Stress-Strain Properties of Fiber Reinforced Mortar in Compression
David A. Fanella and Antoine E. Naaman
Appears on pages(s):
composite materials; compressive strength; fiber reinforced con-cretes;glass fibers; metal fibers; mortars (material); polypropylene fibers;
With the increasing use of fiber reinforced concrete as a structural material, more information on its mechanical properties is needed. This paper attempts to characterize the stress-strain properties of fiber reinforced concrete mortar in compression. A comprehensive experimental program was designed to show how the addition of steel, slass, monofilament polypropylene, and twisted polypropylene fibers in various volume fractions affected the compressive stress-strain curves of three mortar matrices. In general, the fibers confined the material and delayed the crack propagation, thus producing an in-crease in the peak strain and the postpeak ductility. An analytical relationship is proposed to predict the complete stress-strain curve of fiber reinforced mortar in compression. Analytical expressions relating the key parameters of the stress-strain curve and the toughness index of the composite with the fiber reinforcing parameters are derived. They can be used as a first approximation in design.