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You have to be very careful that portland cement doesn't stain your pavers. Especially concrete and dry pressed clay ones.
The idea of the polymeric sand is to be able to flex. You are creating a flexible pavement. If you try to have a rigid pavement, eg- pavers with a sand / cement joint, over a flexible base, the rigid pavement will fail. That is the sand / cement joint will crumble. If you want to grout your joints you have to wet lay the pavers or flagstone on a reinforced concrete base.
I laid a 4,500sq metre (approx 45,000 sq ft) mall using dry pressed clay pavers with sand / cement joints. This was the laying procedure the Designer wanted. The pavers stained badly, and the joints eventually crumbled. I never did it that way again.
As far as I know Polymeric sand is only suitable for tight joints in pavers. Say 1/8in.
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