本文選題：氯鹽　切入點(diǎn)：硫酸鹽　出處：《江蘇科技大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：巖體隧道廣泛存在于我國各個地區(qū),對穿越障礙縮短行車?yán)锍烃Q緩解交通壓力做出巨大貢獻(xiàn),但其耐久性問題日益突出。對隧道混凝土耐久性影響最大的是硫酸鹽腐蝕,在絕大部分環(huán)境水中同時存在氯鹽與硫酸鹽相互作用。雙因素(硫酸鹽與氯鹽復(fù)合作用)腐蝕環(huán)境下巖體隧道襯砌的侵蝕效應(yīng)與同樣環(huán)境下軟土隧道侵蝕效應(yīng)相比具有明顯的不同,與單因素(氯鹽與硫酸鹽單獨(dú)作用)腐蝕環(huán)境下隧道襯砌的侵蝕效應(yīng)也有很大不同,同時隧道混凝土也受到碳化作用的侵蝕。本文針對隧道環(huán)境的實(shí)際情況,考慮多種因素(硫酸鹽氯鹽碳化)耦合作用,研究隧道混凝土單向侵蝕效應(yīng)及退化規(guī)律。本文對混凝土單方向半浸泡腐蝕進(jìn)行研究,在自然環(huán)境下銹蝕鋼筋,考慮不同腐蝕環(huán)境,即Na2SO4溶液(濃度為5%10%)與NaCl溶液(濃度為5%10%)之間相互組合以及碳化作用,分析多種因素耦合作用下隧道鋼筋混凝土的腐蝕性能退化規(guī)律,并對退化原因做出相應(yīng)的分析。(1)通過對純Na_2SO_4溶液與NaClNa2SO4混合溶液環(huán)境中腐蝕的混凝土試塊進(jìn)行超聲聲速測量,運(yùn)用公式計(jì)算出各組混凝土試塊的腐蝕層厚度,用以評價氯鹽對硫酸鹽腐蝕混凝土的抑制作用,并進(jìn)行XRD衍射分析及電鏡掃描。實(shí)驗(yàn)結(jié)果表明:通過對腐蝕層厚度變化的比較及微觀形態(tài)的觀察,都證實(shí)了Cl-的存在抑制了SO_4~(2-)對混凝土的腐蝕作用,并且隨著Cl-濃度增加抑制效果有一定程度增強(qiáng)。(2)研究碳化對雙因素腐蝕混凝土中SO_4~(2-)的擴(kuò)散影響,以及在多因素條件下混凝土力學(xué)性能和耐久性的變化規(guī)律。通過測量不同工況條件下,混凝土各深度SO_4~(2-)的濃度,研究SO_4~(2-)在混凝土中的擴(kuò)散規(guī)律,以及不同濃度情況下Cl-對SO_4~(2-)擴(kuò)散的影響,進(jìn)一步探究多因素條件下SO_4~(2-)對混凝土的腐蝕情況。結(jié)果表明:碳化促進(jìn)了SO_4~(2-)的擴(kuò)散速度,加劇了混凝土的腐蝕程度;多因素(碳化Cl-SO_4~(2-))對混凝土的腐蝕作用,碳化主要起促進(jìn)作用,Cl-起抑制作用,各種復(fù)雜因素的耦合作用還有待進(jìn)一步研究。(3)研究在氯鹽硫酸鹽雙因素耦合作用下,混凝土中鋼筋的腐蝕規(guī)律,主要對鋼筋銹蝕率和不同銹蝕率鋼筋抗拉性能的測定。結(jié)果表明:SO_4~(2-)的存在可以減輕Cl-對鋼筋的銹蝕,對抗拉性能也有一定影響。
[Abstract]:Rock mass tunnel exists widely in every area of our country. Shorter mileage? Traffic pressure relief has made a great contribution, but the durability problem is becoming increasingly prominent. The most important impact on the durability of tunnel concrete is sulphate corrosion. In most of the environmental water, the interaction of chloride and sulfate exists simultaneously. The corrosion effect of tunnel lining in rock mass under the condition of double factors (sulfate and chloride compound interaction) is similar to that of tunnel in soft soil in the same environment. Is obviously different, The corrosion effect of tunnel lining is different from that of single factor (chloride and sulfate alone), and the concrete of tunnel is also corroded by carbonization. Consider a variety of factors (sulfate? Chloride? In this paper, the unidirectional and semi-immersion corrosion of concrete in one direction is studied. In the natural environment, corrosion of steel bars is considered in different corrosion environments, that is, Na2SO4 solution (concentration 5? 10) and NaCl solution (concentration 5? The corrosion degradation law of tunnel reinforced concrete under the coupling action of various factors is analyzed, and the corresponding analysis of degradation cause is made. 1) through the analysis of pure Na_2SO_4 solution and NaCl-NaCl-1, the corrosion behavior of tunnel reinforced concrete under the coupling of various factors is analyzed by combining and carbonizing each other. The ultrasonic sound velocity measurement was carried out on the concrete samples corroded in the environment of Na2SO4 mixed solution. The thickness of corrosion layer of each group of concrete samples was calculated by using the formula to evaluate the inhibition effect of chloride salt on sulphate corroded concrete. The results of XRD diffraction and scanning electron microscopy show that the existence of Cl- inhibits the corrosion of concrete by comparing the thickness of corrosion layer and observing the microstructure of the corrosion layer. The effect of carbonation on the diffusion of so _ 4 / C _ 2 in double-factor corroded concrete was studied with the increase of Cl-concentration. And the variation law of mechanical properties and durability of concrete under multi-factor conditions. By measuring the concentration of so _ 4 / C _ 2 in different depths of concrete under different working conditions, the diffusion law of so _ 4 / C _ 2) in concrete is studied. And the effect of Cl-on SO4C2-diffusion at different concentrations, and further study on the corrosion of concrete under multi-factor conditions. The results show that carbonization promotes the diffusion rate of SO4C2-and intensifies the corrosion degree of concrete. Cl-? Carbonation plays an important role in inhibiting the corrosion of concrete. The coupling of various complex factors needs to be further studied. Under the coupling of sulfate with two factors, the corrosion law of steel bars in concrete is mainly determined on the corrosion rate of steel bars and the tensile properties of steel bars with different corrosion rates. The results show that the presence of 1 / so _ 4 / 2) can reduce the corrosion of steel bars by Cl-. Tensile resistance also has a certain impact on the performance.
【學(xué)位授予單位】：江蘇科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U454

