污水浸泡环境下混凝土的微生物腐蚀影响研究
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摘要
通过对混凝土试件外观形貌、质量、强度和矿物成分的演变规律分析,研究了污水浸泡环境下微生物对混凝土性能的影响。研究结果表明:当180 d时,对照组外观形貌破坏较试验组更加严重,质量损失率对照组大于试验组,但抗压强度两组相近;造成对照组腐蚀的原因是酸与硫酸钠晶体膨胀的共同作用,而导致试验组腐蚀破坏的原因是钙矾石和石膏的双重膨胀破坏。
The effects of microorganisms on the performance of concrete immersed in sewage is studied by the evolution of appearance, quality, strength and mineral composition of concrete specimen. The results show that the appearance damage of the control group is more serious than the experimental group at 180 d, the quality loss rate of the control group is larger than the test group, but the compressive strength of the two groups is similar. The cause of the corrosion of the control group is the joint effect of acid and sodium sulfate crystal expansion, and the cause of the corrosion failure of the test group is double expansion of alum and gypsum.
The effects of microorganisms on the performance of concrete immersed in sewage is studied by the evolution of appearance, quality, strength and mineral composition of concrete specimen. The results show that the appearance damage of the control group is more serious than the experimental group at 180 d, the quality loss rate of the control group is larger than the test group, but the compressive strength of the two groups is similar. The cause of the corrosion of the control group is the joint effect of acid and sodium sulfate crystal expansion, and the cause of the corrosion failure of the test group is double expansion of alum and gypsum.
引文
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[2]Belie N D,Monteny J,Beeldens A,et al.Experimental research and prediction of the effect of chemical and biogenic sulfuric acid on different types of commercially produced concrete sewer pipes[J].Cement&Concrete Research,2004,34(12):2223-2236.
[3]王萌.城市生活污水对混凝土的腐蚀及防治研究[D].石家庄:石家庄铁道大学,2015.
[4]唐咸燕,肖佳,陈烽,等.混凝土的细菌腐蚀[J].中国腐蚀与防护学报,2007,27(6):373-378.
[5]陈六平.材料的微生物腐蚀破坏机制研究进展[J].江西科学,1996,14(1):59-66.
[6]闻宝联.城市污水环境下混凝土腐蚀及耐久性研究[D].天津:天津大学,2005.
[7]包昕.污水环境下混凝土的劣化行为及预测研究[D].石家庄:石家庄铁道大学,2016.
[8]袁腾,周闯,周建,等.混凝土防护用渗透型有机硅膏体的制备与性能[J].建筑材料学报,2016,19(3):496-502.
[9]高润东.硫酸钠晶体侵蚀混凝土时的演变特征[J].Scientific Journal of Materials Science,2012,2(1):7-11.