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Joining Concrete made with different aggregate

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We have designed a 4 storey apartment building using 5inch thick reinforced concrete walls in both directions. The problem is that the cheaper naturally occuring gravel for manufacturing concrete is in short supply. A more expensive crushed stone aggregate is readily available. Concrete made with both types of aggregate are capable of achieving the required strength and durability.
It is therefore most economical to use concrete made from both types of aggregates on the same building. The naturally occurring gravel is brown in colour, rounded and with an even mixture of sizes from 1/2" to 3/4". The crushed stone is grey, angular and more consistant in size. Is there any structural problems in joining the different types of concrete vertically in walls or horizontally in slabs.
thank you
mark francois