1、Designation: C 1229 94 (Reapproved 2001)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 (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers determination of the fibercontent in an uncure
3、d, glass fiber reinforced concrete (GFRC)sample panel.1.2 The values stated in inch-pound units are to be regardedas the standard. The values given in parentheses are providedfor information only.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use
4、. 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:C 1228 Practice for Preparing Coupons for Flexural andWashout Tests on Glass
5、Fiber Reinforced Concrete23. 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 Use4.1 Glass fiber contents, determined by this test method, areuseful for qu
6、ality 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 Strainer, approximately 30 in.3(493cm3) ca
7、pacity 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 that meshdimension cannot easi
8、ly 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 be in accordance with
9、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 thetest coupon or
10、 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 done in Pra
11、cticeC 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 to ensure that noglass is lost. See Fig. 2.8.2 When all the cement and
12、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 basketof dried glass against the countertop to d
13、islodge 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 by less than 0.1 %.NOTE 1Microwave ovens should not be used to dry glass fiber.NOT
14、E 2If desired or required, a measure of the glass fiber distribution1This 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 Made by the Spray-Up Process.Current edition app
15、roved Oct. 15, 1994. Published December 1994. Originallypublished as C 1229 93. Last previous edition C 1229 93.2Annual Book of ASTM Standards, Vol 04.05.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.through the thickness of the co
16、upon 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 m
17、easurement by less than 0.1 %.9. Calculations9.1 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
18、nearest 0.1 percent of originalmass.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 ratio5glas
19、s fiber content in top, %glass fiber content in 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 r
20、einforced concrete (GFRC);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
21、riskof infringement of such 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
22、this standard or for additional standardsand should 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 shouldma
23、ke your views known to the 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 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 12292
