The Experts below are selected from a list of 34011 Experts worldwide ranked by ideXlab platform
Matthew R Hallowell - One of the best experts on this subject based on the ideXlab platform.
-
integration of safety risk data with Highway Construction schedules
Construction Management and Economics, 2013Co-Authors: Behzad Esmaeili, Matthew R HallowellAbstract:The Construction industry is characterized by a relatively high injury and illness rate compared to other industries. Within the Construction industry, the Highway Construction and maintenance sector is one of the most dangerous. To improve safety in this sector, proactive methods of safety improvement and reliable risk data are needed. The safety risk quantification is the first step towards integrating safety data into design and planning. To enhance the current preConstruction safety practices, safety risks of Highway Construction and maintenance tasks were quantified and a decision support system was developed and tested that integrates safety risk data into the project schedules. Relative safety risks were quantified for 25 common Highway Construction tasks using the Delphi method. To ensure valid and reliable results, experts were selected according to rigorous requirements and multiple controls were employed to decrease cognitive biases. The data were incorporated into a decision support system cal...
-
safety risk interactions among Highway Construction work tasks
Construction Management and Economics, 2011Co-Authors: Matthew R Hallowell, Behzad Esmaeili, Paul ChinowskyAbstract:Recent research has produced frameworks for integrating safety risk data into project schedules, visual models and other Construction planning tools. Unfortunately, only a few studies have attempted to quantify base‐level safety risk for Construction tasks and no study has attempted to quantify the degree to which spatial and temporal interactions among tasks contribute to the potential for injury. A research study was performed to quantify the impact that pair‐wise spatial and temporal interactions have on the base‐level risk of 25 common Highway Construction work tasks in the United States. Six hundred risk interactions were quantified by obtaining and aggregating over 23 500 individual ratings from certified experts using the Delphi method. The results indicate that incompatible tasks may increase the base‐level risk up to 60%. The most incompatible Highway Construction tasks are: (1) installing curbs and gutters and installing rigid pavement; and (2) Construction zone traffic control and installing ri...
-
Safety risk interactions among Highway Construction work tasks
Construction Management and Economics, 2011Co-Authors: Matthew R Hallowell, Behzad Esmaeili, Paul ChinowskyAbstract:Recent research has produced frameworks for integrating safety risk data into project schedules, visual models and other Construction planning tools. Unfortunately, only a few studies have attempted to quantify base-level safety risk for Construction tasks and no study has attempted to quantify the degree to which spatial and temporal interactions among tasks contribute to the potential for injury. A research study was performed to quantify the impact that pair-wise spatial and temporal interactions have on the base-level risk of 25 common Highway Construction work tasks in the United States. Six hundred risk interactions were quantified by obtaining and aggregating over 23 500 individual ratings from certified experts using the Delphi method. The results indicate that incompatible tasks may increase the base-level risk up to 60%. The most incompatible Highway Construction tasks are: (1) installing curbs and gutters and installing rigid pavement; and (2) Construction zone traffic control and installing rigid pavement. Additionally, watering and dust palliatives and pavement marking is the one compatible task pair and there are 45 neutral task pairs. The resulting database and analysis have the potential to increase the efficacy of existing frameworks for integration of safety risk data with project planning tools.
Paul Chinowsky - One of the best experts on this subject based on the ideXlab platform.
-
safety risk interactions among Highway Construction work tasks
Construction Management and Economics, 2011Co-Authors: Matthew R Hallowell, Behzad Esmaeili, Paul ChinowskyAbstract:Recent research has produced frameworks for integrating safety risk data into project schedules, visual models and other Construction planning tools. Unfortunately, only a few studies have attempted to quantify base‐level safety risk for Construction tasks and no study has attempted to quantify the degree to which spatial and temporal interactions among tasks contribute to the potential for injury. A research study was performed to quantify the impact that pair‐wise spatial and temporal interactions have on the base‐level risk of 25 common Highway Construction work tasks in the United States. Six hundred risk interactions were quantified by obtaining and aggregating over 23 500 individual ratings from certified experts using the Delphi method. The results indicate that incompatible tasks may increase the base‐level risk up to 60%. The most incompatible Highway Construction tasks are: (1) installing curbs and gutters and installing rigid pavement; and (2) Construction zone traffic control and installing ri...
