KR100306056B1 - A permeablility polymer composition for concrete structures and a manufaturing method thereof - Google Patents

Abstract

PURPOSE: Provided is an infiltrating polymer composition for reinforcing concrete construction, which is easily infiltrated and unified into the concrete construction, and protects the concrete construction by using a stainless steel wire mesh. CONSTITUTION: The composition comprises 71.3-88.2wt.% of portland cement, 7.9-10.9wt.% of calcium-sulfo-aluminate(C-S-A) cement to accelerate hardening, 1.0-4.0wt.% of silica fume, 1.0-4.0wt.% of fly ash to prevent cracking, 0.5-2.0wt.% of anhydrous gypsum for solidification, 1-4wt.% of expansive agent, 0.2-1.4wt.% of water-reducing agent, 0.1-1.1wt.% of thickener, and 0.1-1.3wt.% of infiltrating rust preventer.

Description

Permeable polymer composition for reinforcing concrete structures and its manufacturing method {A PERMEABLILITY POLYMER COMPOSITION FOR CONCRETE STRUCTURES AND A MANUFATURING METHOD THEREOF}

The present invention relates to a permeable polymer composition for reinforcing concrete structures and a method of manufacturing the same, which are integrated with existing concrete using a stainless steel wire mesh, and which can easily penetrate the concrete structure and protect the concrete structure being neutralized.

Concrete structures, which were considered to be semi-permanent structures, have suffered from the deterioration of durability and load capacity of concrete structures due to the passage of cargo and work vehicles over design loads and harmful environment to concrete.

Therefore, when a concrete structure is predicted to be deteriorated or deteriorated, or if there is an error in safety from the results of safety diagnosis and inspection, a concrete maintenance and reinforcement plan should be established to improve the performance of the structure. The service life is secured by increasing the number of years of service.

However, according to the safety diagnosis report after the collapse of Seongsu Bridge and the disaster of Sampoong Department Store, most concrete structures that have been used for 10 years have been deteriorated such as cracks and corrosion of rebars. Necessity is emerging.

Conventional repair materials and reinforcement methods using epoxy are mostly used in Japan or Germany, and the verification procedure was ignored, and due to the lack of data on the scope and limitations of the characteristics of each process. The adverse effect of repair and reinforcement has occurred, which is a problem.

This resulted in a contradictory result of the maintenance goal of extending the life of the structure, which further accelerated the aging of the structure, resulting in significant economic losses. In addition, repair and reinforcement are not performed in a timely manner, and the service life of structures that can be improved even with relatively low cost is being shown.

In light of these circumstances, existing repairs have been made to select appropriate repair materials and reinforcement methods according to the type, behavior, type of materials, use environment, and deterioration damage of structures in order to secure usability and safety. In-depth research on materials, repair and reinforcement methods and the development of new construction methods are required.

In addition, conventionally, to repair and reinforce the concrete structure, the concrete structure was reinforced and repaired using cement mortar of the same material as the concrete structure. Separation phenomenon with the existing concrete structure caused the cement mortar for reinforcement falls from the existing concrete structure, there was a problem that can not be expected to reinforce and repair the concrete structure.

In order to solve this problem, in recent years, an epoxy resin is used to reinforce a concrete structure. However, since the elastic modulus of the epoxy resin and the concrete structure is different, an interface separation phenomenon occurs at the interface between the concrete structure and the epoxy resin. There was a problem that can not reinforce the concrete structure.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a permeable polymer composition for reinforcing concrete structures that are in close contact with concrete structures using stainless steel wire mesh and easily penetrated into concrete structures, and a method of manufacturing the same. It is.

Another object of the present invention is to provide a penetrating polymer composition for reinforcing concrete structures and a method of manufacturing the same, which protects the concrete structure to be neutralized and can be integrated with the concrete structure.

In order to achieve the above object, the permeable polymer composition for reinforcing concrete structures of the present invention has a general Portland cement of 71.3 to 88.2 weight, 7.9 to 10.9 weight calcium-sulfo-aluminate cement, and 1.0 to 4.0 weight Silica fume, 1.0 to 4.0 weight fly ash, 0.5 to 2.0 weight anhydrous gypsum, 1 to 4.0 weight expansion material, 0.2 to 1.4 weight reducing agent, 0.1 to 1.1 weight thickener, It is characterized by containing a permeable rust inhibitor of 0.1 to 1.3 weight.

