基于CT扫描的环氧树脂基混凝土裂缝观测与冲击损伤演化研究

发布时间：2018-04-01 11:39

  本文选题：环氧树脂基混凝土　切入点：CT扫描　出处：《实验力学》2017年04期

【摘要】：环氧树脂基混凝土是一种新型路面铺装材料。本文估算了道路使用过程发生"跳车"现象时货车车轮对路面产生的冲击荷载,根据计算结果,利用落锤冲击试验机对含有不同程度初始损伤的环氧树脂基混凝土试件进行多次冲击试验,研究其冲击疲劳现象。为了准确描述环氧树脂基混凝土的初始损伤,采用CT(计算机断层)扫描技术重构了试件的立体图像,对其中的内部裂缝进行了统计,建立了初始损伤裂缝体积占试件体积的百分比与基于材料弹性模量衰减的损伤变量之间的关系。通过追踪经受一定次数冲击后试件的弹性模量,分析了不同程度初始损伤下环氧树脂基混凝土的冲击损伤随冲击次数的变化规律;结合多次冲击荷载下环氧树脂基混凝土弹性模量的衰减,研究了初始损伤对环氧树脂基混凝土冲击疲劳过程中损伤演化规律的影响。
[Abstract]:Epoxy resin based concrete is a new pavement pavement material.In this paper, the impact load on the pavement caused by the wheel of the freight car is estimated when the phenomenon of "jump" occurs in the course of road use, and according to the calculation results,The impact fatigue phenomenon of epoxy resin based concrete specimens with different initial damage was studied by impact test machine.In order to accurately describe the initial damage of epoxy resin based concrete, the three-dimensional images of the specimens were reconstructed by CT (computed Tomography) scanning technique, and the internal cracks were statistically analyzed.The relationship between the percentage of initial crack volume and specimen volume and the damage variables based on the attenuation of elastic modulus of materials is established.By tracing the elastic modulus of the specimens subjected to a certain number of shocks, the variation of the impact damage with the impact times of epoxy resin based concrete with different initial damage is analyzed.Combined with the attenuation of elastic modulus of epoxy based concrete under multiple impact loads, the effect of initial damage on damage evolution of epoxy based concrete during impact fatigue was studied.
【作者单位】： 华南理工大学土木与交通学院;福州百盛精细化学品有限公司;
【基金】：国家自然科学基金(11272124,11472109) 广东省交通运输厅科技项目(科技-2012-02-033,科技-2013-02-095)资助
【分类号】：O346;U414
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本文编号：1695442