-
Safety risk interactions among Highway Construction work tasks
Construction Management and Economics, 2011Co-Authors: Matthew R Hallowell, Behzad Esmaeili, Paul ChinowskyAbstract:Recent research has produced frameworks for integrating safety risk data into project schedules, visual models and other Construction planning tools. Unfortunately, only a few studies have attempted to quantify base-level safety risk for Construction tasks and no study has attempted to quantify the degree to which spatial and temporal interactions among tasks contribute to the potential for injury. A research study was performed to quantify the impact that pair-wise spatial and temporal interactions have on the base-level risk of 25 common Highway Construction work tasks in the United States. Six hundred risk interactions were quantified by obtaining and aggregating over 23 500 individual ratings from certified experts using the Delphi method. The results indicate that incompatible tasks may increase the base-level risk up to 60%. The most incompatible Highway Construction tasks are: (1) installing curbs and gutters and installing rigid pavement; and (2) Construction zone traffic control and installing rigid pavement. Additionally, watering and dust palliatives and pavement marking is the one compatible task pair and there are 45 neutral task pairs. The resulting database and analysis have the potential to increase the efficacy of existing frameworks for integration of safety risk data with project planning tools.
Wesley C Zech - One of the best experts on this subject based on the ideXlab platform.
-
state of the practice for liquidated damages incentive disincentive and road user cost provisions on high value transportation projects
Journal of Legal Affairs and Dispute Resolution in Engineering and Construction, 2019Co-Authors: T M Rogers, Wesley C Zech, J O Shambley, Wesley N Donald, J A RuedabenavidesAbstract:AbstractConstruction, rehabilitation, and maintenance of roads, Highways, and bridges are necessary activities for social and economic growth in the United States. Highway Construction often requir...
-
field evaluation of silt fence tieback systems at a Highway Construction site
Practice Periodical on Structural Design and Construction, 2009Co-Authors: Wesley C Zech, J S Mcdonald, T P ClementAbstract:Every year, Construction activities expose millions of acres of soil to the elements of wind, rain, and snow. This greatly increases the potential for erosion; and therefore, the need for efficient erosion and sediment control practices is a high priority. In this research, the performance of a silt fence system with tiebacks (a.k.a., "j-hooks") was investigated to determine its effectiveness as a sediment control technology at Highway Construction sites over multiple rainfall events. The data presented provide a qualitative perspective showing sediment migration over time along with the occurrence or lack of failures among two silt fence systems tested. The results from this field test exhibit that silt fence tieback systems are more effective in containing eroded sediment from Construction sites and also reduce the risk of silt fence system failures than traditional linear silt fence systems.
-
intermediate scale experiments to evaluate silt fence designs to control sediment discharge from Highway Construction sites
Journal of Hydrologic Engineering, 2008Co-Authors: Wesley C Zech, T P Clement, J L HalversonAbstract:Soil erosion occurring at Highway Construction sites can contribute large amounts of sediment to the local stream network and degrades overall water quality. The environmental impacts of the sediment-laden stormwater runoff can be mitigated by employing appropriate best management practices BMPs. Silt fence is one of the most widely used BMPs at Highway Construction sites. Numerous field studies have shown that silt fence installations at Highway sites have a high degree of failure due to flow around the end of the fence, and due to concentrated erosion along the toe of the fence. To address these problems, erosion control manuals often recommend installing a tieback also known as "j-hook" at the down slope end of the fence. However, no one has systematically studied the sediment removal efficiency of tieback designs to develop a rational procedure for field installations. In this research, we quantified the effectiveness of silt fence systems installed with tiebacks by comparing its efficiency against systems installed without tiebacks. We completed this compari- son study using an intermediate-scale laboratory model that was designed to study the erosion processes occurring at Highway construc- tion sites. The model allowed us to observe various erosion and sediment transport processes in a controlled setting. The results show that silt fence installations utilizing tiebacks remove sediment primarily through the process of sedimentation, not by filtration. Installation of a tieback improves the ability of the silt fence system to act as a temporary detention basin and greatly enhances the system's ability to remove suspended particles by sedimentation. Our experimental data shows that a well designed silt fence with tiebacks can remove up to 90% of solids transported by the runoff water.