In addition, the method for producing a permeable polymer composition for reinforcing concrete structures of the present invention is a general Portland cement of 71.3 to 88.2 weight, 7.9 to 10.9 weight calcium-sulfo-aluminate cement, and 1.0 to 4.0 weight silica fume And 1.0 to 4.0 weight fly ash, 0.5 to 2.0 weight dry gypsum, 1 to 4.0 weight expander, 0.2 to 1.4 weight reducing agent, 0.1 to 1.1 weight thickener, 0.1 It is characterized by equally mixing the permeable rust inhibitor of weight to 1.3 weight.

1 is a compressive strength measured by preparing a test piece in a standard mortar and a test piece cured in water and the compressive strength of the test piece prepared in the air by using a permeable polymer mortar using the permeable polymer composition for reinforcing concrete structures of the present invention. Compressive strength is measured by age.

2 is a circuit configuration diagram of an applied voltage cell manufactured according to ASTM in order to perform a salt penetration test.

<Description of the symbols for the main parts of the drawings>

1: power supply 2: data logger

3: sodium hydroxide container 4: sodium chloride container

5: Test piece

Hereinafter, various embodiments of the present invention will be described in detail.

Example 1

Common Portland Cement 71.3 Weight

Calcium-sulfo-aluminate (C-S-A) 10.9 weight

Silica Fume 4.0Weight

Fly ash 4.0 weight

Anhydrous gypsum 2.0 weight

Inflator 4.0 weight

Reducing agent 1.4 weight

Thickener 1.1 weight

1.3 weight of penetration rust inhibitor

The components were mixed evenly in the air to prepare a permeable polymer composition for reinforcing concrete structures of the present invention.

A base concrete test piece having a width × length × height of 60 × 60 × 10 cm by mixing 14 weights of the permeable polymer composition for reinforcing concrete structures, 53 weight of sand, and 33 weight of Portland cement containing such components, having a diameter of 10 A circular plate test piece having a height of 4 cm and a cylindrical mold test piece having a diameter of 10 cm and a height of 20 cm and a cubic test piece having a width × length × height of 5 × 5 × 5 cm were fabricated, and physical properties were tested as described below. And durability test.

In other words, the permeable polymer composition for reinforcing concrete structures according to an embodiment of the present invention in order to enhance the adhesion and durability, etc. to reinforce the concrete structure 23 to 48 weight Portland cement, 33 to 63 weight sand To determine the physical properties of the permeable polymer mortar for reinforcement by preparing a permeable polymer mortar using a permeable polymer composition (14 per cent to 24 weight permeable polymer composition for reinforcement of concrete structure prepared by one embodiment of the present invention). Physical properties test (compressive strength, adhesion strength, thermal expansion coefficient) and durability test (permeability test, salt penetration test, neutralization promotion test, resistance test against chemical solution) were measured and evaluated according to the method described below. It was.

Example 2

Common Portland Cement 79.3 Weight

9.9 weight of calcium-sulfo-aluminate (C-S-A)

Silica Fume 3.0 Weight

Fly ash 3.0 weight

Anhydrous gypsum 1.0 weight

Inflator 3.0 weight

0.4 weight of water reducing agent

Thickener 0.1 weight

0.3 wt.

The components were mixed evenly in the air to prepare a permeable polymer composition for reinforcing concrete structures of the present invention.

A base concrete test piece having a width × length × height of 60 × 60 × 10 cm by mixing 24 weights of the permeable polymer composition for reinforcing concrete structures, 63 weights of sand, and 23 weights of Portland cement containing such components, and having a diameter of 10 A circular plate test piece having a height of 4 cm and a cylindrical mold test piece having a diameter of 10 cm and a height of 20 cm and a cubic test piece having a width × length × height of 5 × 5 × 5 cm were fabricated, and physical properties were tested as described below. And durability test.

In other words, the permeable polymer composition for reinforcing concrete structures according to an embodiment of the present invention in order to enhance the adhesion and durability, etc. to reinforce the concrete structure 23 to 48 weight Portland cement, 33 to 63 weight sand To determine the physical properties of the permeable polymer mortar for reinforcement by preparing a permeable polymer mortar using a permeable polymer composition (14 per cent to 24 weight permeable polymer composition for reinforcement of concrete structure prepared by one embodiment of the present invention). Physical properties test (compressive strength, adhesion strength, thermal expansion coefficient) and durability test (permeability test, salt penetration test, neutralization promotion test, resistance test against chemical solution) were measured and evaluated according to the method described below. It was.

