AASHTO R 50-2018 Standard Practice for Geosynthetic Reinforcement of the Aggregate Base Course of Flexible Pavement Structures.pdf
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1、Standard Practice for Geosynthetic Reinforcement of the Aggregate Base Course of Flexible Pavement Structures AASHTO Designation: R 50-09 (2018)1Technical Section: 4e, Joints, Bearings, and Geosynthetics Release: Group 2 (June) American Association of State Highway and Transportation Officials 444 N
2、orth Capitol Street N.W., Suite 249 Washington, D.C. 20001 TS-4e R 50-1 AASHTO Standard Practice for Geosynthetic Reinforcement of the Aggregate Base Course of Flexible Pavement Structures AASHTO Designation: R 50-09 (2018)1Technical Section: 4e, Joints, Bearings, and Geosynthetics Release: Group 2
3、(June) 1. SCOPE 1.1. This standard practice provides guidance to pavement designers interested in incorporating geosynthetics for the purpose of reinforcing the aggregate base course of flexible pavement structures. Geosynthetic reinforcement is intended to provide structural support of traffic load
4、s over the life of the pavement. 1.1.1. For the purpose of this guide, base reinforcement is the use of a geosynthetic within, or directly beneath, the granular base course. 1.1.2. When referring to geosynthetics, the discussion is limited to geotextiles, geogrids, or geogrid/geotextile composites.
5、2. REFERENCED DOCUMENTS 2.1. AASHTO Standard: M 288, Geotextile Specification for Highway Applications 2.2. Other References: Geosynthetic Materials Association (GMA) White Paper I, “Geosynthetics in Pavement Systems Applications,” May 1999. Available at http:/ Geosynthetic Materials Association (GM
6、A) White Paper II, “Geosynthetic Reinforcement of the Aggregate Base/Subbase Courses of Pavement Structures,” June 2000. Available at http:/ National Highway Institute (NHI) Participant Notebook, Geosynthetic Design and Construction Guidelines, April 1999. Available at www.nhi.fhwa.dot.gov. 3. INTRO
7、DUCTION 3.1. Because the benefits of geosynthetic reinforced pavement structures may not be derived theoretically, test sections are necessary to obtain benefit quantification. Studies have been done that demonstrate the value added by a geosynthetic in a pavement structure. These studies, necessari
8、ly limited in scope, remain the basis for design in this field. A summary of studies is included in GMA White Paper I. 2018 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.TS-4e R 50-2 AASHTO 3.2. This stand
9、ard practice is very empirical in nature and restricted to applications already demonstrated to be useful. The practitioner will need to consult the references and locate a tested section similar to that which is expected in their own design. In that way, the experimentally determined benefit may be
10、 applied to the project being designed. 4. TERMINOLOGY 4.1. Definitions: 4.1.1. base course reduction (BCR)percentage of the base or subbase thickness in a reinforced pavement, as compared to the base or subbase thickness in an unreinforced pavement with the same material components, such that equal
11、 life cycles for a defined failure state result between the two. 4.1.2. separationuse of a geotextile to prevent the mixing of a subgrade soil and an overlying aggregate material. 4.1.3. stabilizationuse of a geotextile in wet, saturated conditions to provide the functions of separation and drainage
12、. 4.1.4. traffic benefit ratio (TBR)ratio of the number of load cycles of a reinforced pavement structure to reach a defined failure state, to the number of loads for the same unreinforced section to reach the same defined failure state. 4.2. DiscussionUse of geotextiles for separation and stabiliza
13、tion applications is covered in M 288 and, therefore, is not included in this guide. 5. SUMMARY OF DESIGN METHOD 5.1. The purpose of this guide is to provide the practitioner with general information regarding the use of a geosynthetic for reinforcement in a pavement structure. The guide will not pr
14、ovide step-by-step procedures for the design of the geosynthetic in this application; instead, overall design considerations are outlined. 5.2. Design procedures use experimentally derived input parameters that are often geosynthetic specific. Thus, computed engineering designs and economic benefits
15、 are not easily translated to other geosynthetics. Users of this document are encouraged to affirm their designs with field verification of the reinforced pavement performance, both in engineering design and economic benefits. 6. SIGNIFICANCE AND USE 6.1. Geosynthetics are used in the pavement struc
16、ture for structural support of traffic loads over the design life of the pavement. The geosynthetic is expected to provide one or both of these benefits: (1) improved or extended service life of the pavement, or (2) reduced thickness of the structural section. 6.2. Service life improvement may be in
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