KR100982469B1 - Very-early strength mortar composition for constructing speedy and construction method thereof - Google Patents

Abstract

PURPOSE: A mortar composition for an emergency construction, and a constructing method using thereof are provided to secure the excellent corrosion resistance and durability by mixing an inorganic binder, an organic polymer modifier, an alkoxy silane antirusting agent, and an antibacterial ceramics. CONSTITUTION: A mortar composition for an emergency construction contains the following: 20~60wt% of rapid hardening inorganic binder powder including 30~35wt% of Al_2O_3, 40~42wt% of CaO, and 2~3wt% of MgO; 2~40wt% of organic polymer solid powder selected from the group consisting of an acryl based polymer, a vinyl acetate system polymer, a butyl acrylate/styrene copolymer, a polycarboxylate ether polymer, an ethylenically polymer, and styrene butadiene rubber adhesive polymer; 0.1~8wt% of alkoxysilane system anti-corrosive material powder; 0.3~3wt% of antibiotic ceramics powder; and 30~68wt% of aggregate.

Description

Mortar composition for urgent construction with super fast-tight steel, anti-rust, anti-bacterial and anti-bacterial performance and construction method of concrete structure

The present invention relates to a composition that can be used in emergency construction, such as various concrete pavement and repair construction, and an inorganic polymer having a superhard mirror, a rough steel, and an organic polymer modifier to complement the characteristics such as adhesion and abrasion resistance, anti-neutralization, The present invention relates to a mortar composition comprising a combination of an alkoxy silane-based anti-rusting agent having an anti-corrosive function of reinforcing steel and a metal oxide-based antibacterial ceramics having an antibacterial effect.

Reinforced concrete structure is a structural method that comprehends the inherent characteristics of each material by combining concrete with high compressive strength and reinforcement with high tensile force.Alkaline concrete suppresses corrosion progress by forming a passivation film on the reinforcement. It is an excellent structure that can be taken for more than a year. However, due to the recent industrialization and industrialization, air pollution is intensified and environmental change is worsened, causing deterioration of concrete such as salt and neutralization, and the corrosion of rebar proceeds rapidly, and as a result, the durability life of reinforced concrete structures is decreasing.

The deterioration of durability of reinforced concrete structures due to the deterioration of concrete is maintained through maintenance work. In general, repair work on reinforced concrete structures is performed by removing concrete from flaw-producing areas such as peeling and cracking, and then applying repair mortar. It is desirable that the repair work be urgently performed quickly, so that the repair mortar has the required performance of fastness and roughness, and since it becomes a part of the structure after repair, durability is also a major required performance.

Conventional repair mortars have been proposed for repairing urgent structures or for emergency repairs requiring limited traffic control. In most cases, fasteners are mixed in consideration of fastness, or organic polymers are mixed to form a passivation film for rebar. It was. However, the product mixed with the fastener has a problem that it is difficult to express long-term strength due to the mortar's temporary condensation due to the fastener and the shrinkage expansion coefficient is not sufficient to secure durability after construction.The product mixed with the organic polymer has a problem with the durability of the coating film. There was.

On the other hand, in the case of poor sewage pipes, waste water pipes, etc., the corrosion of the concrete is faster, the durability degradation after repair is further a problem, the conventional repair mortar is vulnerable to bacteria, mold, etc. contained in the waste water.

The present invention was developed to solve the technical problems of the above-described conventional repair mortar, mortar composition having both superhard, roughness, anti-rusting, antibacterial, durability and such mortar for emergency construction, such as repair work, road construction It is desirable to provide a construction method of the concrete structure used.

In order to solve the above technical problem, the present invention provides a mortar composition for emergency construction having anti-rust and antibacterial performance.

Mortar composition for emergency construction having antirust and antibacterial performance according to the present invention is a dry mortar, Al ₂ O ₃ 20 to 60% by weight of a superhard inorganic binder powder containing 30 to 35% by weight, 40 to 42% by weight of CaO and 2 to 3% by weight of MgO; 2 to 40% by weight of an organic polymer solid powder selected from one or more of an acrylic polymer, a vinyl acetate polymer, a butyl acrylate / styrene copolymer, a polycarboxylate ether polymer, an ethylene polymer and a styrene butadiene rubber polymer; 0.1-8% by weight of alkoxy silane-based rust inhibitor powder; 0.3 to 3 wt% of an antibacterial ceramic powder selected from one or more of zinc oxide, magnesium oxide and copper oxide; Aggregate 30 to 68% by weight; characterized in that consisting of.

