Concretes with Calcined Clay and Calcined Shale: Workability, Mechanical, and Transport Properties

Cordoba, Gisela; Zito, Silvina Vanessa; Sposito, Ricarda; Rahhal, Viviana Fátima; Tironi, Alejandra; Thienel, Karl‐Christian; Irassar, Edgardo F.

doi:10.1061/(asce)mt.1943-5533.0003296

Cited by 27 publications

(11 citation statements)

References 35 publications

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“…Martirena-Hernandez et al [39] identified that cement pastes with calcined kaolinite clays had lower capillary porosity than PC reference samples, while calcined illite or montmorillonite clay-containing cement pastes had higher capillary porosity than PC. A comparison between cements produced with 25% content of calcined kaolinite or illite clays with similar amorphous content of about 56% was carried out by Cordoba et al [64]. This study found that kaolinite clay was more effective in refining pore structure than calcined illite shale.…”

Section: Evolution Of Porosity In Calcined Clay Blendsmentioning

confidence: 84%

Hydration and mixture design of calcined clay blended cements: review by the RILEM TC 282-CCL

et al. 2022

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The RILEM technical committee 282-CCL: Calcined Clays as Supplementary Cementitious Materials, investigates all the aspects related to calcined clays, from clay exploration and characterization to calcination process, hydration reactions and concrete properties. This white paper focuses on the hydration mechanisms of calcined clay-blended Portland cements, covering both 1:1 and 2:1 calcined clays. The pozzolanic reaction of calcined clay is detailed, and the main reaction products are described. The differences observed depending on the clay type are also discussed, as well as the potential influence of the secondary phases present in calcined clay. The factors controlling and limiting the reaction of calcined clay are investigated, evidencing the role of porosity saturation and refinement of the microstructure. The complete characterisation of the hydration of calcined clay cements is made possible by the determination of the reaction degree of calcined clay. Several methods are compared to estimate the extent of calcined clay reaction. The influence of clinker and limestone mineralogy are also discussed. Finally, guidelines for optimising the mixture design of calcined clay blended cements are provided, with special attention to sulphate adjustment and clinker factor.

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Section: Evolution Of Porosity In Calcined Clay Blendsmentioning

confidence: 84%

Hydration and mixture design of calcined clay blended cements: review by the RILEM TC 282-CCL

et al. 2022

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“…Figure 1 shows the relative porosity (porosity/porosity of reference Portland cement) at different replacement levels measured using mercury intrusion porosimetry (MIP), vacuum saturation and 1 H NMR. The data was compiled from [15,23,24,32,40,45,[50][51][52][53][54][55][56][57][58][59][60][61][62][63]. The figure distinguishes binary blends with calcined clay (triangles) and ternary blends with calcined clay-limestone combination (shaded squares).…”

Section: Analysis Of Alterations In Porositymentioning

confidence: 99%

“…Both kaolinitic and non-kaolinitic clays have been used to produce binary blends [40] and ternary blends with limestone [41]. While the pozzolanic reaction, controlled by clay type and calcination, improves the pore structure and transport properties, the reduction in the portlandite content reduces the capacity of the concrete to react with CO2 [42].…”

Section: Introductionmentioning

confidence: 99%

Durability performance of binary and ternary blended cementitious systems with calcined clay: a RILEM TC 282-CCL, review

et al. 2022

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“…The critical pore entry declined with increasing metakaolinite content [61]. No clear difference [62] or even an increase of the critical pore entry [63] was reported for blended binders with calcined 2:1 illite dominated clays compared to the reference OPC system.…”

Section: Microstructurementioning

confidence: 85%

1:1 or 2:1 ‐ Does it matter for calcined clay as supplementary cementitious material?

Thienel,

Scherb,

Beuntner

et al. 2023

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Calcined clays are the most promising future supplementary cementitious material which are capable of replacing fly ashes and blast furnace slag on the long run due to their potential to achieve high cement replacement levels and their global availability. In the last decade most research has focused on calcined clays rich in the 1:1 kaolinite. Clay with less than 20 to 25 % kaolinite were seen as worthless. Even the content of 2:1 phyllosilicates in the kaolinitic clays was neglected and not even mentioned although especially these clays are dominant in areas like central and northern Europe. Here, highly kaolinitic clays are rare or used by other industries leading to high prices. This paper is based on published works and highlights whether information obtained for calcined 1:1 dominated clays can be applied for calcined 2:1 dominated clays or not and where further research is needed.

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Concretes with Calcined Clay and Calcined Shale: Workability, Mechanical, and Transport Properties

Cited by 27 publications

References 35 publications

Hydration and mixture design of calcined clay blended cements: review by the RILEM TC 282-CCL

Hydration and mixture design of calcined clay blended cements: review by the RILEM TC 282-CCL

Durability performance of binary and ternary blended cementitious systems with calcined clay: a RILEM TC 282-CCL, review

1:1 or 2:1 ‐ Does it matter for calcined clay as supplementary cementitious material?

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