KR100974675B1 - Method for manufacturing repairing protection mortar for preventing deterioration and repairing protection mortar manufactured by this method - Google Patents

Abstract

PURPOSE: A manufacturing method of a repairing/protecting mortar, and the repairing/protecting mortar manufactured thereby are provided to extend the lifetime of a construction structure by manufacturing a mortar with the improved matter properties. CONSTITUTION: A manufacturing method of a repairing/protecting mortar for preventing the neutralization and deterioration of a concrete structure comprises a step of mixing a hybrid aqueous emulsion and a micro mortar in a ratio of 20:100~25:100. The micro mortar is formed by the following steps: mixing portland cement and micro cement to make a first mixture; mixing the first mixture with calcium aluminum sulfite and anhydrous gypsum to make a second mixture; mixing the second mixture with silica; and mixing am antifoaming agent and titanium dioxide.

Description

TECHNICAL MANUFACTURING REPAIRING PROTECTION MORTAR FOR PREVENTING DETERIORATION AND REPAIRING PROTECTION MORTAR MANUFACTURED BY THIS METHOD}

The present invention relates to a repair protection mortar manufacturing method for preventing deterioration and neutralization of concrete structures, and a repair protection mortar prepared by the same, and more specifically, can be obtained through an environmentally friendly material and a simple manufacturing method as a repair material, and have excellent characteristics. In accordance with the present invention relates to a method of manufacturing a repair protection mortar for preventing and neutralizing concrete structures applicable to the maintenance of concrete structures exposed to poor environmental conditions, and a repair protection mortar manufactured through the same.

As the social demands of concrete structures increase, durability and durability issues are recognized as important issues. In particular, the construction industry of Korea began to build a large amount of construction structures in a relatively short period of time in accordance with the high economic growth policies of the national economy since the 1970s. Civil structures have also been expanded. As these construction structures deteriorate over time due to various external factors and their aging, structural safety is highlighted as a social problem, and measures are required to cope with it. However, the re-establishment causes cost burdens and many social problems.

In addition, in the case of reinforced concrete structures, which have been mass-constructed under the concept of existing new ground ground, the structural safety is the first priority, while considering the aging change of materials according to the surrounding environmental conditions in the absence of guidelines, manuals and systems on durability and maintenance. As a result, there is a problem in that maintenance costs due to cracking and deterioration of durability due to corrosion of reinforcing bars are incurred, and major reinforced concrete structures (Seohae Bridge, Overpass, Incheon) that have a target life of more than 100 years. Airports, port facilities, nuclear power plants, etc.) are exposed to very harsh environments (salt and neutralization), so it is necessary to improve durability by promptly establishing effective maintenance measures on the basis of scientific and engineering technologies, and also in domestic construction. Technology is world class but engineering and maintenance Due to the relatively weak liquor, the proportion of building maintenance among the building demand is currently about 26.7%, but it is expected to reach about 40% in 2015, so that the development of efficient and eco-friendly alternative materials for the maintenance of the structure is difficult. There is an urgent need.

      Furthermore, the current new technology and repair reinforcement methods are designed mainly for reinforcement mortars, but in the case of such protection mortars, it is true that the functions for preventing deterioration and neutralization are insufficient. 'S performance is so severe that it is indistinguishable from ordinary lamination.

The present invention has been made to solve the problems of the prior art as described above, as having a high quality characteristics in durability, chemical resistance, adhesiveness, etc. as a repair material, it is possible to extend the life of the construction structure to reduce the cost of maintenance and environmentally friendly materials It is an object of the present invention to provide a method for manufacturing a repair protection mortar for preventing degradation of concrete structures and neutralization through use, and a repair protection mortar manufactured therefrom.

      In order to achieve the above object, the present invention is characterized by consisting of a reaction of mixing a hybrid water-soluble emulsion and micro mortar in a ratio of 20: 100 to 25: 100.

