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The composite the SMA fibers toughening RPC the mechanics performance and applied research

Author: ZhaoYuKui
Tutor: ZuoXiaoBao
School: Nanjing University of Technology and Engineering
Course: Structural Engineering
Keywords: SMA fiber RPC Compression performance Flexural performance Fatigue resistance Impact toughness
CLC: TU528.572
Type: Master's thesis
Year: 2012
Downloads: 12
Quote: 0
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Abstract

With the continuous improvement of the engineering construction of concrete material performance requirements, the research and application of high-performance concrete has been rapid development. Reactive powder concrete (RPC), because of its excellent physical and mechanical properties, good durability, harmony with the ecological environment has become a hot research topic of civil engineering materials sector. Order to improve the performance of RPC flexural fatigue resistance and impact toughness, incorporation of various fibers in the RPC substrate prepared by incorporation of a composite steel fiber and SMA fiber RPC toughening material is one of the effective ways to on material prepared by the static and dynamic mechanical testing and applied research, the main research results are as follows: (1) preferred RPC constituent materials. Using multiple composite technology to play a super-additive effect of a variety of industrial waste residue (silica fume, ground slag, etc.); the preferred steel fiber and SMA wire varieties, improve the composite the SMA fibers toughening RPC the cost-effective; optimize the size of the SMA fiber, the choice of The diameter of 1mm, and a length of 13mm of the SMA chopped fiber incorporated RPC substrate. Prepared through the above channels of high-performance, cost-effective, eco-friendly composite SMA fiber toughening RPC material. (2) the RPC material prepared composite SMA fiber toughening axial compression, bending, fatigue and impact tests, analysis of the fiber fraction and the incorporation of the way the material compressive strength, flexural strength, fatigue life, impact toughness mechanical property parameters were investigated. The test results show that: with the fiber content increases to improve, have improved the performance of the material, when the total fiber volume content of 1.5%, the fatigue life of the material increased by two orders of magnitude, impact toughness increased by about 5.3-fold; contrast single steel fiber doped SMA fiber, complex steel fiber and SMA fiber three fiber incorporation way, the most effective compound mixed with steel fibers and SMA fiber. (3) design a bending member on the basis of the above material performance test, study the incorporation of two different fibers eccentric compression column in the corresponding failure modes and loads loads - strain the relationship. The test results show that: complex column compared two fibers doped single-doped fiber steel column, the maximum carrying capacity increased nearly 1/3 of the deformation capacity by nearly 10%; complex doped deformation characteristics of the two fiber eccentric compression column able to meet the requirements of engineering applications, the feasibility of engineering application.

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