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首页> 外文期刊>Construction and Building Materials >Influence of grouting condition on crack and load-carrying capacity of post-tensioned concrete beam due to chloride-induced corrosion
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Influence of grouting condition on crack and load-carrying capacity of post-tensioned concrete beam due to chloride-induced corrosion

机译：注浆条件对氯化物腐蚀引起的后张混凝土梁裂缝和承载力的影响

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摘要

Chloride-induced corrosions of a sheath and a prestressing tendon in post-tensioned concrete (PC) beams are investigated under different grouting conditions. Two series PC beams were tested by the electrically accelerated corrosion. The first series of accelerated corrosion tests were performed to determine the influence of grouted ratios in a straight sheath on the corrosion of the sheath and the prestressing tendon. In the second series of tests, the influence of the length of grout filling was investigated in a curved sheath on the corrosion process. After the accelerated corrosion tests, the mechanical behavior of the deteriorated PC beams was investigated under flexural loading. The results of the experiments show that corrosion of the sheath and the prestressing tendon significantly decreases the load-carrying capacity of PC beams. As the grouted ratios in the straight sheath and the length of grout filling in the curved sheath increase, the cracks due to corrosion of the sheath propagate earlier along the prestressing tendon and the width of the cracks increases. From the view point of load-carrying capacity, it is verified that proper grouting can protect a prestressing tendon from corrosion despite the wider cracks due to corrosion of the sheath. The presence of water inside the sheath leads to increased corrosion of both the sheath and the prestressing tendon, resulting in the decrease in the load-carrying capacity of the PC beam.
机译：在不同的灌浆条件下，研究了氯离子对后张混凝土（PC）梁中护套和预应力筋的腐蚀作用。通过电加速腐蚀测试了两个系列的PC梁。进行了第一批加速腐蚀试验，以确定直套管中的注浆比对套管和预应力筋的腐蚀的影响。在第二系列测试中，研究了在弯曲护套中灌浆长度对腐蚀过程的影响。在加速腐蚀试验之后，研究了在挠曲载荷下劣化的PC梁的机械性能。实验结果表明，护套和预应力筋的腐蚀显着降低了PC梁的承载能力。随着直鞘中的灌浆比和弯曲鞘中的灌浆长度的增加，由于鞘的腐蚀引起的裂纹沿着预应力筋更早地传播，并且裂纹的宽度增加。从承载能力的观点来看，已证实，尽管由于护套腐蚀而产生的裂缝较大，但适当的灌浆仍能保护预应力筋不受腐蚀。护套内部存在水会导致护套和预应力筋的腐蚀增加，从而导致PC梁的承载能力下降。

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