Mechanical properties of concrete made with calcined clay: a review by RILEM TC-282 CCL

• Published in: Materials and structures Vol. 56; no. 4
• Main Authors: Joseph, Shiju, Dhandapani, Yuvaraj, Geddes, Daniel A., Zhao, Zengfeng, Bishnoi, Shashank, Vieira, Manuel, Martirena, Fernando, Castel, Arnaud, Kanavaris, Fragkoulis, Bansal, Tushar, Riding, Kyle A.
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.05.2023; Springer Nature B.V
• Subjects: Bonding strength; Building construction; Building Materials; Calcinated Clays as Supplementary Cementitious Materials; Cement; Civil Engineering; Clay; Compressive strength; Concrete properties; Engineering; Ettringite; High temperature; Kaolinite; Limestone; Machines; Manufacturing; Materials Science; Mechanical properties; Metakaolin; Portland cements; Processes; Property development; RILEM TC 282-CCL; RILEM TC 282-CCL: Calcined Clays as Supplementary Cementitious Materials; Roasting; Solid Mechanics; Tensile strength; Theoretical and Applied Mechanics; Thermal properties; Mechanical properties; Calcined clay; Bond
• ISSN: 1359-5997; 1871-6873
• DOI: 10.1617/s11527-023-02118-8

A review of the mechanical property development of concrete containing calcined clay was performed. A comparison of compressive and tensile strength results showed that concrete can be made to have equivalent or higher strength as an ordinary portland cement (OPC) system with up to 30% calcined clay or 50% blend of calcined clay and limestone fines in a limestone calcined clay cement (LC 3 ) system, as long as the kaolinite content in the clay used is above 40%. Most of the strength development in these systems occurs during the first 7 days, making extended wet curing not necessary in these systems. Calcined clay systems are subject to the cross-over effect because of the high solubility of ettringite and lower cement degree of hydration at elevated temperatures. Concrete creep and shrinkage were found to be a function of the clay kaolinite content and replacement level. Bond strength was improved by the use of up to 20% metakaolin.