WO1997039054B1 - Compositions and methods for manufacturing ettringite coated fibers and aggregates - Google Patents

Compositions and methods for manufacturing ettringite coated fibers and aggregates

Info

Publication number
WO1997039054B1
WO1997039054B1 PCT/US1997/006095 US9706095W WO9739054B1 WO 1997039054 B1 WO1997039054 B1 WO 1997039054B1 US 9706095 W US9706095 W US 9706095W WO 9739054 B1 WO9739054 B1 WO 9739054B1
Authority
WO
WIPO (PCT)
Prior art keywords
composite material
fibers
mineralized
ettringite
mineralized composite
Prior art date
Application number
PCT/US1997/006095
Other languages
French (fr)
Other versions
WO1997039054A3 (en
WO1997039054A2 (en
Filing date
Publication date
Priority claimed from US08/627,487 external-priority patent/US5786080A/en
Application filed filed Critical
Priority to EP97921161A priority Critical patent/EP0944450A2/en
Priority to JP53725497A priority patent/JP2000503732A/en
Priority to CA 2248671 priority patent/CA2248671A1/en
Priority to BR9708497A priority patent/BR9708497A/en
Priority to AU27279/97A priority patent/AU711512B2/en
Publication of WO1997039054A2 publication Critical patent/WO1997039054A2/en
Publication of WO1997039054A3 publication Critical patent/WO1997039054A3/en
Publication of WO1997039054B1 publication Critical patent/WO1997039054B1/en

Links

Abstract

Compositions and methods for the deposition of ettringite (3CaO.A12O3.3Ca(SO4).30-32H2O) onto the surfaces of fibers, aggregates, and other fillers. The ettringite is produced in situ within an aqueous suspension while in proximity to the fibers, aggregates, or other fillers to form a mineralized composite material comprising ettringite coated fibers, aggregates or other fillers. Ettringite treated fibers, aggregates, or other fillers are formed by adding chemical reactants such as calcium oxide and aluminum sulfate, which react together in the presence of water to form ettringite, which then precipitates onto the surface of the fibers or other substrates being treated. The ettringite treated fibers, aggregates or other fillers can be added to hydraulically settable materials to improve the chemical and mechanical bond between the fibers or other substrates within the resulting hardened hydraulically settable composite material, particularly a cementitious or concrete material.

