With recycled raw materials such as gravel and sand, which come from our activities at Carmans Aannemingen and our soil purification and recycling center, we produce BLUEBLOCKS in our own concrete plant. Concrete stacking blocks which, like Lego blocks, are easy to stack and are produced entirely using renewable energy. Our range of concrete stacking blocks consists of more than 10 formats equipped with round studs for an aesthetic finish and quick and easy installation.