本文關(guān)鍵詞： 氯離子滲透性 應(yīng)力 干濕循環(huán) SDWM模型 耦合作用　出處：《中國建筑材料科學(xué)研究總院》2013年博士論文　論文類型：學(xué)位論文

【摘要】：目前世界范圍內(nèi)混凝土結(jié)構(gòu)的耐久性問題日益凸顯，受到各國科技人員和工業(yè)界的普遍重視。荷載和外界環(huán)境因素是影響混凝土結(jié)構(gòu)耐久性的主要因素，研究應(yīng)力及干濕循環(huán)條件下混凝土中氯離子的滲透性及其變化規(guī)律，并對處于該條件下混凝土結(jié)構(gòu)的服役壽命進(jìn)行預(yù)測，具有較高的實(shí)用價(jià)值。本文對這一課題進(jìn)行了探索，研究內(nèi)容和取得的成果如下： 評價(jià)并改進(jìn)了混凝土中氯離子滲透性應(yīng)力加載裝置，設(shè)計(jì)了應(yīng)力條件下氯離子滲透性測試方法，實(shí)現(xiàn)了應(yīng)力條件下混凝土中氯離子滲透性的快速測定。應(yīng)力加載裝置創(chuàng)新地采用碟簧加載的方式實(shí)現(xiàn)了對混凝土施加應(yīng)力，借助應(yīng)力傳感器實(shí)現(xiàn)了裝置的應(yīng)力適時(shí)調(diào)控與恒載。氯離子滲透性測試方法首次將應(yīng)力加載裝置與NEL法和電通量法進(jìn)行有效的結(jié)合（即CPS-NEL法和CPS-ASTM C1202法）。該方法具有操作快捷、評定準(zhǔn)確和實(shí)用的特點(diǎn)，是一種用于評價(jià)氯離子在混凝土內(nèi)滲透性的新型方法。 系統(tǒng)分析了應(yīng)力條件下氯離子在混凝土中的滲透行為。采用CPS-NEL法和CPS-ASTM C1202法，對氯離子在C30和C60混凝土中的滲透性進(jìn)行了研究，分析了應(yīng)力大�。☉�(yīng)力比為0.1，0.3，0.5，0.7）和應(yīng)力種類（拉應(yīng)力和壓應(yīng)力）對滲透性的影響，得出了應(yīng)力條件下混凝土中氯離子的滲透規(guī)律，獲得了混凝土中氯離子滲透性變化的閾值應(yīng)力比。 研究了應(yīng)力和干濕循環(huán)耦合作用下的混凝土中氯離子滲透性變化規(guī)律，創(chuàng)新地建立和論證了考慮應(yīng)力和干濕循環(huán)因素的氯離子滲透模型。通過對混凝土中氯離子濃度的測試，分析了應(yīng)力和干濕循環(huán)對混凝土滲透性的影響，，同時(shí)采用基于硝酸銀顯色法對應(yīng)力和干濕循環(huán)耦合作用下的氯離子滲透規(guī)律進(jìn)行了驗(yàn)證。在Fick第二定律的基礎(chǔ)上建立了應(yīng)力和干濕循環(huán)耦合作用下的氯離子滲透模型（SDWM模型），并對SDWM模型的計(jì)算值和混凝土內(nèi)部氯離子濃度的實(shí)測值進(jìn)行了驗(yàn)證，結(jié)果證實(shí)SDWM模型具有較高的可靠性。 依據(jù)超聲波、SEM和MIP等測試設(shè)備，分析了混凝土中內(nèi)部損傷對氯離子滲透性能的影響。利用超聲波法聲學(xué)參數(shù)變化曲線對應(yīng)力作用下混凝土內(nèi)部的損傷進(jìn)行了分析；利用SEM法觀察了拉應(yīng)力和干濕循環(huán)耦合作用下的混凝土內(nèi)部微觀形貌變化；采用MIP法對拉應(yīng)力和干濕循環(huán)耦合作用下混凝土的孔隙率和孔徑分布進(jìn)行了測試，對其變化規(guī)律進(jìn)行了分析。超聲波、SEM和MIP法測試結(jié)果解釋了應(yīng)力和干濕循環(huán)耦合作用下混凝土滲透性的變化規(guī)律。 基于在應(yīng)力和干濕循環(huán)因素作用下建立的SDWM模型，對實(shí)體機(jī)構(gòu)進(jìn)行了壽命預(yù)測。采用“PERMIT”法對實(shí)體結(jié)構(gòu)滲透性進(jìn)行了測試，通過SDWM模型，計(jì)算出混凝土中與鋼筋接觸界面處在不同齡期時(shí)的氯離子濃度，根據(jù)鋼筋腐蝕時(shí)的氯離子臨界濃度值對實(shí)體結(jié)構(gòu)的服役壽命進(jìn)行了預(yù)測。
[Abstract]:At present, the durability of concrete structures in the world is becoming more and more prominent, which has been paid more and more attention by scientists and industry. Load and environmental factors are the main factors that affect the durability of concrete structures. The permeability and variation of chloride ions in concrete under the conditions of stress and dry-wet circulation are studied, and the service life of concrete structures under these conditions is predicted. This paper explores this subject, and the research contents and results are as follows: The chlorine ion permeability stress loading device in concrete is evaluated and improved, and the method of chloride ion permeability testing under stress condition is designed. The rapid measurement of chloride permeability in concrete under stress conditions is realized. The stress loading device innovatively applies the stress to concrete by the method of disc spring loading. The stress timely control and dead load are realized by means of stress sensor. The stress loading device is effectively combined with NEL method and electric flux method for the first time. That is, CPS-NEL method and CPS-ASTM C1202 method. Accurate and practical