AASHTO R 73:16(2020) Standard Practice for Evaluation of Precast Concrete Drainage Products.
1.1.AASHTO R 73 practice describes the evaluation of precast concrete pipe, box culverts, manholes, and drainage inlets. This standard also describes criteria for acceptable products, repairable products, and the rejection of defective products. All repairs shall conform to the criteria found in this document or to contract documents as applicable.
1 .2. This standard practice is applicable to storm water management precast concrete products, manufactured by both the wet cast and dry cast production methods, after curing and prior to installation.
1.3. This standard practice covers the inspection of finished products manufactured per M 86M1M 86,
M 170. M 199M/M 199, M 206M/M 206, M 207M/M 207, M 242M/M 242, M 259, and M 273; and ASTM C443, C858. C913, C985, C1417, C1433, C1504. and C1577.
1 .4. Evaluation guidelincs arc included for the folloit’ing conditions:
• manufacturing defects, and
• damaged ends.
1 .5. This standard practice is not intended for the evaluation of installed precast concrete pipe, box culverts, three-sided structures, manholes, drainage inlets, or other precast products.
2. REFERENCED DOCUMENTS
2.1. AASHTO Standards:
• M 86M/M 86, Nonreinforced Concrete Sewer, Storm Drain, and Culvert Pipe
• M 170, Reinforced Concrete Culvert. Storm Drain, and Sewer Pipe
• M 199M/M 199, Precast Reinforced Concrete Manhole Sections
• M 206M/M 206. Reinforced Concrete Arch Culvert, Storm Drain, and Sewer Pipe
• M 207M/M 207, Reinforced Concrete Elliptical Culvert, Storm Drain, and Sewer Pipe
• M 242M/M 242, Reinforced Concrete D-Load Culvert, Storm Drain, and Sewer Pipe
• M 259, Precast Reinforced Concrete Box Sections for Culverts, Storm Drains, and Sewers
• M 273, Precast Reinforced Concrete Box Sections for Culverts, Storm Drains, and Sewers with Less Than 2 ft of Cover Subjected to Highway Loadings
3.2. bleedout —leakage of the paste (cement, water, air, and fine aggregate particles) through form gaps and seams of the form that results in small voids or openings between coarse aggregate particles.
3.3. hug holes—bug holes are small irregular cosmetic cavities typically resulting from entrapment of air bubbles or water on the surface of formed concrete during placement and consolidation.
3.4. chip—physical damage (breakage) of the corner or edges of the product.
3.5. damage—physical harm which impairs the product’s normal performance.
3.6. dry cast/packerhead concrete—a low water—cementitious materials ratio concrete (zero slump) cast by a method in which the product is dernolded immediately after consolidating.
3.7. honeycomb—failure of mortar to completely surround coarse aggregate in concrete, leaving empty spaces (voids) between the coarse aggregate particles.
3.8. ruling—a series of tool marks resembling spiral grooves on the interior ot’ a round structure. These grooves are caused by the manufacturing process and are not typically an indication of insufficient reinforcement cover.AASHTO R 73 pdf download.