输水工程钢顶管内防腐材料性能试验研究

Experimental Study on Properties of Inner Anti-corrosion Material for Steel Pipe Jacking of Water Conveying Engineering

针对弱碱性原水输水工程的钢顶管内防腐,取样分别涂覆水泥砂浆衬里和液体环氧涂层,进行浸泡失重和性能检测,并开展水泥砂浆裂缝浸泡试验。结果表明：浸泡后,水泥砂浆吸附水中颗粒后一直处于增重状态,环氧液体的重量基本保持恒定。水泥砂浆耐碱腐蚀性较好,化学性能比较稳定。液体环氧涂层耐碱性一般,可能会少许脱落和表层变化,化学稳定性一般。水泥砂浆裂缝经浸泡,不消失,尺寸也不减小。对于6~8 mm裂缝,水可渗透到管道外部,需进行灌浆修补。2~3 mm裂缝基本无水渗漏,无需修补。

Aiming at the inner corrosion resistance of steel pipe jacking in the alkalescent raw water conveyance project, the cement mortar coating and liquid epoxy coating are sampled to carry out the soaking weight loss and performance test, and to conduct the cement mortar crack soaking experiment. The result shows that the cement mortar is always at the weight gain state after soaked to adsorb grain in water while the weight of epoxy liquid basically remains constant. The alkali resistance of cement mortar is better and its chemical performance is more stable. However the alkali resistance of liquid epoxy coating is commonly and may be a little off and surface changes, and the chemical stability is commonly. The crack of cement mortar is not clear away and its dimension is also not decreased after soaked. For 6~8 mm cracks, the water can permeate to the outer of pipe, and it is required to carry out the grouting repair. For 2~3mm cracks, it is not necessary to repair because of no water leakage basically.