Abstract: A plastic slump cone includes a unitary frusto-conical mold formed of a synthetic resin defining an open base at one axial end and a smaller open top at an opposite axial end for receiving a sample of freshly mixed concrete, in use. A pair of foot pieces formed of synthetic resin are secured to the mold and extend radially outwardly therefrom at the base on opposite sides thereof for holding the mold firmly in place while filling with a sample of concrete. A pair of handles formed of synthetic resin are secured to the mold and extend radially outwardly therefrom intermediate the base and the top and opposite sides thereof for lifting the mold when filled with a sample of concrete.

Abstract: A mold for forming concrete having a bottom, a pair of side walls and a pair of end walls, all of plastic, and with the side walls and bottom being of integral one-piece construction and hinged together by living hinges defined by reduced thickness of the plastic panel. The ends walls are shaped with generally U-shaped channels dimensioned to lock onto the ends of the bottom and side walls whereby a watertight concrete mold is formed. The concrete mold is assembled by pivoting the side walls to an upright position relative to the bottom by means of the living hinges and the end walls are then secured to the bottom and side walls. The mold can be disassembled for removal of a formed concrete specimen by removal of the end walls and pivoting the side walls downwardly to a generally coplanar relation with the bottom to expose the test specimen for removal.

Abstract: A lightweight, concrete form having an inner elongate cylindrical member with an internal opening having a cross section to provide the desired shape for a concrete column and a layer of thin stretch film stretched about the inner member to place the inner member in compression and with the ends of the film overlapped for self-adherence.