Characteristics of components in calcined clays and their influence on the efficiency of superplasticizers

Sposito, Ricarda; Beuntner, Nancy; Thienel, Karl‐Christian

doi:10.1016/j.cemconcomp.2020.103594

Cited by 45 publications

(14 citation statements)

References 64 publications

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“…Also, the BET surface area [19] varies for clay and mica minerals in a very wide range. While mica tends to have a moderate BET surface area, illitic and smectitic clays can exhibit BET surface areas of up to 100 m 2 /g [20]. For kaolinitic clays, the BET surface area depends on the degree of order of the kaolinite: more disordered kaolinites have a higher surface area.…”

Section: Physical Propertiesmentioning

confidence: 99%

“…Thus, particle characterization via the BET surface area as a criterion for the water demand and workability is neither trivial nor applicable. Overall, when calcined clays are used as SCM, the mineralogical characterization of the clay and the main physical parameters must not be ignored, and the total phyllosilicate content and the type of predominant phyllosilicate must considered [18].…”

Section: Physical Propertiesmentioning

confidence: 99%

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

Thienel,

Scherb,

Beuntner

et al. 2023

ce papers

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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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Section: Physical Propertiesmentioning

confidence: 99%

Section: Physical Propertiesmentioning

confidence: 99%

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

Thienel,

Scherb,

Beuntner

et al. 2023

ce papers

Self Cite

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“…Their results showed that the effect of calcined clay addition on the rheology of fresh mixtures is critical during the printing operation. The workability of fresh cementitious materials is generally reduced by the addition of calcined clay [108,125]. Because of the relatively low fineness, high specific surface area and layered structure of calcined clays, large quantities of water and superplasticizer are required in the blended mixtures [126][127][128][129].…”

Section: Composite Cementitious Systems Including Limestone-calcined ...mentioning

confidence: 99%

Sustainable materials for 3D concrete printing

Bhattacherjee

Basavaraj

Rahul

et al. 2021

Cement and Concrete Composites

147

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“…On the other hand, metakaolin has a positive charge in acidic pH due to the positively charged aluminates groups, and after the (pzc) at pH (4-5) the negative charge is predominant due to hydroxyl groups that attach to aluminate dehydroxylated sites [44]. Moreover, for the calcium carbonates, the surface charge is positive [45].…”

Section: Effect Of Thermal Treatmentmentioning

confidence: 99%

Moroccan clays for potential use as aluminosilicate precursors for geopolymer synthesis

et al. 2021

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Three Moroccan clays, denoted A1, A3 and A5, were sampled from the Fez region with the aim of potential use as aluminosilicate precursors for geopolymer synthesis. Each clay was subjected to calcination at 700 °C and analyzed using DTA/TG, grain size distribution measurements, XRD, and FTIR spectroscopy before and after heat treatment. The results showed that the three clays contain kaolinite in different proportions in addition to some associated minerals, such as quartz, hematite, calcite and dolomite. Heat treatment successfully activated the clay by the amorphization of kaolinite, which is essential for geopolymerization. Some other changes were observed in the associated minerals, especially carbonates, which partially or totally decomposed depending on the clay, while other minerals remained intact. The SBET and NBO values are in accordance with the degree of polymerization, and the obtention of consolidated materials is possible by alkali activation of the calcined clays.

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Characteristics of components in calcined clays and their influence on the efficiency of superplasticizers

Cited by 45 publications

References 64 publications

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

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

Sustainable materials for 3D concrete printing

Moroccan clays for potential use as aluminosilicate precursors for geopolymer synthesis

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