本文選題：污水 + 混凝土　； 參考：《石家莊鐵道大學(xué)》2015年碩士論文

【摘要】：城市污水環(huán)境下,大量的處理或輸送污水的混凝土構(gòu)筑物受到了嚴(yán)重的腐蝕,使混凝土的壽命達(dá)不到預(yù)期的使用年限而發(fā)生破壞,其中微生物對混凝土的腐蝕最為嚴(yán)重。在研究混凝土的防腐蝕措施中,混凝土的改性和使用表面涂層都是較為被動的措施,不能從根本上抑制微生物的生成,所以本文中在混凝土中摻加殺菌劑這種較為主動的措施應(yīng)用在在混凝土的防腐措施中。試驗用二沉池的厭氧污泥配制了人工強化污水,模擬微生物對混凝土的加速腐蝕;設(shè)計并加工了污水腐蝕混凝土的試驗裝置;對比著做了污水和清水不同浸泡環(huán)境下,摻加不同種類的殺菌劑,分別浸泡在污水中不同的位置,以及不同種類的試件的腐蝕性能和腐蝕機制的研究。與清水浸泡中混凝土試件強度增長的規(guī)律不同,污水浸泡環(huán)境下,混凝土的抗折強度前28 d是增長的,增長速率達(dá)到7.1%,超過28 d后,隨著齡期增長,混凝土的強度開始持續(xù)下降,到150 d時下降速率達(dá)到12.4%。且污水環(huán)境下,混凝土試件的抗折強度比抗壓強度劣化更明顯,抗折強度更能表征試件劣化性能的規(guī)律。與強度規(guī)律類似,污水浸泡下的混凝土試件質(zhì)量是持續(xù)下降的,到28 d和150 d時,質(zhì)量損失率分別達(dá)到2.24‰和6.73‰;清水浸泡中的試件質(zhì)量呈現(xiàn)不斷上升的趨勢,特別是前8周上升趨勢比較明顯,而后到150 d時上升則逐漸趨于平緩。由此說明浸泡在污水中的試件受到了污水的腐蝕作用。并且對于污水浸泡環(huán)境下的全部浸泡、部分浸泡和凈漿、砂漿、混凝土試件的對比研究發(fā)現(xiàn):部分浸泡在污水中的混凝土要比全部浸泡在污水中的混凝土性能要好;不同骨料的試件的抗腐蝕性能順序依次為:凈漿砂漿混凝土。一方面是由于厭氧環(huán)境下部分浸泡在污水中的試件要比全部浸泡在污水中接觸面積小,另一方面是由于骨料引入界面,使材料的耐腐蝕性能變差。污水中浸泡的摻了十二烷基二甲基芐基氯化銨的混凝土試件從初始到整個腐蝕過程中,效果都不太理想,它的抗腐蝕效果甚至不如污水中不摻殺菌劑的試件,因此不適合用作殺菌劑摻在混凝土中。而對于另外兩種,摻殺菌劑試件的強度衰減系數(shù)和質(zhì)量損失率均是減小的,摻殺菌劑能減輕污水的腐蝕作用,污水中摻殺菌劑比不摻殺菌劑試件強度能提高17.2%,摻溴化鈉的混凝土試件對污水的腐蝕作用有明顯的改善,且防腐蝕性能最好;摻鎢酸鈉的混凝土試件對污水的腐蝕也有防治作用,但是效果不如溴化鈉明顯,質(zhì)量能達(dá)到摻溴化鈉試件的80%左右;摻溴化鈉試件越是摻鎢酸鈉試件體積膨脹率的84.6%。在微觀試驗中,通過對比清水和污水中浸泡在不同位置的摻殺菌劑和不摻殺菌劑試件的孔結(jié)構(gòu)、XRD和掃描電鏡圖片發(fā)現(xiàn):污水中、不摻殺菌劑和全部浸泡在污水的環(huán)境下CH含量均有所降低;孔隙率和大孔結(jié)構(gòu)數(shù)量上增多,污水中水泥石的孔隙率約是清水中孔隙率的1.5倍;污水中不摻殺菌劑水泥石的結(jié)構(gòu)變得疏松,有鈣礬石生成,說明摻了殺菌劑可以起到明顯的抑制腐蝕的效果。
[Abstract]:In urban sewage environment, a large number of concrete structures to handle or transport sewage have been seriously corroded, causing the life of concrete to be damaged without the expected service life, among which the corrosion of the concrete is the most serious. In the study of concrete corrosion protection, the modification of concrete and the use of the surface coating are all The more passive measures can not fundamentally inhibit the formation of microbes, so in this paper, the more active measures used in concrete are applied in the concrete anticorrosion measures. In this paper, the artificial enhanced sewage was prepared by the anaerobic sludge of two sink, and the accelerated corrosion of the concrete was simulated by the microorganism. The test equipment of sewage corroded concrete is compared with the study of the corrosion performance and corrosion mechanism of different kinds of specimens in different kinds of sewage and different kinds of bactericides in different soaking environment of sewage and water, and the study of corrosion and corrosion mechanism of different kinds of specimens. Under the bubble environment, the first 28 d of flexural strength of concrete is increased and the growth rate is 7.1%. After more than 28 d, as the age increases, the strength of concrete begins to decrease continuously, the decline rate reaches 12.4%. when it reaches 150 D, and the flexural strength of concrete specimen is more obvious than that of anti pressure degree under the environment of sewage. The law of chemical properties is similar to the law of strength. The quality of the concrete specimens soaked in sewage is decreasing continuously. The mass loss rate reaches 2.24 per thousand and 6.73 per 1000 respectively to 28 d and 150 D, and the quality of the specimen in the water immersion is increasing, especially the upward trend in the first 8 weeks, and then gradually rising to 150 D. It shows that the specimens soaked in sewage are subjected to the corrosion of sewage. And for all soaking in the sewage soaking environment, the comparative study of partial soaking and pulp, mortar and concrete specimens found that the concrete soaked in the sewage is better than the concrete in the sewage. The order of corrosion resistance of the specimens is as follows: cement mortar concrete. On the one hand, the parts soaked in the sewage under the anaerobic environment are smaller than all soaked in sewage. On the other hand, the corrosion resistance of the material is worse due to the introduction of the aggregate to the interface. The twelve alkyl two methyl benzyl benzyl is mixed in the sewage. The effect of the concrete specimen of ammonium chloride is not ideal from the initial to the whole corrosion process, and its corrosion resistance is not even better than that of the non sterilizing agent in the sewage. Therefore, it is not suitable to be used as a bactericide in concrete. For the other two, the strength attenuation coefficient and the mass loss rate of the samples are reduced. The addition of fungicides can reduce the corrosion of sewage. The strength of the mixed bactericide in the sewage can be increased by 17.2% than that of the non sterilizing agent. The corrosion effect of the concrete with sodium bromide is obviously improved and the corrosion resistance is the best. The concrete test parts with sodium tungstate can also prevent the corrosion of the sewage, but the effect is not as good as bromination. The mass of sodium can reach about 80% of the sodium bromide test. The more sodium bromide test specimen is 84.6%. doped with sodium tungstate test, the pore structure of the specimen, which is soaked in water and sewage in different positions, is compared, and the XRD and scanning electron microscope pictures show that no sterilizing in sewage is found. In the environment of sewage, the content of CH decreased, the porosity and the number of large pore structure increased, the porosity of the cement stone in the sewage was about 1.5 times that of the clear water, and the structure of the non sterilizing agent in the sewage was loosened and the ettringite was formed. Effect.
【學(xué)位授予單位】：石家莊鐵道大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X799.3;TU528

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本文編號：1901790