水泥粉煤灰混凝土中钢筋腐蚀速率的预测方程

IF 3 Q2 ENGINEERING, CIVIL
D. Tran, P. Sancharoen, P. Klomjit, S. Tangtermsirikul, Thi Hai Yen Nguyen
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引用次数: 2

摘要

本研究旨在将水泥-粉煤灰混凝土微观结构随时间的发展纳入新建结构和现有结构腐蚀严重程度的评估中。测定了不同水胶比、粉煤灰掺量和氯化物掺量配制的12个系列混凝土的电阻率、腐蚀电位和腐蚀速率。在前人模型的基础上,采用水化度、火山灰反应度、毛管孔隙度等随时间的发展规律。在提出的方程中考虑了腐蚀速率和随时间变化的发展之间的相关性。试验结果表明,低水胶比混凝土和粉煤灰混凝土的钢筋腐蚀速率较低。因为混凝土的微观结构变得更加致密,表现为水化程度高,孔隙率低。这种现象增加了混凝土的耐腐蚀性。此外,氯离子会加速钢筋的腐蚀速度。在粉煤灰混凝土中,由于粉煤灰能捕获游离氯离子,其加速腐蚀的效果有所不同。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Prediction equations for corrosion rate of reinforcing steel in cement-fly ash concrete
ABSTRACT This study is to incorporate the time-dependent development of microstructures of cement-fly ash concrete into the evaluation of corrosion severity for newly constructed structures and existing structures. The electrical resistivity, corrosion potential, and corrosion rate were determined for twelve series of concrete mixtures prepared with various water-to-binder ratios, fly ash contents, and chloride contents. The time-dependent developments of cement-fly ash paste, including hydration degree, pozzolanic reaction degree, and capillary porosity, are adopted based on previous models. The correlation between the corrosion rate and the time-dependent developments was considered for the proposed equations. The experimental results indicate that low water-to-binder ratio concrete and fly ash concrete show a low corrosion rate of reinforcement. Because the microstructure of concrete became denser, represented by a high degree of hydration and low porosity. This phenomenon increases the corrosion resistance of concrete. Besides, the chloride ions can accelerate the corrosion rate of reinforcement. Its effects of corrosion acceleration are found to be different in fly ash concrete because the fly ash can capture free chloride ions.
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来源期刊
CiteScore
3.90
自引率
9.50%
发文量
24
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