车桥耦合振动对新拌混凝土力学性能的影响研究
发布时间：2018-08-12 16:38
【摘要】：采用室内模拟振动对新浇筑混凝土性能的影响,分析行车荷载引起的车桥耦合振动作用对桥梁维修中新浇筑混凝土性能的影响,研究发现:在混凝土凝结初期,不同组合振动对混凝土7 d、14 d和28 d抗压强度都有所提升,而在凝结中期与凝结后期,振动组混凝土抗压强度明显低于静置组,但随着凝期的增长,强度损失有所降低;混凝土抗折强度与劈裂强度对微小裂纹与气孔敏感性较强,不同凝结时期,振动组在抗折强度与劈裂强度均较静置组低,尤其在凝结中期强度值减少明显,两种强度损失率均在8%~14%之间。同时,随着凝期增长,混凝土内部水泥继续进行,对振动产生的微小裂隙有一定"修补"作用,因此,后期抗折强度与劈裂强度损失有所弥补。
[Abstract]:The influence of indoor simulated vibration on the performance of newly cast concrete is analyzed. The effect of vehicle-bridge coupling vibration caused by driving load on the performance of newly cast concrete in bridge maintenance is analyzed. The compressive strength of concrete increased by different combination vibration at 14 days and 28 days, but the compressive strength of the vibration group was obviously lower than that of the static group, but the strength loss decreased with the increase of the setting period. The flexural strength and splitting strength of concrete are more sensitive to micro-cracks and pores. The flexural strength and splitting strength of vibration group are lower than those of static group at different setting stages, especially in the middle stage of setting. The loss rate of both kinds of strength is between 8% and 14%. At the same time, with the increase of the solidification period, the cement inside the concrete continues to be carried out, which has a certain "repair" effect on the tiny cracks produced by vibration. Therefore, the loss of the later flexural strength and the splitting strength is made up for.
【作者单位】： 重庆交通大学交通土建工程材料国家地方联合工程实验室;重庆交通大学材料科学与工程学院;重庆交通大学土木工程学院;
【基金】：重庆市社会民生科技创新专项(cstc2016shmszx30010) 重庆交通大学交通土建工程材料国家地方联合工程实验室开放基金(LHSYS-2016—012)和重庆交通大学研究生科研创新项目(20160103)资助
【分类号】：U441.3;U444
本文编号：2179642
[Abstract]:The influence of indoor simulated vibration on the performance of newly cast concrete is analyzed. The effect of vehicle-bridge coupling vibration caused by driving load on the performance of newly cast concrete in bridge maintenance is analyzed. The compressive strength of concrete increased by different combination vibration at 14 days and 28 days, but the compressive strength of the vibration group was obviously lower than that of the static group, but the strength loss decreased with the increase of the setting period. The flexural strength and splitting strength of concrete are more sensitive to micro-cracks and pores. The flexural strength and splitting strength of vibration group are lower than those of static group at different setting stages, especially in the middle stage of setting. The loss rate of both kinds of strength is between 8% and 14%. At the same time, with the increase of the solidification period, the cement inside the concrete continues to be carried out, which has a certain "repair" effect on the tiny cracks produced by vibration. Therefore, the loss of the later flexural strength and the splitting strength is made up for.
【作者单位】： 重庆交通大学交通土建工程材料国家地方联合工程实验室;重庆交通大学材料科学与工程学院;重庆交通大学土木工程学院;
【基金】：重庆市社会民生科技创新专项(cstc2016shmszx30010) 重庆交通大学交通土建工程材料国家地方联合工程实验室开放基金(LHSYS-2016—012)和重庆交通大学研究生科研创新项目(20160103)资助
【分类号】：U441.3;U444
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