TWO-LAYER CONCRETE PAVEMENT DEVICE AND PAVEMENT METHOD USING NORMAL CONCRETE AND HIGH-PERPORMANCE CONCRETE

• US 20160340840A1
• Filed: 12/04/2014
• Published: 11/24/2016
• Est. Priority Date: 12/10/2013
• Status: Active Grant

• Current Assignee: Kangwon National University Industry Cooperation Foundation
• Original Assignee: Kangwon National University Industry Cooperation Foundation
• Inventors: YUN, Kyong Ku
• Granted Patent: US 10,000,896 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: C04B 14/106 Kaolin
• CPC Class Codes: C04B 14/308 Iron oxide
• CPC Class Codes: C04B 18/08 Flue dust , i.e. fly ash
• CPC Class Codes: C04B 18/141 Slags
• CPC Class Codes: C04B 18/146 Silica fume
• CPC Class Codes: C04B 2111/00612 as one or more layers of a layered structure
• CPC Class Codes: C04B 28/02 containing hydraulic cements other than calcium sulfates
• CPC Class Codes: C04B 38/10 by using foaming agents C04B38/02 takes precedenceor by using mechanical means, e.g. adding preformed foam
• CPC Class Codes: E01C 19/002 Apparatus for preparing and placing the materials and for consolidating or finishing the paving
• CPC Class Codes: E01C 19/30 Tamping or vibrating apparatus other than rollers ; Devices for ramming individual paving elementsE01C19/41, E01C19/43, E01C19/4833, E01C19/488, E01C19/4886, E01C19/52, E01C21/00, E01C23/02, E01C23/04 take precedence; vibrated depositing devices E01C19/12; tamping or vibrating rollers E01C19/28; portable percussion tools B25D; tamping or vibrating soil E02D3/046
• CPC Class Codes: E01C 19/42 Machines for imparting a smooth finish to freshly-laid paving courses other than by rolling, tamping or vibrating for distributing only E01C19/12; hand-actuated smoothing tools E01C19/44
• CPC Class Codes: E01C 19/4833 with tamping or vibrating means for consolidating or finishing, e.g. immersed vibrators, with or without non-vibratory or non-percussive pressing or smoothing means E01C19/4806, E01C19/4886 take precedence; combined with rollers E01C19/488
• CPC Class Codes: E01C 19/4853 Apparatus designed for railless operation, e.g. crawler-mounted, provided with portable trackway arrangements
• CPC Class Codes: E01C 19/486 with non-vibratory or non-percussive pressing or smoothing means; with supplemental elements penetrating the paving to work the material thereof
• CPC Class Codes: E01C 19/4893 Apparatus designed for railless operation
• CPC Class Codes: E01C 7/14 Concrete paving from concrete prepared in situ E01C7/12; small individual units from concrete cast in situ E01C9/001; arrangement or construction of joints E01C11/04; reinforcements E01C11/18
• CPC Class Codes: E04G 2021/049 concrete mixing nozzles specially adapted for conveying devices
• CPC Class Codes: Y02A 30/60 Planning or developing urban green infrastructure
• CPC Class Codes: Y02W 30/91 Use of waste materials as fillers for mortars or concrete

Abstract

The present invention relates to a method for reinforcing an assembly-type slope by using high-performance shotcrete and a reinforcing member, the method, after producing, at a batch plant, normal concrete having a compressive strength of 21-30 MPa and transporting the normal concrete to a construction site: forms a normal-strength shotcrete by mixing either fly ash or slag fine powder or low-grade mixed material in which fly ash or slag fine powder is mixed, in an increased fluidity state by mixing 20-40% of bubbles of the total volume; forms a high-performance shotcrete by mixing silica fumes and metakaolin or high-grade mixed material in which either silica fumes or metakaolin are mixed; and forms a color shotcrete by mixing coloring materials of iron oxide or carbon black, so as to sequentially construct an inner layer section, an outer layer section, and a surface layer section on the slope.

Claims

1. A two-layer concrete pavement device using normal concrete and high-performance concrete, comprising:

a usual slip form paver configured to form a lower layer of a two-layer concrete pavement by using a normal concrete with a slump of 40 mm or below;

a high-performance concrete forming unit provided at one side of the slip form paver to form high-performance concrete by mixing the normal concrete with bubble slurry in which bubbles and a mixed material are mixed;

a high-performance concrete discharging unit configured to discharge the high-performance concrete to an upper surface of the lower layer of the two-layer concrete pavement, while dissipating the bubbles included in the high-performance concrete, to form an upper layer of the two-layer concrete pavement; and

a vibrating worktable installed at the slip form paver to tamp and finish an upper surface of the upper layer of the two-layer concrete pavement.