      One of the materials used in the reaction is a hybrid water-soluble emulsion, comprising the steps of dispersing potassium silicate and silica fume powder in water, polymerizing the siliconate and methoxy silane in the acrylic emulsion polymer, methylcellulose thickener (methylcellulose Lloyd's), the fluidizing agent (melamine system) and the anti-foaming agent is mixed and stirred, characterized in that it comprises the step of mixing the product of each step (However, the step of dispersing, polymerizing, mixing and stirring) The order of does not matter if the order is changed.)

      Wherein the hybrid water-soluble emulsion is 0.33 to 1 parts by weight of potassium silicate, 0.33 to 1 parts by weight of silica fume powder, 5 to 7 parts by weight of acrylic emulsion polymer, 0.33 to 1 parts by weight of silicon, based on 8.33 to 12 parts by weight of water, methoxy It is characterized by consisting of 0.16 to 0.4 parts by weight of silane, 0.01 to 0.6 parts by weight of a thickener, 0.03 to 0.1 parts by weight of a fluidizing agent and 0.03 to 0.1 parts by weight of an antifoaming agent.

      Micro mortar, which is another one of the materials used in the reaction, mixes portland cement and micro cement to produce a first mixture, and mixes CAS (Calcium Aluminum Sulfite) and anhydrous gypsum to the first mixture. To produce a step, to produce a third mixture by mixing the silica sand No. 5, the silica sand No. 6 to the second mixture, characterized in that it is prepared by mixing the mortar defoamer, titanium dioxide in the third mixture.

      Wherein the micro mortar is 1.5 to 4.15 parts by weight of micro cement, 1.5 to 4.15 parts by weight of CAS (Calcium Aluminum Sulfite), 1.5 to 4.15 parts by weight of anhydrous gypsum, 12 to 16.5 parts by weight of silica sand 28 to 33 parts by weight of silica sand 6, 0.08 to 0.42 parts by weight of the defoaming agent and 0.4 to 0.83 parts by weight of titanium dioxide.

As described above, the repairing protection mortar manufacturing method for the purpose of preventing the deterioration and neutralization of the concrete structure according to the present invention and the repairing protection mortar prepared by the same by the hybrid water-soluble emulsion which is a component as compared to the conventional repairing mortar Concrete structure with excellent chemical resistance and durability, compact structure, breathable by micro mortar, but prevents the ingress of rain and moisture from outside, and high quality protection mortar with excellent waterproofing performance, while satisfying KS F 4042 conditions It has the effect of being a repair polymer cement mortar.

       In addition, constituent potassium silicate is an odorless, pollution-free, eco-friendly material, which is an alkaline natural raw material, which prevents and sterilizes bacteria and molds that are harmful to the human body to prevent environmental pollution and protects durability. It has the characteristics of mortar.

       Furthermore, it can be used for the maintenance of various concrete buildings exposed to poor environment because of its excellent properties such as adhesiveness, and can effectively preserve such buildings for a long time.

Hereinafter, a repair protection mortar for preventing concrete structure deterioration and neutralization according to the present invention will be described.

      Repair protection mortar manufacturing method and repair protection mortar for preventing concrete structure degradation and neutralization according to the present invention consists of a reaction of mixing a hybrid water-soluble emulsion and micro mortar in a ratio of 20: 100 ~ 25: 100.

      One of the materials used in the reaction is a hybrid water-soluble emulsion, comprising the steps of dispersing potassium silicate and silica fume powder in water, polymerizing the silicate and methoxy silane in the acrylic emulsion polymer, thickener (methylcellulose) and Mixing and stirring the fluidizing agent (melamine system) and the antifoaming agent, and mixing the products of the respective steps (however, the order of the steps does not matter if the order is changed back and forth),

     Wherein the hybrid water-soluble emulsion is 0.33 to 1 parts by weight of potassium silicate, 0.33 to 1 parts by weight of silica fume powder, 5 to 7 parts by weight of acrylic emulsion polymer, 0.33 to 1 parts by weight of silicon, based on 8.33 to 12 parts by weight of water, methoxy 0.16 to 0.4 part by weight of silane, 0.01 to 0.6 part by weight of thickener, 0.03 to 0.1 part by weight of fluidizing agent, and 0.03 to 0.1 part by weight of antifoaming agent.

