Joints are the manufactured seams between slabs of concrete. They are cut into the concrete on purpose. The reason the joints are cut into the substrate is because concrete can swell and shrink with along with the ambient temperature. Cold makes it contract, while heat makes it expand. The joints allow a little freedom of movement for the substrate. The issues come when the joints begin to give way to the slab's movements and run into each other. When the slabs run into each other, they weaken and form cracks. Once cracking begins, the only way to stop them from widening into chasms or spidering throughout the entire floor, is to patch the cracks and fix the joints. It can be time consuming and somewhat expensive if you wait until it gets that bad. The good news is that all this preventable by filling the joints.
Joint fill is a two part polyurea that is rigid enough to withstand the movements of the concrete, but also flexible enough to allow the substrate to move around without running into itself. This can prevent future cracks and holes from popping up. It will also alleviate the pressure that caused any existing cracks.
The prep for this is simple. Saw cut the joints to clean everything out of them. Then vacuum them in order for the joint fill to get a mechanical bond to the insides of the joints. A machine that has 2 tanks on a cart with a nozzle, is what shoots the material into the joints, filling them completely up, and overflowing them a little. After the 15 minute cure time, they are razor shaved totally flush with concrete. That is all there is to it. This stuff is amazing.
Joint reconstruction is what you need when the joints in your floor have been eroded away and are now giant hazards. The best way to fix joints that are destroyed is to path them all back with en epoxy mortar and cut new joints into the mortar after it cures. Then you fill the new joints with the joint fill and shave them flat. Depending on how many joints need reconstructed, this is normally a two day job.
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