[ non-metallic building materials; namely, concrete building blocks, pavers and tiles, cementitious walling; namely, pre-cast concrete wall panels, non-metallic bridge components; namely, pre-cast concrete beams, curbs, abutments, railings, safety barriers, piles and foundations; non-metallic poles for carrying electric lines; namely, concrete power poles; non-metallic rigid pipes for building; concrete drain pipes; concrete safety crash barriers for roads; ] concrete ties