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Fibre-Cement Paste Transition Zone

Published online by Cambridge University Press:  21 February 2011

Vahan Agopyan  and
Holmer Savastano Junior
Vahan Agopyan
Affiliation:
Escola Politécnica, University of São Paulo, 05508-900 São Paulo, SP, Brazil
Holmer Savastano Junior
Affiliation:
Faculdade de Zootecnia e Engenharia de Alimentos, University of São Paulo, 13630-000 Pirassununga, SP, Brazil
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Abstract

The characteristics of fibres and paste of ordinary Portland cement transition zone are analysed and correlated to the mechanical properties of the produced composites. The water-cement ratio of the matrix varies from 0.30 to 0.46 and the age of the specimens varies from 7 to 180 days. Composites of vegetable fibres (coir, sisal and malva) are compared with those of chrysotile asbestos and polypropylene fibres. The analysis is made by backscattered electron image (BSEI) and energy dispersive spectroscopy (EDS). Mechanical tests evaluate the composite tensile strength and ductility.

Mainly for vegetable fibre composites the transition zone is porous, cracked and rich in calcium hydroxide macrocrystals. These results are directly associated with the fibre-matrix bonding and with the composite mechanical performance. Further studies considering the impact performance of the composites compare the porosity of the transition zone with the toughness of the composites.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 370: Symposia Va/Vb – Microstructure of Cement-Based Systems/Bonding and Interfaces in Cement... , 1994 , 479
Copyright
Copyright © Materials Research Society 1995

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