KR101993748B1 - Concrete Composition for Steel-Concrete Connection of Bridge and Constructing Methods Using Thereof - Google Patents

Abstract

The present invention relates to a concrete composition for an S/C joint of a bridge and a construction method using the same. The concrete composition comprises: 50 to 1,000 parts by weight of aggregate; 1 to 30 parts by weight of blast furnace slag fine powder; 1 to 20 parts by weight of fly ash; 0.5 to 10 parts by weight of a fluidizing agent; 5 to 20 parts by weight of a shrinkage reducing agent; 5 to 15 parts by weight of a slump reducing agent; 10 to 30 parts by weight of nano-ceramic particles; 5 to 20 parts by weight of silica fume; 2 to 20 parts by weight of fibers; 0.1 to 5 parts by weight of antioxidant; 3 to 20 parts by weight of an adhesion promoter; 0.5 to 10 parts by weight of a stabilizer; 5 to 30 parts by weight of a strain inhibitor; and 0.01 to 10 parts by weight of a high performance water reducing agent, based on 100 parts by weight of cement. According to the present invention, the concrete composition for an S/C joint of a bridge can secure filling properties within the S/C junction cell and slope formability, and control the flow rate for the slump change of the concrete composition.

Description

Concrete Composition for Steel-Concrete Connection of Bridge and Constructing Methods Using Thereof}

The present invention relates to a concrete composition for the S / C joint of the bridge and a construction method using the same, more specifically, the concrete for the S / C joint of the bridge applicable to the steel-concrete connection in the bridge concrete construction It relates to a composition and a construction method using the same.

Existing steel box girder cross-section bridges are widely used both at home and abroad because their construction is relatively faster than other methods.

In addition, the steel box girder steel box girder bridge is a bridge type having a great advantage in a curved bridge because of the large torsional rigidity, but has a disadvantage in that it is large in cross section.

As with all continuous bridges, steel box bridges are inconsistent in selecting the cross-sectional size through the length of the bridge because the maximum static moment and the maximum parent moment are different in structural dynamics.

Here, the steel box girder (Steel Box Girder) is the weight of the steel box girder is usually 320 to 360 ㎏ / ㎡, the amount of steel is required for the manufacture of the girder, reinforced concrete bottom plate is synthesized on the top of the steel box girder Since the steel box girder has a large self-weight, as a whole, the steel box girder has a large self-weight, and thus, when the steel box girder is applied as a superstructure of the bridge to a bridge having a long span (about 60m or more), the construction cost is greatly increased. There is a problem.

Meanwhile, a conventional steel deck girder made of pure steel without using reinforced concrete deck plates, that is, a conventional steel deck girder having a box-shaped cross section, but the bottom board is also made of steel plates, has a light weight and is about 60 m long. Although it can be used to build a bridge between the Jangji to 100m, it is difficult to manufacture and on-site assembly, and the amount of steel required greatly increases (about 450 ~ 500 ㎏ / ㎡), there is a problem that the construction cost is too large.

In the case of the steel box girder and the steel plate girder as described above, since the members forming the box-shaped cross-section is made of steel, not only requires a thorough coating on the inside of the box to prevent corrosion of the steel, but also thoroughly checks the internal coating during use. Should be.

However, the box-shaped interior of the steel box girder is a very narrow space, and it is very inconvenient to carry out such internal painting inspection and other maintenance work in such a narrow space inside the box, and it becomes difficult to perform a perfect maintenance, and thus maintenance. The cost also has a drawback.

As a related art related to the steel box girder, Korean Patent Publication No. 10-2012-0093613 discloses a "prestressed concrete box girder of a steel plate deck integral composite structure and a bridge construction method using the same". have.

The present invention was created to solve the above problems, and is easily filled inside the S / C junction cell of the bridge to ensure the filling, while providing the formability of the slope (slope) section, An object of the present invention is to provide a concrete composition for the S / C joint of the bridge to be able to adjust the flow rate for the slump change of the concrete composition.

