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Mechanisms and processes leading to changes in time in the properties of CFRC

โœ Scribed by Amnon Katz; Arnon Bentur

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
1001 KB
Volume
3
Category
Article
ISSN
1065-7355

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โœฆ Synopsis

A study of carbon fiber reinforced cement (CFRC) composite produced from a dense matrix (low water:cement ratio, increasing content of silica-fume) indicated that it might undergo an aging effect, exhibited by an increase in strength and toughness at early age, followed by a reduction thereafter. This aging effect was not accompanied by corrosion of the fiber or the matrix, and an analytical model was developed to account for it based on processes of physical interaction between the fiber and the matrix.

The processes identified and quantified were: (1) nonuniform fiber length induced by fiber breakage during mixing; (2) increase in fiber-matrix bond with time; and (3) flexural stresses induced in inclined fibers bridging matrix cracks, leading to fiber failure as the matrix becomes denser with age and with increase in silica-fume content. ADVANCED CEMENT BASED MATERIALS 1996, 3, 1-13 KEY WORDS:

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