玄武岩纤维再生混凝土高温后力学性能试验研究

发布时间：2018-04-14 04:09

  本文选题：玄武岩纤维 + 再生混凝土　； 参考：《辽宁工业大学》2017年硕士论文

【摘要】：再生混凝土是一种将废弃混凝土破碎、筛分及冲洗后,部分或全部替代天然骨料重新配制而成的新型混凝土材料,实现了建筑材料资源的循环可持续利用,对促进生态协调具有重要的意义。为了满足日益增加的人口住房需求,高层、超高层、大跨度建筑应运而生,而火灾严重威胁着建筑物的安全性,一旦建筑火灾发生造成结构坍塌,将会对人民群众的生命及财产带来巨大的损失,提高结构的抗火性能成为我们关注的焦点。在再生混凝土中加入玄武岩纤维,利用纤维的耐高温、强度高及化学稳定性好等特性提高再生混凝土高温后力学性能,因此对玄武岩纤维再生混凝土高温后力学性能的研究是非常必要的。本文首先研究了C40再生混凝土在配合比不变的条件下,玄武岩纤维掺入方式、掺入体积率对高温(200℃、400℃、600℃)作用后玄武岩纤维再生混凝土的质量损失率、基本力学性能及各个力学性能之间相互关系的影响。掺入方式为水泥浆包裹纤维掺入及纤维直接掺入;掺入体积率为0.1%、0.15%、0.2%;力学性能有立方体抗压强度、劈裂抗拉强度、轴心抗压强度、静弹性模量。其次研究了纤维掺入率对25次慢速冻融及高温叠加作用后的纤维再生混凝土立方体抗压、劈拉强度及其拉压比的影响。最后给出了不同情况下各个力学性能与温度的拟合曲线公式。试验结果表明:玄武岩纤维的加入可以降低高温后再生混凝土的质量损失率;高温后玄武岩纤维再生混凝土的立方体抗压、轴心抗压强度在温度为200℃时达到峰值,弹性模量、劈拉强度随温度上升则一直呈下降趋势;玄武岩纤维对立方体抗压强度、劈拉强度的提高幅度大于轴心抗压强度、静弹性模量,掺量为0.15%时表现最为明显;水泥浆包裹纤维掺入方式优于纤维直接掺入方式;25次慢速冻融及高温叠加作用对纤维再生混凝土造成的强度损伤大于其分别作用的强度损伤之和。
[Abstract]:Recycled concrete is a new kind of concrete material, which is made up of broken, sifted and washed waste concrete, partly or completely replaced by natural aggregate, and realizes the sustainable utilization of building material resources.It is of great significance to promote ecological coordination.In order to meet the increasing housing needs of the population, high-rise, super-high-rise and long-span buildings emerged as the times require, and fire seriously threatened the safety of buildings. Once the building fire occurred, the structure collapsed.It will bring great loss to the lives and property of the people, and improve the fire resistance of the structure becomes the focus of our attention.By adding basalt fiber into recycled concrete, the mechanical properties of recycled concrete after high temperature can be improved by using the properties of high temperature resistance, high strength and good chemical stability.Therefore, it is necessary to study the mechanical properties of basalt fiber recycled concrete after high temperature.In this paper, the mass loss rate of recycled concrete of basalt fiber under the condition of constant mix ratio and volume ratio of basalt fiber is studied after the action of C40 recycled concrete at high temperature of 200 鈩，

本文编号：1747631