THE USE OF SAWDUST WASTE ASH AS CEMENT SUBSTITUTE MATERIAL IN CONTRAST TO THE COMPRESSIVE STRENGTH OF THE K-175 QUALITY CONCRETE

Abstract

Sawdusts as the waste from home furniture industry are frequently deemed as of low economic value. In attempt to create a healthier and waste-free environment and make use of the waste, many inovations have been being conducted. One is an attempt to create concrete technology that can make use of sawdusts ash into the concrete mix. The main aim of this study is to acknowledge how the effect of the additional sawdusts to concrete mix affect its compressive strength.. Sawdusts used in this study obtained from various kind of woods. Concrete with the additional mix used in different proportions. In this case, the ash used to substitute parts of the cement. Variations used in this study is 0%, 5%, 7%, and 10%. Testing object takes form in cylindre Ø 15 cm x 30 cm and compressive strength plan in fc f'c ± = 14,5 Mpa (K-175). After 7 days of incubation, the testing result obtained in form of 7 days compressive strength which will then correlated into 28 days. The value of compressive strength in additional variation is 0%, 5%, 7%, 10%, respectively on 19,85 Mpa, 16,54 Mpa, 15,36 Mpa, 13,23 Mpa.. From the study, it is concluded that sawdusts ash cannot be used in concrete, due to its decreasing nature in compressive strength.