ASTM C5-2003 Standard Specification for Quicklime for Structural Purposes《建筑用生石灰标准规范》.pdf

1、Designation:C503Standard Specification forQuicklime for Structural Purposes1This standard is issued under the fixed designation C 5; the number immediately following the designation indicates the year of originaladoption or, in the case of revision, the year of last revision. A number in parentheses

2、 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 Department of Defense.1. Scope1.1 This specification covers all classes of quicklime such ascrushed lime, gr

3、anular lime, ground lime, lump lime, pebblelime, and pulverized lime, used for structural purposes.2. Referenced Documents2.1 ASTM Standards:C 25 Test Methods for Chemical Analysis of Limestone,Quicklime, and Hydrated Lime2C 50 Practice for Sampling, Inspection, Packing, and Mark-ing of Lime and Lim

4、estone Products2C 51 Terminology Relating to Lime and Limestone (AsUsed by the Industry)2C 110 Test Methods for Physical Testing of Quicklime,Hydrated Lime, and Limestone2C 1489 Specification of Lime Putty for Structural Purposes2E 11 Specification for Wire-Cloth Sieves for Testing Pur-poses33. Term

5、inology3.1 DefinitionsUnless otherwise specified, for definitionsof terms used in this standard, refer to Terminology C 51.4. Chemical Composition4.1 The quicklime shall conform to the following require-ments as to chemical composition, calculated on a nonvolatilebasis:Calcium Lime Magnesium LimeCal

6、cium oxide, min, % 75Magnesium oxide, min, % 20Calcium and magnesium oxide,min, %95 95Silica, alumina, and oxide of iron,max, %55Carbon dioxide, max, %:If sample is taken at place ofmanufacture33If sample is taken at any otherplace10 105. Residue5.1 The quicklime shall contain no more than 15 weight

7、 %of residue.6. General Requirements6.1 Quicklime shall be slaked and aged in accordance withthe printed directions of the manufacturer. The resulting limeputty shall be stored until cool.6.2 Lime putty prepared in accordance with AppendixX1.4.2 must conform to the requirements of SpecificationC 148

8、9.7. Sampling, Inspection, etc.7.1 The sampling, inspection, rejection, retesting, packag-ing, and marking shall be conducted in accordance withMethods C 50.8. Test Methods8.1 Conformance to chemical requirements shall be deter-mined in accordance with Test Methods C 25.8.2 Conformance to plasticity

9、 and residue requirementsshall be determined in accordance with Test Methods C 110.9. Keywords9.1 building (structural); calcium oxide; dolomitic lime;high calcium lime; lime putty; magnesium oxide; plasticity;quicklime; residue; slaking1This specification is under the jurisdiction of ASTM Committee

10、 C07 on Limeand is the direct responsibility of Subcommittee C07.02 on Structural Lime.Current edition approved May 10, 2003. Published July 2003. Originallyapproved in 1913. Last previous edition approved in 1997 as C579(1997).2Annual Book of ASTM Standards, Vol 04.01.3Annual Book of ASTM Standards

11、, Vol 14.02.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.APPENDIX(Nonmandatory Information)X1. SLAKING AND PREPARATION OF LIME PUTTYX1.1 IntroductionX1.1.1 Quicklime can never be used as such for structuralpurposes; it must always

12、 be slaked first. Since the method ofslaking is an important factor in determining the quality of thefinished product, the following directions for the preparation oflime putty are given, not as a part of the specification, but asinformation for the further protection of the purchaser.X1.1.2 Differe

13、nt kinds of lime vary considerably in the wayin which they behave with water. A little supervision over theoperation of slaking will amply pay for itself by ensuring theproduction of the greatest possible quantity and the bestpossible quality of putty. To find out how to slake a new lot oflime, it i

14、s safest to try a little of it and see how it works. Sincedifferent lots of the same brand of lime vary somewhat, andsince the weather conditions at the time have a decidedinfluence, it is wise to try a sample from each lot used, whetherfamiliar with the brand or not.X1.2 Classification of LimesX1.2

15、.1 In a bucket, put two or three lumps of lime about thesize of ones fist, or, in the case of granular lime, an equivalentamount. Add sufficient water to just barely cover the lime, andnote how long it takes for slaking to begin. Slaking has begunwhen pieces split off from the lumps or when the lump

16、scrumble. Water of the same temperature should be used for testand field practice.X1.2.2 If slaking begins in less than 5 min, the lime is quickslaking; from 5 to 30 min, medium slaking; over 30 min, slowslaking.X1.3 Directions for SlakingX1.3.1 Slake quicklime in accordance with the printeddirectio

17、ns of the manufacturer. When such directions are notprovided, proceed as follows:X1.3.2 For quick-slaking lime, always add the lime to thewater, not the water to the lime. Have sufficient water at first tocover all the lime completely. Have a plentiful supply of wateravailable for immediate usea hos

18、e throwing a good stream,if possible. Watch the lime constantly. At the slightest appear-ance of escaping steam, hoe thoroughly and quickly, and addenough water to stop the steaming. Do not be afraid of usingtoo much water with this kind of lime.X1.3.3 For mediumslaking lime, add the water to the li

19、me.Add enough water so that the lime is about half submerged.Hoe occasionally if steam starts to escape. Add a little waternow and then if necessary to prevent the putty from becomingdry and crumbly. Be careful not to add any more water thanrequired, and not too much at a time.X1.3.4 For slowslaking

20、 lime, add enough water to the limeto moisten it thoroughly. Let it stand until the reaction hasstarted. Cautiously add more water, a little at a time, takingcare that the mass is not cooled by the fresh water. Do not hoeuntil the slaking is practically complete. If the weather is verycold, it is pr

21、eferable to use hot water, but if this is not available,the mortar box may be covered in some way to retain the heat.X1.4 Preparation of Putty for UseX1.4.1 After slaking, prepare putty for use as follows:X1.4.2 White CoatAfter slaking and aging finishingquicklime in accordance with the printed dire

22、ctions of themanufacturer, store the putty until cool. If no printed directionsare provided by the manufacturer, prepare the putty for use asfollows: After the action has ceased, run off the putty througha No. 10 (2.00-mm) sieve conforming to Specification E 11,and store for a minimum of 2 weeks.X1.

23、4.3 Base CoatsAfter the action has ceased, run off theputty through a No. 8 (2.36-mm) sieve conforming to Speci-fication E 11. Add sand up to equal parts by weight, all of thehair or other fibers required, and store for a minimum of 2weeks.X1.4.4 Masons MortarAfter the action has ceased, addpart or

24、all of the sand required, and store for a minimum of 24h.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 paten

25、t rights, and the 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 eithe

26、r for revision of 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 he

27、aring you shouldmake 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 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).C5032