An industrial and consumer 3D printing equipment developer reports completion of the world’s largest permitted project of its kind to date: A three-bedroom home whose foundation, exterior walls and interior partitions were printed in 48 hours over an eight-day window with temperatures in the 30s at a cost below $6,000. SQ4D Inc. deployed its Autonomous Robotic Construction System (ARCS) for the 1,900-sq.-ft., Calvern, N.Y. project.
|SQ$D kept the ARCS feed rate at ~550 ipm for the project—under 50 percent of the maximum speed of 1,200 ipm as it was their first full-sized house printing. Previously, it completed a 500-sq.-ft. home in under 12 hours.|
ARCS is a gantry-style 3D printer whose shuttle guides a mix hose and nozzle along lateral and longitudinal paths, placing low slump mixes in beads or layers approximately 0.75-in. thick and 1.5-in. wide. Powered by patent-pending technology, the digitally driven system reduces labor to as few as three crew members by consolidating upward of 20 manual, labor-intensive processes behind the home structure and enclosure. Developers anticipate future print cycles to be half those logged in pilot projects. Completion of the world’s largest permitted 3D printed home, they contend, supports the SQ4D tagline: “Changing the way the world is built.” — SQ4D Inc., Patchogue, N.Y., 844/773-3669; www.sq4d.com
ASTM C01/09 ADDITIVE CONSTRUCTION SYMPOSIUM
ASTM International Committees C09 on Concrete and Concrete Aggregates and C01 on Cement are accepting candidate paper abstracts for Symposium on Standards Development for Cement and Concrete for Use in Additive Construction. The December 7-8 program will take place at the Renaissance Orlando at SeaWorld in conjunction with semiannual committee meetings.
Co-chairing the symposium are National Institute of Standards and Technology’s Scott Jones and Army Corps of Engineers’ Eric Kreiger. Along with other organizers, they aim to examine test methods for additive construction, or 3D-printed concrete or mortar, potentially standardized through ASTM committees. Among target paper or presentation topics are measurement of early-age material properties (prior to initial setting); rheology (viscosity and yield stress); setting time; shape stability; measurement of hardened properties; compressive, bending and tensile strengths; durability; structural performance measurement; and, reinforcement techniques.
Authors must submit 250- to 300-word abstracts through a platform at www.astm.org/C01C09SymposiumCFPDec2020. Technical inquiries can be directed to Scott Jones, [email protected], or Eric Kreiger, [email protected]ce.arm.mil.