WO2023154511A1 - Compositions de traitement topique de nanosilice pour rajeunir du béton détérioré - Google Patents

Compositions de traitement topique de nanosilice pour rajeunir du béton détérioré Download PDF

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Publication number
WO2023154511A1
WO2023154511A1 PCT/US2023/012916 US2023012916W WO2023154511A1 WO 2023154511 A1 WO2023154511 A1 WO 2023154511A1 US 2023012916 W US2023012916 W US 2023012916W WO 2023154511 A1 WO2023154511 A1 WO 2023154511A1
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Prior art keywords
nanosilica
composition
concrete
particles
particle size
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PCT/US2023/012916
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English (en)
Inventor
Jonathan Samuel BELKOWITZ
Mallory Ann WESTBROOK
Samuel James Abraham BELKOWITZ
WhitneyLe BELKOWITZ
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Intelligent Concrete, LLC
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Application filed by Intelligent Concrete, LLC filed Critical Intelligent Concrete, LLC
Priority to AU2023218320A priority Critical patent/AU2023218320A1/en
Publication of WO2023154511A1 publication Critical patent/WO2023154511A1/fr

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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
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/50—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 inorganic materials
    • C04B41/5076—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 inorganic materials with masses bonded by inorganic cements
    • C04B41/5089—Silica sols, alkyl, ammonium or alkali metal silicate 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
    • 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
    • C04B41/4584—Coating or impregnating of particulate or fibrous ceramic material
    • 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
    • C04B41/65—Coating or impregnation with inorganic materials
    • 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
    • C04B2111/72—Repairing or restoring existing buildings or building materials

Definitions

  • the present technology is generally related to compositions for repairing concrete and extending the life of deteriorating concrete structures.
  • a method of treating aging concrete includes successively appling a nanosilica composition to a surface of aging concrete to saturate the concrete and allowing it to dry.
  • the concrete is typically cleaned to remove surface contaminants (salts, paint, rust, and the like), dried, and is then saturated with the composition.
  • the compositions include nanosilica in an aqueous suspension.
  • a first nanosilica composition having a first particle size is applied prior to a second nanosilica composition having a second particle size, wherein the first particle size is larger than the second particle size.
  • a first coated nanosilica composition is applied prior to a non-coated nanosilica composition.
  • the nanosilica composition is for topical treatment on a concrete surface.
  • a nanosilica composition for application to aged concrete includes nanosilica particles in an aqueous suspension and a polymer, wherein the nanosilica particles exhibit a particle size from about 1 nm to about 1000 nm, and the nanosilica particles are present from about 1 wt% to about 50 wt% of the total weight of the composition.
  • the nanosilica particles exhibit a particle size from about 10 nm to about 500 nm.
  • the nanosilica particles have a shape that is spherical, elliptical, cylindrical, irregular, or a combination of any two or more thereof.
  • FIGs. 1A-E are a progressive illustration of how the compositions and methods described herein first penetrate and then cause gelation and maturation to rejuvenate a degraded concrete, according to a variety of embodiments.
  • FIG. 2 is a schematic illustration of the preparation of concrete testing cylinders, according to the examples.
  • FIG. 3 is a schematic illustration of the preparation of concrete testing cylinders, according to the examples.
  • FIG. 4 is a schematic illustration of the preparation of concrete testing cylinders with different coatings, according to the examples.
  • FIG. 5 is a schematic illustration of the preparation of concrete testing cylinders, according to the examples.
  • FIG. 6 is a graph of soaking results/times for a reference, a concrete sample with microcracking, and a concrete sample with a full crack, according to the examples.
  • FIG. 7 is a graph of soaking in water only between the uncoated reference and the concrete sample coated with Composition 1 at a rate of 125 sq. ft. per gallon, according to the examples.
  • FIG. 8 is a graph of soaking in a sodium chloride solution (8 wt% solids content) for an uncoated reference sample and a sample coated with Composition 3 at a rate of 125 sq. ft. per gallon, according to the examples.
