Materials and products for the construction, maintenance, repair and renovation of buildings, work of art, roads and other travel and circulation tracks and surfaces and for all public works, namely, building materials in the nature of fly ash, cements, namely, silica fume cements, blast furnace cements, white portland cement, drilling cements, aluminous cements, fibre-reinforced cements, mortars, plasters, concretes, sands, fine gravel, gravels, sand and gravel mixtures, dry stone revetments, gypsum, sandstone, bituminous coatings and binding agents for road construction; Concrete, cement and reinforced plasterboards; complex and sandwiched boards made of plaster, polystyrene and vegetable fibers for building. Coatings in the nature of building materials, namely, filling, leveling, pointing, finishing cement and plasters

Construction, repair, maintenance, restoration and renovation of buildings, roads and bridges; Quarrying services; mining extraction