COMPRESSIVE STRENGTH OF RICE HUSK ASH AND PAPER WASTE AS A SUBSTITUTE FOR CEMENT

The Use of rice husk in concrete loading has been widely carried out, the function of rice husk ash varies, there is a concrete mixture added, and there is also a partial replacement of SCM (Supplementary Cementitious Material). Rice husk has a very dominant chemical content of SiO2, as we know in the chemical content of cement SiO2 and CaO are very important. In this study combining rice husk ash and paper waste ash, paper waste ash has a dominant chemical content, namely CaO. This study wanted to conduct an experiment on the Use of rice husk ash and paper waste ash as a substitute for the designation of SCM cement. This study combines rice husk ash and paper waste ash, with various types of compositions of 2.5%, 5%, and 7.5% of two materials made of cylindrical concrete specimens of 150 mm. 300 mm size with a compressive strength plan at the age of 28 days to 25 MPa, and made from 0% specimens (without ash) from the compressive strength test results obtained compressive strength results of a mixture of rice husk ash and paper ash at a composition of 7.5% obtained compressive strength results in 27.8 MPa, and 27.2 MPa, while the comparative test object 0% obtained 25.1 MPa, rice husk ash, and paper ash can be used as an alternative substitute for part of SCM cement.