THE INFLUENCE OF POLYPROPYLENE FIBERS AND AGGREGATE GRADING ON THE PROPERTIES OF DRY-MIX SHOTCRETE

This paper presents the results of tests performed to evaluate the inf luence of the use of polypropylene fibers, of the grading of the fine aggregate, and of the coarse to fine aggregate proportion on various p roperties of dry-mix shotcrete. These results indicate that the use of polypropylene fibers (2 or 4 kg/m(3)) does not significantly modify t he mechanical strength, the drying shrinkage, and the frost/salt durab ility of dry-mix shotcrete. An increase in the proportion of coarse ag gregate, and an increase of the fineness modulus of the fine aggregate , however, appears to improve the frost/salt durability.