納米材料改性水泥基復(fù)合材料及其界面性能研究
發(fā)布時間：2019-02-12 20:17
【摘要】：納米材料作為一門新興的并在迅速發(fā)展的材料科學(xué),基于小尺寸效應(yīng)對材料物理化學(xué)性質(zhì)以及微觀結(jié)構(gòu)所產(chǎn)生的巨大影響而廣泛應(yīng)用于各個領(lǐng)域,成為當(dāng)今材料科學(xué)領(lǐng)域研究的熱點�；炷潦菓�(yīng)用最為廣泛的傳統(tǒng)型建筑材料,隨著人類社會的不斷進步和科學(xué)技術(shù)的日益發(fā)展,混凝土的應(yīng)用范圍越來越廣,對其使用性能亦提出了更高的要求。許多學(xué)者將納米材料摻入混凝土中,對其性能的改善得到了很好的效果。在眾多的納米材料中,納米二氧化鈦與納米二氧化硅具備良好的性能得到廣泛應(yīng)用。本文主要研究納米二氧化鈦與納米二氧化硅對水泥基復(fù)合材料宏觀性能的改性方法、改性效果以及改性機理。本文主要研究內(nèi)容具體包括以下方面:1.納米粒子對水泥基材料性能的改性效果及機理:將Ti O2納米顆粒摻入水泥中,對Ti O2納米顆粒改性水泥基材料的水化熱,水泥石的微觀形貌,元素分布,強度,抗?jié)B性能進行研究,結(jié)果表明Ti O2納米顆粒的摻入可以促進水泥早期的水化。同時通過matlab分析軟件將元素分布可視化,定量表征了納米材料和水泥水化產(chǎn)物分布狀態(tài),并分析了其相關(guān)性,揭示了納米材料對水泥凈漿早期和后期性能的作用機制。2.納米材料改性碳纖維:通過溶膠凝膠法制備納米Si O2改性溶液并分析了時間、溫度、PH值等不同影響因素對Si O2納米粒子粒徑的影響。通過熱重、XRD等手段表征分析了所制備的產(chǎn)物。然后對碳纖維表面進行氧化并溶膠凝膠納米Si O2表面接枝改性處理,觀測了不同溶膠凝膠溶液改性碳纖維的表面形貌,分析了改性前后碳纖維的Si元素含量的變化情況及其影響因素。3.改性碳纖維水泥復(fù)合材料界面性能研究:采用單絲拔出試驗,對改性纖維增強水泥基復(fù)合材料的界面性能進行測試;分析試驗結(jié)果,根據(jù)界面應(yīng)力傳遞的剪滯理論得到了纖維脫黏荷載的確定方法,對比分析改性纖維的界面增強效果和單絲拔出荷載-位移曲線的變化,結(jié)果表明改性纖維增強水泥基復(fù)合材料的界面強度得到顯著提高,通過改性碳纖維拔出后界面形貌和水化產(chǎn)物的觀測分析揭示了其強度提高機理。
[Abstract]:As a new and rapidly developing material science, nanomaterials are widely used in various fields based on the great influence of small size effect on the physical and chemical properties and microstructure of materials. It has become a hot spot in the field of material science. Concrete is the most widely used traditional building material. With the continuous progress of human society and the development of science and technology, the scope of application of concrete is becoming wider and wider. Many scholars have improved the properties of concrete by adding nano-materials to concrete. Among many nano-materials, nano-titanium dioxide and nano-silica have been widely used. In this paper, the modification methods, modification effects and modification mechanism of nano-TiO _ 2 and nano-silica on the macroscopical properties of cement matrix composites were studied. The main contents of this paper include the following aspects: 1. Modification effect and mechanism of nano-particles on properties of cement-based materials: incorporation of Ti O _ 2 nanoparticles into cement, hydration heat of cement based materials modified by Ti O _ 2 nanoparticles, microstructure, distribution of elements and strength of cement stones, The results show that the incorporation of Ti O 2 nanoparticles can promote the early hydration of cement. At the same time, the distribution of elements was visualized by matlab software, the distribution state of nano-material and cement hydration product was quantitatively characterized, and the correlation between them was analyzed, and the mechanism of the effect of nano-material on the early and late properties of cement paste was revealed. 2. Nanomaterials modified carbon fiber: Nano-sized Si O _ 2 modified solution was prepared by sol-gel method. The effects of time, temperature and PH value on the particle size of Si O _ 2 nanoparticles were analyzed. The products were characterized and analyzed by thermogravimetry and XRD. The surface morphology of carbon fiber modified by different sol-gel solutions was observed by surface modification of carbon fiber surface by oxidation and graft modification of sol-gel nano-sized Si O _ 2. The change of Si element content of carbon fiber before and after modification and its influencing factors were analyzed. Study on interfacial Properties of modified carbon Fiber reinforced cement Composites: the interfacial properties of modified fiber reinforced cement matrix composites were tested by single filament pull-out test. According to the shear lag theory of interfacial stress transfer, the determination method of fiber debonding load is obtained, and the effect of interfacial reinforcement and the change of drawing load-displacement curve of modified fiber are compared and analyzed. The results show that the interfacial strength of the modified fiber reinforced cement matrix composites has been greatly improved. The mechanism of the strength improvement is revealed by the morphology of the interface after the pullout of the modified carbon fiber and the observation and analysis of the hydration products.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB33
