KR-20260064870-A - Exterior wall defect reinforce composition for exposed concrete structure and exterior wall defect reinforcing method for exposed concrete structure using thereof

Abstract

According to the present invention, an exposed concrete exterior wall repair finish is provided, comprising a mortar mixture in which rapid-hardening cement, magnesia cement, and artificial silica sand powder are mixed in a volume ratio of 3:2:1; and a penetrating mixture in which 40-60 parts by weight of cyclopropanol, 30-50 parts by weight of isobutylene, 30-50 parts by weight of ethanol, 20-40 parts by weight of 2-bromobutane, 20-40 parts by weight of hydroxyacetic acid, 10-30 parts by weight of acrylonitrile, 5-10 parts by weight of acrylic flame retardant, and 90-110 parts by weight of water are mixed with 100 parts by weight of a silane complex, wherein the mortar mixture and the penetrating mixture are mixed in a volume ratio of 5:10 to 7:10.

Inventors

• 김애자
• 장호연

Assignees

• 김애자
• 장호연

Dates

Publication Date

20260508

Application Date

20241030

Claims (2)

1. A mortar mixture comprising rapid-hardening cement, magnesia cement, and artificial silica sand powder mixed in a volume ratio of 3:2:1; A penetrating mixture comprising 100 parts by weight of a silane complex mixed with 40-60 parts by weight of cyclopropanol, 30-50 parts by weight of isobutylene, 30-50 parts by weight of ethanol, 20-40 parts by weight of 2-bromobutane, 20-40 parts by weight of hydroxyacetic acid, 10-30 parts by weight of acrylonitrile, 5-10 parts by weight of an acrylic flame retardant, and 90-110 parts by weight of water, An exposed concrete exterior wall repair finishing agent characterized by a mortar mixture and a penetrating mixture mixed in a volume ratio of 5:10 to 7:10.
2. Includes an exposed concrete exterior wall repair finish according to Paragraph 1, A step in which pretreatment work is performed on the surface of a substrate having cracks and reinforcement areas of an exposed concrete exterior wall, and An exposed concrete exterior wall repair and finishing method characterized by including a step in which the above-mentioned exposed concrete exterior wall repair and finishing agent is applied to the surface of the base surface to form a finishing layer.

Description

Exterior wall defect reinforcement composition for exposed concrete structure and exterior wall defect reinforcing method for exposed concrete structure using thereof The present invention relates to an exposed concrete exterior wall repair finishing agent and an exposed concrete exterior wall repair finishing method using the same. More specifically, the invention relates to an exposed concrete exterior wall repair finishing agent and an exposed concrete exterior wall repair finishing method using the same, wherein a repair finishing agent comprising a mixture of a mortar mixture and a penetrating mixture is applied to an aged portion of an exposed concrete exterior wall to improve the physical performance and waterproofing of the finishing layer through excellent adhesion and penetration. Exposed concrete is an architectural form that uses the inherent color and texture of the concrete itself for the finish. It emphasizes the unique beauty and grandeur of the concrete by exposing the concrete in its raw state after the formwork is removed following pouring. These concrete structures undergo physical and chemical deformation over their service life due to various natural or artificial forces after construction, leading to a decline in physical performance. Furthermore, if aging accelerates, expansion pressures caused by rebar corrosion, freeze-thaw cycles, and carbonation can result in cross-sectional defects in the concrete structure, posing risks to safety in terms of aesthetics, structural strength, and functionality. Consequently, there has been a recent increase in efforts to restore safety and functionality by carrying out repairs to ensure the safety and performance of concrete structures; however, most repair finishing agents for concrete primarily use Portland cement-based mortar. Here, conventional repair finishing agents for concrete are, for example, manufactured into mortar by adding CSA (calcium sulfoaluminate) or a latex-based material and adding a predetermined fine powder binder, and are classified into aluminate-based mortar with CA and CA2 as the main component, calcium fluoroaluminate-based mortar with C11A7 and CaF2 as the main component, and sub-primary-based mortar with CSA as the main component, based on the reaction point of Ettringite, an expansive material obtained from the chemical reaction between cement and water, and the constituent minerals that exhibit rapid hardening properties. However, aluminate-based mortars have the problem that after the hydration reaction, the product transitions into a secondary hydrate that exhibits low strength, making them unstable in the long term and particularly vulnerable to calcium chloride, which can lead to a decrease in durability performance. In addition, while calcium fluoroaluminate-based and sub-primary mortars offer superior performance, they may not be economical due to the need for a separate calcination process and the additional step of grinding into fine powder. In addition, most mortars produced using the alkali-activated substances mentioned above are fast-setting rather than ultra-fast-setting, and since it takes at least one day for strength to develop after mixing with water, they are difficult to apply to emergency construction projects that require rapid construction (e.g., road repair, bridge repair, or construction in water-contacted areas during the winter). For this reason, ultra-fast setting mortars are being manufactured and used by the cement industry using previously developed alumina cement and jet cement to overcome the problem regarding the strength development time of mortars. However, due to the nature of repair mortars used in exposure to the external environment, there is a problem in that desired characteristics related to mortar quality, such as durability (freeze-thaw, carbonation, etc.), ambient temperature (drying shrinkage, etc.), compressive strength, and adhesion strength, cannot be obtained. In addition, since most repair agents or finishing agents used for repairing conventional concrete structures primarily consist of mortar, they fail to penetrate deeply into cracks or pores in the concrete, resulting in reduced adhesion and waterproofing properties. Hereinafter, embodiments of the present invention will be described in detail. First, the exposed concrete exterior wall repair finish according to an embodiment of the present invention comprises a mortar mixture in which rapid-hardening cement, magnesia cement, and artificial silica sand powder are mixed in a predetermined volume ratio, and a penetrating mixture in which cyclopropanol, isobutylene, ethanol, 2-bromobutane, hydroxyacetic acid, acrylonitrile, an acrylic flame retardant, and water are mixed in a predetermined weight part of a silane complex, and the mortar mixture and the penetrating mixture are mixed in a predetermined volume ratio. More preferably, the exposed concrete exterior wall repair finish according to an embodiment of the pr