CA2352105C - Method for treating a material based on concrete, mortar or the like - Google Patents
Method for treating a material based on concrete, mortar or the like Download PDFInfo
- Publication number
- CA2352105C CA2352105C CA002352105A CA2352105A CA2352105C CA 2352105 C CA2352105 C CA 2352105C CA 002352105 A CA002352105 A CA 002352105A CA 2352105 A CA2352105 A CA 2352105A CA 2352105 C CA2352105 C CA 2352105C
- Authority
- CA
- Canada
- Prior art keywords
- viscosity
- mixture
- compounds
- gel
- mixtures
- 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.)
- Expired - Fee Related
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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
-
- 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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/46—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with organic materials
- C04B41/48—Macromolecular compounds
- C04B41/4803—Polysaccharides, e.g. cellulose, or derivatives thereof
-
- 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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
- C04B41/61—Coating or impregnation
- C04B41/62—Coating or impregnation with organic materials
- C04B41/63—Macromolecular compounds
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/44—Thickening, gelling or viscosity increasing agents
- C04B2103/445—Gelling agents
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/10—Mortars, concrete or artificial stone characterised by specific physical values for the viscosity
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Aftertreatments Of Artificial And Natural Stones (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Processing Of Solid Wastes (AREA)
- Disintegrating Or Milling (AREA)
- Pigments, Carbon Blacks, Or Wood Stains (AREA)
- Paints Or Removers (AREA)
Abstract
The invention concerns a method for treating a material based on concrete, mortar, cement, stone, stucco or the like, comprising steps which consist in: mixing one or several active products with a gel; applying a continuous coat of the resulting mixture over the entire surface of the material to be treated.
Description
., ~
A METHOD FOR TRFATINO A MATERZAL BASEp ON CONCRZTE, MORTAR
AND TtIE LTKE
The invent.i.on relates to a method for traating a material based on concrete, cement, mortar or sizn~lar, or based on other materials usect in construetion sueh as stone or stucco wha.ch may in certain cases be reinfo.rced or assembled with metallic elements.
It relates notably to a method for the deep diffusion of active substances within a material baseO on concrete, cement, mortar, stone, stucco Qr similar.
Finally, it relates to a carrier for the dzffusion of active subszances in a material based on ConcreLe, cement, mortar or similar, or IC1a'Cerials baseCi on BtoIie o.Z' stt,.2CCO.
Tt is normal practice to add one or mo.475-, activ~ substance,;
to a mazeriai such as a concrete, with a view to a particu~ar action on the concrete, mo.rtar or .scone witf, a vi.ew for example to protecting the included re.inforcements_ Thi-s s~ctive substarice or substanccs can be a.ncorporated in zhe ~:uncrete, as adoitives, during the pouring operata.on or during trie time when the concrete is settirng.
Ir may also be necessary to diffuse active substances of various natures a-n a materzal based on cozicrete, cement, mortar or siniilar, severa.i yEaz:s afrer it has set.
It inay for example be a case of lacquer, cleaning su.bstances, compounds for effecting a specific treatttient on the material, for example with a view to rP-mforcing it, increasing the content of certain components or combating certain. defects or the effect of chemical agents which inay have difiused in the concrete as it aged.
Such treataaent substances are for example used for concretes, for limiting the corrosion appeari.ng on the reinforcements.
Concretes were in fact for a long time considered to be a durable material, whose reinforcements were protected from corros:~on by the high ph of the environment.
Tz is however found today that the majorlty of damage found on concrete structures results frorti the corrosion of the reinfoxcements, the protection of which may be destroyed either by a reciuction in the pH or by the ingress of aqqress~-ve chemical agents such as chloricie ions, for e~,ample, or by a combined effect of these r_wo factors_ The reduction in the pH is notably due to the carbonatiori vf the c:oncrete. This redLzcLi.on destabilises the protect~ve JrzyaX .LGr' thE! Steel pr'&ser1t in Sol.d.(ld concrete_ ~
Mor-t'~over, i.ons such as chlorides can cori:ode the s Leel used in constructions uszng stone or stucco or in a material of the concrete, mortar, cement or silriilar- type, ev~.n if the pf-j remains high.
These chloricie ions can be introduced into the rrtaterial durifig the applicarion of defrosting salts, for exarnpa.e.
In order to r&store better durability to the concrete or stone structures thus attacked, it is known that the material can be impreunated with a treatment composit~on comprising inhibito.-cs, also known as corrosion inhibztors.
These inhi..bitors act by modify.ing the compos.ition of the surface of the steel, so as to make the reinforcements more resistant to corrosion.
Corxosion inhzbitors a-re generally applied, in the form of an aqueous solution, to the surface of the material, for example concrete, to be treated.
The methQds useq for rrEakIng the t.reatment substances, such as corrosion -inhibitors, penetrate within a material based on conr-rete or simz.lax, do however have drawbacks.
Tt :i.s in fact necessary for the corrosion inhibzr-ors to penQtrdte into the criaterial sLaffzcient3.y deeply to cover -r-he reinforcef ents situated in a corrosive environment.
To do tni.s, the r-reatment composition is generally applied sevefal times, normally from five to ten, in order to obtain the necessary quantity of inhibitors in the concrete.
g in addit-ion, tnP depth of penet.ration obtained deperias notably on the temperature and humidi-ty cc,nd.itions at thE
time of applicatzon, and on the porosity of the support.
It is thus generally necessary to dry the support bet-ween L-ach application of. t.he treatment oampos~tic~n.
It has also been proposed to associate, with corrosian inhibitors, a chemical agerit in the form of a gel, to enable the inhib.i-tors to stay in position within a crack or a hole present in a st.rucrure.
