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High-performance concrete incorporating calcined kaolin clay and limestone as cement substitute
Highlights Calcined clay and limestone are used to replace cement in high-performance concrete. Calcined clay starts its pozzolanic reaction prior to the synergy with limestone. Higher autogenous shrinkage was recorded for blended cement mixes. After 1-week, blended mixes exhibited similar strength with the reference mix. Transport of moisture and liquid is greatly hindered by the refined microstructure.
Abstract This paper presents a comprehensive study on the properties of high-performance concrete produced with calcined kaolin clay and limestone at cement replacement level of 30% and 45% respectively. A medium-grade kaolin clay was used for thermal treatment at 800 °C. The hydration, strength, shrinkage and transport properties were assessed up to 6 months. Calorimetry, XRD and TG results revealed that the pozzolanic reaction of calcined clay and its synergetic effect with limestone would occur within the first week. Higher autogenous shrinkage was clearly noted. The produced C-A-S-H gels and carbonaluminate phases could effectively enhance the compressive strength and elastic modulus from 7 days onwards. Meanwhile, concrete’s resistance against moisture and liquid ingress was found to significantly increase as a result of the more tortuous pathways. The comparable mechanical properties and superior durability performances confirm the viability of realizing high-performance concrete using high content of clay and limestone.
High-performance concrete incorporating calcined kaolin clay and limestone as cement substitute
Highlights Calcined clay and limestone are used to replace cement in high-performance concrete. Calcined clay starts its pozzolanic reaction prior to the synergy with limestone. Higher autogenous shrinkage was recorded for blended cement mixes. After 1-week, blended mixes exhibited similar strength with the reference mix. Transport of moisture and liquid is greatly hindered by the refined microstructure.
Abstract This paper presents a comprehensive study on the properties of high-performance concrete produced with calcined kaolin clay and limestone at cement replacement level of 30% and 45% respectively. A medium-grade kaolin clay was used for thermal treatment at 800 °C. The hydration, strength, shrinkage and transport properties were assessed up to 6 months. Calorimetry, XRD and TG results revealed that the pozzolanic reaction of calcined clay and its synergetic effect with limestone would occur within the first week. Higher autogenous shrinkage was clearly noted. The produced C-A-S-H gels and carbonaluminate phases could effectively enhance the compressive strength and elastic modulus from 7 days onwards. Meanwhile, concrete’s resistance against moisture and liquid ingress was found to significantly increase as a result of the more tortuous pathways. The comparable mechanical properties and superior durability performances confirm the viability of realizing high-performance concrete using high content of clay and limestone.
High-performance concrete incorporating calcined kaolin clay and limestone as cement substitute
Du, Hongjian (author) / Pang, Sze Dai (author)
2020-07-05
Article (Journal)
Electronic Resource
English