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Articles 1531 - 1560 of 7869
Full-Text Articles in Civil and Environmental Engineering
Modot Pavement Preservation Research Program, David Newton Richardson, Neil Lennart Anderson, John Bowders, Andrew Z. Boeckmann, Ronaldo Luna, S. Michael Lusher, Brent Rosenblad, Lesley Sneed
Modot Pavement Preservation Research Program, David Newton Richardson, Neil Lennart Anderson, John Bowders, Andrew Z. Boeckmann, Ronaldo Luna, S. Michael Lusher, Brent Rosenblad, Lesley Sneed
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
The following report documents a research project on pavement preservation performed by the Missouri University of Science and Technology (Missouri S&T) and the University of Missouri-Columbia (UMC) on behalf of the Missouri Department of Transportation (MoDOT). the report consists of a Summary Report followed by six detailed technical reports. to achieve the goal of reducing maintenance costs and improving minor road ratings, MoDOT has embarked upon a plan of formalizing its maintenance/preservation planning. to assist in developing the plan, MoDOT contracted with the Missouri S&T and UMC to conduct a research project, entitled "MoDOT Pavement Preservation Research Program". the product …
The Quest For An Unambiguous Parameterization Of Mixing Efficiency In Stably Stratified Geophysical Flows, Benjamin D. Mater, Subhas K. Venayagamoorthy
The Quest For An Unambiguous Parameterization Of Mixing Efficiency In Stably Stratified Geophysical Flows, Benjamin D. Mater, Subhas K. Venayagamoorthy
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Estimates of turbulent mixing in geophysical settings typically depend on the efficiency at which shear-driven turbulence mixes density across isopycnals. To date, however, no unifying parameterization of diapycnal mixing efficiency exists due to the variability of natural flows and also due to certain ambiguities that arise from descriptions based on a single parameter. Here we highlight important ambiguities of some common single-parameter schemes in the context of a multiparameter framework that considers the independent effects of shear, buoyancy, and viscosity. Parameterizations based on the gradient Richardson number (Ri), the turbulent Froude number (FrT), and the buoyancy Reynolds number (Reb) are …
Effect Of Weak Magnetic Field On Arsenate And Arsenite Removal From Water By Zerovalent Iron: An Xafs Investigation, Yuankui Sun, Xiaohong Guan, Jianmin Wang, Xiaoguang Meng, Chunhua Xu, Gongming Zhou
Effect Of Weak Magnetic Field On Arsenate And Arsenite Removal From Water By Zerovalent Iron: An Xafs Investigation, Yuankui Sun, Xiaohong Guan, Jianmin Wang, Xiaoguang Meng, Chunhua Xu, Gongming Zhou
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
In this study, a weak magnetic field (WMF), superimposed with a permanent magnet, was utilized to improve ZVI corrosion and thereby enhance As(V)/As(III) removal by ZVI at pHini 3.0-9.0. The experiment with real arsenic-bearing groundwater revealed that WMF could greatly improve arsenic removal by ZVI even in the presence of various cations and anions. The WMF-induced improvement in As(V)/As(III) removal by ZVI should be primarily associated with accelerated ZVI corrosion, as evidenced by the pH variation, Fe2+ release, and the formation of corrosion products as characterized with X-ray absorption fine structure spectroscopy. The arsenic species analysis in solution/solid phases at …
Ccfss Special Edition Technical Bulletin Summer 2014, Wei-Wen Yu Center For Cold-Formed Steel Structures
Ccfss Special Edition Technical Bulletin Summer 2014, Wei-Wen Yu Center For Cold-Formed Steel Structures
CCFSS Technical Bulletins (1993 - 2020)
No abstract provided.
Cold-Formed Steel Design - Vol. 2, American Iron And Steel Institute (Aisi)
Cold-Formed Steel Design - Vol. 2, American Iron And Steel Institute (Aisi)
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
No abstract provided.
