The Effect of wollastonite micro-fibre aspect ratio on reinforcement of portland cement-based binders

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DOIResolve DOI: http://doi.org/10.1016/0008-8846(93)90083-L
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TypeArticle
Journal titleCement and Concrete Research
ISSN0008-8846
Volume23
Issue6
Pages14671479; # of pages: 13
SubjectCement and Concrete; Concrete
AbstractReinforcement of Portland cement-based binders with natural wollastonite microfibres has been further investigated with emphasis on the effect of fibre geometry on property modification. Wollastonite microfibres were separated into five different size groups before addition to cement and cement-silica fume matrices. The aspect ratio (length/ width) of the wollastonite microfibres was determined by scanning electron microscopy technique. Systematic experimentation including flexural tests, mercury intrusion, porosimetry, helium gas pycnometry, and isopropyl alcohol saturation measurement showed that, at constant microfibre content, the flexural strength and total porsity of the composites remained essentially unchanged and independent of the aspect ratio of the wollastonite microfibres. However, the volume of coarse pores, the pore size distribution, the flexural toughness and overall ductibility characteristics of the hydrated cement and cement-silica fume matrices were observed to change systematically as the aspect ratio of wollastonite micro-fibres was increased. A discussion of the differences in the observed properties is presented.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
IdentifierIRC-P-3190
NRC number35557
2983
NPARC number20328203
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Record identifier2b43378e-1f69-46a7-9dd5-5abf3e9986eb
Record created2012-07-18
Record modified2016-05-09
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