软纤维增强水泥混凝土力学物理性能研究

发布时间：2018-04-23 18:57

本文选题：水泥混凝土 + 使用性能　；参考：《哈尔滨工业大学》2013年硕士论文

【摘要】：水泥混凝土因其抗压强度高、成本低等优点在各个行业得到了广泛的应用。随着科学技术发展和进步，对道路提出了更高的要求。作为路面材料水泥混凝土也面临着新的挑战。因为水泥混凝土是刚性材料，在温度和应力作用下会产生很多裂纹。裂纹的存在降低了水泥混凝土使用性能，缩短其使用寿命。有效解决这个问题的手段之一，就是在水泥混凝土中掺入高弹性模量的纤维。玻璃纤维和聚丙烯纤维是未来水泥混凝土使用最有效的纤维。但是由于玻璃纤维掺入后会受到腐蚀。因此本文对玻璃纤维腐蚀行为，配合比设计，混凝土制备工艺，最佳的纤维掺入量作了相应的研究。并通过力学性能和耐久性能来比较两种混凝土优劣。在文中首先采用碱性溶液来模仿耐碱玻璃纤维在水泥混凝土中腐蚀行为。采用失重法来研究纤维腐蚀状况，初步研究了其腐蚀机制。针对腐蚀机制，采用掺入活性掺料粉煤灰、硅灰的办法降低水泥砂浆的碱度，保护玻璃纤维不被腐蚀，取得了较为理想的结果。然后，在混凝土配合比设计的基础上，确定了最佳的制备工艺。结果表明，先掺法可以使纤维均匀分散在混凝土中，提高了水泥混凝土各项性能指标。同时确定了最佳的耐碱玻璃纤维和改性聚丙烯纤维的掺入量，分别为1.0kg/m3、0.9kg/m3。最后针对两种掺入纤维的混凝土进行了力学性能、耐久性能对比。二者对于混凝土的力学性能均有所提高，其中耐碱玻璃纤维提高程度较改性聚丙烯纤维好。耐久性方面，二者均比普通混凝土优异，其中耐碱玻璃纤维混凝土略差于改性聚丙烯纤维混凝土。研究表明：玻璃纤维和改性聚丙烯纤维混凝土都可以推广使用，特别是对于抗冻性要求比较高的寒区建筑、交通行业。
[Abstract]:Cement concrete has been widely used in various industries because of its high compressive strength and low cost. With the development and progress of science and technology, the road has put forward higher requirements. As a pavement material, cement concrete is also facing new challenges. Because cement concrete is a rigid material, it can produce many cracks under the action of temperature and stress. The existence of cracks reduces the performance of cement concrete and shortens its service life. One of the effective ways to solve this problem is to mix high elastic modulus fibers into cement concrete. Glass fiber and polypropylene fiber are the most effective fibers for cement concrete in the future. However, due to glass fiber adulteration will be corroded. Therefore, the corrosion behavior of glass fiber, the mix ratio design, the preparation process of concrete and the optimum fiber content are studied in this paper. And through the mechanical properties and durability to compare the advantages and disadvantages of the two kinds of concrete. In this paper, alkaline solution is first used to simulate the corrosion behavior of alkali resistant glass fiber in cement concrete. The corrosion mechanism of fiber was studied by weightlessness method. According to the corrosion mechanism, the alkalinity of cement mortar is reduced by adding active fly ash and silica fume, and the glass fiber is protected from corrosion. Then, on the basis of concrete mix ratio design, the best preparation technology is determined. The results show that the fiber can be dispersed uniformly in concrete and the performance index of cement concrete can be improved. The optimum ratio of alkali resistant glass fiber and modified polypropylene fiber is 1.0 kg / m ~ (3) ~ 0.9kg 路m ~ (3) respectively. Finally, the mechanical properties and durability of two kinds of concrete mixed with fiber are compared. Both of them improve the mechanical properties of concrete, and the alkali-resistant glass fiber is better than the modified polypropylene fiber. In terms of durability, both of them are superior to ordinary concrete, and alkali-resistant fiberglass concrete is a little worse than modified polypropylene fiber concrete. The results show that both glass fiber and modified polypropylene fiber concrete can be widely used, especially for the construction and transportation industry in cold regions where the frost resistance is very high.
【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】：2013
【分类号】：TU528

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