The aim of thf~-, invention is to responc! to these clrawbacks by proposing a method allowi.ng the di.ffusion, in depth, of active sQt)stances within a concrete, cement, mortar, stone, stucco or similar material, in a reduced number of applications and without paxticular treatment of the material.
The main aim of the invention -is not to heap 2.n place a composjtion in, for example, a cavity, or to facilitate the applicatjon thereof, but to improve its performance by virtue notably of a better penetration and diffusion in the mater.ial., mak-~ng it possible to reduce the nuinber of applications necessary for obtaining the required result or to obtain a superior result.
To this end, the composirion according to the invent.iori, for the r-reatment of a inate,rial based on concrete, cement, moY'r-ar, sr-on(3, sttic(~o or s1T[tllciT, comprises one or rnore accive -5ubstances intended to penetrate deeply into the material.
AccQ.r.dirig To the invention, the method fQr t reating a mar_erzal based on conc~-ete, mortar, cement, stone, szucco or sin~ilar comprise-5 the steps consisting jn=
~ iriixing cne or nLore active substances wa-t.h a gel;
- app].ying a continucaus coating of the mixture obtained over tht= entiro surface of the material to be treated.
The appl~cation of r-he active substance or substances is effected on the material -i-n the qry or wet state_ The application can be carried out L)y brush, rolle~, spraying or any other method of applying a gel to a surface.
Preferably, the gel is applied to the material at a concentration varying between approximately 50 g/mz and approximately 5000 g/.m2, for example between approxamately 500 g/gt- anci approximately 1500 g/mz.
The gel can be applied in only one step or seve-ral steps.
The materidl is not d~.ied prior t.a the appl3-cation of the gel-According to one cnaracteristic of the invention, the ttlixture comprises one or more compounds able to increase the vi.~cosity of the mixture.
The compound.s able co i.ncrease the viscosity comprise gums, for example gum agar, gum ai~abic, gum tragacanzh, guar gum, and derivatives and/or mixtures of these subvtances.
Other compoQnds which can be used include celIu.lose, its derivatives, for example ca~boxymethylcel~ulose, etny1cellulose and/or mixtures of these substances.
Other ccarnpounds which can be used include sta-.17cYi, and de r.ivati. ves and/or mixtures thereof.
It caf~ also be envisaged usirig, by way of compourlds ablz to increase visco,uzty, dextranes, and derivatives or irr.Zxtures zherecof.
.
AnoLher compound which can be used is agarose and its clerivati,ves or mixtures.
Acco.z~'qing to one embodiment, the composition of the inventiori comprises a single compound able to incz-ease viscosity.
As a variant, the eQmposition acco.r~ding to the 2-nvention cornprises a mixture of several compounds able to increase vlscoSity.
The compounds ment.i.oned above are .~-n normal use in various ctlemical industries and their preparation w:i-ll therefore not be described iri any further detail here.
The choice of tne nature and quantity of the compound or compounds iricreasing viscosity depends riotabl.y on the viscosity required for the gel and the natQre of the ac~..ive s~ttastance incorporated therein.
'I'hus it can easi.ly be coriceived that a paxticular compound wil.1 inake it possit)le to obtain a gel witti the requ.ired viscosity wit.h a lesser quantity than anot_r-ier compound.
zn general terms, r,owever, the composition according to the inverltion compri ses approx.zttcate7.y 0. 1`o to approxirnatel_v 420%
by wea-ght of compound able to increa-gG viscosity, expressed wzth respect to the total weight of ~-he composition.
Accord.a.ng to one ernbodiment, the composition according to tne invention comprises approximately 0. 5 0 to approximately 5'zl by weight of compQund able to increase viscosity, expressed wirh respect to the total weight of the cottipos ition .
T.ikewise, the viscosity of the composition according to the invention can vary to a great extent, accoraing notably to the nature of the active substances dncx the characteristics of the material inr-o which they must penetrate.
A viscosity range which can be used for tYie aompas-ition accorda.ng to the invention varies from appxoximateiy 2000 to approximately 50,000 millipascal-seconds.
Accord;.ng to one embodiment, the viscosity of the compc.)sition according to the invention varies from approximately 10,000 to approximately 30,000 millzpascal-secands.
The aompositi9n ac.co~-aing to the invention can comprise one c,r more active sL~bstances irztendeci ta penetrate deeply into the material_ These active subsrances can be of different natures.
it rnay be a case for example of 1acquer..
~
It may also be a cas2 of substances intended to effec-~ a specific treatraent of the rrzaterial. Such a treatrnent can cGnsist for example of the aciclition of substarZces, ro.C
zxam~.~le sodiuun caxbonate, increasi nc; 'C he proportion of certain rrietalll c elements, notabl.y certain cations, iri the mazerial.
ozhex active substances coraprise for example hyqrophobic substances, for txample siloyanes, intended to limit thLz penetzation of water ~nto the material.
It rrtay also be a case of substances intended to reinforce che material, such as lithium or sodium silicates.
The active substances can also comprise corrosion inhibiting agents.
Suc:h substances comprise notably f 3.uo.rQp.t-tosphates, for example sodium mono.fluorophospnate, n.itrites, norably calcium or sodium, certain acids, for e~arnple poZytartric ac-I d, zirrc ohelates, ptrosphonates, molybdates dnd art~inoal~ohols such as dimethylethanolamine, ciiethanolamzrres or tra.echanolarnines, as well as rrrixtures comprising at least one of r-he substances menti-oned above.
Accordzng to one embodiment, the composition of the invention comprises only one active substance.
r3~ccordillg to another embodiment, zhe composa-tion of the i nvE'rltlon can cornpr3-se a fTllxtuY'e of several active substances whose ac:tion Un the material may pe ~detlti~al oz^
differerit_ Thus provision can be macte for in'xing, i.n a composita.or4 accorainq ro tlie invention, a substancc for rEinforcing the rnaterial and a co4rasion inhibitor.
