發(fā)布時間：2018-11-21 12:33

【摘要】：海洋混凝土結(jié)構(gòu)如跨海大橋、海底隧道、穿江隧道、海洋鉆井平臺等常因海洋環(huán)境腐蝕而過早發(fā)生耐久性失效乃至破壞。因此，研究混凝土在長期海洋環(huán)境作用下的物理力學性能以及防腐措施顯得十分重要。本文以高性能混凝土為研究對象，系統(tǒng)研究了干濕循環(huán)條件下氯鹽侵蝕混凝土的抗?jié)B性能和力學性能以及涂層對混凝土的防護作用，主要研究成果如下： （1）通過對氯鹽侵蝕混凝土中不同深度處氯離子濃度的測定，得到了干濕循環(huán)腐蝕作用時間、防護涂層特性對混凝土氯離子滲透性能的影響規(guī)律，給出了氯離子擴散系數(shù)與干濕循環(huán)腐蝕作用時間的相互關(guān)系，由此建立了考慮時間因素的混凝土氯鹽侵蝕預計模型。 （2）通過單軸壓縮實驗，得到了氯鹽侵蝕混凝土的應力-應變曲線、抗壓強度、彈性模量以及峰值應變隨干濕循環(huán)腐蝕作用時間的變化規(guī)律；對比分析干濕循環(huán)作用下無涂層混凝土和三種表面涂層混凝土的力學性能，給出了涂層對氯鹽侵蝕混凝土抗蝕能力的影響規(guī)律。 （3）基于損傷力學，研究了氯鹽侵蝕對混凝土的損傷作用，得到了混凝土損傷程度隨干濕循環(huán)腐蝕作用時間的變化規(guī)律，給出了氯鹽侵蝕混凝土的損傷分布規(guī)律，，并構(gòu)建了氯鹽侵蝕混凝土單軸壓縮損傷本構(gòu)模型及方程。將本構(gòu)方程與氯鹽侵蝕混凝土單軸壓縮實驗結(jié)果對比，表明該本構(gòu)模型可較好地描述干濕循環(huán)條件下氯鹽侵蝕混凝土的損傷演化特性。 研究成果可為海工混凝土耐久性的理論研究與工程應用提供參考。
[Abstract]:Marine concrete structures such as cross-sea bridges, undersea tunnels, cross-river tunnels, offshore drilling platforms, and so on often occur premature durability failure and even damage due to marine environmental corrosion. Therefore, it is very important to study the physical and mechanical properties and anticorrosion measures of concrete under the action of long-term marine environment. In this paper, the impermeability and mechanical properties of chlorine salt corroded concrete under dry and wet cycle and the protective effect of coating on concrete are systematically studied. The main research results are as follows: (1) through the determination of chloride ion concentration at different depths of chloride salt corroded concrete, the effect of wet and dry cycle corrosion time and protective coating characteristics on chloride ion permeability of concrete is obtained. The relationship between chloride diffusion coefficient and dry and wet cycle corrosion time is given, and the prediction model of chloride corrosion in concrete considering time factor is established. (2) through uniaxial compression test, the stress-strain curve, compressive strength, elastic modulus and peak strain of chloride corroded concrete are obtained. The mechanical properties of uncoated concrete and three kinds of surface coated concrete under dry and wet cycling are analyzed. The influence of coating on corrosion resistance of chloride corroded concrete is given. (3) based on the damage mechanics, the damage effect of chloride erosion on concrete is studied. The damage degree of concrete varies with the time of dry and wet cycle corrosion, and the damage distribution law of chloride salt eroding concrete is given. The constitutive model and equation of uniaxial compression damage of chloride corroded concrete are established. By comparing the constitutive equation with the experimental results of uniaxial compression of chloride corroded concrete, it is shown that the constitutive model can well describe the damage evolution characteristics of chloride corroded concrete under dry and wet cycling conditions. The results can provide a reference for the theoretical research and engineering application of marine concrete durability.
【學位授予單位】：中國礦業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU528

【參考文獻】

相關(guān)期刊論文 前10條

1 劉儒平;蕭以德;蔣荃;周學杰;劉玉軍;鄭鵬華;;混凝土保護涂層抗氯離子滲透性研究[J];腐蝕科學與防護技術(shù);2006年02期

2 孫高霞;孫紅堯;陸采榮;;滲透性有機硅表面防護涂料的研究及應用現(xiàn)狀[J];腐蝕與防護;2009年07期

3 張煒煜;蔡志濱;楊醫(yī)博;江炳峰;郭文瑛;馬兆榮;陸曉琴;;環(huán)氧涂料在海工混凝土的應用進展[J];廣東建材;2011年02期

4 黃君哲,周欲曉,王勝年,潘德強;海工混凝土結(jié)構(gòu)表面涂層暴露試驗及應用效果[J];中國港灣建設(shè);2002年06期

5 羅昕;;海洋環(huán)境橋梁耐久性設(shè)計方法探討[J];世界橋梁;2008年S1期

6 姬永生;袁迎曙;;干濕循環(huán)作用下氯離子在混凝土中的侵蝕過程分析[J];工業(yè)建筑;2006年12期

7 孟濤;錢曉倩;詹樹林;錢匡亮;;海洋環(huán)境下聚合物對混凝土力學性能和抗氯離子滲透性能的影響研究[J];稀有金屬材料與工程;2008年S2期

8 閻西康;趙少偉;郭蓉;;海水侵蝕下鋼筋混凝土軸心受壓柱承載力試驗研究[J];河北工業(yè)大學學報;2006年03期

9 吳瑾,吳勝興;海洋環(huán)境下混凝土中鋼筋表面氯離子濃度的隨機模型[J];河海大學學報(自然科學版);2004年01期

10 F.H.Wittmann,趙鐵軍,戰(zhàn)洪艷;鋼筋混凝土的防水處理[J];混凝土;2004年06期

相關(guān)博士學位論文 前1條

1 吳慶令;海洋環(huán)境鋼筋混凝土受彎構(gòu)件的耐久性與壽命預測[D];南京航空航天大學;2010年

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