WO2019038120A1 - Plancher composite bois-béton - Google Patents

Plancher composite bois-béton Download PDF

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Publication number
WO2019038120A1
WO2019038120A1 PCT/EP2018/071951 EP2018071951W WO2019038120A1 WO 2019038120 A1 WO2019038120 A1 WO 2019038120A1 EP 2018071951 W EP2018071951 W EP 2018071951W WO 2019038120 A1 WO2019038120 A1 WO 2019038120A1
Authority
WO
WIPO (PCT)
Prior art keywords
concrete
wood
composite floor
binder
mixture
Prior art date
Application number
PCT/EP2018/071951
Other languages
German (de)
English (en)
Inventor
Martina Schnellenbach-Held
Torsten Welsch
Barbara Milow
Original Assignee
Universität Duisburg-Essen
Deutsches Zentrum für Luft- und Raumfahrt e.V.
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 Universität Duisburg-Essen, Deutsches Zentrum für Luft- und Raumfahrt e.V. filed Critical Universität Duisburg-Essen
Publication of WO2019038120A1 publication Critical patent/WO2019038120A1/fr

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
    • E04B5/02—Load-carrying floor structures formed substantially of prefabricated units
    • E04B5/12—Load-carrying floor structures formed substantially of prefabricated units with wooden beams
    • 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
    • C04B28/04—Portland cements
    • 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
    • C04B28/24—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 alkyl, ammonium or metal silicates; containing silica sols
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
    • E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
    • E04B5/17—Floor structures partly formed in situ
    • E04B5/23—Floor structures partly formed in situ with stiffening ribs or other beam-like formations wholly or partly prefabricated
    • 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
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00603—Ceiling materials
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
    • E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
    • E04B5/17—Floor structures partly formed in situ
    • E04B5/23—Floor structures partly formed in situ with stiffening ribs or other beam-like formations wholly or partly prefabricated
    • E04B2005/232—Floor structures partly formed in situ with stiffening ribs or other beam-like formations wholly or partly prefabricated with special provisions for connecting wooden stiffening ribs or other wooden beam-like formations to the concrete slab
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0288—Repairing or restoring floor slabs

