New Test Method for Cylindrical Concrete Manholes by the Negative Air Pressure (Vacuum) Test Post Backfill
1. Scope
1. Scope
1.1 This practice covers procedures for testing precast concrete manhole sections when using the vacuum test method to demonstrate the integrity of the installed materials and the construction procedures. This test method is used for testing concrete manhole sections utilizing mortar, mastic or gasketed joints.
1.2 This practice is intended to be used as a test to enable the installer to demonstrate the condition of the concrete manholes post backfill. Its purpose is to avoid overloading the manhole with pressure in excedd of 10 in. [33.86 Kpa]
Keywords
post backfill, standpipe, water level, pipe stub
Rationale
The proposed specification is being placed for subcommittee ballot as a result of a task group assignment to develop a new standard for Vacuum Testing after Backfill; to help eliminate issues with the current specification C1244/C1244M which is designated for use prior to backfill.
