Frost Resistance of Recycled Concrete: A Review

This paper presents a comprehensive analysis of the current state of research on the frost resistance of recycled aggregate concrete at home and abroad and finds that micro-cracks in recycled aggregates and the fragile interfacial transition zone of concrete have a significant impact on the frost resistance of recycled aggregate concrete. As the replacement rate of recycled coarse aggregate rises, recycled aggregate concrete becomes less resistant to frost. It is consequently advised that the replacement rate of recycled coarse aggregate not surpass 50%. At this rate, the frost resistance of recycled aggregate concrete is most similar to that of regular concrete. In addition, the addition of silica fume, ferronickel slag, glazed hollow bead, polypropylene fibres and air-entraining water-reducing agents can effectively improve the frost resistance of recycled aggregate concrete. In the future, more systematic and in-depth research on the freeze-thaw damage mechanism of recycled aggregate concrete is needed, and a more complete theoretical model should be established.