ASTM_A_926_-_03_2014.pdf

Designation:A92603(Reapproved 2014)Standard Test Method forComparing the Abrasion Resistance of Coating Materials forCorrugated Metal Pipe1This standard is issued under the fixed designation A926;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 covers a procedure for comparingmaterials used for coating,paving and lining corrugated metalpipe by use of a bed load abrasion testing machine.Theprocedure attempts to simulate the effect of stone,gravel andsand carried by a stream through corrugated metal pipe.1.2 The values stated in inch-pound units are to be regardedas standard.The SI units given in parentheses are for informa-tion only.1.3 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2A742/A742M Specification for Steel Sheet,Metallic Coatedand Polymer Precoated for Corrugated Steel PipeA849 Specification for Post-Applied Coatings,Pavings,andLinings for Corrugated Steel Sewer and Drainage PipeA929/A929M Specification for Steel Sheet,Metallic-Coatedby the Hot-Dip Process for Corrugated Steel PipeC131 Test Method for Resistance to Degradation of Small-Size Coarse Aggregate by Abrasion and Impact in the LosAngeles MachineC136 Test Method for Sieve Analysis of Fine and CoarseAggregates3.Summary of Test Method3.1 Curved steel panels,coated with the matter to beevaluated,are mounted on the inside surface of a cylindricaldrum.A charge of fine aggregate coarse aggregates and waterare added and the drum is sealed.Then the drum is rotated tocause an abrasive flow over the materials being tested.Afterthe prescribed number of revolutions,the panels are removedfrom the drum,inspected and weighed for loss;or Alternative2 counting grid method is used.4.Significance and Use4.1 This test method provides a means of determining anabrasion rate(weight and calculated average thickness loss)when comparing materials,coatings,pavings,or linings undertest conditions that will be subjected to abrasive bed loads.Theimportance of this information is recognized when dealing withculverts,storm and sanitary sewer applications,although thelast two generally do not have the same degree of abrasion dueto the flatter slopes and less bed loads than culverts.Specifically,the invert of these types of pipe,regardless of thematerial used,can be exposed to flows containing abrasive bedloads or solid particulates that cause wearing of the pipe wall.4.2 By subjecting materials to wear in the bed load abrasionmachine with a controlled bed load charge made up of fineaggregate and coarse aggregate over a specified period,acomparison of the resistance between materials can be estab-lished.4.3 This test method does not simulate the effect of abrasivematerial striking the upstream face of corrugations,as wouldbe typical for coating materials which do not completely fill thecorrugations.NOTE1Caution:This test method uses specific quantitative values toencourage repetitive results and does not consider varying bed loadcharacteristics,ratio of water to bed load,velocity,time or actual fieldconditions,and the effect of exposed edges on laminates.The user mustuse extreme care in comparing one test result to another because of theseand other variables.5.Apparatus5.1 Bed Load Abrasion Machine,equipped with a counterand conforming in all essential characteristics to the designshown in Fig.1.The machine shall consist of a hollow steelcylinder,closed at both ends,having an outside diameter of 246 0.2 in.(610 6 5 mm).One closed end of the cylinder shallhave four bolted plexiglass windows one of which is elongated1This test method is under the jurisdiction of ASTM Committee A05 onMetallic-Coated Iron and Steel Productsand is the direct responsibility of Subcom-mittee A05.17 on Corrugated Steel Pipe Specifications.Current edition approved Aug.1,2014.Published August 2014.Originallyapproved in 1994.Last previous edition approved in 2008 as A926 03(2008).DOI:10.1520/A0926-03R14.2For 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 States1 to provide placement of the specimens.A shaft mountedhorizontal and through the cylinder shall have a drive pulley atone end and be supported by bearings connected to a frameallowing the cylinder to turn freely and be in alignme