Effect of Fly Ash Contents on the Durability and Mechanical Properties of Recycled Fine Aggregate High Ductility Cementitious Composites
Xinjie Wang , Olivier Byiringiro , Jiagai Yang , Pinghua Zhu , Xiancui Yan , Hui Liu
Journal of Wuhan University of Technology Materials Science Edition ›› 2025, Vol. 40 ›› Issue (5) : 1477 -1487.
The effects of various fly ash (FA) contents on the durability and mechanical properties of recycled fine aggregate high ductility cementitious composites (RFA-HDCC) prepared with recycled fine aggregates (RFA) to fully replace natural fine aggregates was investigated. The results indicated that a 50% FA content significantly increased the compressive strength of RFA-HDCC by 13.93%. However, a further increase in FA content led to a drastic decrease. The increased fly ash content substantially reduced the flexural and tensile strength; however, it markedly increased the matrix strain capacity, resulting in a 53.73% increase in the peak strain when FA was raised to 70%. Regarding durability, the increase in FA content negatively affected the chloride ion permeability and carbonation resistance. However, the increase in FA content initially improved the frost resistance of RFA-HDCC, peaking at 50% FA and deteriorating at 60% and 70% FA content.
high ductility cementitious composites / durability / fly ash / recycled fine aggregate
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Wuhan University of Technology and Springer-Verlag GmbH Germany, Part of Springer Nature
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