Splice Performance Evaluation Of Enamel-Coated Rebar For Structural Safety, Genda Chen, Chenglin Wu
Splice Performance Evaluation Of Enamel-Coated Rebar For Structural Safety, Genda Chen, Chenglin Wu
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
This report summarizes the findings and results from an experimental study of vitreous enamel coating effects on the bond strength between deformed rebar and normal strength concrete. A total of 24 beam splice specimens were tested under four-point loading with four parameters investigated: bar size, lap splice length, coating, and confinement conditions. As the splice length increases, the ratio of bond strength between coated rebar and black rebar first increases from 1.0 to a maximum value of 1.44, and then decreases to 1.0. The maximum bond strength ratio corresponds to the near initial yielding of coated rebar. On the average, …
Development Of Bridge Girder Movement Criteria For Accelerated Bridge Construction, Genda Chen, Yi Bao
Development Of Bridge Girder Movement Criteria For Accelerated Bridge Construction, Genda Chen, Yi Bao
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
End diaphragms connect multiple girders to form a bridge superstructure system for effective resistance to earthquake loads. Concrete girder bridges that include end diaphragms consistently proved to perform well during previous earthquake events. However, whether concrete bridges without end diaphragms are definitively inadequate in seismic performance is yet to be answered. The 2010 Chile Earthquake indicated that properly designed bridge girders and their lateral movement stoppers (shear keys) may perform equally well with those with end diaphragms. In this report, a feasibility study on the design of girder bridges without end diaphragms is presented. This study is particularly significant in …
Unbonded Portland Cement Concrete Overlay/Pavement Monitoring With Integrated Grating And Scattering Optical Fiber Sensors, Genda Chen, Ying Huang, Yi Bao
Unbonded Portland Cement Concrete Overlay/Pavement Monitoring With Integrated Grating And Scattering Optical Fiber Sensors, Genda Chen, Ying Huang, Yi Bao
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
This report summarizes the findings and results from a laboratory and field study on the strain distribution and crack development in 3" thick concrete panels cast on top of existing concrete pavements as a rapid rehabilitation strategy for roadways. Both fiber Bragg gratings (FBG) and Brillouin Optical Time Domain Reflectometry/Analysis (BOTDR/A) were applied and tested for their feasibility and effectiveness in distributed strain measurement and crack detection. For laboratory tests, six 6'×6" panels were cast similar to their corresponding field construction. Each was tested under both truck loads and under threepoint loads. The performance of distributed BOTDR/A strain measurements was …
Nondestructive Evaluation Of Mechanically Stabilized Earth Walls With Frequency-Modulated Continuous Wave (Fm-Cw) Radar, Mohammad Tayeb Ahmad Ghasr, Yi Bao, Kuang Ying, K. M. Combs, R. Zoughi, Genda Chen
Nondestructive Evaluation Of Mechanically Stabilized Earth Walls With Frequency-Modulated Continuous Wave (Fm-Cw) Radar, Mohammad Tayeb Ahmad Ghasr, Yi Bao, Kuang Ying, K. M. Combs, R. Zoughi, Genda Chen
Electrical and Computer Engineering Faculty Research & Creative Works
Effective techniques for a nondestructive evaluation of mechanically stabilized earth (MSE) walls during normal operation or immediately after an earthquake event are yet to be developed. MSE walls often have a rough surface finishing for the purpose of decoration and are reinforced with both horizontal and vertical steel bars. Two wide-band microwave inspection approaches were investigated for detecting and evaluating characteristics of materials behind an MSE wall section. The first approach used spot measurements with a wide-band frequency-modulated continuous wave (FM-CW) radar system. While effective to penetrate through mortar blocks in the laboratory, the radar system was found to have …
Stub-Column Test Method For Effective Area Of Cold-Formed Steel Columns, 2013 Edition, American Iron And Steel Institute
Stub-Column Test Method For Effective Area Of Cold-Formed Steel Columns, 2013 Edition, American Iron And Steel Institute
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
No abstract provided.
Rotational-Lateral Stiffness Test Method For Beam-To-Panel Assemblies, 2013 Edition, American Iron And Steel Institute
Rotational-Lateral Stiffness Test Method For Beam-To-Panel Assemblies, 2013 Edition, American Iron And Steel Institute
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
No abstract provided.
Standard Test Methods For Determining The Tensile And Shear Strengths Of Screws, 2013 Edition, American Iron And Steel Institute
Standard Test Methods For Determining The Tensile And Shear Strengths Of Screws, 2013 Edition, American Iron And Steel Institute
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
No abstract provided.
North American Standard For The Design Of Profiled Steel Diaphragm Panels, 2013 Edition, American Iron And Steel Institute
North American Standard For The Design Of Profiled Steel Diaphragm Panels, 2013 Edition, American Iron And Steel Institute
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
No abstract provided.