Still further, the mortar composition for emergency construction having antirust and antibacterial performance according to the present invention is preferably used for the construction of concrete structures such as maintenance and road paving while mixing 12 to 60 parts by weight of water in 100 parts by weight of the dry mortar composition described above. It is available.

According to the present invention, the following effects can be expected.

First, inorganic binders having the properties of superhard and ultra-tension steel, organic polymer modifiers that complement the properties of adhesion, abrasion resistance, neutralization, etc., alkoxy silane anti-rust agents for anti-corrosion function of rebar, metal oxide-based antibacterial Since the ceramics are complexed, it is possible to provide a mortar composition that is advantageous in ultrafast mirror, ultra-tension steel, rust preventive property, antibacterial property and durability.

Second, mortar can be premixed using only dry materials, and thus, on-site dry mortar can be conveniently used while mixing blended water (water) according to development conditions.

Mortar composition for emergency construction according to the invention Al ₂ O ₃ in the formulation design of the emergency construction mortar The use of an ultrahard inorganic binder containing 30 to 35% by weight, 40 to 42% by weight of CaO, and 2 to 3% by weight of MgO, together with the use of an organic polymer modifier, an alkoxy silane-based rust preventive material, and an antibacterial ceramics There is, according to this technical feature the present invention can provide a composition for the emergency construction mortar that exhibits shrinkage compensation as well as ultra-fast mirror, ultra-tight steel, rustproof, antibacterial performance at the same time.

Specifically, the present invention is Al ₂ O ₃ 20 to 60% by weight of a superhard inorganic binder powder containing 30 to 35% by weight, 40 to 42% by weight of CaO and 2 to 3% by weight of MgO; 2 to 40% by weight of an organic polymer solid powder selected from one or more of an acrylic polymer, a vinyl acetate polymer, a butyl acrylate / styrene copolymer, a polycarboxylate ether polymer, an ethylene polymer and a styrene butadiene rubber polymer; 0.1-8% by weight of alkoxy silane-based rust inhibitor powder; 0.3 to 3 wt% of an antibacterial ceramic powder selected from one or more of zinc oxide, magnesium oxide and copper oxide; Aggregate 30 to 68% by weight; characterized in that consisting of.

The mortar composition is a state before the blended water (water) is mixed, which is called dry mortar in the present invention. The dry mortar may be formulated and commercialized in a factory in advance, and the dry mortar thus produced may be mixed with a predetermined compounded water in the field. In the present invention, a mixture of dry mortar and blended water is referred to as a water-blended mortar.

In the present invention, Al ₂ O ₃ as a superhard inorganic binder for shrinkage compensation of mortar The thing containing 30 to 35 weight%, 40 to 42 weight% of CaO, and 2-3 weight% of MgO is proposed. The superhard inorganic binder of this composition can be used to quantitatively analyze the components in the known superhard mixed cement, superhard cement, superhard cement, and special steel mixed cement, which are 60 to 67 wt% of CaO and 17 to SiO ₂ . 25 wt%, Al ₂ O ₃ 3 to 8 wt%, Fe ₂ O ₃ 0.5 to 6 wt%, MgO 0.1 to 2 wt%, SO ₃ 1-3 wt%, Na ₂ O + K ₂ O 0.5 to 1.3 wt%, other 0.1 to 2 wt% There is a clear difference when compared to ordinary Portland cement with a composition of.

Al ₂ O ₃ is a component that produces ettringite (3CaO · Al ₂ O ₃ · 3CaSO ₄ · 3H ₂ O) in a paste kneaded with water, and has a volume of about 2 when ettringite is produced. The present invention proposes an inorganic binder containing 30% to 35% by weight of Al ₂ O _3, which is considerably more than ordinary portland cement, in order to take advantage of the expansion characteristics of the etlingite and to introduce fast hardening. . CaO is a component that produces ettringite and Ca (OH) ₂ by hydration reaction. When fastness is expressed by increasing content of Al ₂ O ₃ , Ca (OH) ₂ is rapidly generated, which may cause cracks. The present invention proposes an inorganic binder containing 40 to 42% by weight of CaO, which is considerably less than ordinary portland cement, thereby controlling the rapid generation of Ca (OH) ₂ to control crack generation. On the other hand, MgO 2 ~ 3% by weight is increased than the high capacity of ordinary portland cement, because MgO is crystallized in the free state of the ferricide crystals and then expands as Mg (OH) ₂ reacts with water during the dry shrinkage of mortar. As the content of MgO increases, the role of shrinkage compensation due to expansion can be effectively expected.

It is preferable to use 20-60 weight% of superhard inorganic binders of the said composition characteristic in mortar mix | blending. If it is less than 20% by weight, it is difficult to expect ultra-tough steel and ultra-fast hardness, and the strength and physical properties are deteriorated. If it is more than 60% by weight, it is difficult to expect workability due to too fast curing, and it is difficult to secure durability due to a large amount of cracks during curing.

