废旧建筑结构材料的再利用研究

发布时间：2018-06-13 10:48

本文选题：再生混凝土 + 再生粗骨料　；参考：《西安科技大学》2015年硕士论文

【摘要】：随着我国建筑业的腾飞,大量建筑的改、扩建活动也迅猛发展,由此产生的建筑垃圾,造成了环境的污染、生态的破坏、资源的浪费。因此将废旧建筑材料重新加以循环利用,可缓解资源与环境压力,也符合绿色建筑的节材要求,具有重大研究意义,是未来绿色建筑发展的必然趋势。本文以废旧建筑材料为研究对象,对其再生骨料的循环利用进行了深入的探讨和研究。通过实验测定再生骨料的表观密度、吸水率、压碎指标等各项物理力学性能指标,并与天然骨料进行对比分析,结果表明,再生骨料的各项指标均能满足混凝土粗骨料配置要求。为了分析再生骨料掺入量对混凝土强度的影响,本文选取了三种不同强度的混凝土,对其掺入不同比例的再生骨料进行立方体抗压、劈裂抗拉、抗折强度试验研究,试验结果显示:随着再生骨料取代率的增加,混凝土的立方体抗压强度整体呈下降趋势;劈裂抗拉强度整体呈上升趋势;抗折强度变化较小。为进一步研究再生混凝土的变形性能,本文研究设计了应力-应变曲线试验方案,分析试验结果得到:随着再生骨料取代率的增加,其峰值应力和峰值应变减小,弹性模量降低。为了进一步改善再生混凝土的力学性能,本文选取在工程实际中广泛应用的C30混凝土为研究对象,对其掺入不同体积率的剪切型钢纤维进行立方体抗压、劈裂抗拉、抗折强度以及应力—应变曲线试验研究,研究证明:其土立方体抗压、劈裂抗拉、抗折强度均随钢纤维掺入量的增加而提高;应力-应变曲线试验显示随着钢纤维掺入量的增加,其峰值应力和峰值应变增大,弹性模量提高。综上所述:废旧建筑材料可以再次循环利用,且对各种再生骨料掺量的混凝土降低一个标号等级后能够满足强度、变形要求,而对再生混凝土掺入钢纤维后其强度、变形性均能得到显著提高,能够达到强度、变形要求,可以在工程中推广应用。
[Abstract]:With the rapid development of our country's construction industry, a large number of buildings have been changed, and the expansion activities have also developed rapidly. The resulting construction waste has caused environmental pollution, ecological destruction and waste of resources. Therefore, recycling waste building materials can relieve the pressure of resources and environment, and meet the requirements of green building. It is of great significance to research and is the inevitable trend of the development of green buildings in the future. In this paper, the recycling utilization of recycled aggregate is discussed and studied with waste building materials as the research object. The physical and mechanical properties of recycled aggregate, such as apparent density, water absorption rate, crushing index and so on, were measured by experiments and compared with natural aggregate. Each index of recycled aggregate can meet the requirements of coarse aggregate allocation of concrete. In order to analyze the influence of recycled aggregate on the strength of concrete, three kinds of concrete with different strength were selected, and the cubic compressive strength, split tensile strength and flexural strength of recycled aggregate were studied. The experimental results show that the cube compressive strength of concrete decreases with the increase of the replacement ratio of recycled aggregate, the overall splitting tensile strength increases and the flexural strength changes slightly. In order to further study the deformation behavior of recycled concrete, a stress-strain curve test scheme is designed. The results show that the peak stress and strain decrease with the increase of recycled aggregate replacement rate. The elastic modulus is reduced. In order to further improve the mechanical properties of recycled concrete, the C30 concrete, which is widely used in engineering practice, is studied in this paper. The experimental study on the bending strength and stress-strain curve shows that the cube compressive, splitting and tensile strength of the soil increase with the increase of steel fiber content. The stress-strain curve test shows that the peak stress and strain increase and the elastic modulus increases with the increase of steel fiber content. To sum up: waste building materials can be recycled again, and can meet the requirements of strength and deformation after reducing one grade of concrete with various recycled aggregate content, and the strength of recycled concrete with steel fiber, The deformability can be improved remarkably and can meet the requirements of strength and deformation. It can be popularized and applied in engineering.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU528

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