Kusuma, Ilham Jaya2013-07-272013-07-272013-07-27rio andikahttp://repository.unri.ac.id:80/handle/123456789/4799This study aims to determine the optimum levels of fly ash to cement that can be used in normal quality concrete (f’c 10, f’c 17.5, f’c 25) and study the effect of fly ash on compressive strength test, absorption, porosity, and shrinkage of concrete. Percentage of fly ash used each with a variation of 0%, 10%, 20%, and 30% by weight of cement. The results showed that the use of fly ash on compressive strength testing of concrete quality on all three types of plans tend to decrease the compressive strength of concrete. Decrease in compressive strength increases with the addition of fly ash in the concrete mix. Based on test results obtained composition compressive strength concrete mix with the optimum use of fly ash is 30% on each of the quality of concrete plans. The use of fly ash in concrete mixtures tend to increase absorption, porosity, and shrinkage of concrete.otherconcretefly ashcompressive strengthabsorptionporosityshrinkage.student Paper Post Degree