1、Designation: C55 14aC55 16Standard 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.Anumber in parentheses i
2、ndicates the year of last reapproval.Asuperscriptepsilon () 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 building brick intend
3、ed for interior and exterior use in constructingstructural masonry, and are made from portland cement, water, and suitable mineral aggregates with or without the inclusion ofother materials.NOTE 1Specification C1634 addresses concrete facing brick used in facing applications and other exposures (pre
4、viously referred to in earlier editionsof this standard as Grade Nfor use as architectural veneer and facing units in exterior walls and for use where high-strength and resistance to moisturepenetration and severe frost action are desired). This specification differs from C1634 in that it addresses
5、properties for concrete building brick used innon-facing, utilitarian applications (previously referred to in earlier editions of this specification as Grade Sfor general use where moderate strengthand resistance to frost action and moisture penetration are required).1.2 The text of this specificati
6、on references 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.1.3 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses
7、 are for informationonly.NOTE 2Concrete building brick covered by this specification are made from lightweight or normal weight aggregates, or both.NOTE 3When particular features are desired, such as density classification, high compressive strength, surface textures for appearance or bond, finish,c
8、olor, fire resistance, insulation, acoustical properties, or other special features, such properties should be specified separately by the purchaser. Suppliersshould be consulted as to the availability of concrete building brick having the desired features.1.4 The values stated in inch-pound units a
9、re to be regarded as standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information only and are not considered standard.2. Referenced Documents2.1 ASTM Standards:2C33 Specification for Concrete AggregatesC140 Test Methods for Sampling and Testing
10、 Concrete Masonry Units and Related UnitsC150 Specification for Portland CementC331 Specification for Lightweight Aggregates for Concrete Masonry UnitsC426 Test Method for Linear Drying Shrinkage of Concrete Masonry UnitsC595 Specification for Blended Hydraulic CementsC618 Specification for Coal Fly
11、 Ash and Raw or Calcined Natural Pozzolan for Use in ConcreteC989 Specification for Slag Cement for Use in Concrete and MortarsC1157 Performance Specification for Hydraulic CementC1232 Terminology of MasonryC1634 Specification for Concrete Facing Brick3. Terminology3.1 Terminology defined in Termino
12、logy C1232 shall apply for this specification.3.2 Definitions of Terms Specific to This Standard:1 This specification is under the jurisdiction of ASTM Committee C15 on Manufactured Masonry Units and is the direct responsibility of Subcommittee C15.03 onConcrete Masonry Units and Related Units.Curre
13、nt edition approved Dec. 1, 2014Dec. 1, 2016. Published January 2015December 2016. Originally approved in 1924. Last previous edition approved in 2014 asC55 14.C55 14a. DOI: 10.1520/C0055-14A.10.1520/C0055-16.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Custome
14、r Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, 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 p
15、revious 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 is to be considered the official document.*A Summary of
16、Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13.2.1 concrete building brick, na concrete masonry unit, with a maximum width of four (4) inches and of a weight that willtypically per
17、mit it to be lifted and placed with one hand, that is manufactured for general use in non-facing, utilitarian applications.3.2.2 concrete facing brick, na concrete masonry unit, with a maximum width of four (4) inches and of a weight that willtypically permit it to be lifted and placed with one hand
18、, that is manufactured to be typically used in an application where one ormore faces of the unit is intended to be exposed.4. Materials and Manufacture4.1 Cementitious MaterialsMaterials shall conform to the following applicable specifications:4.1.1 Portland CementSpecification C150.4.1.2 Modified P
19、ortland CementPortland cement conforming to Specification C150, modified as follows:4.1.2.1 LimestoneCalcium carbonate, with a minimum 85 % CaCO3 content, is permitted to be added to the cement, providedthese requirements of Specification C150 as modified are met:(1) Limitation on Insoluble Residue1
20、.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 C618.4.1.6 Blast Furnace Slag CementSpecification C989.4.2 AggregatesAgg
21、regates shall conform to the following specifications, except that grading requirements shall notnecessarily apply:4.2.1 Normal Weight AggregatesSpecification C33.4.2.2 Lightweight AggregatesSpecification C331.4.3 Other ConstituentsAir-entraining agents, coloring pigments, integral water repellents,
22、 finely ground silica, and otherconstituents shall be previously established as suitable for use in concrete masonry units and shall conform to applicable ASTMstandards or shall be shown by test or experience not to be detrimental to the durability of the concrete masonry units or anymaterial custom
23、arily used in masonry construction.5. Physical Requirements5.1 At the time of delivery to the purchaser, units shall conform to the physical requirements prescribed in Table 1. All unitsshall be sound and free of cracks or other defects that interfere with the proper placement of the units or signif
24、icantly impair thestrength or permanence of the construction. Minor cracks incidental to the usual method of manufacture or minor chippingresulting from customary methods of handling in shipment and delivery are not grounds for rejection.5.1.1 When higher compressive strengths than those listed in T