Example 3

Common Portland Cement 88.2 Weight

Calcium-sulfo-aluminate (C-S-A) 7.9 weight

Silica Fume 1.0 Weight

Fly ash 1.0 weight

Anhydrous gypsum 0.5 weight

Inflator 1.0 weight

0.2 weight reduction agent

Thickener 0.1 weight

0.1 wt.

The components were mixed evenly in the air to prepare a permeable polymer composition for reinforcing concrete structures of the present invention.

A base concrete test piece having a width × length × height of 60 × 60 × 10 cm by mixing 14 weights of the penetrating polymer composition for reinforcing concrete structures, 53 weight of sand, and 33 weight of Portland cement containing such components, and having a diameter of 10 A circular plate test piece having a height of 4 cm and a cylindrical mold test piece having a diameter of 10 cm and a height of 20 cm and a cubic test piece having a width × length × height of 5 × 5 × 5 cm were fabricated, and physical properties were tested as described below. And durability test.

In other words, the permeable polymer composition for reinforcing concrete structures according to an embodiment of the present invention in order to enhance the adhesion and durability, etc. to reinforce the concrete structure 23 to 48 weight Portland cement, 33 to 63 weight sand To determine the physical properties of the permeable polymer mortar for reinforcement by preparing a permeable polymer mortar using a permeable polymer composition (14 per cent to 24 weight permeable polymer composition for reinforcement of concrete structure prepared by one embodiment of the present invention). Physical properties test (compressive strength, adhesion strength, thermal expansion coefficient) and durability test (permeability test, salt penetration test, neutralization promotion test, resistance test against chemical solution) were measured and evaluated according to the method described below. It was.

In Examples 1 to 3, if the content of the ordinary portland cement is 88.2 or more weight, it becomes general cement mortar, deteriorating freezing and thawing resistance, and also lowering the durability, and conversely, the content of the ordinary portland cement is 71.3 weight or less. On the other hand, the adhesive strength is poor and the cohesion deteriorates, which is not preferable. If the content of calcium-sulfo-aluminate, which acts as a curing accelerator, is 10.9 weight or more, it hardens too quickly, resulting in poor workability, and the content of calcium-sulfo-aluminate is high. If it is 7.9 weight or less, expandability will worsen and curability will deteriorate.

And, if the content of silica fume is 4.0 weight or more, it becomes high-strength concrete, and the strength is too strong to be broken, and if the content of silica fume is less than 1.0 weight, the strength is too low, which is undesirable, and the fly ash used as a crack preventing material. If the content is more than 4.0 weight, there is a fear that the strength is falling, if the content of the fly ash is less than 1.0 weight is not preferable because there is a fear of cracking.

In addition, if the content of the anhydrous gypsum to solidify is more than 2.0 weight, the expandability is good, but the solidification action is increased is not desirable, if the content of the anhydrous gypsum is less than 0.5 weight, the solidification of the concrete is delayed, the content of the expansion agent is 4.0 If it contains more than the weight, the adhesive strength is too strong, poor workability, and if the content of the swelling agent is 1.0 weight or less, there is a risk of cracking, which is not preferable.

Compressive strength test of permeable polymer mortar

The permeable polymer mortar made according to the mixing ratio as described above was prepared by demonstrating 5 × 5 × 5 cm cubic test specimens, demolding after 1 day, air curing (curing in air), and then 1, 3, 7 After days and 28 days, the compressive strength was measured according to Korean Industrial Standard KS L5105. In addition, the specimens prepared in the same method was cured underwater (cured in water), and after 3 days, 7 days and 28 days of age, the compressive strength was measured, and the strength characteristics according to the different curing methods were compared. On the other hand, the elastic modulus was calculated by KS F2405.

Adhesion Strength Test

In order to investigate the adhesion between the permeable polymer mortar and the existing concrete using the permeable polymer composition for reinforcing the concrete structure according to an embodiment of the present invention, a test body having a compressive strength of about 500 kg / cm 2 and 60 X 60 X 60 cm was manufactured. Permeable polymer mortar was then applied to a thickness of 5 mm. After that, three attachments each of 4 × 4 cm size were attached at 7 and 28 days of age, and the adhesive strength test was carried out. The test method was carried out in accordance with the adhesion test methods of KS F4715 (wall finishing material for thin finish), JIS A6909 (thin layer finish paint material), and JIS A6910 (layer finish paint material).

