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Program & Schedule


Program Rundown
2 Dec 2018 (Sunday)
TIME
EVENT
5:00 pm - 7:00 pm
Reception

3 Dec 2018 (Monday)
TIME
EVENT
8:45 am - 9:15 am
Registration

9:15 am - 9:25 am
Welcome Remarks

9:25 am - 9:30 am
Opening Remarks

9:30 am - 9:35 am
Souvenir Presentation

9:35 am - 9:40 am
Group Photo

9:40 am - 10:15 am
A Chemical Admixture with Carbon Nanotubes
Yuan Gao1(speaker), David J. Corr2, Maria S. Konsta-Gdoutos3, Surendra P. Shah4

Carbon nanotubes (CNT) are perhaps the most widely used nano materials in a wide range of applications. CNTs and CNFs (carbon nanofibers) have remarkable properties because of their nanoscale. Many attempts have been made world-wide to incorporate them in concrete. Adding CNT or CNF in concrete poses two challenges: cost and uniform dispersion. Researchers at Northwesten University have successfully tackled those challenges. CNT or CNF are ultrasonicated in an aqueous solution containing superplasticizers. The technique of dispersion will be discussed in this paper. We have observed that the addition of the aqueous solution containing a very small amount of well dispersed CNT or CNF (less than 0.1% by weight of cement) exhibit following remarkable benefits: (1) it reduces the autogenous shrinkage, (2) it delays onset of shrinkage cracking and reduces crack width,(3) it enhances the modulus of elasticity , (4) it makes concrete piezoresistive (so called smart material), (5) it enhances fracture properties and (6) the addition of CNT or CNF delays the corrosion of reinforcing bars due to ingress of chloride. This paper will discuss these multi-functional properties.

  1. Graduate researcher, Civil and Environmental Engineering, Northwesten University
  2. Professor, Civil and Environmental Engineering, Northwesten University
  3. Professor, Civil Engineering, Democritus University of Thrace
  4. Walter P. Murphy Professor (emeritus), Civil and Environmental Engineering, Northwesten University

Prof. Surendra P. SHAH

speaker

Walter P. Murphy Emeritus Professor of Civil and Environmental Engineering
Northwestern University, USA

 

Prof. Surenda P. Shah is a Walter P. Murphy Emeritus Professor of Civil Engineering and was the founding director of the pioneering National Science Foundation Science and Technology Center for Advanced Cement-Based Materials. His current research interests include: fracture, fiber reinforced composites, non-destructive evaluation, transport properties, processing, rheology, nanotechnology, and use of solid waste materials. He has co-authored two books: Fiber Reinforced Cement Based Composites and Fracture Mechanics of Concrete. He has published more than 500 jounal articles and edited more than 20 books. He is past editor of RILEM's jounal, Materials, Structures.

Prof. Shah is a member of the US National Academy of Engineering. He is also a foreign member of the Chinese Academy of Engineering and the Indian Academy of Engineering. He is the only civil engineer who is a member of these three academies. He has received many awards, including the Swedish Concrete Award, American Concrete Institute's Anderson Award, RILEM Gold Medal, ASTM Thompson Award, American Society of Civil Engineer's Charles Pankow Award, and Engineering News Record News Maker Award. He was named one of the ten most influential people in concrete by Concrete Construction Magazine. Recently, he spent time at Indian Institute of Technology, Madras as an Honorary Professor under the auspices of a Fulbright grant. He is an honorary member of American Concrete Institute and RILEM (based in Paris).

Besides teaching at Northwesten, Professor Shah has taught at the University of Illinois, Chicago and served as a visiting professor at MIT, University of Sydney, Denmark Technical University, University of Singapore, Darmstadt University, and Laboratoire Central des Ponts et Chaussees Paris. Currently, he is a member of the Institute of Advanced Studies at Hong Kong University of Science and Technology. He is also honorary professor at Hong Kong Polytechnic University, Dalian Maritime University, Nanjing Technical University and South East University.

