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9Durability of Hybrid Polypropylene-Glass Fibre
ELSEVIER
PII:SO958-9465(97)00075-9
Cement and Concrete Composites 20 (1998) 19-84
0 1998 Elsevier Science Ltd. All rights resewed
Printed in Great Britain
0958-9465/98/$19.00
G. XQ* S. Magnani” D. J. Hannantb
“Fibronit S.R.L. Broni (PV), Italy
‘Department of Civil Engineering, University of Surrey, Guildford, Surrey, UK
(Received 21 August 1997; accepted 12 December 1997)
Durability of Hybrid Polypropylene-Glass Fibre
Cement Corrugated Sheets
Abstract
Two types of fibre cement corrugated roofing
sheets, one being a hybrid containing fibrillated
polypropylene networks and alkali resistant glass
fibres, and the other reinforced solely by the fibril-
lated polypropylene networks, have been exposed
to natural weather for six and ten years, respec-
tively. Flexural test results indicate that, for these
Rxposure periods, the strength and toughness for
both types of sheets has been little ajfected. A
20% increase in flexural peak load was found for
the hybrid polypropylene-glass jibre cement sheets.
0 1998 Elsevier Science Ltd. All rights reserved.
Keywords: Fibrillated polypropylene networks;
glass fibres; hybrid sheets; PP sheets; natural
weathering; load-deflection curves; durability
INTRODUCTION
The concept of utilising layers of fibrillated
polypropylene film, opened up to form net-
works, to fabricate fibre cement thin sheeting
was developed by the University of Surrey in
the late 1970~‘*~. The use of networks of fibril-
lated polypropylene film can yield a composite
with high energy absorbing capacity, compared
with other fibre cement sheet materials avail-
able in the market.
*Correspondence to G. Xu at: Institute for Research in
Construction, Canadian National Research Council,
Ontario KlA OR Canada.
In order to manufacture the material in large
volumes, an industrial process, the Reticemf
process, in which fibrillated polypropylene net-
works are fabricated into a semi-dry cement
matrix with subsequent vacuum dewateri
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