US develops 3D-printed concrete substitute for rapid construction

Researchers at Oregon State University have developed a sustainable, clay-based 3D-printable construction material designed to address both environmental and speed challenges in building. Traditional cement production is a major contributor to global CO2 emissions and requires a lengthy curing time of up to 28 days. The new material uses frontal polymerization with an acrylamide-based binder, allowing it to cure instantly as it is printed. This rapid curing enables the construction of multilayer walls and freestanding structures immediately, reaching residential concrete strength (over 17 megapascals) within three days—significantly faster than conventional concrete. The eco-friendly composite is made primarily from soil, hemp fibers, sand, and biochar, a carbon-rich byproduct that helps sequester carbon, thereby reducing the carbon footprint compared to traditional cement. This innovation is particularly promising for rapid shelter construction in disaster-stricken areas, where speed and sustainability are critical. While current costs are higher than standard concrete, the research team aims to reduce expenses and