INNOVATION OF MATERIALS - STAINLESS STEEL IN CONCRETE STRUCTURES

摘要

Stainless steel has an excellent long-time resistivity in natural environments and incontact with wet construction materials. In civil engineering it is primarily used for corrosionendangered beating construction elements. This paper summarizes the state of the art in theapplication of stainless steel in reinforcement concrete as well the prestressed concretestructures. Fabrication and application of stainless steel in civil engineering has been undergoingdevelopment for many years. Today this material is available in different alloy compositionsand adapted for the corrosive environments in different degrees. The experiences of theapplications of stainless steel reinforcement are positive. It has a much higher corrosionresistance against chloride attack and can withstand much higher chloride contents comparedto the normal carbon steel. The current concern of research is the application of high-strength stainless steel as tensiletendons in prestressed concrete structures. The majority of high-strength stainless steelproducts in building material market are cold-drawn austenitic steels,which have been usedextensively as ropes and cables for bridges,towers and the wide-spanned constructions. Pre-stressed concrete structures are normally applied in wide-spanned constructions,e.g. bridges,multi-storey car park decks,tunnels and so on. These constructions usually are exposed to theaggressive environments (heavy loads,carbonation of concrete and high chlorideconcentration,etc.). The costs of maintenance and repairs of such kind of constructions arevery high according the present experiences. Thus,the application of cold-drawn high-strength stainless steels as prestressing tendons in concrete is not only technically practicablebut also an economical approach.