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Fine sepiolite addition to air lime-metakaolin mortars

Published online by Cambridge University Press:  09 July 2018

S. Andrejkovičová ,
E. Ferraz ,
A. L. Velosa ,
A. S. Silva  and
F. Rocha
S. Andrejkovičová*
Affiliation:
Geosciences Department, Geobiotec Research Unit, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, Bratislava, Sk-845 36, Slovakia
E. Ferraz
Affiliation:
Civil Engineering Department, Geobiotec Research Unit, University of Aveiro, Campus Universitário de Santiago 3810-193 Aveiro, Portugal
A. L. Velosa
Affiliation:
Civil Engineering Department, Geobiotec Research Unit, University of Aveiro, Campus Universitário de Santiago 3810-193 Aveiro, Portugal
A. S. Silva
Affiliation:
Materials Department, Laboratório Nacional de Engenharia Civil, I.P. Av. do Brasil 101, 1700-066, Lisbon, Portugal
F. Rocha
Affiliation:
Geosciences Department, Geobiotec Research Unit, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
*
*E-mail: slavka@ua.pt
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Abstract

Lime-based mortars with admixtures of metakaolin (10, 20 and 30 wt.%) and fine sepiolite (5 wt.%) were prepared with the aim of facilitating their use as repair mortars in low-humidity conditions. The mechanical properties and the dynamic modulus of elasticity were studied after 28, 90 and 180 days of curing. With an increasing amount of metakaolin in lime mortars, improved mechanical strength was observed mainly after 90 days. Addition of fine sepiolite, due to its adsorption properties for storing water for later supply to the mortar system and its microfibrous morphology, led to an improvement of compressive and flexural strength of blended air lime/air lime-metakaolin mortars, espec ially at later ages of curing. Incorporation of fine sepiolite into air lime-metakaolin mortars resulted in comprehensive densification of the core of the mortars. Air lime mortar containing 5 wt.% of fine sepiolite and 20 wt.% of metakaolin appears to be an optimal admixture.

Keywords

limemortarmetakaolinsepiolitemechanical propertieselasticity modulus
Type
Research Article
Information
Clay Minerals , Volume 46 , Issue 4 , December 2011 , pp. 621 - 635
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2011

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