Collated fibrillated polypropylene

R.F. Zollo, J.A. liter and G.B. Bouchacourt, Plastic and drying shrinkage in concrete containing collated fibrillated polypropylene fibre , in R.N. Swamy, R.L. Wagstaffe and D.R. Oakley (eds) Developments in Fibre Reinforced Cement and Concrete, Proc. RILEM Symp., Sheffield, 1986, paper 4.5. 

Figure 10.2 Collated fibrillated polypropylene fibres produced by Fibermesh before and after mixing (after Mindess and Vondran [8] and Bentur et al. [9]) (a) Collated fibrillated polypropylene fibres prior to mixing (b) Open bundles of fibrillated polypropylene fibres.

R.F. Zollo, Collated fibrillated polypropylene fibers in FRC , in G.C. Hoff (ed.) Fiber Reinforced Concrete, SP-81, American Concrete Institute, Farmington Hills, Ml, 1984, pp. 397-409,... 

In applications in which the fibrillated polypropylene is mixed as short fibres in a cementitious matrix, the fibrillation plays an additional important role. It provides an initial structure of bundled, collated filaments, cross linked together. This bundle can disperse uniformly in the matrix as filaments (fibrils) which are separated from the collated-fibrillated fibre during the mixing operation (Figure 10.2(c) and (d)). 

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