The sulfate transfer characteristics in recycled aggregate concrete incorporated with fly ash under percolation theory

作者：Song Gao, Zhenwei Qin, Wu-Jian Long, Xin Guo, Yuan Ji, Hengwu Zhang, Fei Xing, Shiyinuo Wang, Ang Liu · 发表于：Case Studies in Construction Materials · 年份：2023 · DOI：10.1016/j.cscm.2023.e02774 · 被引用次数：5 · 研究领域：Recycled Aggregate Concrete Performance、Concrete and Cement Materials Research、Concrete Corrosion and Durability

Recycled aggregate concrete (RAC) has multiple interface transition zones (ITZs) due to its complex composition, providing convenient ion transfer channels. Therefore, it is significant to explore the changes of the internal pore structure in RAC under ion erosion conditions for quantifying and predicting ion transfer mechanisms. This paper innovatively utilizes the seepage effect for investigating the evolution of pore structures in RAC under sulfate attack. We conduct a systematic experimental study on the transport of sulfate ions in RAC with different fly ash (FA) substitution rates under dry-wet cycles. Combining backscattered electron imaging (BSE), permeation and fractal characteristics, this paper deeply explore the relationship between pore structure feature, sulfate percolation mechanism and the macroscopic properties of RAC incorporated with different amount of FA.