Does anyone out there have ever pumped crete in a culvert that is about 100 ft long and 16 in diameter and only have one end that can be accessed for the job. No holes can dug to get to the pipe nor any vent holes. We can get a wire thru the culvert to attach the hose to pull it thru. But how can we be sure that the pipe will be completely filled and not get concrete backing up and jamming the hose. Any help would be gratefull.

it has to be filled with 25 mpa concrete and it appears to be fairly flat