Walter P. Murphy Emeritus Professor of Civil and Environmental Engineering,
Northwestern University, USA

10:15 am - 10:50 am
Cement-based Nanocomposites – Chances and Challenges

The use of nanomaterials and nanotechnologies for tailoring the properties of cement-based materials has a huge potential, in particular with respect to achieving entirely new functionalities. The presentation provides an overview of the recent and on-going research on cement-based nanocomposites performed at the TU Dresden and in collaboration with various partners. First, dispersion of carbon nanotubes (CNTs) in water for subsequent application in cement-based systems is discussed, while analyzing the effects of CNT-type (precursor type), ultrasonication regime, molecular architecture of surfactants, temperature and other parameters. Next, the influence of CNTs on mechanical properties is briefly addressed, but the main focus is on sensing and thermoelectric properties of nanocomposites induced by CNTs. The achieved characteristics will enable the use of such nanocomposites as extra durable and multifunctional sensors as well as thermoelectric generators for large-scale thermal energy harvesting. Furthermore, hierarchical all carbon reinforcement with multifunctional properties and enhanced stiffness and interfacial shear strength is presented. Finally, a novel type of textile and bar reinforcements made of continuous carbon fiber (CF) yans impregnated with mineral-based matrix is introduced. Such reinforcement structures exhibit a much higher temperature resistance at elevated temperatures in comparison to conventional CF reinforcements impregnated with polymers.

Prof. Viktor MECHTCHERINE

speaker

Professor of Construction Materials
Director of Institute of Construction Materials
Technical University Dresden, Germany

 

Prof. Dr.-Ing. Viktor Mechtcherine is Professor of Construction Materials and Director of the Institute of Construction Materials at the Technical University Dresden, Germany. Before that, he was Professor at the Technical University Kaiserslauten (2003-2006) and Chief Research Engineer with the Institute of Reinforced Concrete Structures and Building Materials at the Karlsruhe Institute of Technology – KIT (1998-2003). He graduated from the University for Civil Engineering and Architecture of St. Petersburg in 1986 and worked there in Russia as civil engineer before joining KIT in 1990, where he made his Dr.-Ing. (PhD) in 2000.

His current research interests include fibre-reinforced cement-based materials, rheology, concrete technology, additive construction, fracture mechanics, durability and new additives and admixtures. He is chair of RILEM TC 260-RSC "Recommendation for Use of Superabsorbent Polymers in Concrete Construction" and member of RILEM Bureau, RILEM Technical Activities Committee, Steering Committee of the fib Commission "Concrete", Editorial Board of the Jounal "Cement and Concrete Composites", Editorial Advisory Committee of the Jounal "Materials and Structures" and Expert Board "Construction products made of fibre-reinforced cementitious materials" of the German Institute of Structural Engineering (DIBt). Prof. Mechtcherine is a member of Science Academy of Saxony and Russian Academy of Engineering. He is also coordinator of the German Research Society Priority Program DFG SPP 2005 "Opus Fluidum Futurum – Rheology of Reactive, Multiscale, Multiphase Construction Materials" and speaker of German Research Society Research Training Group DFG GRK 2250 "Mineral-bonded Composites for Enhanced Structural Impact Safety".

Professor of Construction Materials, Director of Institute of Construction Materials,
Technical University Dresden, Germany

10:50 am - 11:05 am
Coffee Break

11:05 am - 12:25 pm
12:25 pm - 2:00 pm
Luncheon

2:00 pm - 4:00 pm
4:00 pm - 4:15 pm
Coffee Break

4:15 pm - 5:35 pm
4 Dec 2018 (Tuesday)
TIME
EVENT
9:15 am - 9:50 am
Cement Hydration Studied Under Zero Gravity Condition

Under zero gravity, chemical reactions in solution are considerably slowed down as they are controlled by diffusion only and no convection occurs. Furthermore, larger crystals will not precipitate from the solution. Cement hydration in principle involves a dissolution – precipitation process which should be significantly affected by the absence of gravity. To find out more, a series of experiments was performed on parabolic flights which offer short periods (~ 25 seconds) of zero gravity.

