scholarly journals Hollow-core precast and two-way solid slabs: Cost estimation and time duration comparison

2021 ◽  
Vol 2 (1) ◽  
pp. 29-35
Author(s):  
Osamah Sarhan ◽  
Mahdy Raslan ◽  
Gazi Tallawi
Keyword(s):  
Prestressed Concrete ◽  
Cost Estimation ◽  
Hollow Core ◽  
Construction Time ◽  
Time Duration ◽  
Factors Affecting ◽  
Hollow Core Slab ◽  
Duration Comparison ◽  
The Cost

Time and cost are important factors affecting the successful completion of the construction building project. This study analyses and examines the cost and time comparison of precast and cast-in-situ slabs of a particular building. Taking into account that slab is one of the important structural members, this study will take the hollow core slab in particular which can define as precast prestressed concrete elements contain an empty void inside of it which mostly used for floor, roof slabs and wall panels. The results demonstrate that the precast slab construction time is extremely faster in comparison with the cast-in-situ slab as it took around 31 of working days and 43 days in total after considering the holidays while the precast slab took around 9 working days only and 13 days in total. The results also show that the cast-in-situ slab is inferior in both cost and time duration. As cast-in-situ cost is 3.76 times higher than the precast slab, and the time duration is 3.31 times longer.

Cost Analysis of Carbon Emission Based on Carbon Finance

2014 ◽  
Vol 1065-1069 ◽  
pp. 3030-3034
Author(s):  
Nai Ping Zhu ◽  
Qi Zhao ◽  
Yang Shen
Keyword(s):  
Carbon Emissions ◽  
Cost Estimation ◽  
Carbon Emission ◽  
Cost Control ◽  
Added Value ◽  
Estimation Model ◽  
Factors Affecting ◽  
Cost Estimation Model ◽  
Carbon Finance ◽  
The Cost

For the purpose of encouraging enterprises to save energy and reduce emissions from the internal demand and providing insight and inspiration to future study,this article not only describes the carbon finance coefficient model based on factors related to carbon finance but also establishes cost estimation model of carbon emissions according to the factors affecting the cost of carbon emissions and carbon finance coefficient.The resulted shows that carbon emissions currency cost namely the monetary costs of carbon emissions is the market value and the currency value of carbon emissions cost based on the financial market conditions.The result of the present work introduces that the cost of carbon emission has a correlation with prevention costs,cost control,carbon content,industrial added value,carbon finance index and so on so that governments and enterprises should take some measures such as perfecting carbon finance system and setting up the cost control of system consciousness to reduce the cost of carbon emissions and protect our environment.

Cost Estimation and Security Investment of Security Projects

2018 ◽  
pp. 4849-4861
Author(s):  
Yosra Miaoui ◽  
Boutheina A. Fessi ◽  
Noureddine Boudriga
Keyword(s):  
Cost Estimation ◽  
Data Privacy ◽  
Financial Constraints ◽  
Future Directions ◽  
Security Investment ◽  
Factors Affecting ◽  
Investment Allocation ◽  
The Cost ◽  
Investment Models ◽  
Estimation Models

This chapter aims at examining two main aspects in security project: cost estimation and investment assessment. The characteristics of security projects are stressed on and the importance of adopting management task is determined. In addition, the chapter examines the different cost estimation models developed for security project and discusses the technical and managerial factors affecting the cost estimation and the management of project. In addition, a review of research works directed toward security investment models is determined. In fact, most models have focused on determining the optimal security investment allocation based on budgetary aspect, economic, and financial constraints. Recent models are interested to examine more specific security features when assessing the required investment (e.g. system vulnerabilities, attacks type, risk factors, data privacy, and insurance). finally, the chapter discusses future directions that could be investigated to make available useful models for cost estimation and investment on security projects.

Cost Estimation and Security Investment of Security Projects

2019 ◽  
pp. 166-179
Author(s):  
Yosra Miaoui ◽  
Boutheina A. Fessi ◽  
Noureddine Boudriga
Keyword(s):  
Cost Estimation ◽  
Data Privacy ◽  
Financial Constraints ◽  
Future Directions ◽  
Security Investment ◽  
Factors Affecting ◽  
Investment Allocation ◽  
The Cost ◽  
Investment Models ◽  
Estimation Models

This chapter aims at examining two main aspects in security: cost estimation and investment assessment. The characteristics of security projects are stressed and the importance of adopting management task is determined. In addition, the chapter examines the different cost-estimation models developed for security project and discusses the technical and managerial factors affecting the cost estimation and the management of projects. In addition, a review of research works directed toward security investment models is determined. In fact, most models have focused on determining the optimal security investment allocation based on budgetary, economic, and financial constraints. Recent models are interested to examine more specific security features when assessing the required investment (e.g., system vulnerabilities, attack types, risk factors, data privacy, and insurance). Finally, the chapter discusses future directions that could be investigated to make available useful models for cost estimation and investment on security projects.