Standard Procedures For Panel And Anchor Structural Tests, 2013 Edition, American Iron And Steel Institute
Standard Procedures For Panel And Anchor Structural Tests, 2013 Edition, American Iron And Steel Institute
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
No abstract provided.
Test Standard For Cold-Formed Steel Connections, 2013 Edition, American Iron And Steel Institute
Test Standard For Cold-Formed Steel Connections, 2013 Edition, American Iron And Steel Institute
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
No abstract provided.
Test Method For Distortional Buckling Of Cold-Formed Steel Hat-Shaped Compression Members, 2013 Edition, American Iron And Steel Institute
Test Method For Distortional Buckling Of Cold-Formed Steel Hat-Shaped Compression Members, 2013 Edition, American Iron And Steel Institute
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
No abstract provided.
Test Standard For Cantilever Test Method For Cold-Formed Steel Diaphragms, 2013 Edition, American Iron And Steel Institute
Test Standard For Cantilever Test Method For Cold-Formed Steel Diaphragms, 2013 Edition, American Iron And Steel Institute
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
No abstract provided.
Method For Flexural Testing Of Cold-Formed Steel Hat-Shaped Beams, 2013 Edition, American Iron And Steel Institute
Method For Flexural Testing Of Cold-Formed Steel Hat-Shaped Beams, 2013 Edition, American Iron And Steel Institute
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
No abstract provided.
Test Standard For Hold-Downs Attached To Cold-Formed Steel Structural Framing, 2013 Edition, American Iron And Steel Institute
Test Standard For Hold-Downs Attached To Cold-Formed Steel Structural Framing, 2013 Edition, American Iron And Steel Institute
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
No abstract provided.
Test Standard For Joist Connectors Attached To Cold-Formed Steel Structural Framing, 2013 Edition, American Iron And Steel Institute
Test Standard For Joist Connectors Attached To Cold-Formed Steel Structural Framing, 2013 Edition, American Iron And Steel Institute
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
No abstract provided.
Standard Test Method For Determining The Web Crippling Strength Of Cold-Formed Steel Beams, 2013 Edition, American Iron And Steel Institute
Standard Test Method For Determining The Web Crippling Strength Of Cold-Formed Steel Beams, 2013 Edition, American Iron And Steel Institute
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
No abstract provided.
Test Procedure For Determining A Strength Value For A Roof Panel-To-Purlin-To-Anchorage Device Connection, 2013 Edition, American Iron And Steel Institute
Test Procedure For Determining A Strength Value For A Roof Panel-To-Purlin-To-Anchorage Device Connection, 2013 Edition, American Iron And Steel Institute
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
No abstract provided.
Base Test Method For Purlins Supporting A Standing Seam Roof System, 2013 Edition, American Iron And Steel Institute
Base Test Method For Purlins Supporting A Standing Seam Roof System, 2013 Edition, American Iron And Steel Institute
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
No abstract provided.
Standard Method For Determination Of Uniform And Local Ductility, 2013 Edition, American Iron And Steel Institute
Standard Method For Determination Of Uniform And Local Ductility, 2013 Edition, American Iron And Steel Institute
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
No abstract provided.
Utilizing Mobile Health Technology At The Bottom Of The Pyramid, Sarah E. Oerther, Phalakshi Manjrekar, Daniel B. Oerther
Utilizing Mobile Health Technology At The Bottom Of The Pyramid, Sarah E. Oerther, Phalakshi Manjrekar, Daniel B. Oerther
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Among the Millennium Development Goals, MDG 5 Maternal Health has as its dual objectives: (a) reduce by three quarters the maternal mortality ratio; and (b) achieve universal access to reproductive health. Existing maternal health survey instruments were evaluated, modified, adapted, and used to assess perceptions and practices by mothers in villages located in the state of Gujarat in western India as well as women residing in urban Mumbai (formerly Bombay). Women who had recently given birth were asked a series of questions regarding maternal attitudes and behaviors before, during, and shortly after pregnancy including basic health data (i.e., height and …
Utilizing Structural Equation Modeling In The Development Of A Standardized Intervention Assessment Tool, L. E. Voth-Gaeddert, Daniel B. Oerther
Utilizing Structural Equation Modeling In The Development Of A Standardized Intervention Assessment Tool, L. E. Voth-Gaeddert, Daniel B. Oerther
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
There are numerous approaches to measuring multidimensional poverty; these include the Human Development Index and the Multidimensional Poverty Index among others [1]. However, a gap in the literature is found when intervention assessment tools are investigated. The idea of creating a standardized assessment tool would allow for a deeper understanding of poverty on a per community basis. Structural Equation Modeling (SEM) offers a robust platform in which to establish such a tool. An overview of SEM and several other general approaches to data aggregation are addressed. The notion of a standardized intervention assessment tool is discussed; this is focused on …
Chemical And Hydrodynamic Mechanisms For Long-Term Geological Carbon Storage, Susan J. Altman, Wen Deng, For Full List Of Authors, See Publisher's Website.
