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Pavers are prepped in such a way because they move with freeze thaw. if you mortar joints and things are moving with freeze thaw, the result is that something has to give. Even if you do this on a slab, the slab has to have control joints if the size and shape of it merit it. Then you don't span the control joint with stone or mortar. There is a flexible joint material called Deco-Seal that you can get in many colors that pours into the joint and looks like a mortar joint, but is water tight.
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