Adhesive strength test after construction of stainless steel wire mesh

Adhesion between a permeable polymer mortar (hereinafter referred to as a permeable polymer composition) using the permeable polymer composition for reinforcing concrete structures of the present invention in a state reinforced with stainless steel wire mesh disclosed in Korean Patent Application No. 98-232 In order to investigate the test specimen, 60 x 60 x 10 cm was made by making concrete with a compressive strength of about 500 kg / ㎠. Thereafter, the test piece was coated with a permeable polymer mortar using a permeable polymer mortar using the permeable polymer composition for reinforcing concrete structures according to an embodiment of the present invention to a thickness of 15 mm, and the size of the 4 x 4 cm at 7 days and 28 days. Three attachments were attached to each other and carried out according to the adhesion test method of KS F4715 (light finish wall coating material), JIS A6909 (thin layer finish paint material), and JIS A 6910 (double layer finish paint material).

Thermal expansion coefficient test

ASTM D696 (Standard Test Method for Coeficient of LinearThermal Expansion) by making test specimens of 2.54 cm x 2.54 cm and 28,575 cm lengths, respectively, using mortar made from portland cement (hereinafter referred to as standard mortar) and permeable polymer mortar. of Plastics) and KS F2424 length change test (dial gauge method).

Compressive strength of permeable polymer mortar and standard mortar

Three kinds of test specimens were prepared using the permeable polymer mortar prepared at the above-mentioned compounding ratio, and cured in air and in water.The test specimens of standard mortar (usually mortar made using portland cement) were prepared and cured in air. Compressive strength was measured for days, 3 days, 7 days and 28 days. The average result is shown in Table 1, and is shown in FIG.

Table 1

Classification 1 day 3 days 7 days 28 days Standard Maltar (Aquaculture) - 189 267 317 Permeable Polymer Maltar 221 286 326 418 Permeable Polymer Maltar (Aquatic) 226 318 334 425

Compressive strength is the most basic physical property in understanding the overall physical properties of materials for repair and reinforcement of concrete structures. Therefore, it is important to consider the characteristics of strength expression. Table 1 shows the compressive strength of the standard mortar and the permeable polymer mortar according to the age and curing method. The compressive strength was better than the standard mortar, and the strength was stably developed with increasing age. The strength was about 420 kg / cm 2. On the other hand, the modulus of elasticity of the permeable polymer mortar was 4.2 x 10 ⁵ kg / cm 2.

In the results of the compressive strength according to the curing method, the compressive strength of the air curing was slightly smaller at the beginning of curing, and the compressive strength of the underwater curing was slightly higher as the age was increased, but overall regardless of the curing method. It showed stable intensity expression. Therefore, it was found that spraying water at the initial stage of the air permeation of the permeable polymer mortar is effective in enhancing the strength.

Adhesion Strength of Permeable Polymer Mortar

In order to repair damaged concrete sections, repair materials for repairing sections are generally excellent in adhesiveness with existing concrete, and should have sufficient characteristics to fully integrate the behavior with existing concrete and suppress the occurrence of interfacial cracks. Most important of all.

In order to determine the adhesive strength of the permeable polymer mortar using the permeable polymer composition for reinforcing concrete structures of the present invention, the base concrete test specimen having a compressive strength of 500 kg / cm 2 and an adhesive strength of about 47 kg / cm 2 was normally maintained in the wet state in the air. Prepared using Portland Cement.

After that, the standard mortar and the permeable polymer mortar were applied to a thickness of 5 mm and then subjected to an adhesive strength test on the 28th day of age. In summary, in the case of standard mortar, the adhesive strength was about 14 kg / cm 2, whereas the adhesive strength of the permeable polymer mortar was about 31 kg / cm 2. On the other hand, in the case of reinforcing with stainless steel, the adhesive strength in the case of standard mortar was about 14 kg / cm 2, and the adhesive strength of the permeable polymer mortar was about 27 kg / cm 2. The case where stainless steel reinforcement is slightly smaller than that of unreinforced steel is due to insufficient mortar filling on the lower surface of stainless steel. Could know.

