scholarly journals ANALISIS FAKTOR-FAKTOR YANG MEMPENGARUHI WAKTU TUNGGU PENGADAAN MATERIAL KONSTRUKSI PADA PROYEK GEDUNG DI KABUPATEN BADUNG

2016 ◽  
Vol 4 (2) ◽  
Author(s):  
Putera Kumarayasa Mudita ◽  
I K. Sudarsana ◽  
Mayun Nadiasa
Keyword(s):  
Lead Time ◽  
Construction Projects ◽  
Large Scale ◽  
Construction Material ◽  
Dominant Factor ◽  
Building Projects ◽  
Project Completion ◽  
Factor I ◽  
Material Procurement ◽  
Material Transportation

Abstract :When undertaking construction projects, the smoothflow of materials to the project site must be maintained.Waiting for material, which frequently happens, will have a big impact, especially for large-scale projects that use a lot of labor. If the arrival of the materials is not in accordance with the schedule of material procurement planning, the workers will have nothing to do and the project cost will blow out and there will be delays in project completion time. This research investigates the factors which influence the lead time of construction material procurement in the Badung Regency. Data was obtained by distributing a questionnaire to 50 respondents. A research sample was obtained by purposive sampling aimed at the experts who work on building projects in the Badung regency. Before being used as a research instrument, the questionnaire was tested for the validity of data by using the Pearson Product-Moment correlation and its reliability was tested using the Cronbach alpha method. Processing and data analysis was conducted by Factor Analysis. The research results show there are twenty four variables identified that influence the lead time of construction material procurement on building projects in the Badung regency. All variables can be grouped into seven factors (Factor I, II, III, IV, V, VI, VII). The most dominant factor reviewed based on the percent of variance is Factor I which is formed by six variables being the material production process at the suppliers, the relationships between contractors and suppliers, a lack of material stock at the suppliers, the availability of material transportation, access to the project, and extreme topography.

Estimating the cost of capital projects: an empirical study of accuracy levels for municipal government projects

2002 ◽  
Vol 29 (5) ◽  
pp. 653-661 ◽  
Author(s):  
S M AbouRizk ◽  
G M Babey ◽  
G Karumanasseri
Keyword(s):  
Construction Projects ◽  
Municipal Government ◽  
Construction Costs ◽  
Cost Estimates ◽  
Capital Projects ◽  
Building Projects ◽  
Capital Costs ◽  
Project Completion ◽  
Design Maturity ◽  
Four Levels

This paper highlights the findings of a study undertaken to assess the accuracy of cost estimates for construction projects at various levels of design maturity. Specifically, this paper addresses the accuracy of cost estimates for major types of municipal works including drainage, roadways, and building projects over a span of 3 years. Over 200 projects were statistically evaluated in the study at four levels of the design, namely, concept, preliminary, detailed, and award. Those estimates were then compared with actual incurred cost at project completion. In general, it was found that estimates are not as accurate as generally believed. It was also confirmed that cost estimates for rehabilitation work were less accurate than those for new work. In the absence of major changes to the design and estimation processes, more tempered accuracy limits were derived and proposed.Key words: estimating, budgeting, construction costs, variability in capital costs.

scholarly journals Monumental Structures and Volcanic Activities: Excavating the Campana at San Andrés in the Zapotitán Valley, El Salvador

2021 ◽  
pp. 1-20
Author(s):  
Akira Ichikawa
Keyword(s):  
El Salvador ◽  
Construction Projects ◽  
Construction Material ◽  
Volcanic Eruptions ◽  
Corporate Identity ◽  
Building Projects ◽  
Radiocarbon Dates ◽  
Volcanic Material ◽  
Communal Memory ◽  
San Andres

This article presents stratigraphic data and radiocarbon dates combined with Bayesian modeling from San Andrés in the Zapotitán Valley, El Salvador, focusing on the Campana Structure, the largest and longest-used monumental structure at the site. These data refine the regional chronology of the valley and provide insights into the emergence, development, and abandonment of this pivotal center in southeastern Mesoamerica and its potential links to three related volcanic eruptions: Ilopango, Loma Caldera, and El Boquerón. These distinct volcanic events had pronounced effects on local people who innovated new monumental construction projects and used new volcanic debris as construction material after major eruptions. It is suggested that these monumental public building projects played an important role in the post-disaster recovery of societies by helping foster a sense of corporate identity. The use of volcanic material in constructions at San Andrés and the building of these massive structures may also have helped keep these events alive in the communal memory.

scholarly journals Evaluasi Penerapan Keselamatan Dan Kesehatan Kerja (K3) Pada Proyek Bangunan Gedung Di Kabupaten Cirebon

