木纤维混凝土抗压弯及吸声性能试验研究

发布时间：2018-07-07 11:48

本文选题：木纤维 + 力学性能　；参考：《湖北工业大学》2016年硕士论文

【摘要】：混凝土是土木工程中用途最广、用量最大的一种建筑材料。但由于混凝土存在抗拉强度低、耐热性低和隔音性低的缺点,在以混凝土做建筑框架的时候,需在外表涂一层隔热层和吸音板,不但增加了工程量,而且增加了墙体的厚度。本文所研究的木纤维混凝土就是用木纤维做骨料配置的混凝土。木纤维具有良好的吸声性,由木纤维掺杂进混凝土增大其孔隙率以提高混凝土的吸音性。本文通过体积法对C30混凝土的配合比进行研究,研究其7d和28d的强度,得出最优配合比,并在最优配合比下掺入不同掺量的木纤维,配制出不同木纤维含量的混凝土,对基本力学性能和吸声性能进行实验研究,分析了木纤维对C30混凝土的基本力学性能和增强吸声性效果的影响。主要研究内容如下:(1)在保持基准混凝土配合比不变的情况下,以不同木纤维体积率替代细骨料掺入混凝土,分别以木纤维气干状态和饱水状态进行基本力学性能进行研究。研究得出,随着木纤维体积率的增加,木纤维混凝土的抗压、弯曲性能均有所降低。(2)在保持基准混凝土配合比不变的情况下,以不同体积率的木纤维混凝土试块进行40d的清水浸泡试验,分析木纤维混凝土的透水性能及浸泡液的pH值。研究得出木纤维混凝土具有一定的吸收和降解碳元素的能力。(3)在保持基准混凝土配合比不变的情况下,以不同体积率的木纤维混凝土分别用200Hz、500Hz、900Hz、1200Hz和3000Hz频率的声音进行模拟声学试验,分析木纤维混凝土对交通道路噪音的改善效果。研究得出木纤维混凝土在500Hz~900Hz的频率范围内吸声效果最好。
[Abstract]:Concrete is one of the most widely used and used building materials in civil engineering. However, because the concrete has the disadvantages of low tensile strength, low heat resistance and low sound insulation, when using concrete as the building frame, it is necessary to coat a layer of insulation and sound-absorbing board on the exterior, which not only increases the amount of work, but also increases the thickness of the wall. Wood fiber concrete studied in this paper is concrete with wood fiber as aggregate. Wood fiber has good sound absorption, and the concrete is doped with wood fiber to increase its porosity to improve the sound absorption of concrete. In this paper, the mix ratio of C30 concrete was studied by volume method, the strength of C30 concrete was studied, and the optimum mix ratio was obtained. Under the optimum mix ratio, different amount of wood fiber was mixed in, and the concrete with different wood fiber content was prepared. The basic mechanical properties and sound absorption properties of C30 concrete were studied experimentally. The effects of wood fiber on the basic mechanical properties and enhanced sound absorption of C30 concrete were analyzed. The main research contents are as follows: (1) under the condition of keeping the mixture ratio of reference concrete unchanged, the basic mechanical properties of concrete were studied by using different wood fiber volume ratio instead of fine aggregate, respectively, under the condition of wood fiber air-dry state and saturated state. The results show that the compressive and flexural properties of wood fiber concrete decrease with the increase of wood fiber volume ratio. (2) under the condition of keeping the mix ratio of reference concrete unchanged, The water permeability of wood fiber concrete and the pH value of the soaking solution were analyzed by the water immersion test of wood fiber concrete samples with different volume ratios for 40 days. The results show that wood fiber concrete has the ability to absorb and degrade carbon elements. (3) under the condition of keeping the mixture ratio of reference concrete unchanged, The acoustical tests of wood fiber concrete with different volume ratios were carried out at the frequencies of 200Hz ~ 500Hz ~ 900Hz and 3000Hz, respectively, to analyze the improvement effect of wood fiber concrete on traffic road noise. The results show that wood fiber concrete has the best sound absorption in the frequency range of 500 Hz / 900 Hz.
【学位授予单位】：湖北工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU528

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