  • FIG. 9 is an overlay of both FIG. 7 and 8.
  • FIG. 10 is a photograph of a concrete tunnel illustrating the effects of treating (right side) with the compositions described herein versus no treatment (left side), according to the examples.
  • FIG. 11 is a photograph of light cracking in concrete.
  • FIG. 12 is a photograph of moderate concrete degradation.
  • FIG. 13 is a photograph of extensive concrete degradation.
  • FIGs. 14A and 14B are photographs of concrete joints in an underground tunnel, where 14A is an untreated section of the joint and 14B is a treated section of the joint, at 4 months post treatment.
  • FIG. 14C is a graph comparing water absorption data after 4 months.
  • FIGs. 15A and 15B are photographs of concrete joints in an underground tunnel, where 15A is an untreated section of the joint and 15B is a treated section of the joint, at 4 months post treatment.
  • FIG. 15C is a graph comparing water absorption data after 4 months.
  • FIGs. 16A and 16B are photographs of concrete joints in an underground tunnel, where 16A is an untreated section of the joint and 16B is a treated section of the joint, at 4 months post treatment.
  • FIG. 16C is a graph comparing water absorption data after 4 months.
  • FIG. 17 is a photograph illustrating the impact of using the nanosilica compositions of the present application (right side) at 18 hours post-treatment, compared to no treatment (left side), according to the examples.
  • a composition for penetrating and rejuvenating older and deteriorating concrete structures.
  • the composition is a hydrogel composition includes a nanosilica solution that is a topical treatment that penetrates deep into concrete pores, bridges existing cracks, and alters the pores from future transmission and deposition by water, salts, and other contaminants.
  • the result is a concrete structure that has the capacity to last 30-50% longer, compared to concrete structures that are untreated with the hydrogel. See FIG. 1 for an illustration.
  • older and deteriorating concrete may be determined through visual examination by the appearance of cracks, or when the concrete is observed to secreting salts, water, rust, or any combination thereof. It is at any stage of deterioriating or cracking that the concrete is sufficiently degraded to benefit from treatment with the described compositions.
  • the nanosilica solution is intended to add to the deteriorated backbone of concrete strength.
  • a reaction occurs producing calcium hydroxide.
  • Calcium hydroxide while generated during concrete formation, is also harmful to the structure resulting in deterioration of the concrete, due to the subsequent formation of large crystals of calcium hydroxide.
  • the nanosilica solution reacts with the calcium hydroxide and other salts in the cement.
  • a nanosilica-based hydrogel is formed that bridges pores and cracks in the concrete, thereby forming a stronger, denser concrete, and reducing further deleterious effects on the concrete from water and contaminant migration.
  • the hydrogel itself fills voids within the concrete to mitigate percolation through the structure, increasing the resilience of concreate to further deterioration, and, in effect, increasing the service life of the concrete.
  • the nanosilica compositions rejuvenate the concrete by bridging microcracking in the structures, and stems or abates further cracking or microcracking due to water, salt, and contamination migration into the concrete.
  • the nanosilica solution may be employed as a replacement for concrete sealers, in conjunction with concrete sealers and paints, and may be applied as a spray-on technology.
  • the concrete structure to be sprayed with composition is first cleaned to remove surface coatings and debris.
  • the cleaning of the surface may include pressure washing, hammering and chiseling to remove loose material, scrubbing, and the like.
  • the composition is then sprayed onto the surface of the concrete until the concrete is saturated. This is normally done in successive coats at an application rate of 1000 to 250 sq. ft. per gallon. The more the concrete is deteriorated, the greater the amount of the composition that is required.
  • the nanosilica composition is added until the concrete will not accept any more nanosilica solution (when the surface no longer dries), up to about 125 ft. 2 per gallon.
  • a composition comprising nanosilica in an aqueous solution that is configured to be sprayed or otherwise applied onto, and thereby penetrate into, a concrete surface thereby rejuvenating, reducing the permeability, and strengthening the concrete toward degradation from physical and chemical attack.
