Ultra high strength fiber reinforced concretes were produced using aramid fibers having differ- ent shapes and sizes to investigate their fresh and mechanical properties after hardening, including compres- sive strength, as well as post-cracking strength from notched beams. These tests…
Ultra high strength fiber reinforced concretes were produced using aramid fibers having differ- ent shapes and sizes to investigate their fresh and mechanical properties after hardening, including compres- sive strength, as well as post-cracking strength from notched beams. These tests revealed that a small fiber di- ameter leads to low fluidity while fresh, inhibiting inclusion of fibers in an appreciable amount, while a short fiber length allows inclusion of a substantial amount of fibers, leading to excellent mechanical properties after hardening. Bundled fibers were found to be effective in improving the softening properties of concrete.