Professor, Rector of National University of Civil Engineering, Conference Co-Chairman
Professor, Rector of University of Architecture Ho Chi Minh City, Conference Co-Chairman
Professor, DSc, Rector of TIIAME, Conference Co-Chairman
Professor, Rector of Hanoi Architectural University, Conference Co-Chairman
Professor, DSc, Full Member of the Russian Academy of Architecture and Construction Sciences, Acting rector of Moscow State University of Civil Engineering, Conference Co-Chairman
Vice Rector, National University of Civil Engineering, Hanoi, Vietnam
Many countries have recently experienced the remarkable growth in economy and together with their rapid construction development. The construction boom especially in mega cities such as Hanoi and Hochiminh have generated a huge amount of Construction Demolition Waste (CDW). In order to manage this solid waste, a lifecycle approach to treat and use this material is very important for sustainable development. There are a number of reasons that CDW still causes big issues on environment pollution and illegal dumping but the main reasons are lacks of Government management, encouragement policies and sustainable technologies for recycling. Thus, this research is to support the Government’s management policies and well as to promote sustainable technologies for CDW recycling. The research is to support:
This paper will introduce the results of some Management policies as well as Technologies for recycling CDW in Vietnam for sustainable development. This research is the preparation for introducing the lifecycle approach for CDW in Vietnam.
Director of Institute Of Environmental Science And Engineering (IESE), Hanoi University Of Civil Engineering, Hanoi, Vietnam
Vietnam is under intensive urbanization and industrialization. Besides impressive economic growth figures, a number of pressures on technical infrastructures are created associated with emerging environmental concerns. Daily, the urban aeras in Vietnam is consuming around 9 million m3 of water. So far, there is only 18% of municipal wastewater is being treated. Around 300 industrial parks are in operation in the country, daily discharging 950,000 m3 of wastewater, 80% of which is adequately treated. Despite of great efforts paid by the government, number of illegal dumping of untreated liquid and solid waste are still being reported. “Dead” rivers number is increasing in urban centers and in the areas with industries. Air pollution is becoming an alarming problem, estimated as much as 10 billion USD damage per year. Environmental incidents of different scales, thousands of pollution hot spots need urgent remediation actions. The studies show GDP growth could double in the coming decade, but, in return, environmental pollution would triple.
Key measures to combat emerging environmental problems in Vietnam are being discussed in the paper, with selected case studies. Recently, the new Government Decree #40/2019/ND-CP has been issued with more strict requirements on environmental impact assessment, waste management, emergency response, etc. The Polluter-pays-principle is clearly applied in new environmental protection fee Decree #53/2020/ND-CP, which has been set up based on pollution loads, and in the under-revision Environment Law. Effluent wastewater standards are being also revised switching to river receiving capacity thresholds. The Government is encouraging private sector investment in waste-to-energy projects, while new wave of wastewater management projects is coming up in the urban centers. Eco-industrial park initiatives, smart-city solutions, and green building projects are being realized.
Ph.D., Rector of the University for Information Science and Technology “St. Paul the Apostle”, North Macedonia
Bitcoin, Ether, Ripple, Litecoin, darkweb, blockchain, hyperledger. Some keywords that appeared lately in our lives. Disruptive technologies or fraud? Enablers for the society or hidden tools of the villains? Revolution or a scam?
Blockchain Technologies or Distributed Ledger Technologies (DLT) are based on a distributed database that maintains a continuously growing list of ordered records called blocks. Each block contains data, a timestamp, and a link to theprevious block, which makes it inherently resistant to modification. Once recorded, the data cannot be altered retroactively. The whole concept is based on the well-established cryptographic hash functions. With a peer-to-peer network and a distributed time-stamping server, the blockchain is managed autonomously. Blockchains are secure by design and provide a high level of trust. It makes them suitable for storing events and other records, while proving the data provenance. The two most popular blockchains are the digital currency Bitcoin and the smart-contract platform Ethereum. Besides the use for cryptocurrency, the blockchainoffers all the communications among machines, sensors and persons, and will improve the customized records to track the whole production, supply and maintenance chain.
In this keynote speech, we will present the basics of the blockchain technologies and their disruptive potential. At the same time we will try to answer some of the questions that many of you were hesitating to ask elsewhere. I will also list some of the advantages that the blockchain and DLT offer in various applied and business models. In summary, we identify the great disruptive potential of the blockchain, such as its certification ability, the impossibility for modification, no necessity of a middle party, dynamic contracting, as well as instant execution including the payment.
DSc, Professor, Head of Department of Heat Engineering and Technology, Riga Technical University, Latvia
Designing energy efficient building it is important to find the balance between building thermal insulation level, type of ventilation systems and thermal comfort. For example, in-creasing the thickness of thermal insulation layer and using the mechanical ventilation system with heat recovery significantly decreases energy consumption by about 45%, but there is a risk of overheating, which is needed to be prevented. Extra thermal mass - latent heat - can have a negative impact on overall thermal comfort due to limited possibility for heat discharge. According to the Energy Performance of Buildings Directive, the goal is to reduce the energy consumption for cooling the building and at the same time to improve the indoor climate and to prevent overheating.
