KR101310674B1 - Concrete structures for maintenance fly - ash by weight of the composition, and using the same concrete structures and rehabilitation - Google Patents

Abstract

PURPOSE: A concrete structure repairing insertion composition is provided to offer excellent cohesive property with a precast (PC) product, and excellent intensity and durability by containing a two-liquid type liquid polymer binding material formed of a main material in a specific composition and a curing agent. CONSTITUTION: A concrete structure repairing insertion composition contains a two-liquid type liquid polymer binding material and fine aggregate in a weight ratio of 1:1-2. The liquid polymer binding material contains a main material and a curing agent. The main material is formed of 50-99 wt% of polyurethane resin, 0.1-15 wt% of polystyrene resin, 0.1-15 wt% of polyol resin, 0.1-15 wt% of terephthalate based resin, 0.01-15 wt% of triallyl isocyanurate, 0.01-15 wt% of dibutyltin dilaurate, 0.1-15 wt% of magnesium oxide, 0.1-15 wt% of hollow fine particle, and 0.1-15 wt% of zeolite. The curing agent contains isophorone diisocyanate.

Description

Concrete structures for maintenance fly-ash by weight of the composition, and using the same concrete structures and Rehabilitation

The present invention relates to an injection material composition for repairing a concrete structure and a method for repairing a concrete structure using the same, and more specifically, to repair a damaged part of a concrete structure, a repair part of a joint part, a strength of a repair part or a joint part by using a joint injection material, To improve the durability to increase the service life.

In general, concrete structures are damaged due to constant load, vibration, shock, abrasion, corrosion, etc. from the vehicle, and breakage progresses due to partial detachment. The cost increases exponentially.

Concrete precast (PC) products have the disadvantage of cracking due to dry shrinkage, latans due to bleeding on the surface, which results in weak surface strength and poor durability. In addition, PC products, namely PC culverts, etc. The water tightness of the joint part of the situation is very poor.

As an alternative to solve this problem, a product using polymer dispersion is used, but it has a disadvantage of high material cost. In particular, most of the injection materials used in the joints of PC products use non-shrink mortar, which can compensate for cracks caused by dry shrinkage, but has a disadvantage of poor water tightness.

Therefore, in order to solve the problems of the PC product, the technical aspect is urgently required to develop a joint injection material, and recently, the non-shrink mortar has been developed and used.

On the other hand, in terms of economics and industrial aspects, it is also necessary to reduce the repair cost by improving the strength and durability of the joint injection and repair materials of PC products.

The present invention has been made to solve the above-mentioned problems, and by reducing the construction period, improve the strength and durability, and consequently for the repair of concrete structures that can increase the service life of the PC product and reduce the repair cost An injection material composition and a concrete structure repairing method using the same are provided.

The present invention, the injection material composition for repairing the concrete structure is composed of a two-component liquid polymer binder and fine aggregate composed of a main agent and a hardener, and the liquid polymer binder and fine aggregate were prepared by mixing in a ratio of 1: 0.1 to 2 by weight. The main components of the liquid polymer binder are polyurethane resin 50 to 99% by weight, polystyrene resin 0.1 to 15% by weight, polyol resin 0.1 to 15% by weight, ferephthalate resin 0.1 to 15% by weight, trially isocyanurate (Triallyl isocyanurate) , TAIC) 0.01-15% by weight, dibutyltin dilorate 0.01-1.5% by weight, magnesium oxide 0.1-15% by weight, hollow microparticles 0.1-15% by weight and zeolite 0.1-15% by weight, as a curing agent Isophorone disocyanate.

The liquid polymer binder may further comprise 0.01 to 3% by weight of pigment, and the pigment may be made of one or more materials selected from titanium oxide, red iron oxide, yellow iron oxide, chromium oxide, purple iron oxide, and black iron oxide. .

The liquid polymer binder may further include 0.01 to 5% by weight of a reaction initiator.

In addition, the repair method of the concrete structure according to the present invention comprises the steps of chipping and removing the deteriorated and deteriorated concrete parts, latans and impurities with a crusher, shot blaster, hand water jet, air compressor, etc .; Cleaning the chipped area with a vacuum inhaler; Applying a primer for improving adhesion between the concrete concrete surface and the filler composition for repairing the concrete structure after checking the water content of the cleaned portion;

Placing the formwork on the primer-treated site; Concrete structure repairing method comprising the step of curing by injecting the injection material composition for repairing the concrete structure according to claim 1 to the mounted formwork.

