1、Standard Specification for Steel-Reinforced Polyethylene (PE) Ribbed Pipe, 300- to 1500-mm (12- to 60-in.) Diameter AASHTO Designation: MP 20-13 (2014) American Association of State Highway and Transportation Officials 444 North Capitol Street N.W., Suite 249 Washington, D.C. 20001 TS-4b MP 20-1 AAS
2、HTO Standard Specification for Steel-Reinforced Polyethylene (PE) Ribbed Pipe, 300- to 1500-mm (12- to 60-in.) Diameter AASHTO Designation: MP 20-13 (2014) 1. SCOPE 1.1. This specification covers the requirements and methods of tests for steel-reinforced polyethylene (PE) ribbed pipe, couplings, and
3、 fittings for use in surface and subsurface drainage applications. 1.1.1. Nominal sizes of 300 to 1500 mm (12 to 60 in.) are included. 1.1.2. Materials, workmanship, dimensions, pipe stiffness, impact resistance, tensile strength of seams, shape stability, joining systems, and form of markings are s
4、pecified. 1.2. Steel-reinforced PE ribbed pipe is intended for surface and subsurface drainage applications where soil provides support to its flexible walls. Its major use is to collect or convey drainage water by open gravity flow as culverts, storm drains, etc. Note 1When PE pipe is to be used in
5、 locations where the ends may be exposed, consideration should be given to protection of the exposed portions due to combustibility of the PE and the effects of prolonged exposure to ultraviolet radiation. 1.3. This specification only deals with this pipes materials requirements. The structural desi
6、gn of steel reinforced thermoplastic culverts and the proper installation procedures are given in the AASHTO LRFD Bridge Design Specifications, Section 12, and AASHTO LRFD Bridge Construction Specifications, Section 26, respectively. Upon request of the user or engineer, the manufacturer shall provi
7、de profile wall section detail required for a full engineering evaluation. 1.4. UnitsThe values stated in SI units are to be regarded as standard. Within the text, the U.S. Customary Units are shown in parentheses and may not be exact equivalents. 1.5. The following precautionary caveat pertains onl
8、y to the test method portion, Section 9, of this specification. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicab
9、ility of regulatory limitations prior to use. 2014 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-4b MP 20-2 AASHTO 2. REFERENCED DOCUMENTS 2.1. AASHTO Standards: M 288, Geotextile Specification for Highw
10、ay Applications T 341, Determination of Compression Capacity for Profile Wall Plastic Pipe by Stub Compression Loading AASHTO LRFD Bridge Design Specifications, Section 12 AASHTO LRFD Bridge Construction Specifications, Section 26 2.2. ASTM Standards: A 653/A 653M-11, Standard Specification for Stee
11、l Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process D 618, Standard Practice for Conditioning Plastics for Testing D 638, Standard Test Method for Tensile Properties of Plastics D 883, Standard Terminology Relating to Plastics D 2122, Standard Test Metho
12、d for Determining Dimensions of Thermoplastic Pipe and Fittings D 2412, Standard Test Method for Determination of External Loading Characteristics of Plastic Pipe by Parallel-Plate Loading D 2444, Standard Test Method for Determination of the Impact Resistance of Thermoplastic Pipe and Fittings by M
13、eans of a Tup (Falling Weight) D 3212, Standard Specification for Joints for Drain and Sewer Plastic Pipes Using Flexible Elastomeric Seals D 3350, Standard Specification for Polyethylene Plastics Pipe and Fittings Materials F 412, Standard Terminology Relating to Plastic Piping Systems F 477, Stand
14、ard Specification for Elastomeric Seals (Gaskets) for Joining Plastic Pipe F 2136, Standard Test Method for Notched, Constant Ligament-Stress (NCLS) Test to Determine Slow-Crack-Growth Resistance of HDPE Resins or HDPE Corrugated Pipe 3. TERMINOLOGY 3.1. The terminology used in this standard is in a
15、ccordance with the definitions given in ASTM D 883 and ASTM F 412 unless otherwise specified. 3.2. crackany break or split that extends through the wall. 3.3. creasean irrecoverable indentation, generally associated with a loss in shape stability. 3.4. delaminationa gap extending through the welded
16、lap seam between two adjacent wrap widths. 3.5. encapsulation thicknessesthe thicknesses of the high density polyethylene (HDPE) covering on both sides of the steel reinforcement as well as the thickness of the closure at the top (outside) of the rib and the thickness of the profile directly under (
17、inside) the reinforcement (see Figure 2). 3.6. gravity flowa condition in which liquid flow through a piping system results from a downward pipeline slope, but flow is less than full, except during conditions when the system may become temporarily surcharged, in which case the system is subject to t
