| 摘要 |
PURPOSE: A concrete tube is provided to extend the life of a concrete tube by increasing acid resistance, alkali resistance, corrosion resistance, etc. and to heighten economical efficiency by reducing manufacturing expenses. CONSTITUTION: The concrete tube(1) contains a coating layer(2) formed by applying resin mortar, wherein the concrete tube(1) is a cement reinforced concrete tube and the resin mortar is composed of 40-50 percent unsaturated polyester, 5-15 percent fine ash, 10-15 percent calcium carbonate and 10-20 percent quartz sand, etc.
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