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An Investigation into Factors Causing Delays in Road Construction Projects in Kenya
Issue:
Volume 3, Issue 3, May 2015
Pages:
51-63
Received:
12 March 2015
Accepted:
29 March 2015
Published:
9 April 2015
Abstract: The majority of road construction projects in Kenya do not get completed within the initially set targets of time. Project delays frustrate the process of development, have an immeasurable cost implication to the society, and also lead to loss of reputation of the parties involved in the projects’ execution. The purpose of this study was to investigate the factors causing delays in road construction projects in Kenya. Project delays are a common problem internationally in the construction industry in modern times. Investigating the reasons for delay has become an important contribution to improved construction industry performance. Over seventy percent of projects initiated in Kenya are likely to escalate in time with a magnitude of over fifty percent. The study used purposive sampling technique and survey design. Data was collected using questionnaires which were distributed to consultants and contractors. The data was analyzed using the Relative Importance Index and Spearman’s rank correlation. The top five causes of project delays were observed to be payment by client, slow decision making and bureaucracy in client organization, inadequate planning and scheduling, and rain. It is recommended that clients should improve their financial management systems so that they are able to pay contractors in a timely manner. Bureaucracy and red tape should be reduced in client organizations in order to speed up the slow decision making process. Efficient management of the construction process will also lead to a reduction in incidences of claims. Contractors should prepare adequate plans and schedules which can also be used to minimize the effects of rain.
Abstract: The majority of road construction projects in Kenya do not get completed within the initially set targets of time. Project delays frustrate the process of development, have an immeasurable cost implication to the society, and also lead to loss of reputation of the parties involved in the projects’ execution. The purpose of this study was to investi...
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Experimental Analysis of Seepage in Soil Beneath a Model of a Gravity Dam
Najm Obaid Salim Alghazali,
Hala Kathem Taeh Alnealy
Issue:
Volume 3, Issue 3, May 2015
Pages:
64-69
Received:
23 March 2015
Accepted:
1 April 2015
Published:
9 April 2015
Abstract: In this research the experimental method by using Hydraulic modeling used to determination the flow net in order to analyses seepage flow through single- layer soil foundation underneath hydraulic structure. As well as steady the consequence of the cut-off inclination angle on exit gradient, factor of safety, uplift pressure and quantity of seepage by using seepage tank were designed in the laboratory with proper dimensions with two cutoffs. The physical model (seepage tank) was designed in two downstream cutoff angles, which are (90, and 120°) and upstream cutoff angles (90, 45, 120°). After steady state flow the flow line is constructed by dye injection in the soil from the upstream side in front view of the seepage tank, and the equipotential line can be constructed by piezometer fixed to measure the total head. From the result It is concluded that using downstream cut-off inclined towards the downstream side with Ө equal 120º that given value of redaction (25%) is beneficial in increasing the safety factor against the piping phenomenon. Using upstream cut-off inclined towards the downstream side with Ө equal 45º that given value of redaction (52%) is beneficial in decreasing uplift pressure and quantity of seepage.
Abstract: In this research the experimental method by using Hydraulic modeling used to determination the flow net in order to analyses seepage flow through single- layer soil foundation underneath hydraulic structure. As well as steady the consequence of the cut-off inclination angle on exit gradient, factor of safety, uplift pressure and quantity of seepage...
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Lean Construction in Civil Engineering and Project Management: Case Study Analysis of UT Arlington College Park
Issue:
Volume 3, Issue 3, May 2015
Pages:
70-74
Received:
12 March 2015
Accepted:
3 April 2015
Published:
14 April 2015
Abstract: Lean development method, which has been applied extensively in the manufacturing industry, holds enormous potential for the construction industry as well. Projects in the construction segments are complex with both financial level and work level risks. This research critically analyzes the benefits in using lean methods in construction. The lean construction management called the Last Planner System is applied here. The research uses a case study methodology, the case study of UT Arlington College Park Constructions are selected. The Last Planner system and its techniques are applied to Case Study. The benefits of the Last Planner implementation are proved by the recorded PPC value before and after implementation of the last planner system. The PPC values increased. This research concludes that Last Planner system must be further investigated for benefits in Civil Engineering and Project Management, and also recommends it use in Construction Projects.
Abstract: Lean development method, which has been applied extensively in the manufacturing industry, holds enormous potential for the construction industry as well. Projects in the construction segments are complex with both financial level and work level risks. This research critically analyzes the benefits in using lean methods in construction. The lean co...
