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 conductive carbon particles comprising from at least about one to twenty percent (1-20%) of the concrete mixture by weight and 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 method of making a concrete mixture, comprising:
blending conductive carbon particles and aggregate to a form a dry mix;
adding cement, water, and magnetic material to the dry mix to form a wet mix;
adding metallic conductive material to the wet mix; and
mixing the conductive material and the wet mix to form a conductive concrete material,
wherein the conductive carbon particles comprise from at least about one to twenty percent (1-20%) of the concrete mixture by weight and the magnetic material comprises from about fifteen to fifty percent (15-50%) of the concrete mixture by weight.
9. The method as recited in claim 8 , wherein the metallic conductive material comprises steel fibers.
10. The method 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 method as recited in claim 8 , wherein the magnetic material comprises taconite aggregate.
12. The method as recited in claim 8 , wherein blending conductive carbon particles and aggregate to form a dry mix further comprises blending conductive carbon particles, graphite powder, and aggregate to form a dry mix.
13. The concrete mixture as recited in claim 8 , wherein adding cement, water, and magnetic material to the dry mix to form a wet mix further comprises adding cement, water, magnetic material, and a supplementary cementitious material (SCM) to the dry mix to form a wet mix.
14. A concrete mixture, comprising:
cement;
aggregate;
water;
metallic conductive material;
conductive carbon particles; and
magnetic material.
15. The concrete mixture as recited in claim 14 , wherein the metallic conductive material comprises steel fibers.
16. The concrete mixture as recited in claim 14 , wherein the magnetic material comprises at least one of taconite, magnetite, kamacite, taenite, titanohematite, pyrrhotite, ilmenite, or titanomagnetite.
17. The concrete mixture as recited in claim 14 , wherein the magnetic material comprises taconite aggregate.
18. The concrete mixture as recited in claim 14 , further comprising graphite powder.
19. The concrete mixture as recited in claim 14 , further comprising a supplementary cementitious material (SCM).