25、able 1 are specified, the tested average net area compressivestrength of three units shall equal or exceed the specified compressive strength, and the following single unit strength requirementsshall apply.5.1.1.1 When the specified compressive strength is less than 5000 psi, no single unit net area
26、 compressive strength test resultshall be less than the specified compressive strength minus 500 psi. Compressive strength shall be tested in accordance with 8.2.5.1.1.2 When the specified compressive strength is 5000 psi or greater, no single unit net area compressive strength test resultshall be l
27、ess than 90 % of the specified compressive strength. Compressive strength shall be tested in accordance with 8.2.5.2 At the time of delivery to the purchaser, the average total linear drying shrinkage of the three units tested shall not exceed0.065 % when tested in accordance with Test8.3 Method C42
28、6.NOTE 4The purchaser is the public body or authority, association, corporation, partnership, or individual entering into a contract or agreement topurchase or install, or both, concrete building brick. The time of delivery to the purchaser is FOB plant when the purchaser or the purchasers agenttran
29、sports the concrete building brick, or at the time unloaded at the worksite if the manufacturer or the manufacturers agent transports the concretebuilding brick.TABLE 1 Strength, Absorption, and Density Classification RequirementsADensityClassificationOven-Dry Densityof Concrete, lb/ft3 (kg m3)Maxim
30、um WaterAbsorption, lb/ft3 (kg m3)Minimum 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 (24
31、0) 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 set of three units, shall fall within ranges defined in the tableCompressive strength, absorption, and density determined inaccordance with 8.2to be clas
32、sified as lightweight, medium weight, or normal weightC55 1626. Dimensions and Permissible Variations6.1 No overall dimension (width, height, and length) shall differ by more than 618 in. (3.2 mm) from the specified standarddimensions.NOTE 5Standard dimensions of concrete building brick are the manu
33、facturers designated dimensions. Nominal dimensions of modular size concretebuilding brick are equal to the standard dimensions plus the thickness of one mortar joint. Nominal dimensions of nonmodular size concrete building brickusually exceed the standard dimensions by 18 to 14 in. (3.2 to 6.4 mm).
34、6.2 CoringUnless otherwise specified, brick shall be either solid or cored at the option of the seller. For cored concretebuilding brick, the net cross-sectional area in any plane parallel to the surface containing the cores shall be at least 75 % of thegross cross-sectional area measure in the same
35、 plane. No part of any hole shall be less than 34 in. (19.1 mm) from any edge ofthe unit.7. Finish and Appearance7.1 No more than 5 % of the units in the shipment shall exhibit one or more of the characteristics described in 7.1.1 and 7.1.2.7.1.1 Units with dimensions not meeting the requirements of
36、 6.1.7.1.2 Units that are broken.8. Methods of Sampling and Testing8.1 The purchaser or authorized representative shall be accorded proper facilities to inspect and sample the concrete buildingbrick at the place of manufacture from the lots ready for delivery.8.2 Compressive strength, absorption, de
37、nsity, and dimensional tolerances shall be based on tests of concrete building brick ofany configuration or dimensions made with the same materials, concrete mix design, manufacturing process, and curing method,conducted in accordance with Test Methods C140 and within 12 months of production of the
38、units.8.3 Total linear drying shrinkage shall be based on tests of concrete building brick of any configuration or dimensions made withthe same materials, concrete mix design, manufacturing process, and curing method, conducted in accordance with Test MethodC426 and within 24 months of production of
39、 the units.9. Compliance9.1 If a sample fails to conform to the specified requirements, the manufacturer shall be permitted to remove units from theshipment. A new sample shall be selected by the purchaser from remaining units from the shipment with a similar configurationand dimension and tested at
40、 the expense of the manufacturer. If the second sample meets the specified requirements, the remainingportion of the shipment represented by the sample meets the specified requirements. If the second sample fails to meet the specifiedrequirements, the remaining portion of the shipment represented by
41、 the sample fails to meet the specified requirements.NOTE 6Unless otherwise specified in the purchase order, the costs of tests is typically borne as follows: (1) if the results of the tests show that theunits do not conform to the requirements of this specification, the cost is typically borne by t
42、he seller; (2) if the results of the tests show that the unitsconform to the specification requirements, the cost is typically borne by the purchaser.10. Keywords10.1 absorption; compressive strength; concrete brick; concrete building brick; concrete masonry units; linear drying shrinkage;portland c
43、ementSUMMARY OF CHANGESCommittee C15 has identified the location of selected changes to this standard since the last issue(C55 14C55 14a) that may impact the use of this standard. (December 1, 2014)2016)(1) RevisedSubsections 5.1.1.1Section, 85.1.1.2, 5.2, and Table 1to add a 12-month frequency for
44、C140 tests. were modified toclarify determining of compliance for physical properties.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 re
45、vised related to finish and appearance of units.C55 163ASTM 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
46、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 reviewed every five years andif not revised, either reapproved or withdrawn.Your comments are invited either f
47、or 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 theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair heari
48、ng 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 Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard m
49、ay 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 Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 164
