Concrete mix for electromagnetic wave/pulse shielding
View Patent ↗Conductive concrete mixtures are described that are configured to provide EMP shielding and reflect and/or absorb, for instance, EM waves propagating through the conductive concrete mixture. The conductive concrete mixtures include cement, aggregate, water, metallic conductive material, and conductive carbon particles and/or magnetic material. The conductive material may include steel fibers, and the magnetic material may include taconite aggregate. The conductive concrete mixture may also include graphite powder, silica fume, and/or other supplementary cementitious materials (SCM). The conductive carbon particles may comprise from about zero to twenty-five percent (0-25%) of the conductive concrete mixture by weight and/or the magnetic material may comprise from about zero to fifty percent (0-50%) of the conductive concrete mixture by weight.
1. A concrete mixture, comprising:
cement;
aggregate;
water;
metallic conductive material; and
an electromagnetic shielding material comprising at least one of conductive carbon particles comprising from at least five to twenty five percent (5-25%) of the concrete mixture by weight or magnetic material comprising from about fifteen to fifty percent (15-50%) of the concrete mixture by weight.
2. The concrete mixture as recited in claim 1 , wherein the metallic conductive material comprises steel fibers.
3. The concrete mixture as recited in claim 1 , wherein the magnetic material comprises at least one of taconite, magnetite, kamacite, taenite, titanohematite, pyrrhotite, ilmenite, or titanomagnetite.
4. The concrete mixture as recited in claim 1 , wherein the magnetic material comprises taconite aggregate.
5. The concrete mixture as recited in claim 1 , further comprising graphite powder.
6. The concrete mixture as recited in claim 1 , further comprising a supplementary cementitious material (SCM).
7. The concrete mixture as recited in claim 1 , wherein the metallic conductive material comprises from at least about one to twenty-five percent (1-25%) of the concrete mixture by weight.
8. A concrete mixture, comprising:
cement;
aggregate;
water;
metallic conductive material;
conductive carbon particles, the conductive carbon particles comprising from at least five to twenty-five percent (5-25%) of the concrete mixture by weight; and
magnetic material.
9. The concrete mixture as recited in claim 8 , wherein the metallic conductive material comprises steel fibers.
10. The concrete mixture as recited in claim 8 , wherein the magnetic material comprises at least one of taconite, magnetite, kamacite, taenite, titanohematite, pyrrhotite, ilmenite, or titanomagnetite.
11. The concrete mixture as recited in claim 8 , wherein the magnetic material comprises taconite aggregate.
12. The concrete mixture as recited in claim 8 , further comprising graphite powder.
13. The concrete mixture as recited in claim 8 , further comprising a supplementary cementitious material (SCM).
14. The concrete mixture as recited in claim 5 , wherein the conductive carbon particles further comprise conductive carbon particles having a maximum particle size of seven-tenths of a millimeter (0.7 mm) comprising from about one-half to two percent (0.5-2%) of the conductive concrete mixture by weight; conductive carbon particles having a maximum particle size of two millimeters (2 mm) comprising from about two to six percent (2-6%) of the conductive concrete mixture by weight; and conductive carbon particles having a maximum particle size of ten millimeters (10 mm) comprising from about seven to fourteen percent (7-14%) of the conductive concrete mixture by weight; wherein the graphite powder further comprises graphite powder having a maximum particle size of fifteen-one-hundredths of a millimeter (0.15 mm) that comprise from one to one and one-half percent (1-1.5%) of the conductive concrete mixture by weight.
15. A concrete mixture, comprising:
cement;
aggregate;
water;
metallic conductive material; and
an electromagnetic shielding material comprising conductive carbon particles comprising from at least five to twenty-five percent (5-25%) of the concrete mixture by weight and magnetic material comprising from about fifteen to fifty percent (15-50%) of the concrete mixture by weight.