Definitions

  • the invention relates to a wood-concrete composite ceiling comprising a high-performance aerosol concrete, to processes for producing these wood-concrete composite ceilings, and to the use of high-performance aerosol concrete in wood-concrete composite ceilings.
  • a particularly great problem is the inadequate fire protection of wooden beam ceilings. More recently, the production of so-called wood composite ceilings has been established as a viable solution to this problem.
  • a foil is laid on the existing wooden beamed ceilings onto which a reinforced concrete slab, which is usually 60 to 140 millimeters thick, is installed.
  • the Schubverbund between wooden beams and steel concrete plate is ensured by composite elements such as composite screws, embedded in grooves expanded metal or corrugated sheets or the like.
  • the resulting hybrid cross-section increases both load-bearing capacity and serviceability. The soundproofing is improved as well as the vibration behavior and fire protection.
  • a composite ceiling made of wood and lightweight concrete with wood screws as connecting means is also proposed by the construction research project Fraunhofer IRB "Composite ceiling wood lightweight concrete” (1986 - 1988, project number 88008001351).
  • the present invention is therefore based on the object to provide wood-concrete composite ceilings with which the disadvantages of the prior art are avoided.
  • wood-concrete composite ceilings are to be provided, which are characterized by a good ratio of thermal conductivity, load capacity and weight.
  • the soundproofing properties should be improved compared with the prior art, but in any case should not be worsened.
  • this object is achieved by a wood-concrete composite floor comprising a high performance aerosol concrete, the high performance aerated concrete is available from a concrete mixture containing 10 to 85 vol .-% / m 3 airgel granules with a particle size in the range of 0.01 to 4 mm,
  • At least one light aggregate for example light sands, expanded clay and / or expanded glass
  • the concrete mixture may contain 10 to 75% by volume / m 3 of the airgel granulate, 200 to 900 kg / m 3 of the inorganic hydraulic binder, 20 to 40% by weight, based on the binder content of the at least one silica gel suspension, 2 to 5% by weight, based on the binder content of the at least one flow agent, and / or 10 to 60% by volume / m 3 of the at least one lightweight aggregate respectively.
  • the high-performance aerosol concrete contained in the wood-concrete composite floor is characterized by an extremely favorable ratio between bulk density and compressive strength, compressive strength and thermal conductivity as well as excellent soundproofing properties. Moreover, it is completely inorganic and thus non-flammable and non-toxic or carcinogenic.
  • the high-performance aerosol concrete has only about 30 to 50% of the raw density of reinforced concrete and thus also allows the use of wood-concrete composite ceilings in weight-sensitive areas. Since the sound and fire protection properties far surpass those of normal concrete, the reinforced concrete slabs can be made thinner in the use of high performance aerated concrete in the wood-concrete composite ceilings according to the invention than corresponding reinforced concrete slabs in wood-concrete composite slabs from the prior art, which is another Weight reduction results.
  • the thermal conductivity is compared to normal concrete only about one-tenth, so that by the use of high-performance aerosol concrete without further measures at the same time also carried out an energetic renovation.
  • the wood-concrete composite floor comprises high-performance aerosol concrete, which is available based on the blend compositions for high performance concrete (HPC), ultra-high performance concrete (UHPC) and lightweight concrete (LC).
  • the aerated concrete has extraordinary thermal insulation properties and one with Normal concrete comparable compressive strength.
  • the outstanding thermal insulation properties are achieved by the use of airgel granules, in particular in an amount of 10% by volume to 75% by volume / m 3 , in particular 60 to 65% by volume / m 3 .
  • the grain size of the airgel is 0.01 to 4 mm, in particular 1 to 4 mm. This grain size can be obtained by simple sieving. This fine particles, especially dust are removed. The presence of these fines leads to a deterioration of the compressive strength values.
  • the hydraulic binder is preferably contained in a proportion of 500 to 550 kg / m 3 in the concrete mixture for the high performance aerosol concrete of the wood-concrete composite ceiling of the present invention.
  • the hydraulic binder comprises cement, in particular Portland cement.
  • the silica gel suspension of the concrete mixture preferably comprises 1 to 60% by volume of active substance (solids content).
  • the silica gel suspension particularly preferably comprises 50% by volume of active substance (solids content).
  • the concrete mixture preferably has a w / c of 0.20 to 0.60, more preferably a w / c of 0.28 to 0.35.
  • composition of the individual components of the airgel concrete takes place taking into account the known mixing compositions for HPC, UHPC and LC.
  • the examined components are listed below:
  • Another important aspect for the development of the compressive strength of aerated concrete is the type of storage.