At first, pure C3S was hydrated during the zero gravity period. Most surprisingly, globular nano particles (~ 20 - 60 nm) were detected as the very first hydration product of C3S. This observation led to a series of experiments which demonstrated that also under terrestrial conditions, such droplets constitute the metastable precursor from which later nanofoils of C-S-H and finally the well-known C-S-H needles present in hardened cement develop.

In a second experiment, ettringite was crystallized from Ca(OH)2 and Al2(SO4)3 solutions. Here it was found that smaller, yet more abundant crystals develop compared to terrestrial conditions. The reason is that under zero gravity, the oversaturation period is prolonged, therefore more nuclei can develop while their growth then is more restricted as the ions available will be consumed by more nuclei.

Furthermore, monosulfo aluminate and C4AH13 were synthesized under short-term zero gravity. For AFm it was found that it crystallizes as nano platelets which again are considerably smaller than under normal gravity. Similarly, C4AH13 crystallizes in a dense network of nanothin foils (d ~ 5 nm).

Overall, the experiments under zero gravity gave unprecedented insight into the very early nucleation and crystal growth occurring in cement hydration. They allow us to better understand how cement hydrates actually are formed which under earthen conditions analytically is hard to follow, considering the extremely fast kinetics of early cement hydration. As such, these experiments also provide inspiration on how to optimize concrete through intelligent crystal engineering.

Prof. Johann PLANK

speaker

Chair for Construction Chemistry, Department of Chemistry
Technology University Munich, Germany

 

Professor Dr. Dipl. – Chem. Johann Plank is full professor for Construction Chemistry and head of the Institute for Inorganic Chemistry at Technical University Munich. He studied chemistry in Regensburg, Germany and in 1980 eaned a Ph.D. degree there. He then joined SKW Trostberg as a research group leader in construction polymers. He founded SKW's oilfield chemicals business and in 1997 became General Manager of SKW Construction Polymers GmbH. In 2001, he joined Technical University Munich, Germany, as a full professor for Construction Chemistry. His current research interests include cement and admixture chemistry for concrete, gypsum, mortar and oil well cementing. Prof. Plank has published about 400 scientific papers, holds 40 patents in the field of construction admixtures and has received many awards and honor professorships from universities in Japan, China, Singapore and Thailand.

Chair for Construction Chemistry, Department of Chemistry
Technology University Munich, Germany

9:50 am - 10:25 pm
Advanced Cement-based Materials through Nanotechnology

In this presentation, advanced cement-based materials through application of nanotechnology will be introduced. One example is to use cement to generate 5 nm nanoparticles to strengthen the hydrogel. By adding 5-nm inorganic particles in organic matrix, hydrogels with the best all-round performance in the world has been successfully developed in aspects of strength, elastic recovery and ultimate stretch ratio. Also, by adding organic or inorganic nano particles into cement based materials, the flexural strength of the cement-based materials increased significantly. For cement paste, bending strength is increased by three times without lowering the compressive strength. Moreover, with newly developed inorganic-organic combined nano particles, the hydration heat of cement-based materials can be reduced and their toughness will be improved without degrade their compressive properties. Finally, the high modulus concrete developed through the addition of nano particles will be introduced.

Prof. Zongjin LI

speaker

Chair Professor, Institute of Applied Physics and Materials Engineering
University of Macau, Macau

 

Prof. Zongjin Li is Chair Professor at Institute of Applied Physics and Materials Engineering at University of Macau (UM). He joined UM after his service at The Hong Kong University of Science and Technology from 1994 to 2016. He received his B.E. from Zhejiang University, Hongzhou, China in 1982 and obtained both his M.S. and PhD from Northwesten University, Chicago, U.S.A, in 1990 in 1993, respectively. He is a fellow of American Concrete Institute and a registered professional engineer in Hong Kong, China. He is a member of committees of ISO/TC71, First Vice Chair of China Group of RILEM and Founding President of ACI China Chapter.

He has done extensive researches in the area of cement-based materials and non-destructive evaluations. As the chief scientist, he has led a China Key National Basic Research Project (973), 'Basic study on environmentally friendly contemporary concrete', which has made a great contributions to advance concrete technology in China. As the founding chair of Gordon Research Conference, 'Advanced Materials for Sustainable Infrastructure Development' in 2014, he has brought the research conference of building materials into a higher scientific level.