In the mortar according to the present invention, the organic polymer solid powder is a polymer for cement admixture for compensating properties such as adhesion, abrasion resistance, and neutralization, and forms a polymer film to form a co-matrix phase (composite matrix phase) together with a binder hydrate. . In general, the hydration process of the binder proceeds faster than the polymer film formation process. In the state where the hydration process of the binder proceeds before the polymer film is formed, the workability of the mortar, air continuity, The bleeding and resistance to material separation will be improved. In addition, as the polymer film forming process proceeds, as the binder hydrate and the polymer film are mixed, a co-matrix phase is formed and strongly binds to the aggregate, thereby improving the tensile strength and toughness of the mortar. It is expected that the water resistance, airtightness, chemical resistance, freezing and thawing resistance, durability and heat resistance will be improved.

The organic polymer solid powder having the above action may be selected from at least one of an acrylic polymer, a vinyl acetate polymer, a butyl acrylate / styrene copolymer, a polycarboxylate ether polymer, an ethylene polymer and a styrene butadiene rubber polymer, and more preferably. Preferably, two or more of the above materials are selected. When two or more are selected and mixed, the polymer film is formed into various composite phases to increase the composite effect. The organic polymer solid powder is suitable for 2 to 40% by weight, but less than 2% by weight of co-metric formation is insufficient, so it is difficult to expect the effect of mixing the organic polymer solid powder, and at 40% by weight or more, too much polymer film is formed. There is a problem that the workability is lowered and the strength of the cured body is lowered.

In the mortar according to the present invention, the alkoxy silane-based rust preventive powder is a modified alkoxy silane, which is chemically reacted with calcium, magnesium and sodium ions, which are unreacted free ions generated during the hydration reaction, to form insoluble salts and to protect the rebar. Plays a role. In the case of the conventional nitrite used as a rust inhibitor, as a soluble salt, redissolved according to the water environment infiltrated from the outside, the durability against rust prevented, but in the present invention, because the alkoxy silane-based rust inhibitor forming an insoluble salt salt is used. It will be advantageous in durability. In addition, the alkoxy silane-based rust preventive material is easily miscible with mortar and freely disperses. In the embodiment of the present invention, as the Protectosil of Degusa, a silane compound having a silane content of 60% or more was used. Alkoxy silane rust preventive materials are suitable in the range of about 0.1 to 8% by weight, but less than 0.1% by weight is difficult to expect rust preventive properties. There is a fear of deterioration in physical properties.

In the mortar according to the present invention, the antimicrobial ceramic powder is selected from one or more of metal oxides such as zinc oxide, magnesium oxide, and copper oxide. The antimicrobial ceramic powder is an antimicrobial metal ion M ⁺ (Zn ^{2 +} , Cu ^{2 +} , Mg ^{2 +} ) adsorbed with inorganic ceramic ions (C ,; ceramic carriers) and ionic bond [M ⁺ + C → MC], Since this binding state is easily dissociated, the antimicrobial metal ions adsorb to proteins of the cell membrane and thus exhibit an antimicrobial action that destroys the cell membrane structure. In the embodiment of the present invention, the same weight mixture of zinc oxide, magnesium oxide, and copper oxide is used, but the ZnO content is 90% or more, MgO content above 90%, CuO A metal oxide based antimicrobial ceramics having a content of 90% or more was used. The antibacterial ceramic powder having such a function is suitable to use 0.3 to 3% by weight.

In the mortar according to the invention the aggregate is used as in the general mortar formulation.

The present invention is 0.2 to 3% by weight of the powder-type shrinkage reducing material, in addition to the above-mentioned material in the composition of the dry mortar; 0.1-3% by weight of powder reducing agent; 0.1 to 2% by weight of a powder defoaming agent; 1.0 to 10% by weight of a pozzolanic mixture selected from silica fume, slag fine powder, fly ash, silica powder and metakaolin; 0.1 ~ 2% by weight of powder coagulation regulator; 0.01 to 3% by weight of synthetic fibers selected from at least one selected from polyvinyl alcohol-based, nylon-based, acrylic-based, polyethylene-based, and polypropylene-based fibers; may further appropriately include at least one.

Shrinkage reducing material is to reduce plastic cracks, it is preferable to use 3.3 Bis (hydroxymethyl) Pentane [diethyl triethylene glycol] with a purity of 99% or more. The shrinkage reducing material has a melting point of 125 ° C. and a boiling point of 210 ° C., which contains a hydrophilic hydroxyl group in the molecule. The hydroxyl group exhibits dispersibility in the mortar mixing process and exhibits resistance to shrinkage during mortar curing. It becomes material to say.

