Concrete Repair, Rehabilitation and Retrofitting

Professor Mark G Alexander, Department of Civil Engineering, University of Cape Town, South Africa Dr Hans-Dieter Beushausen, Department of Civil Engineering, University of Cape Town, South Africa Dr Frank Dehn, MFPA Leipzig, Germany   Dr Pilate Moyo, Department of Civil Engineering,University of Cape Town, South Africa

Keynote papers




Infrastructure asset preservation: Is it a façade
Concrete repair according to the new European Standard EN 1504
Concrete repair – a composite system: Philosophy, engineering and practice
Design of concrete to meet durability requirements; Development towards a performance specification in South Africa
Potential and limits of durability design
Repairs by the thin bonded overlay technique: The RILEM TC 193-RLS and last findings about the debonding mechanism
Bonded concrete overlays – bond strength issues
Structural rehabilitations with Ultra-High Performance Fibre Reinforced Concretes (UHPFRC)
Developments in rehabilitation and consolidation of historical concrete and masonry constructions
Use of new concrete materials for durable structures





Theme 1: Concrete durability aspects Causes and mechanisms of deterioration




Latest insights and advances in understanding the ASR
Acid attack of self compacting concrete
Reaction mechanisms and thermodynamic modelling of Thaumasite Sulfate Attack (TSA); experimental modelling
Performance of concrete exposed to freezing and thawing in different saline environments
Frost salt scaling modeling of cement paste





Innovative materials and influences of material composition




Surface protection systems on concrete: Investigations on durability and efficiency
Effect of rubber aggregate incorporation on the resistance of cement-based mortar to shrinkage cracking
Pore fluid analysis of cement mortar exposed to a chloride environment
Resistance of concrete sewer coatings to chemical and biogenic attacks
Construction of ferrocement water storage tanks and their comparison with R.C.C. and fiberglass tanks
Research of fresh concrete treatment against desorption by means of polymers
Durability of polymer modified concrete in marine environment
Calcium aluminate cements for repair applications
Durability of concretes with ferrous dusts exposed to liquid chemically aggressive environments
Flexural behaviours of reinforced concrete member strengthened tension zone with reactive powder composite material
Use of accelerated tests for evaluating the effectiveness of fly ash and ternary cementitious systems to control alkali-silica reactivity in concrete
Mechanochemical synthesis of mullite and mullite-silicon carbide from secondary mineral resources used as an aggregate for fireproof concretes
Prognostic models for creating new composite fireproof concretes and masses from secondary mineral resources
Conception for creating superfireproof composite concretes and masses from secondary mineral resources
Reduced carbonation of concrete by paraffin-wax
Outdoor exposure of polymer-impregnated concrete (PIC) permanent form in Saudi Arabia
Sustainability of polymer-impregnated concrete panel as permanent form
Steel fibre reinforced SCC – a durable and robust construction material
Research of aerated self compacting concrete problems
Carbon fibre composites for a new generation of tendons
Use of stainless steel for durable concrete structures
Corrosion protection of reinforcement for concrete structures
Synergic effect against corrosion between galvanized steel rebars and hydrophobic concrete
Corrosion of RC columns repaired and wrapped with CFRP sheets
Selected aspects of interaction of laser radiation with concrete surfaces


Service life modelling and prediction of durability




Practical implementation of a reliability-based concrete durability design
A numerical model for durability predictions
Service life prediction, re-evaluation and optimum repair strategy
Maintenance strategy versus simplified deem-to-satisfy rules
Software for probability-based durability analysis of concrete structures
Models for environmental actions for reinforced concrete structures in marine and road environments
Modeling of temperature behavior of concrete during hydration
Design of concrete structures for durable fire resistance
Predicting chloride content profile in concrete using a concrete mix design parameter
Modelling moisture and salt penetration in concrete
Effect of duration and conditions of exposure on chloride diffusion
Durability indexes and their use in corrosion rate prediction, with influence of binder type





Theme 2: Condition assessment of concrete structures Corrosion assessment and service life aspects




