AASHTO M 203M M 203-2012 Standard Specification for Steel Strand Uncoated Seven-Wire for Concrete Reinforcement.pdf
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1、Standard Specification for Steel Strand, Uncoated Seven-Wire for Concrete Reinforcement AASHTO Designation: M 203M/M 203-12 (2016) Release: Group 2 (June 2016) ASTM Designation: A416/A416M-10 American Association of State Highway and Transportation Officials 444 North Capitol Street N.W., Suite 249
2、Washington, D.C. 20001TS-4g M 203M/M 203-1 AASHTO Standard Specification for Steel Strand, Uncoated Seven-Wire for Concrete Reinforcement AASHTO Designation: M 203M/M 203-12 (2016) Release: Group 2 (June 2016) ASTM Designation: A416/A416M-10 1. SCOPE 1.1. This specification covers two types and two
3、grades of steel strand, uncoated seven-wire for use in pretensioned and post-tensioned prestressed concrete construction. The two types of strand are low-relaxation and stress-relieved (normal-relaxation). Low-relaxation strand shall be regarded as the standard type. Stress-relieved (normal-relaxati
4、on) strand will not be furnished unless specifically ordered or by arrangement between purchaser and supplier. Grade 1725 250 and Grade 1860 270 have minimum ultimate strengths of 1725 MPa 250 ksi and 1860 MPa 270 ksi, respectively, based on the nominal area of the strand. 1.2. The values stated in
5、either 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 resul
6、t in nonconformance with the specification. 1.3. The supplementary requirements in S1 shall be specified for 15.24-mm- 0.600-in.- diameter uncoated seven-wire steel strand if needed for applications in prestressed ground anchors. 2. REFERENCED DOCUMENTS 2.1. AASHTO Standard: T 244, Mechanical Testin
7、g of Steel Products 2.2. ASTM Standards: A981/A981M, Standard Test Method for Evaluating Bond Strength for 0.600-in. 15.24-mm Diameter Steel Prestressing Strand, Grade 270 1860, Uncoated, Used in Prestressed Ground Anchors E328, Standard Test Methods for Stress Relaxation Tests for Materials and Str
8、uctures 2.3. IEEE/ASTM Standard: SI 10, American National Standard for Use of the International System of Units (SI): The Modern Metric System 2.4. Military Standards: MIL-STD-129, Marking for Shipment and Storage MIL-STD-163, Steel Mill Products Preparation for Shipment and Storage 2016 by the Amer
9、ican Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.TS-4g M 203M/M 203-2 AASHTO 2.5. Federal Standard: Fed. Std. No. 123, Marking for Shipments (Civil Agencies) 3. TERMINOLOGY 3.1. Description of Term Specific to This Stan
10、dard: 3.1.1. strandall strand shall be of the seven-wire type having a center wire enclosed tightly by six helically placed outer wires with a uniform pitch of not less than 12 and not more than 16 times the nominal diameter of the strand. 3.1.1.1. DiscussionThe direction of lay may be either right
11、or left hand; however, strands of different lays should not be spliced together. 4. ORDERING INFORMATION 4.1. Orders for seven-wire low-relaxation or stress-relieved (normal-relaxation) strand under this specification should include the following information: 4.1.1. Quantity (meters) feet, 4.1.2. Di
12、ameter of strand, 4.1.3. Grade of strand, 4.1.4. Type of strand, 4.1.5. Packaging, 4.1.6. AASHTO designation and year of issue, and 4.1.7. Special requirements, if any. Note 1A typical ordering description is as follows: 25 600 m 84,000 ft, 13 mm 0.5 in., Grade 1860 270 low-relaxation strand, in 360
13、0-m 12,000-ft reelless packs conforming to M 203M/M 203-_. 5. MATERIALS AND MANUFACTURE 5.1. Base MetalThe base metal shall be carbon steel of such quality that when drawn to wire, fabricated into strand, and then thermally treated, it shall have the properties and characteristics prescribed in this
14、 specification. 5.2. WireThe wire from which the strand is to be fabricated shall be round and have a dry-drawn finish. Note 2This product is a composite of seven wires and is produced to mechanical properties only; the chemical composition of all wires or any individual wire is not pertinent to thi
15、s application, and heat identity is not necessarily maintained. It is possible that wire from more than one heat may be used in the manufacture of a reel or pack. Traceability is based on pack identity as maintained and reported by the manufacturer. 5.3. TreatmentAfter stranding, low-relaxation stra
16、nd shall be subjected to a continuous thermal-mechanical treatment to produce the prescribed mechanical properties. For stress-relieved 2016 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.TS-4g M 203M/M 203
17、-3 AASHTO (normal-relaxation) strand, only thermal treatment is necessary. Temper colors that may result from the thermal operation are considered normal for the finished appearance of this strand. 6. MECHANICAL PROPERTIES 6.1. Methods of testing for mechanical properties are described in Appendix A
18、7 of T 244. Low-relaxation strand shall also be tested as prescribed in ASTM E328. 6.2. Breaking StrengthThe breaking strength of the finished strand shall conform to the requirements prescribed in Table 1. 6.3. Yield StrengthYield strength in kN pounds shall be measured at 1 percent extension under
19、 load. The minimum yield strength shall be 90 percent for low-relaxation strand and 85 percent for stress-relieved normal-relaxation strand of the breaking strength listed in Table 1. Initial loads for the test and minimum yield strengths are listed in Table 2. Table 1Breaking Strength Requirements
20、Strand Designation No. Nominal Diameter of Strand, mm in. Minimum Breaking Strength of Strand, kN lbf Nominal Steel Area of Strand, mm2 in.2 Nominal Mass of Strand, g/m lb/1000 ft Grade 1725 250 6 6.4 0.250 40.0 9,000 23.2 0.036 182 122 8 7.9 0.313 64.5 14,500 37.4 0.058 294 197 9 9.5 0.375 89.0 20,
21、000 1.6 0.080 405 272 11 11.1 0.438 120.1 27,000 69.7 0.108 548 367 13 12.7 0.500 160.1 36,000 92.9 0.144 730 490 15 15.2 0.600 240.2 54,000 139.4 0.216 1094 737 Grade 1860 270 9 9.53 0.375 102.3 23,000 54.8 0.085 432 290 11 11.11 0.438 137.9 31,000 74.2 0.115 582 390 13 12.70 0.500 183.7 41,300 98.
22、7 0.153 775 520 13a 13.20 0.520 200.2 45,000 107.7 0.167 844 568 14 14.29 0.563 230.0 51,700 123.9 0.192 970 651 15 15.24 0.600 260.7 58,600 140.0 0.217 1102 740 16 15.75 0.620 277.4 62,370 149.2 0.231 1173 788 18 17.78 0.700 353.2 79,400 189.7 0.294 1487 1000 2016 by the American Association of Sta
23、te Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.TS-4g M 203M/M 203-4 AASHTO Table 2Yield Strength Requirements Strand Designation No. Nominal Diameter of Strand mm in. Initial Load, kN lbf Minimum Load at 1% Extension, kN lbf Low- Relaxation
24、 Normal- Relaxation Grade 1725 250 6 6.4 0.250 4.0 900 36.0 8,100 34.0 7,650 8 7.9 0.313 6.5 1,450 58.1 13,050 54.7 12,300 9 9.5 0.375 8.9 2,000 80.1 18,000 75.6 17,000 11 11.1 0.438 12.0 2,700 108.1 24,300 102.3 23,000 13 12.7 0.500 16.0 3,600 144.1 32,400 136.2 30,600 15 15.2 0.600 24.0 5,400 216.
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