazyce

The early hydration and rheological properties of fresh cement pastes prepared from low-energy clinkers activated with SO3 and co-doped with Li2O, CuO, and MgO were studied. SO3 and selected foreign elements act as mineralizers and fluxes, partly incorporated in clinker phases and change their phase composition and texture. Reactive cements can be prepared from this clinker with low LSF and alite/belite ratio opposite to OPC. Heat flow development of cement pastes during early hydration was determined by isothermal calorimetry. Technological parameters were correlated with the rheological properties of cement pastes determined by rotational rheometer in flow regime. The role of dopants in the early hydration of cement pastes and its structuration is discussed in the paper. Co-doping with Li accelerates early hydration but compromises long-term strengths while Cu slows down early hydration reactions showing good later ages performance. Cement pastes' flow properties can be divided into 4 periods with respect to reaching the steady state. The 16th International Congress on the Chemistry of Cement 2023 (ICCC2023), September 18–22, 2023, Bangkok, Thailand, Congress Paper vol. II, 191 – 194.

Název v anglickém jazyce

Early hydration of low-energy cements from clinkers doped with combination of dopants

Popis výsledku anglicky

The early hydration and rheological properties of fresh cement pastes prepared from low-energy clinkers activated with SO3 and co-doped with Li2O, CuO, and MgO were studied. SO3 and selected foreign elements act as mineralizers and fluxes, partly incorporated in clinker phases and change their phase composition and texture. Reactive cements can be prepared from this clinker with low LSF and alite/belite ratio opposite to OPC. Heat flow development of cement pastes during early hydration was determined by isothermal calorimetry. Technological parameters were correlated with the rheological properties of cement pastes determined by rotational rheometer in flow regime. The role of dopants in the early hydration of cement pastes and its structuration is discussed in the paper. Co-doping with Li accelerates early hydration but compromises long-term strengths while Cu slows down early hydration reactions showing good later ages performance. Cement pastes' flow properties can be divided into 4 periods with respect to reaching the steady state. The 16th International Congress on the Chemistry of Cement 2023 (ICCC2023), September 18–22, 2023, Bangkok, Thailand, Congress Paper vol. II, 191 – 194.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

20100 - Civil engineering

Projekt

<a href="/cs/project/GA23-05122S" target="_blank" >GA23-05122S: Vliv kombinace tavidel, mineralizátorů a SCMs na vlastnosti nízkoenergetického slínku</a><br>

Návaznosti

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

Rok uplatnění

2023

Kód důvěrnosti údajů

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