Thermal analysis of high‐performance mortar containing burnt clay shale as a partial portland cement replacement in the temperature range up to 1000 °C

Abstract

SUMMARYClay shale is a specific type of material that contains a large amount of kaolinite. Burnt clay shale belongs to a large group of pozzolans, and its pozzolanic properties are activated after burning at temperatures similar to those when kaolinite is transformed into metakaolin. In this study, fine powder of burnt clay shale was used for the design of a high-performance mortar as a partial replacement for portland cement up to 60 wt.%. The prepared specimens were subjected to a thermal analysis by using differential scanning calorimetry, thermogravimetry, and thermodilatometry. The investigation was performed in the temperature range 25-1000°C. The basic physical and mechanical properties were studied as well. It was demonstrated that it is possible to design and produce a high-performance mortar containing fine burnt clay shale powder and that an appropriate amount of this replacement is up to 20 wt.%.

Effect of elevated temperatures on concrete incorporating ferronickel slag as fine aggregate

“…Generally, 3 different mechanisms are responsible for the degradation of concrete in fire exposure. These are decomposition of hydration products, development of internal vapour pressure, and the thermal incompatibility of concrete ingredients . Therefore, the assessment of residual strength of concrete after high‐temperature exposure is of utmost importance.…”