Influence of cement replacement by admixture on mechanical properties of concrete

Result code in 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>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Influence of cement replacement by admixture on mechanical properties of concrete

Original language description

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.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20501 - Materials engineering

Project

<a href="/en/project/GA17-19463S" target="_blank" >GA17-19463S: Analysis of the relations between the microstructure and macroscopic properties of ultra-high performance concretes</a><br>

Continuities

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

Publication year

2018

Confidentiality

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

Article name in the collection

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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Number of pages

8

Pages from-to

1267-1274

Publisher name

ČVUT v Praze, Fakulta stavební

Place of publication

Praha

Event location

Praha

Event date

Aug 29, 2018

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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