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Download Fiber-reinforced cements and concretes by Colin D. Johnston PDF

By Colin D. Johnston

This ebook summarizes and simplifies the result of a substantial physique of study and sensible event with quite a lot of fiber-reinforced cementitious composites.

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Extra info for Fiber-reinforced cements and concretes

Example text

Since the total weight rather than the absolute size reflects the material cost of the fibers, the question arises whether a large number of small fibers offers better reinforcing effectiveness than the same weight of a smaller number of large fibers with the same aspect ratio. For example, in one testing program (Johnston and Skarendahl, 1992) involving five commercially available but not geometrically similar types of steel fiber, the number of fibers ranged from 4000 to 100,000 per kilogram.

The secondary but significant importance of fiber aspect ratio, which corresponds to length for multifilament glass strands, is illustrated by the increase in ductility and toughness associated with increased fiber pullout resistance at longer fiber lengths (Fig. 4) (Majumdar and Laws, 1991). In general, the stress-strain curves in Fig. 4 show significant improvement in first-crack strength and substantial toughness thereafter with a positive slope to ultimate sometimes characterized as strain-hardening behaviour, except when fiber breakage rather than pullout dominates and toughness is adversely affected (Fig.

Steel fiber bundles held together with water-soluble glue that allows separation during mixing are widely available (Fig. 13). Partial splitting (fibrillation) to produce multifilament mesh-like strands with secondary crosslinks that are intended to separate into branched monofilaments during mixing with improved mechanical bond due to the branching is characteristic of fibrillated polypropylene (Fig. 13). 3. Surface Deformation and Texture Surface deformation can improve the components of pullout resistance due to friction and mechanical interlock for any type of fiber, and has been used mainly to alter the performance of straight uniform fibers without special end anchorage, such as steel (ACI Committee 544, 1996), polyethylene (Kobayashi and Cho, 1981) and nylon (Li, Wang and Backer, 1990).

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