This research explores the structural properties of fresh concrete. The work is relevant wherever green, or uncured, concrete must be load-bearing. In traditional concreting, rigid forms mold and protect young concrete, and these forms are not removed until the maturing material has developed considerable load-bearing strength. Conversely, an automated construction technology under development at the University of Southern California, proposes to rapidly fabricate civil structures additively — layering continuous ribbons of fresh unconfined concrete — the freshly layered concrete must be load-bearing immediately upon placement. This is an unprecedented structural requirement, and little has been done to substantiate uncured concrete in such a load-bearing capacity. With emphasis on expedient experimental techniques, early maturity, and time-dependent constitutive modeling, this research develops the engineering necessary to erect these structures safely.

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