1、Designation: C270 12aC270 14Standard Specification forMortar for Unit Masonry1This standard is issued under the fixed designation C270; 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 parenthe
2、ses 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 U.S. Department of Defense.1. Scope*Scope1.1 This specification covers mortars for use in the construction
3、 of non-reinforced and reinforced unit masonry structures. Fourtypes of mortar are covered in each of two alternative specifications: (1) proportion specifications and (2) property specifications.NOTE 1When the property specification is used to qualify masonry mortars, the testing agency performing
4、the test methods should be evaluated inaccordance with Practice C1093.1.2 The proportion or property specifications shall govern as specified.1.3 When neither proportion or property specifications are specified, the proportion specifications shall govern, unless data arepresented to and accepted by
5、the specifier to show that mortar meets the requirements of the property specifications.1.4 This standard is not a specification to determine mortar strengths through field testing (see Section 3).1.5 The text of this specification references notes and footnotes which provide explanatory material. T
6、hese notes and footnotes(excluding those in tables and figures) shall not be considered as requirements of the standard.1.6 The terms used in this specification are identified in Terminologies C1180 and C1232.1.7 The values stated in inch-pound units are to be regarded as standard. The values given
7、in parentheses are mathematicalconversions to SI units that are provided for information only and are not considered standard.1.8 The following safety hazards caveat pertains only to the test methods section of this specification:This standard does notpurport to address all of the safety concerns, i
8、f any, associated with its use. It is the responsibility of the user of this standard toestablish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C5 Specification for Quicklime for Structural Pu
9、rposesC91 Specification for Masonry CementC109/C109M Test Method for Compressive Strength of Hydraulic Cement Mortars (Using 2-in. or 50-mm Cube Specimens)C110 Test Methods for Physical Testing of Quicklime, Hydrated Lime, and LimestoneC128 Test Method for Density, Relative Density (Specific Gravity
10、), and Absorption of Fine AggregateC144 Specification for Aggregate for Masonry MortarC150 Specification for Portland CementC188 Test Method for Density of Hydraulic CementC207 Specification for Hydrated Lime for Masonry PurposesC305 Practice for Mechanical Mixing of Hydraulic Cement Pastes and Mort
11、ars of Plastic ConsistencyC511 Specification for Mixing Rooms, Moist Cabinets, Moist Rooms, and Water Storage Tanks Used in the Testing of HydraulicCements and ConcretesC595 Specification for Blended Hydraulic CementsC780 Test Method for Preconstruction and Construction Evaluation of Mortars for Pla
12、in and Reinforced Unit Masonry1 This specification is under the jurisdiction of ASTM Committee C12 on Mortars and Grouts for Unit Masonryand is the direct responsibility of Subcommittee C12.03on Specifications for Mortars.Current edition approved June 1, 2012June 1, 2014. Published July 2012July 201
13、4. Originally approved in 1951. Last previous edition approved in 2012 asC270 12.C270 12a. DOI: 10.1520/C0270-12A.10.1520/C0270-14.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume informat
14、ion, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depic
15、t 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 is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM Internationa
16、l, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1C952 Test Method for Bond Strength of Mortar to Masonry UnitsC979 Specification for Pigments for Integrally Colored ConcreteC1072 Test Methods for Measurement of Masonry Flexural Bond StrengthC1093 Practice for Ac
17、creditation of Testing Agencies for MasonryC1157 Performance Specification for Hydraulic CementC1180 Terminology of Mortar and Grout for Unit MasonryC1232 Terminology of MasonryC1324 Test Method for Examination and Analysis of Hardened Masonry MortarC1329 Specification for Mortar CementC1384 Specifi
18、cation for Admixtures for Masonry MortarsC1489 Specification for Lime Putty for Structural PurposesC1506 Test Method for Water Retention of Hydraulic Cement-Based Mortars and PlastersC1586 Guide for Quality Assurance of MortarsE72 Test Methods of Conducting Strength Tests of Panels for Building Cons
19、tructionE514 Test Method for Water Penetration and Leakage Through MasonryE518 Test Methods for Flexural Bond Strength of Masonry2.2 Masonry Industry Council:3Hot and Cold Weather Masonry Construction Manual, January 19993. Specification Limitations3.1 Specification C270 is not a specification to de
