This research is oriented towards concrete reinforced with combinations of macro and micro polypropylene fibers with total volume fractions of about 1.0 percent, so it is most important to understand how the combinations of macro and micro polypropylene fibers behave in the cement composite matrix. Two groups of composite concrete were constructed using combinations of macro and micro polypropylene fibers. The experimental test results show a new interesting parameter to consider - the activated fiber surface area, which appears to be a good indicator of fiber performance. The combinations of macro and micro polypropylene fibers allowed a higher activated surface area of fibers that improve the composite concrete properties which are advantageous in achieving a high ultimate composite strength when compared to its individual fiber.