The present invention

Based on 100 parts by weight of cement,

Aggregate 50 to 1,000 parts by weight;

Blast furnace slag fine powder 1 to 30 parts by weight;

1 to 20 parts by weight of fly ash;

0.5 to 10 parts by weight of a glidant;

5 to 20 parts by weight of shrinkage reducing agent;

5 to 15 parts by weight of slump reducing agent;

10 to 30 parts by weight of nanoceramic particles;

5 to 20 parts by weight of silica fume;

2 to 20 parts by weight of fibers;

0.1 to 5 parts by weight of antioxidant;

3 to 20 parts by weight of adhesion promoter;

Stabilizer 0.5 to 10 parts by weight;

5 to 30 parts by weight of a strain inhibitor; And

It provides a concrete composition for the S / C joint of the bridge comprising 0.01 to 10 parts by weight of a high performance water reducing agent.

 In addition, the present invention is a hole installation step of installing a concrete placing hole, vibration compaction hole and air vent hole in the construction surface of the bridge to be constructed;

A foreign material removal-cleaning step of removing and cleaning the foreign matter on the construction surface at which the hole installation step is completed;

50 to 1,000 parts by weight of aggregate, 1 to 30 parts by weight of blast furnace slag fine powder, 1 to 20 parts by weight of fly ash, 0.5 to 5 parts by weight of cement based on 100 parts by weight of the concrete pouring hole of the construction surface where the foreign material removal-cleaning step is completed 10 parts by weight, shrinkage reducing agent 5 to 20 parts by weight, slump reducing agent 5 to 15 parts by weight, nano ceramic particles 10 to 30 parts by weight, silica fume 5 to 20 parts by weight, fibers 2 to 20 parts by weight, antioxidant 0.1 to Mixing water and concrete composition for the S / C joint of the bridge comprising 5 parts by weight, 3 to 20 parts by weight of adhesion promoter, 0.5 to 10 parts by weight of stabilizer, 5 to 30 parts by weight of anti-strain agent, and 0.01 to 10 parts by weight of high performance water reducing agent Pouring after pouring;

A vibration compacting step by inserting a vibration compaction device into the vibration compacting hole and vibrating the vibration after the pouring step is finished; And

It provides a construction method of the concrete composition for the S / C joint of the bridge comprising a curing step of curing the concrete composition after the vibration compacting step.

The concrete composition for the S / C joint of the bridge according to the present invention has the effect of ensuring the internal filling and slope formability of the S / C joint cell (s), the flow rate for the slump change of the concrete composition have.

Hereinafter, the present invention will be described in detail.

In one aspect, the present invention, based on 100 parts by weight of cement, 50 to 1,000 parts by weight of aggregate; Blast furnace slag fine powder 1 to 30 parts by weight; 1 to 20 parts by weight of fly ash; 0.5 to 10 parts by weight of a glidant; 5 to 20 parts by weight of shrinkage reducing agent; 5 to 15 parts by weight of slump reducing agent; 10 to 30 parts by weight of nanoceramic particles; 5 to 20 parts by weight of silica fume; 2 to 20 parts by weight of fibers; 0.1 to 5 parts by weight of antioxidant; 3 to 20 parts by weight of adhesion promoter; Stabilizer 0.5 to 10 parts by weight; 5 to 30 parts by weight of a strain inhibitor; And it provides a concrete composition for the S / C joint of the bridge comprising 0.01 to 10 parts by weight of a high performance water reducing agent.

