ASTM D7180-2005(2009) 6250 Standard Guide for Use of Expanded Polystyrene (EPS) Geofoam in Geotechnical Projects《土工工程中膨胀的聚苯乙烯土工泡沫使用的标准指南》.pdf
《ASTM D7180-2005(2009) 6250 Standard Guide for Use of Expanded Polystyrene (EPS) Geofoam in Geotechnical Projects《土工工程中膨胀的聚苯乙烯土工泡沫使用的标准指南》.pdf》由会员分享,可在线阅读,更多相关《ASTM D7180-2005(2009) 6250 Standard Guide for Use of Expanded Polystyrene (EPS) Geofoam in Geotechnical Projects《土工工程中膨胀的聚苯乙烯土工泡沫使用的标准指南》.pdf(3页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D7180 05 (Reapproved 2009)Standard Guide forUse of Expanded Polystyrene (EPS) Geofoam inGeotechnical Projects1This standard is issued under the fixed designation D7180; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, t
2、he year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This guide covers some of the basic considerations forthe use of expanded polystyrene (EPS) geofoam in geot
3、echni-cal projects.1.2 This guide offers a collection of information and doesnot recommend a course of action. This guide cannot replaceeducation or experience and should be used in conjunction withprofessional judgment. Not all aspects of this guide may beapplicable in all circumstances.1.3 This gu
4、ide is not intended to represent or replace thestandard of care by which the adequacy of a given professionalservice must be judged, nor should this guide be appliedwithout consideration of a projects many unique aspects.1.4 The word “standard” in the title of this guide means onlythat this guide ha
5、s been approved through the ASTM Interna-tional consensus process.1.5 The values given in SI units are to be regarded as thestandard. The values in parentheses are for information only.1.6 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is the
6、responsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D4439 Terminology for GeosyntheticsD6817 Specification for Rigid Cellular Polystyrene G
7、eo-foam3. Terminology3.1 DefinitionsTerms used in this guide are defined inTerminology D4439.3.1.1 geofoam, nblock or planar rigid cellular foam poly-meric material used in geotechnical engineering applications.3.2 Definitions of Terms Specific to This Standard:3.2.1 expanded polystyrene, ntype of f
8、oamed plasticformed by the expansion of polystyrene resin beads in amolding process.3.3 Acronyms:3.3.1 EPS, nexpanded polystyrene3.3.2 EPS geofoam, nrigid cellular polystyrene geofoammanufactured from EPS4. Summary of Guide4.1 EPS geofoam is commonly used in geotechnical appli-cations when an extrem
9、ely lightweight material is required.This guide covers some of the considerations that must beevaluated in the design of these projects.5. Significance and Use5.1 This guide informs the user of design considerations inthe use of EPS geofoam which assist in the determination ofthe appropriate EPS geo
10、foam for geotechnical applications.5.2 This guide does not preclude the judgment and practiceof those competent in geotechnical design.6. Design Principles6.1 Design Considerations:6.1.1 Compressive Properties:6.1.1.1 The compressive resistance of EPS geofoam iscovered by Specification D6817. The co
11、mpressive resistancefor geofoam is specified in Specification D6817 and includesthe compressive behavior of EPS geofoam at 1, 5, and 10 %strain.6.1.1.2 A typical limit for many EPS geofoam projects is toconsider the compressive resistance at 1 % strain. The com-pressive behavior at 1 % strain is wit
12、hin the elastic region ofEPS geofoam and provides acceptable short-term deflections inaddition to limiting long-term creep deformation.6.1.1.3 Creep deformations must be accounted for whenlong-term loads exceed the compressive resistance at 1 %strain.1This guide is under the jurisdiction ofASTM Comm
13、ittee D35 on Geosyntheticsand is the direct responsibility of Subcommittee D35.03 on Permeability andFiltration.Current edition approved Nov. 1, 2009. Published January 2010. Originallyapproved in 2005. Last previous edition approved in 2005 as D718005. DOI:10.1520/D7180-05R09.2For referenced ASTM s
14、tandards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocke
15、n, PA 19428-2959, United States.6.1.1.4 At a compressive resistance of 5 % strain, EPSgeofoam is beyond the elastic behavior region and is in theplastic behavior region.6.1.2 Compressive Resistance TestingThe compressiveresistance described in 6.1.1 is determined from the uniformloading of 50-mm (2-
16、in.) cubes at a prescribed loading rate.6.1.3 Load Distribution RequirementsIn applications withlocalized loading exceeding the compressive resistance at 1 %strain, a number of strategies can be used to reduce theeffective load on the EPS geofoam. A common method is theuse of a concrete slab with su
17、itable reinforcement to distributethe load to levels below the compressive resistance at 1 %strain. A sufficient depth of cover material may also be used toreduce the project loads below the compressive resistance at1 % strain.6.1.4 Subgrade RequirementsEPS geofoam is usually in-stalled on a relativ
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