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Nhat Tan Bridge

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Temple of Literature

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Sapa

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Son Doong Cave

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Japanese Covered Bridge

Japanese Covered Bridge

Hoi An Ancient Town

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Keynote & Lead-paper Lectures

Day 2: Monday, 31 October, 2016

09:00 - 09:35

Keynote: Importance of Asia and the Activity of ACF

 

Manyop Han

Prof. in Civil Engineering, Ajou University 

President of Asian Concrete Federation

Director of Korea Society of Civil Engineers

 


The importance of Asia is growing, especially in population and construction industry. ACF was started for the needs of the industry in this region. Asian Concrete Federation (ACF) was officially launched in 2004. Since the establishment of ACF, a lot of design codes, and hosting or co-hosting of many joint seminars, symposiums and conferences has occurred.

The International Conference, as the main ACF event, has been held every two years since 2004 and has been well attended as a regular event for information exchange as well as social meetings between the participants.

Technical Board had been published and revised the Asian Concrete Model Code (ACMC) which is the first design code based on the performance based design concept. The Technical Board also published the three National Standard Specifications for Vietnam and Thailand and also seven technical reports which are the future National Standards.

The new publications, Journal and Magazine, enhance the networks and co-operations between the member countries. The Regional Board is always inviting new members and providing better services for the members, and the Organizing Committee is organizing multi-national seminars/workshops for the exchange of the new technologies and strengthening the network between the national/regional organizations and construction industries.

09:35 - 10:10

Keynote: Sustainability in structural concrete, an argument to be seriously included in conceptual design

 

Hugo Corres Peiretti

Phd MEng Prof. in Civil Engineering

President of FHECOR

Deputy President of FIB

 

 

Sustainability is a cultural issue, it should be adequately treated by the family of technicians that deal with concrete. There is nothing more sustainable than not wasting energy, material, resources. Structural optimization is an activity that, in modern times, has been relatively forgotten in structural engineering. The adequate choice of materials, structural typologies and constructive means, can increase the sustainability of construction works. Conceptual design, as a first step, can develop solutions that holistically meet all of the requirements applicable to our concrete structures and, above all, it allows the conscious development of sustainable solutions.

10:25 - 11:00

Keynote: Development of Earthquake-Resistant Design Requirements for Beam-Column Joints in Reinforced Concrete Structures

 

   James K.Wight

   Professor of Civil Engineering 

   University of Michigan, USA

   Past President of ACI


 

This presentation will review the development of modern earthquake-resistant design requirements for beam-column joints in reinforced concrete structures.  Approximately 50 years ago, there were essentially no design and detailing requirements for the beam-column joints of concrete structures constructed in regions with a high seismic risk.  Through a series of moderate to large-scale tests of beam-column connection subassemblies in the US, New Zealand and Japan, key design parameters were identified.  These included the confinement of the column core, joint shear strength, anchorage of beam reinforcement within or through the joint, and the required relative flexural strength of the column sections with respect to the beam sections framing into a connection.  Using results from this broad variety of research studies, initial design and detailing recommendations for beam-column joints were developed in the US, New Zealand and Japan.  The development of these design requirements included the first use of section over-strength factors and capacity-based design concepts. 

11:00 - 11:35

Keynote: Corrosion in reinforced concrete structures: cracking, durability, and service life

   

    Emeritus Professor Mark G Alexander

    University of Cape Town 

    South Africa

    Immediate Past President of RILEM

 

 

The presentation will address the critical issue of corrosion in reinforced concrete, a universal and important issue for all concrete structures both new and existing.  It will commence with an overview of reinforced concrete corrosion and the important factors that influence this.  It will then address the specific issue of how cracking in reinforced concrete members influences corrosion initiation and propagation, particularly in chloride environments.  The factors that influence corrosion in cracked concrete will be highlighted, and the differences between corrosion in cracked and uncracked concrete discussed.  The presentation will then focus on specific research results from our laboratory over the last decade.  These involve laboratory and site-based studies on un-cracked and cracked reinforced concrete beams, with detailed results indicating the important parameters.  Broad consequences for design of cracked reinforced concrete members in chloride environments will be indicated. 