On the basis of dynamic simulations, the dependences between overall energy efficiency of the building and such parameters as its orientation, urbanization, the types of glazing and ventilation strategies can be easily estimated. Building energy modelling allows to predict the energy consumption of the building, to find and correct the weak spots in terms of energy consumption and to find the most effective way to use energy saving technologies. Dynamic energy simulation allows a whole-year detailed and dynamic multi-zone simulation application for study of thermal indoor climate and the entire building energy consumption. The main advantage of the dynamic software package is a detailed report for each of the building zones and for the whole building, which includes calculation of heat flows and inflows, maintained temperatures, sources of heat losses and energy costs to maintain a comfort temperature.
DSc, Department of Soil Mechanics and Geotechnics, Moscow State University of Civil Engineering, Russia
Soil liquefaction is one of the challenging issues in geotechnical engineering in seismic areas. Besides, pile foundations are viewed as a foundation solution in liquefiable soil. However, numerous case histories show pile foundations that suffer severe damage or fail completely when the ground surrounding the pile liquefies. One of the reasons is the increase in foundation settlement after soil liquefaction. Unlike the liquefaction potential assessment, or liquefaction-induced settlement of structures on shallow foundations, which are discussed by many researchers, the settlement of pile foundations after soil liquefaction has not been studied extensively. This paper present calculation of pile foundations in different cases, taking into account the influence of soil liquefaction, based on the hypothesis that the additional downward loads due to self-compaction of the liquefiable soil layers affect the piles. Finally, a brief comparison of the calculation results in the different cases is presented. This paper provides a useful calculation and importance of further researches of the liquefaction-induced settlement of pile foundations for seismic design.
Dr.-Ing, Professor, Department of Engineering Sciences - Transportation, University of Applied Sciences in Berlin, Germany
The main task of a high-quality road design is to provide the driver with a clear information about the course of the road at an early stage. The good visual guidance on highways is a prerequisite for adequate driving safety. Therefore, the sight distance has a significant impact on traffic safety, performance, speed behavior and driving comfort. At least the required stopping sight distance should always be guaranteed on highways, in order to ensure traffic safety and quality of traffic flow. The purpose of the stopping sight distance is to enable the driver to stop in time in front of an unexpected obstacle with a certain height on the road or in front of the end of a traffic jam. In addition, as a regulating element in road design, it is intended to ensure early driver information and orientation. The driver reacts to external influences by choosing the speed and changing it. Therefore, the speed parameter itself represents the best and most suitable evaluation criterion for driving behavior. In this paper, it has been succeeded to prove, that the existing sight distance has an influence on the speed on highways in Germany. A clear increase in the 85th percentile speed was determined with an increasing existing sight distance up to 400 m. At a sight distance above 400 m V85 remained almost constant. An increase in the 15th percentile speed was only noticeable up to a sight distance of 300-350 m, after which V15 remained at the same level.
DSc, Professor, Moscow State University of Civil Engineering, Russia
Institute for Problems in Mechanics, Russian Academy of Sciences, Russia
Bauman Moscow State Technical University, Russia
Arrivals of high intensity seismic Rayleigh and Rayleigh – Lamb waves to the foundation structures of buildings, tunnels and other structures with large footprint especially when one plane dimension substantially surpasses the other (e.g. runways and taxiways in airports), are analyzed. The most frequent cases of fracture and damage of the foundation structures and the airport runways are discussed. Methods for seismic protection from the main types of surface seismic waves, Rayleigh, Rayleigh – Lamb, Love, and some recently observed, more peculiar evanescent (head) waves of SP and PS type, are considered. Analytical and numerical methods for modeling interaction of building structures with these types of surface seismic waves, are analyzed. Comparative analysis of the wave dynamic method and methods based on the spectral decomposition, is given.
The developed methodology comprises numerical simulation along with asymptotic and analytical methods for the anomalous behavior of seismic surface waves, including evanescent waves of large intensity. The asymptotic analysis relies on the combination of Cauchy sextic formalism with the exponential fundamental matrix method and the transverse matrix method, known also as the Thomson – Haskell method. The performed analyses reveal tremendous reduction in the seismic wave intensity within the protected regions, attending energy attenuation in more than six times, comparing with the unprotected regions.
PhD, Assistant Professor, Faculty of Civil Engineering, Wroclaw University of Science and Technology, Poland
There is a big need for “infrastructure”, “food” and “energy” for the growing populations. The world needs simple, cheap and robust geotechnical technologies to be applied in large infrastructural projects (roads, railways, dams, hydro-energy, flood protection, water supply for people and agriculture. Due to heterogeneous character of soils, their geotechnical parameters are somehow time dependent. It is caused by spatial variability of soils, seasonal changes and changes imposed by stress conditions (consolidation). The proper methodology of control procedures is thus time-dependent. In most of the earthworks and piling projects, delaying of tests brings some gain from so called “soil setup”, when the reconsolidation of the ground increases its stiffness and mechanical properties. In some cases, however, when organic or contaminated soils are considered, the time may bring serious threats due to possible corrosion. Such examples may be found when soil mixing with hydraulic (cementous) binders is considered for a long term.
All the control procedures must be subject of a compromise between our need to provide fast response to the building site (permission to continue the works) and the responsibility for the issues that may appear in a longer period. Well planned Quality Control Plan should consider this time-dependency.