The advantage of mixing the treatrnent substarices w-ith a gel is as fol.lnws:
- first of ail, 'che gel, because of its viscosity, makes it possible to apply to the material a very thick coating which cconsequently contains a large quantzty of active substance;
- because of this, each unit surface area of the material to be t.ceateci is in contact with a large quantity of act.-ive substance;
- because of the great ttxickness of the treatment coa.ting formecl by tne gel, the treatment substance contained in this gel is protected against any risk of excessively r-ap.ici evaporation in the air, whicri makes it possible to prQlong the pex-iod of contact of the tx-eazment substance with the mat =4l to be treat.ed.
Gonsequently, by v-Lrtue of the gel which contains the treatmerlt substance, the quantity of active substanca per unit surface area of the material to be treated is -Lncreaaecl, as well as the pex'iod of contact between the substarice and the material to be treated, which considerably increases zhe efficacy of the treatment sLzbstance.
1'he emuisJ-ons described for example in the patent US-5 556 915 can have neither the consistency nor rhe viscosity of a c~el.
It is z1hzrefore riot possible to apply an emujsi,on irl the form of a thick coating to the surface of the material to be Consequentlv, a thirr layer of etnulsion cannot con~cain a large cluanti.ty of treatment substance per Qnit surface area o1 the rndter.iaZ to be treated.
In addition, zr. the case of the ge-I useci -in the method accoz7cling to the invention, only the t:reatrnent substance enters the mater.~al to be treated, af1d the gel, hecause of it.s riI gh viscosity, remai ns on the surface and fo:i7ms Zriereon, after drying, a residue which it is necessary to rernove.
In other words, the gel has an ability firstly to retain a lar-ge quantity of treatme.nt substance and then secondly to release the lazt.ex so that it diffuses into the material.
Qn Lhe other hand, in the case ot an emulsion, a1l of it penetrates the material at the sa.me time as the treatment substarlce_ Consequently, the application of an emulsion contain-tng a zs.eatment substance to the mater.iai to be treated can under no circumstances have the actvaxl'tages procaxed by a gel containing ttie txeatizient substance.
Th(- -Lrjvention also aims to pz-otect a rne-thod for diffELzsing one or more active substances wi.th~n a base material of concrete, cemt-nt, mortar, stont-, stucco or simila.r.
Tt,~~ :ne~: hr) d dccurdinG to the invention, for che dGep d iffu7io;i of one ai_ inore active substances witnin a inateria t.
ba.seLA On Concrete, Cement, mortar, Stone, stucco or samil.ar, comprises the steps consistzng in:
- fo~m ng a gel of one or lttore actzve substances in a viscoelastlc trrass, the said gel being as described previousay, - applying che gel to the surface of the material.
According to the fnethod of the invention, the active sqjDstance or substanrres can be applied to the marer:.al in the dry or wet state_ It is therefore not necessary for the material to underg4, prior to the applicatiQn of the gel, a drying step.
The gel can be appliect to the surface of the material by ciiff ex-ent: methods. These inc.Iude, for example, an application by brush or roller, an app].icatican by spraying or any other method of applying a gel to a surface.
The gel is generally applied to the matezjal at a cuncentr3tion varying between approximately 50 g/m' and approximately 5000 g/m'.
Ac_cording to one emboclirtient, the gel is applied to the rnaterial at a concentration varying between approXa-maCely 500 g/m` and approximately 1500 g/rn E'irially, the invention relates to the use of a gel as a cacrier fo.r: the deep cfiffus~-on of one or more dcta.ve substances in a mater1al based on concrete, mortar, cerrtent, st. r~e, s-cucco or similar.
Accordzng to the ~.nvention, trie clel comprises one or more compounds able to increase viscosity, for exa.mple ce1~ ulos~, agarose, starch, det trane, a guin, and clerivatives and/or rni -nt ures of these substances .
The active substances comprise for example lacquers, addir-ives, reinforcament proclucts, corcosion Inhibitors arid hyds-opho}aic substances.
7'he irlvention will be better l.cnderstood in the following description, c~i ven vvitb referencP to the acco~ztpas~ying f zguxe.
F-igure 1 zs a ourve stiowing the concentration of aGrive substance daffused in a concrete accrording to the depth, usi.ng the gel of example 1.
In Figure 1, curve N 1 shows the results obtained with a convanr-ional treatment composition.
Curve N 2 shows the results obtained with a composition of the invention, and curve N" 3 shows the m-Lnimum acceptable value in 'Cerms of active sub3rance ln the concrete.
CKample 1 A 20% aqueous solution of monof]-uarophosphate was yellect by adding, und.er stz-rring and at room temperature, 2.5b by weigrit carboxymerhylcallulo$e (CMC) in powde.r forIil with a viscosdty of 20,000 ~aillipascal-seconda. This gel was applied by brusti or roller, sprayect or appl.iad by any othez-n~ethod of applying a gel to a surfac:e, at the rate of 1500 q/mI , on the buttress wal1 of a viac3uct heavily contaminated w--th ~h!_or~des_ The gel penetrated fully in approxiir-ately six hours, leaving a sl.igrit residue of CMC which can easily be washed off with watex'.
On an adjoining surface, an appla.cation by spraying of the same aqueous solution of monofluorophosphate - without CMC , was carried out, so as to obtain an applied quantity equivalent to that of Lhe gel. To do this, the monofluorophosphate was sprayed on 15 occasions during a toLal period of 8 hours.
Two days after the treatments, concrete cores were sainpled and analysed in order to define the monofluorophosphate concentration profile according to the depth. The results are shown in Figure 1.