  • the nanosilica composition reacts with calcium hydroxide and other salts and contaminants in the concrete, thereby neutralizing it and sequestering it from further damaging the concrete.
  • This phased development process also creates a hydrogel that contains the same strength bearing compositions that would be found in the hydrated cementitious matrix of the cracked concrete composite.
  • the nanosilica has a particle size from about 1 nm to about 1000 nm.
  • the particle size distribution of the nanosilicas used can range from small nanosilica particles with narrow distributions of 1-3 nm, 3-5 nm, 6-8 nm, 10-12 nm, 17-19 nm and wide distributions of 3-10 nm, 3-20 nm, 5-20 nm and other variation of these narrow and wide particle size distributions.
  • the particle size distribution of the nanosilicas used can range from large nanosilica particles with narrow distributions of 45-47 nm, 50-55 nm, 70-75 nm, and wide distributions of 3-100 nm, 50-75 nm, 100-500 nm and other variation of these narrow and wide particle size distributions.
  • the nanosilica particles in the nanosilica may have a variety of shapes from spherical, elliptical, cylindrical, and irregular.
  • the type of shape used is normally spherical for the embodiments but particle size changes to elliptical or elongated as the particles become larger. This change in particle shape can be beneficial in different embodiments to promote reduction in permeability through particle-to-particle packing, pore blocking, and hydrogel-development.
  • the nanosilica may be present in the composition over a range of concentrations.
  • the solids content of the nanosilica can range from 50% solids and below.
  • the pH of the nanosilica can range from acidic (less than 4 and up to 7), neutral (7), to basic (7 and above). The pH of these nanosilica topical treatments without additions listed above should not exceed 10.7.
  • the nanosilica particles may also be coated with other materials that may provide other properties to the compositions.
  • coated nanosilica particles such as, but not limited to, alumina modified nanosilica
  • alumina modified nanosilica is believed to react more slowly with the calcium hydroxide in the concrete thereby allowing for deeper penetration as it is carried into the concrete structure.
  • the coatings may induce other reactions besides just the neutralization of the calcium hydroxide.
  • other reactions include, but are not limited to, the alumina modified nanosilica reacting to form calcium alumina silicate hydrate and calcium-silica-hydrate.
  • Illustrative coatings include, but are not limited to, alumina.
  • the nanosilica particles can be non-modified surfaces that are stabilized in solution with sodium oxide, potassium oxide and other forms of salts that create an electrical double layer at the surface of the particle.
  • Other embodiments include nanosilica-sized particles stabilized with: alumina, lithia, silica, and then stabilized with a salt such as sodium oxide. There may be multiple modifications on one nanosilica-sized particle.
  • the blends may include other solvents such as glycol ethers (glymes), alcohols, ketones, and other hydrophilic solvents, polycarboxylates, hydrophobic emulsions, or hydrophillic emulsions.
  • glycol ethers glycol ethers
  • ketones ketones
  • hydrophilic solvents polycarboxylates
  • hydrophobic emulsions hydrophillic emulsions.
  • compositions may be polymer modified, include surfactants, silicates, hydrophobic materials, degreasers, dispersants, and stabilizers for the nanosilica to include.
  • Illustrative polymers include, but are not limited to polycarbonates, poly(meth)acrylates, glycol ethers, poly-carboxylates comb polymers, and the like.
  • Other additives may include graphene, carbon nanotubes, nano alumina, nano titanium dioxide, and nano copper.
  • the additive may be present from about less than 1 wt% to below 50 wt% of the total weight of the composition.
  • compositions of nanosilica are for application to aging concrete in which some degradation has already progressed due to the buildup of other species within the concrete, such as calcium hydroxide, chlorides, sulfates, alkalis, carbonation, cracking from repetitive use, and other physical and chemical attack mechanisms.