-
development of silt fence tieback design methodology for Highway Construction installations
Transportation Research Record, 2007Co-Authors: Wesley C Zech, Jarid L Halverson, Prabhakar T ClementAbstract:This research effort focuses on improving sediment control practices used at Highway Construction projects by employing properly designed and correctly installed silt fence applications. Previous research indicated that tying silt fence installations back into the contour and creating a J-shaped hook (or a tieback) is an effective way to improve the efficiency of silt fence installations. Silt fences with tiebacks form a temporary detention basin, which helps facilitate sediment removal by sedimentation. The purpose of this research was to develop a rational numerical method for designing such silt fence tiebacks at Highway Construction sites. The proposed method employs a hydrological model to estimate the volume of runoff water generated by the watershed and balances the water with the storage capacity of the silt fence installed with a tieback. First, the Soil Conservation Service's method is used to estimate the amount of storm water generated during a design storm event. Then, with the cross-sectiona...
Behzad Esmaeili - One of the best experts on this subject based on the ideXlab platform.
-
integration of safety risk data with Highway Construction schedules
Construction Management and Economics, 2013Co-Authors: Behzad Esmaeili, Matthew R HallowellAbstract:The Construction industry is characterized by a relatively high injury and illness rate compared to other industries. Within the Construction industry, the Highway Construction and maintenance sector is one of the most dangerous. To improve safety in this sector, proactive methods of safety improvement and reliable risk data are needed. The safety risk quantification is the first step towards integrating safety data into design and planning. To enhance the current preConstruction safety practices, safety risks of Highway Construction and maintenance tasks were quantified and a decision support system was developed and tested that integrates safety risk data into the project schedules. Relative safety risks were quantified for 25 common Highway Construction tasks using the Delphi method. To ensure valid and reliable results, experts were selected according to rigorous requirements and multiple controls were employed to decrease cognitive biases. The data were incorporated into a decision support system cal...
-
safety risk interactions among Highway Construction work tasks
Construction Management and Economics, 2011Co-Authors: Matthew R Hallowell, Behzad Esmaeili, Paul ChinowskyAbstract:Recent research has produced frameworks for integrating safety risk data into project schedules, visual models and other Construction planning tools. Unfortunately, only a few studies have attempted to quantify base‐level safety risk for Construction tasks and no study has attempted to quantify the degree to which spatial and temporal interactions among tasks contribute to the potential for injury. A research study was performed to quantify the impact that pair‐wise spatial and temporal interactions have on the base‐level risk of 25 common Highway Construction work tasks in the United States. Six hundred risk interactions were quantified by obtaining and aggregating over 23 500 individual ratings from certified experts using the Delphi method. The results indicate that incompatible tasks may increase the base‐level risk up to 60%. The most incompatible Highway Construction tasks are: (1) installing curbs and gutters and installing rigid pavement; and (2) Construction zone traffic control and installing ri...
-
Safety risk interactions among Highway Construction work tasks
Construction Management and Economics, 2011Co-Authors: Matthew R Hallowell, Behzad Esmaeili, Paul ChinowskyAbstract:Recent research has produced frameworks for integrating safety risk data into project schedules, visual models and other Construction planning tools. Unfortunately, only a few studies have attempted to quantify base-level safety risk for Construction tasks and no study has attempted to quantify the degree to which spatial and temporal interactions among tasks contribute to the potential for injury. A research study was performed to quantify the impact that pair-wise spatial and temporal interactions have on the base-level risk of 25 common Highway Construction work tasks in the United States. Six hundred risk interactions were quantified by obtaining and aggregating over 23 500 individual ratings from certified experts using the Delphi method. The results indicate that incompatible tasks may increase the base-level risk up to 60%. The most incompatible Highway Construction tasks are: (1) installing curbs and gutters and installing rigid pavement; and (2) Construction zone traffic control and installing rigid pavement. Additionally, watering and dust palliatives and pavement marking is the one compatible task pair and there are 45 neutral task pairs. The resulting database and analysis have the potential to increase the efficacy of existing frameworks for integration of safety risk data with project planning tools.
Opeyemi E. Oluwatuyi - One of the best experts on this subject based on the ideXlab platform.
