Abstract: A novel cement and concrete mixture is disclosed, which incorporates the spent catalysts from hydrocracking gasoline in partial substitution for the cementing agent.

Abstract: A threaded fastener with a central portion separating wider flanges with straight polygonal sides and straight normal flange faces embedded in a plastic. One flange face is flush with the surface of the embedding body to provide a load bearing surface preventing compression of the body.

Abstract: An alignment bracket used in combination with an extendible pole having a hooked end provides lateral and rotational alignment for the interengagement of precast concrete sections of underground concrete structures during their construction, eliminating the need for workmen to enter an excavation for this purpose. The bracket is moved by the pole after each section is positioned to provide alignment for the next section. During alignment the sections can be moved both rotationally and laterally by workmen applying force on the bracket with the pole.