Posted by: mahyarov - 11-10-2012, 08:02 AM - Forum: Concrete
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Durability Assessment of Recycled Concrete Aggregates for use in New Concrete
Author: Ideker, Jason H Adams, Matthew P Tanner, Jennifer | Size: 1.99 MB | Format:PDF | Quality:Original preprint | Publisher: Oregon State University, Corvallis | Year: 2012 | pages: 72
The primary goal of this research project was to investigate the long-term durability of concrete incorporating recycled concrete aggregate (RCA) through accelerated laboratory testing. Overall it was found that modifications to standard aggregate testing and characterization standards were necessary for testing RCA. This included modifications to standard tests including ASTM C 128, C 305 and C 1260. It was found that the potential for alkali silica reactivity did exist for new concrete containing RCA. The characteristics of the RCA also had a profound effect on alkali silica reaction (ASR) related expansion. RCA with a higher content of reactive coarse or fine aggregate (compared to paste fraction) exhibited greater reaction and would therefore require higher levels of mitigation. Based on testing in this research project precision and bias statements in ASTM C 1260 (for virgin aggregate) do not apply to RCA. Recommendations for future work are also included in this report.
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Posted by: mahyarov - 11-10-2012, 07:58 AM - Forum: Concrete
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Materials Selection for Concrete Overlays
Author: Kim, Dong H Fowler, David W Ferron, Raissa P Trevino, Manuel M Whitney, David P | Size: 14.46 MB | Format:PDF | Quality:Original preprint | Publisher: University of Texas, Austin | Year: 2012 | pages: 210
Concrete overlays have been a rehabilitation method for many years. It has been extensively utilized and studied in other states, but Texas is still at an initial stage of fully implementing the method. The large volume of concrete highways in Texas makes bonded concrete overlays, unbonded concrete overlays, and whitetoppings very viable options. However, there is a lack of educational guidelines for pavement engineers for concrete overlay construction. This research presents the information gathered from literature review, condition survey, and evaluation of existing concrete overlays in Texas. Also, a laboratory research was performed for recommendations for materials selection and construction for concrete overlays. From these, guidelines for materials selection and construction method developed that will assist in future concrete overlays in Texas are presented.
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The Federal Highway Administration's (FHWA) "Every Day Counts" initiative aims to shorten the overall project delivery time, enhance safety, and protect the environment both on and around construction projects. Using innovative planning, design, and construction methods, Accelerated Bridge Construction (ABC) techniques reduce on-site construction time for new or replacement bridges. One aspect of ABC is Prefabricated Bridge Elements and Systems (PBES), where bridge components are fabricated off site to reduce on-site construction activities. Many state departments of transportation (DOTs) are currently making efforts to implement PBES for construction of their off-system bridges. The purpose of this research project was to investigate other states' standards and to evaluate them for possible implementation in Florida. An exhaustive search was made, and new literature was reviewed, to learn about current DOT standards and practices. The search revealed that the states with the most prefabricated bridge standards or activities are as follows: Utah, Alabama, Texas, Minnesota, and a collaboration of Northeastern states. These standards were reviewed for details such as the presence of post-tensioning, joint types, design load, and inspectability. The two standard bridge types that show the most promise for adoption by Florida Department of Transportation (FDOT) are Minnesota's Inverted-tee Beam, and PCI's "Northeastern Extreme Tee" (NEXT) Beam. A summary of the findings, including advantages and disadvantages of the bridge systems, is included in this report. Also included is a comprehensive list of Web links to standard drawings from all state DOTs, as well as more information on ABC and PBES, which could also be helpful to expedite other research that involves standards and bridge construction/design practices.
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Measurement of Temperature and Soil Properties for Finite Element Model Verification
Author: Darrow, Margaret M | Size: 25.92 MB | Format:PDF | Quality:Original preprint | Publisher: Alaska University Transportation Center | Year: 2012 | pages: 295
In recent years, Alaska Department of Transportation and Public Facilities personnel have used TEMP/W, a commercially available two-dimensional finite element program, to conduct thermal modeling of various embankment configurations in an effort to reduce the thawing of ice-rich permafrost through thermally stable embankment designs. This modeling was done with historic air temperature data and input parameters derived from the literature, since site-specific data is typically not available. The overall goal of this study was to verify the thermal modeling results produced by TEMP/W. Temperatures and soil properties were measured at two different sites underlain by permafrost in Interior and Southcentral Alaska. A sensitivity analysis of certain input parameters was conducted on models of each site. Analysis indicates that the most critical input parameter is air temperature. While historic air temperature data provided an approximation of the regional climate, this data produced model results that were too cold by several degrees. Using air temperatures measured at each site resulted in models that closely matched the measured soil temperatures, and either matched or overestimated active layer depths. Using the overestimated active layer depth for design purposes would result in a more conservative embankment construction, which is a favorable approach if a warming climate is considered.
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This book contains chapters detailing significant advances and applications in fluid dynamics modeling with focus on biomedical, bioengineering, chemical, civil and environmental engineering, aeronautics, astronautics, and automotive. We hope this book can be a useful resource to scientists and engineers who are interested in fundamentals and applications of fluid dynamics.
