ASTM C91 C91M-2012 Standard Specification for Masonry Cement《砌筑水泥标准规格》.pdf

1、Designation:C9105 Designation: C91/C91M 12Standard Specification forMasonry Cement1This standard is issued under the fixed designation C91/C91M; 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

2、 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 specification covers three types of masonry cement for use

3、 where mortar for masonry is required.1.2The values stated in SI units are to be regarded as the standard. Values in SI units shall be obtained by measurement in SIunits or by appropriate conversion of measurements made in other units, using the Rules for Conversion and Rounding given in1.2 UnitsThe

4、 values stated in either SI units or inch-pound units are to be regarded separately as standard. The values statedin each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining valuesfrom the two systems may result in non-conformance with the

5、standard. Values in SI units shall be obtained by measurement inSI units or by appropriate conversion, using the Rules for Conversion and Rounding given in Standard IEEE/ASTM SI 10. , ofmeasurements made in other units. Values are stated in only SI units when inch-pound units are not used in practic

6、e.1.3 The text of this standard refers to notes and footnotes which provide explanatory material. These notes and footnotes(excluding those in tables and figures) shall not be considered as requirements of the standard.1.4 The following safety hazards caveat pertains only to Sections 16 and 17 of th

7、is specification. This standard does not purportto address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establishappropriate safety and health practices and determine the applicability of regulatory limitations prior to use. (W

8、arningFreshhydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure.)22. Referenced Documents2.1 ASTM Standards:3C109/C109M Test Method for Compressive Strength of Hydraulic Cement Mortars (Using 2-in. or 50-mm Cube Specimens)C151 Test Metho

9、d for Autoclave Expansion of Hydraulic CementC183 Practice for Sampling and the Amount of Testing of Hydraulic CementC185 Test Method for Air Content of Hydraulic Cement MortarC187 Test Method for Amount of Water Required for Normal Consistency of Hydraulic Cement PasteC188 Test Method for Density o

10、f Hydraulic CementC219 Terminology Relating to Hydraulic CementC266 Test Method for Time of Setting of Hydraulic-Cement Paste by Gillmore NeedlesC270 Specification for Mortar for Unit MasonryC305 Practice for Mechanical Mixing of Hydraulic Cement Pastes and Mortars of Plastic ConsistencyC430 Test Me

11、thod for Fineness of Hydraulic Cement by the 45-m (No. 325) SieveC511 Specification for Mixing Rooms, Moist Cabinets, Moist Rooms, and Water Storage Tanks Used in the Testing ofHydraulic Cements and ConcretesC778 Specification for SandC1506 Test Method for Water Retention of Hydraulic Cement-Based M

12、ortars and PlastersIEEE/ASTM SI 10 Standard for Use of the International System of Units (SI): The Modern Metric System3. Terminology3.1 Definitions:3.1.1 masonry cementa hydraulic cement, primarily used in masonry and plastering construction, consisting of a mixture of1This specification is under t

13、he jurisdiction of ASTM Committee C01 on Cement and is the direct responsibility of Subcommittee C01.11 on Masonry Cement.Current edition approved Sept. 15, 2005. Published October 2005. Originally approved in 1932. Last previous edition approved in 2003 as C9103a. DOI:10.1520/C0091-05.Current editi

14、on approved April 1, 2012. Published May 2012. Originally approved in 1932. Last previous edition approved in 2005 as C91 05. DOI: 10.1520/C0091-12.2Annual Book of ASTM Standards, Vol 04.01. See the section on Safety Precautions in the Manual of Cement Testing.3For referenced ASTM standards, visit t

15、he ASTM website, www.astm.org, or contact ASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.1This document is not an ASTM standard and is intended only to provide the user of an ASTM standar

16、d an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately 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 i

17、s to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.portland or blended hydraulic cement and plasticizing materials (such as limestone, hydrated or hydraulic lime) together with othermaterials intr

18、oduced to enhance one or more properties such as setting time, workability, water retention, and durability.3.1.2 Other terms used in this specification are defined in Terminology C219.4. Classification4.1 Type NFor use in preparation of Specification C270 Type N mortar without further addition of c

19、ements or hydrated lime,and for use in preparation of Specification C270 Type S or Type M mortar when cement is added in accordance with therequirements of C270.4.2 Type SFor use in preparation of Specification C270 Type S mortar without further addition of cements or hydrated lime.4.3 Type MFor use