According to the present invention, the adhesion with the PC product is high, the strength and durability is excellent, there is an effect of reducing the maintenance cost. The injection material composition for repairing concrete structures according to the present invention can be used for repairing PC products, joint injection materials, and the like, and it is possible to construct more economically because it can save labor and labor loss and construction time in the field.

Hereinafter, preferred embodiments of the present invention will be described in detail. However, it should be understood that the following embodiments are provided so that those skilled in the art will be able to fully understand the present invention, and that various modifications may be made without departing from the scope of the present invention. It is not.

The injection composition for repairing concrete structures according to a preferred embodiment of the present invention is composed of a two-component liquid polymer binder and a fine aggregate composed of a main agent and a hardener, and the liquid polymer binder and the fine aggregate are mixed in a weight ratio of 1: 0.2 to 2 in concrete. An injection material composition for repairing structures was prepared.

The main agent and the curing agent of the liquid polymer binder is 1: 0.01 to 1 by weight. The main components of the liquid polymer binder are polyurethane resin 50 to 99% by weight, polystyrene resin 0.1 to 15% by weight, polyol resin 0.1 to 15% by weight, ferephthalate resin 0.1 to 15% by weight, trially isocyanurate (Triallyl isocyanurate) , TAIC) 0.01-15% by weight, dibutyltin dilorate 0.01-1.5% by weight, magnesium oxide 0.1-15% by weight, hollow microparticles 0.1-15% by weight and zeolite 0.1-15% by weight, as a curing agent Isophorone disocyanate.

And the content of the pigment may further comprise 0.01 to 3% by weight based on the total weight of the liquid polymer binder.

In addition, the content of the reaction initiator may further include 0.01 to 5% by weight based on the total weight of the liquid polymer binder.

The injection material composition for repairing the concrete structure is characterized in that the liquid polymer binder: fine aggregate 1: 1: 0.1 to 2 by weight ratio. The fine aggregate is used by mixing the silica sand No. 4 to No. 8 in a weight ratio of 1: 0.1 ~ 0.6: 0.1 ~ 0.6.

The polyurethane resin uses a hard segment using glycol and amines, a soft segment using polymeric glycol, and a polyisocyanate as main raw materials. Polyurethane synthesis is synthesized by one-shot method of reacting a mixture of polyurethane glycol and chain extender and polyisocyanate at once, and prepolymer method of chain extension of the prepolymer again after excessive reaction of polyisocyanate. The polyurethane resin has excellent tensile strength, excellent chemical resistance and abrasion resistance, and is commonly used in almost all fields of polymer materials such as Elastomer, Flexible Foam, Rigistic Foam, Plastic, Paint, Adhesive, Fiber Synthetic Leather. The polyurethane resin is preferably contained 50 to 99% by weight relative to the total weight of the injection material composition for repairing concrete structures, when the polyurethane resin content exceeds 99% by weight ductility is strong, it is easy to occur deformation by load, If it is less than 50 weight%, brittleness becomes strong and impact strength falls.

The polystyrene resin has excellent impact resistance, rigidity, fluidity, and the like, and also has excellent characteristics such as dimensional stability, molding processability, chemical resistance, convenience, workability, and price competitiveness. Instead of polystyrene resins, vinyl chloride resins, ABS (acrylonitrile, butadiene, styrene) resins, acrylic resins, and the like can be used. The content of the polystyrene resin is preferably included 0.1 to 15% by weight based on the total weight of the injection material composition for repairing concrete structures, when the content exceeds 30% by weight workability, formability, chemical resistance, toughness and elongation Increased but not economical, if less than 0.1% by weight, workability is poor, moldability is lowered, toughness and elongation is also lowered.

The polyol resin serves to form a polymer having a ductility, and is a raw material for making a polymer compound having a urethane bond (-OCONH-) in the molecule, sorbitol, glycerol, polyethylene glycol, polypropylene glycol, propylene glycol, di Propylene glycol, 1,3-butylene glycol, hexylene glycol, 1,4-butanediol, 1,2,6-hexatriol and the like. Polyol resin is a rubber-like elastomer, which is widely used when making urethane rubber, synthetic fibers, adhesives, paints, urethane foams, and automobile bumpers. As rubber, aliphatic polyester of polyetherdiol and terminal diol, such as polyethyleneglycol and polypropylene glycol, is used as a diol. For the use of urethane foam, triisocyanate is often added to make it thermosetting. Recently, a high-speed, energy-molding method called Reaction Injection Molding (RIM) has been developed and its use is expanding. The content of the polyol resin is preferably included 0.1 to 15% by weight relative to the total weight of the injection material composition for repairing concrete structures. If the content of the polyol resin is more than 15% by weight, the ductility and elasticity is improved, but the material separation phenomenon is likely to occur, and less than 0.1% by weight, the ductility and elasticity is reduced.

