ASTM D7172-2006e1 374 Standard Test Method for Determining The Relative Density (Specific Gravity) And Absorption Of Fine Aggregates Using Infrared《相对密度(比重)和用红外线对细集料吸收测定的标准试验方法》.pdf
《ASTM D7172-2006e1 374 Standard Test Method for Determining The Relative Density (Specific Gravity) And Absorption Of Fine Aggregates Using Infrared《相对密度(比重)和用红外线对细集料吸收测定的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D7172-2006e1 374 Standard Test Method for Determining The Relative Density (Specific Gravity) And Absorption Of Fine Aggregates Using Infrared《相对密度(比重)和用红外线对细集料吸收测定的标准试验方法》.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D 7172 061Standard Test Method forDetermining The Relative Density (Specific Gravity) AndAbsorption Of Fine Aggregates Using Infrared1This standard is issued under the fixed designation D 7172; the number immediately following the designation indicates the year oforiginal adoption or, i
2、n 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.1NOTE“2 in.” was editorially corrected to “27 in.” in Section 9.3.9 in March 2009.1. Scope1.1
3、This test method covers the determination of the relativedensity (specific gravity) and absorption of fine aggregates.1.2 The values stated in SI units are to be regarded as thestandard.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is th
4、eresponsibility 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 29/C 29M Test Method for Bulk Density (“Unit Weight”)and Voids in AggregateC 125 Ter
5、minology Relating to Concrete and ConcreteAggregatesC 128 Test Method for Density, Relative Density (SpecificGravity), and Absorption of Fine AggregateC 566 Test Method for Total Evaporable Moisture Contentof Aggregate by DryingC 670 Practice for Preparing Precision and Bias Statementsfor Test Metho
6、ds for Construction MaterialsC 702 Practice for Reducing Samples of Aggregate toTesting SizeC 1252 Test Methods for Uncompacted Void Content ofFine Aggregate (as Influenced by Particle Shape, SurfaceTexture, and Grading)D8 Terminology Relating to Materials for Roads and Pave-mentsD75 Practice for Sa
7、mpling AggregatesD 4753 Guide for Evaluating, Selecting, and SpecifyingBalances and Standard Masses for Use in Soil, Rock, andConstruction Materials Testing2.2 AASHTO Standards:3T-84 Test Method for Specific Gravity and Absorption ofFine Aggregate2.3 Other Documents:4Operational Instructions3. Termi
8、nology3.1 DefinitionsAs defined in C 125 and D83.1.1 Automatic Volumetric Mixer (AVM), nan automatedunit to hold and agitate a volumetric flask while applying avacuum to the flask.4. Significance and Use4.1 Bulk relative density (specific gravity) is the character-istic generally used for calculatio
9、n of the volume occupied bythe aggregate in various mixtures containing aggregate includ-ing Portland cement concrete, bituminous concrete, and othermixtures that are proportioned or analyzed on an absolutevolume basis. Bulk relative density (specific gravity) is used inthe computation of voids in a
10、ggregate in C 1252 and C 29/C 29M. Bulk relative density (specific gravity) determined onthe saturated surface dry (SSD) basis is used if the aggregate iswet, that is, if its absorption has been satisfied. Conversely, thebulk relative density (specific gravity) determined on the oven-dry basis is us
11、ed for computations when the aggregate is dry orassumed to be dry.4.2 Apparent relative density (specific gravity) pertains tothe relative density of the solid material making up theconstituent particles not including the pore space within theparticles that is accessible to water. This value is not
12、widelyused in construction aggregate technology.4.3 Water absorption values are used to calculate the changein the mass of an aggregate due to water absorbed in the porespaces within the constituent particles, compared to the drycondition, when it is deemed that the aggregate has been in1This test m
13、ethod is under the jurisdiction of ASTM Committee D04 on Roadand Paving Materials and is the direct responsibility of Subcommittee D04.51 onAggregate Tests.Current edition approved Feb. 15, 2006. Published March 2006.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact AST
14、M 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 TransportationOfficials (AASHTO), 444 N. Capitol St., NW, Suite 249, Washington, DC 20
15、001.4Available from Barnstead International, 2555 Kerper Boulevard, P.O. Box 797,Dubuque, Iowa 52004-0797, U.S.A.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.contact with water long enough to satisfy most of the absorp-tion potent
16、ial. The laboratory standard for absorption is thatobtained after submerging dry aggregate for approximately 24hours in water. Aggregates mined from below the water tablemay have a higher absorption when used, if not allowed to dry.Conversely, some aggregates when used may contain anamount of absorb
17、ed moisture less than the 24 hours soakedcondition: For an aggregate that has been in contact with waterand that had free moisture on the particle surface, the percent-age of free moisture can be determined by deducting theabsorption from the total moisture content determined accord-ing to C 566 by
18、drying.5. Apparatus5.1 BalanceAbalance or scale, conforming to the require-ments of D 4753, accurate and readable to within 0.1 % of thetest sample mass at any point within the range of use.5.2 ThermometerShall be capable of accurately measur-ing the temperature throughout a range of 0 to 50 C, and
19、bereadable to 0.5 C (1 F).5.3 Large Neck Volumetric Flaskwith a capacity of 500mL.5.4 Timercapable of at least 5 minutes.5.5 AVM Unit (Automatic Volumetric Mixer)The unitshall perform an automated process for removing entrapped air.It shall consist of the following devices: an orbiting mixer thatcan
20、 securely hold a 500 mL large neck volumetric flask, aclamp and clamping rod capable of securely holding the neckof the volumetric flask, a vacuum pump, hose, and a stoppercapable of fitting the mouth of the volumetric flask. (See Note1)5.6 Infrared UnitThe device shall be automatically ca-pable of
21、detecting SSD using an infrared source and detector.It shall consist of an orbital mixer, water pump, infrared source,infrared detector, and a mixing bowl with a lid. The lid of themixing bowl shall consist of two sapphire lenses and contain aninjection nozzle for water injection. (See Note 1)NOTE 1
22、Units similar to the SSDetect manufactured by BarnsteadInternational5meet criteria described in Sections 5.3, 5.5 and 5.65.7 Distilled Water6. Sampling6.1 Sampling shall be accomplished in accordance withPractice D75.7. Preparation of Test Specimen7.1 Obtain 1.5 kg 6 10 g of the fine aggregate from
23、thesample using the applicable procedures described in PracticeC 702.7.2 Dry it in a suitable pan or vessel to constant mass at atemperature of 110 6 5C (230 6 9F). Allow it to cool to 236 2.0C (73 6 3F).7.3 Split the test sample according to Practice C 702 intotwo 500 6 5g samples. Discard excess.8
24、. Calibration8.1 Calibration of the water pump and the infrared unit shallbe performed once a month.8.2 Calibration of Water Pump:8.2.1 Fill the infrared device with distilled water per manu-facturers instructions.8.2.2 Weigh a clean container. Place the container under thenozzle in the lid to colle
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