Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Study of the rheology of self-compacting concrete with fine recycled concrete aggregates
https://orcid.org/0000-0001-6766-2736
Highlights Self-compacting concrete (SCC) is a rapidly increasing trend in the construction industry. Recycled aggregates (RA) are already used in concrete production but normally the fine fraction is not. The fresh state behavior of concrete with recycled aggregates is one of the barriers to its applications. The use of fine RA in SCC production is proved to be feasible. If SCC characteristics are requested 90min after mixing, no more than 20% of fine RA should be used.
Abstract This work studies the effect of incorporating fine recycled aggregates on the rheology of self-compacting concrete over time (at 15, 45 and 90min). The fine fraction of the natural aggregates was replaced at 0%, 20%, 50% and 100% with recycled sand. The fresh-state properties were studied by empirical tests (slump-flow, J-Ring, L-Box) and fundamental ones in an ICAR rheometer. The mixes with 50% and 100% recycled sand lost their SCC characteristics at 90min. Contrarily the mix with 20% replacement maintained suitable passing and filling ability. The causes of this trend were an initial increase of plastic viscosity and afterwards an increase of yield stress. The compressive strength of the 50% and 100% replacement mixes decreased significantly and that of the 20% replacement mix less than 10%.
Study of the rheology of self-compacting concrete with fine recycled concrete aggregates
https://orcid.org/0000-0001-6766-2736
Highlights Self-compacting concrete (SCC) is a rapidly increasing trend in the construction industry. Recycled aggregates (RA) are already used in concrete production but normally the fine fraction is not. The fresh state behavior of concrete with recycled aggregates is one of the barriers to its applications. The use of fine RA in SCC production is proved to be feasible. If SCC characteristics are requested 90min after mixing, no more than 20% of fine RA should be used.
Abstract This work studies the effect of incorporating fine recycled aggregates on the rheology of self-compacting concrete over time (at 15, 45 and 90min). The fine fraction of the natural aggregates was replaced at 0%, 20%, 50% and 100% with recycled sand. The fresh-state properties were studied by empirical tests (slump-flow, J-Ring, L-Box) and fundamental ones in an ICAR rheometer. The mixes with 50% and 100% recycled sand lost their SCC characteristics at 90min. Contrarily the mix with 20% replacement maintained suitable passing and filling ability. The causes of this trend were an initial increase of plastic viscosity and afterwards an increase of yield stress. The compressive strength of the 50% and 100% replacement mixes decreased significantly and that of the 20% replacement mix less than 10%.
Study of the rheology of self-compacting concrete with fine recycled concrete aggregates
https://orcid.org/0000-0001-6766-2736
Highlights Self-compacting concrete (SCC) is a rapidly increasing trend in the construction industry. Recycled aggregates (RA) are already used in concrete production but normally the fine fraction is not. The fresh state behavior of concrete with recycled aggregates is one of the barriers to its applications. The use of fine RA in SCC production is proved to be feasible. If SCC characteristics are requested 90min after mixing, no more than 20% of fine RA should be used.
Abstract This work studies the effect of incorporating fine recycled aggregates on the rheology of self-compacting concrete over time (at 15, 45 and 90min). The fine fraction of the natural aggregates was replaced at 0%, 20%, 50% and 100% with recycled sand. The fresh-state properties were studied by empirical tests (slump-flow, J-Ring, L-Box) and fundamental ones in an ICAR rheometer. The mixes with 50% and 100% recycled sand lost their SCC characteristics at 90min. Contrarily the mix with 20% replacement maintained suitable passing and filling ability. The causes of this trend were an initial increase of plastic viscosity and afterwards an increase of yield stress. The compressive strength of the 50% and 100% replacement mixes decreased significantly and that of the 20% replacement mix less than 10%.
Study of the rheology of self-compacting concrete with fine recycled concrete aggregates
Carro-López, Diego (Autor:in) / González-Fonteboa, Belén (Autor:in) / de Brito, Jorge (Autor:in) / Martínez-Abella, Fernando (Autor:in) / González-Taboada, Iris (Autor:in) / Silva, Pedro (Autor:in)
Construction and Building Materials ; 96 ; 491-501
09.08.2015
11 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Self-compacting concrete , Fine recycled aggregates , Absorption , Rheology , Rheometer , Mortar , Filling ability , Passing ability , W<inf>24h</inf> , aggregates’ absorption at 24<hsp></hsp>h , W<inf>10min</inf> , aggregates’ absorption at 10<hsp></hsp>min , CRA , coarse recycled aggregates , CEM , concrete equivalent mortar , CDW , construction and demolition waste , FRA , fine recycled aggregates , SCC , self-compacting concrete
Study of the rheology of self-compacting concrete with fine recycled concrete aggregates
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