In another aspect, the present invention comprises a hole installation step of drilling the concrete placing hole, vibration compaction hole and air vent hole in the construction surface of the bridge to be constructed; A foreign material removal-cleaning step of removing and cleaning the foreign matter on the construction surface at which the hole installation step is completed; 50 to 1,000 parts by weight of aggregate, 1 to 30 parts by weight of blast furnace slag fine powder, 1 to 20 parts by weight of fly ash, 0.5 to 5 parts by weight of cement based on 100 parts by weight of the concrete pouring hole of the construction surface where the foreign material removal-cleaning step is completed 10 parts by weight, shrinkage reducing agent 5 to 20 parts by weight, slump reducing agent 5 to 15 parts by weight, nano ceramic particles 10 to 30 parts by weight, silica fume 5 to 20 parts by weight, fibers 2 to 20 parts by weight, antioxidant 0.1 to Mixing water and concrete composition for the S / C joint of the bridge comprising 5 parts by weight, 3 to 20 parts by weight of adhesion promoter, 0.5 to 10 parts by weight of stabilizer, 5 to 30 parts by weight of anti-strain agent, and 0.01 to 10 parts by weight of high performance water reducing agent Pouring after pouring; A vibration compacting step by inserting a vibration compaction device into the vibration compacting hole and vibrating the vibration after the pouring step is finished; And it provides a construction method of the concrete composition for the S / C joint of the bridge comprising a curing step of curing the concrete composition after the vibration compacting step is completed.

The cement according to the present invention is not particularly limited as long as it is a cement commonly used in the art, and preferably, special port such as general portland cement or blast furnace slag cement, ultra fine powder cement, cemented carbide etc. may be used.

The preferred powder level of the cement is preferably 3,200 to 6,500 cm ² / g.

The content of the remaining components other than cement constituting the concrete composition according to the present invention, specifically the concrete composition for the S / C joint of the bridge is based on 100 parts by weight of cement.

Aggregate according to the present invention is a mineral material for construction that can be aggregated by a binder such as concrete to form a mass, and is chemically stable.

The aggregate is mixed with cement and water to make concrete.

Preferred aggregates are crushed coarse aggregates, crushed fine aggregates, natural fine aggregates, preferably sand, gravel, basalt, stone stones, basalt, and other similar materials.

Herein, the aggregate may further include basic veins having a particle diameter of about 20 mm and an absorption rate of about 0.7% and / or bauxite having a particle size of about 5 mm and an absorption rate of 5.40%.

In addition, the aggregate is called the aggregate aggregate of less than 0.074mm or less than 4.76mm depending on the size, and more than 4.76mm is referred to as coarse aggregate, the size is preferably not more than 20mm.

The amount of the preferred aggregate is not particularly limited, but is preferably 50 to 1,000 parts by weight based on 100 parts by weight of cement.

The blast furnace slag powder according to the present invention is intended to improve fluidity and to have sufficient compressive strength and flexural strength while eliminating the elution of harmful substances, and may be any conventional blast furnace slag fine powder having such a purpose. Do.

The preferred amount of blast furnace slag fine powder is 1 to 30 parts by weight based on 100 parts by weight of cement, the powder degree is 4,000 to 6,000 cm ² / g, preferably about 5,000 cm ² / g, the density is 2.9 to 3.5 g / cm ³ , preferably about 3.1 g / cm ³ .

The fly ash according to the present invention can be used in an appropriate amount of concrete composition, in particular, concrete composition for the S / C joint of the bridge can improve the processability and the heat of hardening, and improve the long-term strength and water tightness.

Here, the fly ash means a coal material collected by a dust collector from the flue gas of the boiler for burning pulverized coal, the spherical particle size is about the same as cement, and alumina and silica are the main components.

In a particular embodiment, the fly ash according to the present invention may use pulverized fly ash, wherein the pulverized fly ash provides improved high strength and / or fluidity than using a non-pulverized fly ash. .

At this time, the powder degree of the pulverized fly ash according to the present invention is 3,000 to 3,800 cm ² / g, preferably 3,000 to 3,800 cm ² / g, more preferably less than 3,700 cm ² / g, the density is 1.5 to 2.8 g / cm ³ , preferably about 2.2 g / cm ³ .

The preferred amount of fly ash is preferably 1 to 20 parts by weight based on 100 parts by weight of cement.

