KR-102959436-B1 - Crack Repair Method Using an Acrylic-Based Backside Water Barrier Waterproofing Agent

Abstract

The present invention relates to a crack repair method using an acrylic back-surface waterproofing agent having a penetration verification function, wherein the composition is configured to include a fluorescent marker that reacts to ultraviolet (UV) or infrared (IR) light to confirm whether the waterproofing agent has properly penetrated into the crack through UV or IR irradiation, and furthermore, by including a temperature-responsive viscosity modifier that automatically adjusts viscosity considering the temperature difference according to the depth of the crack, the waterproofing agent is induced to effectively reach deep inside the crack and prevent excessive flow on the surface. The method comprises: a step of generating Solution A (S100) for producing Solution A (polymer crosslinking composition) comprising acrylamide, boric acid, methylenebisacrylamide, acrylic acid, ammonium persulfate, and hydroxyethyl methacrylate; and a step of producing Solution B (inorganic reaction stabilizer) comprising polyvinyl alcohol, acrylic acid, magnesium hydroxide, sodium persulfate, and lithium silicate. The method comprises: a generation step (S200); a C-liquid formation step (S300) for manufacturing a C-liquid (shrinkage-reducing composite) containing hollow ceramic particles and expandable polystyrene microparticles; a waterproofing agent composition step (S400) for forming a waterproofing agent composition that induces shrinkage reduction during the curing process by first mixing the A-liquid and C-liquid and then adding a B-liquid to the mixture; an auxiliary agent addition step (S500) for adding a fluorescent pigment or an ultraviolet (UV) reaction marker to the waterproofing agent composition; a crack injection step (S600) for applying or injecting the waterproofing agent composition into the surface or interior of a concrete structure where cracks have occurred; and a penetration confirmation step (S700) for non-destructively confirming whether penetration into the crack occurs through ultraviolet (UV) or infrared (IR) irradiation using the fluorescent pigment or UV reaction marker added to the waterproofing agent composition.

Inventors

• 신현수
• 김해중
• 권경혁
• 안지현
• 구근우
• 신설화
• 오순란
• 권미화

Assignees

• (주)썬시카티앤씨
• 주식회사 씨엠글로벌

Dates

Publication Date

20260507

Application Date

20250725

Claims (6)

1. A step of producing Solution A (polymer crosslinking composition) comprising acrylamide, boric acid, methylenebisacrylamide, acrylic acid, ammonium persulfate, and hydroxyethyl methacrylate (S100); a step of producing Solution B (inorganic reaction stabilizer) comprising polyvinyl alcohol, acrylic acid, magnesium hydroxide, sodium persulfate, and lithium silicate (S200); a step of forming Solution C (shrinkage-reducing composite) comprising hollow ceramic particles and expandable polystyrene microparticles (S300); a step of forming a waterproofing agent composition that induces shrinkage reduction during the curing process by first mixing Solution A and Solution C, and then adding Solution B to the mixture (S400); a step of adding an auxiliary agent (S500) that adds a fluorescent pigment or a UV reaction marker to the waterproofing agent composition; and applying or injecting the waterproofing agent composition onto the surface or interior of a cracked concrete structure. A crack repair method using an acrylic back-surface waterproofing agent comprising: a crack injection step (S600); and a penetration confirmation step (S700) for non-destructively confirming whether penetration into the crack occurs through ultraviolet (UV) or infrared (IR) irradiation using a fluorescent pigment or ultraviolet reaction marker added to the waterproofing agent composition, wherein The above auxiliary agent addition step (S500) comprises adding a fluorescent pigment or a UV-reactive marker to the waterproofing agent composition in a range of 0.01 to 0.5 weight%, wherein the marker comprises at least one of a nano fluorescent material, a luminescent pigment, or an iridium complex. The above crack injection step (S600) includes a crack cleaning step (S610) for pre-removing air or moisture inside the crack using vacuum suction equipment before injecting the waterproofing agent composition; and a composition injection step (S620) for injecting the waterproofing agent composition deep into the cleaned crack using a low-pressure pump or gravity flow method to induce improved injection efficiency and penetration depth. A crack repair method using an acrylic-based back-wall waterproofing agent having a penetration verification function, characterized in that the penetration verification step (S700) above comprises non-destructively detecting whether penetration has occurred into the interior of the crack through ultraviolet (UV) or infrared (IR) irradiation after crack repair using visual inspection or sensor equipment.
2. In paragraph 1, A crack repair method using an acrylic-based back-surface waterproofing agent having a penetration confirmation function, wherein in the above waterproofing agent composition step (S400), the waterproofing agent composition can be stored in a powder state for a long period and then dissolved in water to be restored to a liquid state on-site, and after curing, possesses excellent adhesion and water resistance, and realizes complete penetration into the crack and crack blocking effects.
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6. In paragraph 1, The above waterproofing agent composition step (S400) includes adding a temperature-responsive viscosity modifier to the waterproofing agent composition in a range of 0.1 to 2.0 weight%, and A crack repair method using an acrylic back-surface waterproofing agent having a penetration confirmation function, wherein the viscosity modifier is composed of one or more mixtures of poly(N-isopropylacrylamide), hydrogel copolymer, or siloxane-based temperature-sensitive polymer, and exhibits the characteristic that viscosity decreases in a low-temperature environment of 5 to 15°C to increase flowability into deep cracks, and viscosity increases in a high-temperature environment of 20°C or higher to suppress surface flow, thereby self-detecting the temperature difference according to crack depth and changing the viscosity, so that it effectively infiltrates deep into the crack and minimizes surface leakage.

