The influence of TiO2 nanoparticles and poliacrilonitrile fibers on the rheological behavior and hardened properties of mortars
authors Senff, L; Modolo, RCE; Tobaldi, DM; Ascencao, G; Hotza, D; Ferreira, VM; Labrincha, JA
nationality International
journal CONSTRUCTION AND BUILDING MATERIALS
author keywords Nano-titania powder; PAN fiber; Rheology; Flow table; Mortars; Design of experiments
keywords TITANIUM-DIOXIDE; PHOTOCATALYTIC DEGRADATION; CONCRETE; CEMENT; MICROSTRUCTURE; FUNDAMENTALS; NANO-SIO2; REMOVAL; DESIGN; FRESH
abstract This experimental research evaluates the individual and combined influence of poliacrilonitrile (PAN) fibers and nanoTiO(2) (nT) particles on the fresh and hardened properties of mortars up to 28 days. Samples with 0-0.125 wt% PAN, 0-1.0 wt% nT and 0.83-0.87 W/B were prepared. Samples with similar workability showed distinct rheological behavior along time and the yield stress was the best rheological parameter to represent such variations. The very high specific surface area and wettability of nT was dominant over the one induced by PAN fibers and severely limited the rheological behavior maintenance up to 0.050PAN + 1.00nT sample. The physical properties (apparent density, water absorption, apparent porosity) indicate that PAN is dependent on the correct correlation with nT particles. In addition, the optimal concentration of PAN is about 0.05 wt% to the flexural and compressive strength, while the most active NOx degradation reached similar to 77% to those containing 1 wt% nT, regardless the concentration of PAN. (C) 2014 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0950-0618
year published 2015
volume 75
beginning page 315
ending page 330
digital object identifier (doi) 10.1016/j.conbuildmat.2014.11.002
web of science category Construction & Building Technology; Engineering, Civil; Materials Science, Multidisciplinary
subject category Construction & Building Technology; Engineering; Materials Science
unique article identifier WOS:000348255700038
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