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1

A study on time schedules for construction projects in Hanoi, Vietnam

Hai Dinh Tuan

Archives of Civil Engineering

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2024

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Vol. 70, nr 1

667--691

EN

With its position as the capital, Hanoi is the political center as well as the second largest economic center of the country. Therefore, the city is always allocated a large budget in construction investment to create material facilities for political tasks and economic and social development. During the implementation of construction projects, a number of difficulties and limitations have appeared. In which, projects are delayed in construction and disbursement, reducing investment efficiency and not meeting the expectations of the government and people. From this fact, the authors have conducted a study to evaluate the causes affecting the time schedule of construction projects in Hanoi. The method F-APH (Fuzzy Analytic Hierarchy Process) was used to analyze data objectively and accurately about the causes affecting the time schedule. From there, these causes are classified into groups of subjective causes (from within the project) and groups of objective causes (from outside the project). The results show that subjective causes, originating from project participants, have a stronger influence than objective causes. A number of specific proposals to the actors involved in construction projects are made to eliminate or limit the impact of the causes of construction progress.

2

Delay factors in the construction of irrigation and hydropower projects in Vietnam

Nguyen Van Son, Nguyen Huu Hue, Nguyen Duc Anh, Hai Dinh Tuan

Archives of Civil Engineering

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2023

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Vol. 69, nr 1

5--20

EN

Irrigation and hydropower are among the most important sectors in the construction industry that propel the economic needs of a developing country like Vietnam. The construction of these projects often suffers from severe delays, leading to financial losses and other negative impacts on the economy. This paper aims to determine delay factors in the construction of these projects. Among many, 39 most important candidates of delay causes were identified from the literature review. Further surveys on project participants were conducted for the severity of these causes. An exploratory factor analysis was utilized to identify latent factors that cause delays in construction projects. The analysis result categorized a few groups of factors such as abnormal factors on the construction site (e.g., labor accidents, hydrology, water flow, extreme weather) and technical factors related to the construction contractor (e.g., unsuitable schedule, outdated construction technology, unprofessional workers) that have the greatest impact on the delay in construction of irrigation and hydropower projects in Vietnam. These findings contribute to the body of knowledge of project management and risk management, hence an improvement in the efficiency of the project sectors’ performance.

3

Assessment of factors influencing on the success of public-private partnerships infrastructure projects in Vietnam

Toan Nguyen Quoc, Hai Dinh Tuan

Archives of Civil Engineering

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2023

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Vol. 69, nr 1

343--365

EN

The implementation of public-private partnerships has become one of the effective models of cooperation between the public and private sectors in the development of infrastructure in Vietnam. This model has been adopted in Vietnam for many years and is intended to help governments build infrastructure and provide an opportunity to reduce government debt profiles. This study aims to identify the most critical factors that could determine the success of these projects. A questionnaire was conducted based on the participants’ experience in the implementation of public-private partnerships projects and a total of 216 respondents were received. A regression analysis shows that six critical success factors, including factors relevant to public sector, factors relevant to private sector, factors relevant to selected process partnerships, factors relevant to risk management systems, factors relevant to project information, and factors relevant to natural environment. The findings indicated that the most effective development projects could be carried out via PPPs if the government could focus on these important factors in the implementation process. The results will influence political development towards PPP and guide partners in developing public-private partnerships projects.

4

Measuring transport-related social exclusion at the meso-level using the concept of isolated islands in the big cities

Hai Dinh Tuan, Quang Nguyen Ngoc

Transport Problems

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2022

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T. 17, z. 2

5--18

EN

Using the notion of isolated urban islands, this paper discusses, from a theoretical point of view, three important but controversial issues related to the measurement of social exclusion in the big cities: (i) the extent to which social exclusion is likely to occur, (ii) accessibility indicators that are sensitive and relevant for the evaluation of social exclusion, and (iii) the geographical scale for evaluation. From an urban island point of view, two important issues have been raised: the distribution of jobs, basic facilities, and services within an urban island and the travels of people between urban islands. Therefore, social exclusion can be determined either by the affordability/acceptability of travel time/cost to access the minimum requirement of facilities/services or the number of facilities/services in reach of the individuals within acceptable/affordable travel time and cost. A person will be at risk of social exclusion if they belong to a minority group as opposed to the majority in the same society. Some levels of social exclusion risk have been proposed. The evaluation should be implemented at the meso-level (urban island). From the view of the urban islands, the issues of transportrelated social exclusion are clearly understood, and measurements of social exclusion should be solved. We feel that a detailed survey/interview is needed for areas at high risk of social exclusion, followed by an evaluation at the micro-level to identify excluded people and the causes for their exclusion. It is expected that this paper will attract researchers to pay more attention to this issue.