2017 ◽  
Vol 19 (1) ◽  
pp. 1-8
Author(s):  
Aryati - Indah
Keyword(s):  
Construction Projects ◽  
Large Scale ◽  
Health And Safety ◽  
Selling Price ◽  
Construction Sector ◽  
Building Projects ◽  
Structural Work ◽  
Practical Guidelines ◽  
Survey Approach

The purpose of this study are: 1) evaluating the implementation and constraints of K3 in Building Construction Projects in Cirebon, 2) identifying the differences of implementation in project scale based. The method used survey approach at 10 contractors on 10 two-floors or more building projects in Cirebon. Evaluation component was developed from Practical Guidelines document Occupational Health and Safety in the Construction Sector (ILO, 2005). The study found that the level of K3 implementation on aspects of the personal protective equipment (60%), the role of emergency condition (75%), Structural work, Scaffolding and Ladder (66.7%), Use of Toxic and Dangeorus Materials ( 62.9%), Health and Hygiene of Work Environmental (89.2%). Constraints of K3 implementation in general are budgetary, workers cultural who are not familiar with the K3 implementation and impact of the construction cost and the selling price of the property. Average of K3 implementation in large-scale projects are higher than small and medium-scale projectsTujuan dari penelitian ini adalah: 1) untuk mengevaluasi penerapan dan kendala penerapan K3 pada proyek bangunan gedung di Kabupaten Cirebon, 2) mengetahui perbedaan penerapan K3 berdasarkan skala proyek. Metode penelitian menggunakan pendekatan survei terhadap 10 kontraktor pada 10 proyek bangunan gedung 2 lantai atau lebih di Kabupaten Cirebon. Komponen evaluasi K3 dikembangkan berdasarkan Pedoman Praktis Keselamatan dan Kesehatan Kerja di Bidang Konstruksi (ILO, 2005). Hasil penelitian menemukan bahwa tingkat penerapan K3 pada aspek: penggunaan Alat Pelindung Diri (APD) (60%), Pengelolaan Kondisi Darurat (75%), Pekerjaan Struktur, Perancah dan Tangga (66,7%), Penggunaan Bahan Beracun dan Berbahaya (62,9%), Kesehatan dan Kebersihan Lingkungan Kerja ( 89,2%). Kendala penerapan K3 pada umumnya adalah anggaran, budaya pekerja yang belum terbiasa dengan penerapan K3 serta dampak penerapan terhadap biaya dan harga jual konstruksi properti. Rata-rata penerapan K3 lebih besar pada proyek skala besar dibandingkan proyek skala sedang dan kecil.

Quality cost of material procurement in construction projects

2018 ◽  
Vol 25 (8) ◽  
pp. 974-988 ◽  
Author(s):  
Rema Sawan ◽  
Jwen Fai Low ◽  
Andrea Schiffauerova
Keyword(s):  
Construction Projects ◽  
Construction Material ◽  
Quality Cost ◽  
Content Type ◽  
Procurement Process ◽  
Purchase Order ◽  
Failure Cost ◽  
Material Procurement ◽  
Using Data ◽  
The Cost

Purpose Material procurement constitutes a large share of the overall cost of construction projects. Understanding the factors influencing the cost of quality (COQ) in the procurement process could help identify opportunities for lowering quality cost without compromising quality. The paper aims to discuss these issues. Design/methodology/approach In this paper, a COQ model for the construction material procurement process is developed using the traditional prevention–appraisal–failure (PAF) approach. Using data from a $4bn aluminum smelter construction project, the authors conducted a simulation of the COQ model to evaluate various quality assurance policies. Findings This paper confirms that raising the prevention cost leads to a drop in failure cost as well as COQ for the project studied. While the authors are unable to provide blanket recommendations as the results are derived from a single project case study, it does suggest that construction material procurement processes would benefit from a higher prevention expenditure. And for certain cases where the authors observe a deviation from the traditional Juran’s model of COQ – the high appraisal cost in the procurement process – reduction of appraisal expenditure may in fact be more beneficial than its increase. Originality/value The research results suggest that appraisal expenditure should be tailored to each purchase order in order to maximize the total benefits. Additionally, this paper presents the first COQ model developed for the construction material procurement process. Another unique feature of the model is its inclusion of supplier-side costs, which are excluded in the conventional COQ analysis.

scholarly journals Effect of Different Mineralization Modes on Strengthening Calcareous Sand under Simulated Seawater Conditions

