Effects of fatigue loading and alkali–silica reaction on the mechanical behavior of pavement concrete
Effects of fatigue loading and alkali–silica reaction on the mechanical behavior of pavement concrete
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DOI：
10.1002/suco.201600179
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发表时间：
2017-05
影响因子：
3.2
通讯作者：
A. Wiedmann;F. Weise;E. Kotan;H. Müller;B. Meng
中科院分区：
文献类型：
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作者：
A. Wiedmann;F. Weise;E. Kotan;H. Müller;B. Meng
本文的主要目的是分析机械预损伤和碱-硅酸反应(ASR)对路面混凝土断裂力学性能的影响。为此，对大幅面梁进行了四点弯曲试验，以产生确定的循环预损伤水平。使用专门为此目的开发的测试程序，同时记录了疲劳引起的混凝土退化过程。此外，还利用显微X射线三维计算机层析成像(3D-CT)对所提取的钻芯上的疲劳裂纹进行了空间可视化和量化。在有利于ASR的环境中，在有和没有循环预损伤的情况下存储小尺寸测试样品表明，预损伤导致ASR损伤过程的增加。随后对有无预损伤的小尺寸试件的结构力学研究表明，疲劳荷载和ASR对混凝土的断裂力学参数有显著影响。
The primary aim of this paper is to analyze the impact of mechanical pre‐damage and alkali–silica reaction (ASR) on the fracture mechanical properties of pavement concrete. For this purpose, a four point bending test was applied to large format beams to produce a defined level of cyclic pre‐damage. The fatigue‐induced concrete degradation process was simultaneously recorded using a testing procedure specifically developed for the purpose. In addition, fatigue‐induced cracks on extracted drilling cores were spatially visualized and quantified using micro X‐ray 3D‐computed tomography (3D‐CT). The storage of the small‐format test specimens, with and without cyclic pre‐damage, in an ASR‐conducive environment showed that pre‐damage leads to an increase in ASR damage processes. Subsequent structural mechanical investigations on small format specimens with and without pre‐damage show that fatigue loading and ASR significantly influence fracture mechanical parameters of the concrete.