5

Genetic algorithm application for optimizing traffic signal timing reflecting vehicle emission intensity

Hai Dinh Tuan, Manh Do Van, Nhat Nguyen Minh

Transport Problems

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2022

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T. 17, z. 1

5--16

EN

Urbanization has created continuous growth in transportation demand, leading to serious issues, including infrastructure overload, disrupted traffic flow, and associated vehicular emissions. As a result, resolving these problems has become one of the primary missions of governments worldwide. The optimization of the traffic signal timing system is considered a promising approach to overcoming the negative consequences of increasing vehicle volume. In metropolises, oversaturated intersections, where the traffic density and vehicle exhaust emission levels are significant, have been considered as the priority to target. Several scientists have attempted to design traffic lights with the most appropriate timing. However, the majority of previous studies have not formed a comprehensive evaluation of essential factors, especially regarding the appropriate weighting of vehicle emission parameters. By assessing the all-inclusive relationship of critical elements with an emphasis on vehicle exhaust emissions, a performance index model using a genetic algorithm (GA) is established in this paper, demonstrated by data from a case study in Taiwan.

6

Utilization of Geographic Information System (GIS) for urban management of RachGia City, Vietnam

Hai Dinh Tuan, Phin Trinh Thi

Archives of Civil Engineering

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2022

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Vol. 68, nr 2

521--530

EN

KienGiang province of Vietnam is the west coast of Mekong Delta, Vietnam where RachGia city is the provincial capital. In recent years due to impacts of climate change and extreme weather, the city’s urban infrastructure has been affected by saline intrusion, flooding, collapsed house, etc. Modeling remote sensing is useful to determine rainfall. Climatic factors are affected by temperature, wind, rain, drought that people feel comfortable or not comfortable in the area because the planning and management are not well. The application of Geographic Information System (GIS) technology has supported the method such as analysis, overlap the urban infrastructure and climate change impacts layers to produce the assessment that will support urban management. The objectives of this study is to assess the impact of climate change on some of RachGia’s infrastructures through the analysis of a number of thematic maps created from GIS Database. The database will be used by local agencies in urban management and development which take into account the climate change.

7

How do contractors select material suppliers for construction projects? Evidence from Vietnam

Toan Nguyen Quoc, My Hanh Nguyen Thi, Tam Nguyen Van, Anh Pham Xuan, Hai Dinh Tuan, Thuy Nguyen Thi

Archives of Civil Engineering

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2022

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Vol. 68, nr 3

273--288

EN

Materials play an important role in determining the quality and cost of a building, especially in the context of Vietnam’s rapid urbanization today. This study aims to analyze the status quo for supplier selection for construction projects in a developing country, Vietnam. Questionnaires are designed to conduct a survey among several contractors to assess the current situation of how Vietnamese construction enterprises select their material suppliers. Senior managers, project managers, site commanders, site engineers, foreman, office staff of contractors were interviewed. Based on result analysis of 117 valid responses, the most important criteria to consider when selecting material suppliers have been identified, with the most influential ones being price, delivery time, and material quality. However, the supply of materials still reveals some constraints that must be overcome. Vietnamese construction firms should pay more attention to supplier selection to optimize material delivery efficiency. This research contributes to the understanding of the status quo for supplier selection for construction projects in a developing country. This means contractors can adopt suitable measures to select material suppliers for construction projects.

8

Comparing the risk management standpoint between the project participants for the urban road transport projects in Hanoi

Toan Nguyen Quoc, Thuy Nguyen Thi, Hai Dinh Tuan, Anh Pham Xuan

Archives of Civil Engineering

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2022

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Vol. 68, nr 2

275--295

EN

The transport system is considered the “backbone” of the urban development. Along with the rapid economic development, the urban road transport system is being paid attention and invested by Hanoi city. By the year 2050, The Hanoi municipal government is expected to complete and hand over for use about 317 urban road transport projects. Due to the high demands of social and economic efficiency, the urban road transport projects in Hanoi face many risks. In which, there are 13 high dangerous risks for the urban road transport project in Hanoi. These risks have the high probability and severity impacted on the outcome of the projects. The project participant’s risk management standpoint will determine the solutions to respond the respective risks, thereby affecting the results of the project. In this paper, the authors compare the risk management standpoint of three main project participants, including owner/project management board, consultant and main contractor/subcontractor. The difference of the risk management standpoint is shown clearly by the project participants’ assessments of 13 high dangerous risks.

9

Community participation for developing rural transport infrastructure in Dong Nai province, Vietnam

Hai Dinh Tuan, Quyet Nguyen Xuan, Nguen Duc Anh

Transport Problems

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2021

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T. 16, z. 2

45--57

EN

Developing countries are facing sustainability problems in developing rural transport infrastructure; the problems arise from the lack of financial resource and public support. Enhancing community participation promises to resolve these challenges. Demographics has a strong influence on community participation; however, how demographic characteristics interact with community participation has been yet to be focally studied. Dong Nai, a southern province in Vietnam, was selected as the case study owing to its high requirement of rural transport infrastructure. Questionnaires were sent to 438 households. An analysis of data was performed descriptively and with logistic regression. Community participation was recorded as financial, labor, material, and land contribution. Household composition, education, income, and member in household as community leader are among the highest influential factors to community participation. With the importance of community participation, the results of the study benefits both policy makers and local governments in planning, predicting the success of local development programs, and enhancing community participation, which increase the chance of success in rural transport infrastructure.