Pradita, SuryaKurniawandy AlexDjauhari Zulfikar2013-07-232013-07-232013-07-23rio andikahttp://repository.unri.ac.id:80/handle/123456789/4596This research determines the optimal composition of bottom ash waste replacement of sand that can be used in normal quality concrete (K-100, K-175 and K-250) and assess the influence of bottom ash waste to the compressive strength, absorption, porosity, and shrinkage of concrete. Percentage of waste bottom ash is used by 0%, 10%, 20%, and 30% of the weight of the sand.The results showed that the use of bottom ash to the compressive strength testing of concrete quality on all three types of plans tend to be lower when the compressive strength of concrete. Decline increases with the addition of bottom ash in concrete mixtures. However, the resulting compressive strength on all variations of the use of bottom ash still meet the standards of the planned concrete strength. Based on test results obtained composition compressive strength concrete mix with the optimum use of bottom ash is 30% on each of the quality of concrete plans. The use of bottom ash in concrete mixtures tend to increase the absorption and porosity of the concrete, but the concrete shrinkage decreases.otherconcretebottom ashcompressive strengthabsorptionporosityshrinkage.student Paper Post Degree