Fire-resistant high performance concrete composition
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C04B-014/48
C04B-016/06
출원번호
US-0203378
(2001-02-08)
우선권정보
FR-0001742 (2000-02-11)
국제출원번호
PCT/FR01/00369
(2003-02-20)
§371/§102 date
20030220
(20030220)
국제공개번호
WO01/58826
(2001-08-16)
발명자
/ 주소
Orange, Gilles
Prat, Evelyne
Casanova, Pascal
Behloul, Mouloud
출원인 / 주소
Rhodia Chimie
Bouygues Travaux Publics
Lafarge
대리인 / 주소
Young &
인용정보
피인용 횟수 :
26인용 특허 :
0
초록▼
The invention concerns the use of organic fibers having a melting point lower than 300° C., an average length l more than 1 mm and a diameter Ø not more than 200 μm, in ultra high performance concrete for improving the concrete fire resistance, the amount of organic fibers being such that their volu
The invention concerns the use of organic fibers having a melting point lower than 300° C., an average length l more than 1 mm and a diameter Ø not more than 200 μm, in ultra high performance concrete for improving the concrete fire resistance, the amount of organic fibers being such that their volume ranges between 0.1 and 3% of the concrete volume after setting and the concrete having a compressive strength at 28 days of at least 120 Mpa, a bending strength of at least 20 Mpa, and a spread value in non-hardened state of at least 150 mm, the values being for a concrete preserved at 20° C., the concrete consisting of a particularly hardened cement matrix wherein metal fibres are dispersed.
대표청구항▼
1. A process for improving the fire resistance of an ultra-high performance concrete which comprises adding to the concrete organic fibers having a melting point of less than 300° C., an average length l of greater than 1 mm and a diameter Ø of at most 200 μm; the amount of organic fibers being such
1. A process for improving the fire resistance of an ultra-high performance concrete which comprises adding to the concrete organic fibers having a melting point of less than 300° C., an average length l of greater than 1 mm and a diameter Ø of at most 200 μm; the amount of organic fibers being such that their volume V ranges between 0.1 and 3% of the volume of the concrete after setting; the concrete having a characteristic 28-day compressive strength of at least 120 MPa, a flexural strength of at least 20 MPa, and a spread value in the unhardened state of at least 150 mm; the compressive strength, flexural strength and spread value being given for a concrete stored and maintained at 20° C.; said concrete comprising a hardened cementitious matrix in which metal fibers are dispersed and represent a volume V1 of the concrete after setting, which is obtained by mixing, with water, a composition which comprises, apart from the metal fibers:(a) cement; (b) aggregate particles having a particle size D90 of at most 10 mm; (c) pozzolanic-reaction particles having an elementary size ranging between 0.1 and 100 μm; (d) at least one dispersing agent; and satisfying the following conditions: (1) the percentage by weight of water with respect to the combined weight of the cement (a) and of the pozzolanic-reaction particles (c) lies within the 8-24% range; (2) the metal fibers have an average length l1 of at least 2 mm and an l1/Ø1 ratio of at least 20, Ø1 being the diameter of the fibers; (3) a ratio, V1/V, of the volume V1 of the metal fibers to the volume V of the organic fibers is greater than 1, and a ratio, l1/l, of the length of the metal fibers to the length of the organic fibers is greater than 1; (4) a ratio R of the average length l1 of the metal fibers to the size D90 of the aggregate particles is at least 3; and (5) the amount of metal fibers is such that their volume is less than 4% of the volume of the concrete after setting. 2. The process according to claim 1, wherein the concrete also includes reinforcing particles for improving the toughness of the matrix; said reinforcing particles having an acicular or flake shape, a mean size of at most 1 mm, and being present in a volume proportion of less than 35% of the combined volume of the aggregate particles (b) and of the pozzolanic-reaction particles (c).3. The process according to claim 1, wherein the l/Ø ratio of the organic fibers is between 20 and 500.4. The process according to claim 1, wherein the organic fibers have a length l of greater than 1.5 mm and at most equal to 12 mm.5. The process according to claim 1, wherein the organic fibers have a diameter of less than 80 μm.6. The process according to claim 1, wherein the ratio V1/V of the metal fibers to the organic fibers is at least 2.7. The process according to claim 1, wherein the amount of organic fibers is such that their volume is less than 2% of the volume of the concrete after setting.8. The process according to claim 7, wherein the amount of organic fibers is such that their volume is less than 1% of the volume of the concrete after setting.9. The process according to claim 1, wherein the organic fibers consist