2021 ◽  
Vol 13 (15) ◽  
pp. 8265
Author(s):  
Shiyu Liu ◽  
Bowen Dong ◽  
Jin Yu ◽  
Yanyan Cai ◽  
Xingqian Peng ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Construction Projects ◽  
Construction Material ◽  
X Ray Diffraction ◽  
Calcareous Sand ◽  
Sand Column ◽  
Sporosarcina Pasteurii ◽  
Phosphate Mineralization ◽  
Filling Water ◽  
Simulated Seawater

Calcareous sand, as a blow-fill or construction material, is widely used in island and reef construction projects in marine environments after treatment. When microorganism-induced mineralization is used to strengthen calcareous sand, salinity and other conditions in the marine environment will adversely affect microorganisms or their mineralization process. For this reason, the two environmental conditions created by deionized water and simulated seawater were introduced to explore their effects on the growth and urease activity of Sporosarcina pasteurii. Then, the changes in the permeability and mechanical strength of calcareous sand under different mineralization methods were compared by one-dimensional sand column tests. Finally, the reinforcement mechanism was compared and analyzed based on the results of scanning electron microscopy and X-ray diffraction tests. The results show that Sporosarcina pasteurii can induce carbonate and phosphate precipitation and mineralization to strengthen calcareous sand in simulated seawater. The mineralized products greatly reduce the permeability of calcareous sand and significantly improve the mechanical strength by wrapping calcareous sand particles, filling water seepage channels and cementing adjacent particles. The reinforcement effect of carbonate mineralization is better than that of phosphate mineralization, but phosphate mineralization has less impact on the environment during the treatment process.

A Streamflow and Water Level Forecasting Model for the Ganges, Brahmaputra, and Meghna Rivers with Requisite Simplicity

2018 ◽  
Vol 19 (1) ◽  
pp. 201-225 ◽  
Author(s):  
Wahid Palash ◽  
Yudan Jiang ◽  
Ali S. Akanda ◽  
David L. Small ◽  
Amin Nozari ◽  
...  
Keyword(s):  
Water Level ◽  
Lead Time ◽  
Large Scale ◽  
Predictive Ability ◽  
Large River ◽  
Modeling Framework ◽  
Forecasting Accuracy ◽  
Weather Model ◽  
And Performance ◽  
The Ganges

A forecasting lead time of 5–10 days is desired to increase the flood response and preparedness for large river basins. Large uncertainty in observed and forecasted rainfall appears to be a key bottleneck in providing reliable flood forecasting. Significant efforts continue to be devoted to developing mechanistic hydrological models and statistical and satellite-driven methods to increase the forecasting lead time without exploring the functional utility of these complicated methods. This paper examines the utility of a data-based modeling framework with requisite simplicity that identifies key variables and processes and develops ways to track their evolution and performance. Findings suggest that models with requisite simplicity—relying on flow persistence, aggregated upstream rainfall, and travel time—can provide reliable flood forecasts comparable to relatively more complicated methods for up to 10 days lead time for the Ganges, Brahmaputra, and upper Meghna (GBM) gauging locations inside Bangladesh. Forecasting accuracy improves further by including weather-model-generated forecasted rainfall into the forecasting scheme. The use of water level in the model provides equally good forecasting accuracy for these rivers. The findings of the study also suggest that large-scale rainfall patterns captured by the satellites or weather models and their “predictive ability” of future rainfall are useful in a data-driven model to obtain skillful flood forecasts up to 10 days for the GBM basins. Ease of operationalization and reliable forecasting accuracy of the proposed framework is of particular importance for large rivers, where access to upstream gauge-measured rainfall and flow data are limited, and detailed modeling approaches are operationally prohibitive and functionally ineffective.

Access and Logistics Challenges in Mountain Terrain Pipeline Projects

2014 ◽  
Author(s):  
Mark McDougall ◽  
Ken Williamson
Keyword(s):  
Construction Projects ◽  
Large Scale ◽  
Oil And Gas ◽  
Large Diameter ◽  
Gas Production ◽  
Additional Time ◽  
Oil And Gas Production ◽  
Road Design ◽  
Regulatory Constraints ◽  
The Right

