6 Pages

Improving the frost resistance of short-fiber-mixed shotcrete by hollow microspheres

F. Taguchi & M. Takahashi N. Kishi & Y. Kurihashi

ABSTRACT: The frost resistance of concrete mixed with short fibers is generally lower than that of conventional concrete because good-quality entrained air is lost during shotcreting. As a measure against such deterioration, this paper presents a method of mixing in hollow microspheres (vinyl chloride acrylonitrile, density: 0.037 g/cm3; diameter: around 50 μm) with diameters similar to those of entrained air bubbles (50-500 μm), and verifies its effects. The results indicate the possibility of significantly improving frost resistance of short-fibermixed conctrete by adding hollow microspheres.