钢管内喷涂水泥砂浆新技术

Cement Mortar Spraying of Steel Pipe Inner Wall——a new protection technology

输水钢管尤其是大口径输水干管,内喷涂水泥砂浆是目前防腐效果最佳的先进技术。水泥砂浆主要由硅酸盐水泥、标准砂、洁净水、外加剂等组成。钢管内喷涂前需作适当的前处理,喷涂施工设备由喷涂机及配套设备所构成。喷涂时可视工艺要求使用或部分选用这些设备。经过28天多的养护,水泥砂浆涂层具有40MPa的强度,能耐受pH≮4的污水腐蚀,在自来水、江河水和碱性水溶液中有良好的抗腐蚀性能。水泥砂浆喷涂在我国有着良好的应用前景。

An up to date technology of cement mortar spraying of steel pipe inner wall for corrosion protection of water transport system is introduced in this paper. The cement mortar is composed of silicate cement, sand and additives. The test results showed that the strength of cement mortar coating could reach up to 40 MPa. and the anti-corrosion performance in wasted water (pH≥4) was also favourable.