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Benefits Of Using Geotextile Between Subgrade Soil And Base Course Aggregate In Low Volume Roads In Virginia
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Book Synopsis Benefits of Using Geotextile Between Subgrade Soil and Base Course Aggregate in Low-volume Roads in Virginia by : M. Shabbir Hossain
Download or read book Benefits of Using Geotextile Between Subgrade Soil and Base Course Aggregate in Low-volume Roads in Virginia written by M. Shabbir Hossain and published by . This book was released on 2009 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geosynthetics have increasingly been used since the 1960s in pavement structures to provide reinforcement; to serve as a permeable separator to prevent mixing of subgrade with subbase or base course materials; and to provide drainage. A reliable method of quantifying these benefits is needed to justify the more widespread use of these materials. The purpose of this study was to quantify the benefit of using a geotextile as a separator in low-volume roadways such as secondary and subdivision streets. A field trial was conducted on a section of Virginia Route 743 near the Charlottesville-Albemarle Airport in Albemarle County to achieve this objective. A geotextile was placed between the aggregate base and subgrade in one lane of the section to prevent failure attributable to intermixing, and the adjacent lane was left unmodified as a control. In addition to the field trial, a small-scale accelerated loading laboratory test was conducted to quantify the benefit of using geotextile as a separator for a range of pavement design variables, including variations in soil strength, traffic volume, and aggregate properties. A statistical analysis of data gathered by a falling weight deflectometer during construction and after 8 months of traffic showed the lane with geotextile to have a slightly higher structural capacity. As severe intermixing and base failure in the control section were not expected during the 8-month period because of the low volume of traffic and a dry season, the benefit may have been attributable to a reinforcing effect. Although the size of the apparatus and the boundary condition may have prevented the most accurate quantification of the benefit, the laboratory testing further demonstrated the benefit. Most laboratory samples with geotextile had less deformation than the control sample. Intermixing of soil and aggregate was not observed when very densely graded base aggregate was used. When a more open-graded aggregate was used, the geotextile reduced the amount of fines migration into the aggregate layer; however, the fouled aggregate did not appear to have lost significant structural stiffness. Therefore, the separator benefit of geotextile in the laboratory testing was also apparently attributable to a reinforcing effect. The use of geotextile materials appears to have great potential to extend the service life of pavements on the secondary road system, offering significant cost savings to VDOT. It is recommended that this section of road be periodically evaluated to quantify this potential increased service and that more test sections on subdivision streets with a weaker subgrade condition or full-scale accelerated testing be conducted for a reliable quantification of the benefit.
Book Synopsis Engineering Criteria for Use of Geotextile Fabrics in Pavement and Railroad Construction by : Richard H. Grau
Download or read book Engineering Criteria for Use of Geotextile Fabrics in Pavement and Railroad Construction written by Richard H. Grau and published by . This book was released on 1984 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: Available literature concerning the use of geotextiles as separator mechanisms between angular granular and subgrade materials used in the construction of roadways and railroads is presented. Procedures and results of tests using a model load cart with a rolling wheel load to evaluate geotextiles are also presented. The model load cart provides a fast and excellent means of applying a large number of traffic cycles to an aggregate geotextile subgrade system in a short period of time. Criteria for selecting geotextiles to be used in road and railroad construction by the U.S. Army Corps of Engineers are analyzed. A separator mechanism is generally provided between layers in the pavement system for low-volume trafficked short lifetime roadways of any geotextile, but a nonwoven, needle-punched, polyester fabric is required for long-term, high-volume usage. The fabric can weigh a minimum of 4 oz/sq yd and can transmit water laterally. Geotextiles used in railroad construction can be placed 10-12 in. below the bottom of railroad ties to minimize abrasive damage caused by full depth tamping.
Download or read book Gravel Roads written by Ken Skorseth and published by . This book was released on 2000 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this manual is to provide clear and helpful information for maintaining gravel roads. Very little technical help is available to small agencies that are responsible for managing these roads. Gravel road maintenance has traditionally been "more of an art than a science" and very few formal standards exist. This manual contains guidelines to help answer the questions that arise concerning gravel road maintenance such as: What is enough surface crown? What is too much? What causes corrugation? The information is as nontechnical as possible without sacrificing clear guidelines and instructions on how to do the job right.
