基于阻尼增强的梯度结构混凝土的阻尼特性和界面性能
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国家自然科学基金资助项目(51562024);江西省杰出青年人才资助计划(20162BCB23014)


Damping Characteristics and Interface Properties of Gradient Structural Concrete Based on Damping Enhancement
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    摘要:

    基于梯度功能设计理念,制备了阻尼增强的梯度结构混凝土(GSCDE),同时采用自由振动法、抗压强度试验、显微硬度计、环境扫描电镜等方法和仪器来分别测试GSCDE的阻尼特性、抗压强度、界面显微硬度、界面微观结构.结果表明:随着阻尼层厚度比例的增加,GSCDE阻尼比随之递增,抗压强度则随之递减,立方体试件破坏时外观的损伤程度得到改善;GSCDE阻尼比可达396%以上,抗压强度可达550MPa以上;与单层高性能混凝土(HPC)或单层高阻尼混凝土(HDC)相比,GSCDE能兼顾阻尼特性和强度,解决了高阻尼混凝土的组合减振结构一体化问题;在GSCDE阻尼层和结构层之间的界面结合区中,显微硬度从阻尼层到结构层均匀递增,2种混凝土相互渗透形成致密、均匀、稳定的整体;GSCDE中界面结合区的结合情况良好,有利于提高GSCDE的力学性能和阻尼特性.

    Abstract:

    Based on the idea of gradient functional design, gradient structural concrete based on damping enhancement(GSCDE) was prepared. Damping characteristics, compressive strength, interface microhardness and interface microstructure of GSCDE were investigated by means of free vibration method, compressive strength test, microhardness tester and ESEM, respectively. The results show that with the increase of thickness ratio of damping layer, damping ratio of GSCDE increases, but compressive strength decreases. The degree of damage to the appearance of cube specimens is improved. Damping ratio of GSCDE is more than 396% and compressive strength reaches 550MPa. Compared with single layer high performance concrete(HPC) or single layer high damping concrete(HDC), GSCDE can achieve a better balance between damping and strength. GSCDE can effectively solve the problem of combination damping structure integration of high damping concrete. In interface bonding zone between damping layer and structural layer of GSCDE, interface micro hardness uniformly increases from damping layer to structure layer. Moreover, the two kinds of concretes, damping layer and structural layer, have penetrated each other to form a dense, uniform, and stable whole. Interface bonding zone of GSCDE combines well, and it is beneficial to improve mechanical properties and damping characteristics of GSCDE.

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王信刚,吴链,卢峰.基于阻尼增强的梯度结构混凝土的阻尼特性和界面性能[J].建筑材料学报,2018,21(5):780-785

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  • 收稿日期:2017-10-18
  • 最后修改日期:2018-04-20
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  • 在线发布日期: 2018-10-31
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