Claims

AMENDED CLAIMS[received by the International Bureau on 4 November 1997 (04.11.97); original claims 1-10 and 15-33 replaced by amended claims 1-10 and 15-32 (4 pages)]
1. A mineralized composite material comprising: a substantially nonreactive substrate material selected from the group consisting of fibers and aggregates; and ettringite formed on at least a portion of a surface of the substrate material.
2. A mineralized composite material as defined in claim 1, wherein the ettringite covers at least about 25% of the surface of the substrate material.
3. A mineralized composite material as defined in claim 1, wherein the ettringite covers at least about 50% of the surface of the substrate material.
4. A mineralized composite material as defined in claim 1, wherein the ettringite covers at least about 75% of the surface of the substrate material.
5. A mineralized composite material as defined in claim 1, wherein the ettringite covers about 100% of the surface of the substrate material.
6. A mineralized composite material as defined in claim 1, wherein the substantially nonreactive substrate material comprises organic fibers.
7. A mineralized composite material as defined in claim 1, wherein the fibers are selected from the group consisting of cellulosic fibers, wood fibers, plant fibers, protein fibers, organic polymer fibers, ceramic fibers, carbon fibers, metal fibers, and mixtures of the foregoing.
8. A mineralized composite material as defined in claim 6, wherein the fibers comprise polyvinyl alcohol fibers.
9. A mineralized composite material as defined in claim 6, wherein the fibers comprise polylactic acid fibers.
10. A mineralized composite material as defined in claim 1, wherein the fibers comprise steel fibers.
11. A mineralized composite material as defined in claim 1, wherein the substantially nonreactive substrate material comprises an aggregate material.
12. A mineralized composite material as defined in claim 11, wherein the aggregate material comprises a naturally occurring mineral material.
13. A mineralized composite material as defined in claim 1 1, wherein the aggregate material comprises a synthetic material.
14. A mineralized composite material as defined in claim 11, wherein the aggregate material is selected from the group consisting of sand, gravel, rocks, limestone, silica, alumina, slags, expanded clay, talc, chalk and shale.
15. A mineralized fibrous composite comprising a fibrous substrate material A mineralized aggregate composite comprising an aggregate substrate material and ettringite formed on at least a portion of a surface of the aggregate substrate material.
16. A method for manufacturing a mineralized composite material comprising the steps of: providing a substantially nonreactive substrate material selected from the group consisting of fibers and aggregates; mixing together the substantially nonreactive substrate material, water, and at least two chemical reactants which form ettringite when combined in the presence of water to form an aqueous suspension, wherein ettringite formed within the aqueous suspension is deposited onto at least a portion of a surface of the substrate material to form the mineralized composite material; and isolating the mineralized composite material from the aqueous suspension.
17. A method for manufacturing a mineralized composite material as defined in claim 17, wherein the at least two chemical reactants which form ettringite when combined in the presence of water include are Ca(OH)2 and A12(S04)3-18H20.
18. A method for manufacturing a mineralized composite material as defined in claim 17, wherein the at least two chemical reactants which form ettringite when combined in the presence of water include 4CaO-3 Al2O3-S03 and 2CaS04-2H20.
19. A method for manufacturing a mineralized composite material as defined in claim 17, wherein the at least two chemical reactants which form ettringite when combined in the presence of water include CaO and 2AINH4(S04)2 12H20.
20. A method for manufacturing a mineralized composite material as defined in claim 17, wherein the at least two chemical reactants which form ettringite when combined in the presence of water include 3CaO Al203 and CaS04.
21. A method for manufacturing a mineralized composite material as defined in claim 17, wherein the substantially nonreactive substrate material comprises a fibrous material.
22. A method for manufacturing a mineralized composite material as defined in claim 22, wherein the fibrous material is selected from the group consisting of cellulosic fibers, wood fibers, plant fibers, protein fibers, organic polymer fibers, ceramic fibers, carbon fibers, and metal fibers.
23. A method for manufacturing a mineralized composite material as defined in claim 17, wherein the substantially nonreactive substrate material comprises an aggregate material. 22
24. A method for manufacturing a mineralized composite material as defined in claim 24, wherein the aggregate material comprises a naturally occurring mineral.
25. A method for manufacturing a mineralized composite material as defined in claim 24, wherein the aggregate material comprises a synthetic material.
26. A method for manufacturing a mineralized composite material as defined in claim 17, wherein the mineralized composite material is isolated from the suspension by draining the aqueous phase from the aqueous suspension.
27. A method for manufacturing a mineralized composite material as defined in claim 17, further comprising the step of washing the mineralized composite material with water.
28. A method for manufacturing a mineralized composite material comprising the steps of: providing a substantially nonreactive substrate material selected from the group consisting of fibers and aggregates; mixing together water, the substantially nonreactive substrate material, and
Ca(OH)2to form an aqueous suspension; combining Al2(SO4)3- 18H20 with the aqueous suspension such that it reacts with the Ca(OH)2 to form ettringite, which is thereby precipitated onto at least a portion of a surface of the substrate material in order to form the mineralized composite material; and isolating the mineralized composite material from the suspension.
29. A method for manufacturing a mineralized composite material comprising the steps of: providing a substantially nonreactive substrate material selected from the group consisting of fibers and aggregates; forming an aqueous slurry by combining water and the nonreactive substrate material; separately blending at least two chemical reactants in a substantially dry form which will form ettringite when combined with water to form a substantially dry blended mixture of the at least two chemical reactants; combining the substantially dry blended mixture of the at least two chemical reactants with the aqueous slurry to form an aqueous suspension, thereby causing the at least two chemical reactants to form ettringite, which is deposited onto at least a portion of a surface of the substrate material to form the mineralized composite material; and 23 isolating the mineralized composite material from the suspension.
30. A method for manufacturing a composite material as defined in claim 30, wherein the at least two chemical reactants which form ettringite when combined in the presence of water are 4CaO-3Al203-S03 and 2CaS04-2H20.
31. A method for manufacturing a composite material as defined in claim 30, wherein the at least two chemical reactants which form ettringite when combined in the presence of water are CaO and 2A1NH4(S04)2 12H20.
32. A method for manufacturing a composite material as defined in claim 30, wherein the at least two chemical reactants which form ettringite when combined in the presence of water are 3CaO Al203 and CaS04.
PCT/US1997/006095 1996-04-03 1997-04-03 Compositions and methods for manufacturing ettringite coated fibers and aggregates WO1997039054A2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP97921161A EP0944450A2 (en) 1996-04-03 1997-04-03 Compositions and methods for manufacturing ettringite coated fibers and aggregates
JP53725497A JP2000503732A (en) 1996-04-03 1997-04-03 Compositions and processes for the production of ettringite-coated fibers and aggregates
CA 2248671 CA2248671A1 (en) 1996-04-03 1997-04-03 Compositions and methods for manufacturing ettringite coated fibers and aggregates
BR9708497A BR9708497A (en) 1996-04-03 1997-04-03 Compositions and processes for the manufacture of fibers and aggregates coated with etringite
AU27279/97A AU711512B2 (en) 1996-04-03 1997-04-03 Compositions and methods for manufacturing ettringite coated fibers and aggregates

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/627,487 US5786080A (en) 1996-04-03 1996-04-03 Compositions and methods for manufacturing ettringite coated fibers and aggregates
US08/627,487 1996-04-03

Publications (3)

Publication Number Publication Date
WO1997039054A2 WO1997039054A2 (en) 1997-10-23
WO1997039054A3 WO1997039054A3 (en) 1997-11-27
WO1997039054B1 true WO1997039054B1 (en) 1997-12-24

Family

ID=24514845

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/006095 WO1997039054A2 (en) 1996-04-03 1997-04-03 Compositions and methods for manufacturing ettringite coated fibers and aggregates

Country Status (7)

Country Link
US (1) US5786080A (en)
EP (1) EP0944450A2 (en)
JP (1) JP2000503732A (en)
KR (1) KR20000004907A (en)
AU (1) AU711512B2 (en)
BR (1) BR9708497A (en)
WO (1) WO1997039054A2 (en)

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