18、emporary internal hydrostatic pressure that is limited to 74 kPa. 2014 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-4b MP 20-3 AASHTO 3.7. polyethylene (PE) plasticsplastics based on polymers made with
19、ethylene as essentially the sole monomer (ASTM D 883). 3.8. reworked plastica plastic from a processors own production that has been reground, pelletized, or solvated after having been previously processed by molding, extrusion, etc. (ASTM D 883). 3.9. seamthe portion of the helically wrapped strip
20、that overlaps and is fused to adjacent helically wrapped strips (see Figure 1). Figure 1Cross Section of Profile 3.10. shape stabilityA general measure of the pipes ability to maintain geometric and structural stability while deflected and carrying a load equal to or greater than 75 percent of its p
21、eak load-carrying capability. Peak load-carrying capability is identified as the maximum load in the load/deflection curve as measured during the flattening test as described in Section 9.2. 3.11. steel-reinforced thermoplastic pipeRibbed thermoplastic pipe with steel reinforcing strips encapsulated
22、 within the ribs (see Figure 1). 3.12. slow crack growthA phenomenon by which a stress crack may form. A stress crack is an external or internal crack in plastic caused by tensile stresses less than its short-term mechanical strength. 3.13. virgin polyethylene materialPE plastic material in the form
23、 of pellets, granules, powder, floc, or liquid that has not been subject to use or processing other than required for initial manufacture. 3.14. wrap widthThe width the helically wrapped strip covers when measured across the strip, perpendicular to the ribs (see Figure 1). 3.15. waterway wallThe min
24、imum wall thickness separating the inner and outer surfaces of the pipe wall, which is measured between pipe ribs (see Figure 2). 4. CLASSIFICATION 4.1. The steel-reinforced PE ribbed pipe covered by this specification is classified as follows: 4.1.1. Type SThis pipe shall have a full circular cross
25、 section with an essentially smooth inner wall. 4.1.2. Type SPThis pipe shall be Type S with perforations. 4.2. Perforations are described in Section 7.5. 2014 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.
26、TS-4b MP 20-4 AASHTO 5. ORDERING INFORMATION 5.1. Orders using this specification shall include the following information as necessary to adequately describe the desired product: 5.1.1. AASHTO designation and year of issue; 5.1.2. Perforation, if applicable (Section 7.5); 5.1.3. Diameter and length
27、required, either total length or length of each piece and number of pieces; 5.1.4. Certification, if desired (Section 12.1); and 5.1.5. Type of pipe joint (Section 7.12.1). 6. MATERIALS 6.1. Polyethylene Materials: 6.1.1. Pipe and FittingsPipe and fittings shall be made of virgin PE, conforming to t
28、he requirements of ASTM D 3350 and having a cell classification of 334452 C or E. Resins that have higher cell classifications in one or more properties are acceptable provided the product requirements are met. 6.1.2. Rotational Molded Fittings and CouplingsFittings and couplings shall be made of vi
29、rgin PE, conforming to the requirements of ASTM D 3350 and having a cell classification of 213320 C or E. Resins that have higher cell classifications in one or more properties are acceptable provided product requirements are met. For slow crack resistance, acceptance of resins shall be determined b
30、y using the notched, constant ligament-stress (NCLS) test according to the procedure described in Section 9.6. The average failure time of the five test specimens must exceed 24 h with no single test specimens failure time less than 17 h. 6.1.3. Injection Molded Fittings and CouplingsFittings and co
31、uplings shall be made of virgin PE, conforming to the requirements of ASTM D 3350 and having a cell classification of 324452 C or E. Resins that have higher cell classifications in one or more properties are acceptable provided product requirements are met. 6.1.4. Carbon Black ContentThe carbon blac
32、k content shall not exceed 4 percent of the total PE compound weight. 6.1.5. Other MaterialsIt is permissible to use materials other than the cell classification in Section 6.1.1 as part of the welding processes, provided these materials have higher cell classifications in one or more properties and
33、 in no way compromise the performance of the pipe products in the intended use. 6.1.6. Rework PlasticsIn lieu of virgin PE, it is permissible to use clean reworked plastic generated from the manufacturers own pipe production, provided that it meets the cell class requirements as described in Section
