Open Access. Powered by Scholars. Published by Universities.®

Civil and Environmental Engineering Commons™

Open Access. Powered by Scholars. Published by Universities.®

2015

Discipline
Institution
Keyword
Publication
Publication Type
File Type

Articles 301 - 330 of 1146

Full-Text Articles in Civil and Environmental Engineering

Developing Pavement Performance Prediction Models For The State Of Arkansas, Lena Baker Abu-Ennab Aug 2015

Developing Pavement Performance Prediction Models For The State Of Arkansas, Lena Baker Abu-Ennab

Theses and Dissertations

Pavement management systems (PMS) provide a methodology for synthesizing all the activities related to the pavement network. These include all the activities involved in the planning and programming, design, construction, maintenance, and rehabilitation (1). The effective implementation and utilization of PMS requires a systematic approach involving condition assessment and performance modelling. A very important part of such approach is the use of pavement performance prediction models to predict the future condition of pavements based on present condition. This study presents a methodology used to develop network level pavement performance prediction models for the pavement network in the state of Arkansas. …

Go to article

A Study On Navigation Safety On Putou Branch Channel Extension Project For Meizhou Bay, Kui Zhao Aug 2015

A Study On Navigation Safety On Putou Branch Channel Extension Project For Meizhou Bay, Kui Zhao

Maritime Safety & Environment Management Dissertations (Dalian)

No abstract provided.

Go to article

Risk Assessment On Carriage Of Maritime Dangerous Goods In Packaged Form By Ship, Sifang Zeng Aug 2015

Risk Assessment On Carriage Of Maritime Dangerous Goods In Packaged Form By Ship, Sifang Zeng

Maritime Safety & Environment Management Dissertations (Dalian)

No abstract provided.

Go to article

Optimization Of Containership Speed Based On Operation And Environment Regulations, Changjiang Yu Aug 2015

Optimization Of Containership Speed Based On Operation And Environment Regulations, Changjiang Yu

Maritime Safety & Environment Management Dissertations (Dalian)

No abstract provided.

Go to article

Vertical Icf Wall System, Purdue Ect Team Aug 2015

Vertical Icf Wall System, Purdue Ect Team

ECT Fact Sheets Archive

Traditional ICF systems’ installation is tedious and labor intensive resulting in out of level, bowing, and snaking walls with a significant amount of bracing adding to the cost. ICF (Insulated Concrete Form) walls are a form of structural walls used for construction. Hobbs Vertical ICF system uses less concrete, more recycled material and requires less labor for construction. The furring assemblies and retainer clips of the Hobbs VICF system are made from 100% recycled post-industrial waste.

Go to article

Prefabricated Building, Purdue Ect Team Aug 2015

Prefabricated Building, Purdue Ect Team

ECT Fact Sheets Archive

With the continuous demand for construction of new buildings, an easier, more sustainable, energy-efficient and environmentally friendly building method is necessary to save time, energy and cost. Hence, there has been an increasing need for a system such as BROAD sustainable building (BSB). A form of prefabricated building by BROAD Sustainable Building Co., LTD (BSB). It consists of flooring and ceiling, embedded shafts of ventilation, water supply & drainage, electricity and lighting. Other items include pillars, diagonal bracings, doors, windows, walls and sanitary wares, air conditioning, air quality products, lifts, building thermal insulations.

Go to article

Post-Tensioned Concrete Shear Wall, Purdue Ect Team Aug 2015

Post-Tensioned Concrete Shear Wall, Purdue Ect Team

ECT Fact Sheets Archive

The post-tension concrete shear wall by Tipping Mar will replace the conventional concrete shear wall in earthquake prone areas in many instances, depending on the height and scale of the building.

Go to article

Rapid Drying Concrete, Purdue Ect Team Aug 2015

Rapid Drying Concrete, Purdue Ect Team

ECT Fact Sheets Archive

One of the essential problems that are faced during construction is the drying of concrete and the presence of moisture which affects floor coverings that need to be placed. The rapid-drying characteristic in Aridusâ concrete allows for the quick reduction of moisture vapor that travels through the concrete pores of the concrete.

