WO1998021017A1 - Procede de fabrication d'un corps en beton sensiblement exempt de fissures - Google Patents

Procede de fabrication d'un corps en beton sensiblement exempt de fissures Download PDF

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Publication number
WO1998021017A1
WO1998021017A1 PCT/IB1997/001413 IB9701413W WO9821017A1 WO 1998021017 A1 WO1998021017 A1 WO 1998021017A1 IB 9701413 W IB9701413 W IB 9701413W WO 9821017 A1 WO9821017 A1 WO 9821017A1
Authority
WO
WIPO (PCT)
Prior art keywords
concrete
fiber sections
early
cracks
reinforcement
Prior art date
Application number
PCT/IB1997/001413
Other languages
German (de)
English (en)
Inventor
Thomas Friedrich
Original Assignee
Thomas Friedrich
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thomas Friedrich filed Critical Thomas Friedrich
Priority to JP52233598A priority Critical patent/JP2001504052A/ja
Priority to DE19781263T priority patent/DE19781263D2/de
Priority to AU47198/97A priority patent/AU4719897A/en
Priority to EP97909540A priority patent/EP0938406A1/fr
Publication of WO1998021017A1 publication Critical patent/WO1998021017A1/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/52—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
    • B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
    • B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
    • B28B23/046—Post treatment to obtain pre-stressed articles
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/07—Reinforcing elements of material other than metal, e.g. of glass, of plastics, or not exclusively made of metal
    • E04C5/073—Discrete reinforcing elements, e.g. fibres
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/34—Non-shrinking or non-cracking materials
    • C04B2111/343—Crack resistant materials

Definitions

  • the invention relates to the production of a substantially crack-free body made of concrete and a body made of concrete, which is produced by the method.
  • the purpose of the invention is therefore to create concrete bodies in which cracking is avoided both in the young concrete and in the hardened concrete, so that the concrete body is both usable (liquid-tight) and questionable, so that there are no cracks either by force still occur due to external forces (load).
  • a compressive stress reserve is adjusted across the concrete cross-section so that the concrete tensile strength is never exceeded.
  • the prestressing can only be applied from a minimum concrete compressive strength of fc, min> 20.0 - 25.0 N / mm 2 . Only from this point in time is the pre-tension fully effective. In addition to this mode of action, the
  • Provision of a sufficient compressive stress reserve by prestressing and preferably early application of the prestressing force due to the strengthening of the young concrete by glass fibers;
  • all artificial fibers which can be mixed with the concrete in sufficient quantities and which increase the elasticity of the concrete and preferably also the early strength can be considered as fibers.
  • artificial fibers are to be understood in particular to mean plastic fibers, carbon fibers and glass fibers.
  • the desired effect cannot be achieved with the known addition of steel fibers.
  • the use of alkali-resistant glass fibers is particularly advantageous and preferred. With these fibers, such a good bond between the fibers and the concrete is achieved that the desired high elasticity of the concrete can be achieved to prevent early cracking, and furthermore - which is preferred - there is a significant increase in the early strength of the concrete.
  • AR glass fibers ideally meet these conditions.
  • a kilogram of AR glass fibers with a diameter of 0.013 mm and a length of 13 mm contains approximately 214 million individual fibers.
  • steel fibers with a diameter of 0.8 mm this is only 14,200 fibers, that is about 50,000 times less. This explains the significantly different mode of action of e.g. AR glass and steel fibers.
  • the prestressing force is applied at an earlier point in time of hardening than with fiber-free concrete. This means that the reliable effect of the pretensioning force on the crack behavior can be used at an earlier point in time than previously customary. Tests have shown that the prestressing can be applied from a minimum concrete cube compressive strength of approx. 20-25 N / mm 2 (cube), or with corresponding values of the cylinder compressive strength.
  • the prestress can therefore be applied from the compressive strength value mentioned, which is reached after 24 to 96 hours, often already after 24 to 60 or 24 to 48 hours.
  • the existence of sufficient compressive strength is determined by testing a comparison block (cube or cylinder), which is produced simultaneously with the concrete block under the same conditions and with the same parameters (concrete composition, fiber reinforcement).
  • the strength of the concrete body itself can be checked using known test methods.
  • the aforementioned prestressing means can be prestressing bars or bundle reinforcements, as are known in prestressed concrete, e.g. one strand per meter of the body for applying a prestressing force of 180 kN.
  • the prestressing means and their dimensioning are known, however, and are not explained in more detail here.
  • flaccid reinforcements can be provided in a known manner. However, as mentioned, these have no influence on the prevention of premature cracks.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Architecture (AREA)
  • Structural Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Civil Engineering (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
  • Reinforcement Elements For Buildings (AREA)

