【摘要】：混凝土硫酸鹽侵蝕破壞被認(rèn)為是引起混凝土結(jié)構(gòu)劣化失效的四大主因之一，同時混凝土硫酸鹽侵蝕也是影響因素最復(fù)雜、危害性最大的一種環(huán)境水侵蝕。我國北方某些寒冷地區(qū)的水工及海工混凝土結(jié)構(gòu)，經(jīng)常承受凍融循環(huán)和鹽腐蝕雙重因素的作用；由于潮漲潮落，使部分混凝土建筑物長期承受干濕循環(huán)，，而海水或鹽漬土中又存在硫酸鹽，凍融和干濕循環(huán)條件下硫酸鹽侵蝕混凝土結(jié)構(gòu)的破壞在工程實例中也屢見不鮮。而混凝土材料的化學(xué)組成、微觀形態(tài)以及內(nèi)部結(jié)構(gòu)決定了其宏觀力學(xué)性能，開展硫酸鹽侵蝕混凝土微觀結(jié)構(gòu)的研究為進一步研究硫酸鹽侵蝕混凝土的性能退化規(guī)律等提供依據(jù)。 本文考慮侵蝕溶液陽離子種類的影響，采用“快凍法”進行了凍融條件下硫酸鹽侵蝕混凝土腐蝕試驗；考慮溶液濃度、水膠比、陽離子種類等因素的影響，開展了干濕循環(huán)條件下硫酸鹽侵蝕混凝土腐蝕試驗。采用X射線衍射（XRD）、掃描電鏡（SEM）以及TG-DSC綜合熱分析三種微觀試驗方法，對凍融及干濕循環(huán)條件下硫酸鹽侵蝕混凝土腐蝕產(chǎn)物進行了定性及定量分析。 通過試驗和分析，得出凍融條件和干濕循環(huán)條件下硫酸鹽侵蝕混凝土腐蝕產(chǎn)物主要是鈣礬石或石膏，隨著齡期的增長，硫酸根離子積聚到一定濃度，才開始有石膏產(chǎn)物生成，且混凝土硫酸鎂侵蝕與硫酸鈉侵蝕相比更加嚴(yán)重；干濕循環(huán)下硫酸鹽侵蝕混凝土水膠比越大，侵蝕溶液濃度越高越有利于腐蝕產(chǎn)物的生成；給出侵蝕混凝土同一深度處腐蝕產(chǎn)物含量變化規(guī)律以及不同侵蝕層中鈣礬石和石膏含量變化。
[Abstract]:Sulfate erosion of concrete is considered to be one of the four main causes of deterioration and failure of concrete structures. At the same time, sulfate erosion of concrete is the most complex and harmful environmental water erosion. Hydraulic and marine concrete structures in some cold areas of northern China are often subjected to the double factors of freeze-thaw cycle and salt corrosion, and some concrete buildings are subjected to dry and wet cycles for a long time due to the ebb and flow of the tide. There are sulfate in seawater or saline soil, and the damage of sulphate corroded concrete structure under freeze-thaw and dry-wet cycle is also common in engineering cases. The macroscopic mechanical properties of concrete are determined by its chemical composition, microscopic morphology and internal structure. The study of the microstructure of sulphate corroded concrete provides the basis for further study on the degradation law of the performance of sulfate corroded concrete. In this paper, the influence of cations in eroding solution is considered, and the corrosion test of sulphate corroded concrete under freeze-thaw condition is carried out by "quick freezing method", and the effects of concentration of solution, ratio of water to binder, kinds of cations and so on are taken into account. The corrosion test of sulphate corroded concrete under dry and wet cycle was carried out. The corrosion products of sulphate corroded concrete under freeze-thaw and dry-wet cycling conditions were qualitatively and quantitatively analyzed by X-ray diffraction (XRD),) scanning electron microscope (SEM) and comprehensive thermal analysis (TG-DSC). Through test and analysis, it is concluded that the corrosion products of sulphate corroded concrete under freeze-thaw conditions and dry and wet cycle conditions are mainly ettringite or gypsum. With the increase of age, sulphate ion accumulates to a certain concentration before gypsum products are formed. The higher the ratio of water to binder is, the higher the concentration of corrosion solution is, and the higher the concentration of corrosion solution is, the better the formation of corrosion products is, and the higher the ratio of water to binder is, the more serious the erosion of concrete is compared with the erosion of sodium sulfate. The changes of ettringite and gypsum contents in different erosive layers are given.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU528.0

【參考文獻】

中國期刊全文數(shù)據(jù)庫 前10條

1 劉崇熙;鈣礬石脫水過程中晶體結(jié)構(gòu)的演變[J];長江科學(xué)院院報;1989年03期

2 張麗;混凝土硫酸鹽侵蝕的機理及影響因素[J];東北公路;1998年04期

3 申春妮,楊德斌,方祥位,張濤;混凝土硫酸鹽侵蝕影響因素的探討[J];水利與建筑工程學(xué)報;2004年02期

4 王復(fù)生,孫瑞蓮,秦曉娟;察爾汗鹽湖條件下水泥混凝土耐久性調(diào)查研究[J];硅酸鹽通報;2002年04期

5 孫叢濤;牛荻濤;;混凝土抗鹽凍性能試驗研究[J];硅酸鹽通報;2010年04期

6 盧木;混凝土耐久性研究現(xiàn)狀和研究方向[J];工業(yè)建筑;1997年05期

7 何小芳;張亞爽;李小慶;劉玉飛;曹新鑫;;水泥水化產(chǎn)物的熱分析研究進展[J];硅酸鹽通報;2012年05期

8 張春玲,施連功;水工混凝土建筑物的凍融破壞與防治[J];黑龍江水專學(xué)報;2004年03期

9 馬保國,賀行洋,蘇英,陳友治,李永鑫,朱洪波;內(nèi)鹽湖環(huán)境中混凝土硫酸鹽侵蝕破壞研究[J];混凝土;2001年04期

10 黃戰(zhàn);邢鋒;邢媛媛;董必欽;羅帥;;硫酸鹽侵蝕對混凝土結(jié)構(gòu)耐久性的損傷研究[J];混凝土;2008年08期

中國博士學(xué)位論文全文數(shù)據(jù)庫 前2條

1 馬昆林;混凝土鹽結(jié)晶侵蝕機理與評價方法[D];中南大學(xué);2009年

2 徐惠;硫酸鹽腐蝕下混凝土損傷行為研究[D];中國礦業(yè)大學(xué);2012年

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