Utilisation of Coal Combustion Products as a Ternary Binder in Shotcrete

Result code in 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>
Alternative codes found
RIV/68407700:21110/19:00331742
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Utilisation of Coal Combustion Products as a Ternary Binder in Shotcrete
Original language description
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.
Czech name
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Czech description
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Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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