ASTM C821-2014 Standard Specification for Lime for Use with Pozzolans《与火山灰掺和用石灰的标准规格》.pdf

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1、Designation: C821 14Standard Specification forLime for Use with Pozzolans1This standard is issued under the fixed designation C821; 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 parentheses

2、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 q

3、uick 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 not

4、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 Standards:

5、2C25 Test Methods for Chemical Analysis of Limestone,Quicklime, and Hydrated LimeC50 Practice for Sampling, Sample Preparation, Packaging,and Marking of Lime and Limestone ProductsC51 Terminology Relating to Lime and Limestone (as usedby the Industry)C204 Test Methods for Fineness of Hydraulic Cemen

6、t byAir-Permeability ApparatusC593 Specification for Fly Ash and Other Pozzolans for UseWith Lime for Soil StabilizationC1271 Test Method for X-ray Spectrometric Analysis ofLime and LimestoneC1301 Test Method for Major and Trace Elements in Lime-stone and Lime by Inductively Coupled Plasma-AtomicEmi

7、ssion Spectroscopy (ICP) and Atomic Absorption(AA)3. 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 chemical factor, na numerical value of the activeconstituents in the hydrated li

8、me 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, since these compounds have been found to benonreactive.3.2.2 pozzolanic receptiv

9、ity 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 Section 5.5. Performance Requirements5.1 If the chemical factor, Blaine finenes

10、s, 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, it shall be considered acceptable for usewith pozzolans. However, it may be

11、 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) and magnesium oxide(MgO) contents in accordance with Methods C25, C1271,orC1301. Determine the carbon dioxide (CO2) cont

12、ent in accor-dance with Method 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 magnesium oxide is

13、 lessthan 5 %, the value of r shall be 0.30.1This specification is under the jurisdiction of ASTM Committee C07 on Limeand Limestone and is the direct responsibility of Subcommittee C07.02 onSpecifications and Guidelines.Current edition approved July 1, 2014. Published July 2014. Originally approved

14、in 1975. Last previous edition approved in 2009 as C821 09. DOI: 10.1520/C0821-14.2For 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 Summary pag

15、e onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1r 5cps MgOcps MgO12.0 cps Mg OH!2!(1)where:cps = counts per second of principal peaks corresponding

16、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 6.1.1 the chemical factor (C.F.) is determinedby Eq 2:C.F. 5 CaO! 2 1.27 CO2!11.4 r MgO! (2)6.2 Blaine FinenessCalculate in accordance with MethodC204, except use

17、 the specific gravity 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 C204.Use the specific gravity of the lime and finally chosen weightto determine the porosity of the bed in accordance with Eq 2 ofTest Me

18、thod C204, and use this porosity (as well as specificgravity) in calculating the surface area.6.3 Pozzolanic Receptivity Index (PRI):PRI 5chemical factor 3Blaine fineness10 000(3)6.4 Lime-Pozzolan StrengthSee Specification C593, Sec-tion 7. The pozzolan used shall pass the requirements ofSpecificati

19、on C593 when tested with a lime having a pozzo-lanic receptivity index of 80 or higher.6.5 Lime-Pozzolan-Aggregate Strength, Freeze-ThawResistanceSee Specification C593, Section 8. The pozzolanused shall pass the requirements of Specification C593 whentested with a lime having a pozzolanic receptivi

20、ty index 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 selecte

21、d changes to this standard since the last issue (C219 09)that may impact the use of this standard. (Approved July 1, 2014.)(1) Added Test Methods C1271 and C1301 to ReferencedDocuments section.(2) Revised 6.1.1.ASTM International takes no position respecting the validity of any patent rights asserte

22、d 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 riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by th

23、e 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 this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive

24、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 shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM Internat

25、ional, 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 by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through t

26、he ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 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)C821 142