橡胶微粒混凝土韧性研究

发布时间：2018-03-20 11:57

本文选题：橡胶微粒混凝土　切入点：等抗压强度　出处：《天津大学》2014年硕士论文　论文类型：学位论文

【摘要】：我国从“十二五”规划以来,一直将绿色发展作为主题,也对土木建筑行业,提出了相关的要求,要求其加大力度研制开发绿色环保型的新型建筑材料及其制品。我国于2006年施行的关于绿色建筑评价标准中明确指出,绿色建筑是指在整个建筑的服役过程中,能够最大限度地利用可循环再生材料,保护环境和节约资源,并且能够尽最大可能减少对环境的污染。如今,废旧轮胎橡胶已经造成了十分恶劣的“黑色污染”,橡胶微粒混凝土的出现能够将废弃的橡胶资源化,不仅很好地解决了大量废弃橡胶污染环境的问题,还为建筑工程领域提供了一种新型环保绿色材料。自1960年至今,橡胶微粒混凝土广受国内外学者的关注与研究,并在其有关工作性能、力学性能、变形性能、耐久性能、抗疲劳性能、隔音和隔热性能以及本构关系等方面取得了很多宝贵的科研成果。但现有橡胶微粒混凝土单轴受压韧性的研究都是从试件的破坏模式和拉压比等方面间接地说明掺入橡胶后混凝土韧性的变化,或者只考虑应力—应变全曲线上升段而没有考虑下降段,定性分析得到橡胶微粒掺量对混凝土有关韧性性能的影响,并且有关等抗压强度条件下橡胶微粒混凝土韧性方面的研究较少。本文以橡胶微粒混凝土立方体抗压强度为30MPa和40MPa为切入点,研究了橡胶微粒不同体积掺量(0、10%和15%)对等抗压强度橡胶微粒混凝土的力学性能及其韧性和变形的影响,首次定量分析得到混凝土韧性性能与橡胶掺入量的关系,丰富了橡胶微粒混凝土的相关研究内容,也为工程实践提供了科学依据。本文首先介绍了橡胶微粒混凝土国内外的研究进展及其应用现状,接着提出了一种测定橡胶微粒混凝土单轴受压棱柱体应力—应变全曲线的装置,并用ANSYS大型通用分析软件分析了该装置的适用性,然后根据本文的研究内容确定本试验所用材料、试验设备与仪器、试验配合比及试验方法。试验研究发现:可用采用YNS-Y3000电液伺服压力试验机(带有配套光栅),并选用位移控制加载方式,测定橡胶微粒混凝土单轴受压应力—应变全曲线,并根据所测定的全曲线以及参照美国ASTM标准计算评定橡胶微粒混凝土的韧性。韧性的计算结果表明,混凝土中掺入橡胶后较未掺橡胶前其单轴受压破坏表现出比较明显的韧性破坏特征,其韧性指数有较大幅度的提高,并且在一定范围内,橡胶微粒掺量越多对混凝土的增韧效果越好。
[Abstract]:Since the 12th Five-Year Plan, green development has been taken as the theme in our country, and the civil construction industry has been required to do so. It is required to make greater efforts to develop new building materials and products that are green and environmentally friendly. In the evaluation standard on green buildings, which was implemented in 2006 in China, it is clearly pointed out that green buildings refer to the whole service process of the buildings. To maximize the use of recyclable materials, to protect the environment and conserve resources, and to minimize pollution to the environment as far as possible. The waste tire rubber has already caused very bad "black pollution". The appearance of rubber particulate concrete can recycle the waste rubber, which not only solves the problem of environmental pollution caused by a large number of waste rubber. From 1960 to now, rubber particulate concrete has been paid much attention to and studied by domestic and foreign scholars, and it has been applied to work performance, mechanical property, deformation property and durability. Fatigue resistance, Many valuable scientific achievements have been made in the aspects of sound insulation and thermal insulation, as well as constitutive relations. However, the existing research on the uniaxial compressive toughness of rubber particulate concrete is explained indirectly from the failure mode of the specimen and the ratio between tensile and compression. The change of toughness of concrete after adding rubber, Or considering only the rise of the stress-strain curve and not the descending section, the effect of rubber particle content on the toughness properties of concrete is obtained by qualitative analysis. And there is little research on the toughness of rubber particle concrete under the condition of equal compressive strength. In this paper, the cube compressive strength of rubber particle concrete is 30 MPA and 40 MPA as the starting point. The mechanical properties and the effects of toughness and deformation of rubber particle concrete with equal compressive strength (10% and 15%) were studied. The relationship between the toughness of concrete and the content of rubber was obtained by quantitative analysis for the first time. It enriches the research contents of rubber particulate concrete and provides scientific basis for engineering practice. Firstly, this paper introduces the research progress and application status of rubber particulate concrete at home and abroad. Then a device for measuring the stress-strain curve of rubber particulate concrete under uniaxial compression is proposed. The applicability of the device is analyzed with ANSYS software. Then, according to the research content of this paper, the materials, test equipment and instruments used in this experiment are determined. Test mix ratio and test method. The test results show that YNS-Y3000 electro-hydraulic servo pressure testing machine (with matching grating and displacement control loading method) can be used to measure the full stress-strain curve of rubber particulate concrete under uniaxial compression. The toughness of rubber particulate concrete is evaluated according to the total curve measured and the calculation of the rubber particle concrete with reference to the ASTM standard of the United States. The calculated results of toughness show that, The uniaxial compressive failure of concrete under uniaxial compression is more obvious than that before adding rubber, and its toughness index has been greatly improved, and in a certain range, The more rubber particles are added, the better the toughening effect of concrete is.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU528

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