Contents
Preface
1 Surface Friction and Boundary Layer Thickening in Transitional Flow
2 Bubble Rise Phenomena in Non-Newtonian Crystal Suspensions
3 Physical Modeling of Gas Pollutant Motion in the Atmosphere
4 Numerical Investigation for Steady and Unsteady Cavitating Flows
5 Incorporation of Computational Fluid Dynamics into a Fluid Mechanics Curriculum
6 Numerical Simulation on Mechanical Ventilation- Two Case Studies with Different Operation Modes
7 The New Use of Diffusion Theories for the Design of Heat Setting Process in Fabric Drying
8 Identification from Flight Data of the Aerodynamics of an Experimental Re-Entry Vehicle
9 Computer Modelling of Automobile Fires
10 Blast Wave Simulations with a Runge-Kutta Discontinuous Galerkin Method
11 pMDI Sprays: Theory, Experiment and Numerical Simulation
12 A New Correlation for Prediction of Viscosities of Omani Fahud-Field Crude Oils
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Procurement of Airport Development and Planning Contracts
Author: Alfert Jr, Robert Ryan, Karen M Block, Roy | Size: 453 KB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2012 | pages: 46 | ISBN: 9780309258524
Most airport operators, as public agencies, are subject to some type of procurement law or regulation for carrying out procurements and awarding contracts. Airports procure a variety of contracts for construction services, professional services, and the purchase of equipment. Typically, some form of competitive selection is required. The various competitive procurement requirements exist to promote fair and open competition and to ensure integrity and confidence in the public procurement system. Which procurement requirements apply to any given procurement will depend upon the type of goods and services required and the funding source. This digest provides guidance to airport operators, their counsel, and bidders on how to determine which requirements apply to any given procurement and an overview of the consequences for noncompliance so that airports can better understand the inherent risks associated with each funding source.
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Posted by: mahyarov - 11-10-2012, 07:22 AM - Forum: Concrete
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Glass Fiber Reinforced Polymer Dowel Bar Evaluation
Author: Anderson, Keith W Uhlmeyer, Jeff S Russell, Mark Kinne, Chuck Washington State Department of Transportation Weston, Jim Davari, Moe Kromm, Kevin | Size: 2.56 MB | Format:PDF | Quality:Unspecified | Publisher: Washington State Department of Transportation | Year: 2012 | pages: 36
Glass Fiber Reinforced Polymer (GFRP) dowel bars were installed on one new construction project and two dowel bar retrofit projects to evaluate the performance of this type of dowel bar in comparison to steel dowel bars installed on the same contracts. The primary data collection site (I-82, Yakima River Br. Vic. to Granger) included 67 joints retrofit with GFRP dowels and an equal number of epoxy coated doweled joints that serve as the control section. Falling weight deflectometer (FWD) testing will be used to evaluate the load transfer efficiency (LTE) of the two types of dowel bars. Periodic coring of the concrete at the joints is also planned to examine the condition of the GFRP and epoxy coated dowels. Post-installation FWD testing of the primary data site revealed that the average LTE of the joints retrofit with epoxy coated dowel was higher than the joints retrofit with the GFRP dowels and that the difference was statistically significant. Preinstallation FWD testing showed no difference in the LTE of the joints in the areas where the GFRP and epoxy coated dowels were installed.
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OriginLab Corporation, a leading publisher of data analysis and graphing software, announced the release of OriginPro version 9. The new version provides a set of features and enhancements that were developed based on customer feedback and industry demand.
Origin and OriginPro are used by more than 150,000 customers worldwide, spanning Fortune 500 companies, research institutions, and colleges and universities across various disciplines including physics, chemistry, biology, pharmacology, engineering, and manufacturing.
The most significant feature in Origin 9 is enhanced 3D graphing using OpenGL, the industry standard for high-performance graphics. This significantly boosts performance for plotting and editing 3D graphs created from large datasets. Users can now rotate, pan, and zoom within 3D graphs to examine details much more efficiently than in previous versions. Improvements in 3D graphing also include 3D parametric function plots, the ability to plot multiple stacked surfaces in a single graph layer, and enhanced support for error bars and labels.
Another key feature in Origin 9 is the ability to reduce data in worksheets by applying filters to one or more columns. This enables users to quickly reduce large datasets and have all associated graphs and analysis results automatically update when filter conditions are modified. Additional new functionality includes video creation from graphs, an improved vertical cursor gadget that operates across multiple graphs, and the ability to place graphs as floating objects on worksheets for easy report creation. OriginPro contains all of the Origin 9 features, as well as new tools for implicit function fitting and IIR filter design.
Significant enhancements available in Origin 9 span all major areas of the software. New features and improvements include:
- High-performance 3D graphing using OpenGL
- 3D parametric function plots
- Movie creation
- Data filter
- Floating graphs in worksheets
- Global vertical cursor
- Implicit function fitting (OriginPro)
- IIR filter design (OriginPro)
- 3D surface plots from XYZ data
- 3D bar plots with Z error and 3D scatter plots with XYZ errors
- Improved scatter matrix plot
- Improved data info dialog
- Context menu to easily swap data from graphs
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Author: Noel J. Everard, John L. Tanner, Everard Noel | Size: 64 MB | Format:PDF | Quality:Scanner | Publisher: Mcgraw-hill | Year: 1966 | pages: 329 | ISBN: 0070197717
Editorial Reviews
From the Back Cover
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Inside you will find:
150 fully-worked problems
114 more practice problems
Coverage of all course fundamentals--supplements any class text
Clear explanations that help you understand the complete course: concepts, definitions, and more
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If you want top grades and thorough understanding of reinforced concrete design, this powerful study tool is the best tutor you can have!
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file converted to OCR PDF.
please , if anyone have access to 2004 edition , kindly provide to dear members.
regards
smith
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