Biaxial Compressive Behavior of Fiber Reinforced Mortar
Michael A. Taylor, M. K. Tai, and Melvin R. Ramey
Appears on pages(s):
biaxial loads;compressive strength;deformation;fiber reinforced concretes;loads (forces);mortars (materials);reinforced concrete;research;stress-strain relationships.
About one hundred 2 in. (5 cm) cubical specimens were tested to establish the biaxial compressive strength envelopes for saturated fiber reinforced mortar (FRM). Two envelopes were obtained - one for proportonal loading and one for two-step sequential loading. Both solid and brush type loading platens were used and an investigation was made of the behavior when following a constant rate of loading versus a constant rate of straining. Tests indicated that FRM is weaker when subjected to the sequential load history. Comparisions were made with the envelopes for mormal weight concrete, NWC, and lightweight concrete, LWC. In a subsequent investigation stress-strain curves were obtained for one axis while samples were subjected to varying degreees of (constant) confining pressure on a perpindicular axis. All tests indicated that the FRM maintains good integrity even under uniaxial strains as high as 0.12, and biaxial strains of 0.40. Under suitable biaxial conditions, FRM behaves as an elasto-plastic material.