Control joints are placed in concrete slabs to relieve tension as the slab cures. Installing or cutting a joint of this type, therefore, directs cracking in a controlled manner. Once the slab has cured, the joints have served their purpose. While there may be future movement, it should be gradual and within a fixed range as the seasons change. It’s a judgement call to fill or leave them open.
The video documents a joint fill process that’s dedicated to the proper preparation and filling of control joints. It’s a preparation method that may or may not be relevant to all joint fillers, but the full process here is specific to this particular product type.
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