EP3728762A1 - Procede pour renforcer une structure de genie civil - Google Patents
Procede pour renforcer une structure de genie civilInfo
- Publication number
- EP3728762A1 EP3728762A1 EP17840592.4A EP17840592A EP3728762A1 EP 3728762 A1 EP3728762 A1 EP 3728762A1 EP 17840592 A EP17840592 A EP 17840592A EP 3728762 A1 EP3728762 A1 EP 3728762A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- resin
- particle size
- fabric
- layer
- fluid state
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
Classifications
-
- 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
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
-
- 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
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
- E04G2023/0251—Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements
Definitions
- the invention relates to a method for reinforcing a civil engineering structure.
- a first method of known surface reinforcement consists in bonding steel sheet plates to the concrete of the structure in addition to reinforced concrete reinforcements, in particular in tensioned parts of said structure.
- carbon fibers allows the development of another reinforcing process, which consists in coating a resin with a surface in a zone to be reinforced and then applying a strip of dry carbon fiber fabric on the coated surface, in order to manufacture the composite on the support itself.
- This process has undeniable advantages, such as its reinforcing ability by adding carbon fiber composites to non-planar surfaces as well as increased lightness and maneuverability. Nevertheless, only thin fabrics (up to thicknesses of the order of 0.5 mm) and low dry weights (up to 500g / m 2 ) can be impregnated directly when they are applied to the substrate which implies that the process is limited to weaker sections (or fiber densities) of reinforcement.
- An object of the invention is to at least partially overcome these disadvantages.
- the subject of the invention is a method for reinforcing a civil engineering structure, comprising the following steps: coating a surface of the structure with a first layer of resin in a fluid state, having a particle size called first particle size distribution ,
- the resin once polymerized, that is to say hardened, is the matrix of the composite forming the reinforcement of the structure.
- the resin has two functions since it makes it possible to stick the composite and to constitute its matrix.
- the method according to the present invention by the application of resins with calibrated granulometries, allows to saturate (to impregnate sufficiently) the dry fabric to form a composite, the first resin coating the support being sufficiently viscous to support the self weight of fabric, which makes it possible to reinforce the structure with a larger resistant section (density of fibers), by resorting to a so-called heavy dry fabric (weight per unit area greater than 600 g / m 2 ).
- the resin is in gel form in the fluid state.
- the fabric is composed of fibers having interstitial spaces, the first particle size and the second particle size being strictly less than the interstitial space, possibly zero (i.e. without added inert fillers).
- the first particle size is selected from the first particle size
- granular elements of the resin comprise nanoparticles and / or silica.
- the resin has a Brookfield viscosity at 23 ° C giving a shear rate of 15 to 25 Pa.s for a rotation speed of 1 s - 1 and 3 to 5 Pa.s for a rotation speed at 10s - 1 .
- the resin comprises a thickening agent.
- the resin has a zero particle size, that is to say without added inert fillers.
- granular elements or inert fillers are added in a proportion of between 2% and 12%, preferably between 5% and 10% by weight.
- FIG. 1 illustrates a perspective view of an exemplary implementation of the method according to the invention
- FIG. 2 illustrates an arrangement of carbon fibers within a fiber web of the example of FIG. 1.
- Figure 1 shows a particular example of implementation of the method according to the invention, used to reinforce or repair a reinforced concrete beam 1 supporting a floor 2 of building.
- the structural zone to be reinforced will generally be an area subjected to tensile stresses, in this case the underside 4 of the beam 1, but it would also be possible to reinforce in the same way an area of the civil engineering structure which is subjected to shear forces (these stresses inducing so-called main tensile stresses), for example by gluing a fabric flexible on the flanks 5 of the beam 1 considered here, the right supports 6 of this beam.
- the fiber fabric 3 is preferably in the form of a flexible strip 7 which extends in a longitudinal direction X and which is generally stored in the form of a roll.
- This band 7 consists of fibers some of which, referenced 8, extend in the longitudinal direction X, and others said frame, referenced 9, (possibly of different size of the fibers 8) extending in a transverse direction Y parallel to the width of the strip 7 (or optionally in an oblique direction).
