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Second European Seminar on Failure and Repair of Corroded Reinforced Concrete Structures
Conference reports
International Conference on In-situ/Non-destructive Testing of Concrete, 2-5 October 1984, Ottawa, Canada.
Second European Seminar on Failure and Repair of Corroded Reinforced Concrete Structures, 3 October 1984, London.
In-situ and non-destructive test methods are now widely accepted to have an important role to play in building and civil engineering construction and are almost looked upon as part of the process of design and construction. The Canada Centre for Mineral and Energy Technology (CANMET) has played a significant role in the development and wider usage of such test methods, and it is therefore no surprise that this Conference was organised by CANMET in association with the American Concrete Institute, the National Bureau of Standards and the Canadian Society for Civil Engineering. The organisation of the Conference, the technical papers and the associated social programme were all of high quality, and contributed to its success. The themes of the Conference were organised in sixteen sessions, with some of the sessions inevitably running simultaneously. Over sixty technical presentations were made both as main papers and as research reports. All the well-established NDT methods were discussed With further data and applications. The evaluation and acceptance of concrete quality by in-place testing on two large projects in Toronto seemed to indicate the general acceptance of NDT methods in practical situations. The cost effectiveness of in-situ testing was reported and shown to lead to substantial economies when planned with care and consideration. In-situ permeability tests for both liquids and gases received special attention of the participants. Several new NDT methods were reported - the use of infra red thermography to detect damaged areas in buildings, the detection of surface opening cracks in concrete by surface scanning waves, flaw detection by pulse-echo method, and the application of penetrating radar for evaluation of concrete quality. There were two highlights to the technical discussions - a CANMET film presentation on non-destructive testing of concrete and the presentation of Awards to Rowland J. Kopf, John R. Leslie, Owen Richards and Ernst Schmidt for their outstanding contributions to NDT. The proceedings of the Conference is published as an ACI publication SP-82. Thirty-eight papers covering about 830 pages are included. A paper of particular interest included in the volume is an annotated bibliography on in-situlnon-destructive testing of concrete published over the period 1975-1983. Some 216 papers are included in this bibliography. The proceedings volume will rank as a comprehensive state-of-the-art report and a reference book for some time to come. Copies of the publication SP-82 can be obtained from the American Concrete Institute.
Steel corrosion in reinforced concrete structures has become a major area of concern not merely to researchers and designers but to all those involved in the preservation and maintenance of civil engineering constructions. There have been several conferences and symposia held to discuss the numerous problems associated with steel corrosion. The emphasis of the Second European Seminar is on the failure and repair of corroded reinforced concrete structures, and in particular, on the reasons for the deterioration by corrosion of concrete structures together with the economic aspects of the problem and possible methods of preventing further deterioration. Eight papers are included in the proceedings of this symposium. In the introductory review of the corrosion of reinforcing steel, the importance of electrochemical techniques is emphasized. These techniques can be used not only to characterise concrete in the laboratory but also to monitor corrosion in the field. The economic consequences of structures built in the 1960s and 70s are ably dealt with in the second paper. Lack of supervision, poor design and inadequate detailing have, amongst other factors, magnified the problem in high rise and system buildings in urban areas and resulted in serious economic consequences. In one major city, with over 90,000 housing units, the estimated cost of repairs associated with reinforcement corrosion is about £170M: typical repair costs for some system built houses are about £5000 per house! Three papers deal with corrosion problems in reinforced concrete bridges, in medium and high rise buildings, and in the Gulf region. The causes of corrosion, appropriate repair treatments and their implications to concreting practice and design are extensively discussed in these papers. The last three papers deal with prevention of corrosion and protection methods for concrete structures. The use of organic coatings on steel and concrete, and the application of cathodic protection are reviewed and discussed. Using blended cements can also provide adequate protection and has a major influence on the corrosion behaviour of embedded steel. The papers in the proceedings of this symposium give further useful information on the growing problem of reinforcement steel corrosion, their implications on maintenance costs, preventive techniques and protection of concrete structures. The proceedings can be obtained from Oyez Scientific and Technical Services Ltd, Bath House, 56 Holborn Viaduct, London EC1A 2EX.
