Road engineering is a pretty mature discipline. If this idea can't pass some of the basic known challenges in a thought exercise, why bother testing it? For example, they have no explanation as to how the tiles will be adhered to the surface. Silica has poor adherence to asphalt in wet conditions, and silica can react poorly with alkyds in portland cement. Both of those are big hints that it might be impossible to stick these tiles down for their claimed 20 year lifetime.