钢纤维混凝土的力学性能及路面工程应用研究

【作者】 管新建；

【导师】 乐金朝； 韩菊红；

【作者基本信息】 郑州大学 ， 岩土工程， 2003， 硕士

【摘要】 钢纤维混凝土是近年来发展起来的一种新型建筑材料，是在普通混凝土中掺入适量的钢纤维而形成的可浇筑、可喷射成型的一种新型复合材料，除抗压强度外，它的各项物理力学性能都比普通混凝土有显著的改善和提高，使原属于脆性材料的混凝土变为具有一定塑性性质的复合材料，其主要工作机理是利用均匀分散的短钢纤维来改善普通混凝土的脆性。在受力过程中，短钢纤维发挥其抗拉强度高，而混凝土发挥其抗压强度高的各自优势，从而使其具有优良的抗裂、抗弯、耐疲劳、耐磨耗、韧性高等力学性能，在公路路面、机场道面及建筑结构的应用上有着广阔的前景。 本文通过对国内外当前关于钢纤维混凝土的应用及理论分析，基于钢纤维混凝土基本理论，精心选择原材料，精心设计，筛选适用于路面结构的钢纤维混凝土配合比，结合工程实践对钢纤维混凝土路面力学性能及路面应用进行了较为系统的研究。主要研究成果如下： 1．在选择了合理的配合比基础上，通过对320块试件的试验和理论分析，研究了钢纤维体积率的变化对抗压、劈拉、抗折以及弯曲韧性等力学性能的影响及变化规律，由不同分层试件的试验结果，探讨了钢纤维混凝土的分层高度对劈拉、抗折等强度影响，为钢纤维混凝土的路面结构设计提供了可靠的依据。 2．对钢纤维的类型以及在混凝土中的形态进行描述与分析，探讨了钢纤维混凝土的增强、破坏及抗裂机理。 3．根据试验结论，并依据水泥混凝土路面设计方法，得出了适合于单层式钢纤维混凝土和复合式钢纤维混凝土路面的设计理论、设计方法和步骤。 4．把此结构设计应用于工程实际，并结合试验路的铺筑，探讨了钢纤维混凝土路面的施工工艺及路用效果，以促进钢纤维混凝土的推广应用。 5．本文所提出的路面结构避免了沥青路面和普通混凝土路面易出现的缺点和不足。论文利用静态和动态的分析方法，对沥青路面、普通水泥混凝土路面、钢纤维混凝土路面以及钢纤维与普通混凝土复合路面进行经济分析比较，得出了复合式路面比其它几种路面更为经济、合理的结论。如采用本路面结构可节省原材料，节约资金，提前工期和延长路面寿命。更多还原

【Abstract】 The Steel fiber-reinforced concrete is a kind of new structural material and is a kind of new compound material that is formed by adding the proper amount of steel fibers into ordinary concrete recently. It can be poured and can be ejected to form some shapes. It has better physical mechanics properties than ordinary concrete except crushing resistance . It can make ordinary concrete that is a kind of brittle material be changed to a kind of compound material that has better plasticity. Its main working mechanism is to improve the brittleness of ordinary concrete by using short fibers that are scattered equably. Because short fibers have higher dragging resistance and ordinary concrete has higher crushing strength in the process of stressing, every technical property of fiber-reinforced concrete is improved greatly. Accordingly fiber-reinforced concrete has better stressing properties such as crack resistance , bending resistance , anti-fatigue, anti-friction and high toughness. So it has brilliant future in highway surface, road surface of aerodrome and architectural construction.At first the application and theory of fiber- reinforced concrete at home and at abroad is analyzed in this paper. Then based on the basic theories of fiber-reinforce concrete. Original materials are selected carefully and mix proportion of fiber-reinforced concrete which is suitable for road construction is designed and filtered carefully. Mechanical properties and pavement application of The Steel fiber-reinforced concrete is studied in details by combining engineering practice. The main research outputs of this paper are as follows:l.Baed on the choosing rational mix proportion, the influence of changing volume proportion of steel fiber on mechanical properties such as crushing resistance, splitting resistance, breaking resistance and bending resistance and the variation rule of mechanical properties are studied by experiment and theoretical analysis of 320 samples. According to experimental results of different layered structure of fiber-reinforced concrete, the influence of layered height on splitting strength and breaking strength is discussed. So it offers reliable reference to design road structure by using fiber-reinforced concrete.2.The type of steel fiber and the form of it in concrete are described and analyzed and the mechanism of fiber-reinforced concrete such as reinforcement, damage and cracking resistance is discussed.3. According to the experimental results and the method to design road surface by using cement concrete, design theory , design method and design procedure fittingfor single-skin and compound fiber-reinforced concrete road are brought forward.4. This structural design is applied to real engineering. The construction technology and working results of fiber-reinforced concrete road are discussed by laying test road in order to promote the application of fiber-reinforced concrete.5. Pavement structure that is put forward in this paper turn away these disadvantages that the asphaltum road and ordinary concrete road easily come forth often. By adopting static and dynamic analysis methods, economic and technical evaluations of common concrete road, fiber-reinforced concrete and compound road by combining steel fibers with common concrete are put forward .This conclusion is drawed that compound road by combining steel fibers with common concrete are put forward is better than other roads. Material and fund can be saved and road longevity can be prolonged if this road structure is adopted.更多还原