Blended Cements with Calcined Illitic Clay: Workability and Hydration

Marchetti, Guillermina; Pokorný, Jaroslav; Tironi, Alejandra; Trezza, Mónica Adriana; Rahhal, Viviana Fátima; Pavlík, Zbyšek; Černý, Robert; Irassar, Edgardo F.

doi:10.1007/978-94-024-1207-9_50

Cited by 12 publications

(3 citation statements)

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“…Workability and hydration of blended cements with calcined illitic clay have been studied by Marchetti et al [ 140 ]. They used two types of ground, calcined illitic clays and OPC, the content of which was reduced in favour of each clay by 15%, 25% and 35% by weight.…”

Section: Calcined Clay In Cement and Concrete Technologymentioning

confidence: 99%

Calcined Clay as Supplementary Cementitious Material

2020

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Calcined clays are the only potential materials available in large quantities to meet the requirements of eco-efficient cement-based materials by reducing the clinker content in blended cements or reducing the cement content in concrete. More than 200 recent research papers on the idea of replacing Portland cement with large amounts of calcined clay are presented and discussed in detail. First, the fundamental information about the properties and structure of clay minerals is described. Then, the process of activation and hydration of clays is discussed, including the methods of pozzolanic activity assessment. Additionally, various testing methods of clays from different worldwide deposits are presented. The application of calcined clay in cement and concrete technology is then introduced. A separate chapter is devoted to lime calcined clay cement. Then an influence of calcined clay on durability of concrete is summarized. Finally, conclusions are formulated.

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Section: Calcined Clay In Cement and Concrete Technologymentioning

confidence: 99%

Calcined Clay as Supplementary Cementitious Material

2020

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“…Verschiedene Studien haben gezeigt, dass calcinierter Ton bzgl. der Klinkerreduzierung ein vielversprechender Substitutionsstoff ist [13, 14]. Für die Anwendung in der Bauindustrie sind dabei kosteneffiziente Varianten des calcinierten Tons zu bevorzugen.…”

Section: Introductionunclassified

Betone aus Multikompositzementen mit Kalkstein und calciniertem Ton

Herget

Proske

Graubner

2020

Beton und Stahlbetonbau

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Eine Möglichkeit, um die mit der Betonbauweise verbundenen Treibhausgasemissionen zu reduzieren, ist die verstärkte Verwendung klinkerarmer Zemente. Allerdings stehen die klassischen Klinkersubstitutionsstoffe Steinkohlenflugasche und Hüttensand in Deutschland schon heute nicht in gewünschter Menge zur Verfügung. Daher sind kalksteinmehlreiche Bindemittel hier eine vielversprechende Option, wobei durch Zugabe von calciniertem Ton der Zementklinkergehalt weiter gesenkt werden kann. Zur Identifikation der Leistungsfähigkeit derartiger Zemente wurden Mörtel‐ und Betonproben aus Zementen mit Kalksteinmehl und unterschiedlichen calcinierten Tonen mit einer maximalen Substitutionsrate von 50 M.‐ % hinsichtlich der Frischmörteleigenschaften und auch verschiedener Festmörteleigenschaften wie Druckfestigkeit, Schwindverhalten und Karbonatisierungstiefe untersucht. Durch den kombinierten Einsatz von Kalksteinmehl und calciniertem Ton konnten gegenüber den Referenzproben aus Portlandzement (CEM I) vergleichbare 28‐d‐Druckfestigkeiten, allerdings bei verminderter Frühfestigkeit, erreicht werden. Sowohl der Widerstand gegenüber Karbonatisierung als auch die Schwindverformung sind bei gleichen Festigkeiten etwas geringer. Insgesamt wird durch die Verwendung derartiger Zementzusammensetzungen eine Minderung des Treibhauspotenzials der Betone von 40 % erreicht.

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“…Na construção de grandes barragens como as de Jupiá, Ilha Solteira e Água Vermelha foram utilizadas mais de 250.000 ton de pozolanas até o final da década de 1970, produzidas pela calcinação de argilas comuns(SAAD; PAULON, 1982). O primeiro objetivo era o de minimizar as reações álcali-agregado (pois o agregado disponível na região era suspectível a esse ataque químico), e os resultados foram muito bons.Alguns estudos focalizados em outros tipos de argilas foram realizados na década de 1990 (HE; MAKOVICKY; OSBAECK, 1995; HE; OSBAECK; MAKOVICKY, 1995), mas é a partir do final da primeira década dos anos 2000 que os estudos publicados começam a ficar mais frequentes: tratando de montmorilonitas, de ilitas, de haloisitas, de cloritas, e, mais recentemente, mesmo de misturas complexas de minerais que são as argilas comunsHAGO, 2006;SINGH;GARG, 2006;BUCHWALD et al, 2009;TIRONI et al, 2013;SKIBSTED, 2014SKIBSTED, , 2015CHATTERJEE, 2015;SIDDIQUE, 2015;TAYLOR-LANGE et al, 2015;HOLLANDERS et al, 2016;MOHAMMED, 2017;MARCHETTI et al, 2018; LEMMA et al, 2018;TREZZA et al, 2018;FERREIRO;HERFORT;DAMTOFT, 2018). Em todos esses trabalhos foi verificado que outras argilas calcinadas, além do metacaulim, têm algum efeito como SCM, seja agindo como pozolana (embora o metacaulim ainda seja a pozolana mais eficiente dentre as argilas calcinadas), seja atuando como filer com baixa atividade pozolânica.…”

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Estudo de propriedades de pastas e argamassas cimentícias compostas com vermiculita brasileira (in natura e calcinada).

Rojas-Ramírez¹

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In the vermiculite productionprocessa residue consisting of particles too small to be used commercially is generated. This waste does not have a large-scale applicationyet. An alternative that has been studied is the association with Portland cement in mortar and concrete formulations, as a function of the chemical composition of the residue: high amount of aluminium, silicon and magnesium which may have interactions with the binder. However, the residue has a high specific surface area, in comparison to cement, a fact that can increase the water-demand to mix and limit its application. For this, an alternative is the calcination of this fine residue, as it is done for other clays (kaolin, for example), so that the specific surface area (SSA) is smaller and eventually activates pozzolanic properties in the respective clay. Thus, in this work the various characteristics of cement pastes after addition of vermiculite fine residue were evaluated: chemical reaction, formation of the hydrated products, rheological properties, both after mixing and along the hydration. It was verified that in general the chemical reaction is not affected after the addition of vermiculite, although the formation of aluminates is intensified in the composition with greater amount of in nature residue. Regarding its behaviour in the fresh state, it was observed that the higher SSA of the residue strongly impacts the rheological properties of the pastes, although with a 5% content the changes are minimal. Using these same compositions to evaluate the performance in the hardened state of mortars, it was verified that there is no effect on these properties up to 5% of substitution, regardless of the thermal treatment used. Thus, considering the economic aspects of transport as well as the costs of calcination, it is possible to recommend the addition of 5% of vermiculite in nature without compromising the performance of the products, although it is not possible to determine the its durability during the use.

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Blended Cements with Calcined Illitic Clay: Workability and Hydration

Cited by 12 publications

References 11 publications

Calcined Clay as Supplementary Cementitious Material

Calcined Clay as Supplementary Cementitious Material

Betone aus Multikompositzementen mit Kalkstein und calciniertem Ton

Estudo de propriedades de pastas e argamassas cimentícias compostas com vermiculita brasileira (in natura e calcinada).

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