Go to article

Ap Alternatives Modular Solar Racking, Purdue Ect Team Aug 2015

Ap Alternatives Modular Solar Racking, Purdue Ect Team

ECT Fact Sheets Archive

Solar panels have been used to generate and supply electricity in various applications such as residential and commercial buildings. Therefore, a need for a quicker approach to installation as well as the need to reduce workmanship to speed up the process is needed. Solar racks are developed through the use of automated equipment to “preassemble the racking hardware, pre-install the solar modules, and drive helical anchors into the ground rapidly”. So instead of installing one panel at a time, AP Alternatives has created a new method that uses machines to make the process easier. This new automation of the installation …

Go to article

3d Printing For Bricks, Purdue Ect Team Aug 2015

3d Printing For Bricks, Purdue Ect Team

ECT Fact Sheets Archive

Building Bytes, by Brian Peters, is a project that uses desktop 3D printers to print bricks for architecture. Instead of using an expensive custom-made printer, it uses a normal standard 3D printer which is available for everyone and makes it more accessible and also easier for fabrication.

Go to article

Unraveling The Formation Of Continental Crust : A Review And Outlook, Eason Hong, Wei-Ting Kao Aug 2015

Unraveling The Formation Of Continental Crust : A Review And Outlook, Eason Hong, Wei-Ting Kao

Journal of Marine Science and Technology–Taiwan

The early Earth is generally believed to be a hot planet with a primitive basaltic oceanic crust. However, the question of how a batholiths-bearing continent was formed is still unresolved. Although many hypothetical interpretations seem appealing, the origin and volume dilemma of the batholiths is still under debate. According to recent literature, the Hadean Ocean is characterized by heat, acidity and reduction, significantly unlike its counterparts in Earth's history. We have found that this crucial marine setting, favoring the chemical weathering of basaltic rocks, is the key element for forming and stabilizing the primitive continents through convergent tectonics and the …

Go to article

Practitioner Interview, Walter Grayman Aug 2015

Practitioner Interview, Walter Grayman

All ECSTATIC Materials

Phone interview with Walter Grayman from Walter Grayman Cons. by Meghna Babbar-Sebens and Marcio Giacomoni. Interview questions asked inquired about (i) practitioner’s professional background, (ii) practitioner’s personal experience with systems analysis techniques and software in their job, (iii) role, benefits, and challenges in using systems analysis concepts in the water resources engineering profession, and (iv) recommendations for improving education of environmental and water resources systems analysis in universities.

Go to article

Performance Characteristics Of Posts Embedded In Soil, Brandt M. Humphrey, Karla A. Lechtenberg, John D. Reid, Ronald K. Faller, James C. Holloway Aug 2015

Performance Characteristics Of Posts Embedded In Soil, Brandt M. Humphrey, Karla A. Lechtenberg, John D. Reid, Ronald K. Faller, James C. Holloway

Nebraska Department of Transportation: Research Reports

The primary objective of this research study was to determine the post-soil impact reaction of W6x8.5 (W150x12.6) steel posts and 6-in. x 8-in. (152-mm x 203-mm) Southern Yellow Pine (SYP) posts, specifically along the weak axis. Five bogie tests were conducted on W6x8.5 (W150x12.6) A992 steel posts with a length of 72 in. with embedment depths ranging between of 24 and 40 in. (610 and 1,016 mm). Four bogies tests were conducted on 6-in. x 8-in. (152 mm x 203 mm) SYP posts embedded at depths ranging between 30 and 40 in. (735 and 1,016 mm). The target impact conditions …

Go to article

A Comparative Technological Review Of Hybrid Csp-Biomass Chp Systems In Europe, C. M. Iftekhar Hussain, Aidan Duffy, Brian Norton Aug 2015

A Comparative Technological Review Of Hybrid Csp-Biomass Chp Systems In Europe, C. M. Iftekhar Hussain, Aidan Duffy, Brian Norton

Conference Papers

This paper aims to explore different solar technologies and its suitability for hybridization with biomass for combined heat and power (CHP) generation in Europe. Although hybrid solar-biomass research and demonstration is in its infancy, it has the potential to provide dispatchable renewable energy at a significant scale over many areas in Europe. Therefore, this review examines the technical and economic reported performances on hybrid systems in order to assess the technical and economic viabilities of newly-emerging projects. Three different combinations of solar and biomass technologies are discussed in this paper: solar tower (ST) - biomass, parabolic trough (PT) - biomass …

