1、Designation: C566 97 (Reapproved 2004)C566 13Standard Test Method forTotal Evaporable Moisture Content of Aggregate by Drying1This standard is issued under the fixed designation C566; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision,
2、 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.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This test method covers
3、the determination of the percentage of evaporable moisture in a sample of aggregate by drying bothsurface moisture and moisture in the pores of the aggregate. Some aggregate may contain water that is chemically combined withthe minerals in the aggregate. Such water is not evaporable and is not inclu
4、ded in the percentage determined by this test method.1.2 The values stated in SI units are to be regarded as the standard. The values stated in parentheses are No other units ofmeasurement are included in this standard.NOTE 1Sieve size is identified by its standard designation in Specification E11.
5、The alternative designation given in parentheses is for informationonly and does not represent a different standard sieve size.provided for information only.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user
6、of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use. For specific precautionary statements, see 5.3.1, 7.2.1, and 7.3.1.2. Referenced Documents2.1 ASTM Standards:2C29/C29M Test Method for Bulk Density (“Unit Weig
7、ht”) and Voids in AggregateC125 Terminology Relating to Concrete and Concrete AggregatesC127 Test Method for Density, Relative Density (Specific Gravity), and Absorption of Coarse AggregateC128 Test Method for Density, Relative Density (Specific Gravity), and Absorption of Fine AggregateC670 Practic
8、e for Preparing Precision and Bias Statements for Test Methods for Construction MaterialsD75 Practice for Sampling AggregatesE11 Specification for Woven Wire Test Sieve Cloth and Test Sieves2.2 Other Document:National Research Council Report SHRP-P-61933. Terminology3.1 Definitions:3.1.1 For definit
9、ions of terms used in this test method, refer to Terminology C125.4. Significance and Use4.1 This test method is sufficiently accurate for usual purposes, such as adjusting batch quantities of ingredients for concrete.It will generally measure the moisture in the test sample more reliably than the s
10、ample can be made to represent the aggregatesupply. In cases where the aggregate itself is altered by heat, or where more refined measurement is required, the test should beconducted using a ventilated, controlled temperature oven.1 This test method is under the jurisdiction of ASTM Committee C09 on
11、 Concrete and Concrete Aggregatesand is the direct responsibility of Subcommittee C09.20 onNormal Weight Aggregates.Current edition approved February 1, 2004Feb. 1, 2013. Published March 2004February 2013. Originally approved in 1965. Last previous edition approved in 19972004as C566 97.C566 97 (200
12、4). DOI: 10.1520/C0566-97R04.10.1520/C0566-13.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.3 Available fro
13、m the National Research Council, 2101 Constitution Ave., N.W., Washington, DC 20418.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to ad
14、equately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshoh
15、ocken, PA 19428-2959. United States14.2 Large particles of coarse aggregate, especially those larger than 50 mm (2 in.), mm, will require greater time for the moistureto travel from the interior of the particle to the surface. The user of this test method should determine by trial if rapid dryingmet
16、hods provide sufficient accuracy for the intended use when drying large size particles.5. Apparatus5.1 BalanceA balance or scale accurate, readable, and sensitive to within 0.1 % of the test load at any point within the rangeof use. Within any interval equal to 10 % of the capacity of the balance or
17、 scale used to determine mass, the load indication shallbe accurate within 0.1 % of the difference in masses.5.2 Source of HeatA ventilated oven capable of maintaining the temperature surrounding the sample at 110 6 5C (230 69F). 5C. Where close control of the temperature is not required (see 4.1),
18、other suitable sources of heat may be used, such asan electric or gas hot plate, electric heat lamps, or a ventilated microwave oven.5.3 Sample ContainerA container not affected by the heat, of sufficient volume to contain the sample without danger ofspilling, and of such shape that the depth of sam
19、ple will not exceed one fifth of the least lateral dimension.5.3.1 PrecautionWhen a microwave oven is used, the container shall be nonmetallic.NOTE 2Except for testing large samples, an ordinary frying pan is suitable for use with a hot plate, or any shallow flat-bottomed metal pan is suitablewith h
20、eat lamps or oven. Note the precaution in 5.3.1.5.4 StirrerA metal spoon or spatula of convenient size.6. Sampling6.1 Sample in accordance with Practice D75, except for the sample size.6.2 Secure a sample of the aggregate representative of the moisture content in the supply being tested and having a
21、 mass notless than the amount listed in Table 1. Protect the sample against loss of moisture prior to determining the mass.7. Procedure7.1 Determine the mass of the sample to the nearest 0.1 %.TABLE 1 Sample Size for AggregateNominal Maximum Sizeof Aggregate, mm (in.)AMass of Normal WeightAggregate
