人工拌合橡胶混凝土在框架梁中的应用

发布时间：2018-05-10 11:57

本文选题：橡胶混凝土 + 人工拌合　；参考：《湖北工业大学》2017年硕士论文

【摘要】：目前,橡胶混凝土的研究较多地集中于材料特性的研究,主要研究橡胶颗粒的大小、掺量、表面处理、纤维的添加等对材料特性的影响。因为橡胶的掺入,虽然提高了混凝土的韧性,但却较大地降低了混凝土的抗压强度,这也是橡胶混凝土仅在路面工程中使用而未在结构工程中使用的重要原因。如何在结构工程中合理使用橡胶混凝土,从而达到使结构的承载力降低较少甚至有所增加是值得我们研究的方向。本文以最简单的结构----门型框架梁为研究对象,通过模型试验研究了橡胶混凝土的布置方式对结构承载力及变形的影响规律。试验过程中,采用人工拌合方式配制了相应混凝土并人工浇筑了相关试样,具体研究内容如下:(1)以20%的橡胶掺量等体积替代砂骨料,按C25混凝土的标准配制了素混凝土和20%橡胶颗粒掺量的橡胶混凝土,制作150mm*150mm*150mm的标准立方体试块。通过压缩试验和劈拉试验,测得其抗压强度和劈拉强度。测试结果表明,人工拌合条件下,素混凝土及橡胶混凝土的抗压强度均低于标准值;且橡胶混凝土试样下降更多;但橡胶混凝土的劈拉强度远高于素混凝土,拉压比也远高于素混凝土;橡胶混凝土仍具有良好的韧性;(2)制作门型框架梁,长度1m,宽度1m,立柱及横梁的横截面尺寸均为150mm*150mm。在梁柱交接部位使用韧性较好的橡胶混凝土替代素混凝土。试验共分两组,一组不配钢筋,另一组配筋。每组进行5个试样的对比试验:全素混凝土、150mm橡胶混凝土、300mm橡胶混凝土、450mm橡胶混凝土、全橡胶混凝土,其中中间三个试样的150mm、300mm、450mm表示橡胶混凝土在角部使用的长度。(3)使用反力架对门型框架梁进行破坏试验,载荷增量0.1吨或0.2吨,记录跨中应变、跨中位移、立柱应变以及各结构的极限承载力;(4)对五个无筋框架梁的实验数据分析可知,橡胶混凝土的合理使用,可以不降低甚至小幅提高框架结构的承载力。(5)对五个有筋框架梁的实验数据分析可知,橡胶混凝土的合理使用,可以小幅提高框架结构的承载力,且上升的幅度是大于无筋混凝土框架梁的。
[Abstract]:At present, the study of rubber concrete is mainly focused on the study of material properties, mainly on the size of rubber particles, the amount of rubber, surface treatment, fiber addition and other effects on the material properties. Because of rubber mixing, the toughness of concrete is improved, but the compressive strength of concrete is greatly reduced. This is also an important reason that rubber concrete is only used in pavement engineering but not in structural engineering. How to reasonably use rubber concrete in structural engineering, so that the bearing capacity of the structure can be reduced or even increased is worthy of our study. In this paper, taking the simplest structure-door frame beam as the research object, the influence of the rubber concrete layout on the bearing capacity and deformation of the structure is studied through model tests. In the course of the experiment, the corresponding concrete was prepared by artificial mixing method and the relevant samples were poured manually. The specific research contents are as follows: (1) replacing sand aggregate with 20% rubber content equal volume. According to the standard of C25 concrete, the plain concrete and the rubber concrete with 20% rubber particles were prepared, and the standard cube test blocks of 150mm*150mm*150mm were made. The compressive strength and splitting tensile strength were measured by compression test and splitting tensile test. The test results show that the compressive strength of plain concrete and rubber concrete is lower than the standard value under the condition of artificial mixing, and the sample of rubber concrete decreases more, but the splitting tensile strength of rubber concrete is much higher than that of plain concrete. The ratio of tension to compression is also much higher than that of plain concrete, and the rubber concrete still has good toughness. (2) the portal frame beam is made with a length of 1m and a width of 1m.The cross section sizes of columns and beams are both 150mm and 150mm. The rubber concrete substitute for plain concrete with good toughness is used in Liang Zhu junction. The experiment was divided into two groups, one group without reinforcement, the other group with reinforcement. The comparative tests of five samples were carried out in each group: total plain concrete (150mm) rubber concrete (300mm) rubber concrete (300mm) rubber concrete (450mm), whole rubber concrete (RCC), The 150mm / 300mm / 450mm of the intermediate three specimens indicates that the length of rubber concrete used in the corner.) using the counterforce frame to carry out the failure test of the portal frame beam, the load increment is 0.1 ton or 0.2 ton, the mid-span strain and the mid-span displacement are recorded, The analysis of the experimental data of the five frame beams without reinforcement shows that the rational use of rubber concrete can be obtained from the analysis of the column strain and the ultimate bearing capacity of each structure. The analysis of the experimental data of five reinforced frame beams shows that the reasonable use of rubber concrete can increase the bearing capacity of frame structure slightly. And the rising range is larger than that of unreinforced concrete frame beam.
【学位授予单位】：湖北工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU528

【相似文献】