Go to article

Geotechnical Field Reconnaissance: Gorkha (Nepal) Earthquake Of April 25, 2015 And Related Shaking Sequence, Youssef M.A. Hashash, Binod Tiwari, Robb E.S. Moss, Domniki Asimaki, Kevin B. Clahan, D. Scott Kieffer, Doug S. Dreger, Amy Macdonald, Chris M. Madugo, H. Benjamin Mason, Menzer Pehlivan, Deepak Rayamajhi, Indra Acharya, Basanta Adhikari Aug 2015

Geotechnical Field Reconnaissance: Gorkha (Nepal) Earthquake Of April 25, 2015 And Related Shaking Sequence, Youssef M.A. Hashash, Binod Tiwari, Robb E.S. Moss, Domniki Asimaki, Kevin B. Clahan, D. Scott Kieffer, Doug S. Dreger, Amy Macdonald, Chris M. Madugo, H. Benjamin Mason, Menzer Pehlivan, Deepak Rayamajhi, Indra Acharya, Basanta Adhikari

Civil and Environmental Engineering

The April 25, 2015 Gorkha (Nepal) Earthquake and its related aftershocks had a devastating impact on Nepal. The earthquake sequence resulted in nearly 9,000 deaths, tens of thousands of injuries, and has left hundreds of thousands of inhabitants homeless. With economic losses estimated at several billion US dollars, the financial impact to Nepal is severe and the rebuilding phase will likely span many years. The Geotechnical Extreme Events Reconnaissance (GEER) Association assembled a reconnaissance team under the leadership of D. Scott Kieffer, Binod Tiwari and Youssef M.A. Hashash to evaluate geotechnical impacts of the April 25, 2015 Gorkha Earthquake and …

Go to article

Phase Transforming Cellular Materials (Pxcms) Design And Assembly, Nadia N. Aljabi, Pablo Zavattieri, David Restrepo Aug 2015

Phase Transforming Cellular Materials (Pxcms) Design And Assembly, Nadia N. Aljabi, Pablo Zavattieri, David Restrepo

The Summer Undergraduate Research Fellowship (SURF) Symposium

We introduce a new class of phase transforming cellular materials (PXCMs) based on locally bistable or metastable unit cells that form periodic microstructures, where the thermomechanical behavior of each unit cell exhibits snap-through type behavior. We propose to explore the capabilities of these new materials to improve structural resistance to damage caused by natural hazards including PXCM in structural members. The main benefits of this material are that it can absorb energy and is reusable. During the first part of this work, a fabrication method for PXCMs based on the assembly material slotted stripes was explored. The 1D unit cell …

Go to article

Role Of Soil Parameters On Loading Of Buried Structures, Xiao Zhang, Mark D. Bowman, Rafael R. Armendariz Briones Aug 2015

Role Of Soil Parameters On Loading Of Buried Structures, Xiao Zhang, Mark D. Bowman, Rafael R. Armendariz Briones

The Summer Undergraduate Research Fellowship (SURF) Symposium

Load rating is the process to evaluate and explore the structural capacity of bridges as much as possible within safety range. As a balance between economy and safety, proper load ratings save money and keep public safe. Knowing the contribution and interaction of each different soil parameter on the loading can significantly reduce the amount of work when load rating those structures. However, for buried structures without plans, such contribution or interaction is never known. This parametric study explores how much each soil parameter of three types of soils can affect the loading of buried structures without plans. An existing …

Go to article

Straining Definitions, William Pollalis, Santiago Pujol Aug 2015

Straining Definitions, William Pollalis, Santiago Pujol

The Summer Undergraduate Research Fellowship (SURF) Symposium

The concept of strain is ubiquitous in engineering textbooks. It is defined early in engineering education as change in length divided by initial length, and is used to quantify deformations due to things like stresses and temperature changes. The concept itself is quite straightforward and represents homogenous materials well, but homogenous materials are rarely present in engineering design. Composite materials such reinforced concrete cannot be simply defined, as their properties are heavily influenced by their non-uniformity. For example, there are large deformations around tensile cracks in reinforced concrete, where the reinforcement withstands all the tensile stress, and little deformation in …

