ASTM_C_1560_-_03_2016.pdf

Designation:C156003(Reapproved 2016)Standard Test Method forHot Water Accelerated Aging of Glass-Fiber ReinforcedCement-Based Composites1This standard is issued under the fixed designation C1560;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 provides a way of accelerating theaging of glass fiber reinforced cementitious composites inorder to develop data that will indicate real-life naturalweathering performance.1.2 The coupons prepared for this test method will be testedusing Test Method C947.1.3 This test method can be used to age coupons for othertest methods.1.4 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.5 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:2C947 Test Method for Flexural Properties of Thin-SectionGlass-Fiber-Reinforced Concrete(Using Simple BeamWith Third-Point Loading)C1228 Practice for Preparing Coupons for Flexural andWashout Tests on Glass Fiber Reinforced Concrete3.Significance and Use3.1 The basis for this test as an indicator of the long termbehavior of fiber reinforced composites is that elevated tem-perature and moisture content accelerate the formation of theproducts of hydration of the cement in the matrix,particularlycalcium hydroxide.3.1.1 It is known that the interaction of these products ofhydration,particularly calcium hydroxide,with the fibers canhave a major effect on the long-term properties of the compos-ites.3.1.2 The principal mechanism that occurs is that thecalcium hydroxide forms within the bundles of filaments thatform the glass fiber strand.This gradually bonds the filamentstogether,which reduces filament pull-out.This causes a reduc-tion in the strain capacity of the composite,thereby reducingthe strength of the composite and changing the composite froma ductile material to an increasingly brittle material.3.1.3 Accelerating the formation of the hydration productsaccelerates their interaction with the fibers,hence acceleratingthe aging of the composite.3.2 The data developed from this test are used by research-ers and manufacturers to evaluate the long-term performanceof different mixtures,reinforcements,mixture components,andto provide data for the development of design procedures forproducts made from these composites.3.2.1 The recorded data also provides screening informationas new matrices and reinforcements are developed.3.3 The usefulness of the test as an indicator of long termcomposite performance is valid if the only reactions that areaccelerated are those that occur more slowly under naturalweathering,hot water can induce effects in some composites,for instance those containing acrylic polymer,that may notoccur in natural weathering.This test method may not be avalid indicator of long-term performance of such composites.4.Apparatus4.1 Aging TanksTank material can be but not limited to,plastic,insulated to maintain a stable temperature.Insulationshould cover all exterior surfaces including the cover.Insula-tion can be a foam product as used in building construction.4.1.1 The size of the tank is typically 12 in.deep(300 mm),18 in.wide(450 mm),and 20 to 36 in.(600 to 900 mm),inlength.Size is determined by the amount of coupons to beprocessed and the ability to maintain stable temperatures.1This test method is under the jurisdiction of ASTM Committee C27 on PrecastConcrete Products and is the direct responsibility of Subcommittee C27.40 on GlassFiber Reinforced Concrete.Current edition approved April 1,2016.Published May 2016.Originallyapproved in 2003.Last previous edition approved in 2009 as C1560 03(2009).DOI:10.1520/C1560-03R16.2For 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 Water temperature in several medium sized tanks is easier tocontrol than one large tank.4.2 Heating UnitAn immersion unit with rheostat forcontrolling temperature,such as those used for aquariums,hasbeen found to be satisfactory.4.3 ThermometerA standard immersion,laboratory ther-mometer is used to monitor temperature.More sophisticatedrecorders can also be used.4.4 ImmersionRackArackbuiltfrom