  • the compositions are intended for use on concrete where degradation may be nearly imperceptible to the eye, to structures where hairline cracks may have appeared, to those where underlying steel or other supporting or reinforcing structures have become visible.
  • the compositions of the present application provide restorative benefits in all stages of degradation of the concrete.
  • compositions may be sprayed on, rolled on, or poured on the concrete. From time zero, when the composition is applied to the deteriorated concrete, the nanosilica combines with pore water.
  • pore water is the resident water within concrete that is located within the porous concrete structure in pores and cracks. The pore water typically contains soluble alkalis and other concrete degradation products that react with the nanosilica compositions and additive to initiate and continue the rejuvenation process within the aging concrete.
  • the nanosilica and additive consume the soluble alkali (and other contaminants, if present in the cementitious pore water solution) to generate a hydrogel within the concrete, thereby bridging the concrete pores and cracks at the surface, subsurface (i.e. a region immediately within the concrete structure), and within the remaining body of the concrete. Over time, the branched hydrogel matures, gaining in size and rigidity through polymerization of the silica particles.
  • the process of applying the compositions to the concrete structure may include a variety of stages.
  • the surface may be prepared for application of the composition.
  • Such surface preparation may include removal of loose concrete, washing of the surface to remove debris or other contaminants such as salts, oils, paints, grease, lichens, moss, etc.
  • the surface of the concrete may then be saturated with water to a saturated surface dry condition for the concrete before application of the nanosilica composition.
  • the composition may then be applied to the surface of the concrete in successive applications at a rate of about 5000 square feet per gallon (“sfpg”) to about 10 sfpg.
  • This may include from about 4000 sfpg to about 10 sfpg, from about 3000 sfpg to about 10 sfpg, from about 2500 sfpg to about 10 sfpg, from about 1000 sfpg to about 10 sfpg, from about 5000 sfpg to about 50 sfpg, from about 2500 sfpg to about 50 sfpg, from about 1000 sfpg to about 50 sfpg, from about 5000 sfpg to about 100 sfpg, from about 2500 sfpg to about 100 sfpg, from about 1000 sfpg to about 100 sfpg, from about 5000 sfpg to about 250 sfpg, from about 2500 sfpg to
  • the number of applications in succession may also vary depending on the degraded state of the concrete and the penetration of the composition into the concrete.
  • the composition may be applied at least one time. This may include from 1 to 100 successive applications, from 1 to 50 successive applications, from 1 to 10 successive applications, from 3 to 100 successive applications, from 3 to 50 successive applications, or from 3 to 10 successive applications.
  • the size of the colloidal particles, the size distribution of the colloidal particles, the coating of the colloidal particles, and the presence of polymers and additives to the compositions all impact the rate of penetration of the composition into the concrete. Generally, larger and/or coated particles or compositions with polymeric additive penetrate more slowly, but due to slower reaction rates, they penetrate more deeply. Accordingly, such compositions are generally applied first.
  • Small or uncoated nanosilica particles or those compositions with lesser additives or no polymer additive are applied later to react more quickly at the surface of the concrete putting a finishing on the surface.
  • coated nano nanosilica particle may be used.
  • an alumina modified nanosilica colloidal dispersion may be used in combination with a standard nanosilica, or by itself, for a concrete that has been attacked and deteriorated by alkali-silica reactions, deicing salts, and/or brines.
  • Example 1 A series of blends of nanosilica in water were prepared. Various parameters were changed for each of the blends. Such variables include the particle size distribution of the nanosilica particles, the shape of the nanosilica particles, coating layers on the nanosilica particles, additives to the blend, and the amount of solids in the blend.
  • the blends may be prepared in a variety of vessels with a variety of agitation mechanisms.
  • the vessel may be a transportation vessel, a low shear mixer, a high shear mixer, an ultrasonic mixer.
  • the agitation mechanism may be a stirring paddle, or motion of the vessel itself by physical shaking, spinning, or vibration.
  • the addition of supplemental materials and agitation is to be adjusted such that the nanosilica and blended dispersion is not destabilized.