Description

Crack Repair Method Using an Acrylic-Based Backside Water Barrier Waterproofing Agent with Penetration Verification Function The present invention relates to a crack repair method for effectively addressing cracks occurring in buildings and civil engineering structures. More specifically, the invention relates to a crack repair method using an acrylic back-surface waterproofing agent having a penetration verification function, wherein an acrylic-based waterproofing composition with excellent shrinkage reduction and long-term storage properties is manufactured, and a fluorescent marker reacting to ultraviolet (UV) or infrared (IR) light is included in the composition to allow verification of whether the waterproofing agent has properly penetrated into the crack through UV or IR irradiation. Furthermore, by including a temperature-responsive viscosity modifier that automatically adjusts viscosity by considering the temperature difference according to the depth of the crack, the invention induces the waterproofing agent to effectively reach deep into the crack and prevents excessive flow on the surface. Typically, cracks in concrete structures occur during construction or use due to external and internal environmental factors, such as various external forces, vibrations, temperature changes, and ground settlement. These cracks serve as pathways for moisture to penetrate the interior of the structure, potentially causing serious structural damage including rebar corrosion, freeze-thaw expansion, salt damage, and alkali-aggregate reaction. This can significantly reduce the structural stability and lifespan. Therefore, prompt repair work after cracks occur is essential to maintain the durability and waterproofing performance of the structure. For example, regarding technology related to putty, a construction adhesive, Registered Patent Publication No. 10-2091977, titled "Method for Repairing and Protecting Concrete Exterior Walls by Restoring Neutralization of Concrete Exterior Wall Surfaces," the technology comprises the following steps: a step of chipping the cross-section of a concrete structure requiring repair or reinforcement until an undamaged portion is exposed; a step of applying a reactive calcium silicate solution obtained by dissolving calcium hydroxide and silicate in water to the trimmed concrete cross-section; a step of curing so that C-S-H (calcium silicate hydrate) crystals and calcium carbonate crystals are formed by reacting with the lime components of the existing concrete as water evaporates from the applied reactive calcium silicate solution; a step of applying a silicate solution obtained by dissolving silicate in water to the concrete structure; a step of curing so that C-S-H (calcium silicate hydrate) crystals are formed by reacting with calcium carbonate crystals as water evaporates from the applied silicate solution; and on the cross-section of the concrete structure The method comprises the steps of: mixing a high-strength repair mortar composition, prepared by mixing a filler and an aggregate with a binder obtained by mixing rapid-setting cement, Portland cement, gypsum, and calcium nitrite, with water and applying it; and applying an elastic putty containing aerogel to the surface on which the mortar composition has been applied. According to the aforementioned prior art, the repair and reinforcement method for the cross-section of a concrete structure allows for the recovery of strong alkalinity due to C-S-H crystals and calcium carbonate formed within the pores of the cross-section and surface of the concrete structure after chipping, without the need for separate curing time or traffic blockage. Furthermore, the repeated dissolution and regeneration of C-S-H crystals through the natural action of rainfall and drying densifies the internal pores and improves salt and acid resistance, thereby having the effect of restoring the physical properties of the concrete itself. Another similar technology is disclosed in Registered Patent Publication No. 10-2559620, "Composition of putty for construction," which consists of a mixture of carbon nanotubes, a fluorine-based resin, an acrylic emulsion, and a rubber emulsion. The prior art in question includes carbon nanotubes and fluorine-based resins, thereby providing excellent elasticity, strength, tensile strength, and adhesion, which can prevent peeling from the painted surface of a building and improve elasticity or durability in response to temperature changes. Additionally, by further including acrylic emulsion and rubber emulsion, excellent water resistance is exhibited, and it can be applied to various construction sites such as exterior waterproofing, ceiling waterproofing, or interior waterproofing. Furthermore, since it substantially does not contain volatile organic compounds or organic solvents, it can provide an environmentally friendly product. Meanwhile, epoxy-based or polyurethane-based injection waterproofing agents are mainl