Condition Assessment and Repair/Strengthening of Reinforced Concrete Structures University of Cape Town, Dept. of Civil Engineering
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1 5 CPD Points (1 CPD point per day) 5-days Technical Workshop, July 2015 Condition Assessment and Repair/Strengthening of Reinforced Concrete Structures University of Cape Town, Dept. of Civil Engineering Venue: Transnet School of Rail, Esselen Park, Kempton Park, Johannesburg Introduction The purpose of the workshop is to provide participants with a fundamental and practical understanding on condition assessment of concrete structures and concrete repair and strengthening methods. A large number of concrete structures are deteriorating, often prematurely, and need remedial measures to reinstate their safety and/or serviceability. Consequently, the need for repair and protection has grown considerably in recent years. While costs associated with repair of deteriorating concrete structures can be substantial, costs resulting from poorly designed or executed repairs may be even higher. The technical and economical success of repair projects depends on a range of factors, including a proper condition assessment of the structure, design and execution of remedial measures, and design and implementation of maintenance strategies. For reinforced concrete structures, the main durability problem is corrosion of the reinforcement, resulting from the ingress of chloride ions or carbon dioxide and the subsequent depassivation of the steel. Other causes for concrete deterioration and damage include construction defects, structural loading, chemical attack (ASR, sulphate attack, acid attack) and fire damage. At the beginning of any repair project, a systematic condition assessment of the structure needs to be carried out to identify the cause(s) of deterioration and the extent of damage. The workshop informs about concrete deterioration mechanisms, on-site evaluation techniques, the principles of diagnostic testing (strategies, test methods and interpretation of results), and concrete repair strategies. Repair methods need to be designed with consideration for the anticipated or desired remaining service life of the structure. A distinction must be made between repairs intended to stop deterioration fully and those merely aimed at slowing down deterioration processes for a limited period of time. During the course relevant repair methods for damaged concrete structures are discussed, focussing on design methods, application principles and limitations. The scope of relevant repair methods includes the application of penetrating corrosion inhibitors and surface coatings, temporary electrochemical techniques, cathodic protection systems, bonded overlays (patch repairs), and crack injection. The workshop further covers assessment methods for structural damage, as well as methods and systems for structural strengthening, including FRP system design. The detailed programme is presented on pages 3 and 4. 1
2 Contents and topics - Concrete deterioration processes and damage to concrete structures o Chemical and physical attack o Fire damage o Structural damage o Cracking o Construction defects - Design for concrete durability o Mix design, constituent materials, service life modelling - Reinforcement corrosion o Principles, mechanisms and influences o Carbonation and chloride ingress o Corrosion prevention in new structures - Condition assessment of concrete structures o Planning and strategies for condition assessments o On-site diagnostic testing o Visual assessment methods o Assessing structural capacity o Non-destructive testing methods and interpretation of results o Laboratory-based testing of samples o Prediction of residual service life o Case studies - Repair and rehabilitation of concrete structures o Philosophies and strategies o Repair methods, materials and systems o Repair principles for corrosion damaged structures o Concrete surface protection and coatings o Bonded concrete overlays and patch repair o Repair guidelines according to the Eurocode o Service life extension o Structural repairs and strengthening - Non-destructive testing of concrete structures o Assessment of concrete compressive strength o Concrete cover and rebar location o Crack detection, void detection, honey comb detection o Stiffness assessment o Pile testing - Strengthening of concrete structures o Principles and strategies o Strengthening using steel plates o Strengthening using FRP 2
3 Programme Day 1 (06 July): Durability design, deterioration and condition assessment Introduction, desirable properties of concrete, concrete materials and proportions, durable concrete design and construction 10:30-12:00 Designing for durability: materials, concrete mix design, service life modelling, Durability Index approach, surface coatings, durability enhancers Concrete deterioration mechanisms (cracking, chemical attack, physical attack, ASR, structural damage, construction defects), including discussion on basic repair principles, case studies 15:00-16:30 Concrete deterioration, continued Day 2 (07 July): Deterioration and condition assessment, repair principles Fire damage: mechanisms, condition assessment, damage rating, repair principles, case studies 10:30-12:00 Bonded concrete overlays, material selection, construction methods, performance criteria Damage assessment and diagnostic testing; planning of condition surveys with a view on possible repair options; principles of non-destructive testing 15:00-16:30 Concrete crack repair, principles, materials, systems Day 3 (08 July): Reinforcement corrosion assessment and repair Reinforcement corrosion: principles, mechanisms, service life estimation, prevention of corrosion 10:30-12:00 Reinforcement corrosion: condition assessment and damage rating Repair principles for structures damaged by reinforcement corrosion 15:00-16:30 Repair principles for structures damaged by reinforcement corrosion 3
4 Day 4 (09 July): Non-destructive testing methods 07:30-08:00 Arrival and coffee/tea 08:00-09:30 Overview, assessment of compressive strength of concrete 09:30-10:00 Tea break 10:00-12:00 Concrete cover and rebar location Ultrasonic testing, impact echo and sonic echo tests 15:00-16:30 SASW, Ground penetrating radar Day 5 (10 July): Structural strengthening and FRP systems 07:30-08:00 Arrival and coffee/tea 08:00-09:30 Structural failure and serviceability problems; principles of structural damage assessment and in-situ testing 09:30-10:00 Tea break 10:00-12:00 Structural strengthening: design principles and methods, system and material selection Strengthening structures for flexural and shear capacity; bonded plate systems; external prestressing 15:00-16:30 FRP systems: design principles, system solutions, application methods Note: Registration and attendance at selected days is possible Registration Fees 5-day attendance 1-day attendance (per day) Delegates R R Full-time students R R Registration covers attendance of all sessions, teas and lunches, one set of printed notes, and electronic copies of presentations 4
5 Presenters Professor Pilate Moyo performs research and lectures in the fields of structural engineering and structural condition assessment at the University of Cape Town. He is a member of the Concrete Materials & Structural Integrity Research Unit (CoMSIRU) at UCT, which focuses on infrastructure performance and renewal research. Prof Moyo s specific interests in bridge design are bridge loading and design of footbridges for vibration serviceability. Associate Professor Hans Beushausen is a researcher and lecturer in the fields of structural engineering, construction material technology, structural condition assessment, and concrete repair technology at the University of Cape Town. He is a member of the Concrete Materials & Structural Integrity Research Unit (CoMSIRU) at UCT, which focuses on infrastructure performance and renewal research. His research interests include concrete durability, performance assessment of concrete structures, repair systems for concrete structures, and bonded concrete overlays. Dr. James Mackechnie is based in Christchurch, New Zealand where he works for Allied Concrete and is an adjunct researcher at the University of Canterbury. He was previously at the University of Cape Town involved in concrete durability and concrete repair research. His research expertise is in the broad area of ready mix concrete production, precast concrete and durability of concrete structures, particularly those exposed to severe environmental and/or loading conditions. Dr. Mackechnie has been involved in numerous concrete repair projects in South Africa and New Zealand. Dr. Mike Otieno is a researcher and lecturer in the fields of structural engineering, construction material technology at the University of the Witwatersrand, Johannesburg. His research interests include concrete durability, corrosion of steel in reinforced concrete structures, and alternative materials for making concrete. 5
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