      Micro mortar, which is another one of the materials used in the reaction, mixes portland cement and micro cement to produce a first mixture, and mixes CAS (Calcium Aluminum Sulfite) and anhydrous gypsum to the first mixture. Comprising a step of producing a third mixture by mixing the silica sand No. 5, the silica sand No. 6 in the second mixture, the mortar defoamer and titanium dioxide in the third mixture.

Here, the micro mortar is 1.5 to 4.15 parts by weight of micro cement, 1.5 to 4.15 parts by weight of CAS (Calcium Aluminum Sulfite), 1.5 to 4.15 parts by weight of gypsum, 12 to 16.5 parts by weight of silica sand, It consists of 28-33 weight part of silica sand 6, 0.08-0.42 weight part of antifoamers, and 0.4-0.83 weight part of titanium dioxide.

      The acrylic emulsion polymer is intended to provide stability to water resistance, compressive strength, tensile strength, adhesion strength, chemical resistance, ultraviolet rays, etc., as a maintenance mortar to prevent miscibility with each material, deterioration of concrete structures, and neutralization. Is an odorless, pollution-free, eco-friendly material, which is an alkaline natural raw material, which prevents and sterilizes harmful bacteria and fungi, and has excellent weatherability, durability, and flame retardancy, and penetrates into inorganic materials such as concrete and brick As a result, the chemical bonds serve to further strengthen the strength of water-repellent protection. In addition, the silicone confers the flammability and water repellency of the repair protective mortar, and the methoxysilane is for improving the adhesiveness, tensile strength, flexural strength, compressive strength, and workability of the repair protective mortar. Silica fume powder is a nano-sized powder having a single particle size of 100 to 200 nm to improve the watertightness and strength of the water-repellent mortar, and the antifoaming agent, dispersing agent and thickener are added to impart a function as known in the art. .

       In the following, the physical properties of the concrete structure manufactured according to the present invention will be examined through the performance evaluation of the repair protection mortar for preventing deterioration and neutralization.

1. Performance evaluation test

1) Chloride ion penetration resistance test

   Chloride ion penetration resistance test is to comply with the requirements of KS F 2711.

2) Water vapor permeability test a) Preparation of test body

The size of the repair protection mortar test piece according to the present invention is made into a circular shape having a diameter of 150 mm, and the test piece is weighed at a temperature of 23 ± 2 ° C. and a relative humidity of 50 ± 10%.

B) Test method

 ① Installation of the test piece is as follows.

a) Add more than 100g of desiccant (CaCl ₂ ) to the bottom of the container. At this time, the surface of the moisture absorbent is made smooth.

  b) Install the specimen in the container. The specimens shall then be oriented in accordance with the intended use of the material.

  c) Apply the specified sealant to the part of the specimen outside the moisture permeable range (Ø100mm) and seal it out of the moisture permeable range.

  d) Install the specimen by the same method without adding the absorbent to the test container. This is called a blank container.

NOTE In case the specimen sags downward, the surroundings may be sealed with aluminum tape to prevent the sealing from falling off.

 ② Measurement

The measurement is made in the following order.

 a) Place the vessel with the specimen in a constant temperature and humidity chamber set at a temperature of 23 ± 2 ° C and a relative humidity of 50 ± 2%.

 b) All tests are corrected by measuring the mass increase and decrease of the blank container and subtracting from the moisture permeation obtained in a).

 c) The measurement interval shall be the time during which the increase in specimen moisture permeation is in the range of 0.01 to 10 g. The amount of increase in mass converted per hour is determined from the difference between the mass of the measured vessel and the mass of the vessel measured immediately before. This increase is measured at least five times in succession, and the test is terminated when the mass of the test vessel is constantly increased for at least 2 intervals (48 hours).

3) Calculation of the result The calculation of the measurement result is as follows.

 a) Calculate the moisture permeability according to the following formula.

