1、Standard Specification for Welded Deformed Steel Bar Mats for Concrete Reinforcement AASHTO Designation: M 54M/M 54-07 (2012) ASTM Designation: A184/A184M-061American Association of State Highway and Transportation Officials 444 North Capitol Street N.W., Suite 249 Washington, D.C. 20001 TS-4g M 54M
2、/M 54-1 AASHTO Standard Specification for Welded Deformed Steel Bar Mats for Concrete Reinforcement AASHTO Designation: M 54M/M 54-07 (2012) ASTM Designation: A184/A184M-0611. SCOPE 1.1. This specification covers material in mat (or sheet) form fabricated from deformed steel bars to be used for the
3、reinforcement of concrete. Mats consist of two layers of bars that are assembled at right angles to each other. Mats shall be assembled by welding at the intersections. 1.2. This specification is applicable to orders in either SI units (M 54M) or inch-pound units (M 54). 1.3. The values stated in ei
4、ther inch-pound units or SI units are to be regarded as standard. Within the text, the inch-pound units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result
5、in nonconformance with this specification. 2. REFERENCED DOCUMENTS 2.1. AASHTO Standard: M 31M/M 31, Deformed and Plain Carbon-Steel Bars for Concrete Reinforcement 2.2. ASTM Standards: A700-05, Standard Practices for Packaging, Marking, and Loading Methods for Steel Products for Shipment (withdrawn
6、 2014) A706/A706M, Standard Specification for Deformed and Plain Low-Alloy Steel Bars for Concrete Reinforcement 2.3. Military Standard: MIL-STD-129, Marking for Shipment and Storage 2.4. Federal Standard: Fed. Std. No. 123, Marking for Shipments (Civil Agencies) 3. ORDERING INFORMATION 3.1. It shal
7、l be the responsibility of the purchaser to specify all requirements that are necessary for material ordered. Such requirements shall include, but are not limited to, the following: 3.1.1. Quantity; 2015 by the American Association of State Highway and Transportation Officials.All rights reserved. D
8、uplication is a violation of applicable law.TS-4g M 54M/M 54-2 AASHTO 3.1.2. Size and spacing of members in each direction; 3.1.3. Grade required 280, 420 40, 60; 3.1.4. Type of steel as appropriate (Section 4); and 3.1.5. AASHTO M 54M/M 54 and year of issue. Note 1A typical ordering description is
9、as follows: 1000 bar mats to M 54M-_; fabricated from Grade 280 bars to M 31M-_; 150 by 150 mm; No. 10 by 3000 mm longitudinal tip to tip, outer bars spaced 1350 mm; No. 10 by 1500 mm transverse, outer bars spaced 2850 mm. 1000 bar mats to M 54-_; Grade 40; 6 by 6 in.; No. 4 by 120 in. longitudinal
10、tip to tip, outer bars spaced 54 in.; No. 3 by 60 in.; transverse, outer bars spaced 114 in. 4. MATERIAL AND MANUFACTURE 4.1. Deformed steel bars of Grades 280 40 used in the manufacture of welded mats shall conform to M 31M M 31. Deformed steel bars of Grade 420 60 used in the manufacture of welded
11、 mats shall conform to M 31M M 31 or ASTM A706M A706. 5. FABRICATION 5.1. Fabricated mats shall be composed of two layers of bars substantially parallel and perpendicular to each other. 5.1.1. Mats shall be assembled by means of welding to provide attachment at intersections. 5.1.1.1. Welds shall pr
12、ovide attachment at all exterior intersections and at not less than alternate interior intersections. 5.1.1.2. The separation of 5 percent or less of all welded intersections of any mat shall not be cause for rejection provided that no more than half of the welds on any one bar are separated. 5.1.1.
13、3. Welding shall be performed in such a manner that the strength and ductility requirements of the material specification in Section 4 are met when a specimen is tested across a point of weld. Note 2Welding of the mat intersections has generally been performed without problems, but care should be ta
14、ken when welding reinforcing bars with carbon equivalent levels above 0.55 percent, in order to prevent cracking in the weld area. 6. MECHANICAL PROPERTIES 6.1. Mats shall be capable of withstanding a static load of 670 N 150 lbf exerted perpendicular to the plane of the mat tending to separate the
15、bars, with no apparent loosening when applied to one intersection of connected bars. 6.2. Number of Tests: 6.2.1. One sample consisting of not fewer than two connections on the same transverse member shall be tested for conformance with the provisions of Sections 5.1.1.3 and 6.1 from each 7000 m275,
16、000 ft2 of mats or fraction thereof. 2015 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-4g M 54M/M 54-3 AASHTO 6.3. Test Methods: 6.3.1. Tension test specimens for determining conformance with Section 5.
