ASTM C1777-2013 Standard Test Method for Rapid Determination of the Methylene Blue Value for Fine Aggregate or Mineral Filler Using a Colorimeter《细集料或矿物填料亚甲基蓝值快速测定用标准试验方法》.pdf
《ASTM C1777-2013 Standard Test Method for Rapid Determination of the Methylene Blue Value for Fine Aggregate or Mineral Filler Using a Colorimeter《细集料或矿物填料亚甲基蓝值快速测定用标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM C1777-2013 Standard Test Method for Rapid Determination of the Methylene Blue Value for Fine Aggregate or Mineral Filler Using a Colorimeter《细集料或矿物填料亚甲基蓝值快速测定用标准试验方法》.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: C1777 13Standard Test Method forRapid Determination of the Methylene Blue Value for FineAggregate or Mineral Filler Using a Colorimeter1This standard is issued under the fixed designation C1777; 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 provides a rapid test to determine theamount of methylene blue a
3、dsorbed by a specimen of fineaggregate or mineral filler and can be used both in thelaboratory and in the field.1.2 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all of thesafety c
4、oncerns, 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:2C125 Terminology Relating to Concret
5、e and Concrete Ag-gregatesC702 Practice for Reducing Samples ofAggregate to TestingSizeD75 Practice for Sampling AggregatesE11 Specification for Woven Wire Test Sieve Cloth and TestSieves2.2 Other Standards:AASHTO T330 Standard Method of Test for the QualitativeDetection of Harmful Clays of the Smec
6、tite Group inAggregates Using Methylene Blue3EN 933-9 Tests for geometrical properties of aggregates.Part 9: Assessment of fines Methylene blue test43. Terminology3.1 Definitions:3.1.1 For definitions of terms used in this standard, refer toTerminology C125.3.2 Definitions of Terms Specific to This
7、Standard:3.2.1 mineral filler, na finely divided mineral product atleast 65 % of which passes the 75-m sieve.4. Summary of Test Method4.1 A specimen of fine aggregate or mineral filler is com-bined with a methylene blue solution of known concentrationand mixed for a prescribed period of time. The sp
8、ecimenadsorbs some of the methylene blue from solution. Theresulting mixture is filtered and a portion of the filtered solutionis diluted by a fixed amount.Acolorimeter is used to determinethe absorbance of the diluted solution, from which the concen-tration of methylene blue prior to dilution is ca
9、lculated. Thechange in concentration of methylene blue before and aftermixing with fine aggregate or mineral filler is converted to amethylene blue value and reported in units of mg/g.5. Significance and Use5.1 This test method is used to determine rapidly the amountof methylene blue adsorbed by a s
10、pecimen of fine aggregate ormineral filler. The result is reported as a methylene blue valuein units of mg of methylene blue adsorbed per g of fineaggregate or mineral filler. The methylene blue value is afunction of the amount and characteristics of clay mineralspresent in the test specimen. High m
11、ethylene blue valuesindicate increased potential for diminished fine aggregate ormineral filler performance in a cementitious mixture due to thepresence of clays.NOTE 1Results from this test method are not expected to be correlatedwith those obtained using AASHTO T 330 or EN 933-9. These three testm
12、ethods are likely to give very different numerical values even though theunits are the same. The AASHTO T 330 test is performed only on thefraction of an aggregate passing the 75 m sieve, the EN 933-9 test isperformed only on the fraction finer than 2 mm, and this test is performedon the fraction fi
13、ner than the 4.75 mm sieve. Therefore, when testing thesame fine aggregate source, the AASHTO test method would give thehighest methylene blue value because any clay present in the specimenwould be concentrated in the fraction finer than the 75 m sieve. TheAASHTO and EN test methods do not take into
14、 account the amount of1This test method is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregates and is the direct responsibility of SubcommitteeC09.20 on Normal Weight Aggregates.Current edition approved Nov. 1, 2013. Published November 2013. DOI:10.1520/C1777-132For refer
15、enced 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.3Available from American Association of State Highway and Transportatio
16、nOfficials (AASHTO), 444 N. Capitol St., NW, Suite 249, Washington, DC 20001,http:/www.transportation.org.4Available from European Committee for Standardization, Avenue Marnix 17,B-1000 Brussels, Belgium.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-29
17、59. United States1material passing the 75 m sieve or 2 mm sieve, respectively. Forexample, a fine aggregate with high methylene blue value measured by theAASHTO method but low percentage passing the 75 m sieve may haveless effect on concrete performance than a fine aggregate with lowmethylene blue v
18、alue measured by the AASHTO method but a highpercentage passing the 75 m sieve. In contrast, this test method expressesmethylene blue value based on the entire fine aggregate or mineral fillerspecimen.Additionally, theAASHTO and EN test methods use titration todetermine the amount of methylene blue
19、of known concentration that isadsorbed by a specimen and require the operator to visually determine theend point of the test. In contrast, this test method uses a colorimeter todetect the change in concentration of methylene blue solution before andafter being mixed with the fine aggregate or minera
20、l filler specimen.NOTE 2Recommendations for maximum methylene blue values forspecific applications are not provided in this test method. Maximummethylene blue values should be established based on successful perfor-mance of fine aggregate or mineral filler in the applications underconsideration.6. I
21、nterferences6.1 Methylene blue will degrade when exposed to light.Store in darkness. No appreciable degradation occurs duringthe time it takes to complete the test method.6.2 Methylene blue will stain glassware and plastic ware.Therefore, do not reuse such apparatus.7. Apparatus7.1 4.75-mm sieve con
22、forming to E11.7.2 Mass Balance having a capacity of 50 g or more andcapable of measuring to the nearest 0.1 g or less.7.3 Micropipette capable of measuring to the nearest 1 L.7.4 Colorimeter capable of reading absorbance of a speci-men at a wavelength of 610 6 1 nm at operating temperaturesof at le
23、ast 0 to 50C. The colorimeter shall be able to readabsorbance between zero and the absorbance associated with a0.144 % mass concentration of methylene blue solution.7.5 Disposable items for each testtwo plastic 50-mL testtubes, one plastic 1-mL vial, one 3-mL syringe with Luer-Lokadapter, one 0.2-m
24、syringe filter, one colorimeter glass cuvette(or sample cell), one micropipette tip, and two transfer pipettes.7.6 Additional disposable items for confirming methyleneblue starting concentrationplastic 50-mL test tube, colorim-eter glass cuvette, micropipette tip, and transfer pipette.7.7 Additional
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