Abstract: A mold for casting precise 3-inch by 3-inch by 6-inch mortar grout prisms with minimal set-up time may be reusable for each test and may allow testing of, for example, multiple trucks of mortar grout, if required. The mold may include a U-shaped main body, side walls, a lid, and a divider. The main body and the side walls may form an open container into which the divider fits and divides the open container into four equal compartments. The mold may be made of, for example, hard plastic, which can be reused multiple times.