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Assessing Corrosion of MSE Wall Reinforcement by Travis M. Gerber,Daniel A. Billings Pdf
The primary objective of this study was to extract reinforcement coupons from select MSE walls and document the extent of corrosion. A secondary objective of this project was to develop and assess techniques for removal of coupons on two-stage MSE walls.
Assessing the Long-term Performance of Mechanically Stabilized Earth Walls by Travis M. Gerber Pdf
"Mechanically stabilized earth (MSE) walls are an important class of infrastructure assets whose long-term performance depends on various factors. As with most all other classes of assets, MSE walls need periodic inspection and assessment of performance. To date, some agencies have established MSE wall monitoring programs, whereas others are looking for guidance, tools, and funding to establish their own monitoring programs. The objective of this synthesis project is to determine how transportation agencies monitor, assess, and predict the long-term performance of MSE walls. The information used to develop this synthesis came from a literature review together with a survey and interviews. Of the 52 U.S. and 12 Canadian targeted survey recipients, 39 and five, respectively, responded. This synthesis reveals that unlike bridges and pavements, MSE walls and retaining walls in general are often overlooked as assets. Fewer than one-quarter of state-level transportation agencies in the United States have developed some type of MSE wall inventory beyond that which may be captured as part of their bridge inventories. Fewer still have the methods and means to populate their inventories with data from ongoing inspections from which assessments of wall performance can be made. In the United States, there is no widely used, consistently applied system for managing MSE walls. Wall inventory and monitoring practices vary between agencies. This synthesis examines existing practices concerning the nature, scope, and extent of existing MSE wall inventories. It also examines the collection of MSE wall data, including the types of performance data collected, how they are maintained in wall inventories and databases, the frequency of inventory activities, and assessment practices relevant to reinforcement corrosion and degradation. Later parts of this synthesis discuss how MSE wall performance data are assessed, interpreted, and used in asset management decisions. This synthesis finds that the most well-implemented wall inventory and assessment system in the United States is the Wall Inventory Program developed by FHWA for the National Park Service. However, this system, like some others, uses 'condition narratives' in a process that can be somewhat cumbersome and subjective. Other systems use more direct numeric scales to describe wall conditions, and an advantage of such systems is that they are often compatible with those used in assessments of bridges. As experience with MSE walls accumulates, agencies will likely continue to develop, refine, and better calibrate procedures affecting design, construction, condition assessment, and asset management decisions. One portion of this synthesis is dedicated to summarizing the actions taken thus far by survey respondents to improve the long-term performance of their MSE walls. Many agencies prescribe the use of a pre-approved wall design and/or wall supplier. Other actions or policies frequently focus on drainage-related issues."--Summary.
Evaluation of the SSL MSE Plus Retaining Wall System by Highway Innovative Technology Evaluation Center (U.S.) Pdf
Prepared by the Highway Innovative Technology Evaluation Center (HITEC), a CERF service center. This report describes a HITEC evaluation designed to determine the basic capabilities and limitations of the MSE Plus System, manufactured by SSL, LLC, for use as a mechanically stabilized earth retaining system. The evaluation was conducted based on material, design, construction, performance, and quality assurance information outlined in the HITEC Protocol. TheØMSE PlusØSystem features rectangular segmental precast concrete facing panels and galanized welded wire, grid-type soil reinforcement.
Evaluation of Corrosion of Metallic Reinforcements and Connections in MSE Retaining Walls by Christopher L. Raeburn Pdf
Mechanically Stabilized Earth (MSE) retaining walls have become the dominant retained wall system on ODOT projects. The permanent MSE walls constructed on ODOT projects, in recent years, use metallic reinforcements and facing connections buried directly in the backfill soil. Accelerated deterioration of these structural elements would have serious financial and safety impacts for the Department. Classical MSE wall design incorporates an estimate of deterioration of reinforcement by corrosion. Monitoring of actual corrosion performance, however, is an important element of managing the current inventory of MSE walls. Monitoring could answer key questions that can provide for the best management of the existing walls, and provide feedback to the design process for future installations. This report details a literature review of methods for estimating and measuring deterioration of structural reinforcing elements in both concrete and MSE walls. It also presents a selected history of metallic reinforcement design specification and utilization. A listing of the MSE walls that can be identified in the ODOT Bridge Data System is included.
Evaluation of the Retained Earth MSE Wall System by Foster Geotechnical, a Division of L.B. Foster Company by Highway Innovative Technology Evaluation Center (U.S.) Pdf
Steel-Reinforced Concrete Structures by Mohamed El-Reedy Pdf
A Practical Guide to Maintenance Carrying a billion-dollar price tag, corrosion of reinforced concrete is the enemy of every country's investment in real estate. The widespread and long-term use of reinforced concrete makes its correct and proper examination, maintenance, and repair paramount. Steel-Reinforced Concrete Structur
Evaluation of the Maccaferri Terramesh System Retaining Wall by Highway Innovative Technology Evaluation Center (U.S.) Pdf
Prepared by the Highway Innovative Technology Evaluation Center (HITEC), a CERF/IIEC Innovation Center. This report describes a HITEC evaluation designed to determine the basic capabilities and limitations of the Terramesh Retaining Wall System for use as a technically viable, mechanically stabilized earth, retaining wall system. The evaluation was conducted based on material, design, construction, performance, and quality assurance mainformation outlined in the HITEC Protocol. The Terramesh System, supplied by Maccaferri, Inc.,Øfeatures a Gabion basket facing of various configurations and metal double-twisted grid type of soil reinforcement, which is manufactured integrally with the basket facing blocks.
