Abstract
Three metakaolins are evaluated for use as supplementary cementitious materials in cement-based systems. The metakaolins vary in mineralogical composition and in fabrication (traditional and flash calcination), but are quite similar in their surface area (16–19 m2/g), but are quite similar in mineralogical composition. Performance of metakaolin mixtures will be compared to two control mixtures (standard concrete for foundation C40/50 and high performance concrete C60/75). In this study, the properties of fresh concrete and the mechanical and durability properties of hardened concrete will be examined. The rheological behaviour are aimed to determine the effect of metakaolin on mixture workability. Compressive, tensile and flexural strength and elastic modulus will be measured at various concrete ages. The influence of metakaolin on durability is assessed through rapid chloride migration and carbonation measurements. For high performance concrete mixtures, drying and autogenous shrinkage will be monitored and creep measurements are performed and compared.
Highlights
During the past three decades, the development of high strength and high performance concretes has beneficiated of the use of supplementary cementitious materials such as fly ash, silica fume and ground granulated blast furnace as judicious cement replacement materials: these can significantly enhance the strength and durability characteristics of concrete in comparison with ordinary Portland cement (OPC)
CO2 footprint depends a lot of the calcination process, and can vary largely from a process to another one, while it remains very low for silica fume (25 kg CO2 /t) since it is considered as a waste material
MKA and MK1 concretes have been tested for a larger variety of properties in order to compare two metakaolins produced with the same calcination process
Summary
During the past three decades, the development of high strength and high performance concretes has beneficiated of the use of supplementary cementitious materials such as fly ash, silica fume and ground granulated blast furnace as judicious cement replacement materials: these can significantly enhance the strength and durability characteristics of concrete in comparison with ordinary Portland cement (OPC). CO2 footprint depends a lot of the calcination process, and can vary largely from a process to another one (from 15 to 250 kg CO2 /t), while it remains very low for silica fume (25 kg CO2 /t) since it is considered as a waste material These latter costs and CO2 footprints are transport neutral. Material (SCM) in terms of mechanical, durability and dimensional stability performance For this purpose, two types of concrete are considered in this research: high performance concrete (HPC, C60/75) and medium strength concrete (C40/50). Two types of concrete are considered in this research: high performance concrete (HPC, C60/75) and medium strength concrete (C40/50) For both concrete, the objective is to highlight that MK can enhance concrete properties.
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