of a homopolymer or copolymer selected from the group consisting of polyacrylamide, polyether sulfone, polyvinyl chloride, polyethylene, polypropylene, polystyrene, polyamide and polyvinyl alcohol groups and mixtures thereof.10. The process according to claim 1, wherein the organic fibers are polypropylene fibers.11. The process according to claim 10, wherein the polypropylene fibers have a length of 6 mm and a diameter of 18 μm.12. The process according to claim 1, wherein the metal fibers are steel fibers.13. The process according to claim 1, wherein the metal fibers have a length ranging from 5 to 30 mm.14. The process according to claim 1, wherein the aggregate particles (b) have a particle size D75 of at most 6 mm.15. The process according to claim 1, wherein the organic fibers have a melting point of less than or equal to 200° C.16. A fire-resistant ultrahigh-performance concrete having a 28-day compressive strength of at least 120 MPa, a flexural strength of at least 20 MPa, and a spread value in the unhardened state of at least 150 mm; the compressive strength, the flexural strength, and the spread value being given for a concrete stored and maintained at 20° C.; said concrete comprising a hardened cementitious matrix in which metal fibers are dispersed and represent a volume V1 of the concrete after setting, which is obtained by mixing, with water, a composition which comprises, apart from the metal fibers:(a) cement; (b) aggregate particles having a particle size D90 of at most 10 mm; (c) pozzolanic-reaction particles having an elementary size ranging between 0.1 and 100 μm; (d) at least one dispersing agent; (e) organic fibers having a volume V; and satisfying the following conditions: (1) the percentage by weight of water with respect to the combined weight of the cement (a) and of the pozzolanic-reaction particles (c) lies within the 8-24% range; (2) the metal fibers have an average length l1 of at least 2 mm and an l1/Ø1 ratio of at least 20, Ø1 being the diameter of the fibers; (3) the organic fibers have a melting point of less than 200° C., an average length l of greater than 1 mm, and a diameter Ø of at most 200 μm; (4) a ratio, V1/V, of the volume V1 of the metal fibers to the volume V of the organic fibers is greater than 1, and a ratio, l1/l, of the length l1 of the metal fibers to the length l of the organic fibers is greater than 1; (5) a ratio R of the average length l1 of the metal fibers to the size D90 of the aggregate particles is at least 3; (6) the amount of metal fibers is such that their volume is less than 4% of the volume of the concrete after setting; and (7) the amount of organic fibers is such that their volume ranges between 0.1 and 3% of the volume of the concrete after setting. 17. The concrete according to claim 16, wherein the organic fibers have a diameter of less than 80 μm.18. The concrete according to claim 16, wherein the l/Ø ratio of the organic fibers is between 20 and 500.19. The concrete according to claim 16, wherein the ratio V1/V of the metal fibers to the organic fibers is at least 2.20. The concrete according to claim 16, wherein the organic fibers have a length of at most 12 mm.21. The concrete according to claim 16, wherein the amount of organic fibers is such that their volume is less than 1% of the volume of the concrete after setting.22. The concrete according to claim 16, wherein the organic fibers are polypropylene fibers having a length of less than 10 mm.23. The concrete according to claim 22, wherein the polypropylene fibers have a length of about 6 mm and a diameter of 18 μm.24. The concrete according to claim 16, wherein the metal fibers are steel fibers.25. The concrete according to claim 16, wherein the metal fibers have a length ranging from 5 to 30 mm.26. The concrete according to claim 16, further comprising reinforcing particles for improving the toughness of the matrix; said reinforcing particles having an acicular or flake shape, a mean size of at most 1 mm, and being present in a volume proportion of less than 35% of the combined volume of the aggregate particles (b) and of the pozzolanic-reaction particles (c).27. The concrete according to claim 26, wherein the reinforcing particles have an average size of at most 500 μm and are present in a volume proportion lying within the range from 5% to 25% of the combined volume of the aggregate particles (b) and of the pozzolanic-reaction particles (c).28. The concrete according to claim 26, wherein the reinforcing particles are wollastonite fibers.29. The concrete according to claim 26, wherein the reinforcing particles are mica flakes.30. The concrete according to claim 16, wherein the aggregate particles (b) have a particle size D75 of most 6 mm.31. The concrete according to claim 16, which is prestressed in pretension.32. The concrete according to claim 16, which is prestressed in post-tension.
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