1、Designation: C55 11Standard Specification forConcrete Building Brick1This standard is issued under the fixed designation C55; 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 indica
2、tes the year of last reapproval. A superscriptepsilon () 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. Scope*1.1 This specification covers solid, dry-cast, concrete build-ing brick intended for
3、interior and exterior use in constructingstructural masonry, and are made from portland cement, water,and suitable mineral aggregates with or without the inclusionof other materials.NOTE 1Specification C1634 addresses concrete facing brick used infacing applications and other exposures (previously r
4、eferred to in earliereditions of this standard as Grade Nfor use as architectural veneer andfacing units in exterior walls and for use where high-strength andresistance to moisture penetration and severe frost action are desired). Thisspecification differs from C1634 in that it addresses properties
5、for concretebuilding brick used in non-facing, utilitarian applications (previouslyreferred to in earlier editions of this specification as Grade Sfor generaluse where moderate strength and resistance to frost action and moisturepenetration are required).1.2 The text of this specification references
6、 notes andfootnotes which provide explanatory material. These notes andfootnotes (excluding those in tables and figures) shall not beconsidered as requirements of the standard.1.3 The values stated in inch-pound units are to be regardedas the standard. The values given in parentheses are forinformat
7、ion only.NOTE 2Concrete building brick covered by this specification aremade from lightweight or normal weight aggregates, or both.NOTE 3When particular features are desired, such as density classi-fication, high compressive strength, surface textures for appearance orbond, finish, color, fire resis
8、tance, insulation, acoustical properties, orother special features, such properties should be specified separately bythe purchaser. Suppliers should be consulted as to the availability ofconcrete building brick having the desired features.1.4 The values stated in inch-pound units are to be regardeda
9、s standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.2. Referenced Documents2.1 ASTM Standards:2C33 Specification for Concrete AggregatesC140 Test Methods for Sampling and Testing ConcreteMasonry Uni
10、ts and Related UnitsC150 Specification for Portland CementC331 Specification for Lightweight Aggregates for Con-crete Masonry UnitsC426 Test Method for Linear Drying Shrinkage of ConcreteMasonry UnitsC595 Specification for Blended Hydraulic CementsC618 Specification for Coal Fly Ash and Raw or Calci
11、nedNatural Pozzolan for Use in ConcreteC989 Specification for Slag Cement for Use in Concreteand MortarsC1157 Performance Specification for Hydraulic CementC1232 Terminology of MasonryC1634 Specification for Concrete Facing Brick3. Terminology3.1 Terminology defined in Terminology C1232 shall applyf
12、or this specification.3.2 Definitions of Terms Specific to This Standard:3.2.1 concrete building brick, na concrete masonry unit,with a maximum width of four (4) inches and of a weight thatwill typically permit it to be lifted and placed with one hand,that is manufactured for general use in non-faci
13、ng, utilitarianapplications.3.2.2 concrete facing brick, na concrete masonry unit,with a maximum width of four (4) inches and of a weight thatwill typically permit it to be lifted and placed with one hand,that is manufactured to be typically used in an applicationwhere one or more faces of the unit
14、is intended to be exposed.4. Materials and Manufacture4.1 Cementitious MaterialsMaterials shall conform to thefollowing applicable specifications:1This specification is under the jurisdiction of ASTM Committee C15 onManufactured Masonry Units and is the direct responsibility of SubcommitteeC15.03 on
15、 Concrete Masonry Units and Related Units.Current edition approved June 1, 2011. Published June 2011. Originallyapproved in 1924. Last previous edition approved in 2009 as C55 09. DOI:10.1520/C0055-11.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Servi
16、ce at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428
17、-2959, United States.4.1.1 Portland CementSpecification C150.4.1.2 Modified Portland CementPortland cement con-forming to Specification C150, modified as follows:4.1.2.1 LimestoneCalcium carbonate, with a minimum85 % CaCO3content, is permitted to be added to the cement,provided these requirements of
18、 Specification C150 as modifiedare met:(1) Limitation on Insoluble Residue1.5 %.(2) Limitation on Air Content of MortarVolume percent,22 % max.(3) Limitation on Loss on Ignition7%.4.1.3 Blended Hydraulic CementsSpecification C595.4.1.4 Hydraulic CementSpecification C1157.4.1.5 PozzolansSpecification
19、 C618.4.1.6 Blast Furnace Slag CementSpecification C989.4.2 AggregatesAggregates shall conform to the followingspecifications, except that grading requirements shall notnecessarily apply:4.2.1 Normal Weight AggregatesSpecification C33.4.2.2 Lightweight AggregatesSpecification C331.4.3 Other Constitu
20、entsAir-entraining agents, coloringpigments, integral water repellents, finely ground silica, andother constituents shall be previously established as suitable foruse in concrete masonry units and shall conform to applicableASTM standards or shall be shown by test or experience not tobe detrimental
21、to the durability of the concrete masonry unitsor any material customarily used in masonry construction.5. Physical Requirements5.1 At the time of delivery to the purchaser, units shallconform to the physical requirements prescribed in Table 1.5.1.1 When higher compressive strengths than those liste
