Abstract
Concrete or mortar is one of the fragile materials that possess low tensile strength and relatively high compressive strength. The addition of fibers randomly distributed in the matrix, substantially improves their mechanical performance such as post-cracking strength in compression, strength/toughness (energy required up to failure) in bending, impact strength, fatigue strength and also wear resistance. Fiber reinforced concrete/mortar (FRC/FRM) had been gaining various application fields; tunnel support, dam site, river facilities, road pavement and floor in building.
In this study, uniaxial tension tests of steel/PET fiber reinforced mortar (SFRM/PET-FRM) were conducted by servo-controlled testing machine to obtain stress-displacement curves. The experimental results can be summarized;
1) After mortar was cracked, stress induced by pullout resistance of fibers was observed.
2) The displacement of PET-FRM at which stress took the post-cracking peak value (post-cracking strength) was considerably larger than that of SFRM.
3) The stress/force-displacement curves of SFRM/PET-FRM can be estimated by the results of a single steel/PET fiber pullout tests.
4) As far as SFRM is concerned, the number of fibers observed on the fractured surface is smaller than that on mechanically sectioned surface. In case of PET-FRM, no difference is found in the number of fibers between the fractured and the sectioned surface.
