【正文】 chedules to review where we are and where we might be going. Of course, there are some thoughts in this paper which may lead others to agree or disagree. But it is only when ideas receive a forum that progress can be made, and that is the goal of this paper. It is not possible here to provide a critical review of numerous aspects of corrosion and corrosion protection, the problems are too extensive and various mechanisms too plicated for a critical discussion in a single paper. General aspects of steel corrosion in concrete and its protection have been treated by a number of authors and will not be addressed here. Research has substantially improved our knowledge of cementitious materials, the fundamentals of concrete deterioration from carbonationinduced corrosion, chlorideinduced corrosion, sulphate attack, alkali–aggregate reaction, frost, etc. However, in view of the serious and 7 insidious nature of the corrosion of steel in concrete repair and repair failures, it is surprising that progress in the repair industry has been so slow, which is probably attributable to some bination of the following: the exterior and interior environments and their interaction. problems does not exist. The mechanism of passivation and corrosion of steel in a plex repair environment is poorly understood. The whole area concerning “additional protection” of reinforcement in repair is currently highly speculative. is an extremely plex phenomenon involving environmental, metallurgical, interfacial, and continuum considerations. Most of the research in this area is being done by the civil engineering departments of universities where few workers have adequate knowledge of the subject. in support of research leading to a resolution to problems. Real progress cannot be made on the basis of graduate students working for limited periods. It is necessary to initiate programs which include a balanced practical approach and are adequately funded. by using high performance materials, corrosion inhibitors, protective coatings, etc., or belt and suspender systems. This caused many workers in the field to ignore the basics in the technology of concrete and other cementbased materials. ficant knowledge to design durable repairs already exists in a relatively “quite refined state”, as stated by Mather [1]. But the manner in which this knowledge is used is primitive. Several research studies in the repair field have been concerned with the improvement of properties of repair materials and their dimensional behaviour relative to the existing substrate. But these activities will lead to improvements in repair durability only if the issues of electrochemical patibility are also addressed. Removal of deteriorated concrete and its replacement with a repair material, even the best one, may result in accelerated rebar corrosion due to macrocell formation. The subject of this paper is also devoted to several confusing issues and attempts to establish the facts concerning the protection of reinforcement from premature corrosion in concrete repair, particularly that offered by corrosion inhibitors. How can we expect repaired concrete structures to be durable if the testing 8 methods, design and specification of corrosion protection methods, are relying on an inadequate assumption that electrochemistry in a repair system is similar to that occurring in new construction? There are significant differences between new construction and repair jobs。 any field where education and research are inadequate is going to have great trouble getting rid of the prevailing misconceptions. The author realizes that some statements will not be shared by many since it hits at the crux of the controversy. But in this case, much more than a hair, perhaps, divides concepts from misconcepts. 2. A glimpse of corrosion problem According to published data, steel reinforcement in concrete and in concretelike materials is, in general, well protected from corrosion by the alkaline nature of the cementitious matrix surrounding it. In general, this is true, it is protected, and it is not supposed to corrode. But such concrete in general may only exist as labcrete, in a small specimen. In the real world, reinforcing and prestressing steels are subject to corrosion due to carbonation and chloride ion attack. Steel reinforcement in concrete does not corrode because the surface of the steel in the alkaline environment is passivated。 that is irrelevant. What it means is that questions raised are not unsolvable mysteries but simply a proof that we are still in the grouping, study stage. After all as Benjamin Franklin stated, “Well done is better than well said!” References [1] Mather B. Realizing the potential of concrete as a construction material. In: Proceedings of the International Conference. Sheffield, England, 1999, pp. 14 1–10. [2] Alekseyev SN, Rozental NK. Resistance of reinforced concrete in industrial environment (in Russian). Strogisdat, Moscow: 1976. [3] Bentur A, Diamond S, Berke NS. Steel corrosion in amp。 1997. 201 pp. [4] Emmons PH, Vaysburd AM. Protection of reinforcement in concrete repair: myth and reality. Concr Int 1997。(September/October):10–3. [6] Moskvin VM, Alexev SN. Beton i Zhelezobeton 1957。423:27. [8] Gaig RJ, Wood LE. of Corrosion Inhibitors and their on the physical properties of Portland cement mortars. Highway Research Record 1970。48(3):154–62. [10] Ramachandran VS, editor. Properties, science and admixtures handbook. Noyes Publicatio