Effect of sepiolite on the flocculation of suspensions of fibre-reinforced cement

Journal Article · Fri Oct 15 04:00:00 EDT 2010 · Cement and Concrete Research

DOI:https://doi.org/10.1016/j.cemconres.2010.06.006· OSTI ID:21483633

Jarabo, Rocio; Fuente, Elena; Moral, Ana; Blanco, Angeles ^[1]; Izquierdo, Laura ^[2]; Negro, Carlos ^[1]

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1. Chemical Engineering Department, University Complutense of Madrid. Avda. Complutense s/n, Madrid 28040 (Spain)
2. I-D Department, TOLSA S.A., Rd. Vallecas-Mejorada del Campo, Km 1600, Madrid 28031 (Spain)

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.

• OSTI ID: 21483633
• Journal Information: Cement and Concrete Research, Journal Name: Cement and Concrete Research Journal Issue: 10 Vol. 40; ISSN 0008-8846; ISSN CCNRAI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BUILDING MATERIALS
CEMENTS
CLAYS
DISPERSIONS
FIBERS
FLOCCULATION
MATERIALS
MINERALS
MIXTURES
PRECIPITATION
REINFORCED MATERIALS
SEPARATION PROCESSES
SEPIOLITE
SILICATE MINERALS
SLURRIES
SUSPENSIONS
THIXOTROPY