He has published 5 technical books, in which 'Advanced Concrete Technology' published by John Wiley has been collected by many national libraries and most major university libraries and used by many universities as text or reference books for civil engineering. He has also published more than 400 technical papers with a SCI H-index of 38 and Scopus H-index of 41. In 2016, he has been selected as the one of the 150 most cited authors in Civil engineering field. He has also been awarded five US and seven Chinese patents. Three of his patents have been developed into commercial products.

He received the Arthur R. Anderson Medal from American Concrete Institute in 2017 and Distinguished Visiting Fellowship Award from British Royal Academy of Engineering in 2014.

Chair Professor, Institute of Applied Physics and Materials Engineering
University of Macau, Macau

10:25 am - 11:00 am
Quest for the Finest Concrete: How Nanotechnology Can Change the Concrete World

This presentation reviews recent developments in the field of nanotechnology applied to concrete. Various pathways for effective production of nano-SiO2 and CSH seeds are discussed. Specifically, the aspects of development and fine tuning of nano-seed products for nano-engineered concrete are discussed. It is demonstrated that the mechano-chemical activation of portland cement or fly ash systems with superplasticizer and nano-SiO2 in aqueous solution enables the formation of CSH seed product capable of considerable enhancement of strength performance of portland cement and blended binders. Experimental results demonstrate an increase in the compressive and flexural strength of mortars with developed nano-seed particles. Furthermore, it was demonstrated that the boost of performance of cementitious systems including self-consolidating concrete with activated components is due to the presence of super-reactive ultrafine and nano-seed particles.

Prof. Konstantin SOBOLEV

speaker
Professor, Department of Civil and Environmental Engineering, CEAS
University of Wisconsin-Milwaukee, USA
 
Dr. Konstantin Sobolev is a Professor and Chairman, Department of Civil and Environmental Engineering, College of Engineering & Applied Science, University of Wisconsin-Milwaukee, WI (USA). After receiving his B.S./M.S. degree from the Moscow State Civil Engineering University (Russia), he eaned a Ph.D. in 1993 from the Research Institute of Concrete and Reinforced Concrete (Russia). Since then Dr. Sobolev has been developing innovative and effective technologies for advanced materials including high-performance cement and concrete. Dr. Sobolev has published more than 180 articles in research jounals and proceedings of scientific conferences, in English, Russian, Spanish and Turkish. He has presented scientific papers in the Americas, Middle East, Europe and Asia. Dr. Sobolev is a member of Mexican Academy of Sciences (AMC), a fellow of the American Concrete Institute (ACI), a founding chair of ACI committee 241(236D) "Nanotechnology of Concrete," and a chair of "Nanotechnology-Based Concrete Materials" subcommittee AFN10(1) of TRB - Transportation Research Board of National Academies (USA).
 
Dr. Sobolev's current research interests are in application of nano-admixtures and nanotechnology in cement and concrete; application of evolutionary algorithms; modeling of dense packings of particulate materials; design, modeling and application of high-strength and high-performance materials, materials with photocatalytic properties, super-hydrophobic materials, smart stress-sensing materials.
Professor, Department of Civil and Environmental Engineering, CEAS
University of Wisconsin-Milwaukee, USA

