發(fā)布時間：2018-05-05 12:22

  本文選題：鋼筋銹蝕 + 內摻型阻銹劑��； 參考：《內蒙古科技大學》2015年碩士論文

【摘要】：有機類復合型鋼筋阻銹劑是目前最具應用前景的阻銹劑種類，但該類阻銹劑成分復雜、品牌多樣，在相關研究中，不同人員對其阻銹效果的評價及阻銹機理的見解存在一定分歧。本文從有機類復合型鋼筋阻銹劑對混凝土物理性能和鋼筋銹蝕的影響出發(fā)，首先選用RCM試驗、電鏡掃描（SEM）以及XRD物相分析法綜合評價了阻銹劑對混凝土密實度的影響，分析其添加對有害離子滲透所起的抑制作用，并探尋了阻銹劑對混凝土物理性能產(chǎn)生改變的原因；然后選用鋼筋鹽水浸漬試驗、鋼筋混凝土浸烘試驗和鋼筋表面形貌觀測的方法評價了阻銹劑對鋼筋的緩蝕作用，，分析了阻銹劑對鋼筋表面鈍化膜致密度的影響，總結了阻銹劑的阻銹機理；最后用電化學試驗比較了不同添加情況下的阻銹劑對混凝土模擬液中碳鋼銹蝕的阻銹效果，篩選出最合理的組合方式。通過試驗，本文主要得到了如下結論： （1）有機類阻銹劑可使混凝土氯離子擴散系數(shù)降低，單獨添加內摻型阻銹劑、外涂型阻銹劑以及同時添加內摻性和外涂型阻銹劑的試樣所得氯離子擴散系數(shù)較空白組分別降低了16.8%、17.3%、23.5%。 （2）XRD物相分析圖表明，內摻型阻銹劑使混凝土內C3S和Ca(OH)2的衍射峰降低，促進了水泥的水化，含有減水劑成分。因此，在實際工程應用之前，需重視阻銹劑與其他外加劑的相容性分析，保證其對混凝土的物理性能無不良影響。 （3）試驗所選阻銹劑的阻銹機理為：①以促進混凝土水化或在混凝土微孔隙內形成沉淀的方式提高混凝土的密實性，減少有害離子的入侵；②阻銹分子吸附到鋼筋表面形成致密的鈍化膜，提高臨界氯離子濃度。 （4）鋼筋阻銹劑在混凝土結構的阻銹效果明顯，浸烘試驗結果表明，單獨添加內摻型阻銹劑、外涂型阻銹劑以及同時添加兩種阻銹劑的試樣所得鋼筋銹蝕率較空白組分別降低了43.3%、51.3%、64.5%。 （5）在混凝土模擬液試驗中，通過改變添加方式可得到阻銹劑的最佳組合方式，浸漬試驗、EIS測試以及Tafel極化曲線測試結果均表明，在測試開始便同時添加內摻型和外涂型阻銹劑的試樣所得效果最優(yōu)，阻銹效率分別為50.8%、54.1%、45.6%。
[Abstract]:The organic compound corrosion inhibitor for steel bar is the most promising corrosion inhibitor at present, but the composition of this kind of inhibitor is complex, the brand is diverse, in the related research, Different people have different opinions on the evaluation of rust inhibition effect and rust inhibition mechanism. In this paper, based on the effect of organic compound steel corrosion inhibitor on the physical properties of concrete and the corrosion of steel bar, RCM test, scanning electron microscope (SEM) and XRD phase analysis were used to evaluate the effect of rust inhibitor on the compactness of concrete. This paper analyzes on the inhibition effect of its addition on harmful ion penetration, and probes into the reasons for the change of the physical properties of concrete caused by rust inhibitor, and then selects the impregnation test of reinforced salt water to test the effect of corrosion inhibitor on the physical properties of concrete. The corrosion inhibition effect of corrosion inhibitor on steel bar was evaluated by immersion test of reinforced concrete and observation of steel bar surface morphology. The effect of corrosion inhibitor on the density of passivation film on steel bar surface was analyzed, and the corrosion inhibition mechanism of rust inhibitor was summarized. Finally, the corrosion inhibition effect of corrosion inhibitor on carbon steel in concrete simulated solution was compared by electrochemical experiments, and the most reasonable combination was selected. Through experiments, the main conclusions of this paper are as follows: 1) the diffusion coefficient of chloride ion in concrete can be reduced by organic rust inhibitor. The chloride diffusion coefficient of the sample with the addition of the inner-mixed rust inhibitor, the external rust inhibitor and the inner-mixed and outer-coated rust inhibitor can be reduced by 16.8and 17.3and 23.5respectively compared with the blank group. The diagram of phase analysis shows that the diffraction peaks of C _ 3s and Ca(OH)2 in concrete are decreased by adding rust inhibitor, which promotes the hydration of cement and contains water-reducing agent. Therefore, before the practical application, we should pay attention to the compatibility analysis of rust inhibitor and other admixtures to ensure that it has no adverse effect on the physical properties of concrete. 3) the corrosion inhibition mechanism of the corrosion inhibitor selected in the experiment is 1: 1 to improve the compactness of concrete and reduce the invasion of harmful ions by promoting the hydration of concrete or the formation of precipitation in the micropore of concrete. (2) the corrosion inhibitor molecules adsorbed on the surface of steel bar to form a dense passivation film, and the critical chlorine ion concentration was increased. (4) the corrosion resistance of steel bar in concrete structure is obvious. The results of soaking and drying test show that the corrosion rate of steel bar with the addition of inner-mixed rust inhibitor, external rust inhibitor and two kinds of corrosion inhibitor at the same time is decreased by 43.3% and 51.3%, respectively compared with the blank group, and the corrosion rate of steel bar is 64.5% lower than that of the blank group, and the results show that the corrosion rate of the steel bar is better than that of the control group. 5) the optimum combination of corrosion inhibitor can be obtained by changing the method of adding in the simulated liquid of concrete. The results of immersion test and Tafel polarization curve test show that, At the beginning of the test, the sample with both internal and external antirust agents has the best effect, and the corrosion inhibition efficiency is 50.8 and 54.1and 45.6, respectively.
【學位授予單位】：內蒙古科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU528.042.6

【參考文獻】

相關期刊論文 前10條

1 曹青;譚克鋒;袁偉;;礦物摻合料對水泥基材料氯離子固化能力影響的研究[J];四川建筑科學研究;2009年03期

2 耿國慶;施錦杰;孫偉;;混凝土模擬液中鋼筋腐蝕電化學測試結果比較[J];東南大學學報(自然科學版);2011年02期

3 馬新偉,邙靜U

本文編號：1847672