1、Designation:C122994(Reapproved 2015)Standard Test Method forDetermination of Glass Fiber Content in Glass FiberReinforced Concrete(GFRC)(Wash-Out Test)1This standard is issued under the fixed designation C1229;the number immediately following the designation indicates the year oforiginal adoption or
2、,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 determination of the fibercontent in an uncured,glass fiber re
3、inforced concrete(GFRC)sample panel.1.2 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.1.3 This standard does not purport to address all
4、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:2C1228 Practice for Prepari
5、ng Coupons for Flexural andWashout Tests on Glass Fiber Reinforced Concrete3.Terminology3.1 Definitions:3.1.1 glass fiber reinforced concrete(GFRC)a composi-tion of cementitious material,aggregates,water,admixtures,and alkali-resistant glass fiber.4.Significance and Use4.1 Glass fiber contents,deter
6、mined by this test method,areuseful for quality control of GFRC products to ensure thatmanufacturing equipment has been set up to deliver the correctproportions of glass fiber reinforcement in a GFRC composite.5.Apparatus5.1 Balance,2 kg capacity,sensitive to the nearest 0.1 g.5.2 Mesh Basket or Str
7、ainer,approximately 30 in.3(493cm3)capacity of woven stainless steel wire and mesh sizebetween316(4.5 mm)and116(1.5 mm).Overall dimensionsmust totally accept the test sample without any overhang,anddepth should be approximately twice the thickness of the testsample.Gage and construction must be such
8、 that meshdimension cannot easily enlarge,allowing glass reinforcementto escape.5.3 Drying Chamber,an oven that can be set at 230 6 10F(110 6 10C),or a muffle furnace set at 900 6 10F(482 610C).5.4 Razor Knife,capable of 6 in.blade extension.5.5 Splitting Jig,see Fig.1.6.Sampling6.1 Sampling should
9、be in accordance with governingspecifications.7.Test Specimens7.1 Cut the coupons with a razor knife from a freshly cast,damp,uncured sample panel.When cutting out the test coupon,the sample panel shall have sufficient cohesiveness such that:(a)a clean cut can be made without pulling out fibers from
10、 thetest coupon or the adjacent material,and(b)that material is notlost from the test coupon prior to determining mass.7.2 The test specimen shall be between 12 in.2(78 cm2)and16 in.2(103 cm2).8.Procedure8.1 Cut two test coupons with a razor knife from a freshlyproduced,damp,uncured sample panel as
11、done in PracticeC1228.Place the coupons in a mesh basket of known mass(W 1)and record the total mass(W2).The basket and contentsare held under a stream of running water and the composite isworked with fingers to break it up.Take care to ensure that noglass is lost.See Fig.2.8.2 When all the cement a
12、nd fine aggregate(if any)arewashed away,dry the basket and contents in an oven at 230 610F(110 6 10C),(or muffle furnace at 900 6 10F(483 610C)to a constant mass,as determined by taking threemeasurements at 10 min intervals.After drying,tap the basket1This test method is under the jurisdiction of AS
13、TM Committee C27 on PrecastConcrete Products and is the direct responsibility of Subcommittee C27.40 on GlassFiber Reinforced Concrete.Current edition approved May 1,2015.Published June 2015.Originallyapproved in 1993.Last previous edition approved in 2009 as C1229 94(2009).DOI:10.1520/C1229-94R15.2
14、For 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
15、 Conshohocken,PA 19428-2959.United States1 of dried glass against the countertop to dislodge adhered sandparticles that would induce an error in the glass contentmeasurement.Be careful not to lose any glass particles.Thelast value of mass is recorded as W3,provided it differs fromthe previous value
16、by less than 0.1%.NOTE1Microwave ovens should not be used to dry glass fiber.NOTE2If desired or required,a measure of the glass fiber distributionthrough the thickness of the coupon can be obtained by repeating theprocedure on coupons slit into two halves through the thickness using thesplitting jig as shown in Fig.1.If this is done,the two halves should haveapproximately equal mass.8.3 Record the final value of mass as W 3,provided it differsfrom the previous weight measurement by less than 0.1
