resumo
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.
palavras-chave
TITANIUM-DIOXIDE; PHOTOCATALYTIC DEGRADATION; CONCRETE; CEMENT; MICROSTRUCTURE; FUNDAMENTALS; NANO-SIO2; REMOVAL; DESIGN; FRESH
categoria
Construction & Building Technology; Engineering; Materials Science
autores
Senff, L; Modolo, RCE; Tobaldi, DM; Ascencao, G; Hotza, D; Ferreira, VM; Labrincha, JA
nossos autores
David Maria Tobaldi
Investigador
Guilherme Ascensão
Bolseiro de investigação
João António Labrincha Baptista
Professor Catedrático
Regina Célia Espinosa Modolo
Estudante de doutoramento
Victor Miguel Carneiro de Sousa Ferreira
Professor associadoagradecimentos
The authors acknowledge the financial support of the Brazilian agency CNPq (National Council for Scientific and Technological Development). The authors also thank Weber-Portugal and BASF for providing raw materials. D.M. Tobaldi is grateful to the ECO-SEE project (European Union's Seventh Framework Programme funding, grant agreement no 609234).