Influence of cement replacement by admixture on mechanical properties of concrete

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F18%3A00323249" target="_blank" >RIV/68407700:21110/18:00323249 - 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

Influence of cement replacement by admixture on mechanical properties of concrete

Popis výsledku v původním jazyce

Concrete is a composite material composed of many compounds. The mechanical properties of the individual components determine the mechanical properties of concrete. High strength concrete has higher amount of cement and additive compared with normal strength concrete. Higher amount of ce-ment has positive influence on compressive strength, but negative on price. Also, a carbon footprint is not negligible. This paper deals with the replacement of cement by metakaolin, fly ash and silica fume in an effort to reduce this carbon footprint, reduce the cement amount and improve selected concrete prop-erties by using alternative or secondary materials generated as waste from other industries. Silica fume is the waste product of metallurgical industry. Fly ash is the settled soot resulting from the combustion of finely ground coal. These additives have a positive effect on the mechanical properties of concrete. Silica fume and metakaolin increase compressive and tensile strength, resistance to pressurized water and resistance of concrete to water with deicing chemicals. Fly ash has a positive influence of workabil-ity of fresh concrete. Additives were added as a substitute for 5%, 10%, 20% 30%, 50% and 80% of cement. The first tests were performed on cement pastes and after evaluation of results were performed tests on concrete mixes contain aggregates for chosen percent of substitution of cement by additives. Flexural tensile strength and compressive strength tests were performed and evaluated. An optimal amount of cement substitute by additive has been determined to improve the required properties.

Název v anglickém jazyce

Influence of cement replacement by admixture on mechanical properties of concrete

Popis výsledku anglicky

Concrete is a composite material composed of many compounds. The mechanical properties of the individual components determine the mechanical properties of concrete. High strength concrete has higher amount of cement and additive compared with normal strength concrete. Higher amount of ce-ment has positive influence on compressive strength, but negative on price. Also, a carbon footprint is not negligible. This paper deals with the replacement of cement by metakaolin, fly ash and silica fume in an effort to reduce this carbon footprint, reduce the cement amount and improve selected concrete prop-erties by using alternative or secondary materials generated as waste from other industries. Silica fume is the waste product of metallurgical industry. Fly ash is the settled soot resulting from the combustion of finely ground coal. These additives have a positive effect on the mechanical properties of concrete. Silica fume and metakaolin increase compressive and tensile strength, resistance to pressurized water and resistance of concrete to water with deicing chemicals. Fly ash has a positive influence of workabil-ity of fresh concrete. Additives were added as a substitute for 5%, 10%, 20% 30%, 50% and 80% of cement. The first tests were performed on cement pastes and after evaluation of results were performed tests on concrete mixes contain aggregates for chosen percent of substitution of cement by additives. Flexural tensile strength and compressive strength tests were performed and evaluated. An optimal amount of cement substitute by additive has been determined to improve the required properties.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20501 - Materials engineering

Projekt

<a href="/cs/project/GA17-19463S" target="_blank" >GA17-19463S: Analýza závislostí mezi mikrostrukturou a makroskopickými vlastnostmi ultravysokohodnotných betonů</a><br>

Návaznosti

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

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název statě ve sborníku

Proceedings of the 12th International fib PhD Symposium in Civil Engineering

ISBN

978-80-01-06401-6

ISSN

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e-ISSN

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Počet stran výsledku

8

Strana od-do

1267-1274

Název nakladatele

ČVUT v Praze, Fakulta stavební

Místo vydání

Praha

Místo konání akce

Praha

Datum konání akce

29. 8. 2018

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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