Thermal expansion coefficient of standard mortar and permeable polymer mortar

An important factor of the thermal properties of concrete repair materials is that the coefficient of thermal expansion should be the same as that of existing concrete to prevent cracking due to thermal expansion at the interface with the existing concrete.In order to investigate this, the standard mortar usually manufactured using portland cement is used. After the test piece was prepared using and a permeable polymer mortar, the thermal expansion coefficient was measured after 28 days of age. In summary, the thermal expansion coefficient of the standard mortar was 9.8 × 10 ⁻⁶ / ° C., and the thermal expansion coefficient of the permeable polymer mortar was 10.2 × 10 ⁻⁶ / ° C.

Looking at the table, the coefficient of thermal expansion of the standard cement mortar is about 9.8 X 10 ^-6 / ℃, and in the case of permeable polymer mortar is about 10.2 X 10 ^-6 / ℃ almost the same coefficient of thermal expansion as the standard cement mortar have. Therefore, it can be seen that it is stable against the change of temperature during the repair of the existing concrete structure due to the permeable polymer mortar.

Durability Test of Permeable Polymer Mortar

Reinforced concrete structures are commonly used in harsh environments, and their durability is greatly reduced due to the penetration of chloride and carbon dioxide, side effects with toxic chemicals, temperature, and climate change. It causes problems with the safety of the structure. The deterioration of the durability of concrete structures means the reduction of concrete strength due to the permeability of concrete, resistance to salt penetration, degree of de-alkalization, resistance to freezing and thawing, etc., and important evaluation data when selecting repair materials for aged concrete. Is utilized.

Therefore, in order to prevent the composite durability degradation of the existing concrete structure, it is necessary to select a repair material that can fully exhibit the durability and contribute to the integration and durability improvement with the existing concrete.

In the present invention, to evaluate the durability of the permeable polymer mortar to be used for reinforcing stainless steel wire mesh, permeability test of permeable polymer mortar, salt penetration test, neutralization promotion test, freeze thaw resistance test and chemical resistance test were performed. Under the conditions, the results were compared with those of ordinary cement mortar and analyzed.

Permeability test of permeable polymer mortar

Using the permeable polymer composition for reinforcing concrete structures of the present invention to make the permeable polymer mortar at the mixing ratio described above to make the waterproof performance of the permeability test specimen of diameter 10cm, height 4cm and made a standard curing in water, Permeability test was performed. The permeability test was performed by the out-put mathod, and the permeation flux due to the pressure water applied to the test piece was derived by Darcy's law, and the coefficient of permeability was calculated by Equation 1.

K = ρ ・ h / P ㆍ Q / A ------------------- Equation 1

In Equation 1, K is permeability coefficient (cm / s), P is water pressure (kg / cm 2), Q is flow rate (mℓ / s), A is cross-sectional area of test piece (cm 2), and h is test piece Is the height (cm), and p is the density of water (kg / cm 3).

Salt penetration resistance test of permeable polymer mortar

Using a permeable polymer composition for reinforcing concrete structures of the present invention to make a permeable polymer mortar at the mixing ratio described above to cure the specimen in a cylindrical mold of ψ10 X 20 cm in water at 20 ± ℃ After that, accelerated salt penetration diffusion experiments were carried out in accordance with the ASTM 1202 test standard on the specimens cut by the concrete cutter according to the age.

A rubber sealant was used to prevent leakage of the electrolyte solution during the experiment. In this circuit, the power supply 1 should be able to stably supply a 60V direct current of about 0.1, and the measurement of the current can be obtained by measuring the voltage by connecting the resistor R to the circuit. In this case, in order to reduce the influence of the voltage applied to the concrete specimens, a small resistor (R) is used as much as possible. In this experiment, 1.0Ω was used.

The NaCl solution of 3.0 was used as the electrolyte solution in the sodium chloride container 4 of the positive electrode of the diffusion cell 10, and the 0.3OH NaOH solution was used as the solution entering the sodium hydroxide container 3 of the positive electrode. Every 30 minutes during the test, the voltage across the resistor (R) is measured for 6 hours and recorded in the data Roger (2). At this time, the voltage should be able to be measured up to 0.1 mV. Convert to

I = V / R = V / 1.0 ----------------- Equation 2

In Equation 2, I is a current A, V is a voltage V, and R is a resistance Ω.