34、 6.1.1. 6.2. Steel Materials: 6.2.1. Steel MaterialThe steel material shall be cold- or hot-rolled, formable steel meeting the requirements of ASTM A 653/A 653M, meeting the strength requirements of Table 4 for the grade defined by the manufacturer as required for their pipes design. The steel shall
35、 have a galvanized 2014 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-4b MP 20-5 AASHTO coating. All steel materials shall be galvanized per the requirements of ASTM A 653/A 653M with a G60 minimum coati
36、ng weight. Note 2The actual strength of the steel and the rib dimensions are dependent on the manufacturers design. If requested by the purchaser, the manufacturer shall provide before purchase and delivery their pipe design and certify with delivery that the grade of steel and rib dimensions in the
37、 pipe supplied conform to their design. 6.2.2. GasketsElastomeric gaskets shall meet the requirements of ASTM F 477. 6.2.3. Industrial SealantSealants, such as moisture cure urethane or asphalt-based sealant materials used for repairs or assembly of the internal coupling joint, as recommended by the
38、 manufacturer, may be used. 7. REQUIREMENTS 7.1. WorkmanshipThe pipe and fittings shall be free of foreign inclusions and visible defects as defined herein. Visible defects shall not affect the wall integrity or the encapsulation of the steel reinforcement. The steel reinforcing materials shall not
39、be exposed. 7.2. Visible DefectsCracks, creases, delaminations, and unpigmented or nonuniformly pigmented pipe that are visible by the unaided eye are not permissible in the pipe or fittings. 7.3. There shall be no evidence of delamination when tested in accordance with Section 9.2. 7.4. Pipe Dimens
40、ions and Tolerances: 7.4.1. Inside DiameterThe tolerance on the inside diameter shall be 2.0 percent, when measured in accordance with Section 9.8.1. Pipe dimensions (for both perforated and nonperforated pipe) shall comply with Table 1. 7.4.1.1. Other diameters that are within the range of pipe siz
41、es shown in Table 1 are permissible. The minimum wall thickness and other properties shall be interpolated from the adjacent values given in Table 1. Table 1Nominal Pipe Sizes, Inside Diameters, and Minimum Waterway Wall Thicknesses Nominal Pipe Size, mm (in.) Inside Diameter, mm in.aMinimum Waterwa
42、y Wall Thickness, t1, mm in. Minimum Encapsulation Thickness (Bottom), t2, mm in. 300 (12) 300 11.81 1.1 0.043 0.9 0.035 375 (15) 375 14.76 1.2 0.047 1.0 0.039 450 (18) 450 17.72 1.3 0.051 1.3 0.051 600 (24) 600 23.62 1.5 0.059 1.5 0.059 750 (30) 750 29.53 1.5 0.059 1.5 0.059 900 (36) 900 35.43 1.7
43、0.067 1.7 0.067 1050 (42) 1050 41.34 1.8 0.071 1.8 0.071 1200 (48) 1200 47.24 1.8 0.071 1.8 0.071 1350 (54) 1350 53.15 2.0 0.079 2.0 0.079 1500 (60) 1500 59.06 2.0 0.079 2.0 0.079 aConversions of SI units to U.S. Customary units in this table are “soft” conversions; i.e., the metric measurement is m
44、athematically converted to its exact (or nearly exact) equivalent in inch-pound measurement. 7.4.2. Waterway WallMinimum waterway wall thickness shall be as required in Table 1 when measured in accordance with Section 9.8.2. 2014 by the American Association of State Highway and Transportation Offici
45、als.All rights reserved. Duplication is a violation of applicable law.TS-4b MP 20-6 AASHTO 7.4.3. LengthThe pipe shall be sold in any length agreeable to the user. Length shall not be less than 99 percent of the specified length, when measured in accordance with Section 9.8.3. 7.4.4. Encapsulation T
46、hicknessThe minimum thickness of the HDPE encapsulation at the sides, top (outside), and bottom (inside) of the reinforcement shall be as shown in Figure 2. Factory cut pipe ends shall have the cut rib ends encapsulated to meet the requirements of Figure 2 for the top (outside) of the ribs. Encapsul
47、ation thicknesses shall be measured in accordance with Section 9.8.4. Figure 2Schematic Representation of Steel-Reinforced Thermoplastic Pipe Profile 7.5. PerforationsWhen perforated pipe is specified, the perforations shall be cleanly cut and uniformly spaced along the length and circumference of t
48、he pipe. Circular perforations shall be a minimum of 5 mm (0.2 in.) and shall not exceed 10 mm (0.4 in.) in diameter. The water inlet area shall be a minimum of 30 cm2/m (1.5 in.2/ft) for pipe sizes 300 to 450 mm (12 to 18 in.) and 40 cm2/m (2.0 in.2/ft) for pipe sizes larger than 450 mm (18 in.). A
49、ll measurements shall be made in accordance with Section 9.8.5. The perforations shall be cleanly cut so as not to restrict the inflow of water. Pipe connected by bell and spigot joints may not be perforated in the area of the bells and spigots. Perforations shall be located in the waterway wall portion of the pipe between the ribs and shall not cut into encapsulation of the reinforcement, the radius between this encapsulation and the w