The triallyl isocyanurate is a substance added to lower the melt viscosity of the resin to facilitate processing. Phthalic acid ester, trimellitic acid ester, phosphate ester, polyester, fatty acid ester, chlorinated paraffin, 4,4 '-(1,3-phenylene diisopropylidene) in place of the triallyl isocyanurate ) Bisaniline and the like can be used. The content of the triallyl isocyanurate is preferably 30 to 50% by weight based on the total weight of the filler composition for repairing concrete structures, and if the content of the plasticizer exceeds 50% by weight, it is flexible and has good cold resistance and processability. In addition, the material separation phenomenon is likely to occur, and less than 30% by weight, the material separation phenomenon is reduced, but the mechanical strength is lowered.

The dibutyltin dilaurate is used as a curing accelerator of a polyurethane resin or an MMA resin as an organometallic compound. Dibutyltin dilorate is a complex metal compound-based compound used as a polyurethane reaction and hardening accelerator. It is superior in safety to human body compared to other metals, and has excellent catalytic ability and thermal stability. To increase the reaction rate. In addition, monobutyltin (MBT), Dibutyltin (DBT), Tributyltin (TBT), Tetrabutyltin (TeBT), Monooctyltin (MOO), Dioctyltin ( No harmful substances such as Dioctyltin (DOT), Tricyclohexyltin (TchT), Triphenyltin (TPT), etc. are detected.

The content of the dibutyl tin dilorate is preferably in the range of 0.01 to 1.5% by weight. If the content of dibutyltin dilorate is less than 0.01% by weight, the reaction rate is lowered and the curing time is slow. If the content is more than 1.5% by weight, the curing time is faster and the workability is lowered.

The isophorone disocyanate curing agent is a cycloaliphatic diisocyanate monomer which is useful in the manufacture of chemicals, reactive intermediates and polymers. It is used to make useful intermediate products by reacting mixtures with active hydrogen at room temperature. There is a characteristic. PU polymer products made using IPDI exhibit high flexibility with excellent mechanical strength. In addition, while maintaining excellent wear resistance, water resistance and gloss and physical properties over time, there is a property that can produce an optically transparent PU when used with a suitable polyol. The structural formula is C ₁₂ H ₁₈ N ₂ O ₂ . The content of the isophorone disocyanate curing agent is preferably in the range of 0.01 to 1.5% by weight. When the content of the isophorone disocyanate curing agent is less than 0.01% by weight, the reaction rate is lowered and the curing time is slowed. When the content is more than 1.5% by weight, the curing time is faster and the workability is lowered.

Magnesium oxide (MgO) is used as an inorganic flame retardant material. The magnesium oxide has a chemical formula of MgO, and has a chemical formula of 40.3, also referred to as Goto, an industrial product is called magnesia, and a medicine is called magnesia. The melting point of magnesium oxide is 2826 ° C., boiling point is 3600 ° C., specific gravity is 3.65, solubility is 0.62 mg / 100 g and the refractive index is 1.7364. Magnesium oxide is obtained by heating metal magnesium in air. Industrially, magnesium oxide is produced by calcining magnesium carbonate (magnesite), magnesium hydroxide, magnesium hydroxide and the like. Magnesium oxide is a white crystalline solid and is chemically relatively inert. Magnesium oxide is slightly soluble in water but soluble in dilute acids. Magnesium oxide absorbs water and carbon dioxide from the air and slowly becomes magnesium hydroxide. Magnesium oxide has a very high reflectivity against visible and near ultraviolet rays and is used as a reflector or white standard in optical machinery. Magnesium oxide is also industrially used as a raw material for magnesia cement, steelmaking furnace materials, and refractory lead.

Magnesium oxide is preferably included 0.1 to 15% by weight relative to the total weight of the injection material composition for repairing concrete structures, if the content of magnesium oxide exceeds 15% by weight of the flame retardancy is improved, but workability and strength is reduced, 0.1% by weight If less than, workability and strength increase, but the flame retardant effect is lowered.