The fluidizing agent according to the present invention is to improve the mixing and fluidity of the concrete composition for the S / C joint of the bridge, and is not particularly limited as long as it is a fluidizing agent commonly used in the art, preferably lignin-based compound, naphthalene Although it is preferable to use a compound, a melamine compound, and / or a polycarboxylic acid compound, it is preferable to use a polycarboxylic acid.

Although the usage-amount of the said fluidizing agent is not specifically limited, Preferably it is 0.5-10 weight part based on 100 weight part of cement.

The shrinkage reducing agent according to the present invention is added to prevent dry shrinkage of the concrete composition, and any one or more selected from polyether, ethylene glycol, and propylene glycol may be used, but is not limited thereto. The kind used as may be used.

The preferred amount of shrinkage reducing agent is 5 to 20 parts by weight based on 100 parts by weight of cement.

The slump reducer according to the present invention is to rapidly cure concrete to prevent cracking caused by high drying shrinkage and heat of hydration of the concrete composition, and any slump reducer in the art having such a purpose may be used. Although it is preferable, there is preferably an inorganic salt-based slump reducing agent mainly composed of sodium silicate and / or potassium silicate, and reacted with calcium hydroxide with calcined alum to form calcium aluminate hydrate, etringite, etc. There is a slump reducer comprising hard minerals.

Here, the cement-based slump reducing agent is superior in long-term strength than the slump reducing agent including the inorganic salt-based and the hard minerals described above.

However, since the cement-based slump reducing agent shows alkalinity, it is difficult to work in a specific place such as a closed space when using a large amount thereof, and it may be contaminated with the surrounding soil, so it is preferable to consider the selection.

The amount of the preferred slump reducing agent is recommended to be 5 to 15 parts by weight based on 100 parts by weight of cement.

Since the nasoceramic particles according to the present invention rise to the surface during curing to form a dense and high-hard concrete, it prevents the permeation of water vapor, other gases, and liquids, as well as moisture resistance, durability, weather resistance, impact resistance, and weather resistance. It has excellent chemical properties and protects the concrete composition from ultraviolet rays.

Preferred nanoceramic particles include silicon carbide, alumina, silica, zirconia-silica, ZnO, TiO ₂ and / or CaCO ₃ .

It is preferable that these ceramic particles have an average particle diameter in the nano range, specifically, the average particle diameter of the silicon carbide is 300 to 500 nm, the average particle diameter of the alumina is 500 to 1000 nm, the average particle diameter of the silica is 700 to 1500 nm, and the zirconia- The average particle diameter of silica is 500 to 1000 nm, the average particle diameter of ZnO is 500 to 1000 nm, the average particle diameter of TiO ₂ is preferably 100 to 300 nm, and the average particle diameter of CaCO ₃ is preferably 500 to 1000 nm.

Among them, silicon carbide is artificially present because it does not exist as a natural mineral, and has excellent chemical stability and corrosion resistance at high temperature and high hardness.

In addition, due to the excellent thermal stability of silicon carbide and alumina to prevent the rise in temperature to reduce the shrinkage, expansion of concrete and to prevent the neutralization / chloride of the resin to maintain durability for a long time.

The amount of the nanoceramic particles used may be changed by the user's choice, but it is preferably 10 to 30 parts by weight based on 100 parts by weight of cement.

Silica fume according to the present invention is intended to facilitate the hardening of the concrete composition and at the same time as a filler, any silica fume commonly used in the art for this purpose may be used, the amount of the cement is used It is good that 5 to 20 parts by weight based on 100 parts by weight.

Here, the average particle diameter of the silica fume may be 0.01 to 100㎛, preferably 0.01 to 50㎛, more preferably 0.01 to 30㎛.

These particles have a fine size as described above, so that the filling rate is increased, and as a result, not only the early strength is expressed but also the compressive strength of the final concrete cured body is increased. When the average particle diameter is within the above range, it is possible to secure high filling rate and high stability to prevent phase separation while preventing agglomeration due to static electricity.

