An Experimental Study on Carbonation in the Tensile Zone of Fatigue-Damaged Plain Concrete Beams

Abstract:

This paper investigates the accelerating effect of fatigue damage on carbonation process through an experimental study. A total of 30 prism specimens, categorized by A or B according to the cement type used, were cast in this experiment program. Mid-span deflection-and beam bottom strain-based damage indexes were proposed to estimate fatigue damage states for type A and B specimens, respectively. After static and fatigue failure tests for 10 specimens, 16 specimens were subjected to fatigue loading up to the prescribed damage states. Subsequently, these fatigue-damaged specimens and four intact specimens were put together into a chamber filled with high concentration CO₂ gas, and carbonation depths were measured after 14, 28, and 49 days. Carbonation tests showed that fatigue damage could increase the mean carbonation depth by 150% and that the regressed linear expression between the normalized mean carbonation depth and fatigue damage index for each type specimen agreed well with experimental data. Normal distribution models for carbonation depths in fatigue-damaged concrete were proposed and found to be comparable with the realistic frequency distribution histograms.

• Periodical: Key Engineering Materials (Volume 711)
• Pages: 751-758
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.711.751
• Online since: September 2016
• Authors: Chao Jiang, Xiang Lin Gu*, Wei Zou
• Keywords: Carbonation, Concrete, Fatigue Damage, Probability Distribution, Statistical Characteristics

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