초록 ▼

A new castable steel fiber reinforced concrete composition is described composed of Portland Cement, fly ash, fine aggregate, gravel or crushed stone, water, high range superplasticizing water-reducing admixture, and steel fibers. The concrete may be mixed in conventional mixers and cast in open top

A new castable steel fiber reinforced concrete composition is described composed of Portland Cement, fly ash, fine aggregate, gravel or crushed stone, water, high range superplasticizing water-reducing admixture, and steel fibers. The concrete may be mixed in conventional mixers and cast in open top molds to form modular panels for use in the construction of security vaults. The cast panels have outstanding engineering properties resistant to burglarious attack measures such that multi-paneled vault walls resist burglarious attack as outlined in Underwriters Laboratories Standard No. 608 in thicknesses of 8 inches for 1 hour and 11 inches for 2 hours. New casting procedures for the concrete and new vault construction procedures using modular panels cast from the concrete also are described.

대표청구항 ▼

1. A burglar resistant castable concrete panel construction for assembly into an integrated secure vault, wherein the improvement comprises: a concrete composition which can be fully consolidated when cast with water to cement ratios less than 0.30 and steel fiber content of 7.21% to 7.73% by wei

1. A burglar resistant castable concrete panel construction for assembly into an integrated secure vault, wherein the improvement comprises: a concrete composition which can be fully consolidated when cast with water to cement ratios less than 0.30 and steel fiber content of 7.21% to 7.73% by weight, consisting essentially of: [TABLE] ______________________________________ Constituents Weight % ______________________________________ Portland Cement wherein said 18.88 to 19.81 cement is selected from the group consisting of Type I and Type III Portland Cement; Fly Ash wherein said fly ash is 1.37 to 1.45 selected from the group consisting of Glass F and Class C fly ash; Fine Aggregate (SSD); 39.12 to 40.86 Gravel wherein said gravel is 25.12 to 26.53 selected from the group consisting of No. 8 gravel and crushed stone, (SSD); Water; 4.81 to 5.15 Melamine Superplasicizing Water- 0.96 to 1.04 Reducing Admixture; and, Steel fibers; 7.21 to 7.73. ______________________________________ 2. The modular panel construction according to claim 1 wherein the steel fibers have the nominal dimensions of 0.016 inches diameter×0.75 inches long±1/4 inch. 3. The modular panel construction according to claim 1 wherein fused Al 2 O 3 is substituted for the Gravel constituent. 4. The modular panel construction defined in claim 2 in which the concrete composition has such resistance to impact hammer attack that no such panel in a vault wall of an integrated vault formed of multiple such panels can have chunks of the concrete removed to penetrate said panel to form a 96 square inch attack-available opening in such vault wall panel; and in which such 96 square inch opening cannot be formed in an 8 inch thick vault wall panel in one hour and in an 11 inch thick vault wall panel in two hours by impact hammer attack to reduce the concrete to powder. 5. The modular panel construction defined in claim 2 in which attack by an oxy-acetylene torch has little effect in penetrating a vault wall panel even when a fluxing rod is used in conjunction with the torch. 6. The modular panel construction defined in claim 2 in which a plurality of layers of 4 inch spaced re-bar mesh mats formed of 5/8 inch diameter steel bars are located within the cast steel fiber reinforced concrete; and in which a vault wall panel resists formation of a 96 square inch attack-available opening through the panel by diamond-core drill attack in an 8 inch thick panel in one hour and in an 11 inch thick panel in two hours. 7. The modular panel construction defined in claim 2 in which spaced complementary overlap formations are molded in surfaces of each panel adapted for complementary engagement with overlap formations in other panels when multiple panels are assembled to construct a vault, to thereby provide overlapped joints between adjacent vault wall panels. 8. The modular panel construction defined in claim 2 in which connector means are cast in said panels at spaced locations accessible at panel inner vault chamber surfaces for connection with panel tie-lock means spanning joints within the vault between adjacent panels of multiple panels assembled to construct an integrated vault. 9. The modular panel construction defined in claim 2 in which a manhole opening is molded in one panel of multiple panels adapted to be assembled to construct a vault; in which a manhole plug is provided for closing said manhole opening with lock means engageable within the vault to lock said manhole plug in said manhole opening, whereby said manhole plug may be destroyed to gain access to a lock-out vault for correcting the lock-out status and for replacement of a new plug in said manhole opening and locking said new plug in closure position. 10. The method of mixing and casting a metal fiber reinforced concrete composition which can be fully consolidated when cast with water to cement ratios less than 0.30 and steel fiber content of 7.21 to 7.73% by weight, consisting essentially of: [TABLE] ______________________________________ Concrete Constituents *] [lb/yd 3 ]