Embedded Files
LNEC, Library
About the Course
The concrete swelling reactions (alkali-silica reaction – ASR – and delayed ettringite formation – DEF) can induce significant deformations on structures, sometimes causing serious cracking, equipment misalignment, and even leakage. These reactions also induce a decrease in tensile strength and the elasticity modulus and, in some cases, a reduction in the compressive strength. Dams and hydroelectric plants are particularly vulnerable to these phenomena, as they are fed by the water. In dams, increased long-term damage (cracking) and irreversible crest displacements are observed, potentially affecting stability and spillway gates clearances. In hydroelectric plants, deformations can affect turbines and generators’ clearances and cause damage to the powerhouse superstructure.
This one-day short course will provide owners and practitioners with a concise, rigorous and comprehensive view of the swelling phenomena and current methods for its management in major structures. In particular: a) chemo-physical nature of the reactions; b) diagnosis and prognosis test methods; c) monitoring and analysis, including the main aspects of the finite element modelling; and d) management and rehabilitation of the affected dams.
Participants will receive a comprehensive set of notes, articles and documentation.
Who should attend
Owners, engineers, designers, consultants, contractors and regulators who are faced with having to deal with dams, hydroelectric plants and concrete structures that have been found to be subject to chemical expansion phenomena. The course is intended to provide basis for making engineering decisions on the assessment and management of the concrete structures and affected equipment.
Speakers
António Lopes Batista
Principal Researcher, LNEC
António Lopes Batista is a civil engineer, PhD, principal researcher and head of the Concrete Dams Department of LNEC (Portugal). He developed his professional activity in LNEC since 1986, in the following fields related with concrete and masonry dams: i) analysis and interpretation of the observed behavior, using mathematical modelling; ii) instrumentation, monitoring and inspection; and iii) deterioration and rehabilitation, particularly the concrete dams affected by swelling reactions. He is responsible for the team that monitors the behavior of around 70 large Portuguese concrete and masonry dams. He was also involved in studies of large dams abroad, namely in Mozambique, Angola, Brazil and Peru. He was the chairman of the 16th International Conference on Alkali-Aggregate Reaction in Concrete (ICAAR-2020-2022).
António Santos Silva
Senior Researcher, LNEC
António Santos Silva is a Chemist by Sciences Faculty of University of Lisbon and has a PhD in Civil Engineering by Minho University. He is a Researcher at Laboratório Nacional de Engenharia Civil since 1992 at Materials Department. His main focus is the study of materials, including its characterization and performance. Studies on mitigation of internal expansive reactions in cement-based materials and compatible materials for conservation of historical heritage are also included in its research topics. He has coordinated or participated in several International and National Research Projects related to concrete degradation and conservation of historic buildings and structures. He is the author or co-author of more than 80 papers in international indexed journals. Is a RILEM member since 2009, he currently participates in the committees TC 300-ARM: Alkali-aggregate reaction mitigation and TC301-ASR: Risk assessment of concrete mixture designs with alkali-silica reactive (ASR) aggregates.
Olivier Chulliat Specialist, EDF
Olivier CHULLIAT is a civil engineer, head of EDF Hydro Alpes Safety Department (France). He first worked at EDF-DTG Unit in the field of dam monitoring, then in surveillance methods and instrumentation development, and finally in nuclear power plant monitoring (containment shells and cooling towers) and leakage rate surveillance. He then joined EDF-CIH (Hydro Engineering Center) to carry out diagnostics (studies and reconnaissance) on civil engineering issues, to contribute to safety reviews and to lead dam rehabilitation projects. In particular, he led the studies and rehabilitation work on Chambon dam, a 90 m high concrete gravity dam affected by AAR. He also led the studies for strengthening Choranche dam, a 30 m high arch dam with gravity abutments also subject to concrete swelling, in preparation for work 10 years ago.
João Custódio
Senior Researcher, LNEC
João Custódio is a Chemist, PhD, senior researcher, and head of the Cementitious Materials Unit of the Materials Department of LNEC (Portugal). He graduated in Technological Chemistry from the Faculty of Sciences of Lisbon University (Portugal) in 2002, completed a PhD in Materials Science and Engineering at Oxford Brookes University (United Kingdom) in 2009, and finished a Post-Doctoral Research Programme at LNEC in 2016, focusing on the deterioration of concrete due to internal expansive chemical reactions. Since 2017, he has been a Research Officer at the Cementitious Materials Unit of LNEC’s Materials Department, working mainly on concrete durability, in particular with internal expansive chemical reactions. He has participated in multiple studies on the diagnosis and prognosis of ASR and DEF in large concrete structures, e.g., viaducts, bridges, and dams, both in Portugal and internationally.
