Pengaruh Penggunaan Fly Ash Pada Beton Mutu Moderat (K-300)

Abstrak

Various research and experiments in the field of concrete are carried out as an effort to improve the quality of concrete, material technology and implementation techniques obtained from the results of research and experiments intended to answer the increasingly high demands on the use of concrete and overcome the obstacles that often occur in the implementation of work in the field.The purpose of this study was to obtain a compressive strength of moderate quality concrete and to determine the extent of the effect of cement replacement with Fly Ash on the compressive strength of concrete quality. The composition of cement replacement with fly ash is 0%, 10%, 20%, 30%, 40%, 50% of the weight of cement and the cement water factor is determined the same in all variations of the mixture. The sample used was cylindrical (15 cm x 30 cm), the planned concrete quality was 25 MPa at 28 days. Samples were tested at ages 7, 14, and 28 days, with care being taken before testing. The number of samples was 54 samples, consisting of 6 variations and 9 variations each. From the research it was found that the highest concrete compressive strength was found in the mixture of concrete with cement replacement with Fly Ash 10%, which was 27.34 MPa and the lowest concrete compressive strength was found in concrete mixture with Fly Ash 50%, which was 23.18 MPa. The effect of Fly Ash in low quality concrete is that the smooth Fly Ash granules make the concrete more dense because the cavities between the aggregate grains are filled by Fly Ash, so as to minimize the existing pores and utilize the pozzolanic properties of Fly Ash. Besides the use of Fly Ash with certain doses proven to increase the strength of concrete.Keywords: Concrete; Compressive Strength; and Fly Ash.