Advances in Geo-Science and Geo-Structures by Awdhesh Kumar Choudhary,Somenath Mondal,Subhadeep Metya,G. L. Sivakumar Babu Pdf
This book presents select proceedings of the National conference on Geo-Science and Geo-Structures (GSGS 2020). It provides sustainable solutions to various challenges encountered in the field of geotechnical engineering. The topics presented include advanced characterization to study the behavior of geomaterials, shallow and deep foundations including tunneling, use of geosynthetics and other soil reinforcing materials in minimizing slope failures and landslides, dynamics of soils and foundations, and its connection with energy geotechnics, transportation geotechnics, and offshore geotechnics. The book further highlights various aspects of ground improvement techniques by incorporating the use of industrial by-products, forensic analyses of geo-structures, instrumentation and sensing techniques in geotechnical engineering and issues associated with geo-environmental engineering. The book will be a valuable reference for budding researchers, academicians, practitioners and policymakers interested in sustainable practices associated with geotechnical engineering and related domains.
Evaluation of the ISOGRID Retaining Wall System by Highway Innovative Technology Evaluation Center (U.S.) Pdf
Prepared by the Highway Innovative Technology Evaluation Center, a CERF service center. This report presents the results of a HITEC evaluation of the Isogrid Retaining Wall System, designed and developed by the Neel Company. The report describes the basic capabilities and limitations of the Isogrid System for use as a technically viable precast, mechanically stabilized earth retaining wall system. The evaluation was conducted based on material, design, construction, performance, and quality assurance information outlined in the HITEC Protocol. The Isogrid System features a diamond-shaped, segmental precast concrete facing panel with weep holes where four panels intersect and welded wire, grid-type soil reinforcement attached to the center of each facing panel.
Steel-Reinforced Concrete Structures by Mohamed A Elreedy Pdf
This book examines the corrosion of reinforced concrete from a practical point of view, highlights protective design and repair procedures, and presents ongoing maintenance protocols. Updated throughout, this new edition adds additional information on concrete repair using Carbon Fiber Reinforced Polymers (CFRP), and reviews new examples of the effects of corrosion on both prestressed and reinforced concrete structures. It also examines economic analysis procedures and the probability of structural failures to define structural risk assessment, and covers precautions and recommendations for protecting reinforced concrete structures from corrosion based on the latest codes and specifications.
Asset Management Inventory and Data Collection by Anonim Pdf
An efficient and accurate inventory of a state highway agency's assets, along with the means to assess the condition of those assets and model their performance, is critical to enabling an agency to make informed investment decisions in a Transportation Asset Management (TAM) environment. Today, new technologies provide fast and improved ways to gather, process, and analyze data. The key is to identify and gather the most useful, reliable, cost-effect information and use it to make informed decisions for asset management. Four key infrastructure areas have been identified as primary asset components; pavements, bridges, geotechnical features, and roadside appurtenances. Each area contains multiple categories and data elements important for sound decision making. Although some similarities exist in these four primary categories, the nature of data collection may differ, depending on the asset type. The, sheer number of data elements and the length of asset networks for pavements and roadside appurtenances render the automated highway speed data collection method a necessity rather than a luxury. However, the discrete nature of bridges and geotechnical features make the automated mobile data collection method on a network level unfeasible with today's technology. Important issues in the collection process include precision, subjectivity and variability of the process itself, as well as speed, safety of the survey crew, proximity of the public, cost, etc. Although previous research has attempted to address these issues and determine the most appropriate method(s), the question remains as to which roadway data collection system is best for state highway agencies given real world constraints. This research set up a "sealed envelope" experiment wherein the identification, location, description, and quality of the asset data elements are known only to NCSU researchers. Vendors are informed of only the data necessary to perform their evaluation. To support this effort at 95-mile test course near Raleigh, North Carolina was identified, which contained a sampling of pavement, roadside, geotechnical and bridge elements. This document reports on the findings from the study
Evaluation of the Versa Lok/Miragrid Reinforced Soil Wall System by Highway Innovative Technology Evaluation Center (U.S.) Pdf
Prepared by the Highway Innovative Technology Evaluaton Center (HITEC), a service center ofØCivil Engineering Research Foundation. This evaluation was performed on the VERSA-LOK/Miragrid Reinforced Soil Wall System, a mechanically stabilized earth structure developed by VERSA-LOK Retaining Wall Systems, Inc., of Oakdale, Minnesota. The evaluation was conducted based on design, construction, performance, and quality assurance information provided by VERSA-LOK and their geogrid reinforcement supplier, TC Mirafi, Inc., and evaluated for conformance with the HITEC protocol.
Concrete Reinforcement Corrosion by Peter Pullar-Strecker Pdf
"Reinforcement corrision is the most important cause of deterioration in reinforced concrete structutres today. By comparing the different repair methods which have been established during recent years and discussing their advantages and drawbacks, this guide details practical approaches to enable non-specialist investigators to carry out at least some initial investigation themselves and considers the problems of detailsed investigations in a way which even the most experienced consultations and their clients will find helpful." - back cover.
