1、Designation: C1229 94 (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 adopt
2、ion 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 purport
4、 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:2C1228
5、Practice for Preparing 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
6、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 neare
7、st 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 testsam
8、ple. 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 Splitting
9、 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 c
10、lean 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 k
11、nife from a freshlyproduced, damp, uncured sample panel as 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
12、 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. A
13、fter drying, tap the basket1This 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 May 1, 2015. Published June 2015. Originallyapproved in 1993. La
14、st previous edition approved in 2009 as C1229 94(2009).DOI: 10.1520/C1229-94R15.2For 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
15、onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1of 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 pa
16、rticles. Thelast value 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 re
17、peating 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.
18、1 %.9. Calculations9.1 Glass fiber content in a washout coupon is calculated asfollows:glass fiber content 5W3 2 W1W2 2 W13100 (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 orig
19、inalmass.NOTE 3If the 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 ratio (2)5glass fiber content in top,
20、 %glass fiber content in the bottom,%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);
21、wash-out testASTM International 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 suc
22、h rights, are entirely 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 addit
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24、 ASTM Committee on Standards, 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
25、aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 1 Splitting JigFIG. 2 Procedure for Determination of Glass Fiber ContentC1229 94 (2015)2
