1、Designation: C55 14aStandard 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 indic
2、ates 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 U.S. Department of Defense.1. Scope*1.1 This specification covers solid, dry-cast, concrete build-ing brick intende
3、d for 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 (previo
4、usly referred 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 prope
5、rties 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 refe
6、rences 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 forin
7、formation 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 densityclassification, high compressive strength, surface textures for appearanceor bond, finish, color, fire r
8、esistance, 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 regar
9、dedas 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
10、 Units and Related UnitsC150 Specification for Portland CementC331 Specification for Lightweight Aggregates for ConcreteMasonry UnitsC426 Test Method for Linear Drying Shrinkage of ConcreteMasonry UnitsC595 Specification for Blended Hydraulic CementsC618 Specification for Coal Fly Ash and Raw or Cal
11、cinedNatural Pozzolan for Use in ConcreteC989 Specification for Slag Cement for Use in Concrete andMortarsC1157 Performance Specification for Hydraulic CementC1232 Terminology of MasonryC1634 Specification for Concrete Facing Brick3. Terminology3.1 Terminology defined in Terminology C1232 shall appl
12、yfor 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-fa
13、cing, 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 uni
14、t 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
15、on Concrete Masonry Units and Related Units.Current edition approved Dec. 1, 2014. Published January 2015. Originallyapproved in 1924. Last previous edition approved in 2014 as C55 14. DOI:10.1520/C0055-14A.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer
16、 Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 1
17、9428-2959. United States14.1.1 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 requirement
18、s of 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 PozzolansSpecifica
19、tion 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 Cons
20、tituentsAir-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 detrimen
21、tal 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.Allunits shall be sound and free of cracks or other
22、defects thatinterfere with the proper placement of the units or significantlyimpair the strength or permanence of the construction. Minorcracks incidental to the usual method of manufacture or minorchipping resulting from customary methods of handling inshipment and delivery are not grounds for reje
23、ction.5.1.1 When higher compressive strengths than those listedin 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
24、 compressive strength is less than5000 psi, no single unit net 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
25、be less than 90 % of the specified compressivestrength.5.2 At 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, partner
26、ship, or individual entering into a contract or agree-ment to 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 manuf
27、acturer or the manufacturers agenttransports the concrete building 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 a
28、re themanufacturers designated dimensions. Nominal dimensions 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.
29、4 mm).6.2 CoringUnless otherwise specified, brick shall be ei-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 th
30、e same plane. No partof any hole shall be less than34 in. (19.1 mm) from any edgeof the unit.7. Finish and Appearance7.1 No more than 5 % of the units in the shipment shallexhibit one or more of the characteristics described in 7.1.1 and7.1.2.7.1.1 Units with dimensions not meeting the requirementso
31、f 6.1.7.1.2 Units that are broken.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 of manufacture from the lots readyfor delivery.8.2 Compressive strength, absorption, den
32、sity, and dimen-sional tolerances shall be based on tests of concrete buildingbrick of any configuration or dimensions made with the samematerials, concrete mix design, manufacturing process, andcuring method, conducted in accordance with Test MethodsC140 and within 12 months of production of the un
33、its.8.3 Total linear drying shrinkage shall be based on tests ofconcrete building brick of any configuration or dimensionsTABLE 1 Strength, Absorption, and Density Classification RequirementsADensityClassificationOven-Dry Densityof Concrete, lb/ft3(kg m3)Maximum WaterAbsorption, lb/ft3(kg m3)Minimum
34、 Net AreaCompressive Strength, lb/in2(MPa)Average of 3 Units Average of 3 Units Individual Units Average of 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
35、Weight 125 (2000) or more 13 (208) 15 (240) 2500 (17.2) 2000 (13.8)AAverage oven-dry density, based on a set of three units, shall fall within ranges defined in the table to be classified as lightweight, medium weight, or normal weight.C55 14a2made with the same materials, concrete mix design, manuf
36、ac-turing process, and curing method, conducted in accordancewith Test Method C426 and within 24 months of production ofthe units.9. Compliance9.1 If a sample fails to conform to the specifiedrequirements, the manufacturer shall be permitted to removeunits from the shipment. A new sample shall be se
37、lected by thepurchaser from remaining units from the shipment with asimilar configuration and dimension and tested at the expenseof the manufacturer. If the second sample meets the specifiedrequirements, the remaining portion of the shipment repre-sented by the sample meets the specified requirement
38、s. If thesecond sample fails to meet the specified requirements, theremaining portion of the shipment represented by the samplefails to meet the specified requirements.NOTE 6Unless otherwise specified in the purchase order, the costs oftests is typically borne as follows: (1) if the results of the t
39、ests 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 conform to the specification requirements, the cost is typically borneby the purchaser.10. Keywords10.1 absorption; compressi
40、ve strength; concrete brick; con-crete building brick; concrete masonry units; linear dryingshrinkage; portland cementSUMMARY OF CHANGESCommittee C15 has identified the location of selected changes to this standard since the last issue (C55 14)that may impact the use of this standard. (December 1, 2
41、014)(1) Revised Section 8 to add a 12-month frequency for C140tests.Committee C15 has identified the location of selected changes to this standard since the last issue (C55 11)that may impact the use of this standard. (Approved July 1, 2014.)(1) Subsection 5.1 and Section 7 were revised related to f
42、inishand appearance of units.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 patent rights, and the riskof inf
43、ringement 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 either for revision of this stand
44、ard 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 hearing you shouldmake your vi
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