Nanotechnology: The Emerging Field of Civil Engineering Particularly in Developing Countries

2014 ◽  
Vol 974 ◽  
pp. 329-334
Author(s):  
Tanvir Manzur ◽  
Ma Bashar Emon ◽  
Kabirul Islam
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Developing Countries ◽  
Construction Industry ◽  
Silica Fume ◽  
Cement Hydration ◽  
Civil Engineering ◽  
Alkali Silicate ◽  
The World ◽  
Research On Application

Nanotechnology has taken the world of science by a storm and construction industry is no exception. The most important aspect of construction industry that can be influenced by nanotechnology is cement and concrete. Recent research on application of carbon nanotubes (CNT), both single-walled and multi-walled, shows significant increase in mechanical properties of concrete. Other properties of concrete e.g. durability, permeability, cement hydration etc. can be conveniently influenced with the help of Alkali-Silicate Reaction (ASR) studies, nanoScale Silica Fume, integration of nanoParticles in cement-synthesis and a lot other methods. And as a matter of fact, the future of cement based construction industry seems to be shaped by nanotechnology as even developing countries like Bangladesh are coming forward now-a-days to harness the potential of this rapid growing field.

scholarly journals Fresh and Mechanical Properties of Self-Consolidating Concrete Incorporating Silica Fume and Metakaolin

2021 ◽  
Author(s):  
Syed Ahmed
Keyword(s):  
Mechanical Properties ◽  
Construction Industry ◽  
Silica Fume ◽  
High Flow ◽  
Self Consolidating Concrete ◽  
Supplementary Cementing Materials ◽  
The Past

Self-consolidating concrete (SCC) has been gaining greater interest over the past decades with its excellent offerings of efficiency, beauty, and savings. Due to its high flow ability, resistance to bleeding, and non-segregating properties, SCC holds tremendous potential for use in the construction industry. SCC requires no vibration and can fill capacities, including the ones with even the most congested reinforcements. Since SCC can be obtained by incorporating supplementary cementing materials (SCMs) such as silica fume and metakaolin. It is crucial to develop and test different SCC mixtures with different volumes of SCMs to evaluate fresh and mechanical properties. Although silica fume is used in the production of SCC, the use of metakaoline in SCC is new. In this project, eleven SCC mixtures having different volumes of silica fume and metakaolin are developed. In addition, the influence of the above mentioned pozzolans (silica fume and metakaolin) on the fresh and mechanical properties are analyzed. Recommendations on fresh and mechanical properties of silica fume and metakaoline based SCC mixtures are also provided.

Globalization of Structural Design and Construction in Developing Countries

2019 ◽  
Author(s):  
B. C. Roy ◽  
Sumit Wagh
Keyword(s):  
Developing Countries ◽  
Construction Industry ◽  
Structural Design ◽  
Cost Optimization ◽  
The World ◽  
Global Construction ◽  
Context Specific ◽  
Design And Construction

<p>Globalization is shrinking the world in many senses, but at the rates at which it is happening in various countries is different depending on where any country is situated on the scale of development; however, in construction industry, the level of globalization is much lower than in other segments of the economy, across most of the countries. True and the desired level of globalization can be achieved only when the design and construction practices are globally harmonized but adopting context-specific customization to accommodate the genius of each country. This paper aims to promote such diversity in unity. The global construction industry will be the biggest beneficiary of such a globalizing movement. World has faced several crises in different countries due to many reasons like war, terrorism, bad governance, which is leading to unemployment even among highly capable engineers. A globalized environment in construction would leverage global talent despite such adverse socio-political and environmental differences. Cost-optimization is likely to take on a different meaning, gaining a wider level of acceptability across the globe.</p>

Variation of Concrete Strength with the Insertion of Carbon Nanotubes

2013 ◽  
Vol 818 ◽  
pp. 124-131
Author(s):  
Assed N. Haddad ◽  
Jorge F. de Morais ◽  
Ana Catarina J. Evangelista
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Construction Industry ◽  
Concrete Strength ◽  
Cement Composites ◽  
Deformation Properties ◽  
The Face ◽  
Non Destructive ◽  
Technological Community