本文編號：2420753
[Abstract]:As a new and rapidly developing material science, nanomaterials are widely used in various fields based on the great influence of small size effect on the physical and chemical properties and microstructure of materials. It has become a hot spot in the field of material science. Concrete is the most widely used traditional building material. With the continuous progress of human society and the development of science and technology, the scope of application of concrete is becoming wider and wider. Many scholars have improved the properties of concrete by adding nano-materials to concrete. Among many nano-materials, nano-titanium dioxide and nano-silica have been widely used. In this paper, the modification methods, modification effects and modification mechanism of nano-TiO _ 2 and nano-silica on the macroscopical properties of cement matrix composites were studied. The main contents of this paper include the following aspects: 1. Modification effect and mechanism of nano-particles on properties of cement-based materials: incorporation of Ti O _ 2 nanoparticles into cement, hydration heat of cement based materials modified by Ti O _ 2 nanoparticles, microstructure, distribution of elements and strength of cement stones, The results show that the incorporation of Ti O 2 nanoparticles can promote the early hydration of cement. At the same time, the distribution of elements was visualized by matlab software, the distribution state of nano-material and cement hydration product was quantitatively characterized, and the correlation between them was analyzed, and the mechanism of the effect of nano-material on the early and late properties of cement paste was revealed. 2. Nanomaterials modified carbon fiber: Nano-sized Si O _ 2 modified solution was prepared by sol-gel method. The effects of time, temperature and PH value on the particle size of Si O _ 2 nanoparticles were analyzed. The products were characterized and analyzed by thermogravimetry and XRD. The surface morphology of carbon fiber modified by different sol-gel solutions was observed by surface modification of carbon fiber surface by oxidation and graft modification of sol-gel nano-sized Si O _ 2. The change of Si element content of carbon fiber before and after modification and its influencing factors were analyzed. Study on interfacial Properties of modified carbon Fiber reinforced cement Composites: the interfacial properties of modified fiber reinforced cement matrix composites were tested by single filament pull-out test. According to the shear lag theory of interfacial stress transfer, the determination method of fiber debonding load is obtained, and the effect of interfacial reinforcement and the change of drawing load-displacement curve of modified fiber are compared and analyzed. The results show that the interfacial strength of the modified fiber reinforced cement matrix composites has been greatly improved. The mechanism of the strength improvement is revealed by the morphology of the interface after the pullout of the modified carbon fiber and the observation and analysis of the hydration products.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB33
【參考文獻】
相關(guān)期刊論文 前1條
1 劉瑤;;玄武巖纖維混凝土耐久性研究及機理分析[J];山西建筑;2014年09期
，本文編號：2420753
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