The availability of low-cost, high performance computers that are capable of real-time 3-D graphic simulation has lead to a plethora of applications in the construction industry. This technology is particularly beneficial in the design and Simulation Of automated construction systems. The expense of physically constructing and implementing a full-scale prototype automated construction systems has been a prohibitive factor in significant progress in this area. computer hardware and software technologies that call perform real-time 3-D graphical Simulation and Visualization afford a tool that allows investigation and visual demonstration of conceptual and prototype designs, without the related expense of physical prototype construction. This paper overviews the application of 3-D graphical simulation and Visualization and construction automation research and development and presents a Study to apply 3-D graphical simulation in the development of a prototype automated push-up gantry robot system for automated construction. The investigation demonstrates the use of 3-D Graphical simulation as both a communication and Investigative tool for proof-of-concept studies ill the development of automated construction systems to demonstrate the feasibility of the push-up gantry automated construction system concept.