Kouta MAKINO
Study on Basic Characteristics and Blending Percentage of Molten Slag Sand for Wearing Course Asphalt Mixtures
Osamu Takahashi
A molten slag is produced by fusing incinerated ashes of non-industrial waste with higher than 1200 ¡î, and solidifying it with rapidly cooling down. Adjustment of the particle gradation is conducted to use as fine aggregate for construction materials. Since physical characteristics of molten slag sand depend on the production facility, the characteristics shall be assessed as a construction material. Shinden Cleaning Center of Niigata City produces molten slag sand, but more than 2000 tons of that are disposed every year.
Basic physical and chemical characteristics of the molten slag sand were evaluated as fine aggregate for wearing course asphalt mixtures. Plastic flow resistance and cracking resistance of mixtures blended with the molten slag sand were also investigated. The results were compared with those of natural sand in order to discuss a proper blending percentage.
The molten slag sand has higher density and lower water absorption coefficient than the natural sand, but angular degree of the particle shape is almost same. Effusion amounts and contents of the toxic substances in the slag sand were also checked whether the values comply the environmental requirements or not. It was confirmed that the molten slag sand was completely satisfied with the standard of "JIS A 5032" as fine aggregate for asphalt mixture.
When the molten slag sand was blended with more than 15 % of the total volume, not only plastic flow resistance but also cracking resistance of the mixtures were declined. The tests results showed that within 10 % of blending percentage was valid for a wearing course asphalt mixture in snowy cold regions.
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