親水性ポリウレタン樹脂を用いた有機系スラリーによる浸透固化処理砂の耐紫外線性評価および制御に関する実験的研究

抄録

Slurry scattering technique has been widely accepted to fix moving sand. By using organic slurry that has high water retention capacity, it seems that the vegetation on the desert may be realized. However, the organic material in the slurry, for example hydrophilic polyurethane, is easily decomposed by ultraviolet irradiation. In addition, the strength of ultraviolet ray is extremely strong on the desert. This paper is to examine the ultraviolet resistance of sand stabilized with organic slurry containing hydrophilic polyurethane in terms of its strength and decomposition rate. Ultraviolet resistance of the stabilized sand is improved by the addition of emulsified asphalt. Although all the asphalt emulsions used in the experiment have similar improving effects, the nonion emulsified asphalt is considered to be one of the best solution due to its neutrality. It is confirmed that the nonion emulsified asphalt is one of the best solution with neutrality. Moreover, the ultraviolet resistance of the stabilized sand can be controlled by changing the mixing ratio of emulsified asphalt. By mixing the emulsified asphalt in the slurry with the ratio of 5%, 6-8%, and 9%, the weight loss rate due to the ultrasonic irradiation was 1.5–1.8times, 2.1–5.4times, and 4.7–18.2times smaller respectively.