22、din Table 1 are specified, the tested average net area compres-sive strength of three units shall equal or exceed the specifiedcompressive strength, and the following single unit strengthrequirements shall apply.5.1.1.1 When the specified compressive strength is less than5000 psi, no single unit net
23、 area compressive strength testresult shall be less than the specified compressive strengthminus 500 psi.5.1.1.2 When the specified compressive strength is 5000 psior greater, no single unit net area compressive strength testresult shall be less than 90 % of the specified compressivestrength.5.2 At
24、the time of delivery to the purchaser, the total lineardrying shrinkage of units shall not exceed 0.065 % when testedin accordance with Test Method C426.NOTE 4The purchaser is the public body or authority, association,corporation, partnership, or individual entering into a contract or agree-ment to
25、purchase or install, or both, concrete building brick. The time ofdelivery to the purchaser is FOB plant when the purchaser or thepurchasers agent transports the concrete building brick, or at the timeunloaded at the worksite if the manufacturer or the manufacturers agenttransports the concrete buil
26、ding brick.6. Dimensions and Permissible Variations6.1 No overall dimension (width, height, and length) shalldiffer by more than 618 in. (3.2 mm) from the specifiedstandard dimensions.NOTE 5Standard dimensions of concrete building brick are themanufacturers designated dimensions. Nominal dimensions
27、of modularsize concrete building brick are equal to the standard dimensions plus thethickness of one mortar joint. Nominal dimensions of nonmodular sizeconcrete building brick usually exceed the standard dimensions by18 to14in. (3.2 to 6.4 mm).6.2 CoringUnless otherwise specified, brick shall be ei-
28、ther solid or cored at the option of the seller. For cored concretebuilding brick, the net cross-sectional area in any plane parallelto the surface containing the cores shall be at least 75 % of thegross cross-sectional area measure in the same plane. No partof any hole shall be less than34 in. (19.
29、1 mm) from any edgeof the unit.7. Finish and Appearance7.1 All units shall be sound and free of cracks or otherdefects that interfere with the proper placement of the units orsignificantly impair the strength or permanence of the construc-tion. Minor cracks incidental to the usual method of manufac-
30、ture or minor chipping resulting from customary methods ofhandling in shipment and delivery are not grounds for rejec-tion.8. Methods of Sampling and Testing8.1 The purchaser or authorized representative shall beaccorded proper facilities to inspect and sample the concretebuilding brick at the place
31、 of manufacture from the lots readyfor delivery.8.2 Sample and test concrete building brick in accordancewith Test Methods C140 and Test Method C426, when appli-cable.8.3 Total linear drying shrinkage shall be based on tests ofconcrete building brick made with the same materials, concretemix design,
32、 manufacturing process, and curing method, con-ducted in accordance with Test Method C426 not more than 24months prior to delivery.9. Compliance9.1 If a sample fails to conform to the specified require-ments, the manufacturer shall be permitted to remove unitsfrom the shipment. A new sample shall be
33、 selected by theTABLE 1 Strength, Absorption, and Density Classification RequirementsADensityClassificationOven-Dry Densityof Concrete, lb/ft3(kg/m3)Maximum WaterAbsorption, lb/ft3(kg/m3)Minimum Net AreaCompressive Strength, lb/in2(MPa)Average of 3 Units Average of 3 Units Individual Units Average o
34、f 3 Units Individual UnitsLightweight Less than 105 (1680) 18 (288) 20 (320) 2500 (17.2) 2000 (13.8)Medium Weight 105 to less than 125 (16802000) 15 (240) 17 (272) 2500 (17.2) 2000 (13.8)Normal Weight 125 (2000) or more 13 (208) 15 (240) 2500 (17.2) 2000 (13.8)AAverage oven-dry density, based on a s
35、et of three units, shall fall within ranges defined in the table to be classified as lightweight, medium weight, or normal weight.C55112purchaser from remaining units from the shipment with asimilar configuration and dimension and tested at the expenseof the manufacturer. If the second sample meets
36、the specifiedrequirements, the remaining portion of the shipment repre-sented by the sample meets the specified requirements. If thesecond sample fails to meet the specified requirements, theremaining portion of the shipment represented by the samplefails to meet the specified requirements.NOTE 6Unl
37、ess otherwise specified in the purchase order, the costs oftests is typically borne as follows: (1) if the results of the tests show thatthe units do not conform to the requirements of this specification, the costis typically borne by the seller; (2) if the results of the tests show that theunits co
38、nform to the specification requirements, the cost is typically borneby the purchaser.10. Keywords10.1 absorption; compressive strength; concrete brick; con-crete building brick; concrete masonry units; linear dryingshrinkage; portland cementSUMMARY OF CHANGESCommittee C15 has identified the location
39、 of selected changes to this standard since the last issue (C55 09)that may impact the use of this standard. (Approved June 1, 2011.)(1) Section 10 was revised.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this stan
40、dard. 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 the responsible technical committee and must be revie
41、wed 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 careful consideration at a meeting of theresponsibl
42、e 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 International, 100 Barr Harbor Drive, PO Box C700, West Con
43、shohocken, 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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).C55113
