Non-metallic building materials; joints of non-metallic materials for use in building and construction; non-metallic ties for use in building; non-metallic floors; concrete floors; concrete walls; ready mixed concrete; sands for use in preparing concrete; concrete slabs; cementitious wall coatings and cementitious floor coatings; mortar; cement mortar; mortar mixtures; castings of plaster for decorative purposes; rapid hardening plaster for building purposes