Abstract
This research was carried out to investigate the effect of asphalt addition to thermal characteristics, functional groups, physical properties (water absorption, water content, and swelling thickness) of rice husk silica. The mass ratio of silica and asphalt alloys were 1:0; 1:0,4; 1:0,5; and 1:0,6. Silica and asphalt were mixed at 160˚C followed by calcination at 150˚C for 3 hours. Thermal characteristics and phase structures were analyzed using Differential Thermal Analysis/Thermo Gravimetrical Analysis (DTA/TGA), X-ray Diffraction (XRD), and Fourier Transform Infrared (FTIR). DTA/TGA analysis results show that the addition of asphalt causes a decreasing in mass, on set temperature, maximum temperature, endothermic temperature And an increase in exothermic peak temperature. The results of XRD analysis showed that the addition of asphalt resulted in the appearance of amorphous carbon, shifting the range and the highest intensity of 2θ amorphous silica. The results of FTIR analysis showed that the addition of asphalt resulted in appearance the functional grups of C-H. The addition of asphalt causes a decrease in the value of water absorption, water content, and swelling thickness.
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