7th International Materials Specialty
Professor at Department of Civil Engineering, University of New Brunswick
Achieving 100-Year Design Life for Reinforced Concrete in Aggressive Marine Conditions, June 14th 2018 9:15am
Corrosion of steel in concrete is the predominant cause of premature failure of reinforced concrete worldwide. However, today it is possible to produce concrete that is extremely resistant to the penetration of chlorides from deicing salts or seawater by the proper selection and proportioning of materials, the adoption of suitable curing and construction practices, the implementation of appropriate performance and quality control tests, and the use of applicable predictive models. Recent developments in these areas are discussed in the context of the Confederation Bridge linking Prince Edward Island with New Brunswick.
Dr. Thomas has been working in the field of cement and concrete research since 1983. Prior to joining UNB in 2002 he had been on faculty at the University of Toronto since 1994 and previous to this he worked as concrete materials engineer with Ontario Hydro in Canada (1991-93) and as a research fellow with the Building Research Establishment in the UK (1986-1991). Dr. Thomas’s main research interests are concrete durability and the use of industrial by-products including pozzolans and slag. His studies on durability have included alkali-silica reaction, delayed ettringite formation, sulfate attack, deicer-salt scaling, carbonation, chloride ingress and embedded steel corrosion. He is also active in the area of service-life modeling, and in the repair and maintenance of concrete structures. He has authored more than 200 technical papers and reports on these subjects, including the book “Supplementary Cementing Materials in Concrete”; he is also a co-author of the service-life model, Life-365.
Senior Research Associate, Geotechnical and Materials Engineering Director of the Northeast Center of Excellence for Pavement Technology, Pennsylvania State University
A Look into Thin Asphalt as a Tool for Pavement Preservation, June 14th 2018 2:00pm
Thin asphalt overlay (TAO) is a generic term and refers to asphalt overlays with thickness less than 38 mm. A common name used by some agencies, referring to these thin mixes, is “bonded wearing course” or “ultrathin bonded wearing course”. Asphalt overlays have been placed as thin as 12 to 19 mm. For thickness of 25 mm and less, maximum aggregate size should be limited to 6.3 mm or 4.75 mm depending on the thickness. As the aggregate becomes finer, developing a high level of macrotexture for skid resistance becomes more challenging. For this reason, use of high quality aggregate with high skid resistance is essential for thin asphalt as high skid resistance of such aggregate delivers a large enough microtexture to partially compensate for the reduced macrotecture of the pavement.
Thin asphalt overlay does not enhance the structural capacity of the pavement significantly. Rather, it preserves the existing pavement, extends pavement life, delays pavement deterioration, and improves cross-slope drainage. There is a consensus among industry experts that preserving pavements through a sound preventive maintenance technique and before major rehabilitation is needed results in major cost savings. TAO is applicable to both asphalt and concrete pavements. In general, an effective TAO is expected to provide a smooth riding surface with sufficient skid resistance. TAO can sometimes be used in situations for which other maintenance and pavement preservation surface treatments cannot correct the pavement surface irregularities. While other treatments may also increase pavement surface friction, TAO is typically better able in improving pavement ride quality with compared other low-cost treatments.
Prior to his role at Pennsylvania State University, Dr. Solaimanian served as director of the transportation infrastructure program at the Larson Institute, where he coordinated the activities of the program and its faculty, staff, students, and resources. Dr. Solaimanian has over 25 years of experience in conducting research and training and has authored over 150 technical publications on research projects. Through his career, he has been principal investigator or co-principal investigator on projects with total funds exceeding $8 million.
