I am doing research on compressive strength and workability on concrete by using coconut shell replace the course aggregate. What I worried about is its COCONUT HUSK, is it really reduce the concrete strength or not? If you got an attachment or link please include it.
Make some mixes, make cylinders, do compressive strength tests, break the cylinders, and find out.
Not very experienced in coconut shell, but I world expect a change in concrete rheology so that water/plasticizer amount would increase (flat aggregates are very good at that). And that would affect strength with no doubt.
Watch out for possible sugar or other retarding extractives being released in the batching water.
This is considered as light aggregate, so the strenght will be reduced, compared to conventional concrete.
I agree that the strength will be reduced.
See for example this article:
http://www.ijeijournal.com/papers/v1i6/D0162131.pdf
or:
http://www.sciencedirect.com/science/article/pii/S0360132305000429
Yup using coconut shell as aggregate in concrete reduces compression strength adversely for a M20 grade concrete as tested we got only 15 Kpa for only 20% replacement of fine aggregate
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