Concrete glue is an adhesive designed for adhering porous concrete to other surfaces a difficult task without the right product. Because of the sometimes tricky nature of concrete surfaces, special formulas are created for each type of material you’ll need to bond it to. In fact, you can use a construction adhesive for gluing metal to concrete, fixing up crumbling roadways, and even garden stones. Whatever the job, there’s an adhesive to help you get it done.