Method of making concrete electrically conductive for electromagnetic shielding purposes

• Main Author: MCCORMACK; RAY G
• Format: Patent
• Language: English
• Published: 13.09.1994
• Edition: 5
• Subjects: ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; LIME, MAGNESIA; METALLURGY; PERFORMING OPERATIONS; REFRACTORIES; SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS, SLAG, OR MIXTURESCONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER; SLAG; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ARTCOLLECTIONS [XRACs] AND DIGESTS; TRANSPORTING; TREATMENT OF NATURAL STONE; WORKING CEMENT, CLAY, OR STONE

Method and apparatus for making electrically conductive concrete articles used for electromagnetic shielding, the invention also includes the articles of manufacture formed according to the method. Concrete articles formed according to the method of the invention are reinforced with magnetized metallic fibers, preferably steel fibers, a substantial portion of the fibers contacting nearby fibers to provide electrical continuity through the article. Contact between fibers is enhanced according to the invention by vibration of the concrete/fiber mix during forming of the electrically conductive concrete article.