Structural assessment methodology for residual life calculation of corroding concrete structures
A rapid technique for detecting corrosion of steel in reinforced concrete
Determination of corrosion related values for reinforced concrete structures
Durability based design of RC structures in Persian Gulf region using DuraPGulf model
Remaining service-life predictions: Experiences of Dutch investigations
Influence of unsteady external environment on corrosion rate in reinforced concrete
Assessment of reinforcement corrosion in a concrete highway tunnel
Deterioration rate of concrete bridges in South Africa
NDE/NDT and measurement techniques
RILEM TC 189-NEC (Non-destructive evaluation of the concrete cover): Objective and status quo
Non-destructive techniques for the condition assessment of railway bridges
Monitoring the moisture distribution in concrete structures
Nondestructive evaluation of concrete cover layer adequacy for corrosion protection
Application of X-ray tomography for the verification of damage mechanisms in concrete
Study of the assessment of defects in tunnel using an infrared thermographic technique
Impact-echo techniques for non-destructive inspection of concrete structures
Sensitivity of a non-destructive vacuum test method to characterize concrete permeability
Air permeability measurements for the assessment of the in situ permeability of cover concrete
Applicability of single-chamber vacuum cell for the evaluation of the air-permeability of concrete walls
Effect of aging related to the freeze/thaw and deicing salt resistance of concretes
A novel method to measure moisture profiles in concrete structures
In situ moisture state of coastal concrete bridges
Non-destructive evaluation of fire affected RC structure
Bearing test methods for determining the residual load carrying capacity of rigid concrete pavement constructions before rehabilitation
Chloride and sulphate content in concrete with Laser-Induced Breakdown Spectroscopy (LIBS)
Assessment of foundation slabs with US-echo in the re-use process
Consultant activity leading to improved technical prescriptions (NDT)
Sample size of rebound method for the determination of concrete strength
Shearography – a novel non-destructive testing technique for concrete strength appraisal
Galvanostatic pulse corrosion measurements on a recent thermal swimming pool containing seawater
Monitoring cementitious materials during setting and hardening with an ultrasonic shear wave reflection method
Digital image analysis of cracks in concrete of different grades





Materials and structural assessments




Evaluation of repair systems – basic principles
Finite element analysis of RC beams retrofitted with steel plates
Material and structural assessment of fire damage to the concrete deck of a motorway bridge
The problem of evaluation of a three storey RC building for restoration, strengthening and vertical extension
Simplified equation for the dynamic rigidity of RC beams
Structural evaluation and rehabilitation of concrete arches in the Progreso pier
Effects of strength degradations on seismic performance of RC buildings
Seismic performance and damage level of RC buildings in urban area close to epicenter
Experiments on flexural strengthened RC beams by CFRP sheets
Creep and temperature effects on RC lining support slabs in multi flue chimneys





Case studies and surveys




Rehabilitation of a grain concrete silo constructed by slip form method
Rehabilitation of five major bridges on the Garden Route in South Africa
Rehabilitation of hydraulic structures in tropical climates: A case study
Repair of piles in Port of Dar es Salaam
Initial survey of concrete structures in Swedish harbours – a case study in the Port of Trelleborg
Damage assessment of a RC bridge structure showing damages at the prestressing steel
Damage assessment of a RC tunnel structure showing delaminations
Condition assessment of concrete bridges in Sweden
Condition assessment of a turbo-generator foundation concrete structure
High rise concrete façade defects: Causes and remedies
Structural diagnosis and repair of fire damaged industrial structure
The bridges of Timisoara – struggling throughout the time
Repair and widening of the Carlisle Bridge
Type of effects and extent of corrosive attack on cooling towers, rehabilitation and their service life





Theme 3: Concrete repair, rehabilitation and retrofitting - Design procedures and specifications




Manual REHABCON on concrete repair and rehabilitation
Manual on rehabilitation of concrete structures: REHABILITAR Network XV.F from the Iberoamerican Program for Science and Technology (CYTED)
Evaluation of best repair option through the repair index method, RIM
A client’s perspective on the implementation of rehabilitation procedures and durability specifications for structures on national roads in South Africa
Securing a maintenance-free service life for concrete-silos





Repair methods and techniques




Integrated protection system for chloride deteriorated concrete structures
Rehabilitation of spherical bridge bearings on Foreshore Freeways Bridges, Cape Town
10 years experience with repair of a coastal concrete bridge
Microbial ureolytic calcium carbonate precipitation for remediation of concrete surfaces
Primers for the reinforcement as a repair method of concrete in columns of buildings exposed at a tropical marine environment. Influence of adjacent zones
Injection into cracks in concrete made with reactive aggregates
Cathodic protection of the historic rail bridge over the Silvermine River
Cathodic protection of reinforced concrete – a system with woven carbon mesh
The use of penetrating corrosion inhibitors as a treatment for structures corroding due to chloride ingress
Concrete repair strategies including surface-applied corrosion inhibitors
Performance of an organic corrosion inhibitor in concrete affected by both chloride and carbonation-induced corrosion
Significance of the concentration of chloride in the repair of concrete highway structures using surface applied corrosion inhibitors
Repair of the Pungwe Bridge in Mozambique
Repair and rehabilitation of a prestressed deck bridge (case study)
Shotcrete for rehabilitation of fire affected building
Rehabilitation of 50 bridges in and around Port Elizabeth on the N2
Use of two-stage (pre-placed aggregate) concrete in construction and repair of concrete structures
Repair of historical concrete structures and monuments