Figure 1 shows tha2 not only does the use of the gel increase the penetration of the cnonofluorophosphate, but that the results are greatly improved.
The monofluorophosphate content is still sufficient at 60 mm in the case of the gel, whilst the conventional application by means of a solution has not made it possible to exceed a usetul depth of 20 mm-Fxample 2 In one litre of watex, 60 grams of starch glue and 1 gram of Praestol polyelectrolyte were dispersed under heavy stirring until a homogeneous mass was obtained. Whilst ma.inta.Lning zhe stirring, 200 grams of inonofluorophosphate were then introduced along with 0.1 grams of TritonTM X100 in order to increase the wettability of the gel.
The qel obtained was applied to the vault of a tunnel, at ~he rate of 1500 grams per m`. At the end of appz.-oximatety 3 days, the sl:rrace of 'i~he concrete showed only a dry residue of starch.
The penetration of the monofluorophosphate into thf~ concrete was measured on a 50 mm cIiameter core anct showed a penetration of approximately 60 mrti.
A conventional application by repeated spray~ng of an aqueous solution of monoflcaorophosphate showed, at an equiv4lent concentrazion, only a penetration of approximately 30 rnrtt.
Example 3 A gel was prepai~ed by mixing under heavy stirring 30 g per litre of water of carboxymethylcellulose, with a viscosity of 80,000 millipa$cal-seconcls. 200 g of nirrite per litre of wazer was then int.-coduced under stirring, until a homogeneous gel was obtained.
'S'he ge1 obtained was correctly dispex-sed and was applied to vertical and overhanging concrete surfaces in order to check adhesion _ More than 1500 g per mz of th1s gel was able to be applied w~thouz runs. The drying and the penetratz.on of the gel into the concrete took place in the same way as with a monofluorosphosphate gel.
~xainple 4 R gel was prepax'ed in the same way as in example 3 above, k~ut re~>lac~ng the nitrite w~-tri an identical quant.ity of 2-~~irnethylam.inoetria.nol .
A hon;ogQneous and wel.l-disper sec! gel was obtained and could be appl.~ed to conc_rete wal1.-- zn tne same way as the gels deccvribed in the previous examples_
A METHOD FOR TRFATINO A MATERZAL BASEp ON CONCRZTE, MORTAR
AND TtIE LTKE
The invent.i.on relates to a method for traating a material based on concrete, cement, mortar or sizn~lar, or based on other materials usect in construetion sueh as stone or stucco wha.ch may in certain cases be reinfo.rced or assembled with metallic elements.
It relates notably to a method for the deep diffusion of active substances within a material baseO on concrete, cement, mortar, stone, stucco Qr similar.
Finally, it relates to a carrier for the dzffusion of active subszances in a material based on ConcreLe, cement, mortar or similar, or IC1a'Cerials baseCi on BtoIie o.Z' stt,.2CCO.
Tt is normal practice to add one or mo.475-, activ~ substance,;
to a mazeriai such as a concrete, with a view to a particu~ar action on the concrete, mo.rtar or .scone witf, a vi.ew for example to protecting the included re.inforcements_ Thi-s s~ctive substarice or substanccs can be a.ncorporated in zhe ~:uncrete, as adoitives, during the pouring operata.on or during trie time when the concrete is settirng.
Ir may also be necessary to diffuse active substances of various natures a-n a materzal based on cozicrete, cement, mortar or siniilar, severa.i yEaz:s afrer it has set.
It inay for example be a case of lacquer, cleaning su.bstances, compounds for effecting a specific treatttient on the material, for example with a view to rP-mforcing it, increasing the content of certain components or combating certain. defects or the effect of chemical agents which inay have difiused in the concrete as it aged.
Such treataaent substances are for example used for concretes, for limiting the corrosion appeari.ng on the reinforcements.
Concretes were in fact for a long time considered to be a durable material, whose reinforcements were protected from corros:~on by the high ph of the environment.
Tz is however found today that the majorlty of damage found on concrete structures results frorti the corrosion of the reinfoxcements, the protection of which may be destroyed either by a reciuction in the pH or by the ingress of aqqress~-ve chemical agents such as chloricie ions, for e~,ample, or by a combined effect of these r_wo factors_ The reduction in the pH is notably due to the carbonatiori vf the c:oncrete. This redLzcLi.on destabilises the protect~ve JrzyaX .LGr' thE! Steel pr'&ser1t in Sol.d.(ld concrete_ ~
Mor-t'~over, i.ons such as chlorides can cori:ode the s Leel used in constructions uszng stone or stucco or in a material of the concrete, mortar, cement or silriilar- type, ev~.n if the pf-j remains high.
These chloricie ions can be introduced into the rrtaterial durifig the applicarion of defrosting salts, for exarnpa.e.
In order to r&store better durability to the concrete or stone structures thus attacked, it is known that the material can be impreunated with a treatment composit~on comprising inhibito.-cs, also known as corrosion inhibztors.
These inhi..bitors act by modify.ing the compos.ition of the surface of the steel, so as to make the reinforcements more resistant to corrosion.
Corxosion inhzbitors a-re generally applied, in the form of an aqueous solution, to the surface of the material, for example concrete, to be treated.
The methQds useq for rrEakIng the t.reatment substances, such as corrosion -inhibitors, penetrate within a material based on conr-rete or simz.lax, do however have drawbacks.
Tt :i.s in fact necessary for the corrosion inhibzr-ors to penQtrdte into the criaterial sLaffzcient3.y deeply to cover -r-he reinforcef ents situated in a corrosive environment.
To do tni.s, the r-reatment composition is generally applied sevefal times, normally from five to ten, in order to obtain the necessary quantity of inhibitors in the concrete.
g in addit-ion, tnP depth of penet.ration obtained deperias notably on the temperature and humidi-ty cc,nd.itions at thE
time of applicatzon, and on the porosity of the support.
