1、Designation:C91/C91M12Standard 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 parentheses indicates t
2、he 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 cementfor use where mortar for masonry is
3、required.1.2 UnitsThe values stated in either SI units or inch-pound units are to be regarded separately as standard.Thevalues stated in each system may not be exact equivalents;therefore,each system shall be used independently of the other.Combining values from the two systems may result in non-con
4、formance with the standard.Values in SI units shall beobtained by measurement in SI units or by appropriateconversion,using the Rules for Conversion and Roundinggiven in Standard IEEE/ASTM SI 10,of measurements madein other units.Values are stated in only SI units wheninch-pound units are not used i
5、n practice.1.3 The text of this standard refers to notes and footnoteswhich provide explanatory material.These notes and footnotes(excluding those in tables and figures)shall not be consideredas requirements of the standard.1.4 The following safety hazards caveat pertains only toSections 16 and 17 o
6、f this specification.This standard does notpurport to address all of the safety concerns,if any,associatedwith its use.It is the responsibility of the user of this standardto establish appropriate safety and health practices anddetermine the applicability of regulatory limitations prior touse.(Warni
7、ngFresh hydraulic cementitious mixtures arecaustic and may cause chemical burns to skin and tissue uponprolonged exposure.)22.Referenced Documents2.1 ASTM Standards:3C109/C109M Test Method for Compressive Strength ofHydraulic Cement Mortars(Using 2-in.or 50-mm CubeSpecimens)C151 Test Method for Auto
8、clave Expansion of HydraulicCementC183 Practice for Sampling and the Amount of Testing ofHydraulic CementC185 Test Method for Air Content of Hydraulic CementMortarC187 Test Method for Amount of Water Required for Nor-mal Consistency of Hydraulic Cement PasteC188 Test Method for Density of Hydraulic
9、CementC219 Terminology Relating to Hydraulic CementC266 Test Method for Time of Setting of Hydraulic-CementPaste by Gillmore NeedlesC270 Specification for Mortar for Unit MasonryC305 Practice for Mechanical Mixing of Hydraulic CementPastes and Mortars of Plastic ConsistencyC430 Test Method for Finen
10、ess of Hydraulic Cement by the45-m(No.325)SieveC511 Specification for Mixing Rooms,Moist Cabinets,Moist Rooms,and Water Storage Tanks Used in theTesting of Hydraulic Cements and ConcretesC778 Specification for SandC1506 Test Method for Water Retention of HydraulicCement-Based Mortars and PlastersIEE
11、E/ASTM SI 10 Standard for Use of the InternationalSystem of Units(SI):The Modern Metric System3.Terminology3.1 Definitions:3.1.1 masonry cementa hydraulic cement,primarily usedin masonry and plastering construction,consisting of a mixtureof portland or blended hydraulic cement and plasticizingmateri
12、als(such as limestone,hydrated or hydraulic lime)1This specification is under the jurisdiction of ASTM Committee C01 onCement and is the direct responsibility of Subcommittee C01.11 on MasonryCement.Current edition approved April 1,2012.Published May 2012.Originallyapproved in 1932.Last previous edi
13、tion approved in 2005 as C91 05.DOI:10.1520/C0091-12.2Annual Book of ASTM Standards,Vol 04.01.See the section on SafetyPrecautions in the Manual of Cement Testing.3For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of
14、ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 together with other materials introduced to enhance one ormore properties such as setting tim
15、e,workability,waterretention,and durability.3.1.2 Other terms used in this specification are defined inTerminology C219.4.Classification4.1 Type NFor use in preparation of Specification C270Type N mortar without further addition of cements or hydratedlime,and for use in preparation of Specification
16、C270 Type Sor Type M mortar when cement is added in accordance with therequirements of C270.4.2 Type SFor use in preparation of Specification C270Type S mortar without further addition of cements or hydratedlime.4.3 Type MFor use in preparation of Specification C270Type M mortar without further addition of cements or hydratedlime.5.Physical Properties5.1 Masonry cement shall conform to the applicable re-quirements prescribed in Table 1 for its classification.6.Sampling6.1 The masonry cement shal