- Each fiber 8, 9 is composed of filaments separated from each other by interstitial spaces 10.
- the diameter of the filaments is between 5 ⁇ m and 7 ⁇ m and that of the interstitial spaces is of the order of 2 ⁇ m.
- the fibers are for example carbon or glass, aramid or basalt.
- the longitudinal direction X of this strip is preferably parallel to these tensile stresses: thus, in the example shown in FIG. the drawings, the strip 7 is arranged parallel to the length of the beam 1. Reinforcing method
- the surface 4 of the civil engineering structure to be reinforced is cleaned, where appropriate sanded and degreased, or this surface may undergo any other mechanical or chemical preparation to ensure the durability of the reinforcement.
- a so-called primary coating can be applied beforehand on this surface.
- the surface 4 is coated with a thin film of resin in a fluid state, as will be detailed later.
- the fiber fabric 7, dry is then applied to the resin film still in a fluid state.
- the fabric 7 is stuck, that is pressed against the application surface, with sufficient pressure to equalize the thickness of the resin between the surface 4 and the fabric, and to impregnate the fabric with the resin.
- the masking is carried out using for example a pressure roller and / or a spatula.
- the fabric 7 is then coated with a second layer of resin.
- the fabric 7 is of heavy weight, that is to say of surface weight greater than 600g / m 2 , the particular advantage of the heavyweight fabrics being to offer a thicker (a resistant section) more important to equal surface, to avoid or limit the use of the superposition of several layers of fabric.
- the surface 4 is coated with a first resin layer provided with inert granular elements having a particle size called first particle size.
- Granulometry means maximum size of inert charges present in the resin.
- the dry fabric 7 is then applied to the resin film still in a fluid state.
- the fabric 7 is marouflé so that it is well impregnated with resin.
- the fabric is then coated with a second layer of resin, called closure, provided with granular elements having a particle size said second particle size, less than or equal to the first particle size, possibly zero (without inert fillers).
- the resin used is a fluid epoxy system for lamination and coating of porous substrates such as concrete or wood and suitable for forming or reinforcing composite structures.
- This resin is for example a bicomponent epoxy resin combining on the one hand a base resin, and on the other hand a curing agent, mixed during application.
- the base resin has a density close to 1.10 and a viscosity of between 1.0 and 1.5 Pa.s at 23 ° C.
- the curing agent has a density close to 1.0 and a viscosity of between 0.05 and 0.25 Pa.s at 23 ° C.
- the resin / hardener mixture when it is devoid of thickening agent, in a 100/30 mass ratio, has a viscosity of between 0.5 and 1.5 Pa.s at 23 ° C.
- a resin having a thixotropic character i.e. having a higher viscosity at rest. This character is obtained either by the addition of a rheo-thickening liquid agent, or by the addition of inert fillers or by a combination of the two.
- the resin used may be a thermoplastic or thermosetting resin, flame retarded or not, resistant to ultraviolet rays or not, which has the ability to adhere to both the surface of the civil engineering structure and the fibers of carbon and which is capable of blocking possible cracks in the surface to be reinforced 4.
- the resin is thixotropic when in the fluid state, and does not contain a solvent.
- the resin is a gel in the fluid state.
- a resin is used which polymerizes at room temperature.
- the same resin can be used whatever the material of the civil engineering structure (concrete, metal, wood).
- the application of the resin with granular elements of two different granulometries ensures both a sufficient viscosity for a good adhesion to the support and a good hold of the dry fabric (including during a ceiling application) while having a particle size sufficiently small to allow good impregnation of the fabric.
- the application of the resin with the first particle size, which is greater than the second particle size, makes it possible to obtain the desired viscosity, the granular elements (ie inert fillers) giving it a satisfactory consistency for adhering to the support and maintaining the weight of the fabric .
- the resin migrates in the interstices of the filaments.
- the resin interpenetrates the interstitial spaces of the tissue, despite the presence of granular elements.
- the application of the first layer on the support, on the one hand, of the second resin layer, called the closure layer, on the marouflaged fabric makes it possible to obtain a correctly saturated (or impregnated) composite for bonding to the substrate.
- the closure layer one part and constitution of the matrix of the composite on the other hand.