Fiber according to the present invention is to provide a tensile force and / or light weight due to the stress applied in the longitudinal-lateral direction of the bridge formed of the concrete composition, any fiber may be used for this purpose, but preferably Preferably, asbestos, rock wool, polypropylene, polyester, glass fibers, natural cellulose fibers and mineral fibers, it is preferable to use a mixture of any one or more selected, the amount is preferably 2 to 20 parts by weight based on 100 parts by weight of cement.

The antioxidant according to the invention is for preventing the oxidation of the concrete composition.

Preferred antioxidants may be used amine-based, bisphenol-based, monophenol-based and sulfur-based antioxidants, the amount is preferably 0.1 to 5 parts by weight based on 100 parts by weight of cement.

Specifically, the antioxidant according to the present invention is a low molecular type polymeric phenolic antioxidant such as 2.2-methylenebis (4-methyl-6-t-butylphenol) [2. 2-M ethylenebis (4-methyl-6-t-butylphenol)], 2.6-di-t-butyl-4-methylphenol (2.6-di-t-Butyl-4-methylphenol) or mixtures thereof I recommend you.

The adhesion promoter according to the present invention is to be able to more easily adhere to the construction surface on which the concrete composition is constructed, its amount is preferably used 3 to 20 parts by weight based on 100 parts by weight of cement.

Preferred adhesion promoters may use hydroxy ethyl acryloyl phosphate, hydroxy ethyl methacrylate phosphate or mixtures thereof.

The stabilizer according to the present invention is to provide stability by protecting the concrete composition from ultraviolet rays, and may be used as long as it is a conventional stabilizer in the art having such a purpose, but preferably an acrylic polyol resin, a yellowed polyurea It is preferable to use a resin, a polyisocyanate or a mixture thereof, and the amount thereof is preferably 0.5 to 10 parts by weight based on 100 parts by weight of cement.

The antistrain agent according to the present invention is for reducing the plastic deformation of the concrete composition.

It is recommended that the anti-strain agent include polyethylene, ethylene vinyl acetate, polybutene, high-impact polystyrene, or a mixture thereof, and the amount of the anti-strain agent is 5 to 30 parts by weight based on 100 parts by weight of cement.

At this time, if the amount of the anti-strain agent is less than 5 parts by weight, the effect of preventing deformation is insignificant, and if it exceeds 30 parts by weight, there is a problem that mixing with other components is not easy when producing concrete.

The high-performance water reducing agent according to the present invention is a admixture used to even out small air bubbles in concrete when constructing concrete, and has good foaming properties, thereby generating small bubbles evenly in concrete, and freezing melting resistance, corrosion resistance, and durability. Etc.

In particular, the water reducing agent is added to the premixed base concrete and stirred to make it softer, and is used for the purpose of improving the constructability of the concrete without degrading the quality of the concrete.

In addition, the water reducing agent has a secondary effect such as to improve the fluidity of the concrete composition to facilitate the pouring operation, to lower the thermal conductivity of the hard concrete, to improve the water-tightness.

At this time, the water-reducing ratio of the water reducing agent used in the concrete composition is generally about 10 to 15%, of which the water reduction ratio is 20 to 30%.

The preferred high performance water reducing agent is preferably composed of naphthalene type, melamine type, polycarboxylic acid type, amino sulfonic acid type reducing agent or a mixture thereof, and the content thereof is not particularly limited and may be appropriately adjusted as necessary, for example, 100 weight of cement. 0.01 to 10 parts by weight based on parts may be used.

At this time, typical examples of the naphthalene-type sensitizer are modified lignin, alkylarylsulfonic acid and active sustained polymers, polyalkylylsulfonic acid salts and reactive polymers, alkylarylsulfonate polycondensates, polysulfonic acid group-containing polycyclic polymers, alkylnaphthalenesulfonic acid salts, alkylaryls And sulfonate-modified lignin co-condensates and modified lignin, lignin derivatives and alkylarylsulfonates or at least one selected from these.

Typical examples of the melamine type water reducing agent include modified methyl melamine condensate, a water-soluble special polymer compound, a sulfonated melamine high condensate, or one or more mixtures thereof.

