Implementation of the ternary binder in shotcrete during the construction of the metro tunnel in Prague, Czech Republic

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F20%3A00343851" target="_blank" >RIV/68407700:21110/20:00343851 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.2495/HPSM200171" target="_blank" >https://doi.org/10.2495/HPSM200171</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.2495/HPSM200171" target="_blank" >10.2495/HPSM200171</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Implementation of the ternary binder in shotcrete during the construction of the metro tunnel in Prague, Czech Republic

Popis výsledku v původním jazyce

This paper summarizes recent achievements in shotcrete utilizing ternary binder. Ternary binder is composed mainly from fly ashes and, during hydration, produces large volumes of ettringite beneficial for early-strength gain in shotcrete. Savings in mineral resources, utilization of by-products and reduction in clinker consumption are seen as key benefits for the implemented solution. Design of ternary binder is discussed, including thermodynamical modelling and evolution of volume fractions in the binder. Ternary binder showed high stability with regards to input oxide variations, naturally occurring in heterogeneous fly ash production. Based on the results, a mock-up experiment was performed to verify the effectiveness of ternary binder in shotcrete with excellent results. Approximately 20 tons of the ternary binder is weekly consumed in the pilot project of metro D in Prague. Shotcrete serves as a temporary primary lining in the new Austrian tunnelling method. Substitute for cement in the form of ternary binder reached 50% for concrete strength class C25/30, following J2 curve strength gain.

Název v anglickém jazyce

Implementation of the ternary binder in shotcrete during the construction of the metro tunnel in Prague, Czech Republic

Popis výsledku anglicky

This paper summarizes recent achievements in shotcrete utilizing ternary binder. Ternary binder is composed mainly from fly ashes and, during hydration, produces large volumes of ettringite beneficial for early-strength gain in shotcrete. Savings in mineral resources, utilization of by-products and reduction in clinker consumption are seen as key benefits for the implemented solution. Design of ternary binder is discussed, including thermodynamical modelling and evolution of volume fractions in the binder. Ternary binder showed high stability with regards to input oxide variations, naturally occurring in heterogeneous fly ash production. Based on the results, a mock-up experiment was performed to verify the effectiveness of ternary binder in shotcrete with excellent results. Approximately 20 tons of the ternary binder is weekly consumed in the pilot project of metro D in Prague. Shotcrete serves as a temporary primary lining in the new Austrian tunnelling method. Substitute for cement in the form of ternary binder reached 50% for concrete strength class C25/30, following J2 curve strength gain.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20101 - Civil engineering

Projekt

<a href="/cs/project/TH02010206" target="_blank" >TH02010206: Významná ekonomická a materiálová úspora při výstavbě liniových podzemních konstrukcí zahrnutím popílku a druhotného odpadu do betonového ostění staveb</a><br>

Návaznosti

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

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název statě ve sborníku

WIT Transactions on the Built Environment

ISBN

978-1-78466-389-6

ISSN

1746-4498

e-ISSN

—

Počet stran výsledku

7

Strana od-do

161-167

Název nakladatele

WIT PRESS

Místo vydání

Wessex

Místo konání akce

Prague

Datum konání akce

2. 9. 2020

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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