Effects of Concrete Compressive Strength of Steel and Polyester Fiber Admixtures and Vacuumed Dewatering Application

Vacuum dewatering method is the process of removing some of mixing water from fresh concrete. Therefore, excess mix water damages are prevented and mechanical strengths increase after concrete takes the shape of the mold. Fiber admixtures are mostly used for increasing the flexural strength of concrete. However, there are also effects on the compressive strength. In this study, the effects of application of the vacuum dewatering on the compressive strength of concrete are examined with addition of steel and polyester fibers. The parameters of the study are fiber types (steel, polyester), fiber ratios (3 different ratios), fiber lengths (long, short) for concrete class (C16/20‐C25/30‐C35/45 according to EN) and two different application methods (normal, vacuum). The compressive strengths of the concrete prepared in accordance with these parameters are determined after 1, 3, 7 and 28 days. Thus, it is investigated that each of the parameters is affected concrete compressive strength.