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首页> 外文期刊>Journal of materials in civil engineering >Effect of Cyclic Loading Deterioration on Concrete Durability: Water Absorption, Freeze-Thaw, and Carbonation
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Effect of Cyclic Loading Deterioration on Concrete Durability: Water Absorption, Freeze-Thaw, and Carbonation

机译：循环荷载恶化对混凝土耐久性的影响：吸水，冻融和碳化

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摘要

The effect of cyclic loading deterioration on freeze-thaw and carbonation resistances of concrete were experimentally investigated in this study. A novel loading method was designed, which simultaneously considers both mechanical loading and environmental actions for concrete. It shows that with the increase of cyclic compressive loading, the porosity and water absorption of concrete initially decrease but then increase when the stress is above a threshold level because of the cracking initiation caused by cyclic compression. With the increase of concrete porosity, both dynamic elastic modulus loss and carbonation depth obviously exhibit an increasing trend. On the other hand, under the same stress level, the freeze-thaw and carbonation resistances of high-strength concrete are relatively superior to those of low-strength concrete. Compared with the unloaded concrete, the carbonation depth and dynamic elastic modulus loss after mechanical loading below the stress level threshold are lower. This is probably due to the denser microstructure compacted by the compression. However, if the loading level becomes above the threshold level, both the carbonation depth and dynamic elastic modulus loss dramatically increase, which is due to the cracks initiation and propagation after cyclic loading deterioration. Therefore, the combination of mechanical and environmental actions is more severe than a single environmental action without considering the mechanical loading.
机译：通过实验研究了循环荷载恶化对混凝土的抗冻融性和抗碳化性的影响。设计了一种新颖的加载方法，该方法同时考虑了混凝土的机械加载和环境作用。结果表明，随着循环压缩载荷的增加，混凝土的孔隙率和吸水率开始下降，但当应力超过阈值水平时，由于循环压缩引起的开裂，混凝土的孔隙率和吸水率随之增加。随着混凝土孔隙率的增加，动弹性模量损失和碳化深度均呈现明显的增加趋势。另一方面，在相同应力水平下，高强度混凝土的抗冻融性和抗碳化性要优于低强度混凝土。与未加载的混凝土相比，在低于应力水平阈值的情况下，机械加载后的碳化深度和动态弹性模量损失较低。这可能是由于压缩所致密的微观结构。但是，如果载荷水平超过阈值水平，则碳化深度和动弹性模量损失都会急剧增加，这是由于循环载荷恶化之后裂纹的萌生和扩展所致。因此，机械和环境作用的组合比不考虑机械载荷的单个环境作用更为严峻。

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