abstract
This paper reports on the use of design of experiments for the formulation of sulfobelite clinkers. Samples made of 30-70 wt.%C(2)S, 20-60 wt.%C(4)A(3)S. and 10-25 wt.%C(4)AF were formulated. The red mud generated from the Bayer process was used in some formulations as source of iron and aluminum. X-ray diffraction was used to define the high and low limits of phase compositions. Estimations of CO(2) emissions were also conducted. Derived cements (5 wt.% gypsum) were cured, and the temperature of hydration, compressive strength and density were determined. The Rietveld refinement showed that the percentages of phases in the clinkers are close to the expected ones. The presence of C(4)A(3)S is crucial to improve the mechanical strength at early ages. The use of red mud leads to the formation of C(3)A and then the derived cements show faster hydration. In addition, C(2)S is the major responsible for the generation of CO(2) emissions. (C) 2011 Elsevier Ltd. All rights reserved.
keywords
SULFOALUMINATE-BELITE CEMENT; PORTLAND-CEMENT; RED MUD; PERFORMANCE
subject category
Construction & Building Technology; Engineering; Materials Science
authors
Senff, L; Castela, A; Hajjaji, W; Hotza, D; Labrincha, JA
our authors
João António Labrincha Baptista
Full professoracknowledgements
The authors acknowledge the support of CAPES, Brazil. The authors also thank Alcoa Spain and Weber Portugal for providing raw materials for this work.