THE UTILIZATION of IRON FITTING DUMB as A FILLER of FIBER CONCRETE PERFORMANCE
One of the way to increase the concrete products which have international standard and high performance are the development of fiber concrete technology. It can be developed by using the materials that are not used in the environment or a distructed dumb, it is called an iron fitting dumb. It is a remainder material from iron fitting shop process. This material is usually found in industrial area or machine-shop which some think it is useless in civil engineering. This research is showing the effect of increasing an iron fitting dumb from the compression strength, tension and bending moment. The variations in this experiment are the increasing of iron fitting dumb 0,5% ,1% and 1,5% of concrete volume. Water Cement Ratio (WCR) variation of 0.48, 0.56 and 0.60. The others are the distribution area to all of the concrete part and the length of fiber are showing the effect of each sample to the strength of fiber concrete compare to the normal concrete strength. The result of increasing 1,5% iron fitting dumb causes the increasing of tension strength 44,028 kg/cm2 , the increasing of slit tension strength 2,226 kg/cm2 , the increasing of bending moment14,81 kg/cm2 from normal concrete. 0,48 WCR produces tension strength, slit tension strength and bending moment more than 0,56 and 0,60 WCR. The increasing of iron fitting dumb with the distribution variation area and the spread concrete in the tension concrete area produce 3,705 kg/cm2 bending moment higher than the spread fiber in all of concrete area. The 4 cm fiber length produces the higher bending moment than the 2 cm fiber length. The difference is equally 5,185 kg/cm2 . The combination result of the examined acting varieties by continuation statistic test that is called BNJ test gives the result to get the maximum tension and split tensile. It is a concrete combination of increasing 1,5% fiber percentage, 0,48 WCR, full spreading area and the 4 cm fiber length. The maximum bending moment is the increasing of 0,5% fiber percentage, 0,48 WCR, full spreading area and the 4 cm fiber length.