Design of concrete mixtures with calcined brick soil

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F24%3A00382507" target="_blank" >RIV/68407700:21110/24:00382507 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1088/1742-6596/2911/1/012027" target="_blank" >https://doi.org/10.1088/1742-6596/2911/1/012027</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1742-6596/2911/1/012027" target="_blank" >10.1088/1742-6596/2911/1/012027</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Design of concrete mixtures with calcined brick soil

Popis výsledku v původním jazyce

Calcined clays have become one of the most researched themes in the field of cement replacement in recent years. However, it is not only pure kaolinite that can be used for thermal activation. There are other options such as the use of lower-grade clays. The brick soils can be considered as a representative of these lower-grade clays. The studied soil had a lower content of clay minerals (40%) and a higher content of other impurities, mainly quartz (18%) and calcite (43%). It also contained a minor amount of gypsum (4%). After thermal calcination at 650 °C, 37% of the amorphous matter was formed, which was assumed to be a reactive part. Based on this assumption, the mixture compositions, more precisely the substitutions in the concrete mixture were made using so-called rational design. The amount of amorphous matter was used to replace cement, while the amount of crystalline phases substituted a fine aggregate. Within this logic, 5 mixtures with a replacement level of up to 25% were designed. However, as the calcined brick soil was somewhat finer, a plasticizing admixture had to be used to achieve comparable workability without an immense increase in water dosage. The best compressive strength was obtained in the case of a mixture with the 10% replacement. Specifically, it reached 69 MPa, which was by 14% higher value than the reference. Nevertheless, also the mixture with 25% showed applicable results. Its compressive strength was 55 MPa, by 11% lower value compared to the reference mixture.

Název v anglickém jazyce

Design of concrete mixtures with calcined brick soil

Popis výsledku anglicky

Calcined clays have become one of the most researched themes in the field of cement replacement in recent years. However, it is not only pure kaolinite that can be used for thermal activation. There are other options such as the use of lower-grade clays. The brick soils can be considered as a representative of these lower-grade clays. The studied soil had a lower content of clay minerals (40%) and a higher content of other impurities, mainly quartz (18%) and calcite (43%). It also contained a minor amount of gypsum (4%). After thermal calcination at 650 °C, 37% of the amorphous matter was formed, which was assumed to be a reactive part. Based on this assumption, the mixture compositions, more precisely the substitutions in the concrete mixture were made using so-called rational design. The amount of amorphous matter was used to replace cement, while the amount of crystalline phases substituted a fine aggregate. Within this logic, 5 mixtures with a replacement level of up to 25% were designed. However, as the calcined brick soil was somewhat finer, a plasticizing admixture had to be used to achieve comparable workability without an immense increase in water dosage. The best compressive strength was obtained in the case of a mixture with the 10% replacement. Specifically, it reached 69 MPa, which was by 14% higher value than the reference. Nevertheless, also the mixture with 25% showed applicable results. Its compressive strength was 55 MPa, by 11% lower value compared to the reference mixture.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

<a href="/cs/project/GA22-16577S" target="_blank" >GA22-16577S: Možnosti využití tepelně aktivovaných jílů jako částečné náhrady cementu</a><br>

Návaznosti

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

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název statě ve sborníku

Journal of Physics: Conference Series 2911

ISBN

—

ISSN

1742-6588

e-ISSN

1742-6596

Počet stran výsledku

6

Strana od-do

—

Název nakladatele

IOP Publishing Ltd.

Místo vydání

Bristol

Místo konání akce

Miskolctapolca

Datum konání akce

4. 9. 2024

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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