# US 4,398,842 A · Method of overlay and sandwich formation of pervious concrete

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 4,398,842 A
- Document ID: US4398842A
- Status: Granted
- Kind: A
- Application number: 06/220,519
- Filed: 1980-12-29
- Granted: 1983-08-16
- Earliest claimed: 1980-12-29
- Inventors: Harry Hodson
- Web page: https://patentgrep.com/patent/US4398842A

## CPC

- E01C 7/147: {Repairing concrete pavings, e.g. joining cracked road sections by dowels, applying a new concrete covering (applying thin surface layers with other binder E01C7/35; repairing pavings in general E01C11/005; roughening by means of tools E01C11/24)}
- E01C 11/226: {Coherent pavings}
- Y02A 30/30: in transportation, e.g. on roads, waterways or railways
- E01C: CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR (forming roads or like surfaces by compacting or grading snow or ice E01H)
- Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE

## Abstract

A method of overlay and sandwich formation of a combination of pervious concrete with itself and/or standard cement concrete wherein the existing surface is cleaned either mechanically or chemically, a coating of cement and water mortar, mixed in a high energy/shear type mixer, is then applied, and pervious concrete is directly applied to any required thickness, which results in a complete bonding between the overlay and the original pavement. To apply pervious concrete to reinforced concrete slab construction, in cases where lateral water movement may be undesirable, a similar procedure is used after transverse penetration of the reinforced slab with holes spaced so as to clear reinforcing steel and of sufficient size and area to permit the drainage of the combined slab. These holes will be filled with pervious concrete during the overlay procedure.

## Claims

### Claim 1

A method of producing a self-adhering pervious concrete product for paving of the type which allows fluids to pass therethrough in combination with an existing strata, said method comprising the steps of:
(a) cleaning the surface of the existing strata;
(b) supplying a predetermined quantity of cement;
(c) supplying a predetermined quantity of water;
(d) mixing together said predetermined quantities of cement and water to form a cementitious material utilizing high energy techniques, at least until said resulting cementitious material establishes a substantially consistent viscosity;
(e) supplying a quantity of aggregate;
(f) mixing said quantity of aggregate with said cementitious material to form said pervious concrete product;
(g) coating the surface with said pervious concrete product;
(h) directly applying pervious concrete product to the required thickness, which results in a complete bonding with the existing strata.

### Claim 2 (depends on 1)

A method as in claim 1 further comprising the step of:
(i) penetration of the existing strata slab drain apertures sufficient size and area to permit the drainage of the combined slab to prevent lateral water movement of the interface of the combined slab.

### Claim 3 (depends on 2)

A method as in claim 2 further including filling said drain apertures with pervious concrete during the overlay procedure.

### Claim 4 (depends on 1)

A method as in claim 1 wherein sandwich slabs either of pervious concrete enclosing normal monolithic concrete, or the reverse are constructed.

### Claim 5 (depends on 1)

A method as in claim 1 comprising cleaning the surface of the existing strata mechanically.

### Claim 6 (depends on 1)

A method as in claim 1 comprising cleaning the surface of the existing strata chemically.