It is thus generally necessary to dry the support bet-ween L-ach application of. t.he treatment oampos~tic~n.
It has also been proposed to associate, with corrosian inhibitors, a chemical agerit in the form of a gel, to enable the inhib.i-tors to stay in position within a crack or a hole present in a st.rucrure.
The aim of thf~-, invention is to responc! to these clrawbacks by proposing a method allowi.ng the di.ffusion, in depth, of active sQt)stances within a concrete, cement, mortar, stone, stucco or similar material, in a reduced number of applications and without paxticular treatment of the material.
The main aim of the invention -is not to heap 2.n place a composjtion in, for example, a cavity, or to facilitate the applicatjon thereof, but to improve its performance by virtue notably of a better penetration and diffusion in the mater.ial., mak-~ng it possible to reduce the nuinber of applications necessary for obtaining the required result or to obtain a superior result.
To this end, the composirion according to the invent.iori, for the r-reatment of a inate,rial based on concrete, cement, moY'r-ar, sr-on(3, sttic(~o or s1T[tllciT, comprises one or rnore accive -5ubstances intended to penetrate deeply into the material.
AccQ.r.dirig To the invention, the method fQr t reating a mar_erzal based on conc~-ete, mortar, cement, stone, szucco or sin~ilar comprise-5 the steps consisting jn=
~ iriixing cne or nLore active substances wa-t.h a gel;
- app].ying a continucaus coating of the mixture obtained over tht= entiro surface of the material to be treated.
The appl~cation of r-he active substance or substances is effected on the material -i-n the qry or wet state_ The application can be carried out L)y brush, rolle~, spraying or any other method of applying a gel to a surface.
Preferably, the gel is applied to the material at a concentration varying between approximately 50 g/mz and approximately 5000 g/.m2, for example between approxamately 500 g/gt- anci approximately 1500 g/mz.
The gel can be applied in only one step or seve-ral steps.
The materidl is not d~.ied prior t.a the appl3-cation of the gel-According to one cnaracteristic of the invention, the ttlixture comprises one or more compounds able to increase the vi.~cosity of the mixture.
The compound.s able co i.ncrease the viscosity comprise gums, for example gum agar, gum ai~abic, gum tragacanzh, guar gum, and derivatives and/or mixtures of these subvtances.
Other compoQnds which can be used include celIu.lose, its derivatives, for example ca~boxymethylcel~ulose, etny1cellulose and/or mixtures of these substances.
Other ccarnpounds which can be used include sta-.17cYi, and de r.ivati. ves and/or mixtures thereof.
It caf~ also be envisaged usirig, by way of compourlds ablz to increase visco,uzty, dextranes, and derivatives or irr.Zxtures zherecof.
.
AnoLher compound which can be used is agarose and its clerivati,ves or mixtures.
Acco.z~'qing to one embodiment, the composition of the inventiori comprises a single compound able to incz-ease viscosity.
As a variant, the eQmposition acco.r~ding to the 2-nvention cornprises a mixture of several compounds able to increase vlscoSity.
The compounds ment.i.oned above are .~-n normal use in various ctlemical industries and their preparation w:i-ll therefore not be described iri any further detail here.
The choice of tne nature and quantity of the compound or compounds iricreasing viscosity depends riotabl.y on the viscosity required for the gel and the natQre of the ac~..ive s~ttastance incorporated therein.
'I'hus it can easi.ly be coriceived that a paxticular compound wil.1 inake it possit)le to obtain a gel witti the requ.ired viscosity wit.h a lesser quantity than anot_r-ier compound.
zn general terms, r,owever, the composition according to the inverltion compri ses approx.zttcate7.y 0. 1`o to approxirnatel_v 420%
by wea-ght of compound able to increa-gG viscosity, expressed wzth respect to the total weight of ~-he composition.
Accord.a.ng to one ernbodiment, the composition according to tne invention comprises approximately 0. 5 0 to approximately 5'zl by weight of compQund able to increase viscosity, expressed wirh respect to the total weight of the cottipos ition .
T.ikewise, the viscosity of the composition according to the invention can vary to a great extent, accoraing notably to the nature of the active substances dncx the characteristics of the material inr-o which they must penetrate.
A viscosity range which can be used for tYie aompas-ition accorda.ng to the invention varies from appxoximateiy 2000 to approximately 50,000 millipascal-seconds.
Accord;.ng to one embodiment, the viscosity of the compc.)sition according to the invention varies from approximately 10,000 to approximately 30,000 millzpascal-secands.
The aompositi9n ac.co~-aing to the invention can comprise one c,r more active sL~bstances irztendeci ta penetrate deeply into the material_ These active subsrances can be of different natures.
it rnay be a case for example of 1acquer..
~
It may also be a cas2 of substances intended to effec-~ a specific treatraent of the rrzaterial. Such a treatrnent can cGnsist for example of the aciclition of substarZces, ro.C
zxam~.~le sodiuun caxbonate, increasi nc; 'C he proportion of certain rrietalll c elements, notabl.y certain cations, iri the mazerial.
ozhex active substances coraprise for example hyqrophobic substances, for txample siloyanes, intended to limit thLz penetzation of water ~nto the material.
It rrtay also be a case of substances intended to reinforce che material, such as lithium or sodium silicates.
The active substances can also comprise corrosion inhibiting agents.
Suc:h substances comprise notably f 3.uo.rQp.t-tosphates, for example sodium mono.fluorophospnate, n.itrites, norably calcium or sodium, certain acids, for e~arnple poZytartric ac-I d, zirrc ohelates, ptrosphonates, molybdates dnd art~inoal~ohols such as dimethylethanolamine, ciiethanolamzrres or tra.echanolarnines, as well as rrrixtures comprising at least one of r-he substances menti-oned above.
