Opus Luteum: Incorporating a Third Dimension to Tilt-up Concrete Wall Panels

Abstract

Tilt-up concrete wall construction is a casting alternative to cast-in-place and precast systems. The panels are cast horizontally on site and tilted up to a vertical position, forming strong building envelopes. Some remarkable features of the tilt-up system are the durability, speed, efficiency, and cost-effectiveness of the process compared to other conventional construction systems. Tilt-up construction is characterized by the simplicity of the casting method; using a flat floor slab as formwork on site, the outcome is typically flat panels. This article showcases the design and construction of tilt-up concrete panels that incorporate a third dimension to the typical flat panel using soil as formwork. Earth, the most primitive and basic construction material, can support an efficient mold- making system that is environmentally sensitive. This innovative approach utilizes an accessible, economical, and reusable local material that allows the configuration of molds with double-curvature surfaces that can provide additional structural rigidity and stability to the concrete panels. The production of concrete building envelopes with complex geometries opens a range of design possibilities for load-bearing building envelopes with simple and affordable means.