Freeze-thaw Durability of Recycled Aggregate Concrete: An Overview

The characteristics of surface appearances, mass loss, relative dynamic modulus of elasticity and strength loss of different recycled aggregate concretes(RAC) exposed to freeze-thaw cycles were analyzed. It was found that the freeze-thaw resistance of RAC could be determined by the recycled aggregate compositions and admixtures. Both the saturation degree and the air void structure were the key factors influencing the freeze-thaw damage on concrete. Some major proposed freeze-thaw deterioration mechanisms were utilized to interpret the freeze-thaw damage on recycled aggregate concrete. Meanwhile, some potential measures to enhance the freeze-thaw resistance of concrete were summarized and discussed.

Automated summary

The study identified that the freeze-thaw resistance of recycled aggregate concrete is influenced by the recycled aggregate compositions and admixtures, with saturation degree and air void structure being key factors in freeze-thaw damage. Various proposed mechanisms were used to interpret this damage, with potential measures to enhance freeze-thaw resistance also discussed.