22、Sample, min, kgB4.75 (0.187) (No. 4) 0.59.5 (38) 1.512.5 (12) 219.0 (34) 325.0 (1) 437.5 (112) 650 (2) 863 (212) 1075 (3) 1390 (312) 16100 (4) 25150 (6) 50TABLE 1 Sample Size for AggregateNominal Maximum Sizeof Aggregate, mm (in.)AMass of Normal WeightAggregate Sample, min, kgB4.75 (0.187) (No. 4) 0
23、.59.5 (38) 1.512.5 (12) 219.0 (34) 325.0 (1) 437.5 (112) 650 (2) 863 (212) 1075 (3) 1390 (312) 16100 (4) 25150 (6) 50A Based on sieves meeting Specification E11.B Determine the minimum sample mass for lightweight aggregate by multiplyingthe value listed by the dry-loose unit mass of the aggregate in
24、 kg/m3 (determinedusing Test Method C29/C29M) and dividing by 1600.C566 1327.2 Dry the sample thoroughly in the sample container by means of the selected source of heat, exercising care to avoid lossof any particles. Very rapid heating may cause some particles to explode, resulting in loss of partic
25、les. Use a controlled temperatureoven when excessive heat may alter the character of the aggregate, or where more precise measurement is required. If a sourceof heat other than the controlled temperature oven is used, stir the sample during drying to accelerate the operation and avoidlocalized overh
26、eating. When using a microwave oven, stirring of the sample is optional.7.2.1 CautionWhen using a microwave oven, occasionally minerals are present in aggregates that may cause the material tooverheat and explode. If this occurs it can damage the microwave oven.7.3 When a hot plate is used, drying c
27、an be expedited by the following procedure. Add sufficient anhydrous denatured alcoholto cover the moist sample. Stir and allow suspended material to settle. Decant as much of the alcohol as possible without losingany of the sample. Ignite the remaining alcohol and allow it to burn off during drying
28、 over the hot plate.7.3.1 WarningExercise care to control the ignition operation to prevent injury or damage from the burning alcohol.7.4 The sample is thoroughly dry when further heating causes, or would cause, less than 0.1 % additional loss in mass.7.5 Determine the mass of the dried sample to th
29、e nearest 0.1 % after it has cooled sufficiently not to damage the balance.8. Calculation8.1 Calculate total evaporable moisture content as follows:p 5100 W 2D!/D (1)where:p = total evaporable moisture content of sample, percent,W = mass of original sample, g, andD = mass of dried sample, g.8.2 Surf
30、ace moisture content is equal to the difference between the total evaporable moisture content and the absorption, withall values based on the mass of a dry sample.Absorption may be determined in accordance with Test Method C127 or Test MethodC128.9. Precision and Bias9.1 Precision:9.1.1 The within-l
31、aboratory single operator standard deviation for moisture content of aggregates has been found to be 0.28 %(Note 23). Therefore, results of two properly conducted tests by the same operator in the same laboratory on the same type ofaggregate sample should not differ by more than 0.79 % (Note 23) fro
32、m each other.9.1.2 The between-laboratory standard deviation for moisture content of aggregates has been found to be 0.28 % (Note 23).Therefore, results of properly conducted tests from two laboratories on the same aggregate sample should not differ by more than0.79 % (Note 23) from each other.9.1.3
33、 Test data used to derive the above precision indices were obtained from samples dried to a constant mass in a drying ovenmaintained at 110 6 5C. When other drying procedures are used, the precision of the results may be significantly different thanthat indicated above.NOTE 3These numbers represent,
34、 respectively, the 1s and 2s limits as described in Practice C670.9.2 Bias:9.2.1 When experimental results are compared with known values from accurately compounded specimens, the following hasbeen derived.9.2.1.1 The bias of moisture tests on one aggregate material has been found to have a mean of
35、+0.06 %. The bias of individualtest values from the same aggregate material has been found with 95 % confidence to lie between 0.07 % and +0.20 %.9.2.1.2 The bias of moisture tests on a second aggregate material has been found to have a mean of +0.01 %. The bias ofindividual test values from the sam
36、e aggregate material has been found with 95 % confidence to lie between 0.14 % and +0.14 %.9.2.1.3 The bias of moisture tests overall on both aggregate materials has been found to have a mean of +0.03 %. The bias ofindividual test values overall from both aggregate materials has been found with 95 %
37、 confidence to lie between 0.12 %and +0.18 %.9.2.2 Test data used to derive the above bias statements were obtained from samples dried to a constant mass in a drying ovenmaintained at 110 6 5C. When other drying procedures are used, the bias of the results may be significantly different than thatind
38、icated above.NOTE 4These precision and bias statements were derived from aggregate moisture data provided by 17 laboratories participating in the SHRP SoilMoisture Proficiency Sample Program which is fully described in the National Research Council Report SHRP-P-619. The samples tested which relatet
39、o these statements were well-graded mixtures of fine and coarse aggregate with moisture contents ranging from air dry to saturated surface dry.C566 13310. Keywords10.1 aggregate; drying; moisture contentASTM International takes no position respecting the validity of any patent rights asserted in con
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