  • Three different types of storage were considered during the tests: Dry storage at an ambient temperature of 20 ° C ⁇ 2 ° C, mixed storage according to EN 12390-2 (EN 12390-2 Ber 1: 2012-02 Testing hardened concrete - Part 2: Making and Berlin, Beuth Verlag, 2012) for six days under water at a water temperature of 20 ° C ⁇ 2 ° C and the following 12 days in air at an ambient temperature of 20 ° C ⁇ 2 ° C.
  • EN 12390-2 EN 12390-2 Ber 1: 2012-02 Testing hardened concrete - Part 2: Making and Berlin, Beuth Verlag, 2012
  • Fig. 1 shows the temperature curves for the mixture M IO. During the first few hours, a significant increase in core temperatures was observed. After five to eight hours, the maximum temperature was reached. The high core temperature resulted from the high cement content and the addition of silica fume (see also Held M High-Strength Constructive Lightweight Concrete 1996; 7: 411-415). The three temperature curves do not decrease as much as they rise.
  • the core temperature for the mixtures M 1 to M 13 after 26 h was between 20 ° C and 25 ° C. During this period the air or water temperature was kept between 20 ° C and 25 ° C. Therefore, it can be assumed that the hydration process was completed after 26 h.
  • the heat treatment of the sample cubes is also shown in FIG. 1 shown.
  • the drying oven had an ambient temperature between 84 ° C and 93 ° C.
  • the core temperature of the concrete cubes reached a maximum of 80 ° C and depends mainly on the high cement content and the silica content. The influence of the selected heat treatment on the compressive strength is low.
  • Table 1 Compressive strengths (f C m, cube, i5o) of the optimized mixtures after 28 days (7 days)
  • the thermal conductivity of some mixtures was determined using the Transient Hot Bridge (THB) measurement method.
  • TTB Transient Hot Bridge
  • the results of the IfM and Gao et al. (loc.cit) are shown in FIG. A correlation between compressive strength and thermal conductivity is clearly visible. In both investigations, the thermal conductivity increases with increasing compressive strength (and bulk density).
  • the test results from Gao et al. (loc.cit.) lie between 8 MPa and 62 MPa with associated thermal conductivities between 0.26 W / (m-K) and 1.9 W / (m-K), whereas the pressure strengths and heat conductivities determined according to the invention are between 6 MPa and 25 MPa or 0.17 W / (mK) and 0.26 W / (mK). That is, for the high-performance aerosol concrete of the wood-concrete composite slabs according to the invention, smaller values for the thermal conductivity and thus better thermal insulation properties were found at comparable compressive strengths.
  • Fig. 3 shows the relationship between compressive strength and
  • the compressive strength correlated with the bulk density and reached values up to 25.0 MPa. With regard to the compressive strengths after seven and 28 days, no clear trend could be observed. The thermal conductivities became too 0.16 ⁇ ⁇ ⁇ 0.26 W / (m-K) determined, which is equivalent to good thermal insulation properties. The best mixture achieved a compressive strength of 10 MPa with an associated bulk density of 860 kg / m 3 and a thermal conductivity of 0.17 W / (m-K).
  • the wood-concrete composite ceiling comprises composite elements made of wood and composite elements made of high-performance aerosol concrete.
  • the composite elements of wood may include, for example, a conventional wooden beam ceiling.
  • Such a beamed ceiling comprises wooden supporting elements in the form of sawn or hewn (ceiling) beams resting on the walls.
  • the upper end may be a board floor made of boards attached across the beams.
  • the high performance aerosol concrete may in a preferred embodiment rest on the plank sheet. It can also be laid, for example, a film between the plank floor and the layer of high-performance aerosol concrete.
  • the layer of high performance aerosol concrete preferably has a thickness of 60 to 300 millimeters, in particular a thickness of 60 to 200 millimeters, most preferably of 140 millimeters.
  • the high-performance aerosol concrete may also comprise a reinforcement, for example made of steel.
  • the wooden composite elements may also comprise wooden beams with which the airgel concrete is directly connected.
  • the plank floor in the form of wooden boards can be omitted, for example.
  • the composite elements made of wood with the composite elements of airgel concrete are non-positively connected.
  • the frictional connection can be achieved, for example, by means of composite means.
  • all conventional and known from the prior art composite means in particular those which are suitable for conventional wood composite cover, can be used.
  • the composite means may include, for example, dowels, screws, adhesives, grooved expanded metal, perforated or corrugated sheets, nails and / or cervels or grooves, without being limited thereto (see FIGS. 4 to 7).
  • Fig. 4 shows an example of a compound of the composite wooden elements with the composite elements of airgel concrete using pin-shaped connecting means, such as special screws.
  • FIG. 5 shows, by way of example, a connection of the wooden composite elements with the composite elements of airgel concrete using perforated sheets.
  • FIG. 6 shows, by way of example, a plan view of the connection with perforated plates, which are shown in FIG. 5 is shown.
  • FIG. 7 shows by way of example a connection of the composite elements with the aid of grooves / cusps.
  • the composite means may be made of metallic materials and / or wood, for example.