Professor, Department of Civil and Mineral Engineering, University of Toronto
Seismic upgrade of concrete structures with external FRP, June 15th 2018 9:15am
Many older structures need retrofitting to meet the requirements of revised design Codes especially for seismic resistance. Furthermore, deterioration of structures due to the corrosion of steel has become a major liability that needs innovative solutions. Two of the major deficiencies deal with reinforced concrete columns and shear deficient structural components. Structures with such components may be at risk of brittle collapse during an earthquake. Use of externally bonded fibre reinforced polymers (FRP) has the potential to be the most economical and technically sound technique to upgrade structures in many situations compared with the traditional methods. FRPs are generally very efficient where high tensile stresses are needed at large deformations. In an extensive research program at the University of Toronto over the last two decades, a number of applications of FRP have been investigated to upgrade structures. Investigation on column upgrade included testing of full size columns under realistic displacement controlled loads simulating earthquakes until their complete destruction to evaluate the failure mechanism and investigate the complete response. A number of variables were studied such as column shapes (circular and rectangular cross sections), types of FRP (glass and carbon), load combinations (axial, shear and flexural) and the level of ductile performance needed. Analytical model to simulate column response and design procedures were also developed. One of the procedures for the design of FRP confinement has been included in the Canadian Code CSA S806-12, “Design and construction of building structures with fibre-reinforced polymers”. To investigate the use of FRP for shear upgrade, a scale model of two storey frame and 15 full scale shear-deficient beams were tested under simulated seismic loading. Carbon FRP was used to upgrade the beams such that shear failure can be suppressed and the beam can deform and dissipate energy in flexure. An analytical model to simulate the response of a beam under shear was developed and can be used for the design of FRP retrofit. FRP retrofits were found to be highly effective at improving performance of deficient structures. In many cases the cost of FRP retrofit can be substantially lower compared with the traditional techniques and repair would be significantly more durable.
Before joining Toronto in 1989, Professor Sheikh was on the faculty of University of Houston for over nine years. He has made outstanding contributions to engineering education, research and practice that are recognized worldwide. His research interests are in the areas of seismic behaviour of concrete structures, development of new materials, analytical models and rational design procedures for concrete structures to withstand the impacts of extreme loads and environment, innovative techniques for life extension of structures and application of research to create sustainable infrastructure. He has authored over 160 journal and conference papers and a U.S. patent. His research has also had significant impact on design codes around the world. He has served as Chair or member of several technical committees of organizations such as ACI, ASCE, CSCE, CSA and PEO. Currently, he chairs the Canadian Highway Bridge Design Code committee on Structures with FRP.
McAsphalt Industries Limited, Toronto, ON
Effect of Asphalt Binder on the Long-Term Pavement Performance, June 16th 2018 9:15am
Canadian highways are vulnerable to impacts of climate change, including more frequent cycles of both wetting and drying, and freezing and thawing. These climate impacts coupled with continued increases in truck traffic can cause more severe and premature pavement failures. In this presentation, Dr. Varamini will explain how such negative impacts can be mitigated to a certain level by use of engineered bituminous binders. Furthermore, Dr. Varamini will explain “balanced method of mix design” and “performance-based” specification should be adopted by Canadian road agencies to ensure a durable and safe transportation infrastructure.
Dr. Sina Varamini is a research and development manager at McAsphalt Industries. Dr. Varamini is responsible for development, optimization, and implementation of products and processes pertained to road construction and maintenance across Canada and the United States. In addition to his current position at McAsphalt, Dr. Varamini is an adjunct assistant professor at the University of Waterloo working under supervision of Professor Susan Tighe. His role includes assisting graduate students from developing research proposals and methodologies to industrial implementation. Dr. Varamini holds a Bachelor’s and Master’s degree in Civil Engineering from Dalhousie University in Halifax, and a PhD in Civil Engineering from the University of Waterloo.
Co-chairs: Xiomara Sanchez and Shahria Alam
The conference will focus on the advances in materials that extend the service life of the infrastructure, reduce maintenance and ensure resiliency, safety, and sustainability. The conference will explore developments in the recycling and reuse of waste materials; the properties and performance of alternative construction materials; improvements in the design, manufacturing, placement and testing of conventional materials including but not limited to steel, Portland cement concrete, asphalt concrete, and aggregates. The conference will also explore the applications of nanotechnology to infrastructure materials. See below a list of expected topics:
- High Performance and High Strength Materials
- Innovative and Emerging Materials
- Properties and Performance of Repair Materials
- Recycle and Reuse of Waste Materials
- Concrete Durability
- Reinforcement Corrosion
- Pervious Concrete
- Bituminous, Pavement and Geotechnical Materials
- Performance of Materials under Extreme Loads and Environmental Demands
- Advanced Composite Materials
- Fiber Reinforced Concrete
- Self-consolidating Concrete
- Novel techniques for the Study and Quality Assessment of Materials
- Aggregate Reactions
Honorary Chair – John Bliss, P.Eng.
CSCE National – Lois Arkwright