The walls are used to enclose both an exhaust air and supply air duct for a roadway tunnel. The structure is located in Massachusetts. The drawings do not have nay specifications on them and no book spec is available. I have attached a pdf of one of the...
I am performing a study on a building built in 1960 and the drawings call out walls that are constructed of 4" pneumatic mortar. Visually it looks like plain old concrete but don't know anything else about the material.