Accordzng to one embodiment, the composition of the invention comprises only one active substance.
r3~ccordillg to another embodiment, zhe composa-tion of the i nvE'rltlon can cornpr3-se a fTllxtuY'e of several active substances whose ac:tion Un the material may pe ~detlti~al oz^
differerit_ Thus provision can be macte for in'xing, i.n a composita.or4 accorainq ro tlie invention, a substancc for rEinforcing the rnaterial and a co4rasion inhibitor.
The advantage of mixing the treatrnent substarices w-ith a gel is as fol.lnws:
- first of ail, 'che gel, because of its viscosity, makes it possible to apply to the material a very thick coating which cconsequently contains a large quantzty of active substance;
- because of this, each unit surface area of the material to be t.ceateci is in contact with a large quantity of act.-ive substance;
- because of the great ttxickness of the treatment coa.ting formecl by tne gel, the treatment substance contained in this gel is protected against any risk of excessively r-ap.ici evaporation in the air, whicri makes it possible to prQlong the pex-iod of contact of the tx-eazment substance with the mat =4l to be treat.ed.
Gonsequently, by v-Lrtue of the gel which contains the treatmerlt substance, the quantity of active substanca per unit surface area of the material to be treated is -Lncreaaecl, as well as the pex'iod of contact between the substarice and the material to be treated, which considerably increases zhe efficacy of the treatment sLzbstance.
1'he emuisJ-ons described for example in the patent US-5 556 915 can have neither the consistency nor rhe viscosity of a c~el.
It is z1hzrefore riot possible to apply an emujsi,on irl the form of a thick coating to the surface of the material to be Consequentlv, a thirr layer of etnulsion cannot con~cain a large cluanti.ty of treatment substance per Qnit surface area o1 the rndter.iaZ to be treated.
In addition, zr. the case of the ge-I useci -in the method accoz7cling to the invention, only the t:reatrnent substance enters the mater.~al to be treated, af1d the gel, hecause of it.s riI gh viscosity, remai ns on the surface and fo:i7ms Zriereon, after drying, a residue which it is necessary to rernove.
In other words, the gel has an ability firstly to retain a lar-ge quantity of treatme.nt substance and then secondly to release the lazt.ex so that it diffuses into the material.
Qn Lhe other hand, in the case ot an emulsion, a1l of it penetrates the material at the sa.me time as the treatment substarlce_ Consequently, the application of an emulsion contain-tng a zs.eatment substance to the mater.iai to be treated can under no circumstances have the actvaxl'tages procaxed by a gel containing ttie txeatizient substance.
Th(- -Lrjvention also aims to pz-otect a rne-thod for diffELzsing one or more active substances wi.th~n a base material of concrete, cemt-nt, mortar, stont-, stucco or simila.r.
Tt,~~ :ne~: hr) d dccurdinG to the invention, for che dGep d iffu7io;i of one ai_ inore active substances witnin a inateria t.
ba.seLA On Concrete, Cement, mortar, Stone, stucco or samil.ar, comprises the steps consistzng in:
- fo~m ng a gel of one or lttore actzve substances in a viscoelastlc trrass, the said gel being as described previousay, - applying che gel to the surface of the material.
According to the fnethod of the invention, the active sqjDstance or substanrres can be applied to the marer:.al in the dry or wet state_ It is therefore not necessary for the material to underg4, prior to the applicatiQn of the gel, a drying step.
The gel can be appliect to the surface of the material by ciiff ex-ent: methods. These inc.Iude, for example, an application by brush or roller, an app].icatican by spraying or any other method of applying a gel to a surface.
The gel is generally applied to the matezjal at a cuncentr3tion varying between approximately 50 g/m' and approximately 5000 g/m'.
Ac_cording to one emboclirtient, the gel is applied to the rnaterial at a concentration varying between approXa-maCely 500 g/m` and approximately 1500 g/rn E'irially, the invention relates to the use of a gel as a cacrier fo.r: the deep cfiffus~-on of one or more dcta.ve substances in a mater1al based on concrete, mortar, cerrtent, st. r~e, s-cucco or similar.
Accordzng to the ~.nvention, trie clel comprises one or more compounds able to increase viscosity, for exa.mple ce1~ ulos~, agarose, starch, det trane, a guin, and clerivatives and/or rni -nt ures of these substances .
The active substances comprise for example lacquers, addir-ives, reinforcament proclucts, corcosion Inhibitors arid hyds-opho}aic substances.
7'he irlvention will be better l.cnderstood in the following description, c~i ven vvitb referencP to the acco~ztpas~ying f zguxe.
F-igure 1 zs a ourve stiowing the concentration of aGrive substance daffused in a concrete accrording to the depth, usi.ng the gel of example 1.
In Figure 1, curve N 1 shows the results obtained with a convanr-ional treatment composition.
Curve N 2 shows the results obtained with a composition of the invention, and curve N" 3 shows the m-Lnimum acceptable value in 'Cerms of active sub3rance ln the concrete.
CKample 1 A 20% aqueous solution of monof]-uarophosphate was yellect by adding, und.er stz-rring and at room temperature, 2.5b by weigrit carboxymerhylcallulo$e (CMC) in powde.r forIil with a viscosdty of 20,000 ~aillipascal-seconda. This gel was applied by brusti or roller, sprayect or appl.iad by any othez-n~ethod of applying a gel to a surfac:e, at the rate of 1500 q/mI , on the buttress wal1 of a viac3uct heavily contaminated w--th ~h!_or~des_ The gel penetrated fully in approxiir-ately six hours, leaving a sl.igrit residue of CMC which can easily be washed off with watex'.
