Study on mechanical properties of non-dispersible concrete in seawater environment

2019 ◽  
Vol 11 (6) ◽  
pp. 809-818
Author(s):  
Huijun Wu
Keyword(s):  
Mechanical Properties ◽  
Design Methodology ◽  
New Products ◽  
Main Approach ◽  
Content Type ◽  
Concrete Mixtures ◽  
Seawater Environment ◽  
Hardened Properties ◽  
Underwater Concrete ◽  
Working Performance

Purpose The purpose of this paper is to research the hardened properties of non-dispersible concrete in seawater environment, especially in seawater environment. Design/methodology/approach The main approach is according to the experiment. Findings The findings of this paper are: first, because of the washing effect of water, the strength of underwater non-dispersible concrete is lower than that of terrestrial concrete. Second, the strength of non-dispersible underwater concrete with silica fume increases remarkably at different ages. Third, underwater non-dispersible concrete does not produce new products when it is formed and cured in seawater. Originality/value In this paper, underwater non-dispersible concrete is formed and maintained on land, freshwater and seawater by underwater pouring method. The working performance, mechanical properties and durability of underwater non-dispersible concrete mixtures after hardening are tested.

Study on durability of non-dispersible concrete in seawater environment

2019 ◽  
Vol 11 (3) ◽  
pp. 443-452
Author(s):  
Wu Huijun ◽  
Zhan Diao ◽  
Kaizuo Fan
Keyword(s):  
Chloride Ion ◽  
Mineral Admixtures ◽  
Engineering Practice ◽  
Durability Test ◽  
Test Analysis ◽  
Content Type ◽  
Concrete Mixtures ◽  
Seawater Environment ◽  
Underwater Concrete ◽  
Durability Of Concrete

Purpose The purpose of this paper is to focus on the durability of underwater non-dispersible concrete in seawater environment. Design/methodology/approach In this paper, ten groups of underwater non-dispersible concrete mixtures were designed, and the anti-dispersibility and fluidity of the mixtures were tested. Findings The durability test analysis shows that different pouring methods have different effects on the durability of concrete. The durability of concrete poured on land is better than that poured in water. Different mineral admixtures have different effects on the durability of concrete: the frost resistance of the underwater non-dispersible concrete specimens with silica fume is the best; the impermeability and chloride ion permeability of the non-dispersible underwater concrete specimens with waterproofing agent are the best; and the alternation of wetting and drying has adverse effects on the durability indexes of the non-dispersible underwater concrete. Originality/value The durability of underwater non-dispersible concrete is tested and the results can be used for reference in engineering practice.

Deposition-induced effects of isotactic polypropylene and polycarbonate composites during fused deposition modeling

2017 ◽  
Vol 23 (5) ◽  
pp. 869-880 ◽  
Author(s):  
Ying-Guo Zhou ◽  
Bei Su ◽  
Lih-sheng Turng
Keyword(s):  
Mechanical Properties ◽  
Design Methodology ◽  
Fused Deposition Modeling ◽  
Content Type ◽  
Fused Deposition ◽  
Close Relationship ◽  
Molded Parts ◽  
Deposition Modeling ◽  
Injection Molded ◽  
First Time

Purpose Although the feasibility and effectiveness of the fused deposition modeling (FDM) method have been proposed and developed, studies of applying this technology to various materials are still needed for researching its applicability, especially with regard to polymer blends and composites. The purpose of this paper is to study the deposition-induced effect and the effect of compatibilizers on the mechanical properties of polypropylene and polycarbonate (PP/PC) composites. Design/methodology/approach For this purpose, three different deposition modes for PP/PC composites with or without compatibilizers were used for the FDM method and tested for tensile properties. Also, parts with the same materials were made by injection molding and used for comparison. In addition, different deposition speeds were used to investigate the different deposition-induced effects. Furthermore, the behavior of the mechanical properties was clarified with scanning electron microscope images of the fracture surfaces. Findings The research results suggest that the deposition orientation has a significant influence on the mechanical behavior of PP/PC composite FDM parts. The results also indicate that there is a close relationship between the mechanical properties and morphological structures which are deeply influenced by compatibilization. Compared with injection molded parts, the ductility of the FDM parts can be dramatically improved due to the formation of fibrils and micro-fibrils by the deposition induced during processing. Originality/value This is the first paper to investigate a PP/PC composite FDM process. The results of this paper verified the applicability of PP/PC composites to FDM technology. It is also the first time that the deposition-induced effect during FDM has been investigated and studied.