Q = │W _n -W _{n + 1} │

Q: moisture permeation (g)

W _n : Mass (g) of the test container containing the test piece at the nth mass measurement

W _{n + 1} : Mass (g) of the test container including the test piece at the n + 1th mass measurement

 b) Calculate the moisture permeability according to the following formula and round it up to one decimal place.

M =

M: water vapor permeability (g / m ² · day)

: 마지막으로 측정된 투습량 (g)

: Last measured moisture permeation (g)

: 투습면적 (0.00785m²)

: Breathable Area (0.00785m ² )

: 마지막의 질량측정과 그 1회 앞의 질량 측정과의 시간간격

Is the time interval between the last mass measurement and the previous mass measurement.

4) Permeability test

A) Test body production

   The test specimen is made by curing the protective mortar uniformly without bubbles.

B) test method

In the water permeability test, the test body is fixed to the permeation test apparatus, and a pressure of 0.1 N / mm ² is applied for 1 hour. After applying water pressure, remove the test specimen from the test apparatus, wipe it lightly with two kinds of filter paper specified in KS M 7602 for about 10 seconds, and then divide the center of the test specimen into two parts and observe whether water is wetted by the water.

5) Attachment strength test

   The test body is cured evenly after the repair protection mortar is bubble-free, and then exposed to the specified deterioration conditions (after the hot and cold repeated test, after the alkali resistance test).

6) Neutralization Resistance Test

A) Introduction Based on BS EN 13295, EN 1062-6.

B) principle

After applying the protective mortar, the carbonation depth (d _k ) and the carbon dioxide permeation resistance were measured. In this experiment, CO2 permeation rate and equivalent air layer thickness were used as a coefficient for evaluating the permeation resistance of carbon dioxide. The amount of carbon dioxide permeation is expressed as the amount of carbon dioxide transmitted per day (g / m 2 · d) through the square meter area of the coating material by the difference of the constant partial pressure or concentration. The carbon dioxide equivalent air layer thickness is defined as the thickness (m) of the floating air layer which has the same conditions of carbon dioxide permeability as the coating material. Therefore, it is evaluated that the larger the value of S _D, the better the carbon dioxide permeation resistance.

C) Reason for introducing carbon dioxide permeability test

  In Korea, carbon dioxide resistance test is carried out through the accelerated carbonation test specified in KS F 2584, and the carbonation resistance is measured by measuring the neutralization depth at 1,4,8,13,26 weeks after exposure. In the case of obtaining the carbonation rate coefficient through the conventional method, there is a possibility that deviations may occur depending on the tester when measuring the penetration depth due to phenolphthalein spray, and it is difficult to accurately evaluate the time point when carbonation progresses. On the other hand, the calculation of the equivalent air layer thickness is a method of estimating the CO2 diffusion coefficient in a material, which has the advantage that the test can be continuously conducted with one specimen without destroying the specimen to measure the penetration depth. (m) has the advantage that the carbonation resistance of the material can be more clearly understood.

D) carbon dioxide permeability test method

① Prepare and cure 100mm × 100mm × 400mm concrete test specimens according to EN 1766, and apply and cure repair protection mortar according to KS F 4042.

② After leaving the specimen under standard condition for 24 hours, expose carbon dioxide concentration to 10% at (60 ± 10)% and (21 ± 2) ℃.

③ Expose the coated surface of the test object to the measuring gas and measure the carbon dioxide absorption. Seal the test cell and the test cell containing the absorbed carbon dioxide so that the gas does not leak around the cell. The measuring cell keeps dry carbon dioxide at atmospheric temperature 23 ± 2 ℃ and checks the weight every 24 hours.

④ CO2 permeability is calculated by weight increase. If the weight gain is less than 5 mg between two measurements. Extend the measurement interval. The test is completed when the weight gain of the test cell remains unchanged in two successive measurements.

⑤ For the purpose of adjusting the measured value, measure the reference film (standard material) that knows CO2 permeability together with each successive measurement.

E) experimental results

  The carbon dioxide permeation amount i is calculated using the following formula (1a) or formula (1b), and the unit is g / (m 2 · d).

