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On the Workability of Mortar and Concrete Mixtures containing Calcined Clay Blends

  • Calcined Clays can be used in mortar and concretes as a part of a binder (LC3) or as a Supplementary Cementing Material (SCM). The aim here is to sub-stitute fly ash as an additive in concrete recipes. A stable mixture between two regionally available clays, burnt together with a certain ratio of 60 : 40 wt.-% at 650-680°C, could be produced. Such Metaclays produced in larger amounts were investigated in different mortar and concrete mixtures. The production indicates an important problem with the workability of the fresh concrete mixtures. That`s why different superplastizers were tested. It could be found that especially a mixture between a PCE- based material and a special additive, developed for loam sands provides very good results. The workability increases from less than 200 mm slump on a value of about 300 mm. The combination of calcined clay materials and special developed superplastizer mixtures allows producing concrete with very different properties. It can be a closed system for the production of durable concreteCalcined Clays can be used in mortar and concretes as a part of a binder (LC3) or as a Supplementary Cementing Material (SCM). The aim here is to sub-stitute fly ash as an additive in concrete recipes. A stable mixture between two regionally available clays, burnt together with a certain ratio of 60 : 40 wt.-% at 650-680°C, could be produced. Such Metaclays produced in larger amounts were investigated in different mortar and concrete mixtures. The production indicates an important problem with the workability of the fresh concrete mixtures. That`s why different superplastizers were tested. It could be found that especially a mixture between a PCE- based material and a special additive, developed for loam sands provides very good results. The workability increases from less than 200 mm slump on a value of about 300 mm. The combination of calcined clay materials and special developed superplastizer mixtures allows producing concrete with very different properties. It can be a closed system for the production of durable concrete structures.show moreshow less

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Metadaten
Author: Klaus-Jürgen HüngerGND, Ingolf Sander, Natalia Zuckow
URL:https://www-docs.b-tu.de/fg-baustoffe/public/Calcined%20Clay%20blends-Revised%20Paper.pdf
Title of the source (English):Proceedings 3rd International Conference on Calcined Clays for Sustainable Concrete, 15. - 17. Oktober, Neu Delhi
Publisher:RILEM
Document Type:Conference publication peer-reviewed
Language:English
Year of publication:2019
Tag:Calcined clay mixtures, Supplementary cementing material, worka-bility, superplastizers mixtures, precast concrete elements
Volume/Year:I
First Page:207
Last Page:215
Faculty/Chair:Fakultät 6 Architektur, Bauingenieurwesen und Stadtplanung / FG Baustoffe und Bauchemie
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