玄武岩纤维增强机场道面混凝土的力学性能研究

发布时间：2018-01-18 15:08

本文关键词：玄武岩纤维增强机场道面混凝土的力学性能研究　出处：《沈阳工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：玄武岩纤维是以天然玄武岩矿石为原料制成的一种无机连续纤维，除具有抗腐蚀、耐高温、成本低等优点外，还有着优越的力学性能和天然的相容性，在各行各业中得到广泛应用，尤其作为混凝土增强领域的新型材料，在工程实际中的作用日趋明显。本文结合普通水泥混凝土机场跑道设计要求及其具备的性能，对玄武岩纤维增强混凝土在不同制备工艺条件下的抗压、抗折、劈裂抗拉等力学性能进行了试验研究。并根据纤维混凝土经典理论及SEM图片，对玄武岩纤维增强混凝土的增强、增韧机理进行分析，构建玄武岩纤维增强混凝土作为面层的机场跑道模型，利用有限元分析软件进行模拟分析，并得出结论。具体研究内容如下： 1．对玄武岩纤维增强混凝土在不同制备工艺下的抗压、抗折、抗劈拉等力学性能开展试验研究。结果显示：玄武岩纤维对于混凝土的抗压强度没有明显提高，而在抗折及抗劈拉强度上提高效果明显，，并且抗折强度及劈拉强度都随着纤维体积掺量的增加而增大。两种制备工艺对比下水泥净浆包裹纤维掺入法对混凝土的增强、增韧效果优于直接掺入法。 2．根据经典理论，从耗能角度分析玄武岩纤维混凝土的增强、增韧机理。对不同制备工艺、不同掺量条件下的试块做成扫描试样，利用扫描电子显微镜观察纤维与混凝土之间的结合情况，并对不同条件下试样的SEM照片进行比对。结果显示：预处理方法制备的混凝土内部孔隙率、纤维分散性、水化作用效果、粘结性等都要优于直掺法。 3．构建玄武岩纤维增强混凝土作为面层的机场跑道模型，并利用ABAQUS有限元分析软件对其进行受力分析，分析不同机型条件下跑道的应力及变形情况，结果表明：玄武岩纤维增强混凝土作为面层的机场跑道有着优越的力学性能，满足三种机型的使用要求。以上研究表明，作为一种具有良好力学性能的复合型工程材料，加之其优越的经济性，玄武岩纤维增强混凝土必将进一步得到广泛的工程应用。本文的研究成果为该材料的进一步的工程应用提供了有益的参考和借鉴。
[Abstract]:Basalt fiber is a kind of inorganic continuous fiber made from natural basalt ore. Besides its advantages of corrosion resistance, high temperature resistance and low cost, it also has excellent mechanical properties and natural compatibility. It has been widely used in various industries, especially as a new material in the field of concrete reinforcement, which plays an increasingly important role in engineering practice. According to the requirements of ordinary cement concrete airfield runway design and its performance, this paper studies the compressive and flexural properties of basalt fiber reinforced concrete under different preparation conditions. According to the classical theory of fiber reinforced concrete and SEM pictures, the mechanism of strengthening and toughening of basalt fiber reinforced concrete is analyzed. The model of airport runway with basalt fiber reinforced concrete as the surface layer is constructed, and the finite element analysis software is used to simulate and analyze it, and the conclusion is drawn. The specific research contents are as follows: 1. The compressive and flexural properties of basalt fiber reinforced concrete under different preparation processes. The results show that the compressive strength of basalt fiber is not obviously improved, but the effect of bending and splitting tensile strength is obvious. The flexural strength and splitting tensile strength increase with the increase of fiber volume content. The toughening effect of cement paste coated fiber blending method is better than that of direct blending method under the comparison of two kinds of preparation technology. 2. According to the classical theory, the strengthening and toughening mechanism of basalt fiber reinforced concrete is analyzed from the angle of energy dissipation. The bonding between fiber and concrete was observed by scanning electron microscope (SEM), and the SEM photos of the samples were compared under different conditions. The results showed that the internal porosity of concrete prepared by pretreatment method. Fiber dispersity, hydration effect and adhesion are better than direct mixing method. 3. The model of airport runway with basalt fiber reinforced concrete as the surface layer is constructed and analyzed by ABAQUS finite element analysis software. The stress and deformation of runway under different model conditions are analyzed. The results show that the airport runway with basalt fiber reinforced concrete as surface layer has superior mechanical properties and meets the requirements of three types of aircraft. The above research shows that as a composite engineering material with good mechanical properties and its superior economy. Basalt fiber reinforced concrete will be widely used in engineering. The research results in this paper provide a useful reference for the further engineering application of this material.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414;V351.11

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