Typical examples of the polycarboxylic acid type reducing agent include copolymers or salts thereof containing unsaturated carboxylic acid monomers as a single component, such as poly (alkylene glycol) monoacrylate, poly (alkylene glycol) monomethacrylate, maleic anhydride and Copolymers of styrene, copolymers of acrylates or methacrylates, copolymers derived from monomers copolymerizable with these monomers, and the like.

Representative examples of the amino sulfonic acid type reducing agent include aromatic aminosulfonic acid polymer compounds, aromatic polymer condensates and lignin sulfonic acid derivatives, or at least one or more mixtures thereof selected from them.

In addition, a preferred high performance water reducing agent is a naphthalene type high performance water reducing agent alone or a mixed composition consisting of 80 to 95% by weight of a naphthalene-based high performance water reducing agent, 5 to 20% by weight of a polycarboxylic acid type high performance water reducing agent.

The amount of the high performance water reducing agent is preferably such that the total amount of air in the concrete is about 4 to 6% by volume. Too much use is not only economical, but also causes various obstacles such as a decrease in the compressive strength and a decrease in the bond strength with the rebar.

The concrete composition according to the present invention, in particular, the concrete composition for the S / C joint of the bridge may further include one or more kinds of adducts carried out in the following specific embodiments.

In a particular embodiment, the concrete composition according to the present invention, in particular the concrete composition for the S / C joint of the bridge to have excellent adhesion, while maintaining excellent binder properties and mechanical properties cracks and even after rapid curing after pouring In order to significantly improve the dropout phenomenon, it may further include 5 to 60 parts by weight of the acrylic resin based on 100 parts by weight of cement.

Preferred acrylic resins are acrylic acid, methacrylic acid, acrylate, methyl methacrylate, acrylic copolymer resin or mixtures thereof.

Here, the methyl methacrylate is obtained by mixing 49 to 70% by weight of a low viscosity methyl methacrylate resin having a viscosity of 10 to 1,000 cps and 20 to 50% by weight of a high viscosity methyl methacrylate having a viscosity of 2,000 to 20,000 cps. Modified methyl methacrylate may be used in which a methyl methacrylate mixture is mixed with 1 to 10% by weight of one or more mixtures selected from SIS (stylene isoprene stylene), SBR (stylene butadiene rubber) and SBS (stylene butadiene stylene).

In this case, when the content of the SIS, SBR and / or SBS is less than 1% by weight, cracks may occur due to the impact resistance decrease at the time of addition, and when the content exceeds 10% by weight, the viscosity of the modified methyl methacrylate resin is increased. This is undesirable because it may cause problems in workability.

In another specific embodiment, the concrete composition for the S / C joint of the bridge according to the present invention may further comprise 0.1 to 5 parts by weight of a retardant based on 100 parts by weight of cement to control the working time and / or the rate of strength expression. .

As a preferable retarder, organic acids, such as tartaric acid, citric acid, gluconic acid, boric acid, tartaric acid, and organic acid salts, such as sodium citrate and sodium gluconate, are preferable, and sodium citrate is more preferable.

As another specific aspect, the concrete composition for the S / C joint of the bridge according to the present invention may further comprise 5 to 20 parts by weight of powder based on 100 parts by weight of cement to serve as a binder.

The powder includes a ceramic binder, silica sand or a mixture thereof in powder form, and the particle size of the powder is not particularly limited, but preferably has a micrometer or several nanometer units.

Here, the composition of the ceramic binder and silica sand constituting the powder is preferably used more than 40% by weight of the binder, based on 100% by weight of the total powder, the remaining amount of silica is 60% by weight according to the user's choice It is adjustable.

However, the powder may be composed of only silica sand without using the ceramic binder.

The ceramic binder is preferably used sodium silicate, potassium silicate, lithium silicate or a mixture of at least one of them.

Here, as the amount of the ceramic binder increases, the color, weather resistance and adsorptive power, and the coloring effect increase, and absorb the carbon dioxide floating in the air to effectively clean the air and absorb the entire ultraviolet wavelength region and the visible wavelength region. Can serve as a UV stabilizer.

