ASTM C478M currently has two acceptance methods for manhole flat slab tops; section 220.127.116.11 covers acceptance on the basis of a proof-of-design test; section 18.104.22.168 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;
Ballot Item Approved as C478M-2014 and Pending Publication