Ternary Blended Cement with Limestone Filler and Kaolinitic Calcined Clay

Tironi, Alejandra; Scian, Alberto N.; Irassar, Edgardo F.

doi:10.1007/978-94-017-9939-3_24

Cited by 5 publications

(4 citation statements)

References 5 publications

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“…These replacement levels are sufficient to complete the pozzolanic reaction between the MK amount in calcined clay and the calcium hydroxide provided by hydration of PC fraction. The percentage of LF incorporated is sufficient to stimulate the pozzolanic reaction (Tironi et al 2015).…”

Section: Materials and Blended Cementsmentioning

confidence: 99%

“…The aim of this research is to explore the interaction between the filler effect and pozzolanic effect caused by calcined clay (CC) obtained from low-grade kaolinitic clay and limestone filler (LF) as partial replacement for portland cement in binary and ternary blended cements. Tironi et al (2015) reported the pozzolanic activity of these blended cements as assessed by the Frattini test. At 2 days, blended cements with 5% LF and 15% CC did not have pozzolanic activity; whereas blended cements with 30% CC and 30% CC + 10% LF did have a positive result.…”

Section: Introductionmentioning

confidence: 99%

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Blended Cements with Limestone Filler and Kaolinitic Calcined Clay: Filler and Pozzolanic Effects

Tironi

Scian

Irassar

2017

J. Mater. Civ. Eng.

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In this paper, binary and ternary blended cements (BC) based on calcined clay (CC, 0-30%) obtained from low-grade kaolinitic clay and limestone filler (LF, 0-10%) were developed and the interaction between the filler effect and pozzolanic effect on the compressive strength, hydration phases, and pore-size distribution were studied. Results show that early compressive strength decreases for high levels of replacement (10LF30CC) because of a dilution effect that cannot be compensated for by the filler and pozzolanic effects. Based on calcium hydroxide (CH) content, the addition of limestone filler in ternary blended cements is favorable to the development of pozzolanic reaction of calcined clay at an early age. This study shows that dilution, filler, and pozzolanic effects are relevant at 2 days, filler and pozzolanic effects are important at 7 days, and the pozzolanic effect is the most important at a later age.

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Section: Materials and Blended Cementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Blended Cements with Limestone Filler and Kaolinitic Calcined Clay: Filler and Pozzolanic Effects

Tironi

Scian

Irassar

2017

J. Mater. Civ. Eng.

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“…Ternary blends of cement, metakaolin and limestone have been investigated by many authors (Antoni et al, 2012;Avet and Scrivener, 2018a, b;Bishnoi and Maity, 2018;Cancio Díaz et al, 2017;Favier et al, 2018;Kunther et al, 2015;Nied et al, 2015;Scrivener et al, 2017;Tironi et al, 2015). However, the role of calcium carbonate in raw clays (before calcination) without kaolinite has been paid little attention to.…”

Section: Introductionmentioning

confidence: 99%

Characterisation of calcined raw clays suitable as supplementary cementitious materials

Danner

Norden

Justnes

2018

Applied Clay Science

112

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The potential use of two raw clays (Clay A: kaolin; Clay B: calcareous montmorillonite) as supplementary cementitious material (SCM) in blended cements was investigated. Cement replacement in mortars by 20% calcined Clay A and Clay B resulted in a considerable 28 day compressive strength improvement. The pozzolanic reactivity of Clay A and B is explained by characterization of the structural changes upon calcination with XRD, ICP-MS, FT-IR, 27Al-NMR, Mössbauer spectroscopy and SEM. At the temperature giving highest pozzolanic reactivity, kaolinite and montmorillonite were completely dehydroxylated, while calcite from Clay B was not completely decomposed. FT-IR, 27Al-NMR and Mössbauer spectroscopy revealed considerable structural deformations of kaolinite in Clay A and montmorillonite in Clay B resulting in an amorphous, reactive state. Oxidation of iron in Clay B during calcination contributed to strong distortions of the octahedral sheet in the montmorillonite structure. Additionally, the formation of a glass phase due to reaction of coccoliths (CaCO3) and montmorillonite was observed.

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“…Kaolinitic clays abundantly exist in the crust of the earth. After the dehydroxylation of the kaolinitic clay under a calcining process between 600 and 800°C, metakaolin which shows comparable pozzolanic properties will be generated [20,21]. Most properties of concrete can be enhanced by adding limestone and calcined clay [22].…”

Section: Constraint and Opportunity To Develop Scms-based Printable Cmentioning

confidence: 99%

Feasibility of Using Low CO2 Concrete Alternatives in Extrusion-Based 3D Concrete Printing

et al. 2018

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In conventional concrete, replacing high-volume (more than 45%) of ordinary Portland cement (OPC) by supplementary cementitious materials (SCMs) is not a novel CO 2 reduction method, whereas rarely in 3D printable concrete. This study attempts to explore the feasibility of using SCMs in 3D printable concrete. Initially, the existing binder mixes, required fresh properties and a research method of 3D printable concrete are investigated by reviewing the relevant papers. Additionally, the constraints and opportunities of using SCMs in 3D printable concrete are illustrated and summarized. Finally, it has been found that up to 45% of cement can be replaced by a blend of fly ash and silica fume. The essential fresh properties of 3D printable concrete include extrudability, workability, open time, buildability and structural build-up, which are influenced by the binder mix, particle size distribution, water to binder ratio, binder to aggregate ratio, admixture addition, the dosage of reinforced-fibers, etc. On the other hand, there are many limitations to develop SCMs-based 3D printable concrete, such as few relevant studies, a lack of the certificated standard, massive related-parameters and the shortage of common SCMs. For the first three problems, it can be solved with the development of 3D printable concrete. For the last one, calcined clay is one potential alternative for developing sustainable 3D printable concrete in the areas where are in short supply of fly ash and silica fume.

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Ternary Blended Cement with Limestone Filler and Kaolinitic Calcined Clay

Cited by 5 publications

References 5 publications

Blended Cements with Limestone Filler and Kaolinitic Calcined Clay: Filler and Pozzolanic Effects

Blended Cements with Limestone Filler and Kaolinitic Calcined Clay: Filler and Pozzolanic Effects

Characterisation of calcined raw clays suitable as supplementary cementitious materials

Feasibility of Using Low CO2 Concrete Alternatives in Extrusion-Based 3D Concrete Printing

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