Experimental Study on the Evaluation and Control of the Ultraviolet Resistance of Sand Stabilized with an Organic Slurry Containing Hydrophilic Polyurethane
English version of the paper published in gJournal of the Society of Materials Science, Japan,57(11):1167-1172(2008)
Zhiren WU, Kentaro IWASHITA, Zhishen WU and Hirondo INAGAKI
Abstract:The slurry scattering technique has been widely accepted as a method for fixing moving sand. Using an organic slurry that has high water retention capacity may allow for the growth of vegetation in the desert. However, organic material in the slurry, such as hydrophilic polyurethane, is easily decomposed by ultraviolet irradiation, and ultraviolet rays are extremely strong in the desert. The goal of this paper is to examine, in terms of strength and decomposition rate, the ultraviolet resistance of sand stabilized with an organic slurry containing hydrophilic polyurethane. Adding emulsified asphalt improved the ultraviolet resistance of the stabilized sand. Although all of the asphalt emulsions used in the experiment have similar beneficial effects, the nonionic emulsified asphalt is considered to be one of the best solutions due to its neutrality. Moreover, the ultraviolet resistance of the stabilized sand can be controlled by changing the mixing ratio of the emulsified asphalt. By mixing the emulsified asphalt in the slurry at ratios of 5%, 6`8%, and 9%, the weight loss rate due to ultraviolet irradiation was 1.5`1.8 times, 2.1`5.4 times, and 4.7`18.2 times smaller respectively. Key Words:Desert landscape, Organic slurry, Hydrophilic polyurethane, Ultraviolet resistance, Emulsified asphalt