Patent ID: 8621817

Claim:
A method for casting a vertical structure from a highly thixotropic cementicious material by: a. positioning a vertically oriented backstop on at least one side of said vertical structure to be cast, b. positioning a vertically oriented screed a predetermined space apart from said backstop with a screed face facing said backstop, c. casting said material into a hopper attached to said screed and that feeds said material into a casting area between said face and said backstop, d. liquefying, consolidating and spreading, said material in said casting area, e. shaping the outside face of said material with said screed and a trailing slip form, f. eliminating a seam between said material placed in a present pass with said material placed in any previous adjacent pass with a seam form which is a lateral extension to said screed and said slip form and that overlaps said seam, g. supporting and guiding said screed in a predetermined direction while maintaining a predetermined distance from said backstop, h. completing a pass and repeating the above steps for any successive pass, whereby a wall, column or other vertical structure is cast with said material.