1、Designation:D805819Standard Test Method forDetermining the Flexural Strength of a GeosyntheticCementitious Composite Mat(GCCM)Using the Three-PointBending Test1This standard is issued under the fixed designation D8058;the number immediately following the designation indicates the year oforiginal ado
2、ption 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 provides guidelines for testing theflexural strength of cured
3、 geosynthetic cementitious compositemat(GCCM)products in a three(3)-point bend apparatus.1.2 The values in SI units are to be regarded as the standard.Values in inch-pound units are in parentheses for information.1.3 This standard may involve hazardous operations,equipment,and climates.This standard
4、 does not purport toaddress all of the safety concerns,if any,associated with itsuse.It is the responsibility of the user of this standard toestablish appropriate safety,health,and environmental prac-tices and determine the applicability of regulatory limitationsprior to use.1.4 This international s
5、tandard 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.Re
6、ferenced Documents2.1 ASTM Standards:2D76/D76M Specification for Tensile Testing Machines forTextilesD4354 Practice for Sampling of Geosynthetics and RolledErosion Control Products(RECPs)for TestingD4439 Terminology for GeosyntheticsD8030/D8030M Practice for Sample Preparation for GCCM3.Terminology3
7、.1 For definitions of common technical terms used in thisstandard,refer to Terminology D4439.3.2 Definitions:3.2.1 cured,adja description of the state of a GCCM afterhydration for a specified period of time and quantity of waterwhen known under specified conditions,followed by a periodof time where
8、the GCCM is kept under a specified environ-mental condition during which the cementitious material con-tinues to cure and develop compressive strength.3.2.2 curing time,nthe time subsequent to initial hydra-tion of the GCCM and immediately prior to the testing of thematerial,during which the cementi
9、tious material is allowed toharden and form its final strength using the specific process forcuring as specified in 8.3.3.2.3 dry,adja description of the state of a GCCM beforeit has been exposed to a hydration source and typicallydescribes the“as-received”dry product after conditioning in aprescrib
10、ed manner.3.2.4 final breaking load,nthe maximum load achievedprior to rupture of materials.3.2.5 final deflectionthe deflection of the specimen fromits initial position(before testing begins)measured at mid spanat the final breaking load.3.2.6 final flexural strength,nthe final flexural strength,ex
11、pressed in megapascals(pound-force per square inch),iscalculated from the final breaking load of a hydrated and curedGCCM specimen,oriented in either the machine or cross-machine direction,loaded as simple beams,when breaks occurperpendicular to the specimen length,with the load applied atthe center
12、,in a three-point loading fixture.3.2.7 hydration,nexposure of the GCCM,in this case,towater in prescribed conditions for a prescribed time and waterquantity when known.3.2.8 initial breaking load,nthe maximum load at whichthe first crack in the cementitious matrix of the GCCM forms.3.2.9 initial de
13、flection,nthe deflection of the specimenfrom its initial position(before testing begins)measured at midspan at the initial breaking load.3.2.10 initial flexural strength,nthe initial flexuralstrength,expressed in megapascals(pound-force per squareinch),is calculated from the initial breaking load(ma
14、ximum1This test method is under the jurisdiction of ASTM Committee D35 onGeosynthetics and is the direct responsibility of Subcommittee D35.05 on Geosyn-thetic Erosion Control.Current edition approved Jan.1,2019.Published January 2019.Originallyapproved in 2017.Last previous edition approved in 2017
15、 as D8058 17.DOI:10.1520/D8058-19.2For 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
16、 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 load at first crack)of a hydrated and cured GCCM specimen,oriented in either the machine or cross-machine di
