南水北调排水倒虹吸侵蚀成因分析及修复技术研究

发布时间：2018-02-27 13:33

本文关键词： 混凝土腐蚀作用破坏机理硫酸盐修复技术　出处：《郑州大学》2017年硕士论文　论文类型：学位论文

【摘要】：混凝土作为用途极为广泛的人工建筑材料,其耐久性问题获得了世界范围内众多研究者越来越多的关注。引起钢筋混凝土结构侵蚀破坏的原因主要包括Cl-、SO42-等离子侵蚀、碳化作用、酸性介质及水作用破坏。混凝土是多孔材料,长期暴露于自然环境中,再加上以水为载体,腐蚀性物质会更加容易进入混凝土内部,混凝土保护层受到侵蚀作用,钢筋表面钝化膜破坏后,钢筋也会开始被腐蚀,结构承载力会下降,发生开裂,以及外观损伤。本文针对南水北调中段某倒虹吸工程中钢筋混凝土侵蚀破坏情况,对其进行了现场检测与分析,结果表明:环境水对混凝土侵蚀的影响主要存在于混凝土表面,硫酸盐侵入对混凝土的影响度有限,倒虹吸混凝土的侵蚀属于溶解性侵蚀,来自化工厂工业废水造成了环境水的强酸侵蚀的环境。造成该工程钢筋混凝土侵蚀的原因包括碳化、水、酸性侵蚀、硫酸盐等介质的侵蚀作用,其中酸性环境下氢离子的侵蚀作用起主导地位。在已发生侵蚀的混凝土构件上,可以采取适当措施补救侵蚀作用造成的损伤,并预防侵蚀的进一步发展。针对倒虹吸混凝土表面侵蚀的处理,本文对环氧沥青防腐涂层、聚氯乙烯油膏涂层、喷涂聚脲、高渗透改性环氧防腐涂料四个方案进行了比选,综合考虑功能、造价和适用性,推荐采用高渗透改性环氧防腐涂料作为侵蚀修复的材料,并在实际工程中进行了应用。
[Abstract]:As a widely used artificial building material, the durability of concrete has been paid more and more attention by many researchers all over the world. Carbonation, acid medium and water damage. Concrete is porous material, exposed to the natural environment for a long time, and with water as the carrier, corrosive substances will more easily enter the concrete interior, and the concrete protective layer will be eroded. After the passivation film on the surface of the steel bar is destroyed, the steel bar will also be corroded, the bearing capacity of the structure will decrease, the crack will occur and the appearance will be damaged. This paper aims at the corrosion and damage of reinforced concrete in a inverted siphon project in the middle section of the South-to-North Water transfer Project. The results show that the influence of environmental water on concrete erosion is mainly on the surface of concrete, the influence of sulfate invasion on concrete is limited, and the erosion of inverted siphon concrete belongs to dissolved erosion. Industrial waste water from chemical plants creates an environment of strong acid erosion of environmental water. The causes of the reinforced concrete erosion of the project include the erosion of carbonation, water, acid erosion, sulfate and other mediums. In acid environment, hydrogen ion erosion plays a dominant role. In concrete members that have already been eroded, appropriate measures can be taken to remedy the damage caused by erosion. Aiming at the treatment of surface erosion of inverted siphon concrete, this paper compares four schemes of epoxy asphalt anticorrosive coating, polyvinyl chloride ointment coating, sprayed polyurea and high permeability modified epoxy anticorrosive coating. Considering the function, cost and applicability, it is recommended that high permeability modified epoxy anticorrosive coating be used as the material for corrosion repair, and it is applied in practical engineering.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV672.5;TV698.2

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