The measurement measured the voltage across the resistor R for 6 hours at 30-minute intervals, converted it to current, and then calculated the total amount of charge passing through the circuit by the following equation (3).

Q = 900 × (I ₀ + 2I ₃₀ + 2I ₃₀ + 2I ₆₀ + ---- 2I ₃₃₀ + 2I ₃₆ ) -------- Equation 3

In Equation 3, Q is the amount of charge (Coulombs) passing through the circuit, and In is the current (A) when n minutes have elapsed since the start of the experiment.

Table 2 shows the correlation between the permeability of chlorine ions with respect to the total passage charge calculated by Equation 3 above.

Table 2

Passing charges (Coulombs) Chlorine Ion Permeability More than 4000 height 2000 to 4000 usually 1000 to 2000 lowness 100 to 1000 Very low 100 or less Negligible

Neutralization Promotion Experiment

Immediately after the concrete is poured, it has a strong alkalinity of Ph 12 ~ Ph 13 due to calcium hydroxide, a hydroxide product of cement, which prevents corrosion of the reinforcing steel by forming a protective film on the internal steel reinforcement, but the surface of calcium hydroxide reacts with carbon dioxide. It forms calcium carbonate and gradually loses alkalinity from the surface. If this is expressed as chemical reaction equation, it is same as Equation 4.

Ca (OH) ₂ + CO ₂ → CaCO ₃ + H ₂ O ------- Equation 4

Using the permeable polymer composition for reinforcing concrete structures of the present invention, a 5 × 5 × 5 cm cubic test piece was prepared using the permeable polymer mortar and the standard mortar according to a predetermined formulation to determine the degree of neutralization of the permeable polymer mortar at the mixing ratio described above. After 7 days of air-raising, it was exposed to the accelerated tester to increase the concentration of carbon dioxide. Acceleration conditions were set at 40 ° C, relative humidity of 50, and CO ₂ concentration of 10. Determination of the neutralization depth was carried out by cutting the cross section of the test piece at 28 and 60 days from the start of acceleration, and spraying 1-phenolphthalein solution on the cut-out surface according to KS M0015. The neutralization depth was measured for the uncolored portion.

Resistance test for chemical solution

Using the permeable polymer composition for reinforcing concrete structures of the present invention, an experiment was conducted to determine the degree of resistance to the chemical solution of the permeable polymer mortar at the mixing ratio described above. Test specimens of 5 × 5 × 5 cm cubes were prepared using permeable polymer mortar and standard mortar, and after 24 hours, demolded test specimens were used. The chemicals used in the experiment were Na₂SO₄ with solution concentrations of 5H₂SO ₄ and 10. And CaCl2.

Two kinds of test specimens were immersed in three kinds of test solutions, and the compressive strength was measured at 28 days by KS L5105. On the other hand, in order to determine the weight change of the mortar was cured in water for 7 days, the weight was measured, and then immersed in the test solution to measure the weight after immersion by age.

Permeable Polymer Maltar Permeability

Using the permeable polymer composition for reinforcing concrete structures of the present invention, the permeability coefficient (cm / sec) of the permeable polymer mortar was measured at the blending ratio described above, and the permeability coefficient was measured at 7 and 28 days of age. In summary, it is shown in Table 3.

Table 3

Sample Number Permeability coefficient Remarks 7 days of age 28 days of age Standard maltar 2.64 X 10 ^-6 4.23 X 10 ^-8 Permeable Polymer Maltar 1.01 X 10 ^-8 1.54 X 10 ^-9

Looking at Table 3, the standard mortar using cement usually had a permeability coefficient of about 2.64 × 10 ⁻⁶ cm / sec for 7 days of age, and about 4.23 × 10 ⁻⁸ cm / sec for 28 days of age. On the other hand, the permeability coefficient of the permeable polymer mortar blended with the above-described blending ratio using the permeable polymer composition for reinforcing concrete structures of the present invention is 2.64 X 10 ^-8 cm / sec for 7 days, and permeability for 28 days. The coefficient was about 1.54 X 10 ^-9 cm / sec, indicating that the permeation resistance of the permeable polymer mortar blended at the above-mentioned mixing ratio using the permeable polymer composition for reinforcing concrete structures of the present invention was better than that of the cement mortar. .

