In the case of fines coming from demolition products, the optimum substitution percentage of fines in cement is between 15 and 20%
As stated by Mohammed above, it is about 20%. A lot of research has been done on the topic. Please see:
https://www.elsevier.com/books/handbook-of-recycled-concrete-and-demolition-waste/pacheco-torgal/978-0-85709-682-1
We have conducted studies on recycling of demolished concrete made with brick aggregate as coarse and fine aggregate. It is possible to replace natural brick aggregate by 100% recycled brick aggregate. The same is true for fine aggregate. Of course, you can do it partially. It is important to reduce W/C.
Takek,
This is really interesting, What sort of compressive strengths did you achieve, I mean how does it compare with concrete with standard aggregate?
Dear Dr. Saidani:
Thank you very much for your feedback on my comment. It is possible to get 30-35 MPa (with cement content - 340 kg/m3, W/C = 0.45 - 0,5). Note that we have investigated recycled concrete made with brick aggregate. You may get more detailed information from the following reference:
Mohammed, T. U., Hasnat, A., Awal, M. A., Bosunia, S. Z., (2015). “Recycling of Brick Aggregate Concrete as Coarse Aggregate”, Journal of Materials in Civil Engineering, Vol. 27, No. 7, July 2015, CID: B4014005,(doi: http://dx.doi.org/10.1061/(ASCE)MT.1943-5533.0001043).
Thank you.
We found that concrete made with up to 50% aggregate replacement for 0.5 w/c had moderate resistance to carbonation and chloride penetration; higher replacement of coarse aggregate or mixtures with higher w/c ratio are not recommended in terms of durability. Please check http://dx.doi.org/10.1155/2015/505423
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