杜拉纤维天然轻骨料混凝土梁受弯性能试验研究

发布时间：2018-05-07 00:03

本文选题：轻骨料混凝土 + 天然浮石　；参考：《内蒙古农业大学》2015年硕士论文

【摘要】：浮石混凝土是由水泥砂浆和浮石配制而成的一种轻骨料混凝土,具有孔隙率大、低密度,抗冻、保温性能好等特点。但由于其抗拉、抗剪强度与极限拉伸应力偏低,脆性问题使浮石混凝士的优越性得不到充分的发挥,所以在一定程度上影响了它的广泛应用。杜拉纤维具有高抗拉强度、抗老化、耐化学腐蚀等多重优点。其在混凝土中的掺入可以有效提高混凝土抗折、抗渗、抗裂、抗冲击等性能。通过结合浮石混凝士与杜拉纤维二者的优点,使混凝土具有质轻、抗裂、耐久性好等特点。目前对于纤维轻骨料混凝土力学性能的研究已经相当充分,而对杜拉纤维轻骨料浮石混凝土力学性能的研究还尚不多见。本文以内蒙古地区的天然浮石为粗骨料配制了强度等级为LC40的天然浮石轻骨料混凝土。针对不同掺量的杜拉纤维,研究了杜拉纤维轻骨料浮石混凝土的基本力学性能和试验梁受弯性能。基本力学性能试验研究探讨了掺入杜拉纤维对浮石混凝土立方体抗压强度、轴心抗压强度、劈裂抗拉强度、抗折强度的影响,分析了杜拉纤维掺量变化对浮石混凝土力学性能的影响规律,得出了杜拉纤维在浮石混凝土中的适宜掺量。通过对轻骨料浮石混凝土梁、杜拉纤维轻骨料浮石混凝土梁受弯性能的试验,研究了轻骨料浮石混凝土梁与不同掺量杜拉纤维轻骨料浮石混凝土梁的破坏形态、正截面承载力、挠度变化等力学性能。在轻骨料浮石混凝土梁中掺入杜拉纤维能够有效提高其承载力,改善其变形及开裂性能。本文通过试验分析,取得了较为满意的结果,为杜拉纤维轻骨料浮石混凝土在工程实际中的应用提供了试验依据。
[Abstract]:Pumice concrete is a kind of lightweight aggregate concrete made from cement mortar and pumice. It has the characteristics of large porosity, low density, frost resistance and good thermal insulation. But because of its tensile strength, the shear strength and ultimate tensile stress are low, the brittleness problem makes the superiority of the pumice coagulant not fully played, so it is affected to a certain extent. Dulla fiber has many advantages, such as high tensile strength, anti aging, chemical corrosion resistance and so on. Its incorporation in concrete can effectively improve the flexural, seepage resistance, crack resistance and impact resistance of concrete. By combining the advantages of two groups of pumice concrete and Dura fiber, the concrete has the characteristics of light quality, crack resistance, good durability and so on. At present, the research on the mechanical properties of fiber lightweight aggregate concrete is quite sufficient, but the study on the mechanical properties of dulla fiber lightweight aggregate concrete is still not much. In this paper, a natural pumice lightweight aggregate concrete with a strength grade of LC40 is prepared by using natural pumice in Inner Mongolia area as coarse aggregate. The basic mechanical properties of dulla fiber lightweight aggregate concrete and the flexural performance of the test beam are studied. The experimental study on the basic mechanical properties of dulla fiber on the compressive strength of the pumice concrete cube, the axial compression strength, the splitting tensile strength and the flexural strength, and the analysis of the variation of dulla fiber content to the pumice. The suitable amount of dulla fiber in pumice concrete is obtained. Through the test on the flexural performance of light aggregate pumice concrete beam and dulla fiber lightweight aggregate concrete beam, the damage form of light aggregate pumice concrete beam and Dula fiber lightweight aggregate concrete beam is studied. The load-bearing capacity of the lightweight aggregate concrete beam can be improved effectively and its deformation and cracking performance can be improved by adding dulla fiber in the light aggregate pumice concrete beam. This paper has obtained satisfactory results through test and analysis, which provides a test for the application of dulla fiber lightweight aggregate concrete in engineering practice. Basis.

【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】：2015
【分类号】：TU528

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