Used of industrial minerals to improve portland cement’s sustainability

Title : Used of industrial minerals to improve portland cement’s sustainability

Abstract:

Portland cement is the major industrial material that is manufactured commercially all around the world. It is used in construction of building, bridges, roads, and others structures. However, the production of this industrial material lead to the release of significant amount of CO₂ and greenhouse gas in the atmosphere. One tone of its production release about one tone of CO₂ gas in the atmosphere.

There is therefore a great need to look for actions that will transform this cement to an environmentally friendly material. Since last decade, the used of mineral materials such as Metakaolin as pozzolanic material in concrete and mortars have received considerable attention. Cameroon possesses rich sites of kaolinite clay and bauxite that are used mainly in ceramic. The use of these minerals in Portland cement manufacture will also be another contribution to fight again environmental pollution. This work investigated two industrial minerals (a gibbsite riched kaolin and a bauxite) that were used to partially replaced cement to elaborated mortars that were submitted to pozzolanic and mechanical tests. The pozzolanic results show that Cameroonian clay possesses the highest pozzolanic activity by chapel test. The mechanical strength shows that Cameroonian clay gives high compressive strength at young age, but at 28 days both of them give the same compressive strength. The study showed that pozzolanic properties of the two minerals greatly increased with heating up to at 600 °C, and can also be used as ecofriendly supplementary cementitious materials in Portland for building construction.

Biography:

Chantale Njiomou Djangang received Master’s degree with thesis in chemistry (1995), Research Master’s degree (2000) and a PhD degree (2007) in Materials Science all from the University of Yaoundé I. In addition, she obtained a Teacher Training Certificate (1998) after two years at the Advanced Teacher’s Training School of the same University. She is a certified Master Teacher for Vocational Trainers and Program Development, having received training at KOREATECH, South Korea. She has teaching and research experience, progressively advanced through academic ranks at the University of Yaoundé I, serving from assistant in 2009 to Full Professor since 2022. Her work contributes in the constitution of data base on non-metallic minerals (clays, kaolin, laterite, limestone, feldspath rocks, pouzzolana, quartz and aggregates), their characteristics and transformation products. She Published 39 peer-reviewed articles.