玄武岩纤维对混凝土抗冲击性能的影响

发布时间：2018-01-13 21:20

本文关键词：玄武岩纤维对混凝土抗冲击性能的影响　出处：《天津大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着建筑技术的发展和实际工程的需要,建筑结构更多的向复杂的工作环境中延伸,如抗爆结构、抗震地区建筑的基础、高铁的路基轨枕等,这样的环境对建筑材料提出了动力性能上的要求。但是国内目前在冲击试验上并无标准规范,同时,关于玄武岩纤维混凝土的冲击次数满足何种规律也并无相关研究。试验采用两种长度(6mm、18mm)、直径15μm的玄武岩纤维,制成不同掺量(体积分数0,0.4%,0.6%,0.8%)的玄武岩纤维混凝土,采用U型试件及自制的落锤冲击装置测量混凝土的冲击次数,研究玄武岩纤维掺量及长度的变化对混凝土抗压强度、抗折强度及抗冲击性能的影响,并探究玄武岩纤维混凝土的冲击次数满足何种数学模型。试验结果表明,掺加玄武岩纤维对混凝土抗压强度、抗折强度、抗冲击性能都有不同程度的提高,以抗冲击性能的提高尤为明显,并且,随着纤维掺量的增加,强度也逐渐增加;另外,长度为6mm的纤维相对于长度18mm的纤维对混凝土强度的增加效果更加明显,同时发现,玄武岩纤维混凝土的冲击次数很好的符合双参数的威布尔分布,即双参数的威布尔分布可以描述玄武岩纤维混凝土的冲击次数。本次试验可以为国内冲击试验的规范提供试验基础,同时,由于玄武岩纤维的经济性,玄武岩纤维混凝土可以广泛应用于实际工程来提升结构的抗冲击性能,另外,将混凝土的冲击次数与数学模型结合起来,可以为以后的混凝土研究提供数学基础。
[Abstract]:With the development of building technology and the need of practical engineering, the structure of the building extends to the complex working environment, such as the anti-explosion structure, the foundation of the earthquake resistant area, the high-speed railway subgrade sleeper and so on. This environment has put forward the dynamic performance requirements for building materials. However, there is no standard standard in impact test in China, and at the same time. There is no related study on the regularity of the impact times of basalt fiber concrete. Two kinds of basalt fibers of 6 mm ~ 18 mm in length and 15 渭 m in diameter are used in the experiment. Basalt fiber concrete with different content (volume fraction 0 ~ 0. 4 and 0. 6 ~ 0. 8) is made. The impact times of concrete are measured by using U-shaped specimen and a drop hammer impact device made by ourselves. The influence of the content and length of basalt fiber on the compressive strength, flexural strength and impact resistance of concrete is studied, and the mathematical model of the impact times of basalt fiber reinforced concrete is discussed. With the addition of basalt fiber, the compressive strength, flexural strength and impact resistance of concrete are improved to some extent, especially the impact resistance, and with the increase of fiber content. The strength also increases gradually; In addition, the increase of concrete strength of the fiber with length of 6 mm is more obvious than that of the fiber of 18 mm in length. At the same time, it is found. The impact times of basalt fiber concrete are in good agreement with the Weibull distribution with two parameters. That is, the Weibull distribution with two parameters can describe the impact times of basalt fiber concrete. This test can provide the test basis for the domestic impact test specification, at the same time, because of the economic efficiency of basalt fiber. Basalt fiber reinforced concrete can be widely used in practical engineering to improve the impact performance of the structure. In addition, the impact times of concrete are combined with the mathematical model. It can provide mathematical basis for future concrete research.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU528

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