Dr. Alexander Pisch is currently a Senior Research Fellow at the public French National Research Organization CNRS. His is based at Laboratoire SIMaP (CNRS, Grenoble Alpes University, Grenoble Institute of Technology) in Grenoble (France) in the Thermodynamics & Process Optimization group. He holds a Master degree in Physics from Karlsruhe Institute of Technology (Germany), a PhD and a Habilitation in Materials Science from Grenoble Institute of Technology (France). He spent 10 years in the building materials industry as a senior project manager and as group leader of the Process & Environment group at the Corporate Research Center of Lafarge in Isle d’Abeau (France). His main research interest in the last 15 years are in field of novel, low CO2 clinkers and cements, thermodynamic properties of cement related compounds and phases, rotary kiln process modeling from a chemistry point of view and CO2 capture and mineralization.
Clinkers for low CO2 cements: thermodynamic aspects and process implications
There are currently three major types of clinkers to be used in low CO2 cements: classical OPC, sulfoaluminate based BYF-type and carbonatable clinkers based on wollastonite. The most promising route to reduce the environmental footprint in classical OPC systems is to manufacture and use blended cements with low clinker contents. To lower its content, a maximum short-term reactivity of the clinker is needed which necessarily implies high alite levels. The current status and knowledge on clinker reactivity will be reviewed together with a discussion on how to increase the amount and reactivity of alite in standard OPC clinkers. This includes the use of alternative, low CO2 raw materials from secondary materials and their impact on the clinker production process in a standard rotary kiln. In addition, theoretical and experimental specific heat consumptions will be presented for the various clinker types and discussed in view of the lowering of the CO2 footprint in the final products. Calculated data obtained from Calphad type thermodynamic calculations from the literature and new simulations will be compared to experimental data using differential scanning and high temperature drop calorimetry.