Journal
CEMENT AND CONCRETE RESEARCH
Volume 40, Issue 10, Pages 1524-1530Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2010.06.006
Keywords
Particle size distribution; Fibre reinforcement; Flocculation of fibre cement
Funding
- TOLSA S.A.
- Ministerio de Educacion y Ciencia
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Sepiolite is used to increase thixotropy of cement slurries for easier processing, to prevent sagging and to provide a better final quality in the manufacture of fibre-reinforced cement products. However, the effect of sepiolite on flocculation and its interactions with the components of fibre cement are yet unknown. The aim of this research is to study the effects of sepiolite on the flocculation of different fibre-reinforced cement slurries induced by anionic polyacrylamides (A-PAMs). Flocculation and floc properties were studied by monitoring the chord size distribution in real time employing a focused beam reflectance measurement (FBRM) probe. The results show that sepiolite increases floc size and floc stability in fibre-cement suspensions. Sepiolite competes with fibres and clay for A-PAMs adsorption and its interaction with A-PAM improves flocculation of mineral particles. (C) 2010 Elsevier Ltd. All rights reserved.
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