Nanomaterials could change the face of modern construction because they are more resistant, more durable and have notable features. Concrete is a material widely used in construction industry worldwide. Carbon nanotube has been considered a new and outstanding material in nanoscience field with great potential application in the construction industry. The study presented in this paper, aims at assessing how carbon nanotubes can affect cement composites and so the concrete, in terms of microstructure and physical-mechanical properties. Three different ratios of carbon nanotubes have been searched: 0.20%, 0.40% and 0.60%. To evaluate the mechanical properties of the samples, destructive and non-destructive tests were carried out to obtain compressive strength, tensile strength by diametrical compression, dynamic modulus of elasticity as well as the determination of their deformation properties. This work also aims to motivate entrepreneurs and professionals in the sector of civil engineering on the advantages of the application of nanotechnology in construction, as well as providing information to the scientific and technological community in general.

scholarly journals Comparing the Chinese Construction Industry with Other Developing Countries to Identify an Applicable Solution to Low Construction Performance

2020 ◽  
Vol 12 (2) ◽  
pp. 81
Author(s):  
Yutian Chen ◽  
Oswald Chong
Keyword(s):  
Developing Countries ◽  
Saudi Arabia ◽  
Construction Industry ◽  
The United States ◽  
State University ◽  
Arizona State University ◽  
Kingdom Of Saudi Arabia ◽  
High Performing ◽  
Best Value ◽  
The World

The Chinese Construction Industry (CCI) has become one of the largest in the world within the last 20 years. However, due to its rapid growth it has been experiencing issues causing the industry to struggle with delivering high performing projects. Due to the differences between developed and developing countries construction industries, research from other developing countries that were similar to China (Vietnam and Kingdom of Saudi Arabia) were used to help identify solutions to improve the CCI. Previous research has identified the major risks in Vietnam and Saudi Arabia. It has also been identified the only solution that has documented evidence that it can improve construction performance is the Best Value Approach that was developed in the United States at Arizona State University. A literature research was performed identifying the major risks and issues that have been documented in the CCI. These risks were then compared to that of the Vietnam and Kingdom of Saudi Arabia’s construction industry risks. It was identified that the majority of the top risks were similar in all three countries. Identifying that developing countries have been experiencing the same issues. This also identifies that the Best Value Approach might be a solution to help improve the CCI.

scholarly journals IDENTIFYING BARRIERS TO OFF-SITE CONSTRUCTION USING GREY DEMATEL APPROACH: CASE OF CHINA

2018 ◽  
Vol 24 (5) ◽  
pp. 364-377 ◽  
Author(s):  
Yanhu Han ◽  
Lufan Wang
Keyword(s):  
Developing Countries ◽  
Focus Group ◽  
Literature Review ◽  
Construction Industry ◽  
Questionnaire Survey ◽  
Group Discussion ◽  
Comprehensive Literature Review ◽  
Depth Interview ◽  
The World ◽  
Traditional Construction

Off-site construction (OSC) methods have been widely adopted in the construction industry around the world. However, in a lot of developing countries, the application of OSC still lags behind. Although a number of research efforts have focused on identifying the OSC barriers, they are limited to qualitative descriptions, which lacks the understanding of the interrelationships among the barriers. To address this gap, this paper proposed a methodology for identifying the OSC barriers and their cause-effect relationships. The proposed methodology is composed of three phases: (1) a comprehensive literature review and in-depth interview with the OSC industry experts, (2) questionnaire survey and focus group discussion, and (3) grey DEMATEL analysis. The proposed methodology was applied in the context of China’s construction industry. The results of the grey DEMATEL analysis provided the cause-effect relationships of the 35 identified OSC barriers, which indicated six important aspects be taken into deeper consideration, such as governmental regulations and incentives, OSC practices and experiences, as well as traditional construction method transformation. The outcomes of this study will support policymakers and OSC participants to identify the influencing OSC barriers and their interrelationships, as well as propose appropriate strategies for overcoming the barriers and broadening the OSC application.

scholarly journals Modification of cement systems by carbon nanotubes

2019 ◽  
Author(s):  
Skripkiunas Gintautas
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Titanium Dioxide ◽  
Composite Materials ◽  
Construction Industry ◽  
Setting Time ◽  
Oxide Nanoparticles ◽  
Nano Silica ◽  
Hardened State ◽  
Aluminium Oxide Nanoparticles