The hollow microparticles are used to prepare an injection material composition for repairing a concrete structure to absorb shocks. The hollow fine particles may be regarded as a generic term for by-products generated by floating in exhaust gas when a silicon alloy such as silicon or ferrosilicon is manufactured in an electric arc furnace. The hollow fine particles used in the preferred embodiment of the present invention are 90% or more spherical and have an average particle size of 0.1 탆. Hollow particles are effective for enhancing strength, increasing freeze-thawing resistance, increasing chemical resistance to sulfuric acid, hydrochloric acid and organic acids, reducing heat of hydration, improving hydrothermal and durability, and producing high strength and high durability concrete. The hollow fine particles not only improve the durability of the joint member but also improve the load resistance, and therefore, the hollow member can be manufactured to be able to withstand load shock sufficiently.

The hollow microparticles are preferably included in an amount of 0.1 to 15% by weight based on the total weight of the injection material composition for repairing the concrete structure. If less than 0.1% by weight, the external impact strength is lowered.

The zeolite (zeolite) is used as a moisture absorbent to prevent foaming by absorbing moisture of the polyol resin during fast curing. The zeolite is a general term for minerals that are aluminum silicate hydrates of alkali and alkaline earth metals, and the color is colorless transparent or white translucent. Zeolites, also called zeolites, have many types, but have a high water content, a property of crystals, and an acid phase. Zeolite firmness does not exceed 6 and specific gravity is about 2.2. Zeolites are usually dissolved in hydrochloric acid and often get glued, but few are insoluble in hydrochloric acid. The main types of zeolites include the stone, fisheye, cabbage, soda-stone, hallandite, steel bite, lomontite, and enesite. These zeolites are produced in the cavities and thermodes of basic igneous rocks such as basalt and tuff, and sometimes exist as secondary minerals in granite and gneiss. In addition, a zeolite may be calculated in gold veins and other veins. The zeolite has a loose crystal structure, and even if it releases the water filled therein at high heat, the skeleton remains the same, so that other fine particles can be adsorbed. Using this property, zeolite is used as an adsorbent and is sometimes used as a molecular sieve to separate particulates of different sizes.

The zeolite is preferably included 0.1 to 15% by weight relative to the total weight of the injection material composition for repairing the concrete structure, the workability is lowered if the content of the zeolite exceeds 15% by weight, material separation occurs if less than 0.1% by weight Can be.

The pigment is for imparting aesthetic or identification function of the safety scaffold, and various pigments may be used, and inorganic pigments are particularly preferable. The inorganic pigment may include titanium oxide (white), red iron oxide, yellow iron oxide, chromium oxide (Cr ₂ O ₃ ), purple iron oxide, black iron oxide (carbon black) and the like, and the content of the pigment is the total weight of the liquid polymer binder. It is preferable that it is 0.01 to 3 weight% with respect to.

The reaction initiator plays a role of initiating a reaction, and the reaction initiator is preferably a peroxide that generates a radical by easily breaking a single bond by pyrolysis. The peroxides include benzoyl peroxide, acetyl peroxide, dilauryl peroxide, di-tert-butyl peroxide, cumyl hydroperoxide, hydrogen peroxide, potassium persulfate, and the like. The content of the reaction initiator is preferably included 0.01 to 5% by weight relative to the total weight of the liquid polymer binder, and if the content of the reaction initiator exceeds 5% by weight, the reactivity is increased to increase the viscosity of the composition to reduce workability, 0.01 If the amount is less than the weight%, the reactivity of the composition is lowered, so that a material separation phenomenon occurs and the strength is also lowered.

The fine aggregate is preferably used by mixing the particle size of silica sand No. 4 to No. 8 in a weight ratio of 1: 0.1 to 0.6: 0.1 to 0.6 ratio. If the particle size of the fine aggregate is larger than this, the flowability of the injection material may be improved, but there is a fear of material separation, and if it is smaller than this, the workability may be reduced.

Hereinafter, a concrete structure repairing method using an injection material composition for repairing a concrete structure according to a preferred embodiment of the present invention will be described.

In addition, the repair method of the concrete structure according to the present invention comprises the steps of chipping and removing the deteriorated and deteriorated concrete parts, latans and impurities with a crusher, shot blaster, hand water jet, air compressor, etc .; Cleaning the chipped area with a vacuum inhaler; Applying a primer for improving adhesion between the concrete concrete surface and the filler composition for repairing the concrete structure after checking the water content of the cleaned portion; Placing the formwork on the primer-treated site; It provides a concrete structure repair method comprising the step of curing by injecting the injection material composition for repairing the concrete structure according to claim 1 in the mounted formwork.

The primer may use at least one material selected from styrene butadiene rubber latex, polyacrylic ester, acrylic, ethyl vinyl acetate, methyl methacrylate, and silane compound, but is not limited thereto.

