Composition and method for forming a sprayable materials cover

• US 7,284,930 B2
• Filed: 10/20/2003
• Issued: 10/23/2007
• Est. Priority Date: 10/20/2003
• Status: Expired due to Fees

• Current Assignee: CJS Technology
• Original Assignee: CJS Technology
• Inventors: Wu, Yanzhong, Shi, Caijun
• Primary Examiner(s): MARCANTONI, PAUL D
• Application Number:
  US10/689,415
• Publication Number:
  US 20050084334A1
• Time in Patent Office: 1,464 Days
• Field of Search: 405/129.9, 405/129.95, 106/713
• US Class Current: 405/129.1
• CPC Class Codes: B09B 1/004 Covering of dumping sites
• CPC Class Codes: E02B 3/122 Flexible prefabricated covering elements, e.g. mats, strips
• CPC Class Codes: Y02W 30/30 Landfill technologies aiming to mitigate methane emissions

Abstract

An alternative cover for landfill may be formed from a slurry mixture of water, cementitious binder, adhesion enhancing admixture and fiber. These constituents may be mixed and applied to cover landfilled wastes, granular material piles or for soil erosion control. The cover will harden to minimize water infiltration, wind blown dust, odor and affinity to birds, flies and other insects. The water may include tap water, landfill leachate and wastewater. The binder may include Portland cement, blended cement, cement kiln dust, class C fly ash, and/or calcium sulphate hemihydrate. The adhesion enhancing admixture includes water-dispersible polymers. The fibers may comprise shredded paper or wood or plastic fibers.

Claims

1. A bulk material cover, which comprises:

(a) about 30 to about 70 weight percent liquid;

(b) about 5 to about 60 weight percent cementitious material;

(c) about 0.1 to 5 weight percent water-dispersible polymer comprising a member selected from the group consisting of water-based paint and paint sludge;

(d) up to about 60 weight percent inert filler; and

(e) up to about 20 weight percent fiber, wherein the indicated weight percents are based on total weight of the material.

2. The cover according to claim 1, wherein the liquid is selected from the group consisting of landfill leachate, water and wastewater.

3. The cover according to claim 1, wherein the cementitious material is selected from the group consisting of portland cement, blended cement, masonry cement, calcium aluminate, slag cement, alkali-activated slag cement, coal fly ash, cement kiln dust, calcined gypsum, and any mixture thereof.

4. The cover according to claim 1 wherein the water-based paint is waste water-based paint.

5. The cover according to claim 1 wherein the powder filler is selected from the group consisting of clay, ground recycled glass, shredded construction debris, demolition debris, sand, crushed stone dust, and any mixture thereof.

6. The cover according to claim 1, wherein the fiber is selected from the group consisting of shredded paper, shredded wood, polyethylene terephthalate, chopped straw, hay, and any mixture thereof.

7. The cover of claim 1 containing up to about 3% thickening agent.

8. The cover according to claim 7, wherein the thickening agent is selected from the group consisting of methyl cellulose, methyl hydroxypropyl cellulose, hydroxyethyl cellulose, and hydroxypropyl cellulose, and mixtures thereof.

9. The cover of claim 1 containing up to about 3% pigment.

10. The cover of claim 1 containing a chemical odor control additive.