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| Experimental study on composite insulating plastic board of preventing channel seepage and frost heave |
| HE Wu-Quan, ZHENG Shui-Rong, SHEN Chang-Yue |
(1.College of Water Resources and Architectural Engineering, Northwest A ＆ F University, Yangling, Shannxi 712100, China; 2.Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Yangling, Shannxi 712100, China; 3.Faculty of Science, Northwestern Polytechnical University, Xi′an, Shannxi 710072, China) |
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Abstract A composite insulating plastic board of polyurethane foam, in which the powders of broken corn stalks have been stuffed, was invented; its formula and preparation technology were primarily decided as well. Effects of the size and content of broken corn stalks power (0＜D≤0.45 mm,0.45＜D≤1.50 mm，1.50 mm＜D≤4.00 mm), on the density, compression strength and thermal conductivity of the polyurethane foam plastic were experimented. Meanwhile, their influences on the foaming time, foam molding of the plastic were observed too. The results showed that when the corn stalk broken powder size is fixed, the density of the foam plastic increase, its compression strength drops off with increasing content of the powders stuffed. When the broken corn stalks powder size and filled content are 0.45 mm＜D≤1.50 mm and 30%, the compression strength (compressed by 10%), heat conductivity (－40-＋70 ℃) and dimension change of the composite polyurethane foam plastic board are 85 kPa, 0.038 W/(m·K) and ±1%, respectively, suggesting the board can satisfy the requirements on the performance preventing seepage in channel lining applications and damage on channels caused from frost heave. According to estimates, using this composite insulating foam board in projects can reduce their cost by about 25%. Moreover, waste products of agriculture can be made full use, reducing pollution on the environment caused from disposal or incineration of those wastes.
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Received: 16 March 2012
Published: 30 September 2012
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