Structures exposed to chemical environments require special consideration in design and construction because aggressive chemicals can significantly reduce durability, strength, and service life. Chemical attack may arise from industrial effluents, sewage, marine salts, acidic soils, sulphates, chlorides, or polluted atmosphere. The primary objective of design in such environments is to minimize the ingress of harmful agents, ensure material compatibility, and provide adequate protection to structural components. The selection of suitable materials is a fundamental recommendation. Cement used in concrete should be chosen based on the type of chemical exposure. For sulphate-rich environments, sulphate-resisting Portland cement or blended cements such as Portland slag cement and Portland pozzolana cement are preferred. These cements have lower permeability and improved resistance to chemical attack. Aggregates must be chemically inert and free from deleterious substances. Reinforcing steel should conform to standard specifications and may be coated with epoxy or galvanized