Abstract

L'objet de l'invention est d'éviter les fissures tant dans le béton neuf que dans le béton durci. Afin d'éviter les fissures dans le béton neuf, un grand nombre de sections de fibres de verre, par exemple résistantes aux alcalins, est ajouté au béton et forme une micro-armature qui augmente la solidité du béton et évite les fissures précoces du béton. Dans une deuxième phase, on peut ainsi appliquer plus tôt une force de précontrainte sur le corps en béton pendant sa prise, ce qui évite l'apparition ultérieure de fissures.
PCT/IB1997/001413 1996-11-13 1997-11-10 Procede de fabrication d'un corps en beton sensiblement exempt de fissures WO1998021017A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP52233598A JP2001504052A (ja) 1996-11-13 1997-11-10 本質的に亀裂のないコンクリート体の製造方法
DE19781263T DE19781263D2 (de) 1996-11-13 1997-11-10 Verfahren zur Herstellung eines im wesentlichen rißfreien Körpers aus Beton
AU47198/97A AU4719897A (en) 1996-11-13 1997-11-10 Process for producing a substantially crack-free concrete body
EP97909540A EP0938406A1 (fr) 1996-11-13 1997-11-10 Procede de fabrication d'un corps en beton sensiblement exempt de fissures

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2806/96 1996-11-13
CH280696 1996-11-13

Publications (1)

Publication Number Publication Date
WO1998021017A1 true WO1998021017A1 (fr) 1998-05-22

Family

ID=4242016

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB1997/001413 WO1998021017A1 (fr) 1996-11-13 1997-11-10 Procede de fabrication d'un corps en beton sensiblement exempt de fissures

Country Status (5)

Country Link
EP (1) EP0938406A1 (fr)
JP (1) JP2001504052A (fr)
AU (1) AU4719897A (fr)
DE (1) DE19781263D2 (fr)
WO (1) WO1998021017A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102059733A (zh) * 2010-10-27 2011-05-18 王强 一种混凝土与高分子材料的复合制作工艺

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2558140A1 (de) * 1974-12-23 1976-07-01 Nat Res Dev Glasfaserverstaerkte zementmasse und verfahren zu ihrer herstellung
JPS63147608A (ja) * 1986-12-11 1988-06-20 運輸省港湾技術研究所長 非金属性緊張材によるプレストレストコンクリ−ト及びその製造法
US4865213A (en) * 1988-03-10 1989-09-12 Kruger Paul J Composite panel, wall assembly and components therefor
US5114653A (en) * 1985-11-07 1992-05-19 Akzo N.V. Processes of manufacturing prestressed concrete
NL9101922A (nl) * 1991-11-19 1993-06-16 Akzo Nv Beton gewapend met, bij voorkeur met vezels versterkte, kunststof staven alsmede bijbehorende wapeningsstaaf.
EP0621381A1 (fr) * 1993-04-22 1994-10-26 Horst Dr.-Ing. Kinkel Elément d'armature précontraint
WO1995018775A1 (fr) * 1994-01-10 1995-07-13 Tiremix Corporation Beton de ciment renforce avec des particules de caoutchouc

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2558140A1 (de) * 1974-12-23 1976-07-01 Nat Res Dev Glasfaserverstaerkte zementmasse und verfahren zu ihrer herstellung
US5114653A (en) * 1985-11-07 1992-05-19 Akzo N.V. Processes of manufacturing prestressed concrete
JPS63147608A (ja) * 1986-12-11 1988-06-20 運輸省港湾技術研究所長 非金属性緊張材によるプレストレストコンクリ−ト及びその製造法
US4865213A (en) * 1988-03-10 1989-09-12 Kruger Paul J Composite panel, wall assembly and components therefor
NL9101922A (nl) * 1991-11-19 1993-06-16 Akzo Nv Beton gewapend met, bij voorkeur met vezels versterkte, kunststof staven alsmede bijbehorende wapeningsstaaf.
EP0621381A1 (fr) * 1993-04-22 1994-10-26 Horst Dr.-Ing. Kinkel Elément d'armature précontraint
WO1995018775A1 (fr) * 1994-01-10 1995-07-13 Tiremix Corporation Beton de ciment renforce avec des particules de caoutchouc

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 8830, Derwent World Patents Index; Class A93, AN 88-210101, XP002054800 *
DATABASE WPI Section Ch Week 9327, Derwent World Patents Index; Class A18, AN 93-217611, XP002054801 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102059733A (zh) * 2010-10-27 2011-05-18 王强 一种混凝土与高分子材料的复合制作工艺

Also Published As

Publication number Publication date
AU4719897A (en) 1998-06-03
DE19781263D2 (de) 2000-08-24
JP2001504052A (ja) 2001-03-27
EP0938406A1 (fr) 1999-09-01

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