Higher porosity of recycled aggregate compared to natural aggregate leads to a higher absorption.
Moreover, recycled aggregate has lower specific gravity than natural aggregate and will make concrete with higher drying shrinkage and creep.
Such differences become more significant when there is an increasing amount of recycled fine aggregates.
Recycled aggregates also contains more chloride than normal aggregates which may affect the durability of concrete.
Furthermore, excessive recycled fine aggregates can also generate a harsh concrete mix with low workability.
