how reduce water absorption in recycled course aggregate? plz suggest any technical method or any other material for reducing water absorption ratio in concrete (in recycle aggregate)
Water absorption is the inherent property of the natural aggregates and depends on geological nature of source rocks. However, in the recycled aggregates this depends on extent to which we are able to remove the coating of cement matrix from the surface of the recycled aggregates. In fact this surface layer is the cause of increased water absorption in the recycled aggregates and effort should be made to economically free the aggregate from such layer.
Water absorption is the inherent property of the natural aggregates and depends on geological nature of source rocks. However, in the recycled aggregates this depends on extent to which we are able to remove the coating of cement matrix from the surface of the recycled aggregates. In fact this surface layer is the cause of increased water absorption in the recycled aggregates and effort should be made to economically free the aggregate from such layer.
I agree with the previous answer. In any case, absorption during the mixing can be reduced by moistening aggregates before introducing them into the concrete mixture.... It's very common, you'll find many references regarding this topic.
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Think of reducing water absorption by adding substances that reduce water.
Greetings
There are chemical admixtures that could prevent surface absorption and ingress of water
Yes, the most practical e way to avoid the water absorption is to wet them until the stable stage before using these recycled aggregates. In fact, if you think about the water absorption vs square root of time curve, basically you just need to avoid the rapid absorption and after that water can only transport into gel pores which is very limited.
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