Salt penetration resistance of permeable polymer mortar

Experiments were conducted to evaluate the resistance to salt permeation diffusion of the permeable polymer mortar blended at the above-described mixing ratio using the permeable polymer composition for reinforcing concrete structures of the present invention. First, a diffuser cell was formed from a conical test piece made of a repaired standard mortar made of 5 cm thick at 28 days of age, and then, every 30 minutes by energizing a 60 V current power supply for 6 hours in the circuit shown in FIG. A current was integrated over time to determine the amount of passing charge. As a result, the passing charge of the standard mortar was 4,100 coulombs, and the passing charge of the permeable polymer was 340 coulombs.

From these results, the standard cement mortar showed a high chlorine permeability of 4,000 Coulombs or more, while the permeable polymer mortar blended at the above-mentioned mixing ratio using the permeable polymer composition for reinforcing concrete structures of the present invention was 100. It was found that the chlorine ion permeability was very low as between 1000 and 1000 Coulombs. Therefore, it was found that the permeable polymer mortar has a high resistance to penetration of salts.

Resistance to neutralization of permeable polymer mortar

In order to evaluate the resistance to neutralization when the penetrating polymer composition for reinforcing concrete structures using the penetrating polymer mortar blended at the above-described mixing ratio and the standard mortar using ordinary cement was used, the neutralization depth was increased up to 60 days of promotion. Measured. As a result, the neutralization depth of standard mortar with age of 28 days was 9 mm, and the neutralization depth of standard mortar with age of 60 days was 18 mm. In contrast, the neutralizing depth of the permeable polymer mortar with age of 28 days was 3 mm, and the neutralizing depth of the permeable polymer mortar with age 60 days was 7 mm.

Chemical Resistance of Penetrated Polymer Maltars

In order to find out the resistance of the chemicals of the infiltrating polymer mortar blended with the above-mentioned compounding ratio using the permeable polymer composition for reinforcing concrete structures of the present invention, three kinds of chemicals, namely sulfuric acid solution, chloride solution and sulfate solution The compressive strength was measured at 28 days of age by dipping and the results are shown in Table 4.

Table 4

Type of medicine 5H ₂ SO ₄ 10Na ₂ SO ₄ 10CaCl ₂ Standard maltar 63 97 96 Permeable Polymer Maltar 86 102 99

When immersed in 5 sulfuric acid solution, standard mortar using cement showed compressive strength of about 63 compared to the compressive strength of test specimen before immersion at 28 days of immersion age. In the case of the permeable polymer mortar blended using the reinforcing permeable polymer composition at the above-described blending ratio, the compressive strength of the compressive strength of the specimen before the immersion was about 86, which was reduced by about 14 degrees.

In addition, in the case of 10Na₂SO₄ and 10CaCl₂ solution, the decrease in compressive strength shows slight difference, so that the permeable polymer mortar blended with the above-mentioned compounding ratio using the permeable polymer composition for reinforcing concrete structure of the present invention is resistant to chemicals. It was judged to be stable even in this harmful environment.

As described above, according to the permeable polymer composition for reinforcing concrete structures of the present invention, a general portland cement of 71.3 to 88.2 weight, calcium to sulfo-aluminate cement of 7.9 to 10.9 weight, and 1.0 to 4.0 weight Silica fume, 1.0 to 4.0 weight fly ash, 0.5 to 2.0 weight anhydrous gypsum, 1 to 4.0 weight expansion material, 0.2 to 1.4 weight reducing agent, 0.1 to 1.1 weight thickener, As it contains 0.1 to 1.3 weight permeable rust inhibitor, repairing the concrete structure using stainless steel wire mesh makes it easy to adhere to the concrete structure and to protect the concrete structure that is easily penetrated and neutralized. At the same time, there is a very good effect of being able to integrate with concrete structures.

Claims (2)

71.3 to 88.2 weight ordinary Portland cement, 7.9 to 10.9 weight calcium-sulfo-aluminate cement, 1.0 to 4.0 weight silica fume, 1.0 to 4.0 weight fly ash, 0.5 to 2.0 weight A weightless dry gypsum, 1 to 4.0 weight expansion material, 0.2 to 1.4 weight reducing agent, 0.1 to 1.1 weight thickener, 0.1 to 1.3 weight permeability rust preventive agent, characterized in that evenly mixed Method for producing a permeable polymer composition for reinforcing concrete structures. Penetrating polymer composition for reinforcing concrete structures prepared by the method of claim 1.