Utilisation of Coal Combustion Products as a Ternary Binder in Shotcrete

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F19%3A43918799" target="_blank" >RIV/60461373:22310/19:43918799 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21110/19:00331742

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Utilisation of Coal Combustion Products as a Ternary Binder in Shotcrete

Popis výsledku v původním jazyce

A hydraulic ternary binder was produced by intergrinding fly ash, CFBC fly ash and calcium hydroxide. The binder shows similar strength evolution as slow-hardening cements and can reach compressive strength over 40 MPa at 28 days without long-term detrimental expansion. The ternary binder can be blended with OPC which gives rise to ecofriendly concretes. Since the ternary binder generates large amount of ettringite during early hydration, the idea was to use this reaction for early-strength gain in shotcrete, in a similar way as reactions of alkali-free accelerators. A series of lab measurements showed that even 80% of OPC replacement by the ternary binder performs well for early strength gain. Based on those results, a full-scale mock-up experiment with 45% of OPC replacement proved to follow J2 strength curve for early-strength gain, using standard 7.5-8.5% alkali-free accelerator. Shotcrete of 4 m3 proved early strength gain, low fallout, good adhesion and workability, confirming lab results. Compressive strength of shotcrete reached over 30 MPa at 28 days, classifying shotcrete to C20/25 strength class.

Název v anglickém jazyce

Utilisation of Coal Combustion Products as a Ternary Binder in Shotcrete

Popis výsledku anglicky

A hydraulic ternary binder was produced by intergrinding fly ash, CFBC fly ash and calcium hydroxide. The binder shows similar strength evolution as slow-hardening cements and can reach compressive strength over 40 MPa at 28 days without long-term detrimental expansion. The ternary binder can be blended with OPC which gives rise to ecofriendly concretes. Since the ternary binder generates large amount of ettringite during early hydration, the idea was to use this reaction for early-strength gain in shotcrete, in a similar way as reactions of alkali-free accelerators. A series of lab measurements showed that even 80% of OPC replacement by the ternary binder performs well for early strength gain. Based on those results, a full-scale mock-up experiment with 45% of OPC replacement proved to follow J2 strength curve for early-strength gain, using standard 7.5-8.5% alkali-free accelerator. Shotcrete of 4 m3 proved early strength gain, low fallout, good adhesion and workability, confirming lab results. Compressive strength of shotcrete reached over 30 MPa at 28 days, classifying shotcrete to C20/25 strength class.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20101 - Civil engineering

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název statě ve sborníku

EUROCOALASH 2019 Proceedings

ISBN

978-0-9573263-2-3

ISSN

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e-ISSN

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Počet stran výsledku

8

Strana od-do

115-122

Název nakladatele

University of Dundee

Místo vydání

Dundee

Místo konání akce

Dundee

Datum konání akce

10. 6. 2019

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

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