Don't you find it odd when you see that numerous concrete slabs have gaps that have not been filled completely? If you take a closer look, you will find that the gaps have been filled but the entire surface has not been smoothed over. This is done on purpose.
This is not absence of finish. Rather, this is a calculated effort to make sure that the expansion and contraction of the concrete takes place before the joint is completely filled. The gap that you see between the two concrete slabs is actually a joint. The joint has probably been placed to provide for the expansion that will take place on the concrete is exposed to heat.
The material that is used in the joint absorbs the stresses and prevents the concrete from cracking. The presence of the material also ensures that it does not become a gap from where water and moisture can enter.
Well, why is the joint not covered completely? It will take at least a year for the concrete to completely expand and contract and for the expert to determine whether the joint has been properly filled or not. In such a scenario, to completely cover the joint and fill it is only going to create complications.
In the larger scheme of things, where the concrete slab functions for 40 years at a stretch, there is absolutely nothing wrong in waiting for a year to complete the filling process. In such a scenario, you should be prepared to be patient.
This is particularly important if you are making use of the slab for heavy duty purposes. If you intend to use your car weighing a few tons on the concrete slab in your driveway, it is obvious that the gap should not be filled in hurry.
Remember, concrete, despite its hardness, is certainly going to suffer damage if you start chipping it and banging it just to loosen the filling material. It is advisable to consult with experts before you proceed. There are numerous experts on the internet. Not all of them charge a lot of money. Not all of them charge any money at all.
You can easily make use of forums to find out information relating to the joints and the manner in which it should be filled from different individuals and experts. Of course, do not use this to completely duplicate the opinion of the experts.
Yet, make sure you do not end up paying a lot of money to find out something that is already available on the internet for free.
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