Go to article

Seismic Vulnerability Assessment Of Low-Rise Reinforced Concrete Buildings In Kathmandu, Nepal, Prateek Pratap Shah, Santiago Pujol Aug 2015

Seismic Vulnerability Assessment Of Low-Rise Reinforced Concrete Buildings In Kathmandu, Nepal, Prateek Pratap Shah, Santiago Pujol

The Summer Undergraduate Research Fellowship (SURF) Symposium

In seismically active cities like Kathmandu, there often exists a need to assess the seismic vulnerability of a large number of poorly designed buildings within a short period of time. Traditional analysis techniques do not work because they require building data that are either inaccurate or unavailable. One alternative to traditional analysis techniques is to use simple correlations like the Priority Index. This index uses basic building information such as floor area, column area, and wall area to estimate the seismic vulnerability of a building. Following the 2015 Nepal earthquake, 146 low-rise reinforced concrete buildings were surveyed in Kathmandu, Nepal. …

Go to article

Recovery Of Nutrients From Animal And Human Wastes, Nathaniel E. Kallmyer, Zhe Sun, Kaitlin Harris, Zhi Zhou, Ernest R. Blatchley Iii Aug 2015

Recovery Of Nutrients From Animal And Human Wastes, Nathaniel E. Kallmyer, Zhe Sun, Kaitlin Harris, Zhi Zhou, Ernest R. Blatchley Iii

The Summer Undergraduate Research Fellowship (SURF) Symposium

Removal of nitrogen- and phosphorus-containing molecules from wastewater is necessary to prevent excessive growth of algae and resulting chemical changes to bodies of water. Of wastewater components, urine contains relatively high concentrations of nitrogen and phosphorus, the majority of which is ultimately present as ammonia and phosphate. Separation and stabilization of these nutrients may also allow for their reuse as fertilizer. Before the nutrients may be stored, they must be stabilized. At least a portion of ammonia-N must be converted to nonvolatile nitrogen. This may be achieved by using ammonia- and nitrite-oxidizing bacteria (AOB and NOB, respectively) to convert ammonia …

Go to article

Influence Of Warping On Stress For Restrained Concrete Slabs: For Application To Crcp, Corey M. Beck, W. Jason Weiss, Nathan T. Todd Aug 2015

Influence Of Warping On Stress For Restrained Concrete Slabs: For Application To Crcp, Corey M. Beck, W. Jason Weiss, Nathan T. Todd

The Summer Undergraduate Research Fellowship (SURF) Symposium

Continuously-reinforced concrete pavement (CRCP) is widely used in transportation system because of its low maintenance requirement. However, the need for large volumes of steel creates a high cost for new construction. The Illinois Tollway is preparing to substantially renovate highways in and around Chicago and this work seeks to understand how concretes of varying mixture designs can be made thinner by reducing the amount of built-in stress. The experiment examines warping in beams subjected to various degrees of restraint, in an effort to assess effectiveness at reducing warping in continuously reinforced concrete pavements. Value added methodologies such as internal curing …

Go to article

Examining The Hydration And Mechanical Properties Of Cement Paste Containing Cellulose Nanocrystals, Yvette Valadez-Carranza, Charles Y. Chiu, W. Jason Weiss, Pablo Zavattieri, Jeffrey P. Youngblood Aug 2015

Examining The Hydration And Mechanical Properties Of Cement Paste Containing Cellulose Nanocrystals, Yvette Valadez-Carranza, Charles Y. Chiu, W. Jason Weiss, Pablo Zavattieri, Jeffrey P. Youngblood

The Summer Undergraduate Research Fellowship (SURF) Symposium

Cellulose nanocrystals (CNCs) are a nano-scaled particulae material that has been shown to improve strength in cementitious pastes. One advantage of CNCs compared to other nano-materials is that CNCs are renewable and sustainable. The objective of this investigation is to investigate the influence of additional alkali content on the behavior of CNCs in cement paste. This work evaluates flexural and compressive strength as a function of heat of hydration—which measures the extent of reaction. Previous mechanical tests on cement paste containing cellulose nanocrystals (CNCs) have shown CNCs to improve the flexural strength of cement paste by approximately 30%. Isothermal calorimetry …

