改性再生混凝土梁、柱性能试验研究

发布时间：2018-06-22 15:19

本文选题：硅粉 + 砖粒　；参考：《西安建筑科技大学》2014年硕士论文

【摘要】：随着城镇化进程的加快，建筑垃圾的堆积量达到了前所未有的高度。利用建筑垃圾制备再生混凝土以达到废弃物的回收再利用，已成为当今的热门话题。基于此，本文利用课题组收集到的再生骨料，充分利用硅粉的填充及其活性，纤维的增韧阻裂特性以及砖粒的吸水率大等特性，设计并制作了不同掺入量的硅粉、砖粒改性再生混凝土试块，并以此试验特性为基础，制作了不同掺合料的11根改性再生混凝土梁与5根不同掺量的柱，对梁、柱进行了相关性能试验，所得试验结果如下所示：（1）以不同掺量的硅粉、砖粒为主要参数，对改性再生混凝土试块进行了立方体及轴心抗压强度、抗折强度、劈裂抗拉强度以及弹性模量的试验研究，分析了不同掺合料的改性再生混凝土的力学材料性能。（2）以不同掺合料的试块力学性能为基础，设计并制作了11根硅粉、砖粒改性再生混凝土梁，对其进行三分点加载试验，对其荷载—位移曲线、承载力及变形等进行了对比分析，得到了三种改性材料对试件梁各性能的影响结果。（3）以某实际框架柱为基础，采用1：2的缩尺准则，设计了5根硅粉、砖粒改性再生混凝土柱的低周反复荷载试验，并对其破坏规律、滞回曲线、骨架曲线、延性性能、刚度衰减、能量耗散等抗震性能综合指标进行了计算分析，并得到了一些可供参考的结论与建议。研究结果表明，硅粉的掺入能够增强再生混凝土的抗压强度；少量的砖粒的掺入使试块的抗压强度与轴心抗压强度有小幅度的提高。同时少量的硅粉能够降低试件梁的各挠度特征值，适量的硅粉能够提高再生混凝土梁的开裂荷载；少量的砖粒能够提高再生混凝土梁的开裂荷载，使其屈服荷载与极限荷载均出现不同程度的降低；且降低的幅度随掺量的增加而变大。 RAC柱抗震性能试验表明，硅粉的掺入，能够使试件柱的滞回环面积明显变小，延性变差，，耗能降低、刚度退化和承载力衰退加快；砖粒的掺加使试件柱的正向承载力有所提高。不管何种掺入料，掺料过高，均会使延性性能变弱，刚度衰减速率加快，脆性增强。
[Abstract]:With the acceleration of urbanization, the accumulation of construction waste has reached an unprecedented height. It has become a hot topic to make recycled concrete from construction waste to achieve waste recycling. Based on this, the recycled aggregate collected by our research group is used to make full use of the properties of silicon powder filling and its activity, toughening and cracking resistance of fiber, and high water absorption rate of brick particles. Based on the properties of brick modified recycled concrete, 11 modified recycled concrete beams with different admixtures and 5 columns with different contents were made, and the properties of beams and columns were tested. The experimental results are as follows: (1) the cube and axial compressive strength and flexural strength of the modified recycled concrete test blocks are carried out with different amount of silica powder and brick particles as the main parameters. The mechanical properties of modified recycled concrete with different admixtures were analyzed. (2) based on the mechanical properties of different admixtures, 11 silicon fumes were designed and manufactured. The concrete beams modified with brick particles were subjected to tri-point loading tests. The load-displacement curves, bearing capacity and deformation of the beams were compared and analyzed. The effects of three kinds of modified materials on the properties of the beams are obtained. (3) based on a practical frame column, five concrete columns modified with silica powder and brick particles are designed by using the 1:2 scaling criterion. The failure law, hysteretic curve, skeleton curve, ductility, stiffness attenuation, energy dissipation and so on are calculated and analyzed, and some conclusions and suggestions for reference are obtained. The results show that the compressive strength of recycled concrete can be enhanced by the addition of silica powder, and the compressive strength and axial compressive strength of the test block can be improved by a small amount of brick particles. At the same time, a small amount of silicon powder can reduce the deflection characteristic value of the beam, appropriate amount of silicon powder can increase the cracking load of recycled concrete beam, a small amount of brick particles can increase the cracking load of recycled concrete beam, and a small amount of brick particles can increase the cracking load of recycled concrete beam. The results show that both yield load and ultimate load decrease in varying degrees, and the amplitude of decrease increases with the increase of the content. The seismic behavior test of RAC column shows that the hysteretic loop area of the specimen column can be obviously reduced by the addition of silica fume. The ductility becomes worse, the energy consumption decreases, the stiffness degenerates and the bearing capacity declines faster, and the positive bearing capacity of the test column is improved by adding brick particles. No matter what kind of admixture is added, the ductility property is weakened, the stiffness attenuation rate is accelerated and the brittleness is enhanced if the admixture is too high.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU37

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