纳米材料改性水泥基复合材料及其界面性能研究
发布时间：2019-02-12 20:17
【摘要】：纳米材料作为一门新兴的并在迅速发展的材料科学,基于小尺寸效应对材料物理化学性质以及微观结构所产生的巨大影响而广泛应用于各个领域,成为当今材料科学领域研究的热点。混凝土是应用最为广泛的传统型建筑材料,随着人类社会的不断进步和科学技术的日益发展,混凝土的应用范围越来越广,对其使用性能亦提出了更高的要求。许多学者将纳米材料掺入混凝土中,对其性能的改善得到了很好的效果。在众多的纳米材料中,纳米二氧化钛与纳米二氧化硅具备良好的性能得到广泛应用。本文主要研究纳米二氧化钛与纳米二氧化硅对水泥基复合材料宏观性能的改性方法、改性效果以及改性机理。本文主要研究内容具体包括以下方面:1.纳米粒子对水泥基材料性能的改性效果及机理:将Ti O2纳米颗粒掺入水泥中,对Ti O2纳米颗粒改性水泥基材料的水化热,水泥石的微观形貌,元素分布,强度,抗渗性能进行研究,结果表明Ti O2纳米颗粒的掺入可以促进水泥早期的水化。同时通过matlab分析软件将元素分布可视化,定量表征了纳米材料和水泥水化产物分布状态,并分析了其相关性,揭示了纳米材料对水泥净浆早期和后期性能的作用机制。2.纳米材料改性碳纤维:通过溶胶凝胶法制备纳米Si O2改性溶液并分析了时间、温度、PH值等不同影响因素对Si O2纳米粒子粒径的影响。通过热重、XRD等手段表征分析了所制备的产物。然后对碳纤维表面进行氧化并溶胶凝胶纳米Si O2表面接枝改性处理,观测了不同溶胶凝胶溶液改性碳纤维的表面形貌,分析了改性前后碳纤维的Si元素含量的变化情况及其影响因素。3.改性碳纤维水泥复合材料界面性能研究:采用单丝拔出试验,对改性纤维增强水泥基复合材料的界面性能进行测试;分析试验结果,根据界面应力传递的剪滞理论得到了纤维脱黏荷载的确定方法,对比分析改性纤维的界面增强效果和单丝拔出荷载-位移曲线的变化,结果表明改性纤维增强水泥基复合材料的界面强度得到显著提高,通过改性碳纤维拔出后界面形貌和水化产物的观测分析揭示了其强度提高机理。
[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.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB33
本文编号：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.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB33
【参考文献】
相关期刊论文 前1条
1 刘瑶;;玄武岩纤维混凝土耐久性研究及机理分析[J];山西建筑;2014年09期
，本文编号：2420753
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