Ivo Figueiredo Dias Assistant Researcher, LNEC
Ivo Figueiredo Dias is a civil engineer who graduated from the University of Porto in 2004. He was a Phd student at the International Center for Numerical Methods in Engineering (CIMNE) in Barcelona, and obtained his doctorate from the Polytechnic University of Catalonia in 2012. After completing his PhD, he joined LNEC as a postdoctoral researcher and, since 2018, is Assistant Researcher in the Concrete Dams Department. His current activities focus on research and consultancy projects related to the interpretation of the observed behavior of dams and its safety assessment using numerical models, particularly for structures effected by swelling reactions. He was involved in studies of large dams in Portugal and abroad, namely in Mozambique and Brazil.
Robin Charlwood Specialist, USA
Robin Charlwood (Ph.D., P.E.) is a civil engineer with over 50 years of international experience in design, engineering review, asset management, safety and security assessments and rehabilitation projects for dams and hydroelectric plants.
He is currently focused on two key areas for hydroelectric power and water supply: development of options to improve the long-term management and service life of AAR affected dams and hydroelectric plants; and development of dam safety guidelines for use by developing countries.He is an honorary member of the International Commission on Large Dams (ICOLD). He was the chairman (1997-2015) of the Committee on Concrete Dams, and member since then. The work included, among other activities, the ICOLD Bulletins B126 - Roller-compacted concrete dams, B136 - The specification and quality control of concrete for dams, B145 - The physical properties of hardened conventional concrete in dams, B165 - Selection of Materials for Concrete in Dams, and B184 – Management of Expansive Chemical Reactions in Concrete Dams.
From 1972 to 2004 he worked at Acres International in Niagara Falls, Canada and in the United States. Subsequently, he is the principal of Robin Charlwood & Associates, PLLC, Seattle, USA providing independent consulting engineering services.
He was Project Manager for the investigations and remedial measures at the Mactaquac Generating Station in Canada where wire saw cut techniques were pioneered in 1988 to address ASR. Since then, he has been a consultant on several other ASR investigations and remediation projects in the United States and internationally.
Final Programme
08:30 – 09:00 – Registration
09:00 – 10:30 – General framework of the structural effects of concrete swelling reactions in dams
António Lopes Batista (LNEC, Portugal)
Macroscopic evidence of concrete swelling
Factors influencing concrete swelling
Swelling development over time and associated damage
Monitoring and management
Dams affected worldwide
10:30 – 11:00 – Coffee break
11:00 – 12:30 – Prevention, diagnosis and prognosis of concrete swelling reactions
João Custódio, António Santos Silva (LNEC, Portugal)
Concrete swelling reactions (ASR and DEF)
Prevention of ASR and DEF in new structures (existing frameworks and test methods)
Diagnosis of ASR and DEF in existing structures (laboratory test methods)
Prognosis of ASR and DEF in existing structures (laboratory test methods)
12:30 – 14:00 – Lunch
14:00 – 15:30 – Modelling of concrete swelling effects in dams
Ivo Figueiredo Dias (LNEC, Portugal)
Concrete swelling as a prescribed strain
Influence of creep, temperature, moisture and stress field
Cracking effects
External and internal confinement
Use of the finite element method for analysis
Case study: Covão do Meio dam (Portugal)
15:30 – 16:00 – Coffee break
16:00 – 17:30 – Rehabilitation techniques in dams damaged by concrete swelling
Olivier Chulliat (EDF, France)
Restore the concrete continuity
Concrete replacement
Impervious membranes
Passive and prestressing reinforcement
Slot cuts
Examples of Chambon dam (France) and Pracana dam (Portugal)
17:30 – 18:00 – Discussion of the main issues
Robin Charlwood (Consultant, USA), facilitator
The sessions will last approximately 70 minutes of presentation and approximately 20 minutes of questions/answers.
One-day courses prices:
Public in general - €330
Students - €250
Page updated
Google Sites
Report abuse