Research on Frost Resistance of Recycled High Performance Concrete
The influence of recycled aggregates on the frost resistance of concrete was studied by rapid freezing-thawing test. Results showed that there was an important effect of aggregate gradation on frost resistance of recycled coarse aggregate concrete. Frost resistance of recycled fine aggregate concrete was deteriorated with increasing the content of recycled fine aggregate, and recycled fine aggregate had a greater influence on the frost resistance of recycled aggregate concrete than recycled coarse aggregate when adding both together. Test showed that the mass loss rate and the relative dynamic elastic modulus loss are not consistent as evaluation indexes of the frost resistance for recycled concrete, and whether the mass loss rate is suitable as an indicator of frost resistance durability needs to be further studied.