Potable water filtration sludge: Use as set retarder in one-coat plastering mortars
authors Raupp-Pereira, F; Silva, L; Segadaes, AM; Hotza, D; Labrincha, JA
nationality International
journal CONSTRUCTION AND BUILDING MATERIALS
author keywords mortar admixtures; set retarding; workability; potable water filtration sludge
keywords PORTLAND-CEMENT; FLY-ASH; CONCRETE; BEHAVIOR; GYPSUM
abstract This work describes the study of the potential use of the sludge generated in potable water filtration/cleaning operations (waste material) as set retarder and workability-aid in rendering/plastering mortars. A commercial mortar was used as reference and several formulations were investigated, containing the waste material and sodium phosphate instead of sodium or calcium phosphate enriched bentonites, traditionally used as set retarder and workability-aid in cement based compositions. Sodium tri-polyphosphate was also tested alone for the same purpose. Fresh mortars were prepared with a water-to-cement weight ratio of 1.1 and a sand-to-cement weight ratio of 4:1. The results obtained in set time tests suggest that the retarding effect is associated with the presence of sodium ions. The same set delay can be obtained even with lower contents of the new waste-based additive (0.25-0.50 wt%), but the workability window tends to be narrower than that observed with the use of sodium enriched bentonite. The potable water filtration sludge can be a strong candidate in this application, with economical and environmental benefits. (c) 2005 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0950-0618
year published 2007
volume 21
issue 3
beginning page 646
ending page 653
digital object identifier (doi) 10.1016/j.conbuildmat.2005.12.005
web of science category Construction & Building Technology; Engineering, Civil; Materials Science, Multidisciplinary
subject category Construction & Building Technology; Engineering; Materials Science
unique article identifier WOS:000243739700024
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journal analysis (jcr 2019):
journal impact factor 4.419
5 year journal impact factor 5.036
category normalized journal impact factor percentile 83.285
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