Karakteristik Struktur Mikro, Struktur Fasa dan Sifat Fisis Komposit Silika Sekam Padi dengan Aspal

Synthesis and characterization silica of rice husks and asphalt composites have been carried out with a ratio of 65%: 35%; 70%: 30% and 75%: 25%. Silica synthesis from rice husk was carried out using the sol-gel method. The materials used in this research are rice husks, asphalt, aquades, gasoline, NaOH and HNO3. The purpose of this study was to determine the effect of silica and asphalt mass variations on the characteristics of microstructure, phase structure and physical properties namely density and porosity. Based on the research that has been done, it can be concluded that the results of SEM analysis show the formation of wad and cracks on the surface of the sample with an average grain size of 3,236 µm, 3,728 µm and 2,924 µm. In the EDS analysis results it can be seen that the elemental content contained in the samples is silica, oxygen, carbon, sulfur, sodium and aluminum. Where are the elements that dominate are the elements of silica, oxygen and carbon. Then based on XRD characterization results it is known that the sample has structure amorphous silica and amorphous carbon . The amorphous silica structure experiencing a shift 2θ with the highest peak intensity, from 2θ = 21˚ to 2θ = 22˚. Furthermore, the physical properties test of density 2.402 g / cm3, 2.692 g / cm3 and 2.852 g / cm3. In the physical properties test the porosity obtained was 9,825%, 8,028% and 6,835%.