US 11,981,603 B2
Self-reinforced cementitious composite compositions for building-scale three dimensional (3D) printing
Daniel G. Soltan, Ann Arbor, MI (US); and Victor C. Li, Ann Arbor, MI (US)
Assigned to THE REGENTS OF THE UNIVERSITY OF MICHIGAN, Ann Arbor, MI (US)
Appl. No. 16/760,706
Filed by THE REGENTS OF THE UNIVERSITY OF MICHIGAN, Ann Arbor, MI (US)
PCT Filed Oct. 31, 2018, PCT No. PCT/US2018/058480
§ 371(c)(1), (2) Date Apr. 30, 2020,
PCT Pub. No. WO2019/089771, PCT Pub. Date May 9, 2019.
Claims priority of provisional application 62/579,567, filed on Oct. 31, 2017.
Prior Publication US 2020/0331165 A1, Oct. 22, 2020
Int. Cl. B28B 1/00 (2006.01); B28B 1/52 (2006.01); B33Y 10/00 (2015.01); B33Y 70/10 (2020.01); B33Y 80/00 (2015.01); C04B 14/06 (2006.01); C04B 14/10 (2006.01); C04B 16/02 (2006.01); C04B 16/06 (2006.01); C04B 20/00 (2006.01); C04B 28/02 (2006.01); C04B 28/04 (2006.01); C04B 28/06 (2006.01); C04B 103/30 (2006.01); C04B 111/00 (2006.01); C04B 111/50 (2006.01)
CPC C04B 28/02 (2013.01) [B28B 1/001 (2013.01); B28B 1/525 (2013.01); B33Y 10/00 (2014.12); B33Y 70/10 (2020.01); B33Y 80/00 (2014.12); C04B 14/062 (2013.01); C04B 14/102 (2013.01); C04B 16/02 (2013.01); C04B 16/0641 (2013.01); C04B 20/008 (2013.01); C04B 28/04 (2013.01); C04B 28/06 (2013.01); C04B 2103/302 (2013.01); C04B 2111/00129 (2013.01); C04B 2111/00181 (2013.01); C04B 2111/50 (2013.01)] 10 Claims
 
1. 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:
microsilica at greater than or equal to about 2 mass % to less than or equal to about 30 mass % of the total mass of the composition,
silica flour present at greater than or equal to about 0.1 mass % to less than or equal to about 5 mass % of the total mass of the composition, and
attapulgite nanoclay greater than or equal to 0.5 mass % to less than or equal to about 3 mass % of the total mass of the composition.