19 Non-metallic building materials namely, ready to use cement, cement, asbestos cements, wood-fiber reinforced cement boards, fire retardant cements, refractory cements, blended cements, cement base mixture for use in building; fireproof cement coatings; cement mortar for use in construction; cementitious materials and preparations, namely, cement, roofing cement, cement for roads and pavements; cement slabs; cement posts; cement for furnaces; cement for blast furnaces; decorative building products made of cementitious materials, namely, cement mortar tiles, cement posts, statues; concrete; pre-cast concrete products, namely, piles, beams, pipes, tiles; ready mix concrete products, namely, concrete mix; concrete blocks and pipes, pre-cast concrete pipes; concrete building elements, namely, stair-treads, pre-cast concrete wall forms; fireproof cement coatings; reinforcing materials, not of metal, for building such as mortar, stone, lime and plaster; supplementary cementitious materials and their blends for building purposes such as fly ash, blast furnace slag, silica fume and metakoalin; concrete mixes containing high volumes of supplementary cementitious materials