Chemical And Hydrodynamic Mechanisms For Long-Term Geological Carbon Storage, Susan J. Altman, Wen Deng, For Full List Of Authors, See Publisher's Website.
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Geological storage of CO₂ (GCS), also referred to as carbon sequestration, is a critical component for decreasing anthropogenic CO₂ atmospheric emissions. Stored CO₂ will exist as a supercritical phase, most likely in deep, saline, sedimentary reservoirs. Research at the Center for Frontiers of Subsurface Energy Security (CFSES), a Department of Energy, Energy Frontier Research Center, provides insights into the storage process. The integration of pore-scale experiments, molecular dynamics simulations, and study of natural analogue sites has enabled understanding of the efficacy of capillary, solubility, and dissolution trapping of CO₂ for GCS. Molecular dynamics simulations provide insight on relative wetting of …
Effects Of Tendon Spacing On In-Plane Behavior Of Posttensioned Masonry Walls, Dongun Ryu, Anil C. Wijeyewickrema, Mohamed A. Elgawady, M. A.K.M. Madurapperuma
Effects Of Tendon Spacing On In-Plane Behavior Of Posttensioned Masonry Walls, Dongun Ryu, Anil C. Wijeyewickrema, Mohamed A. Elgawady, M. A.K.M. Madurapperuma
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
In-plane behavior of unbonded posttensioned clay brick masonry walls are investigated using detailed finite-element (FE) models. FE models of three walls having different aspect ratios of 1.50, 1.00, and 0.67 are developed. Effects of tendon spacing on in-plane behavior of these walls are investigated using different tendon spacings ranging from 0.61 m (2 ft) to 3.81 m (12.5 ft). In addition, the effects of having different horizontal reinforcement ratios of 0%, 0.1%, and 0.5% on the in-plane behavior of the walls were investigated. The stresses in the tendons are calculated using different approaches, and then the flexural strength of each …
A Unifying Framework For Parameterizing Stably Stratified Shear-Flow Turbulence, Benjamin D. Mater, Subhas Karan Venayagamoorthy
A Unifying Framework For Parameterizing Stably Stratified Shear-Flow Turbulence, Benjamin D. Mater, Subhas Karan Venayagamoorthy
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
An alternative framework for parameterizing stably stratified shear-flow turbulence is presented. Using dimensional analysis, four non-dimensional parameters of interest are identified that consider the independent effects of stratification, shear, viscosity, and scalar diffusivity. In the interest of geophysical applications, the problem is further simplified by considering only high Reynolds number flow. This leads to a two-dimensional parameter space based on a buoyancy strength parameter (i.e., an inverse Froude number) and a shear strength parameter. Consideration for the gradient Richardson number allows the space to be divided into an unforced regime, a shear dominated regime, and a buoyancy-dominated regime. On this …
A Comparative Study Of The Mechanical Properties, Fracture Behavior, Creep, And Shrinkage Of Chemically Based Self-Consolidating Concrete, Mahdi Arezoumandi, Mark Ezzell, Jeffery S. Volz
A Comparative Study Of The Mechanical Properties, Fracture Behavior, Creep, And Shrinkage Of Chemically Based Self-Consolidating Concrete, Mahdi Arezoumandi, Mark Ezzell, Jeffery S. Volz
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
This study presents the results of an experimental investigation that compares the mechanical properties, fracture behavior, creep, and shrinkage of a chemically based self-consolidating concrete (SCC) mix with that of a corresponding conventional concrete (CC) mix. The CC and SCC mix designs followed conventional proportioning in terms of aggregate type and content, cement content, air content, water-cementitious materials (w/cm) ratio, and workability. Then, using only chemical admixtures, the authors converted the CC mix to an SCC mix with all of the necessary passing, filling, flowability, and stability requirements typically found in SCC. The high fluidity was achieved with a polycarboxylate-based …