scholarly journals A Study on the Modified Cement-Based Crack Injection Materials

Impact ◽  
2020 ◽  
Vol 2020 (4) ◽  
pp. 49-51
Author(s):  
Wei-Chung Yeih
Keyword(s):  
Marine Environments ◽  
Infrastructure Projects ◽  
Concrete Repair ◽  
Building Projects ◽  
Dangerous Situation ◽  
Concrete Building ◽  
Injection Materials

Human constructed harbours are large infrastructure projects that use cement to reinforce embankments and build protective walls. However, like all concrete building projects maintenance is required. Cracks form and if left unattended will grow, eventually leading to a dangerous situation where a structure's integrity is compromised. As a result, the concrete repair industry, particularly in relation to marine infrastructure, is a large one and various mixtures of cement and other materials are designed to fill these cracks. Researchers at the National Taiwan Ocean University in Taiwan are now investigating the best ways to design injectable materials to repair cement cracking in a marine setting in order to develop new cement recipes that will work in marine environments and protect vital harbours from deterioration.

scholarly journals Assessing and Prioritising Delay Factors of Prefabricated Concrete Building Projects in China

2018 ◽  
Vol 8 (11) ◽  
pp. 2324 ◽  
Author(s):  
Yingbo Ji ◽  
Lin Qi ◽  
Yan Liu ◽  
Xinnan Liu ◽  
Hong Li ◽  
...  
Keyword(s):  
Decision Making ◽  
Construction Industry ◽  
Construction Projects ◽  
Analytic Network Process ◽  
Building Projects ◽  
Factors Affecting ◽  
Expert Interview ◽  
Concrete Building ◽  
Network Process ◽  
Improved Performance

Prefabricated construction has been widely accepted as an alternative to conventional cast-in-situ construction, given its improved performance. However, prefabricated concrete building projects frequently encounter significant delays. It is, therefore, crucial to identify key factors affecting schedule and explore strategies to minimise the schedule delays for prefabricated concrete building projects. This paper adopts the decision-making trial and evaluation laboratory (DEMATEL) model and analytic network process (ANP) method to quantify the cause-and-effect relationships and prioritise the key delay factors in terms of their importance in the Chinese construction industry. The DEMATEL model evaluates the extent to which each factor impacts other factors. The quantified extents are then converted into a prioritisation matrix through ANP. The delay factors of prefabricated construction projects are selected and categorised based on a literature review and an expert interview. Questionnaires are then implemented to collect the data. The results reveal that the issue of inefficient structural connections for prefabricated components is found to be the most significant factor and most easily affected by other delay factors. This research also suggests prioritising major delay factors, such as ‘lack of communication among participants’ and ‘low productivity’, in the Chinese construction industry during scheduling control. Overall, this research contributes an assessment framework for decision making in the scheduling management of prefabricated construction.

scholarly journals STUDI IDENTIFIKASI RISIKO PADA PROYEK INFRASTRUKTUR DI INDONESIA

2021 ◽  
Vol 4 (1) ◽  
pp. 295
Author(s):  
Wilwin Wilwin ◽  
Arianti Sutandi
Keyword(s):  
Implementation Process ◽  
Risk Identification ◽  
Transportation Infrastructure ◽  
Infrastructure Projects ◽  
Literature Study ◽  
Building Projects ◽  
Identification Method ◽  
Infrastructure Project ◽  
Potential Risks

Infrastructure projects such as buildings and transportation infrastructure have many risks and uncertainties in the implementation process. To minimize this risk, it is necessary to apply risk management in project implementation. In this study, a literature study was conducted to analyze the risk identification methods and potential risks involved in Indonesia's infrastructure projects. An analysis was conducted by comparing the risk identification method and the risk potential in the infrastructure project risk journal collected using the basic mathematic method. Based on research, the most widely discussed identification method is the questionnaire. Furthermore, a risk comparison was carried out in the 2 most discussed categories. The checklist method was carried out so that the material and equipment, and humans were obtained as the most discussed category. The results showed that in building projects, the most discussed risk was the increase in material prices (71%) in the material and equipment category and labor accidents (86%) in the human category. Meanwhile, in transportation infrastructure projects, the most discussed risks were unavailability or shortage of material (67%) in the material and equipment category and the low quality of labor (83%) in the human category. ABSTRAK Proyek infrastruktur seperti bangunan gedung dan prasarana transportasi memiliki banyak risiko dan ketidakpastian dalam proses pelaksanaannya. Untuk meminimalkan risiko tersebut perlu diterapkannya manajemen risiko didalam pelaksanaan proyeknya. Dalam penelitian ini dilakukan studi literatur untuk menganalisa metode identifikasi risiko dan potensi risiko yang terdapat pada proyek infrastruktur di Indonesia. Dilakukan analisa dengan melakukan perbandingan metode identifikasi risiko dan potensi risiko pada jurnal risiko proyek infrastruktur yang telah dikumpulkan menggunakan metode matematis sederhana. Berdasarkan penelitian, metode identifikasi yang paling banyak dibahas adalah kuisioner. Selanjutnya dilakukan perbandingan risiko pada 2 kategori yang paling banyak dibahas, penentuan kategori ini dilakukan dengan metode checklist sehingga didapatkan kategori material dan peralatan, dan manusia sebagai kategori yang paling banyak dibahas. Hasil penelitian menunjukkan bahwa pada proyek bangunan gedung, risiko yang paling banyak dibahas adalah kenaikan harga material (71%) pada kategori material dan peralatan dan kecelakaan tenaga kerja (86%) pada kategori manusia. Sedangkan pada proyek prasarana transportasi, risiko yang paling banyak dibahas adalah tidak tersedianya atau kekurangan material (67%) pada kategori material dan peralatan dan rendahnya kualitas tenaga kerja (83%) pada kategori manusia.

‘Grey Dawn’ in the British Pacific: Race, Security and Colonial Sovereignty on the Eve of World War I

2016 ◽  
Vol 9 (1) ◽  
pp. 32-54 ◽  
Author(s):  
Jesse Tumblin
Keyword(s):  
Twentieth Century ◽  
World War I ◽  
Military Force ◽  
Royal Navy ◽  
World War ◽  
Building Projects ◽  
Cooperative Security ◽  
Strategic Defense ◽  
Racial Discourses ◽  
The Way

This article examines the way a group of colonies on the far reaches of British power – Australia, New Zealand, Canada, and India, dealt with the imperatives of their own security in the early twentieth century. Each of these evolved into Dominion status and then to sovereign statehood (India lastly and most thoroughly) over the first half of the twentieth century, and their sovereignties evolved amidst a number of related and often countervailing problems of self-defence and cooperative security strategy within the British Empire. The article examines how security – the abstracted political goods of military force – worked alongside race in the greater Pacific to build colonial sovereignties before the First World War. Its first section examines the internal-domestic dimension of sovereignty and its need to secure territory through the issue of imperial naval subsidies. A number of colonies paid subsidies to Britain to support the Royal Navy and thus to contribute in financial terms to their strategic defense. These subsidies provoked increasing opposition after the turn of the twentieth century, and the article exlpores why colonial actors of various types thought financial subsidies threatened their sovereignties in important ways. The second section of the article examines the external-diplomatic dimension of sovereignty by looking at the way colonial actors responded to the Anglo-Japanese Alliance. I argue that colonial actors deployed security as a logic that allowed them to pursue their own bids for sovereignty and autonomy, leverage racial discourses that shaped state-building projects, and ultimately to attempt to nudge the focus of the British Empire's grand strategy away from Europe and into Asia.

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