evaluation is a new method for evaluating the permeability of chloride ions in concrete. The permeation behavior of chloride ions in concrete under stress conditions was systematically analyzed. CPS-NEL method and CPS-ASTM C1202 method were used. The permeability of chloride ions in C30 and C60 concrete is studied, and the magnitude of stress (stress ratio is 0.1g / 0.3 / 0.5) is analyzed. The influence of the types of stress (tensile stress and compressive stress) on the permeability of concrete is obtained. The permeability law of chloride ions in concrete under stress conditions is obtained, and the threshold stress ratio of chloride ion permeability change in concrete is obtained. The variation of chloride ion permeability in concrete under the coupling of stress and dry-wet cycle is studied. The chloride permeation model considering stress and dry-wet cycle factors was established and proved. The influence of stress and wet cycle on the permeability of concrete was analyzed by testing the chloride ion concentration in concrete. At the same time, the chloride ion permeation law under the coupling of stress and dry-wet cycle was verified by silver nitrate coloration method. Based on the second law of Fick, the chlorine separation under the coupling of stress and dry-wet cycle was established. Subosmotic model (. SDWM model. The calculated values of SDWM model and the measured values of chloride concentration in concrete are verified. The results show that the SDWM model has high reliability. According to ultrasonic testing equipment, such as SEM and MIP. The influence of internal damage on chloride permeability in concrete is analyzed. The damage of concrete under stress is analyzed by ultrasonic acoustic parameter change curve. The microstructure of concrete under the coupling of tensile stress and wet and dry cycle was observed by SEM method. The porosity and pore size distribution of concrete under the coupling of tensile stress and dry-wet cycle were measured by MIP method. The results of SEM and MIP methods explain the variation of the permeability of concrete under the coupling of stress and dry-wet cycle. Based on the SDWM model established under the action of stress and dry-wet cycle, the life of solid mechanism was predicted. The permeability of solid structure was tested by "PERMIT" method. Through SDWM model, the concentration of chloride ion in concrete at different ages is calculated. The service life of solid structure is predicted according to the critical concentration of chloride ion in steel bar corrosion.
【學(xué)位授予單位】：中國建筑材料科學(xué)研究總院
【學(xué)位級別】：博士
【學(xué)位授予年份】：2013
【分類號】：TU528.0

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 喬巍;姬永生;張博雅;馬會榮;張領(lǐng)雷;;海洋潮汐區(qū)混凝土中氯離子傳輸過程的試驗(yàn)室模擬方法[J];四川建筑科學(xué)研究;2012年03期

2 王懷亮;宋玉普;;不同尺寸混凝土試件受壓狀態(tài)下超聲波傳播特性研究[J];大連理工大學(xué)學(xué)報(bào);2007年01期

3 郝挺宇;惠云玲;梅名虎;蘇波;;結(jié)構(gòu)混凝土耐久性無損檢測技術(shù)[J];東南大學(xué)學(xué)報(bào)(自然科學(xué)版);2006年S2期

4 余紅發(fā);孫偉;;混凝土氯離子擴(kuò)散理論模型[J];東南大學(xué)學(xué)報(bào)(自然科學(xué)版);2006年S2期

5 衛(wèi)軍;余t

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