11:35 - 12:10

Keynote: Vietnam Concrete on the way towards Sustainability

 

Dr. Le Trung Thanh

Vietnam Concrete Association

Vietnam Ministry of Construction

 

 

 

Over the past 30 years, since the “Doi moi” policy initiated in 1986 when Vietnam made a shift from a highly centralized planned economy to a mixed market economy with a socialist orientation, different types of concrete have been developed and applied for many structures of construction projects in Vietnam. Production capacity of cement that is the main ingredient of concrete has been increased significantly and approached approximately 76.3 million tonnes in 2015. Vietnam becomes one of top countries producing high volume of cement in the world. Besides increasingly producing cement, the exploitation of river sand and limestone aggregate has been also increased to meet the demand of production of concrete. These have raised concerns in public for the negative impact on the environment in Vietnam. Therefore, the government and professional organisations involving in cement and concrete development in Vietnam have taken various actions comprising improvement of laws, technical regulations, standards and codes as well as creation of funding to sponsor for many research towards sustainable development of cement and concrete. As a result, in the coming time Vietnam concrete is definitely on the way towards sustainability and it will contribute significantly to the green growth strategy of Vietnam as well as the sustainability development of construction sector in Asian area and worldwide.

13:30 - 14:00

Lead-paper: Researches and Applications of UHPC in China

 

Prof. Caijun Shi

Editor-in-Chief, Journal of Sustainable Cement-Based Materials 

College of Civil Engineering, Human University, Changsha, China &

China Building Materials Academy, Beijing, China 

 

 

As a new cement-based material, UHPC has a character of high strength and superior durability. In this paper, researches and applications of UHPC in China are reviewed. Using conventional supplementary cementitious materials to replace cement and silica fume, UHPC which satisfied performance requirement could also be prepared by ordinary process. Silica fume and nano-SiO2 accelerated the hydration of cementitious materials of UHPC, but slag slowed the hydration of cementitious materials of UHPC. The microstructure of UHPC was very uniform and dense. The tensile, flexural, shear, bond strengths and peak strain of UHPC were far larger than those of ordinary concrete. Incorporation of steel fiber could significantly increase the toughness of UHPC. The freezing and thawing resistance and reinforcement corrosion resistance of UHPC were better than those of ordinary concrete.Since the first application of UHPC in 2005, it has been widely used as cable covers along high speed railrays and subways, bridge beams, wall panels and sidewalk panels in China.

13:30 - 14:00

Lead-paper: Performance Assessment of Concrete Structures – General Approach for Damages under Combined Effects

 

Ueda Tamon

Prof. at Division of Engineering and Policy for Sustainable Enviroment 

Faculty of Engineering

Hokkaido University, Japan

 

 

This paper emphasizes the importance of maintenance and repair of existing structures to make the structures more sustainable. Assessment of structural performance, which is the key technology for maintenance and repair, is briefly introduced. Damages are caused by various actions, both mechanical loadings and environmental actions, which alter structural performance of structures. Damages usually occur under more than one cause. This paper briefly presents a general approach to understand damage evolution mechanisms and to model material properties under combined effects.

13:30 - 14:00

Lead-paper: Effect of SRA Admixture on the Shrinkage and Other Properties of Cement Composites

 

Stanislav Unčík

Prof. at Department of Material Engineering 

Faculty of Civil Engineering 

Slovak University of Technology in Bratislava, Slovakia

 

 

 

Concrete and cement composites in general are one of the most durable construction materials. However, development of cracks adversely affects its durability, appearance and functionality. One of the greatest weaknesses of these materials is shrinkage and the formation of shrinkage cracks and deformations. Shrinkage reducing admixtures (SRA) have been used to reduce drying and autogenous shrinkage. This paper presents the results obtained in studying the effect of various doses of shrinkage reducing admixture (SRA) on properties of cement paste. A chemical shrinkage, hydration temperature, basic rheological properties (consistency), density of the fresh hardened cement paste, drying shrinkage, compressive strength and structure of the hydration products by differential thermal analysis of prepared mixtures were measured in this study. The obtained results showed that shrinkage reduction due to the SRA products was rising with an increasing dose of admixture without deterioration of workability. There was also not achieved a significant impact of SRA on the development of compressive strength of samples. These results give a good basis for the use of the admixture to solve the problems of excessive shrinkage of concrete structures.

