本文選題：海洋環(huán)境 + 鋼筋銹蝕��； 參考：《哈爾濱工業(yè)大學》2017年碩士論文

【摘要】：處于海洋和腐蝕環(huán)境中的建筑物,會受到環(huán)境中Cl-的侵蝕,使建筑物中鋼筋過早遭受銹蝕,發(fā)生破壞。影響鋼筋銹蝕速率的因素眾多,主要包括混凝土水膠比、摻和料用量、阻銹劑用量、鋼筋保護層厚度以及建筑物所處環(huán)境。本文針對以上幾種影響因素,設(shè)計了相關(guān)試驗,通過在Na Cl溶液中干濕循環(huán)來加速Cl-在混凝土中的擴散,測定在循環(huán)不同周期混凝土內(nèi)不同深度的氯離子含量來反映Cl-在混凝土內(nèi)部的傳輸過程,通過測試循環(huán)過程中的鋼筋腐蝕電流密度,來反映鋼筋銹蝕情況。試驗選用了0.35、0.4、0.45、0.5四個水膠比的試件,發(fā)現(xiàn)水膠比超過0.45混凝土氯離子擴散系數(shù)大幅增加。選用摻20%粉煤灰、摻40%粉煤灰、摻20%礦粉、摻40%礦粉、混摻粉煤灰和礦粉40%(1:1)五種類型的摻和料試件,發(fā)現(xiàn)摻加了摻和料的試件抗氯離子滲透能力排序為:粉煤灰20%混摻40%礦粉40%粉煤灰40%礦粉20%不摻,但摻加摻和料對混凝土強度有很大的影響。同時在混凝土養(yǎng)護初期,齡期對混凝土的氯離子擴散系數(shù)影響極大。試驗還研究了Si Ka Ferro Gard-901和YJ-504型阻銹劑對混凝土中鋼筋的阻銹效果和阻銹機理。選用15mm、25mm、35mm、45mm4種不同厚度的保護層,來研究各種因素對混凝土中鋼筋銹蝕的影響情況。研究發(fā)現(xiàn),Si Ka Ferro Gard-901和YJ-504型兩種阻銹劑對混凝土中鋼筋產(chǎn)生防護作用機理不同,前者主要通過在鋼筋表面生成一層保護膜來阻止鋼筋的銹蝕,而不會對混凝土性能產(chǎn)生影響;后者不僅通過產(chǎn)生的保護膜來防止鋼筋銹蝕,還很好的改善了混凝土結(jié)構(gòu)的性能。研究還發(fā)現(xiàn),水膠比0.4摻1%該阻銹劑的試件氯離子擴散系數(shù)約等于水膠比0.35的基準混凝土試件。保護層厚度對混凝土中鋼筋銹蝕情況影響顯著,通過增大保護層厚度是在海洋環(huán)境下防止鋼筋銹蝕的最佳方法。
[Abstract]:The buildings in the marine and corrosive environment will be eroded by the Cl- in the environment, so that the steel bars in the building are corroded and destroyed too early. There are many factors affecting the corrosion rate of steel bars, mainly including the concrete water to rubber ratio, the amount of admixture, the dosage of rust inhibitor, the thickness of the reinforcement protection layer and the environment of the building. Several influencing factors are designed. The diffusion of Cl- in concrete is accelerated through the dry and wet cycle in Na Cl solution. The content of chlorine ion in different depths of different cycles of concrete is measured to reflect the transmission process of Cl- in the concrete. By testing the corrosion current density of steel bars in the cycle process, the steel bar is reflected. The test of four water to rubber ratio of 0.35,0.4,0.45,0.5 was selected. It was found that the diffusion coefficient of water glue was more than 0.45 concrete, and the addition of 20% fly ash, 40% fly ash, 20% mineral powder, 40% mineral powder, mixed fly ash and mineral powder 40% (1:1) five types of admixture were found. The sorting of resistance to chloride ion is: fly ash 20% mixed with 40% mineral powder 40% fly ash and 40% mineral powder 20%, but adding admixture has a great influence on the strength of concrete. At the same time, the effect of age on the chloride diffusion coefficient of concrete is great. The experiment also studied the mixture of Si Ka Ferro Gard-901 and YJ-504 type rust inhibitor. The effect of corrosion resistance and rust resistance mechanism of reinforcement in the soil. Select the protective layers of 15mm, 25mm, 35mm and 45mm4 with different thickness to study the effect of various factors on the corrosion of reinforced concrete in concrete. It is found that the two kinds of Si Ka Ferro Gard-901 and YJ-504 type inhibitors have different protective mechanisms on the reinforcement of concrete in concrete. A layer of protection film is generated to prevent the corrosion of the steel bar, but it will not affect the performance of the concrete. The latter not only prevents the corrosion of the steel from the corrosion of the steel, but also improves the performance of the concrete structure. It is also found that the chloride diffusion coefficient of the test piece of the water glue is approximately equal to 0.35 of the water glue ratio 0.4. The thickness of the protective layer has a significant influence on the corrosion of the reinforced concrete in the concrete. By increasing the thickness of the protective layer, it is the best way to prevent the corrosion of the steel bar in the marine environment.

【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU528.042.6
，

本文編號：1780145