Within the fresh state, the higher amount of water absorption results in a reduction of workability, as part of the water is instantously absorbed by the attached cement on the aggregates. This means that water can’t react with the newly added cement and thus in consequence reduces the water-cement-factor (w/c). As a result the concrete in the hardened state, will reach a higher compressive strength. While a having higher compressive strength is not a bad thing, the concrete will likely fail on the workability demands during compacting.
This means that there has to be a way to take the amount of attached cement into consideration while preparing the concrete mix. One way to take this variable into the mix is, prior to use, saturate the aggregate for a period of time. This eliminates the effect of the unreacted cement using water intended for the new mix.
This would mean that even with an unknown amount of variable unreacted cement contents on the aggregates, this recycled material can be used for structural concrete. This will provide a helping hand towards the goal of a more sustainable construction industry.