11:00 am - 11:15 am
Coffee Break

11:15 am - 12:35 pm
12:35 pm - 2:00 pm
Luncheon

2:00 pm - 4:00 pm
4:00 pm - 4:15 pm
Coffee Break

4:15 pm - 5:15 pm
6:00 pm - 9:00 pm
5 Dec 2018 (Wednesday)
TIME
EVENT
9:15 am - 9:50 am
Use of Nano-materials in UHPC
Nanomaterials have attracted much interest in cement-based materials during the past decade. The effects of different nano-CaCO3 or nano-SiO2 contents on performance of ultra-high performance concrete (UHPC) matrix and UHPC made with 2% steel fibers were investigated. The investigated performance involves mechanical properties, calcium hydroxide content, and pore structure. The dosages of nano-CaCO3 were 0, 1.6%, 3.2%, 4.8%, and 6.4%, while the dosages of nano-SiO2 were 0, 0.5%, 1.0%, 1.5%, and 2%, by the mass of cementitious materials. Test results indicated that the optimal dosages to enhance compressive and flexural strengths of UHPC matrix were 1.6% to 4.8% for the nano-CaCO3 and 0.5% to 1.5% for the nano-SiO2. Thermal gravimetry (TG) analysis demonstrated that the calcium hydroxide (CH) content in UHPC matrix decreased significantly with the increase of nano-SiO2 content, but remained almost constant for those with nano-CaCO3. UHPC specimens with 3.2% nano-CaCO3 or 1.0% nano-SiO2 exhibited the highest compressive and flexural strengths. Beyond these critical values, the mechanical properties of UHPC decreased due to increased porosity associated with agglomeration of the nano-particles.

Prof. Caijun SHI

speaker

Chair Professor, College of Civil Engineering,
Hunan University, China

 

Professor Caijun Shi received his B. Eng and M. Eng from Southeast University, Nanjing, China and Ph.D from the University of Calgary, Canada. He is currently vice president of Asia Concrete Federation, Chair Professor in the College of Civil Engineering, Hunan University, Editor-in-Chief of “Jounal of Sustainable Cement-based Materials”, Co-editor of “Jounal of Ceramics in Moden Technologies”, Associate editor of “Jounal of Chinese Ceramic Society”, editorial board member of “Cement and Concrete Research”, “Cement and Concrete Composites”, “Construction and Building Materials”, “Jounal of Structural Integrity and Maintenance”, “Materiales de Construccion”, “Jounal of Building Materials”, “Materials Review”, “Jounal of Chongqing Jiaotong University”, and former associate editor of “Jounal of Materials in Civil Engineering”. Dr. Shi serves on many ACI and RILEM technical committees.

His research interests include characterization and utilization of industrial by-products and waste materials, design and testing of cement and concrete materials, development and evaluation of cement additives and concrete admixtures, and solid and hazardous waste management. He has developed several novel technologies and products, and has been granted four US patents and more than 15 Chinese patents. One of his inventions, Self-sealing/ Self-healing Barrier, has been used as a municipal landfill liner in the world's largest landfill site in South Korea. He has authored/coauthored more than 310 technical papers, seven English books, three Chinese books and edited/co-edited eight intenational conference proceedings. Dr. Shi has been invited to give presentations on a variety of topics all over the world. In recognizing his contributions to researches in waste management and concrete technology, he was elected as a fellow of Intenational Energy Foundation in 2001, a fellow of American Concrete Institute in 2007, and a Fellow of RILEM in 2016.

Chair Professor, College of Civil Engineering
Hunan University, China

9:50 am - 10:25 am
Passivation Process of Galvanized Steel Bars in Cement Mortars Prepared with Nano-silica
In recent years, nano-silica, as a kind of ultra-fine pozzolanic material, has been explored for use in concrete. Large amount of studies have demonstrated that it is an innovative admixture to improve the durability of concrete. But the effect of the nano silica on the corrosion of steel bars in concrete was rarely reported. The present work studied the effect of the nano silica on the passivation of galvanized steel bars (a kind of corrosion-resistant steel bar) in cement mortars. To achieve this, the intenal environmental factors of the mortar were firstly monitored and then the passivation process of the galvanized steel bars was monitored using traditional electrochemical tests and the surface characterization methods. The results showed that the presence of nano-silica influenced the passivation process of the galvanized steel bars and improved the stability and protective properties of the passive film formed. The morphology of the interface between the galvanized steel bars and the mortar was changed when the nano-silica was added. The galvanized steel bars showed good compatibility with the nano-silica in terms of the corrosion resistance of concrete structures.