20、 in preparation of Specification C270 Type M mortar without further addition of cements or hydrated lime.5. Physical Properties5.1 Masonry cement shall conform to the applicable requirements prescribed in Table 1 for its classification.6. Sampling6.1 The masonry cement shall be sampled in accordance

21、 with Practice C183.7. Temperature and Humidity7.1 The temperature and relative humidity of the air in the vicinity of the mixing slab and dry materials, molds, base plates, andmixing bowl shall conform to the requirements of Test Method C109/C109M.7.2 The moist cabinet or moist room shall conform t

22、o the requirements of Specification C511.8. Fineness8.1 Determine the residue on the 45-m (No. 325) sieve in accordance with Test Method C430.9. Normal Consistency9.1 Determine normal consistency by the Vicat apparatus in accordance with Test Method C187.10. Autoclave Expansion10.1 Determine autocla

23、ve expansion in accordance with Test Method C151. After molding, store the bars in the moist cabinetor room for 48 h 6 30 min before removal from the molds for measurement and testing in the autoclave. Calculate the differencein length of the test specimen before and after autoclaving to the nearest

24、 0.01 % of the effective gauge length and report as theautoclave expansion of the masonry cement.11. Time of Setting11.1 Determine the time of setting by the Gillmore needle method in accordance with Test Method C266.12. Density12.1 Determine the density of the masonry cement in accordance with Test

25、 Method C188, using kerosine as the liquid. Use thedensity so determined in the calculation of the air content of the mortars.TABLE 1 Physical RequirementsMasonry Cement Type N S MFineness, residue on a 45-m (No. 325) sieve, max, % 24 24 24Autoclave expansion, max, % 1.0 1.0 1.0Time of setting, Gill

26、more method:Initial set, minutes, not less than 120 90 90Initial set, minutes, not more than 1000 1000 1000Compressive strength (average of 3 cubes):The compressive strength of mortar cubes, composed of 1part cement and 3 parts blended sand (half graded standardsand, and half standard 2030 sand) by

27、volume, prepared andtested in accordance with this specification shall be equal to orhigher than the values specified for the ages indicated below:7 days, MPa (psi) 3.4 (500) 9.0 (1300) 12.4 (1800)7 days, MPa (psi) 3.4 500 9.0 1300 12.4 180028 days, MPa (psi) 6.2 (900) 14.5 (2100) 20.0 (2900)28 days

28、, MPa (psi) 6.2 900 14.5 2100 20.0 2900Air content of mortar, prepared and tested in accordance withrequirements of this specification:Min, volume % 88 8Max, volume % 21 19 19Water retention value, min, % of original flow 70 70 70C91/C91M 12213. Blended Sand13.1 The sand shall be a blend of equal pa

29、rts by weight of graded standard sand and standard 2030 sand conforming toSpecification C778.14. Preparation of Mortar14.1 Proportions for MortarMortar for air entrainment, compressive strength, and water retention tests shall be proportionedto contain 1620 g of sand and a mass of cement, in grams,

30、in accordance with Table 2. The sand shall consist of 810 g of gradedstandard sand and 810 g of 2030 standard sand (Note 1).sand. The quantity of water, measured in millilitres shall be such as toproduce a flow of 110 6 5 as determined by Test Method C109/C109M.NOTE1Historically, field-mixed mortar

31、has been proportioned by volume measured in increments or fractions of ft3. The comparable whole SI-unitvolume to 1 ft3is 28 L. The specified mortar proportions approximate the 1:3 nominal proportions by volume, commonly specified for construction, onthe basis of the following assumed mass and volum

32、e relationships: The mass of dry sand in 28 L of loose damp sand is 36 kg. 28 L Type N masonrycement has a mass of 32 kg. 28 L Type S masonry cement has a mass of 34 kg. 28 L Type M masonry cement has a mass of 36 kg.For example, the amount of cement needed to provide a 1:3 volume proportion of ceme

33、nt to sand using a Type N masonrycement is as follows:A516203C/B!51620332/108!5480C0091-05_1 (1)where:A = number of grams of cement to be used in the mortar with 1620 g of sand,B = 3 3 36 = 108 kg, the mass of dry sand in 84 (or 3 3 28) L of loose damp sand, andC = mass of Type N masonry cement per

34、28 L.14.2 Mixing of MortarsMix the mortar in accordance with Practice C305.15. Air Entrainment15.1 ProcedureIf the mortar has the correct flow, use a separate portion of the mortar for the determination of entrained air.Determine the mass of 400 mL of mortar in accordance with Test Method C185.15.2

