基于截面截梁碳化试验的老桥寿命预测

R. Widyawati, A. Miyamoto, H. Emoto, J. Takahashi
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引用次数: 2

摘要

本文介绍了某钢筋混凝土桥截梁碳化试验的详细情况,提出了一种基于碳化和氯离子侵蚀导致钢筋腐蚀劣化程度来预测钢筋混凝土桥使用寿命的方法。使用寿命预测是桥梁维修系统化的重要组成部分。桥梁在其使用寿命期间通常暴露在一系列环境条件下。碳化可能导致RC桥的劣化,并可能对使用寿命产生重大影响。如果桥梁靠近大海,氯离子的侵蚀也会影响桥梁的劣化过程。许多先前的研究已经研究了碳化对RC桥的影响。然而,本文描述了碳化试验在桥梁横截面截梁上的第一个已知应用。本文给出了基于碳化和氯离子侵蚀的劣化程度来预测RC桥的使用寿命的流程图。结果表明,碳化是桥梁老化的主要原因,氯离子的侵蚀也是桥梁老化的原因之一。当钢的累积腐蚀量达到Q = 75 mg/ cm2的临界值时,则定义为使用寿命的结束。大桥的使用寿命预计在海侧和山侧约为81年(剩余寿命约为9年),在底部约为142年(剩余寿命约为70年)。由于对底部进行了修复工作,预计底部的使用寿命将更长。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Service Life Prediction of an Aged Bridge Based on Carbonation Tests of Cross-Section Cutting-Off Girders
This paper presents the details of carbonation tests conducted on cross-section cutting-off girders from a reinforced concrete (RC) bridge and proposes a method to predict the service life of an RC bridge based on the extent of deterioration associated with corrosion of the reinforcing bars due to carbonation and chloride ion attack. Service life prediction is a crucial part of systematization of bridge maintenance. Bridges are typically exposed to a range of environmental conditions over their service lives. Deterioration of RC bridges due to carbonation may occur and may have a significant effect on service life. Chloride ion attack may also influence the deterioration process if the bridge is located close to the sea. Many previous studies have examined the effect of carbonation on RC bridges. However, this paper describes the first known application of carbonation tests to cross-section cutting-off girders from a bridge. A flowchart is presented for the proposed method for predicting the service life of an RC bridge based on the extent of deterioration due to carbonation and chloride ion attack. The results show that the main factor in the deterioration of the bridge has been carbonation and that chloride ion attack has also contributed to the deterioration of the bridge. The end of the service life was defined as the point at which the cumulative amount of steel corrosion reached a critical value of Q = 75 mg/cm 2 . The service life of the bridge was predicted to be approximately 81 years (remaining life of approximately 9 years) on the sea side and mountain side and approximately 142 years (remaining life of approximately 70 years) on the bottom side. The service life for the bottom side was predicted to be longer because of repair work done on the bottom side.
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