Masonry material utilizing recycled construction and demolition waste

Patent metadata

Field	Value
Publication number	US-11780774-B2
Application number	US-201917258594-A
Country	US
Kind code	B2
Filing date	Jul 11, 2019
Priority date	Jul 11, 2018
Publication date	Oct 10, 2023
Grant date	Oct 10, 2023

Abstract

The embodiments herein are directed to dry wall waste mixtures, formed under pressure into example embodiments referred to herein as dry wall waste blocks (DWBs) and/or gypsum wallboard waste blocks (GWWBs) and tile structures. DWBs/GWWBs mixtures in particular, often incorporate a higher percentage in the composite mixtures from about 60% up to 85% of dry wall waste than other mixtures and beneficially often incorporates substantially all of the wallboard facing paper as part of the composite mixture. That is, waste processing is simplified by comingling core and paper layers in the final product. DWBs/GWWBs mixtures utilize demolition and construction waste, replacing a high percentage of Portland cement with waste-derived binder.

First claim

We claim:

1. A recycled drywall waste structural composition, comprising:
a core material, wherein the core material includes: 60 percent up to about 85 percent by total dry weight of wallboard demolition waste; wherein the demolition waste further comprises 2 percent (%) up to 15 percent (%) by dry weight of recycled paper waste, a dry density range of 1.20-1.23 g/cm 3 , a resultant percent water absorption of 26.5 up to 36.3, and a resistance to thermal conductivity ranging from 0.266 m 2 K/W down to 0.251 m 2 K/W.

2. The recycled drywall waste structural composition of claim 1 , wherein the wallboard demolition waste includes a core material of gypsum.

3. The recycled drywall waste structural composition of claim 1 , wherein the 2 percent (%) up to 15 percent (%) by dry weight of recycled paper waste is a non-removed facer and backer paper of the gypsum wallboard demolition waste.

4. The recycled drywall waste structural composition of claim 1 , wherein the 2 percent (%) up to 15 percent (%) by dry weight of recycled paper waste is at least one of: a newspaper print paper and a paper that is not newspaper print paper.

5. The recycled drywall waste structural composition of claim 1 , wherein the composition includes a plurality of aggregates in percent by dry weight greater than 20%.

6. The recycled drywall waste structural composition of claim 5 , wherein the composition includes a plurality of aggregates in percent by dry weight up to 20%.

7. The recycled drywall waste structural composition of claim 1 , wherein the composition includes a plurality of aggregates selected from at least one of: sand, stone, gravel, slag, fly ash, glass, silica, expanded slate, clay, pumice, perlite, diatomaceous earth, shale, crushed rock, straw, glass fiber, and plastic fiber.

8. The recycled drywall waste structural composition of claim 7 , wherein the percent of clay by dry weight ranges from about 20 percent (%) up to 30 percent (%).

9. The recycled drywall waste structural composition of claim 1 , wherein the composition includes a percent by dry weight of cementitious binders from about 10% up to 20%.

10. The recycled drywall waste structural composition of claim 9 , wherein the cementitious binders is at least one of: Portland cement, synthetic pozzolans, and natural pozzolans.

11. The recycled drywall waste structural composition of claim 10 , wherein the synthetic pozzolans and natural pozzolans includes at least one of: fly ash, ground granulated blast furnace slag, silica fume, volcanic ash, and lime.

12. The recycled drywall waste structural composition of claim 10 , wherein a maximum effective percent of pozzolans to Portland cement is up to 100 percent (%).

13. The recycled drywall waste structural composition of claim 1 , wherein the structural composition has a compressive strength from 8.5 Mpa up to 10.5 Mpa.

14. The recycled drywall waste structural composition of claim 1 , wherein the structural composition is configured as at least one of: a masonry block, a masonry brick, a masonry load-bearing solid shaped unit configured with one or more channels, a tile, and a pottery structure.

Assignees

• Univ Washington State

Inventors

• Miyasaka Taiji
• Drake David

Classifications

• C04B18/167 Primary

  Recycled materials, i.e. waste materials reused in the production of the same materials · CPC title

• B28B11/04

  for coating {or applying engobing layers}(glazing, engobing C04B) · CPC title

• C04B18/142

  Steelmaking slags, converter slags · CPC title

• C04B18/16 Primary

  from building or ceramic industry · CPC title

• C04B18/243

  Waste from paper processing or recycling paper, e.g. de-inking sludge (burned paper processing waste C04B18/10) · CPC title