20、termine mortar strengths through field testing.3.1 Laboratory testing of mortar to ensure compliance with the property specification requirements of this specification shall beperformed in accordance with 5.3. The property specification of this standard applies to mortar mixed to a specific flow in
21、thelaboratory.3.2 The compressive strength values resulting from field tested mortars do not represent the compressive strength of mortar astested in the laboratory nor that of the mortar in the wall. Physical properties of field sampled mortar shall not be used to determinecompliance to this specif
22、ication and are not intended as criteria to determine the acceptance or rejection of the mortar (see Section8).4. Materials4.1 Materials used as ingredients in the mortar shall conform to the requirements specified in 4.1.1 to 4.1.4.4.1.1 Cementitious MaterialsCementitious materials shall conform to
23、 the following ASTM specifications:4.1.1.1 Portland CementTypes I, IA, II, IIA, III, IIIA, or V of Specification C150.4.1.1.2 Blended Hydraulic CementsTypes IS(70), IS(70)-A, IP, IP-A of Specification C595.4.1.1.3 Hydraulic CementsTypes GU, HE, MS, and HS of Specification C1157 (Types MH and LH are
24、limited to use in theproperty specifications only).4.1.1.4 Portland Blast-Furnace Slag Cement (for Use in Property Specifications Only)Types IS(70) or IS(70)-A ofSpecification C595.4.1.1.5 Masonry CementSee Specification C91.4.1.1.6 Mortar CementSee Specification C1329.4.1.1.7 QuicklimeSee Specifica
25、tion C5.4.1.1.8 Hydrated LimeSpecification C207, Types S or SA. Types N or NAlimes are permitted if shown by test or performancerecord to be not detrimental to the soundness of the mortar.4.1.1.9 Lime PuttySee Specification C1489.4.1.2 AggregatesSee Specification C144.4.1.3 WaterWater shall be clean
26、 and free of amounts of oils, acids, alkalies, salts, organic materials, or other substances thatare deleterious to mortar or any metal in the wall.4.1.4 AdmixturesAdmixtures shall not be added to mortar unless specified. Admixtures shall not add more than 65 ppm(0.0065 %) water soluble chloride or
27、90 ppm (0.0090 %) acid soluble chloride to the mortars overall chloride content, unlessexplicitly provided for in the contract documents.4.1.4.1 Classified AdmixturesAdmixtures which are classified as bond enhancers, workability enhancers, set accelerators, setretarders, and water repellents shall b
28、e in accordance with Specification C1384.4.1.4.2 Color PigmentsColoring pigments shall be in accordance with Specification C979.4.1.4.3 Unclassified AdmixturesMortars containing admixtures outside the scopes of Specifications C1384 and C979 shall bein accordance with the property requirements of thi
29、s specification and the admixture shall be shown to be non-deleterious to themortar, embedded metals, and the masonry units.3 Available from the Mason Contractors Association of America, 1910 South Highland Avenue, Suite 101, Lombard, IL 60148.C270 1424.1.4.4 Calcium ChlorideWhen explicitly provided
30、 for in the contract documents, calcium chloride is permitted to be usedas an accelerator in amounts not to exceed 2 % by weight of the portland cement content or 1 % of the masonry cement content,or both, of the mortar.NOTE 2If calcium chloride is allowed, it should be used with caution as it may h
31、ave a detrimental effect on metals and on some wall finishes.5. Requirements5.1 Unless otherwise stated, a cement/lime mortar, a mortar cement mortar, or a masonry cement mortar is permitted. A mortartype of known higher strength shall not be indiscriminately substituted where a mortar type of antic
32、ipated lower strength isspecified.5.2 Proportion SpecificationsMortar conforming to the proportion specifications shall consist of a mixture of cementitiousmaterial, aggregate, and water, all conforming to the requirements of Section 4 and the proportion specifications requirements ofTable 1. See Ap
33、pendix X1 or Appendix X3 for a guide for selecting masonry mortars.5.3 Property SpecificationsMortar conformance to the property specifications shall be established by tests of laboratoryprepared mortar in accordance with Section 6 and 7.2. The laboratory prepared mortar shall consist of a mixture o
34、f cementitiousmaterial, aggregate, and water, all conforming to the requirements of Section 4 and the properties of the laboratory prepared mortarshall conform to the requirements of Table 2. See Appendix X1 for a guide for selecting masonry mortars.5.3.1 No change shall be made in the laboratory es
