Experimental investigation on the potential use of poly(vinyl alcohol) short fibers in fiber-reinforced cement-based composites

This study dealt with the potential use of poly(vinyl alcohol) fibers in cement-based matrices. Several variables were investigated including two types of fibers, two matrix mix compositions, the addition of a soluble poly(vinyl alcohol) powder to the mix, the temperature treatment of the cast and cured specimens, and the mechanical abrasion of the fibers. The fiber premix process was used throughout with a constant fiber volume h-action of 2%, except for one series of tests where the slurry infiltration process was tried. Three-point bending tests of the composites were carried out. High performance behavior, as characterized by multiple cracking and pseudo-strain hardening, was achieved in all tests. Modulus of rupture values, as high as 2300 psi (16 MPa), and ultimate toughness indices above 100 were observed. One of the key findings is that proper heat treatment of the cured composite can lead to increases of 100% to 200% in toughness or energy absorption capacity.