수식(1a)

Formula (1a)

d _m : difference between two weights in the periodic change of weight (before and after weight difference) (g)

K ₁ : factor that converts a day into time; K ₁ = 24;

K ₂ : factor that converts 10% (V / V) into c; K ₂ = 10;

t : measurement time as a continuous degree of transmission, h

A : test object area, ㎡

c :% of carbon dioxide concentration in test gas (V / V)

P _amb : Ambient atmospheric pressure, kPa

P : Factor that converts kilopascals to 1 bar in P _amb , P = 100

A simple expression (1a) is the expression (1b).

수식(1b)

Formula (1b)

Equivalent air layer thickness S _{D is} calculated using equation (2) and equation (3), and the unit is m.

수식(2)

Formula (2)

수식(3)

Formula (3)

D _CO2 : CO2 diffusion coefficient in air according to day and area (㎡)

| △ c | : The difference between the concentration of carbon dioxide in the general atmosphere and the concentration of carbon dioxide in the air under test (kg / ㎥)

K ₃ : factor converting g into kg; K ₃ = 1000

NOTE: CO2 0% (V / V) to 10% (V / V) | △ c | For CO2 concentration differences, D _CO2 · | Δ c | at a test temperature of 23 ° C and 100 kPa air pressure. = 248, and S _D of the 10% (V / V) concentration difference is the same as that of Equation (4).

수식(4)

Formula (4)

2. Performance evaluation result

 Performance evaluation result The concrete repair protection mortar according to the present invention was evaluated to satisfy the quality test of KS. In particular, through the above data, the concrete repair mortar according to the present invention was evaluated to satisfy the quality standards of KS F 4042 (repair protection mortar) and to have durability against salt, freeze-thawing, visible light, neutralization, etc., which are concrete degradation factors.

Claims (6)

 It is made by mixing the hybrid water-soluble emulsion and micro mortar from 20: 100 to 25: 100, The micro mortar is, Mixing the portland cement and the micro cement to produce a first mixture;  Generating a second mixture by mixing CAS (Calcium Aluminum Sulfite) and anhydrous gypsum to the first mixture;  Producing a third mixture by mixing silica sand 5 and silica sand 6 with the second mixture; Mixing the antifoaming agent, titanium dioxide in the third mixture; Method of producing a repair protection mortar for preventing concrete deterioration and neutralization characterized in that it is prepared.  The method of claim 1,  The hybrid water-soluble emulsion,  Dispersing potassium silicate and silica fume powder in water;  Polymerizing the siliconate and methoxy silane into an acrylic emulsion polymer;  Mixing and stirring a thickener, a glidant, and an antifoaming agent;  Mixing the product of each step; Method of producing a repair protection mortar for preventing concrete deterioration and neutralization characterized in that it is prepared.  The method of claim 2, The hybrid water-soluble emulsion,  0.33 to 1 part by weight of potassium silicate, 0.33 to 1 part by weight of silica fume powder, 5 to 7 parts by weight of acrylic emulsion polymer, 0.33 to 1 part by weight of siliconate, and 0.16 to 0.4 part by weight of methoxysilane, based on 8.33 to 12 parts by weight of water. , 0.01 to 0.6 parts by weight of a thickener, 0.03 to 0.1 parts by weight of a fluidizing agent and 0.03 to 0.1 parts by weight of an antifoaming agent. delete  The method of claim 1,  The micro mortar is,  1.5 to 4.15 parts by weight of microcement, 1.5 to 4.15 parts by weight of CAS (Calcium Aluminum Sulfite), 1.5 to 4.15 parts by weight of gypsum, 12 to 16.5 parts by weight of silica sand, 12 to 16.5 parts by weight of silica sand ~ 33 parts by weight, defoamer 0.08 ~ 0.42 parts by weight and titanium dioxide 0.4 ~ 0.83 parts by weight of the method for producing a repair mortar for preventing concrete deterioration and neutralization. Repair mortar for preventing concrete deterioration and neutralization characterized in that it is prepared according to any one of claims 1, 2, 3 and 5.