Professor Qing Wang
Director of Institute of Nano engineering , College of Civil Engineering and Architecture，Shandong University of Science and Technology
Title: Study on Flexible Intelligent Sensing Materials for Structural Damage Monitoring
Abstract:Structural health monitoring technology has gradually become an important mean of civil engineering infrastructure management and maintenance. Long-term monitoring of the structure can provide early warning of the structure health, and improve the reliability and service life of the structure by repairing damaged parts, which is of great practical significance to avoid the occurrence of major construction accidents. With excellent sensitivity, durability, mechanical flexibility and other advantages, flexible film damage monitoring smart sensor materials provide a new direction for structural health monitoring.
In this talk, the performance of the polymer substrate of the flexible film smart sensing material for damage monitoring was first investigated experimentally. By adjusting the preparation parameters of the polymer substrate, the thickness of the polymer film was analyzed. And the tensile mechanical properties were tested to study the effect of preparation parameters on the tensile properties of polymer substrates. Through experimental exploration, it was found that the selected polymer substrate has excellent light permeability and good self-cleaning performance, which laid the foundation for the preparation and research of flexible sensing materials.
Professor Dr Hui-Ming Wee
Adjunct Chair Professor, Department of Industrial and Systems Engineering; Distinguished professor and Former Associate Dean, College of Electrical Engineering & Computer Science, Chung Yuan Christian University
Title: Environmental friendly construction material from hydroelectric power plants
Abstract:In the process of producing hydroelectricity, plants all over the world are faced with the problem of reservoir sediment. If this sediment is removed but not properly disposed of, it can become a secondary pollutant. This study proposes a way to resolve this problem through reuse and recycling. In this talk, we discuss a Design for Six Sigma (DFSS) process where reservoir sediment and the masonry waste from the construction industry are combined with cement and a curing agent. The resulting mixture is then transformed into a high strength, non-sintered cured brick after 28 days of natural curing. This product is a new walling material that is friendly to environment, fulfil the goal of energy conservation, waste recycle, protect ecosystems, and promote sustainable development. Large scale recycling of reservoir sediment solves the problems that reservoir sediment poses, as well as increasing the capacity of reservoirs and the effectiveness of hydroelectric power plants. The green milestone reached by the technology is of great industrial, economic and social significance.
Professor Togay Ozbakkaloglu
Ingram School of Engineering, Texas State University
Title: Sustainable composite structural systems incorporating bio- and waste-based materials
Abstract:It is now widely recognized that the conventional construction practices need significant improvements to be able to deliver sustainable urban development. Recent research has shown that the environmental impact and carbon footprint of structures can be significantly reduced through the use of: i) more ecologically advantageous construction materials and ii) better designed structural systems. This talk will focus on one of the most promising of these structural systems, the so-called concrete-filled fiber reinforced polymer (FRP) tube system, where the concrete is filled into a prefabricated FRP tube to form a composite member that maximizes the advantages offered by both materials. The behavior of these composite members under different loading conditions will be presented. The development of next-generation high-performance, low-impact structural systems incorporating i) green composite tubes manufactured with natural or recycled plastic fibers and bio-based resins and ii) eco-efficient, waste-based concretes developed using recycled aggregate concrete and geopolymer technologies will also be discussed.
Professor Faiz Uddin Ahmed Shaikh
Associate Professor, School of Civil and Mechanical Engineering, Curtin University
Title: Effect of nano calcium carbonate on compressive strength development and durability properties of high volume slag and slag-fly ash blended concretes
Abstract: This paper presents the effect of nano-CaCO3 (NC) on the compressive strengths and durability properties of high volume slag (HVS) and high volume slag-fly ash (HVS-FA) blended concretes. The study examined the improvement in early and later age compressive strengths and durability properties such as sorptivity, volume of permeable voids, rapid chloride penetration and drying shrinkage of HVS concrete containing 69% blast furnace slag (BFS) and HVS-FA concrete containing combined BFS and fly ash (FA) content of 69% due to the addition of 1% NC. Results show that the addition of 1% NC improved the compressive strengths of HVS and HVS-FA concretes significantly by 43% and 28%, respectively at 3 days compared to the control HVS and HVS-FA concretes without NC and exceeded the compressive strengths of control OPC concrete at later ages. It is also found that 1% NC inclusion reduced the water sorptivity of HVS and HVS-FA concretes reasonably after 28 days of curing and reduction is greater after 90 days of curing exhibited comparable water sorptivity to OPC concrete. Significant improvement is also observed in reducing the volume of permeable voids and controlling the drying shrinkage strain at early age as well as later ages of both HVS and HVS-FA concretes due to 1% NC inclusion. Outstanding resistance against chloride ion penetration is also observed in HVS and HVS-FA concretes due to addition of 1% NC to the very low level of chloride ion penetration according to ASTM standard. SEM and EDS analysis revealed a denser microstructure of paste and interfacial transition zone (ITZ) around aggregates.
