Building materials (non-metallic); non-metallic pipes for building including concrete pipes for drainage; non-metallic poles for carrying electric power lines including concrete power poles; non-metallic kerbs, kerbside drains, pits, manholes and inlets including those made of concrete; non-metallic building elements including concrete blocks, bricks, slabs, pavers and tiles; concrete safety barriers; building materials used in the manufacture of roads; non-metallic drainage systems and elements including those made from concrete and other drainage systems and products in this class; concrete and concrete building elements