本文選題：鋼筋混凝土 + 耐久性��； 參考：《蘭州理工大學(xué)》2017年碩士論文

【摘要】：目前,鋼筋混凝土結(jié)構(gòu)在硫酸鹽和氯鹽的共同作用下耐腐蝕性研究較多,而在鎂鹽、硫酸鹽和氯鹽多因素耦合作用下的耐腐蝕性研究相對(duì)較少。同屬西部地區(qū),甘肅省酒泉地區(qū)是重鹽漬土地區(qū),青海省格爾木地區(qū)含有大量的鹽湖。在西部重鹽漬土和鹽湖地區(qū)普通硅酸鹽水泥鋼筋混凝土的腐蝕非常嚴(yán)重,鹽鹵侵蝕對(duì)鋼筋混凝土的耐久性和安全性產(chǎn)生了嚴(yán)重的威脅。鎂水泥具有不加改性的抗鹽鹵腐蝕的性能,同時(shí)西部鹽湖又有大量的鎂水泥原材料,所以研究它對(duì)西部鹽湖的開發(fā)有著重要的意義。由于鎂水泥本身對(duì)鋼筋有較強(qiáng)的腐蝕作用,本文采用涂層對(duì)鋼筋進(jìn)行保護(hù),研究鎂水泥鋼筋混凝土在西部地區(qū)抗鹽鹵腐蝕有著理論意義和社會(huì)經(jīng)濟(jì)價(jià)值。本文設(shè)計(jì)了6組鋼筋混凝土試塊,分別為Mg-GHT(鎂水泥混凝土-環(huán)氧樹脂涂層鋼筋)、Mg-B(鎂水泥混凝土-裸露鋼筋)、P.O.1-GHT(配比1硅酸鹽水泥混凝土-環(huán)氧樹脂涂層鋼筋)、P.O.1-B(配比1硅酸鹽水泥混凝土-裸露鋼筋)、P.O.2-GHT(配比2硅酸鹽水泥混凝土-環(huán)氧樹脂涂層鋼筋)、P.O.2-B(配比2硅酸鹽水泥混凝土-裸露鋼筋)。采用電化學(xué)方法、電阻法、室內(nèi)快速腐蝕試驗(yàn)和現(xiàn)場(chǎng)暴露試驗(yàn)的方法對(duì)鋼筋混凝土基于不同膠凝材料的耐蝕性試驗(yàn)研究。研究?jī)?nèi)容和成果有:1.定期對(duì)長(zhǎng)期浸泡于耦合溶液中的試塊進(jìn)行電化學(xué)檢測(cè),通過(guò)極化曲線和交流阻抗分析研究了混凝土中鋼筋抗氯鹽、硫酸鹽和鎂鹽的腐蝕規(guī)律,得出在耦合鹽溶液中Mg-GHT抗腐蝕能力優(yōu)于P.O-B。2.模擬了酒泉和格爾木地區(qū)的實(shí)際環(huán)境,考慮了凍融循環(huán)、紫外線照射等因素,設(shè)計(jì)了室內(nèi)大循環(huán)快速腐蝕試驗(yàn)和現(xiàn)場(chǎng)暴露試驗(yàn)。定期檢測(cè)了混凝土波速、質(zhì)量和鋼筋電阻,以混凝土的相對(duì)動(dòng)彈性模量評(píng)價(jià)參數(shù)ω1、鋼筋混凝土的相對(duì)質(zhì)量評(píng)價(jià)參數(shù)ω2、作為基本耐久性評(píng)價(jià)指標(biāo)。為了能夠可觀的反應(yīng)鋼筋混凝土的腐蝕程度設(shè)計(jì)了鋼筋的平均截面未銹蝕評(píng)價(jià)參數(shù)ω3及鋼筋混凝土的損傷程度評(píng)價(jià)參數(shù)ω為評(píng)價(jià)指標(biāo)。分析了鋼筋混凝土抗氯鹽、硫酸鹽和鎂鹽的腐蝕規(guī)律,得出在鹽鹵侵蝕的環(huán)境下鎂水泥涂層鋼筋混凝土抗腐蝕能力優(yōu)于硅酸鹽水泥裸露鋼筋混凝土。3.結(jié)合EDS能譜分析和SEM電鏡掃描,分析了鋼筋混凝土腐蝕后的產(chǎn)物,確定生成物的微觀結(jié)構(gòu)相貌及組成成分,并進(jìn)一步分析了鋼筋混凝土腐蝕機(jī)理及規(guī)律。通過(guò)以上研究得出在鹽湖和重鹽漬土環(huán)境下鎂水泥涂層鋼筋混凝土比硅酸鹽水泥裸露鋼筋混凝土更具有優(yōu)越性。由于鎂水泥混凝土自身比較密實(shí),其制約了外部環(huán)境中腐蝕性離子的滲入,所以在鎂水泥原材料豐富的地區(qū)可以考慮使用鎂水泥涂層鋼筋混凝土。
[Abstract]:At present, the corrosion resistance of reinforced concrete structures under the combined action of sulfate and chloride is much studied, but the corrosion resistance of reinforced concrete structures under the coupling of magnesium salt, sulfate and chlorine salt is relatively few. The Jiuquan area of Gansu Province is a heavy saline land area, and the Golmud area of Qinghai Province contains a large number of salt lakes. The corrosion of common Portland cement reinforced concrete in the western heavy saline soil and salt lake area is very serious, and the salt and halogen corrosion is a serious threat to the durability and safety of reinforced concrete. Magnesium cement has the property of resisting salt and halogen corrosion without modification, and at the same time, there are a lot of magnesium cement raw materials in western salt lake, so it is of great significance to study it for the development of western salt lake. Since magnesium cement has a strong corrosion effect on steel bars, it is of theoretical significance and social and economic value to study the resistance of magnesium cement reinforced concrete