15:30 - 16:00

Lead-paper: Characteristics and use of fly ash in concrete in some Asean Countries

 

 

Prof. Dr. Somnuk Tangtermsirikul

Director of the Sirindhorn International Institute of Technology, Thammasat University  

Head of the Construction and Maintenance Technology Research Center 

 

 

This paper provides preliminary information on characteristics of some coal generating plants’ fly ashes which are available and used in some ASEAN countries i.e. Indonesia, Laos, Thailand and Vietnam.  A part of problems and solutions to the problems are elaborated.  Successful application including problem solving in Thailand are briefly introduced.  A short summary of properties of concrete with high LOI fly ash, which is a major type of fly ash in Vietnam, is given together with demonstration on advantage of the fly ash when used in mass concrete.  It was found that most fly ashes in the studied ASEAN countries are low CaO fly ash excepting that in Thailand in which majority of its fly ashes are CaO rich.  When compared to low CaO fly ashes, high CaO fly ashes are better in the following performances; faster setting, higher early strength, better carbonation resistance.  On the contrary, low CaO fly ashes are more beneficial in lower heat generation, better ASR, NaSO4 and acid resistances.  Performances do not depend only on their chemical composition but also on their physical properties, especially particle shape, size and size distribution.  Fly ashes in Indonesia, Laos and some fly ashes in Thailand share the same problems, i.e. bad particle shapes (non-spherical or porous or both), leading to high water requirement.  In Thailand, high free lime and SO3 content are recent problems.  Our studies in Thailand show that fly ash with free lime as high as 4% can be used in concrete without problems.  Integration of limestone powder as the third binder for the multi-binder system with cement and fly ash can improve early strength development and many other durability properties of the fly ash concrete.  Dumped wet fly ash, if low in CaO content, can be applied without any adverse effect.  Vietnam has a different problem which is high LOI in the fly ashes.  A preliminary series of tests show that high LOI fly ashes can be used effectively by applying water reducing admixtures to compensate the water requirement and strength drawbacks.  Heat generation and thermal cracking analysis also shows that the high LOI fly ash can be effectively applied for mass concrete construction.  In summary, although there are different problems of fly ashes in different ASEAN countries, many better performances of fly ash concrete beyond cement-only concrete still coexist.

15:30 - 16:00

Lead-paper: Repair and strengthening of existing structures with ultrahigh performance concrete

 

 

Nguyen Viet Tue

Prof. at Institute of Structural Concrete

Faculty of Civil Engineering

Graz University of Technology, Austria

 


 

Ultra-high performance concrete (UHPC) has high potential for the repair and retrofitting of existing steel and concrete constructions. A thin UHPC layer of a few centimetres can improve the structural behaviour regarding both bearing capacity and durability and replace the protecting layer such as waterproofing. Due to its excellent durability properties an extended service life of a structure retrofitted by UHPC can be expected. Hence, the life-cycle costs decrease. This paper demonstrates the potential to repair and strengthen existing steel and concrete constructions, by two practical approaches.

15:30 - 16:00

Lead-paper: New Recommended Practices in Concrete Durability

 

David Millar

CEO of the Concrete Institute of Australia 

Member of the Executive Council of the Asian Concrete Federation 

Past Executive Director of the Concrete Pipe Association of Australasia 

 

 

Prior to the 1970’s concrete was generally regarded by asset owners, designers, and contractors as a reliable construction material that provided long term durability with relatively little maintenance. Subsequently, premature deterioration of concrete structures, arising from changing cement characteristics, quality management, and a number of other factors, damaged this reputation. Because concrete is a complex material, research into the cause of problems and development of appropriate new rules and operational methods has taken a long time.

The durability of concrete structures does remain a complex and difficult issue to design and manage due to many variables. Whist research into concrete durability continues, the knowledge on exposure significance, deterioration processes, materials properties and workmanship implications has developed significantly over the last 25 years. In this time new durability design practices have been developed, including durability modelling methods, and new methods of construction have been introduced.

It has been identified that these developments are not fully reflected in a clear and unified manner through the Australian Standards dealing with concrete durability requirements, with various codes calling up different durability requirements for similar needs and environments. The Concrete Institute of Australia’s Durability Technical Committee perceived a need for a broader review of durability requirements, and following extensive industry consultation, determined that a comprehensive and unified durability guidance was required. The topics considered under this review include: planning, exposure classes, deemed to comply requirements, good practice, modelling, cracks and crack control, and testing.

This paper will present an overview of these topics and how they can be best used by the concrete industry to develop greater knowledge, specification, and application of durability practice.