17、1.1.3 shall have a welded joint located approximately at the center of the bar being tested, and the cross bar shall extend approximately 25 mm 1 in. beyond each side. All unit stress determinations shall be based on the nominal area calculated using the nominal diameter specified. 6.3.2. Tests of c
18、onnections against separation may be performed on an assembled mat by placing blocks under a deformed bar in the upper layer and applying the prescribed load upon the bar in the lower layer. 7. SIZE, DIMENSIONS, AND TOLERANCES 7.1. Size and Spacing DimensionsThe sizes, spacings, dimensions, and arra
19、ngement of the bar mats shall conform to the design specified by the purchaser. Bars shall extend beyond exterior intersections a distance of not less than 25 mm 1 in. The spacing of bars shall average that specified in the design, and the space between individual bars shall not vary more than 6 mm
20、1/4in. from that specified. 7.2. Width and Length TolerancesThe overall length or width of the mats shall not be more than 25 mm 1 in. greater or less than the specified dimension. 8. FINISH AND SURFACE CONDITION 8.1. The finished mats shall be free of injurious defects in material or workmanship. 8
21、.2. Rust, surface seams, surface irregularities, or mill scale shall not be cause for rejection provided the mass; dimensions, including height of deformation; cross-sectional area; and tensile properties of a hand wire-brushed test specimen are not less than the requirements of this specification.
22、9. REJECTION AND RETESTS 9.1. Fabricated mats that do not meet the requirements of this specification shall be rejected and reported to the supplier within five working days from the receipt of samples by the purchaser. 9.2. In case a test specimen fails to meet the provisions of Section 6.1, two ad
23、ditional samples shall be selected and tested. All retest specimens shall meet the requirements of this specification. 9.3. In case a test specimen fails to meet the provisions of Section 5.1.1.3, all of the remaining bars on the transverse member shall be tested and the average of all tests (includ
24、ing the original test) shall meet the requirements specified in Section 5.1.1.3. 10. INSPECTION AND TEST REPORTS 10.1. InspectionThe inspector representing the purchaser shall have free entry, at all times, while work on the contract of the purchaser is being performed, to all parts of the manufactu
25、rers plant that concern the fabrication of the mats ordered. The manufacturer shall afford the inspector all reasonable facilities to satisfy that the mats are being furnished in accordance with this specification. All tests and inspection shall be made at the place of fabrication prior to shipment,
26、 unless otherwise specified and shall be so conducted as not to interfere unnecessarily with fabricating operations. Inspection as to general workmanship shall be visual. 2015 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of
27、 applicable law.TS-4g M 54M/M 54-4 AASHTO 10.2. Test Reports on Bar MaterialThe manufacturer shall supply test reports showing that the material used in the fabrication of the mats as delivered has fulfilled the tension and bend test requirements of the specified type and grade described in Section
28、4. The reports shall show the manufacturers test identification numbers, including the identity of the material. 10.3. A material test report, certificate of inspection, or similar document printed from or used in electronic form from an electronic data interchange (EDI) shall be regarded as having
29、the same validity as a counterpart printed in the certifiers facility. The content of the EDI transmitted document must meet the requirements of the invoked AASHTO standard(s) and conform to any existing EDI agreement between the purchaser and the supplier. Notwithstanding the absence of a signature
30、, the organization submitting the EDI transmission is responsible for the content of the report. Note 3The industry definition as invoked here is: EDI is the computer-to-computer exchange of business information in a standard format such as that used by ANSI ASC X12. 10.4. For Government Procurement
31、 OnlyExcept as otherwise specified in the contract, the contractor shall be responsible for the performance of all inspection and test requirements specified herein. Except as otherwise specified in the contract, the contractor may use his or her own or any other suitable facilities for the performa
32、nce of the inspection and test requirements specified herein, unless disapproved by the purchaser at the time of purchase. The purchaser shall have the right to perform any of the inspections and tests at the same frequency as set forth in this specification where such inspections are deemed necessa
33、ry to assure that material conforms to prescribed requirements. 11. REHEARING 11.1. Samples tested in accordance with this specification that represent rejected material shall be preserved for two weeks from the date rejection is reported to the manufacturer. In case of dissatisfaction with the resu
34、lts of the tests, the manufacturer shall have the right to make claim for a hearing within that time. 12. PACKAGING AND PACKAGE MARKING 12.1. Packaging, marking, and loading for shipment shall be in accordance with ASTM A700-05. 12.2. When specified in the contract or order, and for direct procureme
35、nt by or direct shipment to the U.S. government, marking for shipment, in addition to requirements specified in the contract or order, shall be in accordance with MIL-STD-129 for military agencies and with Fed. Std. No. 123 for civil agencies. 12.3. Each bundle of mats shall be marked with a suitable tag showing the name of the manufacturer and other markings to identify it with the order. 2015 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.