35、tablished proportions for mortar accepted under the property specifications,except for the quantity of mixing water. Materials with different physical characteristics shall not be utilized in the mortar usedin the work unless compliance with the requirements of the property specifications is reestab
36、lished.NOTE 3The physical properties of plastic and hardened mortar complying with the proportion specification (5.1) may differ from the physicalproperties of mortar of the same type complying with the property specification (5.3). For example, laboratory prepared mortars batched to the proportions
37、listed in Table 1 will, in many cases, considerably exceed the compressive strength requirements of Table 2.NOTE 4The required properties of the mortar in Table 2 are for laboratory prepared mortar mixed with a quantity of water to produce a flow of 1106 5 %. This quantity of water is not sufficient
38、 to produce a mortar with a workable consistency suitable for laying masonry units in the field. Mortar foruse in the field must be mixed with the maximum amount of water, consistent with workability, in order to provide sufficient water to satisfy the initialrate of absorption (suction) of the maso
39、nry units. The properties of laboratory prepared mortar at a flow of 110 6 5, as required by this specification,are intended to approximate the flow and properties of field prepared mortar after it has been placed in use and the suction of the masonry units has beensatisfied. The properties of field
40、 prepared mortar mixed with the greater quantity of water, prior to being placed in contact with the masonry units, willdiffer from the property requirements in Table 2. Therefore, the property requirements in Table 2 cannot be used as requirements for quality control offield prepared mortar. Test M
41、ethod C780 may be used for this purpose.NOTE 5Air content of non-air-entrained portland cement-lime mortar is generally less than 8 %.TABLE 1 Proportion Specification RequirementsNOTE 1Two air-entraining materials shall not be combined in mortar.Proportions by Volume (Cementitious Materials)Mortar T
42、ype CementAMortar Cement Masonry Cement Hydrated Limeor Lime PuttyAggregate Ratio(Measured inDamp, Loose Con-ditions)M S N M S NCement-Lime M 1 . . . . . . . . . . . . . . . . . . 14S 1 . . . . . . . . . . . . . . . . . . over 14 to 12N 1 . . . . . . . . . . . . . . . . . . over 12 to 114O 1 . . . .
43、 . . . . . . . . . . . . . . over 114 to212Mortar Cement M 1 . . . . . . 1 . . . . . . . . . . . . Not less than 214and not more than3 times the sum ofthe separate vol-umes of cementi-tious materialsM . . . 1 . . . . . . . . . . . . . . . . . .S 12 . . . . . . 1 . . . . . . . . . . . .S . . . . . .
44、1 . . . . . . . . . . . . . . .N . . . . . . . . . 1 . . . . . . . . . . . .O . . . . . . . . . 1 . . . . . . . . . . . .Masonry Cement M 1 . . . . . . . . . . . . . . . 1 . . .M . . . . . . . . . . . . 1 . . . . . . . . .S 12 . . . . . . . . . . . . . . . 1 . . .S . . . . . . . . . . . . . . . 1 .
45、. . . . .N . . . . . . . . . . . . . . . . . . 1 . . .O . . . . . . . . . . . . . . . . . . 1 . . .A IncludesIncludes Specification C150, C595, and C1157 cements as described in 4.1.1.C270 1436. Test Methods6.1 Proportions of Materials for Test SpecimensLaboratory mixed mortar used for determining c
46、onformance to this propertyspecification shall contain construction materials in proportions indicated in project specifications. Measure materials by weightfor laboratory mixed batches. Convert proportions, by volume, to proportions, by weight, using a batch factor calculated as follows:Batch facto
47、r51440/80 times total sand volume proportion! (1)Determine weight of material as follows:Mat. Weight5Mat.Volume Proportion3Bulk Density3Batch Factor (2)NOTE 6See Appendix X4 for examples of material proportioning.6.1.1 When converting volume proportions to batch weights, use the following material b
48、ulk densities:Material Bulk DensityPortland Cement Obtain from bag or supplierBlended Cement Obtain from bag or supplierHydraulic Cement Obtain from bag or supplierSlag Cement Obtain from bag or supplierMasonry Cement Obtain from bag or supplierMortar Cement Obtain from bag or supplierLime Putty 80
49、pcf (1280 kg/m3)Hydrated Lime 40 pcf (640 kg/m3)Sand 80 pcf (1280 kg/m3)NOTE 7All quicklime should be slaked in accordance with the manufacturers directions. All quicklime putty, except pulverized quicklime putty,should be sieved through a No. 20 (850 m) sieve and allowed to cool until it has reached a temperature of 80F (26.7C). Quicklime putty should weighat least 80 pcf (1280 kg/m3). Putty that weighs less than this may be used in the proportion specifications, if the required quantity of extra putty is addedto meet the minim
