Effect of Calcined Red Mud Addition on the Hydration of Portland Cement

Abstract:

The red mud (RM) is a solid waste derived from the processing of bauxite ore to produce alumina and it is considered a hazardous waste due to its high pH. This paper describes the use of mud untreated and after calcination at distinct temperatures (450, 650, and 1000°C) attempting to improve its reactivity. The Portland cement was replaced up to 30 wt% red mud, and its addition changed the hydration process, evaluated by calorimetric studies of early hydration and setting time. By comparing with the reference mixture (without red mud), the obtained results confirm the potential of the red mud to be used as pozzolanic additive to cementitious materials. Temperature of hydration was monitored by a quasi-adiabatic calorimeter (Langavant). The hydration temperature increases with RM addition, particularly if calcined in the same interval (450-650°C). In this condition, the hydration process is accelerated.

• Periodical: Materials Science Forum (Volumes 727-728)
• Pages: 1408-1411
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.727-728.1408
• Online since: August 2012
• Authors: Daniel Véras Ribeiro, João A. Labrincha, Márcio Raymundo Morelli
• Keywords: Calcination, Hydration, Portland Cement, Red Mud, Setting Time

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