  • composite anchors made of concrete in particular of ultra-high performance concrete, can be used.
  • the composite anchors made of concrete can be used in the previously described form.
  • grooves or cements made of concrete can be used.
  • the high-performance airgel comprised in the wood-concrete composite ceilings according to the invention can be produced, for example, using water using the mixture described above. It is of particular importance first of all to mix the constituents which are solid at room temperature with one another before the constituents which are liquid at room temperature, in particular Plasticizer or water-silica mixture and optionally water, are added.
  • Particularly low w / c values and associated high compressive strengths are obtained by cooling the addition water before mixing with the solid components, in particular to a temperature of less than 10 ° C, more preferably to less than 5 ° C.
  • Silica gel suspensions in the context of the present invention are commercially available and in particular comprise a highly reactive, high specific surface area, amorphous microsilica-water mixture, for example MC Centrilit Fume SX: Blaine value 20000, ie 4 to 5 times greater than cement / Binder. Mixing ratio 1: 1 (by volume).
  • Plasticizers according to the present invention are commercially available and include in particular commercially available polycarboxylates, for example Powerflow 3100: polycarboxylate ethers having 30 wt.% Solids content, high charge density and short side chains.
  • Powerflow 3100 polycarboxylate ethers having 30 wt.% Solids content, high charge density and short side chains.
  • Stabilizers according to the present invention are commercially available and include in particular commercially available organic polymers, for example MC Stabi 520, water-absorbent and water-storing cellulose.
  • the mixtures may also contain other conventional concrete admixtures and concrete admixtures.
  • EN 934-2 contains definitions and requirements for the following individual action groups:
  • accelerator solidification accelerator and hardening accelerator
  • Sand (p> 1400 kg / m 3 ) is generally not required because it is replaced by airgel granules.
  • the load-bearing capacity and the thermal conductivity of the wood-concrete composite slabs according to the invention comprising high-performance aerosol concrete can be further optimized by using the building material high-performance aerosol concrete graded or graded.
  • Airgel concretes dry within a few days and show only a low water absorption capacity after hardening. Aerogels are non-toxic, not carcinogenic and have been classified by the Federal Environmental Agency of the Federal Republic of Germany as "largely harmless material”. Airgel concrete is an excellent fire protection material and has a high sound absorption.
  • the wood-concrete composite ceiling according to the invention thus also has the advantage that it retards the spread of fire more than wood-concrete Composite ceilings of the prior art.
  • the high-performance aerosol concrete conducts the heat emitted by a fire source much worse than conventional reinforced concrete, thus increasing the time until the ignition of the wooden composite elements.
  • a particularly advantageous fire behavior results when the composite elements made of wood are completely surrounded by the composite elements of high-performance aerosol concrete.
  • the rebar reinforcement used hitherto also be replaced for example by a reinforcement made of glass fiber reinforced plastic.
  • This reinforcement is commercially available, but so far used only in normal or conventional lightweight concrete.
  • the high-performance aerosol concrete contained in the wood-concrete composite slabs according to the invention thus enables the production of GFRP-reinforced airgel concrete components.
  • GFRP reinforcement with a thermal expansion coefficient of 6 x 10 "6 1 / K considerably better suited for use in Aerogelbeton as concrete steel. Since Aerogelbetonbaumaschine is used almost exclusively in areas where high demands are made to the thermal protection, turns out to the The use of GFRP reinforcement is also particularly advantageous in this respect: the thermal conductivity of GFRP, at 0.7 W / (mK), is 85 times lower than the thermal conductivity of reinforcing steel, because GRP reinforcement, unlike rebar, has no requirements At an alkaline environment, smaller concrete coverages and thus a better cross-sectional utilization are possible.
  • the object of the invention is achieved by a method for producing a wood-concrete composite ceiling, wherein the Aerogeibetonmischung is poured onto the wooden ceiling on site, the concrete is non-positively connected to the wooden ceiling, optionally composite materials are introduced and then cured the concrete becomes .
  • the concrete mixture is prepared by first mixing all solid at room temperature components before the liquid at room temperature ingredients, in particular water-flow agent or water-silica mixture and optionally water, are added.
  • the addition water in the preparation of the aerobic concrete mixture, is cooled before mixing to a temperature of less than 10 ° C., more preferably to a temperature of less than 5 °.
  • the object according to the invention is achieved by the use of a high-performance aerosol concrete as a composite element in a wood-concrete composite floor.
  • a high performance aerosol concrete is used which is obtainable from a concrete mix which