Go to article

Membrane Pre-Treatment Using Chemical Disinfectants In Halide Impaired Waters, Holly M. Haflich, Kun Huang, Amisha D. Shah, John Howarter, Logan Kearney Aug 2015

Membrane Pre-Treatment Using Chemical Disinfectants In Halide Impaired Waters, Holly M. Haflich, Kun Huang, Amisha D. Shah, John Howarter, Logan Kearney

The Summer Undergraduate Research Fellowship (SURF) Symposium

The use of membrane filtration processes for desalination, water reuse, and water reclamation techniques are becoming more prevalent given freshwater shortages. However, the treatment of these waters is challenging because of the membranes used in these processes. During nanofiltration and reverse osmosis the membranes undergo biofouling. Reverse osmosis and nanofiltration are high-pressure membrane filtration techniques that treat seawater, brackish waters, and industrial wastewaters. Because of the biofouling, the polyamide thin film needs to be pretreated with chlorine (HOCl/ OCl-) as a disinfectant, but this damages the polyamide membrane. When the free chlorine is in the presence of halide-impaired waters, it …

Go to article

Approach To Increasing Indiana Rural Road Safety On Intersections, Ammanuiel A. Kebede, John E. Haddock Aug 2015

Approach To Increasing Indiana Rural Road Safety On Intersections, Ammanuiel A. Kebede, John E. Haddock

The Summer Undergraduate Research Fellowship (SURF) Symposium

In 2009, there were more than 17,000 reported fatal crashes in rural areas of United States which accounted 56 percent of total fatal crashes. This number has not declined in a significant amount since 2009. Studies are undergoing on these rural area roadways, including intersections, to identify the major causes and take the necessary countermeasure. By using previous intersection related fatal and injury crash data, it is possible to identify high-risk intersections to point out and make the appropriate improvement. Five year fatal and injury crash data was collected (2008-2012) for three Indiana rural counties that had the highest frequency …

Go to article

Chemical Modification Of Uniform Soils And Soils With High/Low Plasticity Index, Xuanchi Li, Fei Tao, Antonio Bobet Aug 2015

Chemical Modification Of Uniform Soils And Soils With High/Low Plasticity Index, Xuanchi Li, Fei Tao, Antonio Bobet

The Summer Undergraduate Research Fellowship (SURF) Symposium

Lime and/or cement are used to treat weak subgrade soils during construction of highways. These chemicals are mixed with the soil to improve its workability, compactability and engineering properties. INDOT (Indiana Department of Transportation) has been using chemical modification of native soils for the past 20 years. In fact, 90% of current subgrade is treated, typically with quick lime, lime byproducts or cement. For pavement design, it is customary to not include any improvement of the subgrade for the design of the pavement layers. Recent research completed through JTRP (Joint Transportation Research Program) recommends a higher stiffness modulus for chemically …

Go to article

Work In Progress -- Does A Technology-Rich Transportation Engineering Experiences Increase Interest In Civil Engineering, Marissa K. Orr, Sanjay Tewari, David E. Hall, Norman D. Pumphrey Aug 2015

Work In Progress -- Does A Technology-Rich Transportation Engineering Experiences Increase Interest In Civil Engineering, Marissa K. Orr, Sanjay Tewari, David E. Hall, Norman D. Pumphrey

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

This paper examines whether a technology-rich transportation engineering experience generates interest among college freshman students towards transportation related degrees and careers, specifically, whether it increases interest in civil engineering. Louisiana Tech’s first-year engineering experience provides relevant, project-focused education for over 500 students each year and an opportunity to introduce transportation-related projects. The six semester-hour, three-course sequence, called “Living with the Lab,” boosts experiential learning through student ownership of inexpensive laboratory equipment. In one section of the Living with the Lab course, a transportation engineer visited the class and the students were led through a technology-rich transportation engineering activity. They used …

Go to article

Application Of Fiscal Incentives For Development Of East Natuna Gas Field For Long-Term National Natural Gas Demand, Marwan Batubara, Widodo Wahyu Purwanto, Akhmad Fauzi Aug 2015

Application Of Fiscal Incentives For Development Of East Natuna Gas Field For Long-Term National Natural Gas Demand, Marwan Batubara, Widodo Wahyu Purwanto, Akhmad Fauzi

