橡胶粒玄武岩纤维混凝土抗压与抗冻性能及其微观孔隙特征的研究

发布时间：2018-03-11 07:11

本文选题：混凝土　切入点：橡胶粒　出处：《内蒙古农业大学》2017年硕士论文　论文类型：学位论文

【摘要】：将废旧橡胶回收后加工成颗粒状体后再次利用,是环保利用废旧橡胶的热门方式,如橡胶混凝土,较普通混凝土具有质量轻、较优的耐久、耐磨、抗冲击性能,但橡胶粒掺入混凝土后会一定程度上削弱混凝土的力学性能,而玄武岩纤维与混凝土具有天然的相容性,耐高温、且抗拉、阻裂性能优异,因此考虑在橡胶混凝土中掺入玄武岩纤维来提高混凝土的力学性能。本论文采用外掺方式,在混凝土中混掺不同掺量的橡胶粒和短切玄武岩纤维,试验研究橡胶粒玄武岩纤维混凝土的抗压强度、抗冻性能和微观孔隙特征,并探究了微观孔隙特征对宏观抗压强度、抗冻性能的影响。本文主要研究成果如下:(1)橡胶粒掺入混凝土会降低混凝土的抗压强度,且掺量越大,强度降低越明显,橡胶混凝土的抗压强度随着玄武岩纤维掺量的增加而先增大后减小,当玄武岩纤维掺量为2.0kg/m3时,混凝土抗压强度提高明显。(2)结合理论计算和试验数据,得出橡胶粒玄武岩纤维混凝土复合刚度确定公式和损伤本构方程。(3)建立了橡胶粒玄武岩纤维混凝土拟合回归方程,并引入了抗冻因子ω来评价橡胶粒、玄武岩纤维掺量变化对抗冻性能的影响。(4)根据分形理论和灰色系统理论,结合橡胶粒玄武岩纤维混凝土的微观孔隙特征,得到了混凝土的分形维数,并评价了微观孔隙特征对宏观抗压强度、抗冻性能的影响。
[Abstract]:It is a popular way for environmental protection to use waste rubber, such as rubber concrete, which is lighter in weight, better in durability, wear resistance and impact resistance than ordinary concrete. However, the mechanical properties of concrete will be weakened to some extent by adding rubber particles into concrete, while basalt fiber and concrete have natural compatibility, high temperature resistance, excellent tensile resistance and crack resistance. Therefore, to improve the mechanical properties of concrete by adding basalt fibers into rubber concrete, this paper uses the method of mixing different amount of rubber particles and short cut basalt fibers in concrete. The compressive strength, freezing resistance and micropore characteristics of rubber basalt fiber reinforced concrete were studied, and the effect of micro pore characteristics on macroscopic compressive strength was investigated. The main research results of this paper are as follows: (1) the addition of rubber particles into concrete will reduce the compressive strength of concrete, and the greater the content, the more obvious the decrease in strength. The compressive strength of rubber concrete increases first and then decreases with the increase of basalt fiber content. When the content of basalt fiber is 2.0 kg / m ~ 3, the compressive strength of concrete increases obviously. The compound stiffness formula and damage constitutive equation of rubber basalt fiber concrete are obtained. The regression equation of rubber particle basalt fiber reinforced concrete is established, and the antifreeze factor 蠅 is introduced to evaluate the rubber particle. According to fractal theory and grey system theory, the fractal dimension of concrete is obtained according to the microscopic pore characteristics of rubber basalt fiber concrete. The influence of micropore characteristics on macroscopic compressive strength and freezing resistance was also evaluated.
【学位授予单位】：内蒙古农业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU528

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