The reducing agent is to increase the flowability of mortar by dispersing the binder particles by the surfactant action, and the antifoaming agent is to provide the hardened mortar of the denser structure by reducing the porosity by suppressing the bubbles generated during the mortar curing. . The pozzolanic mixture is intended to be expressed with high strength, and the coagulation modifier is used to control the curing rate (at the same time as a retarder to secure initial workability and as an accelerator to induce rapid rigidity after construction), and synthetic fibers exhibit tensile strength. To reinforce.

The dry mortar composition of the composition as described above may be used after mixing in advance in the factory and mixed with the blended water (water) at the construction site. Water is mixed 12 to 60 parts by weight based on 100 parts by weight of the dry mortar composition. If water is less than 12 parts by weight, sufficient fluidity is not exhibited, and high strength performance is increased, which may cause self-shrinkment and brittleness. If it is more than 60 parts by weight, material separation due to excessive addition of water and dropping and damage due to reduced strength expression, etc. Results in.

Hereinafter, look at the present invention based on the embodiment. However, the examples are only for illustrating the present invention and the scope of the present invention is not limited thereto.

Example 1 Condensation Time Test of Inorganic Binder According to Al ₂ O ₃ Content

The setting time of the inorganic binder according to the Al ₂ O ₃ content was measured. As a result of measuring the setting time while changing the Al ₂ O ₃ content under the same conditions, it is shown as [Table 1].

Setting time of inorganic binder according to Al ₂ O ₃ content Al ₂ O ₃ content (% by weight) 8 16 32 35 40 45 Test Methods Setting time
(Hours: minutes) First 4:15 2:20 0:34 0:28 0:08 0:05 KSL 5102 closing 7:43 3:10 1:30 1:05 0:30 0:20

As shown in [Table 1] it can be seen that the more the Al ₂ O ₃ content, the shorter the setting time. In particular, when the Al ₂ O ₃ content exceeds about 30% by weight and the termination time is within 2 hours, it can be said that it becomes an inorganic binder expressing super-hardness when the Al ₂ O ₃ content exceeds 30% by weight. have.

Example 2 Mortar Performance Investigation

(1) mortar combination

After mixing the dry mortar composition uniformly in the composition ratio as shown in Table 2, 15 parts by weight of water to 100 parts by weight of the dry mortar composition was mixed with a mortar mixer.

Dry mortar composition Material Usage (% by weight) Remarks Carbide Inorganic Binder 40.80 32.0 wt% Al ₂ O ₃ , 41.0 wt% CaO, 2.60 wt% MgO Organic Polymer Modifiers 2.30 2 parts by weight of butyl acrylate / styrene copolymer powder (at least 98.0% solids, pH 6.5-8.5 in 30% aqueous solution, density 0.54 ± 0.1, MFT 10 ° C.) and polycarboxylate ether powder (at least 97% solids, density 0.45) 0.3 part by weight evenly mixed Alkoxy Silane-based Antirust Materials 5.04 Degusa Protectosil with over 60% Silane content Antibacterial Ceramics 0.90 0.3 weight part of zinc oxide type (90% or more of ZnO content), 0.3 weight part of magnesium oxide type (90% or more of MgO content), copper oxide type (CuO) Content of 90% or more) 0.3 parts by weight aggregate 43.0 It consists of 15 wt% of No.5 company, 30 wt% of No.6 company, 20 wt% of No.7 company, 35 wt% of No.8 company Shrinkage reducing material 0.26 3.3 Bis (hydroxymethyl) Pentane [diethyl triethylene glycol] with purity over 99% Water reducing agent 2.0 Polycarboxylic Acid High Performance Water Reducer Antifoam 0.2 Silicone Deformer Pozzolanic Mixture 5.0 2.5 parts by weight of silica fume and 2.5 parts by weight of metakaolin are mixed uniformly Coagulation Control 0.2 Lithium Carbonate Compound Synthetic fiber 0.3 Polyethylene and Acrylic Mixed Fibers (1: 1)

(2) Mortar physical property test

The physical properties of the mortar blended as described above were examined by the KS F-4042: 2007 test method, and the results are shown in the following [Table 3].

