Title:
Fatigue Performance of Recycled Aggregate Concrete Beams with Corroded Steel Reinforcement
Author(s):
Guoqing Dong, Jin Wu, and Xing Zhao
Publication:
Structural Journal
Volume:
119
Issue:
2
Appears on pages(s):
123-137
Keywords:
fatigue life; fatigue stress amplitude; mass loss percentage; recycled aggregate concrete
DOI:
10.14359/51734333
Date:
3/1/2022
Abstract:
This experimental research investigates the effects of corrosion on the fatigue performance of reinforced recycled aggregate concrete (RAC) beams as well as the mechanical properties of corroded reinforcement in beams after fatigue loading. In addition, the decreasing trend of fatigue life with rising corrosion degree and the loss of fatigue life induced by steel corrosion for reinforced concrete beams are exhibited and analyzed, respectively. It was found that greater fatigue stress amplitude and increased corrosion degree tended to enlarge the maximum width of cracks and midspan deflection, as well as aggravating the damage degree of reinforced RAC beams at failure. After corrosion fatigue, characteristics of load-displacement curves for reinforcements changed significantly: the yield strength and ultimate strength decreased, features of yield plateau changed. The more the mass loss percentage of steel bars, the less the fatigue life of reinforced RAC beams. With the increase of corrosion degree, the reinforced RAC beams subject to large fatigue stress amplitude shows a steeper decline in fatigue life than reinforced RAC beams subject to relatively small fatigue stress amplitude. Compared with reinforced natural aggregate concrete (NAC), reinforced RAC suffers larger fatigue life loss and exhibits a steeper decline in fatigue life with rising corrosion degree.
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