KARAKTERISASI ABU LAYANG INDUSTRI BAN DAN PEMANFAATANNYA UNTUK PEMBUATAN BATAKO

characterization of fly ash from tire industry and its use forconcrete brick production

Abstract

The use of coal asenergy sources at boiller engine of tire industry  can causes fly accumulation.  The objective of the research is to study feasibility of fly ash waste from tire industry for concrete brick  production,   by involve  the fly  ash/cement,  water/(fly ash + cement+  sand) ratio and lime addition.  The fly ash characterization   carried out by gravimetri methode analysis.  The test materials of brick were made by mixed  fly ash, cement,  sand,  lime and water in given weight ratio. The mixture was stirred untuil was found the workable paste. The casting of test material  carried out the cubic 7 x 7 x 7 cm in size. The compressive  strength was test carried out after 28 days curing.  The result show that the major enstituent of fly ash is fol• lowed :  Si02  63,01   %, Al203  9,27 %,  Fe203 6,31   %,  CaO 5, 19  % and Mg 0,05  %. The com• pressive strength of brick  to decrease by increasement  of the used fly ash.  At the ratio  of fly ash/cement 20 : 80  and 30 : 70, 600 g sand,  the compressive  strength of brick is 118,  l 5 and 108,08 kg/cm2   respectively.  The ratio  ofwater/(fly  ash+  cement+  sand) influence the compressive strength on concrete brick. The compressive  strength reach the maximum value  at given point  and than to gradually decrease.  At the composition  of fly/cement= 30: 70 and 20:  80 the compressive strength is maximum at the ratio of water/(fly ash+ cement+ sand) 0, 10 and between  0, 10  - 0, 15 are respestively.  The addition of lime  at mixture of fly ash, cement and sand is  trend to decrease the compressive strength. Addition,  in concrete brick production,  the addition  of fly ash it is preferable  if not more than 25 - 30 % of the used  cement and mechanically  compression.