<![CDATA[The research is do to analize the compressive strength and water absorption in the CLC lightweight brick made with a mix of fly ash and the ashes of andesit sawed stones and also to know if waste fly ash and the ashes of andesit sawed stones can be used as mixure of CLC lightweight bricks. The method used in this research that is by making light brick CLC with replacing sand material to the ashes of andesit sawed stones and fly ash substitution of 5%, 7%, 10%, 15%, 17% and 20% of the weight of the whole material. Lightweight brick that has been curing for 7, 14 and 28 days and then tested to obtain the compressive strength and water absorption from lightweight brick. Results of the research showed the largest compressive strength of CLC lightweight brick at the age of 7 days is 6 kg/cm2 on the rate of fly ash 20%. At the age of 14 days, the largest compressive strength value of CLC is 12 kg/cm2 on the rate of fly ash 20%, at the age of 28 days, the largest compressive strength value of CLC is 19.5 kg/cm2 on he rate of fly ash 20%. Water absorption of CLC lightweight brick on average at the age of 14 days is 18.54 gr/dm2/min, average water absorption of CLC lightweight brick at the age of 28 days is 12.44 gr/dm2/min, still enter into terms that reco mended with a maximum of 20 gr/dm2/min.]]>
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