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Properties of Portland cement paste incorporated with loamy clay
Ravil Z. Rakhimov,Nailia R. Rakhimova,Albert R. Gaifullin,Vladimir P. Morozov 한국자원공학회 2017 Geosystem engineering Vol.20 No.6
Metakaolin which is calcined kaolin clay is being widely applied as supplementary cementitious materials for Portland cement. Due to their scarcity and high cost, calcined ubiquitous polymineral clays are actively studied as alternative to metakaolin. This article presents the study results of influence of calcined ground loamy clay on the properties of Portland cement paste. About 5–15% of loamy clay calcined at 400–600 °C and ground to 250–500 m2/kg were found to be more effective compared to metakaolin of specific surface area of 1200 m2/kg for improvement of compressive strength, water resistance, and increase in density of hardened Portland cement paste.
Calcined low-grade multimineral clays as supplementary cementitious materials: a feasibility study
Rakhimova Nailia R.,Rakhimov Ravil Z.,Bikmukhametov Artur R.,Morozov Vladimir P.,Eskin Aleksey A.,Gubaidullina Alfiya M. 한국자원공학회 2020 Geosystem engineering Vol.23 No.3
The relevance of calcined clays as sources with great potential for low-clinker blended Portland cements has significantly increased in recent decades. This article reports on a study to evaluate the potential of the two low-grade clays containing 9.37% of montmorillonite/chlorite and 12.26% of montmorillonite/kaolinite/chlorite accompanied with 29.73% and 32.79% of calcite, respectively, as supplementary cementitious materials. The clays after thermal treatment at 800°C demonstrated poor pozzolanic activity, slight increase in the C-(S)-H and decline in the CH contents, and decrease in the mechanical properties of the blended Portland cement pastes. The results showed that the investigated clays fall below the range of the clays suitable for pozzolan production.