High-performance concrete incorporating calcined kaolin clay and limestone as cement substitute

By Hongjian Du, S. Pang. 2020

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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.

Subfields: Civil and Structural Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/6708e997785d561ea94b6f3d2dc49526f8375470