Prof C. S. POON

speaker

Associate Head, Department of Civil and Environmental Engineering
The Hong Kong Polytechnic University, Hong Kong

 

Prof. C.S. Poon obtained his PhD from Imperial College, London. He spent two years as a Post-doctoral Fellow at Oxford University, specialising in cement and concrete research. Currently, he is the Chair Professor of Sustainable Construction Materials and Associate Head (Research) at the Civil and Environmental Engineering Department of The Hong Kong Polytechnic University. He has been awarded the title of Changjiang Chair Professor by the Ministry of Education. He specialises in teaching and research of concrete technology, eco-friendly construction materials and waste management. He has published over 400 papers in intenational jounals and conferences (including over 300 intenational jounal papers, and 8 patents). Prof. Poon is a Fellow of the Hong Kong Institution of Engineers and the Hong Kong Concrete Institute (HKCI). He is currently the President of the HKCI, and was a past President of the American Concrete Institute (China) Chapter.

Associate Head, Department of Civil and Environmental Engineering
The Hong Kong Polytechnic University, Hong Kong

10:25 am - 11:00 am
Tailoring the Piezoresistive Strain Sensing of Carbon Nanotube Reinforced Mortar Sensors
Carbon nanotubes (CNTs) and nanofibers (CNFs) can supply the cementitious matrix with enhanced stiffness and durability properties, as well as with excellent electromechanical and piezoresistive characteristics. This presentation highlights current research on the smartness and self-sensing characteristics of nanomodified concrete using Impedance Spectroscopy. To accurately evaluate the smartness of the nanoengineered cementitious materials it is necessary to take into consideration both resistive and capacitive phases: the resistivity values can provide the nanofibers’ percolation threshold; while the capacitive characteristics of a nano-reinforced mortar or concrete can evaluate the actual CNT/CNF distribution in the cementitious matrix, and correlate dispersion with mechanical properties and piezoresistive behavior. Furthermore, piezorestivity experiments of CNT mortar sensors, embedded into concrete elements, show the ability of the sensor to detect strain, crack propagation and damage accumulation of the concrete element at all stages of deformation, up to failure.

Prof. Maria S. KONSTA-GDOUTOS

speaker
Professor, Director of the Laboratory of Applied Mechanics
Department of Civil Engineering
Democritus University of Thrace, Greece
 
Dr. Konsta-Gdoutos, Professor of Civil Engineering and the Director of the Division of Mechanics in the Department of Civil Engineering of Democritus University of Thrace in Greece, is the director of the Center for Multifunctional Nanocomposite Construction Materials, and Adjunct Professor in Civil Engineering at Northwesten University. She develops high performance smart cementitious nanocomposites, reinforced with carbon nanotubes and nanofibers to achieve tailored properties for civil infrastructure and investigates the relationship between the microstructure and structural performance of these advanced cement based nanocomposites.
 
Maria is a Fulbright scholar, a member of the Intenational Academy of Engineering, and the recipient of the A.S. Kobayashi Young Investigator Award in Experimental Science in 2012. She holds 3 US patents for her work on the dispersion of carbon nanofibers and carbon nanotubes and their introduction in reinforcing cementitious nanocomposites. She has published over 85 papers in refereed jounals and conference proceedings and has been the invited speaker for more than ten symposia intenationally in the last five years. She is also the editor of the book "Measuring, Monitoring and Modeling Concrete Properties" published by Springer and the guest editor of several special issues in refereed jounals published by Springer and Elsevier.
 
She is a member of the ACI committees 236 Material Science of Concrete, 241 Nanotechnology of Concrete and currently serves as the chair of the ACI 241 Task Group committee "Nanofibers." She is also a member of the Society for Experimental Mechanics (SEM). She serves as the Executive Editor in Chief of the Springer Intenational Jounal "Frontiers in Structural and Civil Engineering" and is a member of the Editorial Boards of "Cement and Concrete Composites," by Elsevier and the "Jounal of Structural Integrity and Maintenance" by Taylor and Francis.
Professor, Director of the Laboratory of Applied Mechanics
Department of Civil Engineering
Democritus University of Thrace, Greece

11:00 am - 11:30 am
Closing

11:30 am - 12:45 pm
Luncheon

1:00 pm - 5:00 pm
Cultural Visit (Optional)