Broken concrete can be fixed by bonding or gluing the pieces back together. There are a few options available to you and what adhesive material you use depends on what type of bond you need for the concrete repair.
Concrete urethane is a reliable product for fixing some broken concrete, and is a much better and stronger concrete adhesive agent than silicone. Concrete urethane provides a solid bond and has flexibility, similar to silicone (which is not the correct product to use for fixing broken concrete), that may be needed in certain repairs, especially if outdoors and exposed to both hot and cold weather. The fluctuating temperatures cause expansion and contraction which the flexibility of the urethane can handle.
Construction grade adhesive or construction epoxy is another product that will give you a very strong bond for fixing broken concrete. It does not have the flexibility that concrete urethane has and this limits some of the repairs construction adhesive can be used for. It has an incredibly strong, especially if the repaired concrete is in a controlled environment.
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