ASTM C40-2004 Standard Test Method for Organic Impurities in Fine Aggregates for Concrete《混凝土用细集料中有机杂质含量的标准试验方法》.pdf
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1、Designation: C 40 04American Association StateHighway and Transportation Officials StandardAASHTO No.: T 21Standard Test Method forOrganic Impurities in Fine Aggregates for Concrete1This standard is issued under the fixed designation C 40; the number immediately following the designation indicates t
2、he year of originaladoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscriptepsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the D
3、epartment of Defense.1. Scope1.1 This test method covers two procedures for an approxi-mate determination of the presence of injurious organic impu-rities in fine aggregates that are to be used in hydraulic cementmortar or concrete. One procedure uses a standard colorsolution and the other uses a gl
4、ass color standard.1.2 The values given in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standar
5、d 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 33 Specification for Concrete AggregatesC 87 Test Method for Effect of Organic Impurities in FineAggregate on Strength of Morta
6、rC 125 Terminology Relating to Concrete and ConcreteAggregatesC 702 Practice for Reducing Samples of Aggregate toTesting SizeD 75 Practice for Sampling AggregatesD 1544 Test Method for Color of Transparent Liquids(Gardner Color Scale)3. Significance and Use3.1 This test method is used in making a pr
7、eliminarydetermination of the acceptability of fine aggregates withrespect to the requirements of Specification C 33 that relate toorganic impurities.3.2 The principal value of this test method is to furnish awarning that injurious amounts of organic impurities may bepresent. When a sample subjected
8、 to this test produces a colordarker than the standard color it is advisable to perform the testfor the effect of organic impurities on the strength of mortar inaccordance with Test Method C 87.4. Apparatus4.1 Glass BottlesColorless glass graduated bottles, ap-proximately 240 to 470-mL (8 to 16-oz)
9、nominal capacity,equipped with watertight stoppers or caps, not soluble in thespecified reagents. In no case shall the maximum outsidethickness of the bottles, measured along the line of sight usedfor the color comparison, be greater than 63.5 mm (2.5 in.) orless than 38.1 mm (1.5 in.). The graduati
10、ons on the bottles shallbe in millilitres, or ounces (U.S. fluid), except that unmarkedbottles may be calibrated and scribed with graduations by theuser. In such case, graduation marks are required at only threepoints as follows:4.1.1 Standard Color Solution Level75 mL (212 oz (U.S.fluid),4.1.2 Fine
11、 Aggregate Level130 mL (412 oz (U.S. fluid),and4.1.3 NaOH Solution Level200 mL (7 oz (U.S. fluid).4.2 Glass Color Standard4.2.1 Glass standard colors shall be used as described inTable 1 of Test Method D 1544.NOTE 1A suitable instrument consists of five glass color standardsmounted in a plastic hold
12、er. Only the glass identified as Gardner ColorStandard No. 11 is to be used as the Glass Color Standard in 9.2.5. Reagent and Standard Color Solution5.1 Reagent Sodium Hydroxide Solution (3 %)Dissolve 3parts by mass of reagent grade sodium hydroxide (NaOH) in 97parts of water.5.2 Standard Color Solu
13、tionDissolve reagent grade po-tassium dichromate (K2Cr2O7) in concentrated sulfuric acid (spgr 1.84) at the rate of 0.250 g/100 mL of acid. The solutionmust be freshly made for the color comparison using gentleheat if necessary to effect solution.1This test method is under the jurisdiction of ASTM C
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