Embodiments of the above-described concrete structure repairing filler composition and expansion joint composition according to the present invention are described in more detail, and the present invention is not limited by the following examples.

<Examples 1-3 and Comparative Examples 1-6>

Magnesium oxide, hollow particulates, zeolites, pigments and fine aggregates according to the contents shown in Table 1 below, and after mixing the main and the curing agent, mixed dry magnesium oxide, hollow particulates, zeolites, pigments and fine aggregates While stirring, an injection material composition was prepared.

At this time, the ratio of the main agent and the curing agent is 1: 0.05, the ratio of the liquid polymer binder and fine aggregate was prepared by mixing 1: 0.3.

The components and contents (% by weight) of the injection material compositions of Examples 1 to 3 and Comparative Examples 1 to 6 are shown in Table 1 above.

[Table 1]

The following test examples show the experimental results comparing the characteristics of the examples according to the present invention and the characteristics of Comparative Examples 1 to 6 so that the characteristics of Examples 1 to 3 according to the present invention can be more easily understood. .

In order to measure the physical properties of the injection material composition was carried out as follows.

The slump-flow test was performed by the slump-flow test (degree of dough) according to the method specified in KS F 2402. The slump-flow test tests the dough of the composition such as the flue and viscosity of the composition. The larger the value, the better the workability, that is, the workability at the time of casting the composition.

Tensile strength and elongation rate of the injection molding composition prepared in Examples 1 to 3 and Comparative Examples 1 to 6 to the dumbbell-shaped mold according to ASTM D 638 and cured for 7 days after constant curing (20 ± 2 ℃, relative It was measured by curing at 65 ± 5% (RH).

The compressive strength was measured by injecting the composition into a mold of 1 × 1 × 3cm according to ASTM C 579 and compressing the specimen.

Adhesion strength was measured according to ASTM C 882.

Absorption was measured by ASTM C 881.

Abrasion resistance was measured by ASTM C 501.

Pot life was measured by AASHTO M-200-73.

The accelerated weathering test was measured over 5000 hours by ASTM C 793.

Table 2 below shows the measurement results for Examples 1-3 and Comparative Examples 1-6.

[Table 3]

As shown in Table 2, the composition according to the present invention was superior in workability, tensile strength, elongation rate, compressive strength, adhesive strength, water absorption, wear resistance than the composition of Comparative Examples 1-6. In Comparative Examples 10 to 12, surface peeling occurred after measuring the accelerated weathering test.

As mentioned above, although preferred embodiment of this invention was described in detail, this invention is not limited to the said embodiment, A various deformation | transformation by a person of ordinary skill in the art within the scope of the technical idea of this invention is carried out. This is possible.

Claims (4)

It is made by mixing in a ratio of 1 to 2 by weight of the two-component liquid polymer binder composed of the main body and the curing agent and 1 to 2 ratio of the fine aggregate,
The main components of the liquid polymer binder are polyurethane resin 50 to 99% by weight, polystyrene resin 0.1 to 15% by weight, polyol resin 0.1 to 15% by weight, ferephthalate resin 0.1 to 15% by weight, trially isocyanurate (Triallyl isocyanurate) , TAIC) 0.01-15% by weight, dibutyltin dilorate 0.01-1.5% by weight, magnesium oxide 0.1-15% by weight, hollow microparticles 0.1-15% by weight and zeolite 0.1-15% by weight, as a curing agent An injection material composition for repairing concrete structures, comprising isophorone disocyanate.
The method of claim 1,
The liquid polymer binder may further comprise 0.01 to 3% by weight of the pigment, the pigment is characterized in that consisting of at least one material selected from titanium oxide, red iron oxide, yellow iron oxide, chromium oxide, purple iron oxide and black iron oxide. Injection material composition for repairing concrete structures.
The method of claim 1,
The liquid polymer binder, concrete structure repair injection material composition, characterized in that it further comprises 0.01 to 5% by weight of the reaction initiator.
A chipping step of chipping and removing corroded and deteriorated concrete parts, latans and impurities with a crusher, shot blaster, hand water jet, and air compressor;
Cleaning the chipped portion with a vacuum inhaler;
An application step of applying a primer for improving adhesion between the concrete concrete surface and the filler material composition for repairing the concrete structure after checking the water content of the cleaned portion;
A formwork step of placing the formwork on the primer-treated site;
Concrete structure repairing method comprising the step of curing by injecting the injection material composition for repairing the concrete structure according to claim 1 to the mounted formwork.