  • destabilized nanosilica will precipitate from the suspension and for a multi-phasic suspension instead of a homogenous suspension.
  • Example 2 Test results. The tests were conducted to evaluate a blend of the compositions of Example 1 with simulated cement pour solutions to determine appropriate mixing ratios. These were used to simulate what will happen when the composition hit the concrete and mix with the cement pour solution. Table 1 illustrates the penetration resistance of several blends of the compositions and cement pour mixtures, where the data is based upon measurements according to ASTM C403.
  • Example 3 Ten concrete cylinders of the same concrete composition were cast and cured. The concrete composition is as according to the following Table, where the “Later” column will be for future testing. [0050] Each of the ten cylinders was then cut into three equal cylinders (FIG. 2). Each of the samples was then saw cut on all faces and opposing sides of the cylinder to mimic damage/cracking of the concrete (FIG. 3). All surfaces of the sample, except the bottom face, were then coated with a marine grade, epoxy (FIG. 4). Test samples were prepared for testing as shown in FIG.
  • compositions listed above may be used in the following situations with regard to concrete degradation to rejuvenate the concrete.
  • Compositions such as those illustrate by Composition 1 may be used in concrete applications where there is light cracking, with minimal gel and salt leaching from cracks in the concrete.
  • Compositions such as those illustrate by Composition 2 may be used in may be used in concrete applications where there is moderate to excessive cracking, possibly rust and/or salt emerging from the cracks and joints.
  • Compositions such as those illustrate by Composition 3 may be used in may be used in concrete applications where there is moderate to excessive cracking, rust, and salt emerging from the cracks and joints, and general deterioration of the concrete.
  • FIG. 6 is a graph of soaking results/times for a reference sample and a sample with a manufactured crack. Where the concrete sample was saw-cut and then fitted back together to create a “crack” that has a, average-width of 0.03 inch (0.78 mm).
  • FIG. 7 is a graph of soaking in water only between the uncoated reference sample and the sample coated with Composition 1. As shown, the water absorption into the concrete is substantially slowed in the Composition 1 -coated sample as compared to the control.
  • FIG. 8 is a graph of soaking in a sodium chloride solution (8% solids by mass) for an uncoated reference sample and a sample coated with Composition 1 and Composition 3. As shown, the sodium chloride solution absorption into the concrete is substantially slowed in the Composition 3 sample as compared to the control.
  • Example 4 A concrete tunnel was then tested with the Composition 1, and a photo is shown as FIG. 10.
  • the left side shows an untreated, cut-out crack in the tunnel, while the right side of the cut-out crack was treated with the Composition 1.
  • the treated side shows little to no water seepage, while the un-treated side shows substantial seepage.
  • FIGs. 14A and 14B (treated with Composition 1) and FIGs. 15A and 15B (treated with Composition 2) are different sections in the same tunnel at different joint sections, where the treated sections (i.e. FIGs. 14B and 15B) showed marked improvement in resistance to seepage.
  • the treatment as at a rate of 125 sq. ft/gallon.
  • FIGs. 14C and 15C are graphic illustrations of water absorption data, where the absorption for the treated sections is improved over untreated sections. The figures are all at four months post- topical treatment with the nanosilica compositions.
  • FIGs. 16A and 16B (treated with Composition 3) is a further different section in the same tunnel at different joint sections, where the treated section (i.e. FIG. 16B) showed marked improvement in resistance to seepage.
  • the treatment as at a rate of 250 sq. ft/gallon.
  • FIG. 16C graphically illustrates water absorption data, where the absorption for the treated sections are improved over untreated sections.
  • FIG. 17 is a full view of the tunnel that was treated, 18 hours after topical treatment with the nanosilica compositions. The right side of the tunnel was treated and shows marked improvement compared to the left side that was untreated.
  • a method of treating aging concrete includes successively applying a composition to a surface of aging concrete, wherein the composition comprises nanosilica in an aqueous suspension.
