# US 5,341,616 A · Concrete insert element and concrete structure having at least one concrete insert element

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- Number: US 5,341,616 A
- Document ID: US5341616A
- Status: Granted
- Kind: A
- Application number: 07/702,264
- Filed: 1991-05-17
- Granted: 1994-08-30
- Earliest claimed: 1991-02-02
- Assignees: Max Frank GmbH & Co. KG
- Inventors: Ludwig Penzkofer
- Web page: https://patentgrep.com/patent/US5341616A

## CPC

- E04G 21/125: {Reinforcement continuity box}
- E04C 5/015: {Anti-corrosion coatings or treating compositions, e.g. containing waterglass or based on another metal (coating of discrete reinforcing elements C04B20/10)}
- Y10T 428/12757: Fe
- E04G: SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04C: STRUCTURAL ELEMENTS; BUILDING MATERIALS (for bridges E01D; specially designed for insulation or other protection E04B; elements used as building aids E04G; for mining E21; for tunnels E21D; structural elements with broader range of application than for building engineering F16, particularly F16S)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A concrete structure having at least one concrete insert element is disclosed. The insert element has a surface with a layer of aluminum or aluminum alloy and, upon setting of the concrete, the layer of aluminum or aluminum alloy reacts at least partially with the free lime and oxygen in the concrete to form calcium aluminate, thus providing a particularly intimate and firm bond between the insert element and the concrete.

## Claims

### Claim 1

Concrete structure having at least one concrete insert element, which in at least a partial region is fabricated of steel and there has at least one surface embedded in concrete or cement of the concrete structure (9, 10), characterized in that the insert element (2) is provided on this surface with a layer (12) of aluminum or of an aluminum alloy, and in that this layer, upon setting of the concrete, has reacted at least partially with the free lime and oxygen to form calcium aluminate, specifically for obtaining a particularly intimate and firm bond between the concrete insert element and the concrete of the concrete structure (9, 10).

### Claim 2 (depends on 1)

Concrete structure according to claim 1, characterized in that the layer of aluminum or aluminum alloy has a thickness (d) which is selected so that after embedding of the insert element (2) in the concrete or cement and after setting of the concrete, virtually all the material of the layer (12) of aluminum or of an aluminum alloy has reacted with the free lime of the concrete or cement and with oxygen to form a calcium aluminate, specifically, to at most a small residual thickness.

### Claim 3 (depends on 1)

Concrete structure according to claim 1, characterized in that the thickness of the layer (12) of aluminum or of aluminum alloy amounts to under 200 micrometers.

### Claim 4 (depends on 3)

Concrete structure according to claim 3, characterized in that the thickness of the layer of aluminum or aluminum alloy lies in the order of magnitude of 20 micrometers.

### Claim 5 (depends on 3)

Concrete structure according to claim 3, characterized in that the thickness of the layer (12) of aluminum or of the aluminum alloy lies in the region of between about 10-40 micrometers.

### Claim 6 (depends on 5)

Concrete structure according to claim 5, characterized in that the thickness of the layer of aluminum or of the aluminum alloy amounts to approximately 20-25 micrometers.

### Claim 7 (depends on 1)

Concrete structure according to claim 1, characterized in that the aluminum alloy forming the layer contains zinc, the percentage of aluminum being greater than 50%, preferably lying between approximately 55-70%.

### Claim 8 (depends on 7)

Concrete insert element according to claim 7, characterized in that the aluminum alloy forming the layer contains approximately 55% aluminum and approximately 43% zinc.

### Claim 9 (depends on 8)

Concrete insert element according to claim 8, characterized in that the aluminum alloy contains a percentage of approximately 2% silicon.

### Claim 10 (depends on 8)

Concrete structure according to claim 8, characterized in that the aluminum alloy contains approximately 1.6% silicon.