By Colin D. Johnston

This ebook summarizes and simplifies the result of a substantial physique of analysis and useful adventure with a variety of fiber-reinforced cementitious composites.

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Additional info for Fiber-reinforced cements and concretes

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Intrinsic Fiber Properties Any type of fiber effective for reinforcing relatively weak and brittle cementitious matrices must have appropriate intrinsic material properties as follows: Tensile Strength—The fiber must be much stronger than the matrix since the effective loadbearing area of a typical fiber amount in the composite, 1–5% by volume, is much less than the corresponding area for the matrix, 95–99%. Ductility or Elongation—The fiber must be able to withstand strains well in excess of the matrix cracking strain in order to provide significant toughening.

5, upper), while Naaman and Shah’s (1976) results for a 13 mm embedded length vary with fiber diameter. When both sets of results are considered in terms of fiber embedment aspect ratio, it seems clear that 22 Fiber-Reinforced Cements and Concretes for smooth rigid steel monofilaments the effect of fiber inclination on peak fiber load is negligible at low fiber embedment aspect ratios and becomes increasingly significant at higher fiber embedment aspect ratios. This is consistent with the importance of fiber aspect ratio previously discussed.

5. Material Processing Annealing and cold-working processes alter the yield and ultimate tensile strengths, elongation, and bending stiffness of steel fibers. , 1992). Chemical additives and mechanical working alter the strength, elongation and elastic modulus of some polymeric fiber materials. Stretching and heat treatment have been used to increase the elastic modulus and reduce the elongation of polypropylene, and were combined with surface treatment to improve adhesive bond with cement paste (Krenchel and Jensen, 1980).

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