3D printable cementitious ink including electromagnetic pulse resistant binders
An electromagnetic interference (EMI) resistant cementitious ink comprising a hydraulic cement, calcium carbonate, silica sand, taconite material, and a conductive material. A ratio of the silica sand to the taconite material is 1:1. In some embodiments, the taconite material includes taconite powder and fine taconite aggregate having a ratio of 1:1. In some embodiments, the conductive material includes carbon-based nanoparticles in solution. In further embodiments, the EMI-resistant cementitious ink has a shielding effectiveness in accordance with ASTM D4935-18 of at least 4.0 dB.
1. An electromagnetic interference (EMI) resistant cementitious ink comprising:
a hydraulic cement;
calcium carbonate;
silica sand;
taconite material; and
a conductive material;
wherein a ratio of the silica sand to the taconite material is 1:1;
wherein the taconite material includes taconite powder and fine taconite aggregate; and wherein the taconite powder has a particle size range with a d 10 and d 90 of about 6 μm and about 80 μm, respectively, and wherein the fine taconite aggregate has a particle size range with a d 10 and d 90 of about 242 μm and about 2,700 μm, respectively.
2. The EMI-resistant cementitious ink of claim 1 , wherein a ratio of taconite powder to fine taconite aggregate is 1:1.
3. The EMI-resistant cementitious ink of claim 1 , wherein the taconite material is provided in a range of about 30% to about 35% by weight.
4. The EMI-resistant cementitious ink of claim 3 , wherein the taconite material includes about 15% to about 17.5% by weight of taconite powder and about 15% to about 17.5% by weight of fine taconite aggregate.
5. The EMI-resistant cementitious ink of claim 1 , wherein the silica sand is provided in a range of about 25% to about 30% by weight.
6. The EMI-resistant cementitious ink of claim 1 , wherein the conductive material comprises carbon-based nanoparticles in solution.
7. The EMI-resistant cementitious ink of claim 6 , wherein the carbon-based nanoparticles comprises one or more of carbon nanotube particles, graphite powder, micro-steel fibers, and carbon nanofiber particles.
8. The EMI-resistant cementitious ink of claim 1 , wherein the EMI-resistant cementitious ink has a shielding effectiveness in accordance with ASTM D4395-18 of at least about 4.0 dB.