Abstract
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.
Highlights
To improve the asphalt performance and meet the requirements of high grade highway, in the asphalt adding modified material and preparation of modified asphalt is a commonly used method, which polymer, mineral fillers and additives is commonly modified material[1,2,3]
Hydrated calcium silicate powder (CSH) is the extraction of a new type of powder material, the industrialization process of aluminums prepared in high alumina fly ash non-toxic tasteless, white color, fine particles, porous
The polarity of hydrated calcium silicate inorganic powder is very large, directly applied to the asphalt matrix will appear uneven dispersion, so this paper studied the unmodified and modified powder effect on asphalt performance
Summary
To improve the asphalt performance and meet the requirements of high grade highway, in the asphalt adding modified material and preparation of modified asphalt is a commonly used method, which polymer, mineral fillers and additives is commonly modified material[1,2,3]. Polymer, such as SBS and SBR, significantly improve the performance of asphalt, but the cost is high [4, 5]. Powder milling is an important technology of preparation, surface treatment and organic modification It is a simple method, good modification effect and high efficiency. The CSH as the object of study by planetary ball mill and silicon coupling agent modified of hydration calcium silicate powder, and the modified powder is added into the asphalt, the performance changes before and after the modification of powder and change before and after the powder to asphalt penetration, extended the influence of degree and softening point
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