Makara Journal of Technology

East Natuna gas field, which has proven reserves of 46 trillion cubic feet, is projected to meet long-term natural gas needs. However, CO2-content of the gas reserves reaches 71%, leading to expensive development costs. This research investigates the feasibility of the field based on several fiscal incentives. Firstly, gas supply-demand until year 2040 was analyzed. Then, based on the analysis, the field was developed using high CO2 gas separation technology to produce gas of 1300 MMSCFD in 2023, 2600 MMSCFD in 2031, and 3900 MMSCFD in 2039. Finally, the economic feasibility was assessed using cash flow analysis in accordance with …

Go to article

Transmission Electron Microscopy Characterization Of High-Temperatur Oxidation Of Fe-20cr-5al Alloy Prepared By Focused Ion Beam Technique, Mohammad Dani, Pudji Untoro, Teguh Yulius Surya Panca Putra, Parikin Parikin, Joachim Mayer, Arbi Dimyati Aug 2015

Transmission Electron Microscopy Characterization Of High-Temperatur Oxidation Of Fe-20cr-5al Alloy Prepared By Focused Ion Beam Technique, Mohammad Dani, Pudji Untoro, Teguh Yulius Surya Panca Putra, Parikin Parikin, Joachim Mayer, Arbi Dimyati

Makara Journal of Technology

The Focused Ion Beam (FIB) technique was applied for cross section preparation of the oxidized alloy for Transmission Electron Microscopy (TEM) study. Prior to preparation, the specimens of Fe-20Cr-5Al alloy sheet were oxidized in air at 1200 oC for 2 minutes, 10 minutes, 2 hours, and 100 hours. The microstructure and elemental composition of the samples were characterized using TEM equipped with an Energy Dispersive X-Ray Spectroscopy (EDX). The Electron Energy Loss Spectroscopy (EELS) was used to determine of the light elements. The TEM investigation reveals remarkable microstructure evolution of the specimens during oxidation which generally exhibit a typical multi-layer …

Go to article

High Temperature Corrosion Of Aluminized Aisi 4130 Steel With The Different Composition Of Nacl/Na2so4 Deposits, Mohammad Badaruddin, Chaur Jeng Wang, Yudhistyra Saputra, Abu Khalid Rivai Aug 2015

High Temperature Corrosion Of Aluminized Aisi 4130 Steel With The Different Composition Of Nacl/Na2so4 Deposits, Mohammad Badaruddin, Chaur Jeng Wang, Yudhistyra Saputra, Abu Khalid Rivai

Makara Journal of Technology

The high temperature corrosion of AISI 4130 steel can be increased by hot-dip aluminizing coating. The aluminized steel specimens with the deposit composition of 100/0, 30/70, 50/50, 70/30, and 0/100 (wt.%) NaCl/Na2SO4 were oxidized at 750 °C for 1-49 h periods. According to a parabolic rate constant (kp) value, the aluminized steel with deposit composition of 70/30 NaCl/Na2SO4 shows the highest kp value (3.71 × 10-11 g2cm- 4s-1), later followed by the kp value of 3.35 × 10-11 g2cm-4s-1 for 100/0 and the lowest kp value is 7.731 × 10-12 g2cm-4s-1 for 0/100. Whereas, the kp value for the aluminized …

Go to article

Effects Of Supplier-Manufacturer Relationships On Supply-Chain Performance Of Manufacturing Industries In Indonesia, Rachmad Hidayat, Khisbullah Hudha, Sabarudin Akhmad Aug 2015

Effects Of Supplier-Manufacturer Relationships On Supply-Chain Performance Of Manufacturing Industries In Indonesia, Rachmad Hidayat, Khisbullah Hudha, Sabarudin Akhmad

Makara Journal of Technology

The present study describes the relationships between commitment, communication, satisfaction, trust, relationship quality with suppliers, and supply-chain performance. The population of the study was manufacturing companies in Indonesia. Respondents were the chief executive officers or corporate secretaries or the designated managers involved in strategic decision making. Samples were taken by using a proportional area random sampling technique. Structural Equation Modeling (SEM) was used for analysis. Results of both direct and indirect testing of hypothesis indicated two hypotheses of positive and significant effects and nine hypotheses of positive but insignificant effects. Those hypotheses of positive and significant effects were the direct …

Go to article

First Prev Next Last