【摘要】：在混凝土表面敷設(shè)有機(jī)成膜涂層來(lái)提高混凝土的抗碳化能力是一種既簡(jiǎn)便又有效的方法,具有廣闊的應(yīng)用前景。本文選擇了環(huán)氧富鋅底漆、環(huán)氧云鐵中間漆、聚氨酯面漆、環(huán)氧樹脂面漆和氯化橡膠面漆等五種常見的有機(jī)涂料,以有機(jī)成膜涂層混凝土為研究對(duì)象,采用紫外加速老化和室外自然暴露老化方法對(duì)混凝土表面涂層進(jìn)行老化。對(duì)老化前后的涂層混凝土進(jìn)行加速碳化實(shí)驗(yàn),系統(tǒng)地研究了涂層對(duì)混凝土抗碳化性能的影響。針對(duì)涂層易老化的特性,利用納米SiO_2對(duì)涂層進(jìn)行改性。通過(guò)加速碳化和紫外老化實(shí)驗(yàn),研究了改性涂層的碳化防護(hù)能力和紫外老化性能。通過(guò)涂層性能實(shí)驗(yàn)對(duì)改性涂層防護(hù)性能進(jìn)行驗(yàn)證,結(jié)合微觀實(shí)驗(yàn)對(duì)改性涂層防護(hù)機(jī)理進(jìn)行分析。通過(guò)對(duì)涂層混凝土碳化實(shí)驗(yàn)研究,有以下發(fā)現(xiàn):在同一涂層體系厚度下,涂層體系碳化防護(hù)能力排序?yàn)?聚氨酯涂層體系環(huán)氧樹脂涂層體系氯化橡膠涂層體系;涂層混凝土抗碳化性能不僅與涂層有關(guān),還與基層混凝土水灰比有關(guān)。混凝土水灰比越低,涂層體系對(duì)混凝土的碳化防護(hù)貢獻(xiàn)越小;混凝土碳化深度隨著涂層體系厚度的增加呈指數(shù)函數(shù)減小。通過(guò)對(duì)老化后涂層混凝土碳化實(shí)驗(yàn)的研究,有以下發(fā)現(xiàn):在同一涂層體系厚度下,涂層體系抗老化能力排序?yàn)?聚氨酯體系環(huán)氧樹脂體系氯化橡膠體系;在紫外老化中,涂層體系的防碳化能力隨著紫外輻照量的增加呈S型曲線退化;在自然老化中,涂層體系的防碳化能力隨著自然老化時(shí)間的增加呈拋物線退化;建立了涂層體系在紫外老化條件下的壽命預(yù)測(cè)方法,并推導(dǎo)出涂層體系在自然條件下的使用壽命;通過(guò)微觀實(shí)驗(yàn)發(fā)現(xiàn),涂層老化主要是由于涂膜發(fā)生降解,產(chǎn)生顆粒物、細(xì)小孔隙和裂紋。通過(guò)對(duì)納米改性涂層的研究,有以下發(fā)現(xiàn):納米SiO_2能夠有效改善涂層混凝土抗碳化性能,且納米Si O_2對(duì)氯化橡膠涂層改善效果好于環(huán)氧樹脂和聚氨酯;各涂層的最佳納米SiO_2摻量在0.4%-1.2%之間,當(dāng)納米SiO_2摻量超過(guò)最佳摻量后,改性涂層的碳化防護(hù)效果逐漸降低;納米Si O_2可以有效改善涂層的抗紫外老化性能,納米SiO_2摻量在0.4%-1.2%之間效果最好;改性后涂層的耐腐蝕和憎水性能明顯提高;加入納米Si O_2后涂膜得到有效填充,涂膜孔隙明顯減少,在紫外光照下涂膜破壞明顯降低。通過(guò)理論分析和實(shí)驗(yàn)數(shù)據(jù)回歸分析,推導(dǎo)出了有機(jī)成膜涂層體系混凝土的碳化微分方程;建立了涂層體系當(dāng)量混凝土厚度和擴(kuò)散系數(shù)計(jì)算公式;利用MATLAB編程求出混凝土碳化微分方程數(shù)值解;對(duì)連續(xù)復(fù)涂涂層后混凝土碳化深度進(jìn)行了預(yù)測(cè)。
[Abstract]:It is a simple and effective method to apply organic film coating on the surface of concrete to improve the carbonation resistance of concrete. In this paper, five kinds of common organic coatings, such as epoxy zinc rich primer, epoxy cloud iron intermediate paint, polyurethane top paint, epoxy resin top paint and chlorinated rubber top paint, are selected. The organic film-forming coating concrete is taken as the research object. UV accelerated aging and outdoor natural exposure aging were used to aging the surface coating of concrete. The effect of coating on carbonation resistance of concrete was studied systematically by accelerated carbonization experiment before and after aging. The coating was modified by nanometer SiO_2 in allusion to the aging property of the coating. The carbonation protection and UV aging properties of the modified coatings were studied by accelerated carbonization and UV aging experiments. The protective performance of the modified coating was verified by the performance experiment of the coating, and the protective mechanism of the modified coating was analyzed in combination with the microscopic experiment. Through the experimental study on the carbonization of coated concrete, the following results are found: under the same coating system thickness, the carbonation protection ability of the coating system is ranked as follows: polyurethane coating system, epoxy resin coating system, chlorinated rubber coating system; The carbonation resistance of the coated concrete is not only related to the coating, but also to the water cement ratio of the base concrete. The lower the water-cement ratio of concrete, the smaller the contribution of the coating system to the carbonation protection of concrete, and the less the carbonation depth of concrete decreases with the increase of the thickness of the coating system. Through the study of carbonization experiment of aged coated concrete, it is found that under the same coating system thickness, the anti-aging ability of the coating system is ranked as follows: polyurethane system, epoxy resin system, chlorinated rubber system, UV aging, The anti-carbonation ability of the coating system degenerates with the increase of UV irradiation, and the anti-carbonation ability of the coating system degenerates with the increase of the natural aging time. The life prediction method of coating system under ultraviolet aging condition was established, and the service life of coating system under natural condition was deduced. Small pores and cracks. Through the study of nano-modified coatings, it is found that nano-sized SiO_2 can effectively improve the carbonation resistance of coated concrete, and nano-SiO2 can improve the coating of chlorinated rubber better than epoxy resin and polyurethane. The optimum SiO_2 content of each coating is between 0.4% and 1.2%. When the content of nano-SiO _ 2 exceeds the optimum content, the carbonation and protection effect of the modified coating decreases gradually, and nano-SiO _ 2 can effectively improve the anti-UV aging performance of the coating. The effect of nano-scale SiO_2 was the best in the range of 0.4- 1.2%; the corrosion resistance and hydrophobicity of the modified coating were improved obviously; the coating film was filled effectively after adding nano-SiO-2, the pore of coating film was obviously reduced, and the damage of coating film was obviously reduced under ultraviolet light. Through theoretical analysis and experimental data regression analysis, the carbonation differential equation of organic film coated concrete is deduced, and the calculation formula of equivalent concrete thickness and diffusion coefficient of coating system is established. The numerical solution of concrete carbonation differential equation is obtained by MATLAB programming, and the carbonation depth of concrete after continuous coating is predicted.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU528

