The Effect of Hydrated Calcium Silicate Powder on the Three Main Indexes of Asphalt

The ball mill and the organic modifier were used to modify the powder of hydrated calcium silicate. Then the modified powders were characterization by oil absorption value, IR, SEM etc. Hydrated calcium silicate powders modified before and after were added to the asphalt and the three major indexes of asphalt were tested. The results show that the oil absorption activities of calcium silicate powder decrease obviously, the oil absorption value decreased 80%. IR spectra show that the hydrated calcium silicate powder adsorbed on the surface modifier, the modified powder morphology was changed. With the increase of powder content, the penetration increases, the ductility decreases. The softening point of asphalt mixed with unmodified powder increases with the increase of powder mixed with modified powder asphalt softening point of 4% to reach the maximum, and then began to decrease.