Professor Mohamed Abdel Kader El Gelany Ismail
Department of Civil Engineering, Miami College of Henan University
Title: Recycled waste materials in reinforced concrete construction: developing research and wealth prospects
Abstract:This talk discusses different types of industrial, agricultural and/or natural wastes; some have been already utilized in the concrete industry while many others demonstrate promise for future use. Recycling of those waste materials, found in abundance, not only wards off deleterious environmental hazards, but also have been known to actually produce wealth by adding value through ecology. We will cover different aspects of each proposed material like physical and chemical properties, microstructural analysis and many more.
The presented study compiles information about an extensive variety of wastes thatcould be used in the concrete industry to generate low cost environmentalfriendly materials. Moreover, it will reveal a combination of thesewastes, new approaches to old materials and unique demands related to wastematerials.
The results presented in this talk are not only beneficial botheconomically and environmentally, they also provide the concrete industrywith technical information about valuable resources which play a key rolein meeting the challenges of sustainable construction in today’s world. Thehigh demand of natural resources due to rapid urbanization and the disposalproblem of industrial and agricultural wastes in developed and in developing ountries have created opportunities for utilizing these wastes in concrete. any of them have already been used in concrete as additive or replacementto cement, fine aggregates and coarse aggregates. By doing so, these wastes rastically improve many properties of fresh and hardened concrete, paving he way for major developments in concrete and construction industries. he principal binder in concrete is Portland cement whose production equires exorbitant amount of energy consumption, is costly and a major ontributor to green-house gases (GHG; one ton of Portland cement releases pproximately one ton of CO2). Furthermore, it consumes huge quantities f virgin materials that cause depletion of natural resources, such as forests, ill, mountains, etc. at an alarming rate. Given that these challenges must e dealt with effectively, the commitment to deploy immense quantities of ndustrial, agricultural and natural waste materials (palm-oil fuel ash, fly sh, coal and oil-burning by-products, bottom ash, rice husk ash, bagasse sh, metakaolin, used tires, cement dust, stone crushers dust, marble dust, ilica fume, glass, etc.) becomes imperative.
Effective utilization of various waste materials in the concrete and onstruction industry whose growth knows no boundaries and mounting vidence of worldwide interest suffice the need to produce a collective nthology of a wide variety of waste materials available today.
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Professor Shahria Alam
School of Engineering,The University of British Columbia (Okanagan Campus
Title: Utilizing shape memory alloys (SMAs) for our next generation smart civil infrastructure
Abstract:Shape memory alloys (SMAs) are special materials with substantial potential for various structural engineering applications. The novelty of such materials lies in their ability to undergo large deformations and return to their undeformed shape through stress removal (superelasticity) or heating (shape-memory effect). In particular, SMAs have distinct thermomechanical properties, including superelasticity, shape-memory effect, and hysteretic damping. These properties could be effectively utilized to substantially enhance the safety of civil infrastructures against seismic hazards. This presentation examines the fundamental characteristics of SMAs, the constitutive material models of SMAs, and the factors influencing the engineering properties of SMAs. Some of the potential applications of SMAs in buildings and bridges are discussed, including the reinforcement and repair of structural elements, and the development of kernel components for seismic devices such as piston based self-centering devices, dampers, restrainers, and isolators. The presentation synthesizes existing information on the properties of SMAs, presents it in concise and useful tables, and explains different alternatives for the application of SMAs, which should motivate researchers and practicing engineers to extend the use of SMAs in novel and emerging applications.