Straub, Lorenz G.Bowers, Charles A.Pilch, Meir2011-06-252011-06-251960-12https://hdl.handle.net/11299/108034Experimental studies were performed on 24-in. and 36-in. concrete culvert pipe to determine the effect of interior surface finishes and joint irregularities on the frictional resistance of the pipe. Cast and vibrated pipe and machine-tamped pipe were used in the tests. The studies are grouped into several more or less related categories.en-USWorking Paper