On an adjoining surface, an appla.cation by spraying of the same aqueous solution of monofluorophosphate - without CMC , was carried out, so as to obtain an applied quantity equivalent to that of Lhe gel. To do this, the monofluorophosphate was sprayed on 15 occasions during a toLal period of 8 hours.
Two days after the treatments, concrete cores were sainpled and analysed in order to define the monofluorophosphate concentration profile according to the depth. The results are shown in Figure 1.
Figure 1 shows tha2 not only does the use of the gel increase the penetration of the cnonofluorophosphate, but that the results are greatly improved.
The monofluorophosphate content is still sufficient at 60 mm in the case of the gel, whilst the conventional application by means of a solution has not made it possible to exceed a usetul depth of 20 mm-Fxample 2 In one litre of watex, 60 grams of starch glue and 1 gram of Praestol polyelectrolyte were dispersed under heavy stirring until a homogeneous mass was obtained. Whilst ma.inta.Lning zhe stirring, 200 grams of inonofluorophosphate were then introduced along with 0.1 grams of TritonTM X100 in order to increase the wettability of the gel.
The qel obtained was applied to the vault of a tunnel, at ~he rate of 1500 grams per m`. At the end of appz.-oximatety 3 days, the sl:rrace of 'i~he concrete showed only a dry residue of starch.
The penetration of the monofluorophosphate into thf~ concrete was measured on a 50 mm cIiameter core anct showed a penetration of approximately 60 mrti.
A conventional application by repeated spray~ng of an aqueous solution of monoflcaorophosphate showed, at an equiv4lent concentrazion, only a penetration of approximately 30 rnrtt.
Example 3 A gel was prepai~ed by mixing under heavy stirring 30 g per litre of water of carboxymethylcellulose, with a viscosity of 80,000 millipa$cal-seconcls. 200 g of nirrite per litre of wazer was then int.-coduced under stirring, until a homogeneous gel was obtained.
'S'he ge1 obtained was correctly dispex-sed and was applied to vertical and overhanging concrete surfaces in order to check adhesion _ More than 1500 g per mz of th1s gel was able to be applied w~thouz runs. The drying and the penetratz.on of the gel into the concrete took place in the same way as with a monofluorosphosphate gel.
~xainple 4 R gel was prepax'ed in the same way as in example 3 above, k~ut re~>lac~ng the nitrite w~-tri an identical quant.ity of 2-~~irnethylam.inoetria.nol .
A hon;ogQneous and wel.l-disper sec! gel was obtained and could be appl.~ed to conc_rete wal1.-- zn tne same way as the gels deccvribed in the previous examples_
Claims (14)
1. A method of treating a material based on concrete, mortar, cement, stone, stucco or like material used in construction, the method, comprising the steps consisting of:
- mixing one or more active substances with a gel;
- applying a continuous coat of the mixture obtained over the entire surface of the material to be treated, characterized in that the said active substances comprise corrosion inhibitors.
- mixing one or more active substances with a gel;
- applying a continuous coat of the mixture obtained over the entire surface of the material to be treated, characterized in that the said active substances comprise corrosion inhibitors.
2. A method according to claim 1, characterized in that the corrosion inhibitors comprise fluorophosphates, nitrites, polytartric acid, zinc chelates, phosphonates, molybdates and amino alcohols as well as mixtures comprising at least one of the above substances.
3. A method according to claim 1 or 2, characterized in that the application is carried out with a brush or roller, or by spraying.
4. A method according to any one of claims 1 to 3, characterized in that the mixture is applied to the material at a concentration varying between 50 g/m2 and 5000 g/m2.
5. A method according to any one of claims 1 to 4, characterized in that the application of the mixture is carried out in one or more steps.
6. A method according to any one of claims 1 to 5, characterized in that the mixture further comprises one or more compounds able to increase the viscosity of the mixture.
7. A method according to claim 6, characterized in that the compounds able to increase the viscosity comprise gums, derivatives and/or mixtures of gums.
8. A method according to claim 6, characterized in that the compounds able to increase viscosity comprise cellulose, derivatives thereof, and/or mixtures of these substances.
9. A method according to claim 6, characterized in that the compounds able to increase the viscosity comprise starch and derivatives and/or mixtures thereof.
10. A method according to claim 6, characterized in that the compounds able to increase viscosity comprise dextrans and derivatives and/or mixtures thereof.
11. A method according to claim 6, characterized in that the compounds able to increase viscosity comprise agarose and derivatives and/or mixtures thereof.
12. A method according to any one of claims 6 to 11, characterized in that the mixture comprises several compounds able to increase viscosity.
13. A method according to any one of claims 1 to 12, characterized in that the mixture comprises 0.1% to 20%
by weight of compound able to increase viscosity, expressed with respect to the total weight of the mixture.
by weight of compound able to increase viscosity, expressed with respect to the total weight of the mixture.