Repair materials and systems




Investigations on durability behaviour of concrete repair systems exposed to outdoor weathering
Rehabilitation of concrete pavements with geotextiles and steel meshes
Effect of admixtures on the fresh and hardened properties of modern rendering systems
Behavior of cement-based patch repair materials in plain and reinforced concrete members
Ultrasound monitoring of setting and hardening of shotcrete including alkali-rich or alkali-free accelerators
The effect of silica fume and polymer on properties of repair concrete in simulated conditions of the Persian Gulf
Effectiveness of surface coatings on limiting the ingress of chlorides into the barrier wall of the Confederation Bridge
Flexible polymer-cement repair materials and their applications
Properties of polymer-modified mortars with hydrocalumite for intelligent repair materials
Aqueous polymers for the construction industry
Rapid polymer concrete repairs using available fillers
Polymers in concrete for repair: Where have we been and where are we going?
Development of repair materials based on calcium sulfo-aluminate cement
Modification of mortars and concrete by polymer dispersions based on saccharides
Repair mortar colour matching by colourimetric method
Modification of epoxy repair materials with waste fillers
Characterization of the durability and service life evaluation of repair mortars for concrete elements
Development of genetically engineered biosealant for crack remediation





Bonded concrete overlays




Roadmap for improvement of crack resistance of repair materials
On the compatibility measure in the repair systems
Rehabilitation strategies and material performance of SCC used for the repair of the Jarry/Querbes underpass in Montreal
Two different techniques for the evaluation of concrete surface roughness
Relationship between surface characteristics and superficial cohesion of concrete
Effect of surface preparation techniques on the cohesion of superficial concrete: Comparison of jack-hammering and water jetting
Innovative non-destructive assessment of adherence failure of the top layer in an industrial floor
Effects of repeated loading on the shear connection between old and new concrete
Development of test method for cracking tendency of repair materials
Crack development in bonded concrete overlays subjected to differential shrinkage: A parameter study
Efficient testing of fibers with the Baenziger Block
Survey on Swedish practice for bonded overlays and patch repair
Bridge renewal under traffic load
Microstructure, chloride migration and corrosion near the transition zone between substrate and repair concrete





Structural repairs and strengthening




Textile reinforced concrete with AR-glass-fibre-multifilament yarn – a new innovative compound material for concrete repair and rehabilitation
Strengthening RC beams by external reinforcement
Flexural strengthening of RC beams via external prestressing
Liesbeek Parkway bridge widening
Characterizing old reinforced-concrete structures for compliance with new standard requirements
Bond behaviour of post-installed rebars under one-directional and reversed cyclic loading
Partial versus full wrapping confinement systems for concrete columns
Strengthening of concrete masts using multi-axial AR-glass structures
Experiment on shear resistance of RC wall-frame structures strengthened with CF-grids
Shear strength of retrofitted reinforced concrete sections
Performance evaluation of retrofitted dry-stack block masonry structure
A unique strengthening solution for the Agter Paarl Road Bridge
Bond behaviour and design of post-installed rebar connections





Seismic retrofit and rehabilitation




Seismic retrofit strategy for under-designed reinforced concrete frame systems and subassemblies using FRP composites
Seismic assessment and repair of corrosion-damaged reinforced concrete structures in New Zealand
Seismic rehabilitation: A case study
Experimental tests on seismic retrofit of RC columns
Seismic strengthening techniques for existing RC Structures
Structural retrofitting of buildings affected by earthquake in India with intensity of 7.7 on Richter scale
A performance assessment of a RC frame building using a record obtained at its foundation





Retrofitting techniques and FRP systems




Alternative analytical modelling of retrofitted reinforced concrete members
Textile structures for shear strengthening
Some results from the experiments of flexural strengthened RC beams by CFRP sheets
Shear-flexure interaction of RC elements strengthened with FRP sheets
Mineral based bonding of CFRP to strengthen concrete structures
End anchors’ effect on the behavior of CFRP strengthened beams – experimental investigation
Interaction between FRP shear strengthening and transverse steel reinforcement in RC beams
Debonding of externally bonded CFRP at low and high temperatures
Behavior of square concrete columns strengthened with Carbon Fiber Reinforced Polymer (CFRP) strips
An empirical approach for the determination of ultimate FRP strain in FRP-strengthened concrete beams
A novel Carbon Fiber Reinforced Polymer (CFRP) system for post-strengthening
The behaviour of RC beams retrofitted with CARDIFRC after thermal cycling


Theme 4: Performance monitoring and health assessment




Seismic performance evaluation of prestressed bridges constructed by cantilever method using displacement based approach
Condition assessment of bridges in South Africa: Challenges and opportunities
The use of nanotechnology in concrete structures for durability and health monitoring
Non-destructive assessment of repair efficiency with impact-echo and ultrasonic methods – an overview
Wireless monitoring of concrete structures using Micro-Electro-Mechanical Sensors (MEMS)
Non destructive bridge supervision – traffic and dynamic influences
Damage and condition assessment of R.C. structures for rehabilitation by linear polarization (N.D.T.)
Acoustic emission monitoring and numerical modeling of a FRP-strengthened concrete structure
The influence of synergistic effects of cyclic freeze-thaw, deicing-salt attack and bending stress on behavior of reinforced concrete
Embeddable reference sensors for corrosion monitoring in concrete structures
Full scale load testing of 3 bridges in Mozambique for rehabilitation