  • Para. 2 The method Para. 1, wherein the composition further comprises a polymer.
  • Para. 3 The method of Para. 1 or 2, wherein the nanosilica exhibits a particle size from about 1 nm to about 1000 nm.
  • Para. 4 The method of any one of Paras. 1-3, wherein the nanosilica exhibits a particle size from about 10 nm to about 500 nm.
  • Para. 5 The method of any one of Paras. 1-4, wherein the nanosilica particles have a shape that is spherical, elliptical, cylindrical, or irregular.
  • Para. 6 The method of any one of Paras. 1-5, wherein the nanosilica is present in the composition from about 1 wt% to about 50 wt% of the total weight of the composition.
  • Para. 7 The method of any one of Paras. 1-6, wherein the nanosilica particles are coated.
  • Para. 8 The method of Para. 7, wherein the nanosilica particles are at least partially coated with alumina.
  • Para. 9 The method of any one of Paras. 1-8, wherein the aqueous suspension further comprises a solvent, surfactant, silicate, hydrophobic material, degreaser, dispersant, stabilizer, polymer, carbon nanotube, graphene, or a combination of any two or more thereof.
  • Para. 10 The method of any one of Paras. 1-9, wherein a first nanosilica composition having a first particle size is applied prior to a second nanosilica composition having a second particle size, wherein the first particle size is larger than the second particle size.
  • Para. 11 The method of any one of Paras. 1-10, wherein a first coated nanosilica composition is applied prior to a non-coated nanosilica composition.
  • Para. 12 The method of any one of Paras. 2-11, wherein the polymer is a polycarbonate, a poly(meth)acrylate, a glycol ether, a poly-carboxylate comb polymer, or a mixture of any two or more thereof.
  • Para. 13 The method of any one of Paras. 1-12, wherein the aqueous suspension further comprises a solvent comprising a glycol ether, alcohol, ketone, or a combination of any two or more thereof.
  • a nanosilica composition for application to aged concrete comprising nanosilica particles in an aqueous suspension and a polymer, wherein the nanosilica particles exhibit a particle size from about 1 nm to about 1000 nm, and the nanosilica particles are present from about 1 wt% to about 50 wt% of the total weight of the composition.
  • Para. 15 The nanosilica composition of Para. 14, wherein the nanosilica particles exhibit a particle size from about 10 nm to about 500 nm.
  • Para. 16 The nanosilica composition of Paras. 14 or 15, wherein the nanosilica particles have a shape that is spherical, elliptical, cylindrical, irregular, or a combination of any two or more thereof.
  • Para. 17 The nanosilica composition of any one of Paras. 14-16, wherein the nanosilica particles are coated.
  • Para. 18 The nanosilica composition of Para. 17, wherein the nanosilica particles are at least partially coated with alumina.
  • Para. 19 The nanosilica composition of any one of Paras. 14-18, wherein the polymer is a polycarbonate, a poly(meth)acrylate, a glycol ether, a poly-carboxylate comb polymer, or a mixture of any two or more thereof.
  • Para. 20 The nanosilica composition of any one of Paras. 14-19, wherein the aqueous suspension further comprises a solvent comprising a glycol ether, alcohol, ketone, or a combination of any two or more thereof.

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Abstract

L'invention concerne un procédé de traitement du béton âgé, détérioré et corrodé qui comprend l'application successive d'une composition sur une surface de béton vieillissant, la composition comprenant de la nanosilice dans une suspension aqueuse.
PCT/US2023/012916 2022-02-14 2023-02-13 Compositions de traitement topique de nanosilice pour rajeunir du béton détérioré WO2023154511A1 (fr)

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KR101094721B1 (ko) * 2011-06-22 2011-12-16 박상익 콘크리트 구조물의 원형 복원 보수 모르타르 및 보수 보강 공법
JP2015110715A (ja) * 2013-11-11 2015-06-18 勇 畠 コンクリート用コーティング剤

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