Oil and gas production in Canada’s west has led to the need for a significant increase in pipeline capacity to reach export markets. Current proposals from major oil and gas transportation companies include numerous large diameter pipelines across the Rocky Mountains to port locations on the coast of British Columbia (BC), Canada. The large scale of these projects and the rugged terrain they cross lead to numerous challenges not typically faced with conventional cross-country pipelines across the plains. The logistics and access challenges faced by these mountain pipeline projects require significant pre-planning and assessment, to determine the timing, cost, regulatory and environmental impacts. The logistics of pipeline construction projects mainly encompasses the transportation of pipe and pipeline materials, construction equipment and supplies, and personnel from point of manufacture or point of supply to the right-of-way (ROW) or construction area. These logistics movement revolve around the available types of access routes and seasonal constraints. Pipeline contractors and logistics companies have vast experience in moving this type of large equipment, however regulatory constraints and environmental restrictions in some locations will lead to significant pre-planning, permitting and additional time and cost for material movement. In addition, seasonal constraints limit available transportation windows. The types of access vary greatly in mountain pipeline projects. In BC, the majority of off-highway roads and bridges were originally constructed for the forestry industry, which transports logs downhill whereas the pipeline industry transports large equipment and pipeline materials in both directions and specifically hauls pipe uphill. The capacity, current state and location of these off-highway roads must be assessed very early in the process to determine viability and/or potential options for construction access. Regulatory requirements, environmental restrictions, season of use restrictions and road design must all be considered when examining the use of or upgrade of existing access roads and bridges. These same restrictions are even more critical to the construction of new access roads and bridges. The logistics and access challenges facing the construction of large diameter mountain pipelines in Western Canada can be managed with proper and timely planning. The cost of the logistics and access required for construction of these proposed pipeline projects will typically be greater than for traditional pipelines, but the key constraint is the considerable time requirement to construct the required new access and pre-position the appropriate material to meet the construction schedule. The entire project team, including design engineers, construction and logistics planners, and material suppliers must be involved in the planning stages to ensure a cohesive strategy and schedule. This paper will present the typical challenges faced in access and logistics for large diameter mountain pipelines, and a process for developing a comprehensive plan for their execution.

Software Testing Strategy

2014 ◽  
Vol 6 (2) ◽  
pp. 23-36
Author(s):  
Fatma Molu
Keyword(s):  
Life Cycle ◽  
Large Scale ◽  
Critical Role ◽  
Real Life ◽  
Banking System ◽  
System Transformation ◽  
Financial Systems ◽  
Project Completion ◽  
Basic Features ◽  
Project Life

Complex financial conversion projects with large budgets have many different challenges. For companies that want to survive in conditions of tough competition, legacy (old) systems must continue to provide the required service throughout the project life cycle and in some circumstances even after project completion partly. In this case, the term coexistence comes into prominence. During this period, testing phase takes more critical role while integration systems' complexity and risk amount increase. Determining testing approach to use is essential to make sure both transformed and legacy systems provide service synchronously. In this paper, testing practices applied in the long conversion processes are discussed. Primarily, the basic features of the critical financial systems are addressed and then the main adoption methods in the literature are summarized. Then a variety of testing methodologies are presented depending on those adoption methods. These samples based on real-life experiences of transformation project. The most extensive example of real-time online financial systems is core banking systems. This paper covers the testing life cycle process of the large scale project of core banking system transformation project of a bank in Turkey.

scholarly journals SUBCONTRACTOR SELECTION USING THE INTEGRATION OF THE AHP AND PROMRTHEE METHODS

2015 ◽  
Vol 22 (8) ◽  
pp. 1042-1054 ◽  
Author(s):  
Gul POLAT
Keyword(s):  
Construction Projects ◽  
Selection Process ◽  
Selection Problem ◽  
Preference Ranking ◽  
Analytic Hierarchy ◽  
Building Projects ◽  
Bid Price ◽  
Perform Sensitivity Analysis ◽  
Complete Ranking ◽  
The Right

On many construction projects, especially building projects, 80–90% of the tasks are performed by subcontractors. Since the success of the project highly depends on the performances of the subcontractors, selecting the right subcontractor for the right job is critical. Main contractors generally tend to select the subcontractors that offer the lowest bid price. However, working with unqualified and insufficiently financed subcontractors may result in inefficiencies and failures. Thus, a combination of several compromising and conflicting criteria underpinning financial capacity and competencies of the subcontractors should be considered during the subcontractor selection process. This paper proposes an integrated decision approach, which employs analytic hierarchy process (AHP) and preference ranking organization method for enrichment evaluations (PROMETHEE) together, for the subcontractor selection problem. In the proposed approach, AHP is used to analyze the structure of the subcontractor selection problem and to determine the weights of the criteria, and PROMETHEE is employed to obtain complete ranking and perform sensitivity analysis by changing the weights of criteria. The proposed approach is applied to a problem of selecting the most appropriate subcontractor to be worked with in an international construction project. Company management found the proposed decision approach satisfactory and implementable in future subcontractor selection problems.

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