Non-uniform model of relationship between surface strain and rust expansion force of reinforced concrete

作者：Fanxiu Chen, Yichen Zhong, Xinya Gao, Zuquan Jin, Endong Wang, Feipeng Zhu, Xinxing Shao, Xiaoyuan He · 发表于：Scientific Reports · 年份：2021 · DOI：10.1038/s41598-021-88146-2 · 被引用次数：54 · 研究领域：Concrete Corrosion and Durability、Structural Behavior of Reinforced Concrete、Concrete and Cement Materials Research

When operating within the environments rich with sodium chloride, steel bars of reinforced concrete structures are often subject to corrosion caused by surrounding erosive materials, and the associated rust expansion force due to corrosion takes a critical role in determining the durability of relevant reinforced concrete structures. By investigating the corrosion course of steel reinforcement with theory of elasticity, a numerical rust expansion model is established for the moment of concrete surface rupture based on non-uniform sin function. Cuboid reinforced concrete specimen with squared cross sections is tested to analyze the rust expansion when concrete cracks due to corrosive forces. The utility of the established expansion model is validated by numerical simulation with Abaqus through the comparison between the associated outcomes. The impacts of steel bar diameter and concrete cover thickness on the magnitude of rust expansion force are discussed.