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AssigneeThe Regents of the University of Michigan
InventorsDaniel G. Soltan, Victor C. Li
Estimating the term…
Printable cementitious compositions for additive manufacturing are provided, that have a fresh state and a hardened state. In fresh state, the composition is flowable and extrudable in the additive manufacturing process. In the hardened state, the composition exhibits strain hardening. In one variation, the strain hardening is represented by a uniaxial tensile strength of ≥about 2.5 MPa, a tensile strain capacity of ≥about 1%, and a compressive strength at 100 hours of ≥about 20 MPa. In other variations, the composition includes Portland cement, a calcium aluminate cement, a fine aggregate, water, a high range water reducing agent (HRWRA), and a polymeric fiber, as well as one or more optional components selected from: fly ash, silica flour, microsilica, attapulgite nanoclay, and/or hydroxypropylmethyl cellulose (HPMC). Methods of additive manufacturing with such compositions are also provided.
A printable cementitious composition for additive manufacturing, the composition having a fresh state and a hardened state, wherein in the fresh state the composition is thixotropic, flowable and extrudable in the additive manufacturing process and has a flowability factor of greater than or equal to about 1.1 to less than or equal to about 1.7 and in the hardened state, the composition exhibits strain hardening and has a uniaxial tensile strength of greater than or equal to about 2.5 MPa, a tensile strain capacity of greater than or equal to about 2.5%, and a compressive strength at 100 hours of greater than or equal to about 20 MPa, wherein the composition comprises Portland cement, a calcium aluminate cement, a fine aggregate, water, a high range water reducing agent (HRWRA), a polymeric fiber, and the printable cementitious composition further comprises:
A method of additive manufacturing comprising:
Dependencies are inferred from the claim text.