Book Synopsis Designing with Geosynthetics by : Robert M. Koerner
Download or read book Designing with Geosynthetics written by Robert M. Koerner and published by . This book was released on 1990 with total page 680 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geosynthetic materials have entered the mainstream in the professional arena and are no longer considered new construction material. Professionals need to keep up with the nuances of how geosynthetics work. Emphasizes design by function; overviews all types of geosynthetics, with stand-alone units on particular materials. Uses S.I. units for all problems and examples. Expands coverage of containers and tubes in the geotextile chapter. Discusses walls and slope design, including seismic analysis, in the geogrid chapter. Treats wet landfills, agricultural waste, waste stability, and dam waterproofing in the geomembrane chapter. Discusses new products and related performances in the geosynthetic clay liner chapter. Discusses new products and related behavior, including fiber reinforcement and wall drainage, in the geocomposite chapter. Adds a completely new chapter on geofoam. A useful reference for transportation, geotechnical, environmental, and hydraulics professionals and engineers.
Book Synopsis Geotextile Reinforcement of Low-bearing-capacity Soils by : Karen S. Henry
Download or read book Geotextile Reinforcement of Low-bearing-capacity Soils written by Karen S. Henry and published by . This book was released on 1999 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Low-Volume Roads Engineering - Best Management Practices Field Guide by : Gordon Keller
Download or read book Low-Volume Roads Engineering - Best Management Practices Field Guide written by Gordon Keller and published by . This book was released on 2023-11-30 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Low-Volume Roads Engineering Best Management Practices Field Guide is intended to provide an overview of the key planning, location, design, construction, and maintenance aspects of roads that can cause adverse environmental impacts and to list key ways to prevent those impacts. Best Management Practices are general techniques or design practices that, when applied and adapted to fit site-specific conditions, will prevent or reduce pollution and maintain water quality. BMPs for roads have been developed by many agencies since roads often have a major adverse impact on water quality, and most of those impacts are preventable with good engineering and management practices. Roads that are not well planned or located, not properly designed or constructed, not well maintained, or not made with durable materials often have negative effects on water quality and the environment.
Book Synopsis The Use of Geosynthetics to Reinforce Low Volume Roads by : Hans Erickson
Download or read book The Use of Geosynthetics to Reinforce Low Volume Roads written by Hans Erickson and published by . This book was released on 2001 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Guidelines for Use of Fabrics in Construction and Maintenance of Low-volume Roads by : John E. Steward
Download or read book Guidelines for Use of Fabrics in Construction and Maintenance of Low-volume Roads written by John E. Steward and published by . This book was released on 1978 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: Porous woven and non-woven fabrics have been used in road construction in Region since 1974. The fabrics have been used: 1) as filters for subsurface drainage; 2) separation layers to prevent subgrade soil contamination of base layers; 3) subgrade restraining layers for weak subgrades; 4) earth reinforcement to build retaining walls; S) erosion control, and 6) water proofing membranes. A reference notebook titled "Fabrics In Construction" is due for release to Region 6 Forests in June 1977. This notebook contains a description of current practices and the state-of-the-art in the use of fabrics in road construction and maintenance. The notebook defines terminology and lists the key factors involved in each usage, and relates the fabric physical and chemical properties to the intended usage. The notebook also contains appropriate technical literature, manufacturers' literature and cost data on the known available fabrics. This report highlights the contents of the reference book and discusses the current knowledge for the use of fabrics in low-volume road construction and maintenance. Present and projected uses of the fabric and the most significant physical properties related to these uses are discussed. Probable future uses and the areas of greatest need for technical knowledge and experience are outlined. The process for moving a fabric or fabric use from the conception and trial use state into full use with standard specifications and design criteria is described.
Book Synopsis Quantifying the Benefit of Geosynthetics for Use in Virginia's Low Volume Roads by : Benjamin Neale Schmidt
Download or read book Quantifying the Benefit of Geosynthetics for Use in Virginia's Low Volume Roads written by Benjamin Neale Schmidt and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book GMA White Paper Ii written by Ryan Berg and published by . This book was released on 2000 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geosynthetic reinforcement of the base, or subbase, course of pavement structures is addressed. The value added with reinforcement, design criteria/protocols, and practices for design and for material specifications are presented. Base, or subbase, reinforcement is defined within as the use of geosynthetic reinforcement in flexible pavements to support vehicular traffic over the life of a pavement structure. Primary base reinforcement benefits are to improve the service life and/or obtain equivalent performance with a reduced structural section. Substantial life-cycle cost savings are possible with base reinforcement. The use of geosynthetic reinforcement to aid in construction over low strength subgrades, termed subgrade restraint within, is also addressed. Geosynthetic reinforcement is used to increase the support equipment during construction of a roadway. Geogrid, geotextile, and geogrid-geotextile composite materials are addressed within.
