本文選題：海工水泥 + 水化產(chǎn)物��； 參考：《中北大學(xué)》2017年碩士論文

【摘要】：隨著國家對海洋資源和海疆安全越來越重視,海洋工程大量興建,混凝土作為海洋工程的基本結(jié)構(gòu)材料其穩(wěn)定性非常重要,不同于陸地環(huán)境,海水中存在大量的離子,其中有些對混凝土材料具有較強的腐蝕作用,本文針對海水中三種主要侵蝕離子:Cl-、Mg~(2+)和SO_4~(2-),根據(jù)其侵蝕機理不同分別進行實驗研究。通過C_3A、AFm與AFt之間相互轉(zhuǎn)化的關(guān)系,以及轉(zhuǎn)化條件進行研究,首先進行了熱力學(xué)理論分析,提出物質(zhì)轉(zhuǎn)化的理論基礎(chǔ);然后進行實驗驗證,包括通過高溫爐煅燒制成純度較高的C_3A,進行轉(zhuǎn)化實驗,并對得到的試樣進行XRD和SEM微觀分析,結(jié)果證明:無論是熱力學(xué)理論分析還是實際操作實驗C_3A與AFm可以在Cl-存在的環(huán)境下轉(zhuǎn)化為Fridel's鹽,而熱力學(xué)理論分析AFt并不能與Cl-反應(yīng)生成Fridel's鹽或者三氯鋁酸鹽,但是實驗得到的XRD衍射圖譜中卻發(fā)現(xiàn)了Fridel's鹽的存在,推測原因是鈣礬石轉(zhuǎn)化過程中不夠徹底,還存在一定量的C_3A或者AFm,或AFt與AFm存在一個動態(tài)平衡,他們之間可以相互轉(zhuǎn)化。對于Mg~(2+)和SO_4~(2-),本文進行了水泥膠砂試件浸沒于侵蝕離子溶液中不同齡期的腐蝕實驗,然后對各腐蝕齡期膠砂試塊進行了力學(xué)性能測試(抗折、抗壓),然后對凈漿試樣進行XRD、SEM、BET等微觀測試,結(jié)合微觀和宏觀分析了不同侵蝕離子對于不同水泥混凝土的侵蝕機理。結(jié)果證明普硅水泥在面對Mg~(2+)和SO_4~(2-)侵蝕的時候表現(xiàn)很差;礦渣水泥抗Mg~(2+)侵蝕能力表現(xiàn)較差,而抗SO_4~(2-)侵蝕能力相對普硅水泥要好一些;超硫酸鹽水泥相較于礦渣水泥擁有更好的抗Mg~(2+)和SO_4~(2-)侵蝕能力;硫鋁酸鹽基水泥由于其獨特的水化特性,在Mg~(2+)和SO_4~(2-)侵蝕的環(huán)境下,強度保持好,抗侵蝕能力也相對更好,自配硫鋁酸鹽A型和自配硫鋁酸鹽B型水泥從微觀以及宏觀相比較差別不大�？v向比較幾種水泥抗侵蝕能力,自配A型=自配B型超硫酸鹽水泥礦渣水泥普硅水泥。
[Abstract]:With the country paying more and more attention to the marine resources and the safety of the maritime boundary, a large number of marine projects have been built. As the basic structural material of marine engineering, the stability of concrete is very important. Different from the terrestrial environment, there are a lot of ions in the sea water. Some of them have a strong corrosion effect on concrete materials. In this paper, the corrosion mechanism of the three main erosion ions: Cl-mg2 and SO42- in seawater is studied experimentally according to their different erosion mechanisms. Based on the study of the relationship between C3Am and AFT and the transformation conditions, the thermodynamic theory analysis was carried out, the theoretical basis of material transformation was put forward, and the experiment was carried out to verify the relationship between C3Am and AFT. Including calcination of C3A with high purity by high temperature furnace, the conversion experiment was carried out, and the samples obtained were analyzed by XRD and SEM. The results show that C3A and AFM can be transformed into Fridels salt in the presence of Cl-, but the thermodynamics theory analysis can not react with Cl- to produce Fridels salt or trichloroaluminate. However, the existence of Fridels salt was found in the XRD diffraction patterns. The reason is that ettringite transformation is not thorough enough, and there is a certain amount of C 3A or AFM, or there is a dynamic equilibrium between AFT and AFM, and they can transform each other. For mg ~ (2) and so _ 4 ~ (2-), the corrosion tests of cement sand specimens immersed in different ages of corrosion ion solution were carried out. Then the microcosmic tests such as XRDX SEMT-BET were carried out, and the erosion mechanism of different corroded ions to different cement concrete was analyzed in combination with microscopic and macroscopic analysis. The results show that the performance of ordinary silicon cement is very poor in the face of Mg2 and SO42- erosion, the slag cement has poor corrosion resistance to Mg2, and the corrosion resistance of slag cement is better than that of ordinary silicon cement. Supersulphate cement has better corrosion resistance to Mg2 and SO42- than slag cement, and sulphoaluminate based cement has better strength and better corrosion resistance under Mg2 and SO42- erosion environment due to its unique hydration characteristics. Self-made sulphoaluminate A cement and self-made sulphoaluminate B cement have little difference in microscopic and macro phase. Longitudinal comparison of several kinds of cement corrosion resistance, self-made type A = self-made type B supersulphate cement slag cement silicon cement.
【學(xué)位授予單位】：中北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P755.3

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