Lime-pozzolan injection grouts with ovalbumin and ethanol added as water-reducing agents: grout design and assessment of the mineralogical evolution

Author(s): Chiara Pasian, Michele Secco, Francesca Piqué, Gilberto Artioli, Sharon Cather
Paper category: Proceedings
Book title: Proceedings of the 5th Historic Mortars Conference
Editor(s):José Ignacio Álvarez, José María Fernández,Íñigo Navarro, Adrián Durán, Rafael Sirera
ISBN:978-2-35158-221-3
e-ISBN: 978-2-35158-222-0
Publisher: RILEM Publications SARL
Publication year: 2019
Pages: 1238-1250
Total Pages: 13
Language : English

Abstract: Non-structural lime-pozzolan injection grouts with water-reducing agents were designed for
the stabilisation of delaminated historic plasters in water-sensitive situations, such as
plasters contaminated with soluble salts. Water used as suspension medium in a grout can
activate and mobilise salts, potentially jeopardising the original materials. Two water-
reducing components were considered for the fluid mixture: (i) ethanol, as a partial
substitute for water, is a less effective solvent for soluble salts; (ii) ovalbumin is a protein
found in egg white, which has been studied as a water-reducer. The evolution of the
chemical reactions in grout samples was assessed by X-ray powder diffraction (XRPD)
coupled with quantitative phase analysis (QPA) by means of the Rietveld method.
Microstructural and microchemical analyses were performed by scanning electron
microscopy-energy dispersive microanalysis (SEM-EDS) on cross-sections of grouts aged 150
days, to characterise the packing geometry of the material and the microchemical profile.
The influence of both ethanol and ovalbumin in the formation of mineral phases and on the
material internal structure is here discussed, as well as how this affects other properties of
the grouts.

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