AASHTO M 273M-2017 Standard Specification for Precast Reinforced Concrete Box Sections for Culverts Storm Drains and Sewers with Less Than 0.6 m of Cover Subjected to Highway Loadi.pdf
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1、Standard Specification for Precast Reinforced Concrete Box Sections for Culverts, Storm Drains, and Sewers with Less Than 0.6 m of Cover Subjected to Highway Loadings Metric AASHTO Designation: M 273M-171 Technical Section: 4a, Concrete Drainage Structures Release: Group 2 (June 2017) American Assoc
2、iation of State Highway and Transportation Officials 444 North Capitol Street N.W., Suite 249 Washington, D.C. 20001 TS-4a M 273M-1 AASHTO Standard Specification for Precast Reinforced Concrete Box Sections for Culverts, Storm Drains, and Sewers with Less Than 0.6 m of Cover Subjected to Highway Loa
3、dings Metric AASHTO Designation: M 273M-171Technical Section: 4a, Concrete Drainage Structures Release: Group 2 (June 2017) 1. SCOPE 1.1. This specification covers single-cell, precast reinforced concrete box sections with less than 0.6 m of cover subjected to highway loadings and intended to be use
4、d for the construction of culverts and for the conveyance of storm water, industrial wastes, and sewage. 1.2. This metric specification is equivalent to M 273 and is compatible in technical content. Note 1This specification is primarily a manufacturing and purchasing specification. However, standard
5、 designs are included and the criteria used to develop these designs are given in Appendix X1. The successful performance of this product depends on the proper selection of the box section, bedding, backfill, controlled manufacture in the plant, and care that the installation conforms to the constru
6、ction specifications. The owner of the precast reinforced concrete box sections specified herein is cautioned that the loading conditions and the field requirements must be correlated with the box sections specified and inspection must be provided at the construction site. Note 2AASHTO M 259M is to
7、be used for box sections subjected to highway loading with 0.6 m or more earth cover, or subjected to dead load only. Note 3If load-and-resistance factor design (LRFD) is required, then use ASTM C1577. 2. REFERENCED DOCUMENTS 2.1. AASHTO Standards: M 6, Fine Aggregate for Hydraulic Cement Concrete M
8、 31M/M 31, Deformed and Plain Carbon and Low-Alloy Steel Bars for Concrete Reinforcement M 32M/M 32, Steel Wire, Plain, for Concrete Reinforcement M 55M/M 55, Steel Welded Wire Reinforcement, Plain, for Concrete M 80, Coarse Aggregate for Hydraulic Cement Concrete M 85, Portland Cement M 157, Ready-
9、Mixed Concrete M 221M/M 221, Steel Welded Wire Reinforcement, Deformed, for Concrete 2017 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-4a M 273M-2 AASHTO M 225M/M 225, Steel Wire, Deformed, for Concrete
10、 Reinforcement M 240M/M 240, Blended Hydraulic Cement M 259M, Precast Reinforced Concrete Box Sections for Culverts, Storm Drains, and Sewers Metric M 262, Concrete Pipe and Related Products M 295, Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete T 22, Compressive Strength of Cy
11、lindrical Concrete Specimens T 23, Making and Curing Concrete Test Specimens in the Field T 280, Concrete Pipe, Manhole Sections, or Tile Standard Specifications for Highway Bridges 2.2. ASTM Standards: C309-03, Standard Specification for Liquid Membrane-Forming Compounds for Curing Concrete C1116/C
12、1116M, Standard Specification for Fiber-Reinforced Concrete C1577, Standard Specification for Precast Reinforced Concrete Monolithic Box Sections for Culverts, Storm Drains, and Sewers Designed According to AASHTO LRFD 3. TERMINOLOGY 3.1. DefinitionsFor definitions of terms relating to concrete pipe
13、, see M 262. 4. TYPES 4.1. Precast reinforced concrete box sections manufactured in accordance with this specification shall be of the types identified in Tables 1 and 2, and shall be designated by type, span, and rise. 5. BASIS OF ACCEPTANCE 5.1. Acceptability of the box sections produced in accord
14、ance with Section 7 shall be determined by the results of the concrete compressive strength tests described in Section 10, by the material requirements described in Section 6, and by inspection of the finished box sections. 5.2. Box sections shall be considered ready for acceptance when they conform
15、 to the requirements of this specification. 6. MATERIALS 6.1. Reinforced ConcreteThe reinforced concrete shall consist of cementitious materials, mineral aggregates, and water in which steel has been embedded in such a manner that the steel and concrete act together. 6.2. Cementitious Materials: 6.2
16、.1. CementCement shall conform to the requirements for portland cement of M 85 or shall be portland blast-furnace slag cement or portland-pozzolan cement conforming to the requirements of M 240M/M 240, except that the pozzolan constituent in the Type IP portland-pozzolan cement shall be fly ash and
17、shall not exceed 25 percent by mass. 2017 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-4a M 273M-3 AASHTO 6.2.2. Fly AshFly ash shall conform to the requirements of M 295, Class F or Class C. 6.2.3. All
18、owable Combinations of Cementitious MaterialsThe combination of cementitious materials used in concrete shall be one of the following: 6.2.3.1. Portland cement only, 6.2.3.2. Portland blast-furnace slag cement only, 6.2.3.3. Portland-pozzolan cement only, or 6.2.3.4. A combination of portland cement
19、 and fly ash wherein the proportion of fly ash is between 5 and 25 percent by mass of total cementitious material (portland cement plus fly ash). 6.3. AggregatesAggregates shall conform to M 6 and M 80, except that the requirements for gradation shall not apply. 6.4. Admixtures and BlendsAdmixtures
20、and blends may be used with the approval of the owner. 6.5. Steel ReinforcementReinforcement shall consist of welded wire fabric conforming to M 55M/M 55 or M 221M/M 221. Longitudinal distribution reinforcement may consist of welded wire fabric or deformed billet-steel bars conforming to M 31M/M 31,
21、 Grade 400. 6.6. Synthetic FibersPolypropylene fibers may be used, at the owners option, in concrete box section as a nonstructural manufacturing material. Only Type III synthetic fibers designed and manufactured specifically for use in concrete and conforming to the requirements of ASTM C1116/C1116
22、M shall be accepted. 6.7. WaterMix water shall conform with M 157, Section 4.1.4, with a maximum limit of 0.15 percent chloride. 7. DESIGN 7.1. Design TablesThe box section dimensions, compressive strength of the concrete, and reinforcement details shall be as prescribed in Tables 1 or 2 and Figures
23、 1 and 2, subject to the provisions of Section 11. Table 1 sections are designed for a cover range from 0 to 0.6 m plus AASHTO HS20 live load conditions. Table 2 sections are designed for a cover range from 0 to 0.6 m plus Interstate live load conditions. Criteria used to develop Tables 1 and 2 are
24、given in Appendix X1. 7.2. Modified and Special DesignsThe manufacturer may request approval by the owner of modified designs that differ from the designs in Section 7.1, or for special designs for sizes and loads other than those shown in Tables 1 and 2. 2017 by the American Association of State Hi
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