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 詹文毅;江國慶;姜國民;葛存旺;田澍;李建華;;紫外分光光度法直接測定常量硫酸根[J];理化檢驗(yàn)(化學(xué)分冊);2016年02期

2 杜健民;李再婷;于貴霞;姬永生;;混凝土硫酸鹽腐蝕層厚度的超聲對測法研究[J];混凝土;2015年10期

3 張橋;劉改利;成聰慧;杜紅秀;;基于XRD對高強(qiáng)混凝土高溫后力學(xué)試驗(yàn)研究[J];混凝土與水泥制品;2015年03期

4 柳俊哲;孫武;巴明芳;賀智敏;陳劍斌;;碳化對水泥石中硫元素分布的影響[J];建筑材料學(xué)報(bào);2015年03期

5 楊蔚為;鄭永來;鄭順;;混凝土碳化對氯離子擴(kuò)散影響試驗(yàn)研究[J];水利水運(yùn)工程學(xué)報(bào);2014年04期

6 耿健;莫利偉;;碳化環(huán)境下礦物摻合料對固化態(tài)氯離子穩(wěn)定性的影響[J];硅酸鹽學(xué)報(bào);2014年04期

7 雷明鋒;彭立敏;施成華;;硫酸鹽侵蝕環(huán)境下隧道結(jié)構(gòu)力學(xué)性能演化規(guī)律試驗(yàn)研究[J];土木工程學(xué)報(bào);2013年01期

8 雷明鋒;彭立敏;施成華;;硫酸鹽侵蝕環(huán)境下隧道結(jié)構(gòu)損傷機(jī)制及力學(xué)性能演化規(guī)律[J];中南大學(xué)學(xué)報(bào)(自然科學(xué)版);2012年12期

9 杜健民;焦瑞敏;姬永生;;氯離子含量對混凝土硫酸鹽腐蝕程度的影響研究[J];中國礦業(yè)大學(xué)學(xué)報(bào);2012年06期

10 陳聰;楊林德;;地下結(jié)構(gòu)混凝土滲透特性試驗(yàn)研究[J];巖土力學(xué);2011年08期

相關(guān)博士學(xué)位論文 前2條

1 王波;氯鹽侵蝕鋼筋混凝土框架結(jié)構(gòu)失效機(jī)理和退化模型[D];中國礦業(yè)大學(xué);2012年

2 金祖權(quán);西部地區(qū)嚴(yán)酷環(huán)境下混凝土的耐久性與壽命預(yù)測[D];東南大學(xué);2006年

相關(guān)碩士學(xué)位論文 前2條

1 郝志虎;高速公路特長隧道群安全綜合評價研究[D];長安大學(xué);2008年

2 史長城;混凝土碳化與硫酸鹽腐蝕共同作用下混凝土耐久性試驗(yàn)研究[D];華北水利水電學(xué)院;2007年

，

本文編號：1607183