Author(s): M. Lassinantti Gualtieri, V. Barbieri, C. Siligardi
Paper category: Proceedings
Book title: Proceedings of the 3rd International Conference on Bio-Based Building Materials ICBBM 2019
Editor(s): Mohammed SONEBI and Sofiane AMZIANE
e-ISBN: 978-2-35158-229-9
Publisher: RILEM Publications SARL
Publication year: 2019
Pages: 711 -712
Total Pages: 2
Language: English

Abstract: Porous magnesia-based cements were produced using vegetal flour (VF) as poreforming agent.
Starting from a reactive MgO powder, the effect of the organic powder on the hydration kinetics
with and without the addition of MgSO4 was investigated. The microstructures of the hardened
cements were studied by scanning electron microscopy and X-ray powder diffraction. It was found
that both MgSO4 and VF increased the induction period of the cement. MgSO4 had a particular
effect on the crystal habit of the hydrated phase (Mg(OH)2), leading to a change from nano-sized
spherules to interlocking lamellar crystals giving a mechanically resistant structure. Microstructural
characterizations of the hardened cements showed that the organic microgranules possibly acted
as support for heterogeneous nucleation of Mg(OH)2 crystals in the early stage of reaction. As the
reaction proceeds, the organic material reorganize, leaving pores with walls reinforced by
interlocking crystals of (Mg(OH)2. The high open porosity of the cement matrix (56 %) renders this
material suitable for subsequent carbonation and final use as binder in insulation boards.

Online publication: 2019
Publication type: full_text
Public price (Euros): 0.00

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