The nanoparticles and nanostructures such as nano silica, nano metakaolin, titanium dioxide and aluminium oxide nanoparticles, graphite nanomaterials, carbon nanotubes are used for modification of composite materials in construction industry. The considerable attention of researchers is focused on the investigation of cement systems modified by carbon nanotubes (CNT). The present research describes the generalized data about modification of cement systems by CNT suspension in fresh and hardened state. The influence of carbon nanotubes on setting time of cement paste, rheological and mechanical properties of nanomodified cement systems are demonstrated in the present research.

scholarly journals Fresh and Mechanical Properties of Self-Consolidating Concrete Incorporating Silica Fume and Metakaolin

2021 ◽  
Author(s):  
Syed Ahmed
Keyword(s):  
Mechanical Properties ◽  
Construction Industry ◽  
Silica Fume ◽  
High Flow ◽  
Self Consolidating Concrete ◽  
Supplementary Cementing Materials ◽  
The Past

Self-consolidating concrete (SCC) has been gaining greater interest over the past decades with its excellent offerings of efficiency, beauty, and savings. Due to its high flow ability, resistance to bleeding, and non-segregating properties, SCC holds tremendous potential for use in the construction industry. SCC requires no vibration and can fill capacities, including the ones with even the most congested reinforcements. Since SCC can be obtained by incorporating supplementary cementing materials (SCMs) such as silica fume and metakaolin. It is crucial to develop and test different SCC mixtures with different volumes of SCMs to evaluate fresh and mechanical properties. Although silica fume is used in the production of SCC, the use of metakaoline in SCC is new. In this project, eleven SCC mixtures having different volumes of silica fume and metakaolin are developed. In addition, the influence of the above mentioned pozzolans (silica fume and metakaolin) on the fresh and mechanical properties are analyzed. Recommendations on fresh and mechanical properties of silica fume and metakaoline based SCC mixtures are also provided.

scholarly journals Optimization and valorization of recycled fiber in non-woven fabric

2019 ◽  
Vol 69 (06) ◽  
pp. 440-445
Author(s):  
HALIMI MOHAMED TAHER ◽  
HASSEN MOHAMED BEN ◽  
WANNASSI BECHIR
Keyword(s):  
Mechanical Properties ◽  
Developing Countries ◽  
Physical And Mechanical Properties ◽  
Good Alternative ◽  
Added Value ◽  
Woven Fabric ◽  
The World ◽  
Recycled Fiber ◽  
Nonwoven Textiles ◽  
Recycled Fibers

The range and volume of textile products used every day is growing exponentiallythroughout the world, in both developed and developing countries. Therefore, the issues of waste Management and valorization become a challenge that requires depth economic and technical studies. In this setting, we aimed in this paper to give an added value of two kinds of textile wastes: yarns and textiles garments wastes collected from Blue denim manufacturer. A quality assessment of the reclaimed fibers shows satisfying physical and mechanical properties that allow them to be used to produce nonwoven textiles materials. A set of properties are investigated and results revealed that nonwoven structures can be considered as a good alternative for yarn and woven recycled fibers exploitation.

scholarly journals Analysis of the Causes of Accident in Construction Project

2018 ◽  
Author(s):  
Shakil Ahmed
Keyword(s):  
Developing Countries ◽  
Construction Industry ◽  
Statistical Data ◽  
Construction Project ◽  
Protective Equipment ◽  
Relative Importance ◽  
Construction Site ◽  
Importance Index ◽  
The World ◽  
And Training

Bangladeshi construction industry suffers a lot of safety and accidental issues than other developing countries in the world. Among many of these, accident of construction project goes far beyond and shape a horrific figure of death for every year. The aims of this study is that analysis and discussion of causes of accident at construction project in Bangladesh. A widespread statistical data collection and data analysis take place to identify the causes and design the questionnaire. The questionnaire-based survey was used to elicit the attitude of four stakeholders as workers, owners, consultants, and contractors towards passive causes of fatal accident at construction site. These study also identify 77 passive causes under 14 major groups and ranked them based on Relative Importance Index (RII). The top 5 major group of causes are (1) Management related, (2) Consultant related, (3) Technology related, (4) Labour related and (5) Contractor related. The top 5 passive causes are: (1) Unaware of safety-related issue, (2) Lack of personal protective equipment, (3) Lack of safety eliminating/ avoiding design, (4) Unfit equipment, (5) Lack of knowledge and training on equipment.

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