Is it possible to place high density concrete by pumping? If so, are there any special methods or precautions needed?
High density concretes, such as those used for shielding, can be placed by pumping if the area into which the concrete is introduced is always visible to the workmen. If it is proportioned properly such concrete is actually easier to pump than normal weight concrete and it can be pumped at relatively low slumps. Ferrophosphorus concrete, however, is difficult to pump because of its high porosity.