给水管道水泥砂浆内衬腐蚀影响因素及其对水质的影响

发布时间：2018-05-01 10:34

本文选题：水泥砂浆内衬 + 腐蚀　；参考：《天津大学》2014年硕士论文

【摘要】：本文从给水水质安全的角度出发,研究影响水泥砂浆内衬腐蚀的五个水质因素,它们分别是:硫酸根离子、氯离子、镁离子、钙离子和pH。通过建立单因素和多因素实验,采用静态管段浸泡的方式,研究水泥砂浆内衬在不同水质作用下硅酸盐溶出情况。同时定期检测常规水质指标,观察水泥砂浆内衬腐蚀对水质的影响。除此之外,为了更加直观的研究水泥砂浆内衬在这五种水质因素作用下的腐蚀变化情况,采用制备水泥砂浆试片的方式模拟真实管段的水泥沙内衬,利用表征的手段直观分析水泥砂浆内衬表面的微观形貌改变。最后,在实验数据的基础上,运用统计学方法,建立硅酸盐溶出模型,探讨这五种水质因素对水泥砂浆内衬腐蚀的影响。综合以上试验研究,得到以下成果:(1)从给水水质的角度出发,通过实验和模型得出这五种水质因素:硫酸根离子、氯离子、镁离子、钙离子和pH,都会影响水泥砂浆内衬的腐蚀。(2)通过单因素实验和观察水泥砂浆试片微观形貌变化得出,高浓度的硫酸根离子和氯离子,对水泥砂浆内衬腐蚀影响较为严重。通过相关性分析进一步证实了实验结论,得出二者与硅酸盐溶出呈现出正相关性。(3)通过单因素实验和观察水泥砂浆试片微观形貌变化得出,低浓度的钙离子和镁离子,对水泥砂浆内衬腐蚀的影响较为严重,通过相关性分析得到的结论与实验相符,二者与硅酸盐溶出呈现出较强的负相关性。另外,经过试验和模型证实,偏酸性的水质,也有利于水泥砂浆内衬的腐蚀。(4)为了更加贴近真实水质情况,采用多因素实验,研究五种水质因素共同作用下,对水泥砂浆内衬腐蚀的影响。得出当水质呈现偏酸性、低硬度、氯离子和硫酸根离子浓度也较低的情况时,对水泥砂浆内衬腐蚀影响最为严重。(5)利用全回归、逐步回归和因子分析的手段,进一步验证了这五种水质因素对水泥砂浆内衬腐蚀的影响,并得出除这五种水质因素影响外,碱度对水泥砂浆内衬腐蚀的影响也较为显著。
[Abstract]:From the point of view of the safety of feed water quality, five factors affecting the corrosion of cement mortar lining are studied in this paper. They are sulfate ion, chloride ion, magnesium ion, calcium ion and pH. By establishing single-factor and multi-factor experiments, the dissolution of silicate from cement mortar lining under different water quality was studied by means of static soaking in pipe section. At the same time, the influence of cement mortar lining corrosion on water quality was observed. In addition, in order to study the corrosion change of cement mortar lining under the action of these five kinds of water quality factors more intuitively, the cement sand lining of real pipe segment was simulated by preparing cement mortar test piece. The microstructure change of cement mortar lining surface was analyzed directly by means of characterization. Finally, on the basis of the experimental data, the silicate dissolution model was established by using statistical method, and the influence of these five water quality factors on the lining corrosion of cement mortar was discussed. From the point of view of water quality of feed water, through experiments and models, five water quality factors are obtained: sulfate ion, chloride ion, magnesium ion, Both Ca ~ (2 +) and pH will affect the corrosion of cement mortar lining. (2) through single factor experiment and observation of the microstructure of cement mortar, it is concluded that the high concentration of sulfate ion and chloride ion have more serious influence on the corrosion of cement mortar lining. The experimental results were confirmed by correlation analysis, and it was concluded that there was a positive correlation between them and silicate dissolution. (3) through single factor experiment and observation of microcosmic morphology of cement mortar, it was concluded that the low concentration of calcium ion and magnesium ion, The effect on the corrosion of cement mortar lining is more serious. The conclusion obtained by correlation analysis is consistent with the experiment, and there is a strong negative correlation between them and the dissolution of silicate. In addition, it is proved by experiments and models that the slightly acidic water quality is also beneficial to the corrosion of cement mortar lining. In order to be closer to the real water quality, the multi-factor experiment is used to study the combined action of five water quality factors. The influence on the corrosion of cement mortar lining. It is concluded that when the water quality is slightly acidic, low hardness, chloride ion and sulfate ion concentration is also lower, the corrosion of cement mortar lining is the most serious. 5) by means of full regression, stepwise regression and factor analysis, The influence of these five water quality factors on the corrosion of cement mortar lining is further verified. Besides these five water quality factors, the effect of alkalinity on the lining corrosion of cement mortar is also obvious.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU991.2

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