-
Ameliorating effect of milled eggshell on cement stabilized lateritic soil for Highway Construction
Case Studies in Construction Materials, 2018Co-Authors: Opeyemi E. Oluwatuyi, Bamidele O. Adeola, Elijah Aina Alhassan, Emeka Segun Nnochiri, A. E. Modupe, Olugbenga O. Elemile, Temidayo Obayanju, Grace AkereleAbstract:Abstract This case study outlined the outcomes from the laboratory assessment of a lateritic soil stabilized with milled eggshell, cement and mixture of both in ratio 1:1 for potential use as a Highway Construction material. The stabilizing binders were added to the soil at varying percentages of 0, 2, 4, 6, and 8% by weight of the soil and afterwards subjected to various laboratory tests to determine its ameliorating effect. The test results showed that both unsoaked and soaked California bearing ratio (CBR) values increased with higher stabilizing binder content. The unconfined compressive strength (UCS) values just like the CBR values also increased with higher stabilizing binder content. The 8% milled eggshell and cement stabilized samples recorded peak UCS value of 760.7 kN/m2, unsoaked CBR value of 87% and soaked CBR value of 45%. This peak UCS value met the condition by Nigerian General Specifications for Highways of 750–1500 kN/m2 for use as subbase material for light trafficked Highways. The microstructural analysis gave a possible explanation for an increase in the strength and decrease in Atterberg limit of stabilized samples. The durability of some stabilized soil samples was satisfactory, the percentage resistance to loss in strength was not below the recommended maximum of 80%. An 8% by soil weight of milled eggshell and cement mixture in ratio 1:1 stabilized lateritic soil could be used as a potential subbase material for Highway Construction.
-
Ameliorating effect of milled eggshell on cement stabilized lateritic soil for Highway Construction
Elsevier, 2018Co-Authors: Opeyemi E. Oluwatuyi, Bamidele O. Adeola, Elijah Aina Alhassan, Emeka Segun Nnochiri, A. E. Modupe, Olugbenga O. Elemile, Temidayo Obayanju, Grace AkereleAbstract:This case study outlined the outcomes from the laboratory assessment of a lateritic soil stabilized with milled eggshell, cement and mixture of both in ratio 1:1 for potential use as a Highway Construction material. The stabilizing binders were added to the soil at varying percentages of 0, 2, 4, 6, and 8% by weight of the soil and afterwards subjected to various laboratory tests to determine its ameliorating effect. The test results showed that both unsoaked and soaked California bearing ratio (CBR) values increased with higher stabilizing binder content. The unconfined compressive strength (UCS) values just like the CBR values also increased with higher stabilizing binder content. The 8% milled eggshell and cement stabilized samples recorded peak UCS value of 760.7 kN/m2, unsoaked CBR value of 87% and soaked CBR value of 45%. This peak UCS value met the condition by Nigerian General Specifications for Highways of 750–1500 kN/m2 for use as subbase material for light trafficked Highways. The microstructural analysis gave a possible explanation for an increase in the strength and decrease in Atterberg limit of stabilized samples. The durability of some stabilized soil samples was satisfactory, the percentage resistance to loss in strength was not below the recommended maximum of 80%. An 8% by soil weight of milled eggshell and cement mixture in ratio 1:1 stabilized lateritic soil could be used as a potential subbase material for Highway Construction. Keywords: California bearing ratio, Lateritic soil, Durability, Milled eggshell, Stabilizatio
-
geotechnical and environmental evaluation of lime cement stabilized soil mine tailing mixtures for Highway Construction
Transportation geotechnics, 2017Co-Authors: Oluwapelumi O Ojuri, A A Adavi, Opeyemi E. OluwatuyiAbstract:Abstract Lime–cement was used as a stabilizing binder in a ratio of 1:2 to treat Lateritic Soil-Mine Tailings (LMT) mixtures. Strength characteristics and environmental impact of the Lateritic Soil-Mine Tailings Binder Mix in Highway Construction was evaluated using a series of laboratory tests. Results of the geotechnical tests showed that the properties of the soil sample improved with the addition of mine tailings and binder. There was an increase in the maximum dry density with a decrease in the optimum moisture content. There was also an increase in the strength of the lateritic soil, this was evident from the California Bearing Ratio and the Unconfined Compressive Strength values. The environmental performance evaluation was determined by the leaching test, conducted on the LMT sample to determine the capability of the binder in retaining heavy metals. The results of the leaching test show that the binder was able to reduce the heavy metals in the leachate below the regulatory level, with the exception of barium and chromium. Mineralogical analysis done on the leached samples revealed that the binder was able to immobilise the mine tailing minerals that could adversely affect the environment in the soil matrix.