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Project Risk Management: Methodology Development for Engineering, Procurement and Construction Projects a Case Study in the Oil and Gas Industry
Issue:
Volume 3, Issue 3, May 2015
Pages:
75-79
Received:
19 March 2015
Accepted:
3 April 2015
Published:
14 April 2015
Abstract: EPC Project comes with a set of risks that are unique and hence cannot be addressed in the context of general construction risks. This paper researches existing methodologies and presents a customizable framework for project risks assessment with EPC project. A case study specific to the Oil and Gas industry has been used. The developed framework is also extendable for other EPC works.
Abstract: EPC Project comes with a set of risks that are unique and hence cannot be addressed in the context of general construction risks. This paper researches existing methodologies and presents a customizable framework for project risks assessment with EPC project. A case study specific to the Oil and Gas industry has been used. The developed framework i...
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Determination the Flow Net through Multi Layers Soil by Using the Hydraulic Modeling Method
Issue:
Volume 3, Issue 3, May 2015
Pages:
80-87
Received:
15 April 2015
Accepted:
27 April 2015
Published:
9 May 2015
Abstract: In this research the experimental method by using Hydraulic modelingused todetermination the flow net in order to analyses seepage flow through multi- layer soil foundation underneath hydraulic structure.as well as steady theconsequence ofthe cut-off inclination angle on exit gradient, factor of safety, uplift pressure and quantity of seepage by using seepage tank were designed in the laboratory with proper dimensions with two cutoffs. The physical model (seepage tank) was designed in two downstream cutoff angles, which are (90, and 120°) and upstream cutoff angles (90, 45, 120°). After steady state flow the flow line is constructed by dye injection in the soil from the upstream side in front view of the seepage tank, and the equipotential line can be constructed by piezometer fixed to measure the total head. From the result It is concluded that using downstream cut-off inclined towards the downstream side with Ө equal 90º that given value of redaction (25%) is beneficial in increasing the safety factor against the piping phenomenon.using upstream cut-off inclined towards the downstream side with Ө equal 90º that given value of redaction (31%) is beneficial in decreasing uplift pressure and quantity of seepage.
Abstract: In this research the experimental method by using Hydraulic modelingused todetermination the flow net in order to analyses seepage flow through multi- layer soil foundation underneath hydraulic structure.as well as steady theconsequence ofthe cut-off inclination angle on exit gradient, factor of safety, uplift pressure and quantity of seepage by us...
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Effect of Using Waste Material as Filler in Bituminous Mix Design
Dipu Sutradhar,
Mintu Miah,
Golam Jilany Chowdhury,
Mohd. Abdus Sobhan
Issue:
Volume 3, Issue 3, May 2015
Pages:
88-94
Received:
18 February 2015
Accepted:
12 April 2015
Published:
16 May 2015
Abstract: Bituminous concrete or asphaltic concrete is one of the highest and costliest types of flexible pavement layers used in surface course. Being of high cost specifications, the bituminous mixes are properly designed to satisfy the design requirements of the stability and durability. The mixture contains dense grading of coarse aggregate, fine aggregate and mineral filler coated with bitumen binder. The mineral filler passing through 0.075 mm sieve performs some important roles in bituminous mixes. Marshall Stability of bituminous mix increases as the amount of filler increases. The Asphalt Institute recommends the use of 4 to 8% filler in asphalt concrete. The common filler materials like cement, lime stone, granite powder etc. is not easily and economically available in Bangladesh. Waste concrete dust and brick dust are considered to be cheaper and in abundant supply in Bangladesh. In this study an attempt is made to find the effect of types of filler on the behavior of bituminous mixes. According the properties of bituminous mixes containing filler like waste concrete dust and brick dust is studied and compared with the mixes containing filler like fine sand and stone dust mixture generally used. The Marshall method of mix design was used for the comparison. The Marshall stabilities of mix types containing filler fine sand and stone dust mixture, waste concrete dust and brick dust were found 9.8 KN, 11.1 KN and 11.3 KN respectively which satisfy the limiting value of 5.33 KN according to Marshall Design criteria. The study indicates the possibility of using waste concrete dust and brick dust as filler in bituminous mix.
Abstract: Bituminous concrete or asphaltic concrete is one of the highest and costliest types of flexible pavement layers used in surface course. Being of high cost specifications, the bituminous mixes are properly designed to satisfy the design requirements of the stability and durability. The mixture contains dense grading of coarse aggregate, fine aggrega...
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