<![CDATA[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.]]>
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