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Structural Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Architecture (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Building Environments (AREA)

Abstract

L'invention concerne un plafond composite bois-béton comprenant un béton à base d'aérogel haute performance, un procédé de fabrication de ces plafonds composites bois-béton et l'utilisation de béton à base d'aérogel haute performance dans des plafonds composites bois-béton
PCT/EP2018/071951 2017-08-21 2018-08-13 Plancher composite bois-béton WO2019038120A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017119096.1 2017-08-21
DE102017119096.1A DE102017119096A1 (de) 2017-08-21 2017-08-21 Holz-Beton-Verbunddecke

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WO2019038120A1 true WO2019038120A1 (fr) 2019-02-28

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WO (1) WO2019038120A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110565862A (zh) * 2019-08-29 2019-12-13 郑州大学 一种新型的轻木—混凝土楼盖及其施工工艺
EP3868970A1 (fr) * 2020-02-21 2021-08-25 Apb2 Dalle mixte préfabriquée pour la construction notamment de planchers ou de murs et procédé de fabrication

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT521425A1 (de) * 2018-07-04 2020-01-15 Klasch Spezial Bauartikel Gmbh Deckenkonstruktion

Citations (4)

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Publication number Priority date Publication date Assignee Title
EP0432484A2 (fr) * 1989-11-16 1991-06-19 SFS Handels Holding AG Elément de connexion
DE19702238A1 (de) 1997-01-24 1998-08-06 Hoechst Ag Verwendung von Aerogelen zur Körper- und/oder Trittschalldämmung
WO2015033547A1 (fr) * 2013-09-05 2015-03-12 パナソニックＩｐマネジメント株式会社 Panneau d'isolation thermique et son procédé de fabrication
DE102015210921A1 (de) * 2015-06-15 2016-12-15 Deutsches Zentrum für Luft- und Raumfahrt e.V. Hochleistungsaerogelbeton

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CH207958A (de) * 1938-12-30 1939-12-31 Geiger & Cie Verbundkonstruktion aus Holz und Beton.
DE4029134A1 (de) * 1989-11-16 1991-05-23 Stadler Heerbrugg Holding Ag Verbundkonstruktion
DE10341401B4 (de) * 2003-09-05 2006-02-09 Heinz Wieland Verbundeinrichtung für eine Holz-Beton-Verbindung
CA2960543C (fr) * 2014-09-30 2023-10-03 Universite Laval Systeme integre, son raccord et son procede de fabrication

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Publication number Priority date Publication date Assignee Title
EP0432484A2 (fr) * 1989-11-16 1991-06-19 SFS Handels Holding AG Elément de connexion
DE19702238A1 (de) 1997-01-24 1998-08-06 Hoechst Ag Verwendung von Aerogelen zur Körper- und/oder Trittschalldämmung
WO2015033547A1 (fr) * 2013-09-05 2015-03-12 パナソニックＩｐマネジメント株式会社 Panneau d'isolation thermique et son procédé de fabrication
DE102015210921A1 (de) * 2015-06-15 2016-12-15 Deutsches Zentrum für Luft- und Raumfahrt e.V. Hochleistungsaerogelbeton

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Title
GIBSON L.J.; ASHBY M.F.: "Cellular solids. 2nd Edition.", 1997, CAMBRIDGE UNIVERSITY PRESS, pages: 213
MEYER; BRUNO: "Verstärkung alter Holzbalkendecken mit Leichtbeton", CEMENTBULLETIN, 1990, pages 58

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110565862A (zh) * 2019-08-29 2019-12-13 郑州大学 一种新型的轻木—混凝土楼盖及其施工工艺
EP3868970A1 (fr) * 2020-02-21 2021-08-25 Apb2 Dalle mixte préfabriquée pour la construction notamment de planchers ou de murs et procédé de fabrication
FR3107539A1 (fr) * 2020-02-21 2021-08-27 Apb2 Dalle mixte préfabriquée pour la construction notamment de planchers ou de murs et procédé de fabrication

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