KUAT TEKAN BETON DENGAN BOTTOM ASH SEBAGAI SUBTITUSI PENGGANTI AGREGAT HALUS

Bottom ash is B3 waste obtained from coal burning at Steam Fired power plant (PLTU). The use of base ash in concrete is expected to be capable of B3 waste which can pollute the environment, the use of bottom ash is also expected to be able to create high quality concrete that can be used as sand material. The variation in the use of bottom ash in this study is 30%, 40% and 50% of heavy sand, the use of the curring method carried out in this study is the water curring method and sealed curring, these variations are expected to increase the compressive strength of concrete with substitution of bottom ash as very fine. The bottom ash used in this research comes from the PLTU which is located in Jepara and has been processed in such a way that it is ready to be used as a sand stream. The bottom ash material is supplied by PT. Varia Usaha Beton. The method of mixing materials or the mix design used in this study is the reference to the ACI (American Concrete Institute) Committee 211,2008. Concrete with bottom ash substitution uses two curring methods, namely water curring and sealed curring. The use of this method aims to determine the optimal compressive strength of two different types of curring methods. Concrete with 30% bottom ash composition at 3 days of age with different methods obtained the highest strength results, namely 14.47 MPa and 7 days of concrete, which is 21.27 MPa, and at the composition of bottom ash 40%, the age of 3 days of concrete obtained compressive strength. the highest was 13.48 MPa, while at the age of 7 days it was 19.93 MPa. Bottom ash with a sand point of 50% produces the highest compressive strength at the age of 3-day concrete, namely 16.13 MPa, at 7 days of concrete the highest compressive strength is 22.77 MPa. Concrete with bottom ash substitution has a higher compressive strength compared to normal concrete, at different curring methods, the results show that the sealed curring method is a curring method that has the highest average compressive strength compared to the water curring method.