In another specific embodiment, the concrete composition for the S / C joint of the bridge according to the invention may further comprise 1 to 10 parts by weight of a leveling agent based on 100 parts by weight of cement.

The leveling agent is added to improve the self-leveling (self-filling performance) of the paste, any one or more selected from polyoxide, urethane and polycarboxylic acid may be used, but is not limited thereto. The kind used as may be used.

In another specific embodiment, the concrete composition for the S / C joint of the bridge according to the present invention may further comprise 1 to 10 parts by weight of a low shrinkage agent based on 100 parts by weight of cement.

At this time, the low shrinkage agent to prevent the concrete composition for the S / C joint of the bridge shrinkage.

Although it does not specifically limit as a preferable low storage agent, It is good to use the polyester type low storage agent and the low storage agent which consists of especially unsaturated polyester resin.

In another specific embodiment, the concrete composition for the S / C joint of the bridge according to the invention may further comprise 1 to 5 parts by weight of the anti-deterioration agent based on 100 parts by weight of cement.

Here, the anti-deterioration agent is to prevent the deterioration of the concrete composition for the S / C joint of the bridge, any of the conventional anti-degradation agent in the art having this purpose may be used.

Preferred antidegradants, in particular ozone deteriorants, are 6PPD (N- (1,3-dimethylutyl) -N'-phenyl-p-phenylenediamine) and / or TAPDT (2,4,6-tris- (N-

The accelerated degradation of concrete compositions by oxidation of ozone radicals activated in water, including 1,4-dimethylpentyl-p-phenylenediamino) -1,3,5-triazine), combined with amines in the molecular structure of The double bond portion of the aromatic cyclic macromolecule may be offset by ozone radicals activated by free electron transfer, thereby preventing deterioration and deterioration of the concrete composition.

That is, the ozone deterioration inhibitor may use a phenylene diamine-based wax, use a mixed resin composition containing 6PPD and TAPDT, or use an aromatic polyamine-based active radical generation, in particular phenylenediamine Preference is given to using a system.

In another specific embodiment, the concrete composition for the S / C joint of the bridge according to the present invention absorbs water when mixing the concrete composition to improve workability, thereby reducing the number of units in the concrete and absorbing polymer excellent in strength It may further include.

As the absorbent polymer, any one or more selected from polyacrylates and derivatives thereof and polyethylene oxide derivatives may be used, and the amount of the absorbent polymer may be 2 to 15 parts by weight based on 100 parts by weight of cement.

In another specific embodiment, the concrete composition for the S / C joint of the bridge according to the present invention may further comprise octyltriethoxysilane to improve the adhesion and adhesion strength of the concrete composition.

The octyltriethoxysilane may be used in the form of a monomer, and the molecular weight of the monomer is not particularly limited, but preferably 150 to 450 Da, and the amount thereof is 5 to 20 parts by weight based on 100 parts by weight of cement. I recommend you.

In another specific embodiment, the concrete composition for the S / C joint of the bridge according to the invention further comprises sodium bentonite in 1 to 3 parts by weight based on 100 parts by weight of cement in order to densify voids, prevent leakage and improve strength can do.

The sodium bentonite absorbs a large amount of water and expands to several times its original volume and becomes a gel-like state to densely fill the pores of the composition, thereby preventing leakage and improving strength, thereby contributing to crack prevention.

Concrete composition for S / C joint of the bridge according to the present invention 20 to 60 parts by weight of modified silane silicate composite based on 100 parts by weight of cement in order to improve crack resistance, water resistance, fouling resistance, wear resistance and / or adhesion It may further include.

Here, the modified silane silicate composite can enhance the adhesiveness of the composition by forming an organic-inorganic polymerization reactivity while acting as a crosslinking role.

The modified silane silicate composite may be prepared by mixing silicate and silane.