2. The two-layer concrete pavement device using normal concrete and high-performance concrete of claim 1, wherein the high-performance concrete forming unit includes:

a hopper configured to supply the normal concrete to a front end of the slip form paver;

a connection member configured to connect the hopper to the high-performance concrete discharging unit and guide movement of the normal concrete supplied to the hopper;

bubble slurry mixed with the normal concrete to increase a slump of the normal concrete moved to the connection member; and

a screw configured to mix the normal concrete with the bubble slurry to form high-performance concrete.

3. The two-layer concrete pavement device using normal concrete and high-performance concrete of claim 1, wherein the high-performance concrete forming unit includes:

a shaft configured to rotate by means of a power of a motor in a concrete mixer truck to which the normal concrete is put; and

a mixing member formed at the shaft to have at least one stage in a radial direction to mix the normal concrete with the bubble slurry while rotating in a rotation direction of the shaft.

4. The two-layer concrete pavement device using normal concrete and high-performance concrete of claim 1, wherein the mixed material is obtained by mixing at least one of silica fume, metakaolin, fly ash, blast furnace slag fine powder, latex, polymer and coloring.

5. The two-layer concrete pavement device using normal concrete and high-performance concrete of claim 1, wherein the high-performance concrete discharging unit includes:

a discharge guide member configured to receive the high-performance concrete and discharge the high-performance concrete to the upper surface of the lower layer; and

an air supply hole formed through the discharge guide member to reduce an air volume by dissipating bubbles included in the high-performance concrete supplied to the discharge guide member so as to supply a high-pressure air of 5 atmospheres or above.

6. The two-layer concrete pavement device using normal concrete and high-performance concrete of claim 1, wherein the vibrating worktable is formed integrally with the usual slip form paver or integrally with another slip form paver.

7. A two-layer concrete pavement method using normal concrete and high-performance concrete, comprising:

forming a lower layer of a two-layer concrete pavement by pressing a normal concrete with a slump of 40 mm or below using a slip form paver;

forming high-performance concrete by mixing the normal concrete with bubble slurry in which bubbles and a mixed material are mixed;

discharging the high-performance concrete to an upper surface of the lower layer of the two-layer concrete pavement in a smaller thickness than the lower layer of the two-layer concrete pavement, while dissipating the bubbles included in the high-performance concrete, to form an upper layer of the two-layer concrete pavement; and

tamping and finishing an upper surface of the upper layer of the two-layer concrete pavement by using a vibrating worktable.

8. The two-layer concrete pavement method using normal concrete and high-performance concrete of claim 7, wherein the forming of high-performance concrete is performed by:

a hopper configured to supply the normal concrete to a front end of the slip form paver;

a connection member configured to connect the hopper to the high-performance concrete discharging unit and guide movement of the normal concrete supplied to the hopper;

bubble slurry mixed with the normal concrete to increase a slump of the normal concrete moved to the connection member; and

a screw configured to mix the normal concrete with the bubble slurry to form high-performance concrete.

9. The two-layer concrete pavement method using normal concrete and high-performance concrete of claim 7, wherein the forming of high-performance concrete is performed by:

a shaft configured to rotate by means of a power of a motor in a concrete mixer truck to which the normal concrete is put; and

a mixing member formed at the shaft to have at least one stage in a radial direction to mix the normal concrete with the bubble slurry while rotating in a rotation direction of the shaft.

10. The two-layer concrete pavement method using normal concrete and high-performance concrete of claim 7, wherein the mixed material is obtained by mixing at least one of silica fume, metakaolin, fly ash, blast furnace slag fine powder, latex, polymer and coloring.

11. The two-layer concrete pavement method using normal concrete and high-performance concrete of claim 7, wherein the discharging of the high-performance concrete is performed by:

a discharge guide member configured to receive the high-performance concrete and discharge the high-performance concrete to the upper surface of the lower layer; and

an air supply hole formed through the discharge guide member to reduce an air volume by dissipating bubbles included in the high-performance concrete supplied to the discharge guide member so as to supply a high-pressure air of 5 atmospheres or above.

12. The two-layer concrete pavement method using normal concrete and high-performance concrete of claim 7, wherein the vibrating worktable is formed integrally with the usual slip form paver or integrally with another slip form paver.