On the role of different annealing heat treatments on mechanical properties and microstructure of selective laser melted and conventional wrought Ti-6Al-4V

2017 ◽  
Vol 23 (2) ◽  
pp. 295-304 ◽  
Author(s):  
AmirMahyar Khorasani ◽  
Ian Gibson ◽  
Moshe Goldberg ◽  
Guy Littlefair
Keyword(s):  
Mechanical Properties ◽  
Design Methodology ◽  
Stress Relief ◽  
Heat Treatments ◽  
Recrystallization Annealing ◽  
Content Type ◽  
Hardness Increase ◽  
As Stress ◽  
Different Characteristics

Purpose The purpose of this study was to conduct various heat treatments (HT) such as stress relief annealing, mill annealing, recrystallization (α + β) annealing and β annealing followed by furnace cooling (FC) that were implemented to determine the effect of these on mechanical properties and the microstructure of selective laser melted and wrought samples. The mentioned annealings have been carried out to achieve the related standards in the fabrication of surgery implants. Design/methodology/approach In this paper, based on F2924-14 ASTM standard SLM and conventionally wrought parts were prepared. Then HT was performed and different characteristics such as microstructure, mechanical properties, macro-hardness and fracture surface for selective laser melted and wrought parts were analysed. Findings The results show that the high cooling rate in selective laser melting (SLM) generates finer grains. Therefore, tensile strength and hardness increase along with a reduction in ductility was noticed. Recrystallization annealing appears to give the best combination of ductility, strength and hardness for selective laser melted parts, whilst for equivalent wrought samples, increasing HT temperature results in reduction of mechanical properties. Originality/value The contributions of this paper are discussing the effect of different annealing on mechanical properties and microstructural evolution based on new ASTM standards for selective laser melted samples and comparing them with wrought parts.

Optimization of the color fastness and mechanical properties of pigment dyed PC fabric

2018 ◽  
Vol 47 (5) ◽  
pp. 396-405
Author(s):  
Abdul Azeem ◽  
Sharjeel Abid ◽  
Noman Sarwar ◽  
Shahzaib Ali ◽  
Ahsan Maqsood ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Design Methodology ◽  
Industrial Process ◽  
Color Fastness ◽  
Content Type ◽  
Washing Fastness ◽  
Market Values ◽  
Dyed Fabrics ◽  
Bending Length ◽  
Practical Implications

Purpose The purpose of this study is to improve the mechanical properties and reduce the stiffness/harshness of fabric associated with the pigment dyeing of textiles. Design/methodology/approach The fabric was pigment dyed with the addition of three different softeners and binders. The fabric was then analyzed to have improved textile properties by measuring tear strength, bending length, crocking and washing fastness tests. Findings The conventional route of pigment dyeing (without any softener) imparted poor mechanical and rubbing fastness. The softener-added recipe provided better mechanical, rubbing and washing fastness, and the stiffness values were oppressed as well. Practical implications Because of reduced stiffness, increased fastness and mechanical properties, the use of softener with pigment dyeing can improve the market values and satisfaction of the dyed fabrics. The finished product would also have better life and endurance. The process can be modified easily to have a better end-product with a negligible cost addition in industrial process, as softeners are cheap and used in low (10-20 g/l) in industrial settings without affecting the required shades. Originality/value This is the first report, to the best of the author’s knowledge, on the optimization of pigment dyeing of PC fabric with the addition of Helizarin and perapret softeners in dyeing bath.

Innovation in infrastructure projects: an Australian perspective

2016 ◽  
Vol 8 (2) ◽  
pp. 113-132 ◽  
Author(s):  
Soroush Maghsoudi ◽  
Colin Duffield ◽  
David Wilson
Keyword(s):  
Project Management ◽  
Design Methodology ◽  
New Products ◽  
Project Managers ◽  
Lessons Learned ◽  
Risk Averse ◽  
Infrastructure Projects ◽  
Content Type ◽  
Design Project ◽  
Effective Implementation

Purpose Unlike manufacturing and research and developments, major infrastructure projects rarely emphasize or drive their objectives on the basis of innovation. This is in part because of a risk-averse culture, yet conceivably great benefits and opportunities are being lost because of this behavior. Design/methodology/approach The case for focusing on innovation in infrastructure projects is that the reasons driving innovation are not fully understood, and this impedes the effective implementation of lessons learned for the numerous innovative projects into practice more generally. The purpose of this study was to discover how innovation is produced and captured in major infrastructure projects in Australia and to understand how innovation may be replicated for future projects through refinement of design, project management, finance and procurement. Findings Engineering and project managers may find this paper helpful to better understand how innovation might happen in infrastructure projects and what different forms it can take. Originality/value The findings of this study demonstrate that people and culture drive consistent successful infrastructure outcomes more than simply the development of new products or processes.