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 陳建壯;柏朱安;李果;;有機(jī)成膜涂層混凝土抗碳化能力改善的定量評(píng)價(jià)[J];公路;2016年04期

2 伍雪;趙宏斌;韓雨杉;胡敏;高爽;孫巖;徐銳;錢傳云;;我國(guó)部分地區(qū)紫外輻射強(qiáng)度、日照時(shí)間與骨密度關(guān)系的比較[J];昆明醫(yī)科大學(xué)學(xué)報(bào);2015年11期

3 李果;雷明;楊璞;趙文強(qiáng);王博陽(yáng);;老化對(duì)涂層混凝土抗碳化性能的影響[J];徐州工程學(xué)院學(xué)報(bào)(自然科學(xué)版);2013年02期

4 韓永奇;;2013年中國(guó)涂料發(fā)展趨勢(shì)[J];上海建材;2013年03期

5 李果;董晶;楊璞;;防腐涂層對(duì)混凝土抗碳化性能的影響[J];山東科技大學(xué)學(xué)報(bào)(自然科學(xué)版);2013年02期

6 鄒群;水中和;蕭以德;;表面有機(jī)涂裝對(duì)提高混凝土耐久性的研究[J];腐蝕科學(xué)與防護(hù)技術(shù);2012年05期

7 鄭愛剛;楊光;許文;王璇;;氯化橡膠涂層人工加速條件下的老化機(jī)理[J];宇航材料工藝;2011年04期

8 雷西萍;;聚羧酸減水劑對(duì)礦渣水泥性能影響的研究[J];硅酸鹽通報(bào);2010年06期

9 石亮;劉建忠;劉加平;;聚合物涂層對(duì)混凝土碳化的影響及作用機(jī)理[J];東南大學(xué)學(xué)報(bào)(自然科學(xué)版);2010年S2期

10 開永旺;邢建鑫;;混凝土碳化分析及防治方法[J];鐵道建筑;2010年07期

相關(guān)碩士學(xué)位論文 前8條

1 郭盟;低聚物改性納米二氧化硅及其在光固化聚氨酯體系中的應(yīng)用研究[D];江南大學(xué);2014年

2 段東方;納米TiO_2的制備及對(duì)外墻涂料表面改性研究[D];重慶大學(xué);2013年

3 侯玉婧;改性納米二氧化硅用于丙烯酸聚氨酯防腐涂料的實(shí)驗(yàn)研究[D];華北電力大學(xué);2012年

4 劉芳;表面成膜型涂料對(duì)混凝土保護(hù)層性能的影響研究[D];南京林業(yè)大學(xué);2008年

5 陳立亭;混凝土碳化模型及其參數(shù)研究[D];西安建筑科技大學(xué);2007年

6 閆雷鴿;聚丙烯/有機(jī)蒙脫土納米復(fù)合材料的制備及性能研究[D];四川大學(xué);2006年

7 鄧洪達(dá);典型大氣環(huán)境中有機(jī)涂層老化行為及其室內(nèi)外相關(guān)性的研究[D];機(jī)械科學(xué)研究院;2005年

8 謝東升;高性能混凝土碳化特性及相關(guān)性能的研究[D];河海大學(xué);2005年

，

本文編號(hào)：2197438