- a dry fabric with a heavy weight that is to say a surface weight greater than or equal to 600 g / m 2 , or even strictly greater than 600 g / m 2 , and even greater than or equal to 700 g / m 2 , up to 1500g / m 2 .
- the resin obtained after mixing the components has a Brookfield viscosity at 23 ° C giving a shear rate of 15 to 25 Pa.s for a rotation speed of 1s -1 and 3 to 5 Pa.s for a rotation speed of 10s -1 according to a Brookfield rheometer measurement plane / striated plane.
- the first particle size is strictly less than the interstitial space.
- the second particle size is smaller than the first, or even zero.
- the first particle size is less than or equal to 1 miti, preferably less than or equal to 0.1 phr.
- the resin may comprise a thickening agent such as a liquid additive, having a rheo-thickening character.
- a thickening agent such as a liquid additive, having a rheo-thickening character.
- the mixture is carried out separately for the hardener on the one hand and for the resin on the other hand, by means of a high turbulence deflocculation mixer.
- granular elements such as inert fillers are used to thicken the resin (and the hardener).
- the mixing is carried out separately for the hardener on the one hand and for the resin on the other hand, by means of a high turbulence deflocculation mixer. These mixtures are carried out in the workshop or in the factory, so that only the mixture of the base resin and the hardener is carried out on the application site by means of a simple mixer.
- the granular elements are very fine particles such as nanoparticles or, less expensively, very fine particle size fillers such as silica, for example pyrogenic and hydrophilic maximum particle size ranging from 0.04 to 0.99pm.
- the granular elements or inert fillers are added in a proportion of between 2% and 12%, preferably between 5% and 10% by weight, for the base resin, as for the hardener. This gives a resin that can remain in the ceiling on large thicknesses (0.7 to 0.9 mm) without casting.
- the granular elements have dimensions smaller than O, Oqmiti is about 30 times smaller than the interstitial space.
- the low pressure of manual masking is sufficient to cause the resin to migrate into the wire interstices and makes it possible to obtain a degree of saturation of the order of 75% for a fabric of 1200g / m 2 .
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Reinforced Plastic Materials (AREA)
- Working Measures On Existing Buildindgs (AREA)
- Revetment (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| HUE17840592A HUE073051T2 (hu) | 2017-12-21 | 2017-12-21 | Eljárás építõipari szerkezet megerõsítésére |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/FR2017/053793 WO2019122542A1 (fr) | 2017-12-21 | 2017-12-21 | Procede pour renforcer une structure de genie civil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3728762A1 true EP3728762A1 (fr) | 2020-10-28 |
| EP3728762B1 EP3728762B1 (fr) | 2025-07-09 |
Family
ID=61198868
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP17840592.4A Active EP3728762B1 (fr) | 2017-12-21 | 2017-12-21 | Procédé pour renforcer une structure de génie civil |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US11319718B2 (fr) |
| EP (1) | EP3728762B1 (fr) |
| JP (1) | JP7101784B2 (fr) |
| KR (1) | KR102445293B1 (fr) |
| AU (1) | AU2017443801B2 (fr) |
| ES (1) | ES3044914T3 (fr) |
| HU (1) | HUE073051T2 (fr) |
| MX (1) | MX2020006570A (fr) |
| PL (1) | PL3728762T3 (fr) |
| WO (1) | WO2019122542A1 (fr) |
Family Cites Families (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2640261B2 (ja) * | 1988-12-26 | 1997-08-13 | カネボウ・エヌエスシー株式会社 | 注入工法時に使用する溶液型の亀裂部被覆材 |
