Chemical additives for concrete; Chemical additives for use with concrete; Chemical compositions for hardening concrete; Chemical preparations for the treatment of concrete; Chemical products for use as additives to concrete; Concrete admixtures; Products for protecting concrete (chemicals); Preservatives for concrete (except paints and oils); Concrete preservatives, except paints and oils; Cement waterproofing chemicals (other than paint); Cement-waterproofing chemicals, except paints; Chemical products for use in waterproofing of water courses; Waterproofing preparations (chemical); Repellents for water; Water repellant compositions; Water repellents (chemical)