281
International Conference on In-situ/Non-destructive Testing of Concrete, 2-5 October 1984, Ottawa, Canada.
Second European Seminar on Failure and Repair of Corroded Reinforced Concrete Structures, 3 October 1984, London.
In-situ and non-destructive test methods are now widely accepted to have an important role to play in building and civil engineering construction and are almost looked upon as part of the process of design and construction. The Canada Centre for Mineral and Energy Technology (CANMET) has played a significant role in the development and wider usage of such test methods, and it is therefore no surprise that this Conference was organised by CANMET in association with the American Concrete Institute, the National Bureau of Standards and the Canadian Society for Civil Engineering. The organisation of the Conference, the technical papers and the associated social programme were all of high quality, and contributed to its success. The themes of the Conference were organised in sixteen sessions, with some of the sessions inevitably running simultaneously. Over sixty technical presentations were made both as main papers and as research reports. All the well-established NDT methods were discussed With further data and applications. The evaluation and acceptance of concrete quality by in-place testing on two large projects in Toronto seemed to indicate the general acceptance of NDT methods in practical situations. The cost effectiveness of in-situ testing was reported and shown to lead to substantial economies when planned with care and consideration. In-situ permeability tests for both liquids and gases received special attention of the participants. Several new NDT methods were reported - the use of infra red thermography to detect damaged areas in buildings, the detection of surface opening cracks in concrete by surface scanning waves, flaw detection by pulse-echo method, and the application of penetrating radar for evaluation of concrete quality. There were two highlights to the technical discussions - a CANMET film presentation on non-destructive testing of concrete and the presentation of Awards to Rowland J. Kopf, John R. Leslie, Owen Richards and Ernst Schmidt for their outstanding contributions to NDT. The proceedings of the Conference is published as an ACI publication SP-82. Thirty-eight papers covering about 830 pages are included. A paper of particular interest included in the volume is an annotated bibliography on in-situlnon-destructive testing of concrete published over the period 1975-1983. Some 216 papers are included in this bibliography. The proceedings volume will rank as a comprehensive state-of-the-art report and a reference book for some time to come. Copies of the publication SP-82 can be obtained from the American Concrete Institute.
Steel corrosion in reinforced concrete structures has become a major area of concern not merely to researchers and designers but to all those involved in the preservation and maintenance of civil engineering constructions. There have been several conferences and symposia held to discuss the numerous problems associated with steel corrosion. The emphasis of the Second European Seminar is on the failure and repair of corroded reinforced concrete structures, and in particular, on the reasons for the deterioration by corrosion of concrete structures together with the economic aspects of the problem and possible methods of preventing further deterioration. Eight papers are included in the proceedings of this symposium. In the introductory review of the corrosion of reinforcing steel, the importance of electrochemical techniques is emphasized. These techniques can be used not only to characterise concrete in the laboratory but also to monitor corrosion in the field. The economic consequences of structures built in the 1960s and 70s are ably dealt with in the second paper. Lack of supervision, poor design and inadequate detailing have, amongst other factors, magnified the problem in high rise and system buildings in urban areas and resulted in serious economic consequences. In one major city, with over 90,000 housing units, the estimated cost of repairs associated with reinforcement corrosion is about £170M: typical repair costs for some system built houses are about £5000 per house! Three papers deal with corrosion problems in reinforced concrete bridges, in medium and high rise buildings, and in the Gulf region. The causes of corrosion, appropriate repair treatments and their implications to concreting practice and design are extensively discussed in these papers. The last three papers deal with prevention of corrosion and protection methods for concrete structures. The use of organic coatings on steel and concrete, and the application of cathodic protection are reviewed and discussed. Using blended cements can also provide adequate protection and has a major influence on the corrosion behaviour of embedded steel. The papers in the proceedings of this symposium give further useful information on the growing problem of reinforcement steel corrosion, their implications on maintenance costs, preventive techniques and protection of concrete structures. The proceedings can be obtained from Oyez Scientific and Technical Services Ltd, Bath House, 56 Holborn Viaduct, London EC1A 2EX.
281