1、Designation: C 1229 94 (Reapproved 2009)Standard Test Method forDetermination of Glass Fiber Content in Glass FiberReinforced Concrete (GFRC) (Wash-Out Test)1This standard is issued under the fixed designation C 1229; 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 covers determination of the fibercontent in an uncured
3、, glass fiber reinforced 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 purpo
4、rt 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:2C 12
5、28 Practice for Preparing Coupons for Flexural andWashout Tests on Glass Fiber Reinforced Concrete3. Terminology3.1 Definition: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.
6、1 Glass fiber contents, determined 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 nea
7、rest 0.1 g.5.2 Mesh Basket or Strainer, 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 tests
8、ample. Gage and construction must be such 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 Splitti
9、ng Jig, see Fig. 1.6. Sampling6.1 Sampling should 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
10、 clean cut can be made without pulling out fibers from 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
11、 knife from a freshlyproduced, damp, uncured sample panel as done in PracticeC 1228. 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
12、 to ensure that noglass is lost. See Fig. 2.8.2 When all the cement and 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
13、. After drying, tap the basketof dried glass against the countertop to dislodge adhered sand1This 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
14、 May 1, 2009. Published May 2009. Originallyapproved in 1993. Last previous edition approved in 2001 as C 1229 94(2001).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
15、 to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.particles that would induce an error in the glass contentmeasurement. Be careful not to lose any glass particles. Thelast valu
16、e of mass is recorded as W3, provided it differs fromthe previous value by less than 0.1 %.NOTE 1Microwave ovens should not be used to dry glass fiber.NOTE 2If desired or required, a measure of the glass fiber distributionthrough the thickness of the coupon can be obtained by repeating theprocedure
17、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 %.9. Calculations9.
18、1 Glass fiber content in a washout coupon is calculated asfollows:glass fiber content 5W3 2 W1W2 2 W13 100 (1)where:W1 = mass of basket, g,W2 = mass of basket plus coupon, g, andW3 = mass of basket plus glass (after drying), g.Record mass change to the nearest 0.1 percent of originalmass.NOTE 3If th
19、e procedure in Note 2 is followed, the glass fiberdistribution through the thickness can be calculated by measuring the glassfiber contents in the two split halves and expressing them (to the nearest0.1) as a top to bottom ratio.Top to bottom ratio5glass fiber content in top, %glass fiber content in
20、 the bottom,%(2)10. Precision and Bias10.1 PrecisionThe precision of this test method is beingdetermined.10.2 BiasSince there is no accepted reference material,the bias of this test method cannot be determined.11. Keywords11.1 glass fiber; glass fiber reinforced concrete (GFRC);wash-out testASTM Int
21、ernational takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirel
22、y their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand sh
23、ould be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on St
24、andards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).FIG. 1 Splitting JigFIG. 2 Procedure for Determination of Glass Fiber ContentC 1229 94 (2009)2