scholarly journals ANALYSIS METHOD OF GRADUAL CAST INSITU PROJECT COMPLETION OVERPASS PT. TALENTA BUMI MARABAHAN

CERUCUK ◽  
2021 ◽  
Vol 5 (2) ◽  
pp. 105
Author(s):  
Akhmad Fitriadi
Keyword(s):  
Prestressed Concrete ◽  
Load Capacity ◽  
Concrete Strength ◽  
Maximum Load ◽  
Road Transport ◽  
Class Iii ◽  
Heavy Load ◽  
Project Completion ◽  
The Cost

Overpass project development Marabahan is a CSR (Corporate Social Responsibility) from PT. Talenta Bumi, namely making public care facilities for the security and facilitate road transport and to improve the welfare of society .This project Overpass consists of main bridge prestressed concrete girders with spans of 30 m and bridges using slab pile construction with a total length of 200 m. This study aims to determine the calculation method of the analysis of in situ casts gradually and to determine the method of implementation of the phased-situ cast on Marabahan Overpass project.Analysis of cast insitu method stages in the project completion Overpass PT. Marabahan Earth's talents will be obtained security calculations on the structure of the Overpass. Foundry work first is casting with cast in situ on the crown, after it's done casting method cast in situ stages at the slab to be divided into two stages, namely the first layer 20 cm (half slab) and the second layer 15 cm (top slab) using scaffolding as a scaffold and job formwork with main reinforcement ɸut 22-150 which gradually cast directly on the ground with the popularity chart Fc validation test cylinder '30 MPa and graphs coefficient of concrete strength PBI age 71. For loading on board, the work scaffolding (scaffolding) at the time of cast insitu gradually in the field wearing a scaffold with a heavy load capacity (heavy duty) has a maximum load of 675 kg/bay or 0.675 tons/m2, and using strong wooden scaffolding with wood class III based voltage PKKI 1961 timber permit.Based on the analysis results of calculations using the method of cast insitu gradually, by doing a test trial error with conditional on calculation of security moment of the plan should be greater than the moment of ultimate, then casting the first layer half slab in getting workable with the concrete less than one day the Fc '5 MPa and to stage a second layer using a comparison chart coefficient PBI age compressive strength, obtained Fc' 9.57 MPa to 1.5 days workmanship of the concrete casting. With the trial based on the test results of the concrete age, can accelerate and cut time jobs and can save the cost of the work, such as the cost of the use of formwork and scaffolding usage. suggestednecessary to test the concrete test cylinders for 1 day, 2 days, 3 days, etc,so that getting the maximum test.

scholarly journals A Computational Model for Prestressed Concrete Hollow-Core Slab Under Natural Fire

2019 ◽  
Vol 13 (1) ◽  
Author(s):  
R. Pečenko ◽  
T. Hozjan ◽  
I. Planinc ◽  
S. Bratina
Keyword(s):  
Computational Model ◽  
Prestressed Concrete ◽  
Concrete Slab ◽  
Hollow Core ◽  
Two Phase ◽  
Natural Fire ◽  
Heating And Cooling ◽  
Hollow Core Slab ◽  
Cooling Phase ◽  
Core Concrete

AbstractPerformance-based approach, introducing a new two-phase computational model for determining the response of prestressed hollow-core concrete slab exposed to natural fire including heating and cooling phase, is presented. Firstly, the two-dimensional coupled hygro-thermo-chemical model is used to determine time dependent temperature and moisture field in the characteristic cross-section of the concrete hollow-core slab during fire. In addition, the influence of opening on the temperature distribution over prestressed hollow-core concrete slab is accounted for. Secondly, stress–strain state of prestressed concrete hollow-core slab is determined with a newly developed one-dimensional geometrical and material non-linear model, which includes a slip between concrete and tendon. Temperature dependent mechanical properties of concrete, tendon and bond stiffness are accounted for in the model. Model validation showed that the presented two-phase computational model is suitable for the analysis of prestressed hollow-core concrete slab exposed to natural fire. Furthermore, parametric studies revealed that heat exchange between the concrete section and the opening has a significant influence on the development of temperatures in the slab, particularly in the cooling phase, and consequently also on the development of slab displacements. In addition, it was identified that accounting for the slip between concrete and tendon enables the determination of the bond stress distribution and evaluation of the load bearing capacity of the contact.

PREDICTING COST CONTINGENCY FOR PRIVATE PROJECTS: CASE STUDY IN VIETNAM

2020 ◽  
Vol 43 (01) ◽  
Author(s):  
NGUYEN TUAN KIET ◽  
SOO-YONG KIM ◽  
VAN TRUONG LUU ◽  
LE VAN HUNG ◽  
LE HUU DAT
Keyword(s):  
Cost Estimation ◽  
Construction Projects ◽  
Project Performance ◽  
Project Managers ◽  
Performance Information ◽  
Quality Cost ◽  
Factors Affecting ◽  
Forecasting Method ◽  
The Cost

