AASHTO M 259M-11 pdf free download
AASHTO M 259M-11 pdf free download.Precast Reinforced Concrete Box Sections for Culverts, Storm Drains, and Sewers [Metric].
5. BASIS OF ACCEPTANCE 5.1. Acceptability of the box sections produced in accordance 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 to the requirements of this specification. 6. MATERIAL S 6.1.1. Reinforced Concrete– The 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: 6.2.1. Cement- Cement 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 shall not exceed 25 percent by mass. 6.2.2. Fly Ash- -Fly ash shall conform to the requirements of M 295, Class F or Class C. 6.2.3. Allowable Combinations of Cementitious Materials- -The combination of cementitious materials used in the 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.6.2.3.4. A combination of portland cement and fly ash wherein the proportion of fly ash is between 5 and 25 percent by mass of total cementitious materials (portland cement plus fly ash). 6.3. Aggregates- Aggregates shall conform to M 6 and M 80, except that the requirements for gradation shall not apply. 6.4. Admixtures and Blends- Admixtures and blends may be used with the approval of the owner. 6.5. Steel Reinforcement- -Reinforcement shall consist of welded wire fabric conforming to M 55M/M 55 or M 221M/M 221. 6.6. Synthetic Fibers- Collated fibrillated virgin polypropylene fibers may be used, at the owner’s option, in concrete pipe 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 shall be accepted. 7. DESIGN 7.1. Design Tables- -The box section dimensions, compressive strength of the concrete, and reinforcement details shall be as prescribed in Tables 1, 2, or 3 and Figures 1, 2, and 3, subject to the provisions of Section 11. Table 1 sections are designed for combined earth dead load and AASHTO HS20 live load conditions. Table 2 sections are designed for combined earth dead load and interstate live load conditions when the interstate live loading exceeds the HS20 live loading. Table 3 sections are designed for earth dead load conditions only. Criteria used to develop Tables 1, 2, and 3 are given in Appendix X1. For modifications to the designs shown in Tables 1, 2, and 3 due to anticipated earth and surcharge loads different from those used to develop the tables, see Appendix X2.7.2. Modified and Special Designs- -The manufacturer may request approval by the owner of modified designs that differ from the designs in Section 7, or special designs for sizes and loads other than those shown in Tables 1, 2, and 3. Note 4 The tabular designs in this specification were prepared according to AASHTO’s Standard Specifications for Highway Bridges, Eleventh Edition, 1973. The current AASHTO Standard Specifications for Highway Bridges allows concrete shear stress criteria that differ from the 1973 criteria. The use of current AASHTO concrete shear stress criteria shall be acceptable by this specification for modified or special designs.AASHTO M 259M-11 pdf download.