| US5640825A (en) * | 1994-04-12 | 1997-06-24 | Ehsani; Mohammad R. | Method of strengthening masonry and concrete walls with composite strap and high strength random fibers |
| US5649398A (en) * | 1994-06-10 | 1997-07-22 | Hexcel-Fyfe L.L.C. | High strength fabric reinforced walls |
| US6418684B1 (en) * | 1999-02-16 | 2002-07-16 | Engineered Composite Systems, Inc. | Wall reinforcement apparatus and method using composite materials |
| US6145260A (en) * | 1999-02-16 | 2000-11-14 | Engineered Composite Systems, Inc. | Wall reinforcing and waterproofing system and method of fabrication |
| TWI225116B (en) * | 2000-06-29 | 2004-12-11 | Nippon Oil Corp | Structure reinforcing method, structure-reinforcing reinforcing fiber yarn-containing material, reinforcing structure material and reinforced structure |
| JP2002020509A (ja) | 2000-07-10 | 2002-01-23 | Nippon Shokubai Co Ltd | コンクリート構造物の補強用樹脂組成物および補強方法 |
| US20020170651A1 (en) * | 2001-05-15 | 2002-11-21 | Edwards Christopher M. | Method for reinforcing cementitious structures |
| JP2003002948A (ja) | 2001-06-20 | 2003-01-08 | Toray Ind Inc | コンクリート構造物の補修・補強用エポキシ樹脂組成物、およびそれを用いてなる補修・補強方法 |
| US7980033B1 (en) * | 2002-07-24 | 2011-07-19 | Fyfe Co. Llc | System and method for increasing the shear strength of a structure |
| JP4127551B2 (ja) * | 2005-06-08 | 2008-07-30 | 独立行政法人土木研究所 | コンクリート構造物の補修方法及びコンクリート構造物 |
| ITMI20052156A1 (it) | 2005-11-11 | 2007-05-12 | Ruredil Spa | Manufatto edile e metodo di rinforzo di una struttura edile |
| JP5214864B2 (ja) * | 2006-09-05 | 2013-06-19 | 新日鉄住金マテリアルズ株式会社 | 構造物の補強方法 |
| US8479468B1 (en) * | 2007-05-21 | 2013-07-09 | Seyed Hossein Abbasi | Structure rehabilitation and enhancement |
| US10858850B2 (en) * | 2007-09-18 | 2020-12-08 | Fortress Stabilization Systems | Wall reinforcement system and method |
| US9139937B2 (en) * | 2012-11-28 | 2015-09-22 | Milliken & Company | Method of strengthening existing structures using strengthening fabric having slitting zones |
| ES2646943T3 (es) * | 2013-06-06 | 2017-12-18 | Sika Technology Ag | Conjunto y procedimiento para el refuerzo de estructuras de soporte |
| US9790697B2 (en) * | 2014-12-31 | 2017-10-17 | Fortress Stabilization Systems | Structure reinforcement system and method |
-
2017
- 2017-12-21 PL PL17840592.4T patent/PL3728762T3/pl unknown
- 2017-12-21 AU AU2017443801A patent/AU2017443801B2/en active Active
- 2017-12-21 ES ES17840592T patent/ES3044914T3/es active Active
- 2017-12-21 MX MX2020006570A patent/MX2020006570A/es unknown
- 2017-12-21 JP JP2020534446A patent/JP7101784B2/ja active Active
- 2017-12-21 EP EP17840592.4A patent/EP3728762B1/fr active Active
- 2017-12-21 US US16/771,633 patent/US11319718B2/en active Active
- 2017-12-21 KR KR1020207019816A patent/KR102445293B1/ko active Active
- 2017-12-21 HU HUE17840592A patent/HUE073051T2/hu unknown
- 2017-12-21 WO PCT/FR2017/053793 patent/WO2019122542A1/fr not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| KR20200102455A (ko) | 2020-08-31 |
| AU2017443801A1 (en) | 2020-07-02 |
| MX2020006570A (es) | 2020-09-09 |
| KR102445293B1 (ko) | 2022-09-20 |
| US20210071435A1 (en) | 2021-03-11 |
| PL3728762T3 (pl) | 2025-11-12 |
| JP7101784B2 (ja) | 2022-07-15 |
| HUE073051T2 (hu) | 2025-12-28 |
| JP2021514432A (ja) | 2021-06-10 |
| WO2019122542A1 (fr) | 2019-06-27 |
| US11319718B2 (en) | 2022-05-03 |
| CA3086425A1 (fr) | 2019-06-27 |
| EP3728762B1 (fr) | 2025-07-09 |
| ES3044914T3 (en) | 2025-11-27 |
| AU2017443801B2 (en) | 2024-07-25 |
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