14. A method according to any one of claims 1 to 13, characterized in that the mixture has a viscosity varying between 2000 millipascal seconds and 50,000 millipascal seconds.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR98/14855 | 1998-11-25 | ||
| FR9814855A FR2786177B1 (en) | 1998-11-25 | 1998-11-25 | COMPOSITION FOR THE TREATMENT OF A MATERIAL BASED ON CONCRETE, CEMENT, MORTAR, STONE, STUCCO OR SIMILAR, ITS USES, PROCESS FOR DIFFUSION OF PRODUCTS INSIDE A MATERIAL USING SUCH A COMPOSITION |
| PCT/FR1999/002898 WO2000031001A1 (en) | 1998-11-25 | 1999-11-24 | Method for treating a material based on concrete, mortar or the like |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2352105A1 CA2352105A1 (en) | 2000-06-02 |
| CA2352105C true CA2352105C (en) | 2009-05-12 |
Family
ID=9533181
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002352105A Expired - Fee Related CA2352105C (en) | 1998-11-25 | 1999-11-24 | Method for treating a material based on concrete, mortar or the like |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP1137613B1 (en) |
| JP (1) | JP2002538063A (en) |
| AT (1) | ATE242754T1 (en) |
| AU (1) | AU1280000A (en) |
| CA (1) | CA2352105C (en) |
| DE (1) | DE69908812D1 (en) |
| FR (1) | FR2786177B1 (en) |
| PT (1) | PT1137613E (en) |
| WO (1) | WO2000031001A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005052791B4 (en) * | 2005-11-05 | 2014-03-06 | Bk Giulini Gmbh | Use of monofluorophosphate in aqueous solution as a primer, process for the preparation of plastered walls or ceilings made of concrete with improved adhesion between plaster and concrete surface and the use of plaster of mortar containing monofluorophosphate to improve the adhesion of plaster on concrete surfaces |
| CN106747652B (en) * | 2016-12-13 | 2019-01-11 | 浙江大学自贡创新中心 | Two-component dyes hardening sealant floor material |
| CN106747651B (en) * | 2016-12-13 | 2018-12-14 | 浙江大学自贡创新中心 | The preparation and application method of two-component dyeing hardening sealant floor material |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE498588C (en) * | 1926-03-07 | 1930-05-23 | Canova Marmor Werkstaetten G M | Process for coloring and tinting through stones, in particular crystalline stones such as marble |
| JPH0742180B2 (en) * | 1991-12-20 | 1995-05-10 | 東洋インキ製造株式会社 | Aqueous organosilicon composition |
| KR100470034B1 (en) * | 1995-12-15 | 2005-07-11 | 파마시아 코포레이션 | Methods for improved rheological control in cementitious systems |
-
1998
- 1998-11-25 FR FR9814855A patent/FR2786177B1/en not_active Expired - Fee Related
-
1999
- 1999-11-24 PT PT99956137T patent/PT1137613E/en unknown
- 1999-11-24 CA CA002352105A patent/CA2352105C/en not_active Expired - Fee Related
- 1999-11-24 DE DE69908812T patent/DE69908812D1/en not_active Expired - Lifetime
- 1999-11-24 JP JP2000583830A patent/JP2002538063A/en active Pending
- 1999-11-24 EP EP99956137A patent/EP1137613B1/en not_active Expired - Lifetime
- 1999-11-24 AU AU12800/00A patent/AU1280000A/en not_active Abandoned
- 1999-11-24 WO PCT/FR1999/002898 patent/WO2000031001A1/en active IP Right Grant
- 1999-11-24 AT AT99956137T patent/ATE242754T1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| PT1137613E (en) | 2003-10-31 |
| EP1137613B1 (en) | 2003-06-11 |
| ATE242754T1 (en) | 2003-06-15 |
| DE69908812D1 (en) | 2003-07-17 |
| CA2352105A1 (en) | 2000-06-02 |
| WO2000031001A1 (en) | 2000-06-02 |
| EP1137613A1 (en) | 2001-10-04 |
| FR2786177A1 (en) | 2000-05-26 |
| JP2002538063A (en) | 2002-11-12 |
| AU1280000A (en) | 2000-06-13 |
| FR2786177B1 (en) | 2000-12-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0957071B1 (en) | A method for rehabilitative and/or protective corrosion-inhibition of reinforcing steel embedded in a hardened concrete structure by means of surface-applied corrosion-inhibiting compositions | |
| EP0614860B1 (en) | Corrosion inhibiting composition for reinforced concrete and method of applying same | |
| González et al. | The behaviour of pre-rusted steel in concrete | |
| US6174461B1 (en) | Concrete sealers with migrating corrosion inhibitors | |
| KR100817448B1 (en) | Functional Paint Composition | |
| KR101798953B1 (en) | Mortar composition for repairing and reinforcing concrete structure with superior property of waterproof and rust prevention, and method of repairing and reinforcing concrete structure using the same | |
| KR102184164B1 (en) | Concrete section recovery and concrete surface repair method using inorganic sodium silicate which can heal self | |
| CA2352105C (en) | Method for treating a material based on concrete, mortar or the like | |
| JPH0468272B2 (en) | ||
| JP2017210815A (en) | Conservation method and coating material for reinforced concrete structure | |
| EP0398356A1 (en) | Method of preventing the deterioration of a hardened cement-based mass | |
| WO2003030640A2 (en) | Controlled release microbiocide for porous surfaces | |
| US4802923A (en) | Benefaction of concrete and aggregate using calcium phosphate | |
| JP5514479B2 (en) | Treatment method for comprehensively improving durability of hardened cement body and hardened cement body treated by the method | |
| JP3460974B2 (en) | Coating material having a bactericidal action and a method of repairing a building using the coating material | |
| US9617645B1 (en) | Anti-corrosion and water-repellent substance and method | |
| KR102150952B1 (en) | Inorganic sodium silicate-based permeable concrete waterproofing method for self-healing of cracks | |
| US20080028987A1 (en) | Agent And Uses For Treating And Improving Building Materials, Mineral Mixtures And Mineral Colors, And Corresponding Method | |
| JP7473820B2 (en) | Penetrating Composition | |
| US20190062564A1 (en) | Basic, hydrophobic filler, coating composition containing a filler of this kind | |
| CA1156389A (en) | Anti-corrosion organic polyurethane impregnant coating compositions | |
| WO2023242700A1 (en) | Composition and method of making nano-coat formulation forcorrosion resistance in rebars | |
| CA1097543A (en) | Method for preserving porous inorganic substrates | |
| JPH03275840A (en) | Method and layer for underfloor dampproofing/ant prevention, and composition therefor | |
| RU2165477C2 (en) | Rust modifier of steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20191125 |