| Summary: | 碩士 === 國立嘉義大學 === 土木與水資源工程學系研究所 === 106 === In this study, a tubular sand-containing water flow abrasion tester developed by Professor Liu Yu Wen's research team was used to investigate the impact abrasion resistance of polyurea materials under different flow conditions. The test parameters are different flow impact velocity (12m/s, 16m/s, 20m/s), sand content (0kg/m3, 200 kg/m3, 230 kg/m3) and sand particle size (0.15mm, 2.5mm, 5mm).
The results of the test of the tubular sand-containing water flow show that when the flow rate of the test conditions is increased from 12 m/s to 16 and 20 m/s, Cumulative tube flow wear increases by 21% and 200%, respectively, while tube flow abrasion increases by 2.6% and 56%, respectively. When the sand content of the test conditions increased from 50 kg/cm3 to 200 and 230 kg/cm3, the cumulative pipe wear thickness increased by 150% and 281%, respectively, and the tube flow abrasions increased by 6.5% and 62.6%, respectively. When the sand size of the test conditions was increased from 0.15 mm to 2.5 and 5 mm, the cumulative pipe flow wear thickness increased by 2.5 and 8.9 times, respectively, and the pipe flow abrasion amount increased by 10.8 and 17.6 times, respectively. Comparing the 6-hour cumulative tube flow abrasion of polyurea, epoxy resin mortar and high-strength concrete (fc'=700 kgf/m2), the cumulative grinding amount of epoxy resin mortar and high-strength concrete is higher than that of polyurea. Increased 1 and 3 times.
On the other hand, the drying strength of the dried concrete and polyurea drying curing was measured to be a maximum of 3.1 MPa; followed by dry concrete and polyurea high humidity curing, wet concrete and polyurea drying curing, dry concrete and polyurea acid curing , Wet concrete and polyurea high humidity curing, minimum dry concrete and polyurea water curing.
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