Actual cost in construction projects has tended to exceed the project budgets. Thus, cost contingency from the initial of the project is the significant budget to complete project activities. Cost contingency is an important element of  cost estimation to protect project stakeholders such as owners, contractors, and architects from the risks of the project. This paper reviewed the previous studies to find the factors affecting cost contingency and proposed a regression model to predict the cost contingency for private projects in Vietnam. Through industry survey, project performance information from a total of 48 private projects in Vietnam was gathered. The research also compared with other studies to have an overview about cost contingency predicting methods. The key benefit of this research is that the project managers can use this model as another forecasting method to get a better quality cost management. The further research can be focused on developing the model for other project types in Vietnam.

scholarly journals Distribution of Load Forces in Hollow Core Slabs of Precast Solid Floor Supported on Bearing Walls

2019 ◽  
Vol 18 (2) ◽  
pp. 93-103
Author(s):  
S. V. Bosakov ◽  
A. I. Mordich ◽  
A. A. Karyakin ◽  
S. A. Sonin ◽  
I. S. Derbentsev
Keyword(s):  
Hollow Core ◽  
Load Bearing ◽  
Solid Plate ◽  
Hollow Core Slab ◽  
Building Wall ◽  
Labor Inputs ◽  
Full Scale Tests ◽  
Thrust Forces ◽  
Bearing System

The need to cut construction cost of residential and public buildings and provide them with a free and transformable planning structure during their operation cause interest in building wall systems with a large step of bearing walls. In order to reduce labor inputs and increase rate of construction in such building load-bearing system it is also necessary to maximize the use of large-sized prefabricated products and minimize consumption of in-situ concrete. In this case prefabricated products should be substituted according to the conditions of local (regional) construction industry base and volume of in-situ concrete must be sufficient to ensure a complete redistribution of internal forces between elements of the bearing system under load. As for the described bearing wall system of a multi-storey building the paper presents a flat precast solid floor formed by hollow-core slabs and monolithic crossbars supported by load-bearing walls. The hollow-core slabs supported at the ends on cast-in-place crossbars in the planes of bearing walls are arranged in dense groups between cast-in-place braced cross-beams. Dense contacts between overlapping elements are fixed by internal bonds. New data on distribution of forces in floor elements under the action of a vertical load have been obtained on the basis of full-scale tests and existing theoretical assumptions. It has been established that due to this load reactive thrust forces ensuring an operation of every hollow-core slab group in the floor as an effective solid plate supported along the contour have been originated in the floor plane along two main axes. Calculation of the reactive thrust forces makes it possible more accurately to assess a load-bearing capacity and rigidity of the precast solid floor and to increase a step of bearing walls up to 8 m and more while having hollow-core slabs with a thickness of 220 mm.

IDENTIFICATION OF THE KEY FACTORS FOR ACCURATE LIFE-CYCLE COST ESTIMATION FOR CONSTRUCTION

2014 ◽  
Vol 1 (1) ◽  
Author(s):  
Ayedh Alqahtani ◽  
Andrew Whyte
Keyword(s):  
Life Cycle ◽  
Cost Estimation ◽  
Life Cycle Cost ◽  
Prediction Models ◽  
Key Factors ◽  
Plant Resources ◽  
Factors Affecting ◽  
Low Visibility ◽  
The Cost ◽  
Cost Factors

A major limitation of Life-Cycle Cost (LCC) estimation/prediction modelling is the current typical reliance only on those factors that can be readily quantified and come easily to hand. While estimation of the cost of the most common labor, material and plant resources receive consideration because of their high visibility factor, there are several non-cost factors (low visibility factors) affecting the estimate that are often overlooked and, it is argued here, require equal consideration in estimation processes that seek optimum accuracy. Unfortunately, such (low-visibility) factors are neglected or ignored by current prediction models. Identification of these non-cost factors (low visibility factors) affects LCC estimate accuracy and can improve estimation process confidence. This paper critically reviews secondary research on identification of these important non-cost factors and subsequently determines their influence on the accuracy level(s) of construction cost estimation.

scholarly journals THE EFFICIENCY ANALYSIS OF FOUNDATIONS FOR BUILDINGS WITH BEARING WALLS FOR LITHUANIAN SOIL CONDITIONS

2014 ◽  
Vol 20 (6) ◽  
pp. 893-898
Author(s):  
Saulius Sušinskas ◽  
Zenonas Turskis ◽  
Andrius Stasiškis ◽  
Jonas Valickas ◽  
Žymantas Rudžionis
Keyword(s):  
Residential Buildings ◽  
Soil Conditions ◽  
Life Cycle Costs ◽  
Construction Time ◽  
In Situ Investigation ◽  
The Cost ◽  
Selection Of ◽  
Mode Of Production

The paper deals with selection of foundations for bearing walls of residential buildings depending on the strength of soil and taking into account the economic benefit. Based on in-situ investigation of soil conditions in different Lithuanian regions and construction technologies, it was found that the cost of foundations comprise 2.5–6% of total costs, and takes up 6–10% of construction time. Strip and pile foundations were analysed taking into account dimensions and mode of production. The proposed case study model enables to save up to 30–50% of foundation costs. It has a significant influence on entire life cycle costs of.

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