35、CalculationCalculate the air content of the mortar and report it to the nearest 1 % as follows:D 5 W11 W21 Vw!/W1/S1! 1 W2/S2! 1 Vw# (1)C0091_C0091M-12_1C0091_C0091M-12_1where:D = density of air-free mortar, g/cm3,W1= mass of cement, g,W2= mass of sand, g,Vw= millilitres-grams of water used,S1= dens

36、ity of cement, g/cm3S2= density of standard sand, 2.65 g/cm3,A = volume percent of entrained air, andWm= mass of 400 mL of mortar, g.16. Compressive Strength16.1 Test Specimens:16.1.1 MoldingImmediately after determining the flow and mass of 400 mL of mortar, return all of the mortar to the mixingbo

37、wl and remix for 15 s at the medium speed. Then mold the test specimens in accordance with Test Method C109/C109M, exceptthat the elapsed time for mixing mortar, determining flow, determining air entrainment, and starting the molding of cubes shall bewithin 8 min.16.1.2 StorageImmediately after mold

38、ing, store all test specimens in the molds on plane plates in a moist cabinet or moistroom for 48 to 52 h in such a manner that the upper surfaces shall be exposed to the moist air. Then remove the cubes from themolds, and place them in the moist cabinet or moist room for 5 days in such a manner as

39、to allow free circulation of air aroundat least five faces of the specimens. At the age of 7 days, immerse the cubes for the 28-day tests in saturated lime water in storagetanks of noncorrodible materials.TABLE 2 Cement in Laboratory Batch of MortarMasonry Cement Type Mass of Cement, gN 480S 510M 54

40、0C91/C91M 12316.2 Procedure:16.2.1 Test the cube specimens immediately after their removal from the moist cabinet or moist room for 7-day specimens, andimmediately after their removal from storage water for all other specimens. If more than one specimen at a time is removed fromthe moist cabinet or

41、moist room for 7-day tests, cover these cubes with a damp cloth until the time of testing.16.2.2 The remainder of the testing procedure shall conform to Test Method C109/C109M.17. Water Retention17.1 Water retention shall be determined in accordance with the procedures in Test Method C1506.18. Stora

42、ge18.1 The cement shall be stored in such a manner as to permit easy access for the proper inspection and identification of eachshipment, and in a suitable weathertight building that will protect the cement from dampness and minimize warehouse set.19. Inspection19.1 Every facility shall be provided

43、to the purchaser for the necessary inspection and sampling.19.2 All packages shall be in good condition at the time of inspection.20. Rejection20.1 At the option of the purchaser, the cement shall be rejected if it fails to meet any of the requirements of this specification.20.2 At the option of the

44、 purchaser, packages more than 2 % below the mass marked thereon shall be rejected. At the optionof the purchaser, the entire shipment represented shall be rejected if the average mass of packages in any shipment as shown byweighing fifty packages taken at random is less than that marked on the pack

45、ages.20.3 At the option of the purchaser, cement remaining in storage prior to shipment for a period greater than six months aftertesting shall be retested and, at the option of the purchaser shall be rejected if it fails to meet any of the requirements of thisspecification.21. Manufacturers Certifi

46、cation21.1 Upon request of the purchaser in the contract or order, a manufacturers report shall be furnished at the time of shipmentstating the results of the tests made on samples of the material taken during production or transfer and certifying that the applicablerequirements of this specificatio

47、n have been met.22. Packaging and Package Marking22.1When masonry cement is delivered in packages, the brand, name of the manufacturer, type of masonry cement, and net massof the package in kilograms (see Note 2) shall be indicated plainly thereon. Similar information shall be provided in the shippi

48、ngdocuments accompanying the shipment of masonry cement in bulk.NOTE2To facilitate the change to SI units, a standard SI package size of 32 kg for Type N, 34 kg for Type S, and 36 kg for Type M will provideconvenient mass increments reasonably similar to the traditional 70-, 75-, and 80-lb packages.

49、22.1 When masonry cement is delivered in packages, the brand, name of the manufacturer, type of masonry cement, and netmass of the package in kilograms shall be indicated plainly thereon. Similar information shall be provided in the shippingdocuments accompanying the shipment of masonry cement in bulk.23. Keywords23.1 masonry; masonry cement; mortarASTM 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 t