Evaluation and prediction of material fatigue characteristics under impact loads: review and prospects

2022 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Xintian Liu ◽  
Que Wu ◽  
Shengchao Su ◽  
Yansong Wang
Keyword(s):  
Mechanical Properties ◽  
Design Methodology ◽  
Mechanical Performance ◽  
Impact Load ◽  
Impact Loads ◽  
Content Type ◽  
Material Fatigue ◽  
Mechanical Properties Of Materials ◽  
Fatigue Characteristics ◽  
Properties Of Materials

PurposeThe properties of materials under impact load are introduced in terms of metal, nonmetallic materials and composite materials. And the application of impact load research in biological fields is also mentioned. The current hot research topics and achievements in this field are summarized. In addition, some problems in theoretical modeling and testing of the mechanical properties of materials are discussed.Design/methodology/approachThe situation of materials under impact load is of great significance to show the mechanical performance. The performance of various materials under impact load is different, and there are many research methods. It is affected by some kinds of factors, such as the temperature, the gap and the speed of load.FindingsThe research on mechanical properties of materials under impact load has the characteristics as fellow. It is difficult to build the theoretical model, verify by experiment and analyze the data accumulation.Originality/valueThis review provides a reference for further study of material properties.

scholarly journals Balancing deterrence: Iran-Israel relations in a turbulent Middle East

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Nora Maher
Keyword(s):  
Middle East ◽  
National Security ◽  
Design Methodology ◽  
Main Approach ◽  
Content Type ◽  
East Region ◽  
Regional Dynamics ◽  
Central Argument ◽  
The Arab Spring ◽  
Middle East Region

Purpose This paper aims to examine the regional dynamics that further consolidated Israel’s national security in the Middle East in the aftermath of the Arab Spring, reflecting upon the nuclear challenge between Iran and Israel and Iran's expanding activities in the region. Design/methodology/approach To prove the central argument, the study uses a conceptual framework that centers on deterrence as the main approach used by states to consolidate their influence in the Middle East region. Findings Iran's nuclear progress and influence in the region has strengthened Israel’s security and fostered an unprecedented open rapprochement led by USA efforts with the Gulf regimes. Originality/value The paper draws particular attention to the Iran–Israel nuclear competency, and the Israeli preferred policy options regarding Iranian activities in the region amid turbulent Middle East. In addition, the paper offers insight to the regional dynamics that further consolidated Israel’s national security in the region while maintaining a status of Arab vulnerability and backwardness.

House financing: contracts used by Islamic banks for finished properties in Malaysia

2020 ◽  
Vol 11 (1) ◽  
pp. 168-178 ◽  
Author(s):  
Aishath Muneeza ◽  
Muhammad Fahmi Fauzi ◽  
Muhammad Faisal Bin Mat Nor ◽  
Mohamed Abideen ◽  
Muhammed Maher Ajroudi
Keyword(s):  
Research Finding ◽  
Design Methodology ◽  
Banking Industry ◽  
New Products ◽  
Islamic Banking ◽  
Islamic Banks ◽  
Modus Operandi ◽  
Content Type ◽  
Secondary Sources ◽  
Insight Into

Purpose The purpose of this paper is to find out the existing practices of the Islamic banks in providing financing to the customers who have a requirement to purchase a finished property and to examine the existing products used by the Islamic banks in this regard by providing an insight into the modus operandi of these products. In doing this, attempt is made to find out the most famous product offered by the Islamic banks in this regard and to find out whether in reality, Malaysian Islamic banking industry has moved away from Bai Bithaman Ajil (BBA) or not. Design/methodology/approach This is a qualitative research, largely library-based, and it will consist of secondary sources such as books, journals, articles and other sources related to the Islamic house financing in Malaysia for finished properties. Recent information of the practises of the banks in this regard is obtained from the official websites of the banks. Findings It is found from this study that majority of Islamic Banks in Malaysia prefer to use the Commodity Murabahah facility for finished property. This finding contradicts with the observations made by some scholars who state that in Malaysia, BBA was initially used, and nowadays, the use of Musharakah Mutanaqisah is more common. The reason why Commodity Murbahah has gained popularity is because of the fact that via the Bursa Suq Al Sila platform, it is easy, swift, reliable, profitable, cheaper, convenient and has zero risk to do this type of transaction at the comfort of the office. It is recommended in this paper to use Musharakah Mutanaqisah, as this contract is an innovative contract that is classified as an equity contract under shariah where risk is shared between the parties. There is need to conduct further research to implement Musharakah Mutanaqisah in Malaysia, specifically to reduce the risk that Islamic Banks will bear by practicing this contract. Originality/value The findings of this paper might create confusion among readers, as some may perceive that the finding of the paper is not new as BBA has been dominating Islamic house financing industry from the inception of Islamic banking in the country, and BBA and Murabahah are similar in nature, and as such, commodity Murabahah is also a Murabahah transaction. The reality that needs to be understood is that the way BBA was or is practised in Malaysia in relation to Islamic house financing is that in the name of BBA, the transaction actually followed the Bai’ ‘inah contract, which is a controversial contract among the shariah scholars. Likewise, commodity Murabahah is also a different contract than Murabahah, as it actually refers to tawarruq. As such, this research finding is important to the Islamic banking industry to understand that Malaysia has moved away from the Bai’ ‘inah contract practised in the name of BBA in Islamic house financing, and there are new products introduced by the Islamic banks in Malaysia to replace this practice which were criticised by Shariah scholars.

