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5. Green geopolymeric concrete using grits for applications in construction

Author

João A. Labrincha, Manfredi Saeli, Rui M. Novais, Maria Paula Seabra, SAELI, Manfredi, Novais, R.M., Seabra, M.P., and Labrincha, J.A.

Subjects
Aggregate (composite), Materials science, Waste management, 020209 energy, Mechanical Engineering, 0211 other engineering and technologies, Settore ICAR/10 - Architettura Tecnica, Biomass, 02 engineering and technology, Grit, Mechanics, Condensed Matter Physics, Geopolymeric concrete, Mix design, Geopolymer, Sustainable construction, Kraft process, Biomass fly-ash, Mechanics of Materials, Fly ash, 021105 building & construction, 0202 electrical engineering, electronic engineering, information engineering, General Materials Science, Construction, Waste disposal
Abstract

This work investigates the production a green geopolymer-based concrete for a sustainable construction material using biomass wastes from a kraft pulp industry: fly ash (as main alumina-silicate source) and grits (as aggregate). Moreover, a simple, reproducible, ambient temperature, and low-cost manufacture is followed. Mix design aims to maximize wastes incorporation and optimize the mechanical performance. Preliminary tests indicate that the used wastes may be successfully employed to produce green geopolymeric concretes with satisfying mechanical performance (up to 18 MPa), according to the European standards. Furthermore, they represent a viable solution to reduce the environmental footprint associated with waste disposal.

Published
2018

6. Fully quantitative X-ray characterisation of Evonik Aeroxide TiO2 P25®.

Author

Tobaldi, D.M., Pullar, R.C., Seabra, M.P., and Labrincha, J.A.

Subjects
*TITANIUM dioxide, *PHOTOCATALYSIS, *DISLOCATIONS in crystals, *X-ray diffraction, *MICROSTRUCTURE, *AMORPHOUS substances
Abstract

Abstract: Photocatalysis with TiO2 is one of the most promising methods for combatting environmental pollution. Of commercially available photocatalysts, Evonik Aeroxide (formerly Degussa) P25® titania is probably the most extensively used. In this communication, we quantitatively characterise the full phase composition (both crystalline and amorphous content) of P25®, as well as the microstructure of individual phases (crystalline domain size distribution and dislocation density). This was achieved with advanced X-ray diffraction (XRD) methods: Rietveld-RIR and whole powder pattern modelling (WPPM). Quantitative phase analysis (QPA) showed the precise composition of P25 to be 76.3wt% anatase, 10.6wt% rutile and 13.0wt% amorphous, and microstructural details are given for the two crystalline phases. [Copyright &y& Elsevier]

Published
2014
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