ASTM C478 currently has two acceptance methods for manhole flat slab tops; section 18.104.22.168 covers acceptance on the basis of proof-of-design test; section 22.214.171.124 covers acceptance on the basis of rational design. Currently, ASTM C478 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 C478 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 ;
Ballot Item Approved as C478-2014 and Pending Publication