Successful rebounds: how firms overcome their middle age crisis

2018 ◽  
Vol 39 (3) ◽  
pp. 3-8
Author(s):  
Candace Ten Brink ◽  
Betsy D. Gelb ◽  
Robert Keller
Keyword(s):  
Design Methodology ◽  
New Products ◽  
Published Data ◽  
Regression Analyses ◽  
Organizational Changes ◽  
Content Type ◽  
Technology Firms ◽  
Industry Performance ◽  
Performance Decline ◽  
Practical Implications

Purpose This paper aims to examine technology-based firms that successfully turned around a decline in performance, to report what they did and what characterized the firms themselves, relating those actions and characteristics to effective rebounds. Design/methodology/approach The authors use published data, including financial data, to examine 59 successful rebounds, and then apply regression analyses to relate firm actions and characteristics to performance. Findings Strategic moves by these firms included layoffs, new products and new inter-company relationships. However, none of those actions predicted rebound success, either individually or in combination. Successful rebounds were associated only with smaller size and a deeper decline – from exceeding the industry performance median to falling far below it. Research limitations/implications Technology firms may or may not represent all middle-aged companies in terms of authors’ implications, that a one-size-fits-all turnaround formula is unavailable. Practical implications Wise managers will therefore consider various scenarios to prepare for decline and test several if possible. Further, the finding that dramatic drops in performance are associated with successful rebounds should warn managers who think that a competitor’s major problems mean they will disappear; they may be likelier to rebound than a competitor experiencing only a mild performance decline. Originality/value Managers who think they have THE answer to decline can profit from the news that one cannot count on layoffs, on new products or on new relationships to turn around performance decline. And, the small-is-beautiful (for rebounds) result suggests rethinking the assumption that bigger is better and making organizational changes in large organizations to allow them to imitate the flexibility advantages that a smaller firm achieves.

Design and practicability evaluation: a novel platform for fabric steam ironing

2016 ◽  
Vol 28 (4) ◽  
pp. 449-462 ◽  
Author(s):  
Shuaitong Liang ◽  
Xue Mei Ding ◽  
Xiong Ying Wu ◽  
Fan Wu ◽  
Tesfaye Mulu Asmamaw
Keyword(s):  
Level Set ◽  
Flow Rate ◽  
Design Of Experiment ◽  
Design Methodology ◽  
Low Cost ◽  
New Products ◽  
Steam Flow ◽  
Content Type ◽  
Test Platform ◽  
Fabric Materials

Purpose – Smooth appearance of fabrics after ironing with steam, soleplate, ironing speed and their interactions cannot be studied using household ironing machines such as hang steamer and flatiron. The purpose of this paper is to present the design and verification of a simple, low-cost test platform based on the fabric materials hang-ironing factors includes temperature, humidity, ironing speed (time). Design/methodology/approach – This platform achieves adjustable and stable steam flow rate, enabling any ironing speed and any temperature of soleplate below 200°C. Moreover, the whole ironing process is automatically after experiment level set ahead for better observation to the ironing process. Findings – Regression results of the apparatus are stable, statistical significant which is verified by the statistics under design of experiment. Originality/value – It is useful in other aspects such as nozzle test and improvement, new products evaluation and smooth appearance level experiment and test for new ironing product and its research. It is also useful in other aspects such as nozzle test and improvement, new products evaluation and smooth appearance level experiment and test for new ironing product and its research.

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