to salt and halogen corrosion in the western region. In this paper, six groups of reinforced concrete test blocks are designed. Mg-GHTMg-B (magnesium cement concrete / epoxy resin coated steel bar) P.O.1-GHT (ratio 1 Portland cement concrete-epoxy resin coated steel bar) P.O.1-B (ratio 1 Portland cement concrete-exposed steel bar) Ratio 2 Portland cement concrete-epoxy resin coated steel bar P.O.2-B (ratio 2 Portland cement concrete-bare steel bar). The corrosion resistance of reinforced concrete based on different cementing materials was studied by electrochemical method, resistance method, indoor rapid corrosion test and field exposure test. The contents and results of the study are as follows: 1. The corrosion resistance of steel bars to chloride, sulfate and magnesium in concrete was studied by polarization curve and AC impedance analysis. The results show that the corrosion resistance of Mg-GHT in coupling salt solution is better than that of P.O-B.2. The actual environment in Jiuquan and Golmud area was simulated and the factors such as freeze-thaw cycle ultraviolet radiation and so on were considered. The indoor rapid corrosion test and field exposure test were designed. The wave velocity, mass and steel resistance of concrete are measured periodically. The relative dynamic modulus of concrete (蠅 1) and the relative quality of reinforced concrete (蠅 2) are taken as the basic durability evaluation index. In order to reflect the corrosion degree of reinforced concrete, the evaluation parameters 蠅 3 of average section and 蠅 3 of damage degree of reinforced concrete are designed. The corrosion resistance of reinforced concrete to chloride, sulfate and magnesium salt is analyzed. It is concluded that the corrosion resistance of reinforced concrete coated with magnesium cement is better than that of exposed reinforced concrete with Portland cement under the environment of salt and halogen erosion. Combined with EDS energy spectrum analysis and SEM scanning electron microscope, the corrosion products of reinforced concrete were analyzed, the microstructure and composition of the product were determined, and the corrosion mechanism and law of reinforced concrete were further analyzed. It is concluded that magnesium cement coated reinforced concrete is superior to Portland cement exposed reinforced concrete in salt lake and heavy saline soil. Because the magnesium cement concrete itself is relatively dense, it restricts the infiltration of corrosive ions in the external environment, so the use of magnesium cement coated reinforced concrete can be considered in the areas rich in magnesium cement raw materials.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU528.571

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