纤维於泥制陶粒混凝土基本力学性能研究

发布时间：2018-04-02 15:22

本文选题：纤维淤泥制陶粒混凝土　切入点：纤维掺量　出处：《西安建筑科技大学》2015年硕士论文

【摘要】：纤维淤泥制陶粒混凝土是指以淤泥制陶粒骨料混凝土为基体材料并在其中掺入纤维而制成的新型纤维增强生态材料。本文在课题组前期研究的基础上,旨在为课题组提出的生态复合墙体提供一种墙体材料,既解决了当下城市下水道及湖泊淤泥处理的难题,同时又满足了课题组对生态绿色材料的需求。本文通过正交试验,探讨了水灰比、骨料取代率、纤维掺量三个因素对聚丙烯纤维淤泥制陶粒混凝土和钢纤维淤泥制陶粒混凝土的立方体抗压强度和立方体劈裂抗拉强度的影响,得到了最佳配合比;研究了纤维掺量变化对聚丙烯纤维淤泥制陶粒混凝土和钢纤维淤泥制陶粒混凝土的应力-应变关系和韧度指数的影响;应用MATLAB编写了随机投骨料模型,并将模型导入ABAQUS进行非线性有限元分析。主要内容包括:(1)采用正交试验,研究了水灰比、骨料取代率、纤维掺量变化对聚丙烯淤泥制陶粒混凝土和钢纤维淤泥制陶粒混凝土立方抗压强度和劈裂抗拉强度的影响,得到了最佳配合比。试验研究与分析表明:骨料取代率、水灰比、纤维掺量对聚丙烯纤维淤泥制陶粒混凝土立方抗压强度的影响依次减小;骨料取代率和水灰比对聚丙烯纤维淤泥制陶粒混凝土立方体劈裂抗拉强度的影响大致相当,纤维掺量的影响较小;骨料取代率、纤维掺量、水灰比对钢纤维淤泥制陶粒混凝土立方抗压强度的影响依次减小;钢纤维掺量对钢纤维淤泥制陶粒混凝土的立方体劈裂抗拉强度的影响较大,而水灰比和骨料取代率的影响为次要因素。(2)采用单因素试验的方法对聚丙烯纤维淤泥制陶粒混凝土和钢纤维淤泥制陶粒混凝土进行棱柱体单轴受压试验研究,得出不同纤维掺量淤泥制陶粒混凝土单轴受压应力-应变全曲线,分析了韧度指数的影响规律,并基于试验结果,提出了符合纤维淤泥制陶粒混凝土的单轴受压本构模型。试验结果及分析表明:纤维能有效的抑制裂缝的发展,提高混凝土的变形能力,改善了混凝土的延性,有效抑制混凝土损伤的发展;在一定范围内聚丙烯纤维掺量增加时,淤泥制陶粒混凝土韧度指数随之增加。在钢纤维掺量为1.5%时,淤泥制陶粒混凝土韧度指数达到峰值。(3)从细观力学模型出发,将其视为由骨料、砂浆及骨料砂浆间的界面三者组成的复合材料,采用MATLAB软件基于蒙特卡罗方法产生了随机数,编写了随机投骨料程序,实现了二维和三维随机骨料模型的可视化,并将MATLAB的计算结果导入有限元计算软件ABAQUS中,进行了非线性有限元分析。数值计算结果表明,钢纤维淤泥制陶粒混凝土应力-应变曲线与试验结果吻合较好,其误差在允许的范围内,可应用于实际工程中。同时验证了该方法的可靠性,为纤维混凝土的数值模拟提供了有效手段。
[Abstract]:Fiber mud ceramsite concrete refers to silt ceramsite aggregate concrete as the base material and the fiber model in which the incorporation of fiber and made to enhance the ecological materials. Based on our previous study, aimed at the ecological composite wall is proposed for the group to provide a wall material, not only solve the difficult problem of the current city sewer and lake sludge treatment, and meets the demand of green ecological materials research group. Through orthogonal test, discusses the water cement ratio, aggregate replacement ratio, fiber content of three factors on the polypropylene fiber mud ceramsite concrete and steel fiber for silt ceramsite concrete cube compressive strength and splitting tensile strength are studied. The optimal mix ratio; change of the fiber content of polypropylene fiber mud ceramsite concrete and steel fiber concrete shall silt ceramsite Influence of stress - strain and toughness index compiled by MATLAB; random aggregate model, and the model is introduced into ABAQUS nonlinear finite element analysis. The main contents include: (1) orthogonal test, the effects of water cement ratio, aggregate replacement rate, the change of fiber content on poly propylene mud ceramsite concrete and steel fiber mud ceramsite concrete cubic compressive strength and splitting tensile strength of the impact, the optimal mix ratio. Experimental research and analysis show that the aggregate replacement ratio, water cement ratio, effect of fiber content of concrete cubic compressive strength of polypropylene fiber mud ceramsite were reduced; influence of aggregate replacement ratio and water cement ratio polypropylene fiber mud ceramsite concrete splitting strength are less affected the content of fiber; aggregate replacement ratio, fiber content, water cement ratio, steel fiber concrete sludge ceramsite Effect of cubic compressive strength decreases gradually; the cube of steel fiber concrete mud ceramsite has greater impact on splitting tensile strength, and the water cement ratio and aggregate replacement rate effects are the secondary factors. (2) using the method of single factor test of polypropylene fiber mud ceramsite concrete and steel fiber silt ceramsite concrete under uniaxial compression test of prism, different fiber content of silt ceramsite concrete uniaxial compressive stress-strain curve, analyzed the influence of toughness index, and based on the test results, put forward in line with uniaxial compression fiber slit ceramsite concrete constitutive model. The results of test and analysis show that the development of fiber can effectively inhibit the cracks, improve the deformation capacity of concrete, improve the ductility of the concrete, effectively inhibit the development of damage of concrete; polypropylene in a certain range The fiber volume fraction increases, the silt ceramsite concrete toughness index increases. The steel fiber content is 1.5%, the silt ceramsite concrete toughness index reached the peak. (3) from the micromechanics model of the composite material as aggregate, mortar and aggregate mortar interface between the three components, based on the Monte Carlo method for generating a random number by using the MATLAB software, write the random aggregate program, realize the visualization of two-dimensional and three-dimensional random aggregate model, and the calculation results of MATLAB finite element calculation software ABAQUS, the non linear finite element analysis. The numerical results show that the steel fiber mud ceramsite concrete stress - strain curves are in good agreement with experimental results, the error is in the allowable range, can be used in practical engineering. At the same time to verify the reliability of the method, simulation for fiber concrete number value Effective means.

【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU528.2

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