ASTM_D_6638_-_18.pdf

Designation:D663818Standard Test Method forDetermining Connection Strength Between GeosyntheticReinforcement and Segmental Concrete Units(ModularConcrete Blocks)1This standard is issued under the fixed designation D6638;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the 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 test method is used to determine the connectionproperties between a layer of geosynthetic reinforcement andsegmental concrete block units used in construction of rein-forced soil retaining walls.The test is carried out underconditions determined by the user that reproduce the connec-tion system at full scale.The results of a series of tests are usedto define a relationship between connection strength for asegmental unit-geosynthetic connection system and normalload.1.2 This is a performance test used to determine propertiesfor design of retaining wall systems utilizing segmental con-crete units and soil reinforcing geosynthetics,either geotextilesor geogrids.The test is performed on a full-scale constructionof the connection and may be run in a laboratory or the field.1.3 The values stated in SI units are regarded as thestandard.The values stated in inch-pound units are providedfor information only.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D448 Classification for Sizes of Aggregate for Road andBridge ConstructionD4354 Practice for Sampling of Geosynthetics and RolledErosion Control Products(RECPs)for TestingD4439 Terminology for GeosyntheticsD4495 Test Method for Impact Resistance of Poly(VinylChloride)(PVC)Rigid Profiles by Means of a FallingWeightD6637/D6637M Test Method for Determining Tensile Prop-erties of Geogrids by the Single or Multi-Rib TensileMethod3.Terminology3.1 Definitions:3.1.1 displacement criteria,na user-prescribed maximummovement,mm(in.),of the geosynthetic reinforcement outfrom the back of segmental concrete units.3.1.2 geosynthetic,na planar product manufactured frompolymeric material used with soil,rock,earth,or other geo-technical engineering-related material as an integral part of amanmade project,structure,or system.D44393.1.3 granular infill,ncoarse-grained soil aggregate usedto fill the voids in and between segmental concrete units.3.1.4 peak connection strength,nthe maximum tensilecapacity of the connection between geosynthetic reinforcementand segmental concrete units.3.1.5 segmental concrete unit(modular concrete block),na concrete unit manufactured specifically for mortarless,dry-stack retaining wall construction.1This test method is under the jurisdiction of ASTM Committee D35 onGeosynthetics and is the direct responsibility of Subcommittee D35.01 on Mechani-cal PropertiesCurrent edition approved July 15,2018.Published August 2018.Originallyapproved in 2001.Last previous edition approved in 2011 as D6638 11.DOI:10.1520/D6638-18.2For referenced ASTM standards,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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 3.1.6 segmental concrete unit width,nthe segmental con-crete unit dimension parallel to the wall face and coincidentwith the geosynthetic reinforcement test specimen width.3.1.7 service-state connection strength,nthe connectiontensile capacity at a service-state displacement criterion be-tween geosynthetic reinforcement and segmental concreteunits.3.2 For definitions of other terms relating to geosynthetics,refer to Terminology D4439.4.Summary of Test Method4.1 One end of a wide geosynthetic reinforcement testspecimen is attached to dry-stacked segmental concrete blockunits assembled as specified by the user.The other end of thetest specimen is attached to a clamp,which is part of a