Day 3: Tuesday, 01 November, 2016

08:00 - 08:30

Lead-paper: Performance assessment of compressive strength of concrete - an engineering approach

 

Subhajit Saraswati

Professor of  Construction Engineering Department

Jadavpur University, Kolkata

Vice President (Policy) of Asian Concrete Federation

 

 

 

Strength development in case of concrete with multiple mineral admixtures depends on the hydration characteristics of mineral admixtures. Prediction of compressive strength of concrete with mineral admixtures depends on the strength vs water cement ratio relation that takes into account hydration characteristics of mineral admixtures. In this work, relation between strength ratio (fc/fm) and w/cm has been developed for concrete with mineral admixtures like fly ash, GGBS and silica fume based on extensive experimental work. The relationship is verified from experiments and found to work reasonably well.

08:00 - 08:30

Lead-paper: Development and application of concrete arch bridges in China

 

Professor Bao-chun Chen

College of Civil Engineering

Fuzhou University, China

 

 

Arch bridge is one of the main bridge types in China. Concrete with high strength in compression and limited tension is an ideal construction material for arch due to its domain force is compression. Therefore, many concrete arch bridges have been built in China. Firstly, this paper briefly introduces the construction of reinforced concrete arch bridges in China in recent years, and makes the statistic of reinforced concrete arch bridge with span of more than 200m at home and abroad, and analyses the development situation of reinforced concrete arch bridge, and focuses on Nanpaniiang River Bridge, Beipanjiang Railway Bridge. Secondly, this paper introduces the common construction methods of reinforced concrete, and describes the research progress of reinforced concrete arch bridge in new material and new structure in recent years. Finally, the future development trend of reinforced concrete arch bridges, and research on new materials, new structures and construction methods are prospected in this paper. This paper briefly introduces the present application of concrete arch bridges in China, including the investigation of the number and the span of concrete arch bridges with a span no less than 150m, some typical long-span bridges under construction, the main structural types and the construction methods as well as prediction of the future trends.

 

08:00 - 08:30

Lead-paper: ACI Certification – A Tool for the Concrete Industry to Improve the Quality of Concrete Construction

 

Mike Schneider

Sr. Vice President/Chief People Officer of Baker Concrete Construction

Past President of ASCC (American Society of Concrete Contractors)

Current President of American Concrete Institute

10:15 - 10:45

Lead-paper: Recycled Demolition Aggregate - Developments during the last 15 Years in the North West of England

 

 

Marios Soutsos

Professor of Structures/ Materials

School of Natural and Built Environment 

Queen’s University Belfast

 

 

There have been considerable developments in Merseyside and generally in the North West of England over the last fifteen years with regards to the commercialisation of recycled demolition aggregate. Merseyside, and more specifically Liverpool is an urban region that has undergone regeneration in the last fifteen years. This required the demolition of old infrastructure and subsequent reconstruction required new construction materials. Investigations into the economics, practicalities and technicalities of using recycled demolition aggregates in concrete precast products started in 2001. At that time, there were six demolition contractors around Liverpool and they were using mobile crushers which were suited for road subbase material but not for the smaller sized aggregate required for precast concrete products. It was estimated that if all six worked round the clock, i.e. assuming there was enough feed material, they would still have found it difficult to maintain the required supplies for a single precast factory. Investment in equipment was therefore required to guarantee supply and improve the quality of the recycled demolition aggregate. The market forces and the incentives/drivers for construction companies to adopt sustainable practises have encouraged investment of several million pounds to be made in new recycling plants and this has resulted in “urban quarries”. This paper describes the developments in recycling of construction and demolition waste over the last fifteen years in Merseyside and shows that recycling is not only sustainable but also profitable.

10:15 - 10:45

Lead-paper: The Comparative Study of Fire Resistance Design Methods of Reinforced Concrete Structures

 

Duinkherjav Yagaanbuyant

Ph.D at Warsaw University of Technology 

Lecturer at Mongolian National University  

Member of MCA, MACE, JACE and ACI 

 

 

Not only the bearing capacity and stability requirements of the reinforced concrete structures but also the fire resistance requirements should be satisfied in the design stage. Damages and collapses of the structures during actual fire result from the shortcomings of the design methodology, simplified assumptions of the calculation, and of an erroneous data of an experimental study that are used as a basis of the design. The initiative to change the existing National Building Code System in alliance with Eurocode is currently taking place in Mongolian construction industry. Tabulated method and simplified method are the most used methods in the design of fire resistance of reinforced concrete structures. The comparative study of tabulated methods of fire resistance specified in Eurocode and Mongolian current codes is discussed in this paper and graphical representation of the data is proposed.  

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