Mortar properties Test Items Test result Test Methods Flexural strength (N / ㎡) 3 hours 3.8 KS F-4042: 2007 1 day 8.7 3 days 11.4 7 days 14.2 28 days 15.7 Compressive strength (N / ㎡) 3 hours 11.2 1 day 33.0 3 days 48.7 7 days 59.7 28 days 69.2 Bond strength (N / mm2) Standard condition 2.1 After hot and cold repeat 1.9 Alkali resistance (N / mm2) 62.7 Neutralization Resistance (mm) 1.6 Permeability (g) 5.2 Water absorption coefficient ^{(kg / ㎡ · h 0 .5} ) 0.27 Moisture penetration resistance (m) 1.5 Chloride ion penetration resistance (coulombs) 812 Length change rate (%) -0.11

As shown in Table 3, the mortar composition according to the present invention has been confirmed to have a compressive strength of 11.2N / mm2 and a daily compressive strength of 33.0N / mm2 for three hours. It is expected that it can be preferably used. In addition, it shows excellent performance in flexural strength, adhesion strength, alkali resistance, neutralization resistance, and chloride ion penetration resistance. Especially, the length change rate is -0.3 ~ 0.3% as the length change rate is -0.11%. It can be seen that the stability is greater than that of the general mortar. Therefore, the present invention is expected to be advantageous in durability when applied as an emergency construction mortar.

(3) Mortar antirust test

Corrosion area was measured by measuring the corrosion area of the mortar blended as described above by KSF-2561 annealing method for corrosion resistance of reinforced concrete in reinforced concrete. As a result of the measurement, the anti-corrosion rate was 98%. Thus, the mortar composition according to the present invention exhibits 95% or more of the result of KSF-2561, resulting in a material exhibiting excellent anti-rust performance.

(4) Mortar antibacterial test

The antibacterial performance by KICM-FIR-1002 (SHAKE FLASK method) was tested about the mortar mix | blended as mentioned above. Test strain was used Escherichia Coli ATCC 25922 and Pesudomonas aeruginosa ATCC 15442, the test results are shown in Table 4 below. As shown in Table 4, the mortar composition according to the present invention was confirmed to exhibit excellent antimicrobial performance.

Mortar antimicrobial Test bacteria sample Initial concentration 24 hours later % Reduction Test Methods Pseudomonas aeruginosa
(Test strain: Pseudomonas aeruginosa ATCC 15442) Blank 362 1006 - KICM-FIR-1002
(SHAKE FLASK method) ZnO based raw materials 362 One 99.7 MgO-based raw materials 362 One 99.7 CuO-based raw materials 362 0 100 Invention mortar 362 One 99.7 Escherichia coli
(Test strain: Escherichia Coil ATCC 25922) Blank 390 978 - ZnO based raw materials 390 One 99.7 MgO-based raw materials 390 One 99.7 CuO based raw materials 390 One 99.7 Invention mortar 390 One 99.7

Claims (4)

Al ₂ O ₃ 20 to 60% by weight of a superhard inorganic binder powder containing 30 to 35% by weight, 40 to 42% by weight of CaO and 2 to 3% by weight of MgO;
2 to 40% by weight of an organic polymer solid powder selected from one or more of an acrylic polymer, a vinyl acetate polymer, a butyl acrylate / styrene copolymer, a polycarboxylate ether polymer, an ethylene polymer and a styrene butadiene rubber polymer;
0.1-8% by weight of alkoxy silane-based rust inhibitor powder;
0.3 to 3 wt% of an antibacterial ceramic powder selected from one or more of zinc oxide, magnesium oxide and copper oxide;
30 to 68 weight percent aggregate;
Dry mortar composition for urgent construction having ultra-fast mirror, ultra-light steel, rust-preventing, antibacterial performance, characterized by consisting of. In claim 1,
0.2 ~ 3% by weight of powder type shrinkage reducing material;
0.1-3% by weight of powder reducing agent;
0.1 to 2% by weight of a powder defoaming agent;
1.0 to 10% by weight of a pozzolanic mixture selected from silica fume, slag fine powder, fly ash, silica powder and metakaolin;
0.1 ~ 2% by weight of powder coagulation regulator;
0.01 to 3% by weight of synthetic fibers selected from one or more of polyvinyl alcohol, nylon, acrylic, polyethylene, and polypropylene fibers;
Dry mortar composition for urgent construction having ultra-fast mirror, ultra-light steel, rust-preventing, antibacterial performance, characterized in that it further comprises at least one. To 100 parts by weight of the dry mortar composition according to claim 1,
Water-mixing mortar composition for emergency construction having ultrafast mirror, ultra-light steel, rust-preventing, and antibacterial performance, characterized by mixing 12 to 60 parts by weight of water. Method of constructing a concrete structure, characterized in that after mixing 12 to 60 parts by weight of water with 100 parts by weight of the dry mortar composition according to claim 1 or 2 at the construction site of the concrete structure .