Book Synopsis Use of Geosynthetics for Separation and Stabilization in Low-Volume Roadways by : Edward J. Hoppe
Download or read book Use of Geosynthetics for Separation and Stabilization in Low-Volume Roadways written by Edward J. Hoppe and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The implementation of geosynthetics in road construction in the United States dates back to the 1970s. Although the benefits of these materials are widely recognized, actual design and construction practices are not universal. Guidelines for use are often developed locally based on specific field experience. Currently, the Virginia Department of Transportation (VDOT) provides specifications (but no design guidance) for only one function of subgrade geotextile: stabilization. Pavement layer separation is not explicitly addressed by VDOT. This study reviewed corresponding practices at other transportation agencies, focusing on subgrade and pavement applications. In addition, observations gathered from field testing of two known sites with geosynthetics in Virginia were analyzed. Finally, life cycle cost analyses (LCCAs) were performed on two common secondary road designs, each with the options of separator geotextile and preventive maintenance, to estimate comparative costs under three different rates of subbase contamination by fines migrating from the subgrade. The LCCA employed actual VDOT cost data and conceptual pavement layer deterioration curves that are based on AASHTO curves augmented by differentiated subbase deterioration resulting from three hypothetical contamination rates. Unlike the current LCCA used by VDOTs Materials Division, the LCCA model developed in this study explicitly recognizes the fact of potential subbase layer deterioration because of contamination by subgrade fines, comporting with the widely recognized function of geotextile separator. The results indicate that separator geotextile imparts long-run cost-effectiveness relative to pavements without geotextile separators at contamination rates of 0.1 in per year and greater. At contamination rates of 0.05 in per year and lower, the addition of separator geotextile is not cost-effective, although the results vary slightly depending on the treatment of estimated pavement design life remaining at the end of the analysis period. The study recommends that VDOT revise its current specifications to include subgrade separation and subgrade stabilization geosynthetics as separate and distinct pay items, and it provides suggested specification language to effect this change. Guidelines to implement these changes are also enumerated.
Book Synopsis Effectiveness of Geosynthetics in Stabilizing Soft Subgrades by :
Download or read book Effectiveness of Geosynthetics in Stabilizing Soft Subgrades written by and published by . This book was released on 2005 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Geotextiles and Geomembranes in Civil Engineering by : G.P.T.M. van Santvoort
Download or read book Geotextiles and Geomembranes in Civil Engineering written by G.P.T.M. van Santvoort and published by CRC Press. This book was released on 1994-01-01 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geotextiles and geomembranes, made from synthetic polymers such as woven or non-woven fabrics, membranes, sheets and composites, have a variety of uses: in erosion control systems, embankments, pollution control systems, water storage, drainage and road construction. Taking all these applications into consideration, numerous laboratory and prototype tests were performed, the results of which have been published in this handbook, which includes sections on: · geotextile and geomembrane history · function analysis · production technology · project realization · soil reinforcement Designed for civil engineers, this text covers a broad range of areas and provides a useful handbook for those working with geotextiles and geomembranes.
Book Synopsis Geotechnical Aspects of Pavements 2000 by :
Download or read book Geotechnical Aspects of Pavements 2000 written by and published by . This book was released on 2000 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :American Association of State Highway and Transportation Officials Publisher :AASHTO ISBN 13 :1560510552 Total Pages :622 pages Book Rating :4.5/5 (65 download)
Book Synopsis AASHTO Guide for Design of Pavement Structures, 1993 by : American Association of State Highway and Transportation Officials
Download or read book AASHTO Guide for Design of Pavement Structures, 1993 written by American Association of State Highway and Transportation Officials and published by AASHTO. This book was released on 1993 with total page 622 pages. Available in PDF, EPUB and Kindle. Book excerpt: Design related project level pavement management - Economic evaluation of alternative pavement design strategies - Reliability / - Pavement design procedures for new construction or reconstruction : Design requirements - Highway pavement structural design - Low-volume road design / - Pavement design procedures for rehabilitation of existing pavements : Rehabilitation concepts - Guides for field data collection - Rehabilitation methods other than overlay - Rehabilitation methods with overlays / - Mechanistic-empirical design procedures.
Book Synopsis An Introduction to Geotextiles in Pavement and Drainage Applications, 2nd Edition by : J. Paul Guyer, P.E., R.A.
Download or read book An Introduction to Geotextiles in Pavement and Drainage Applications, 2nd Edition written by J. Paul Guyer, P.E., R.A. and published by Guyer Partners. This book was released on 2020-06-30 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introductory technical guidance for civil engineers and construction managers interested in geotextiles for pavement and drainage applications. Here is what is discussed: 1. GEOTEXTILES IN GENERAL 2. PAVEMENT APPLICATIONS 3. DRAINAGE APPLICATIONS.
Book Synopsis Highway Subdrainage Design by : Lyle K. Moulton
Download or read book Highway Subdrainage Design written by Lyle K. Moulton and published by . This book was released on 1980 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
