We've been seeing more precast box structures for small wastewater plant applications. Most are two or three piece stacked similar to manholes. Concern is very thin walls for buried application (2 3/4" is the smallest!) and wire mesh reinforcing. Design is by yield line analysis for two way panels and they "comply" with the ACI 318 "building code" only. Does Crack control requirements of 10.6.4 apply and would 10.6.5 not imply that ACI 350 should be used (as these tanks must be watertight)? In my opinion the 350 requirements should be adhered to, minimum 2" cover for all panels, compliance with reduced z values and use of 1.3 durability factor. Any opinion?
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