<![CDATA[The incineration from the coal industry produces waste such as bottom ash and fly ash that can pollute the environment. The use of waste in particular produced by PLTU Kertasari district of West Sumbawa is still not optimal so there needs to be an alternative to address the problem. The study used experimental methods to obtain the composition of a mixture of additive fly ash as cement additive and bottom ash as a substitute for sand on concrete. The objective of the study was to find out the slump values, the Compressive Strength of concrete pressure at age 7 and 28 days on the variations of fly ash 0%, 20%, 40%. and 60% as well as to find the strength comparisons of the pressure concrete life 7 and 28. The study used a cylinder-shaped test object of 15 test objects where for each variation there were 3 testing objects. As for the result obtained is a slump value with additive fly ash producing the largest mixture at 0% variation that is of 11.5 cm. The Compressive Strength value of concrete produced at the age of 7 days is at a variation of 60% which is of 6,09 MPa. Whereas at the age of 28 days the highets compressive strength valeu of concrete was produced at the age of 28 days with a variation of 60% namely 13,02 MPa.]]>
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