ASTM C478M currently has two acceptance methods for manhole flat slab tops; section 22.214.171.124 covers acceptance on the basis of a proof-of-design test; section 126.96.36.199 covers acceptance on the basis of a rational design. Currently ASTM C478M has one acceptance method for the 3 types of manhole base slabs following a rational design method. This work item would add a provision to ASTM C478M for acceptance of manhole base slabs based on a proof-of-design test.
Keywordsabsorption; acceptance criteria; base sections; compressive strength; concrete; cone tops; design; flat slab tops; grade rings; ladders; manhole; manufacture; reinforced; riser sections; sewer; steps; tests; water ;
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