本文選題：氯鹽 + 硫酸鹽��； 參考：《南京理工大學》2017年碩士論文

【摘要】：長期處于濱海鹽漬土環(huán)境下的混凝土結(jié)構(gòu)遭受著硫酸鹽和氯鹽等環(huán)境因素的侵蝕作用,引起混凝土損傷和鋼筋銹蝕,造成混凝土結(jié)構(gòu)耐久性不足,從而導致結(jié)構(gòu)的安全性降低,服役混凝土結(jié)構(gòu)提前失效,嚴重影響了工程結(jié)構(gòu)服役的安全性和可靠性。同時,摻加粉煤灰、礦渣、硅粉等礦物摻合料可制備性能優(yōu)越的混凝土。因此,研究礦物摻合料對鋼筋混凝土腐蝕進程的影響規(guī)律,對提高鹽漬土環(huán)境下混凝土結(jié)構(gòu)服役的安全性和可靠性意義重大。本文利用電化學測試方法,開展了不同礦物摻合料摻量和不同復(fù)摻比例鋼筋混凝土腐蝕進程的試驗測試,分析了不同礦物摻合料對鋼筋混凝土在不同腐蝕環(huán)境下的腐蝕進程的影響規(guī)律,主要得到以下研究成果:(1)硫酸鹽的存在一定程度上減緩試件在氯鹽腐蝕環(huán)境下的腐蝕速率,在腐蝕后期試件腐蝕速率加快,且最終腐蝕程度更加嚴重。(2)單摻礦渣、粉煤灰和復(fù)摻粉煤灰/礦渣的水泥漿體-鋼筋試件腐蝕速率均明顯減小,抗氯鹽和抗復(fù)合氯鹽與硫酸鹽腐蝕性能顯著提高,粉煤灰復(fù)合水泥漿體-鋼筋試件在單一氯鹽和氯鹽與硫酸鹽耦合腐蝕環(huán)境下發(fā)生鋼筋表面再鈍化現(xiàn)象,其二次水化的產(chǎn)物對鋼筋的鈍化具有顯著的促進作用。(3)20%礦渣對提高凈漿-鋼筋試件抗氯鹽腐蝕性能優(yōu)于抗復(fù)合氯鹽與硫酸鹽腐蝕性能;40%礦渣對提高凈漿-鋼筋試件的抗氯鹽腐蝕性能優(yōu)于抗氯鹽與硫酸鹽復(fù)合的腐蝕性能,但優(yōu)勢并不明顯;20%礦渣摻量對提高凈漿-鋼筋試件抗單一氯鹽腐蝕性能和抗復(fù)合氯鹽與硫酸鹽腐蝕性能均優(yōu)于40%礦渣摻量。(4)10%粉煤灰摻量和20%粉煤灰摻量對提高凈漿-鋼筋試件的抗氯鹽腐蝕性能和抗復(fù)合氯鹽與硫酸鹽腐蝕性能基本相當;10%粉煤灰摻量對提高凈漿-鋼筋試件抗單一氯鹽腐蝕性能和抗復(fù)合氯鹽與硫酸鹽腐蝕性能均優(yōu)于20%粉煤灰摻量,但優(yōu)勢均不明顯。(5)10%粉煤灰和10%礦渣摻量的復(fù)合水泥凈漿-鋼筋試件的抗氯鹽與硫酸鹽復(fù)合侵蝕性能強于其抗單一氯鹽侵蝕性能;而20%粉煤灰摻量和20%礦渣摻量的復(fù)合水泥凈漿-鋼筋試件的抗氯鹽腐蝕性能和抗復(fù)合氯鹽與硫酸鹽腐蝕性能基本相當;20%粉煤灰摻量和20%礦渣摻量復(fù)合水泥凈漿-鋼筋試件抗氯鹽腐蝕性能和抗復(fù)合氯鹽與硫酸鹽侵蝕性能均略優(yōu)于10%粉煤灰摻量和10%礦渣摻量復(fù)合水泥凈漿-鋼筋試件。
[Abstract]:For a long time, the concrete structure in the coastal saline soil environment has been eroded by environmental factors such as sulfate and chlorine salt, which causes concrete damage and steel bar corrosion, resulting in insufficient durability of concrete structure, which leads to the reduction of structural safety. The failure of concrete structures in service has seriously affected the safety and reliability of engineering structures. At the same time, the addition of fly ash, slag, silica and other mineral admixtures can be used to prepare concrete with superior performance. Therefore, it is of great significance to study the influence of mineral admixtures on the corrosion process of reinforced concrete and to improve the safety and reliability of concrete structures in saline soil. In this paper, the corrosion process of reinforced concrete with different mineral admixtures and different admixtures has been tested by electrochemical method. The effects of mineral admixtures on the corrosion process of reinforced concrete under different corrosion conditions were analyzed. The following research results were obtained: 1) the presence of sulphate to some extent slowed down the corrosion rate of specimens under chloride corrosion environment. In the late stage of corrosion, the corrosion rate of specimens is accelerated, and the final corrosion degree is more serious. The corrosion rate of cement paste and steel bar specimens with fly ash and fly ash / slag is obviously reduced. The corrosion resistance to chlorine salt and complex chloride salt and sulfate was improved significantly. The repassivation of steel bar surface occurred in the environment of single chloride salt and chloride salt and sulfate coupling corrosion. The product of secondary hydration has a remarkable promoting effect on the passivation of steel bar. 20% slag can improve the corrosion resistance of clean paste and steel bar to chlorine salt than to compound chloride salt and sulfate. 40% slag can improve the corrosion resistance of clean paste and steel bar. The corrosion resistance of the parts is better than that of the compound of chlorine salt and sulfate. But the advantages are not obvious. 20% slag content is superior to 40% slag content, 10% fly ash content and 20% fly ash content in improving the corrosion resistance to single chloride salt and compound chloride salt and sulfate corrosion resistance of pure paste and steel bar specimen. The corrosion resistance of paste to steel bar and the corrosion resistance of compound chlorine salt to sulfate are basically equal to that of 10% fly ash on improving the corrosion resistance of pure paste steel bar to single chloride salt and complex chloride salt and sulfate corrosion. Energy is better than 20% fly ash, But the advantages of 10% fly ash and 10% slag were not obvious. The composite corrosion resistance of composite cement paste and steel bar with 10% slag was better than that of single chloride salt. The corrosion resistance of composite cement paste with 20% fly ash and 20% slag is similar to that of composite cement paste with 20% fly ash and 20% slag. The corrosion resistance of rebar specimens to chloride salt and the corrosion resistance of composite chloride salt and sulfate are slightly better than that of 10% fly ash and 10% slag mixed cement paste and reinforced concrete specimens.
【學位授予單位】：南京理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU528

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