ASTM C821-2009 Standard Specification for Lime for Use with Pozzolans《与火山灰掺和用石灰的标准规范》.pdf

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1、Designation: C 821 09Standard Specification forLime for Use with Pozzolans1This standard is issued under the fixed designation C 821; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parenthese

2、s indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers all types of commercial hy-drated lime such as: high-calcium, magnesium, or dolomitic-hydrated lime. By-product limes and slaked

3、 quick limes in dry,wet, or slurried form are also included.1.2 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3 This standard does no

4、t purport to address all of thesafety concerns, 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 Standard

5、s:2C25 Test Methods for Chemical Analysis of Limestone,Quicklime, and Hydrated LimeC50 Practice for Sampling, Sample Preparation, Packag-ing, and Marking of Lime and Limestone ProductsC51 Terminology Relating to Lime and Limestone (as usedby the Industry)C 204 Test Methods for Fineness of Hydraulic

6、Cement byAir-Permeability ApparatusC 593 Specification for Fly Ash and Other Pozzolans forUse With Lime for Soil Stabilization3. Terminology3.1 Definitions:3.1.1 For definitions of terms used in this specification, referto Terminology C51.3.2 Definitions of Terms Specific to This Standard:3.2.1 chem

7、ical factor, na numerical value of the activeconstituents in the hydrated lime that react chemically with apozzolan. The value is based on the combined calcium oxideequivalents of free calcium oxide, calcium hydroxide, andmagnesium oxide. Calcium carbonate and magnesium hydrox-ide are excluded, sinc

8、e these compounds have been found to benonreactive.3.2.2 pozzolanic receptivity index, na performance factorincorporating both chemical quality and fineness, determinedby Eq 3.4. Chemical and Physical Requirements4.1 The lime shall conform to the requirements listed inTable 1, except as noted in Sec

9、tion 5.5. Performance Requirements5.1 If the chemical factor, Blaine fineness, or pozzolanicreceptivity index is below the limits given in Table 1, the limeshall be required to meet the applicable performance require-ments listed in Table 2. Where such lime complies with thelimits listed in Table 2,

10、 it shall be considered acceptable for usewith pozzolans. However, it may be necessary to increase thelime content in the lime-pozzolan mixtures in order to meetminimum design criteria.6. Test Methods6.1 Chemical Factor:6.1.1 Determine calcium oxide (CaO), magnesium oxide(MgO), and carbon dioxide (C

11、O2) contents in accordance withTest Methods C25. When the magnesium oxide content isgreater than 5 %, determine the peak height of magnesiumoxide and magnesium hydroxide using standard X-ray diffrac-tion procedures and calculate the ratio (r) of magnesium oxideto hydroxide using Eq 1. When the magne

12、sium oxide is lessthan 5 %, the value of r shall be 0.30.r 5cps MgOcps MgO 1 2.0 cps Mg OH!2!(1)where:cps = counts per second of principal peaks corresponding toan interplanar spacing for MgO of 2.106 and forMg(OH)2of 2.365 .6.1.2 Calculation of Chemical FactorUsing the test re-sults provided by 6.1

13、.1 the chemical factor (C.F.) is determinedby Eq 2:C.F. 5CaO!21.27 CO2!11.4 r MgO! (2)1This specification is under the jurisdiction of ASTM Committee C07 on Limeand is the direct responsibility of Subcommittee C07.02 on Specifications andGuidelines.Current edition approved June 1, 2009. Published Ju

14、ly 2009. Originally approvedin 1975. Last previous edition approved in 2000 as C 821 78(2000).2For referenced 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

15、 Summary page onthe ASTM website.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6.2 Blaine FinenessCalculate in accordance with MethodC 204, except use the specific g

16、ravity of the lime in calculatingthe trial weight of the sample, and the weight finally chosenmust result in a firm bed as described in Test Method C 204.Use the specific gravity of the lime and finally chosen weightto determine the porosity of the bed in accordance with Eq 2 ofTest Method C 204, an

17、d use this porosity (as well as specificgravity) in calculating the surface area.6.3 Pozzolanic Receptivity Index (PRI):PRI 5chemical factor 3 Blaine fineness10 000(3)6.4 Lime-Pozzolan StrengthSee Specification C 593, Sec-tion 7. The pozzolan used shall pass the requirements ofSpecification C 593 wh

18、en tested with a lime having a poz-zolanic receptivity index of 80 or higher.6.5 Lime-Pozzolan-Aggregate Strength, Freeze-ThawResistanceSee Specification C 593, Section 8. The pozzolanused shall pass the requirements of Specification C 593 whentested with a lime having a pozzolanic receptivity index

19、 of 80or higher.7. Sampling, Inspection, Packing, and Marking7.1 The sampling, inspection, rejection, retesting, packing,and marking shall be conducted in accordance with MethodsC50.8. Keywords8.1 hydrated; lime; pozzolansSUMMARY OF CHANGESCommittee C07 has identified the location of selected change

20、s to this specification since the last issue,C 821 78(2000), that may impact the use of this specification. (Approved June 1, 2009)(1) This specification was reinstated with revision. A unitsstatement was added in new 1.2 and subsequent paragraphswere renumbered. Reference to Terminology C51was adde

21、dto Section 3 and Referenced Documents.ASTM 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

22、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

23、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

24、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

25、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).TABLE 1 Chemical and Physical RequirementsChemical factor, min 50Blaine fineness, min, cm2/g 10 000Pozzolanic receptivity index, min 100TABLE 2 Performance RequirementsPlastic Compositions:Lime-pozzolan strength, min, psi (MPa) 600 (4.13)Nonplastic Compositions:Lime-pozzolan-aggregate strength, min, psi (MPa) 400 (2.76)Vacuum saturation strength, min, psi (MPa) 400 (2.8)C821092