Preferred silicates may be any silicate commonly used in the art, but more preferably alkali silicates, particularly preferably lithium silicates, pure potassium silicates, pretreated potassium silicates, synthetic silicates (lithium, sodium silicate) , Potassium), colloidal silica or mixtures of at least one selected from them. However, it is not limited thereto.

Preferred silanes may be used as long as silanes commonly used in the art, but are preferably vinyltrichloro of aminosilane, vinylsilane, epoxy silane, methacrylsilane, sulfur, alkylsilane, phenylsilane and chlorosilane. Silane, normalhexyltriethoxysilane, aminoethylaminopropylsilane, phenyltrimethoxysilane, vinylbenzylaminoethylaminopropyltrimethoxysilane, methyldimethoxysilane, methacryloxypropyltrimethoxysilane, aminoethylamino Preference is given to using propyltrimethoxysilane, vinyltrimethoxysilane, tetraethoxysilane (TEOS), triglycidoxypropyltrimethoxysilane, aminopropyltrimethoxysilane or mixtures of at least one selected from these. However, it is not limited thereto.

On the other hand, the method of preparing the modified silane silicate composite by mixing the silicate and the silane with each other is not particularly limited, but is preferably based on 100 parts by weight of silicate, 0.1 to 2 parts by weight of the silane in the temperature range of 95 to 110 ℃ Dilution at includes stirring for 1-2 hours at a rate of 200-400 rpm.

In another specific embodiment, the concrete composition according to the present invention may further comprise 1 to 5 parts by weight of zinc oxide based on 100 parts by weight of cement to promote the curing of the composition and to prevent corrosion, if the amount is less than 1 part by weight It is poor in corrosion protection, and when it exceeds 5 parts by weight, adhesion is poor due to the rapid reaction of the composition, and cracks are not good.

In another specific embodiment, the concrete composition according to the present invention may further include 1 to 5 parts by weight of trimethylolpropane triacrylate based on 100 parts by weight of cement to improve the hardness of the composition and reduce surface contamination.

In another specific embodiment, the concrete composition according to the present invention is to accelerate the dissolution of the composition to increase the initial heat of reaction to accelerate the setting hardening to secure the initial strength by 1 to 5 parts by weight of potassium phosphate based on 100 parts by weight of cement If more than 5 parts by weight based on 100 parts by weight of cement may be further included in the shrinkage due to the fastening performance may cause cracks, if less than 1 part by weight hydrolysis rate is lowered, the strength is not good.

In another specific embodiment, the concrete composition according to the present invention may further include 1 to 5 parts by weight of ammonium nonylphenol ether sulfate (based on 100 parts by weight of cement) to improve the filling and durability of the composition. have.

In another specific embodiment, the concrete composition according to the present invention may further include sodium bicarbonate in an amount of 1 to 5 parts by weight based on 100 parts by weight of cement in order to suppress the rapid reaction when mixing the composition to improve the stability of the reaction.

In another specific embodiment, the concrete composition according to the present invention may further include 1 to 8 parts by weight of polyvinylidene fluoride resin based on 100 parts by weight of cement to provide workability, adhesion and stability.

In another particular embodiment, the concrete composition according to the present invention further comprises an amino functional siloxan to effectively cure at room temperature and provide improved properties such as heat resistance, low temperature performance, chemical resistance, solvent resistance and oil resistance. Can be.

The amino-containing siloxane is not particularly limited, and examples thereof include aminomethyl polydimethylsiloxane, and the amount of the amino-containing siloxane is preferably 1 to 10 parts by weight based on 100 parts by weight of cement.

In another specific embodiment, the concrete composition according to the present invention may further comprise 0.1 to 4 parts by weight of starch ether based on 100 parts by weight of cement in order to improve self-leveling (self-filling performance).

In another specific embodiment, the concrete composition according to the present invention may further include 1 to 5 parts by weight of butyl glycidyl ether based on 100 parts by weight of cement in order to adjust the viscosity and improve adhesion. have.

In another specific embodiment, the concrete composition according to the present invention may further include calcinated pozzolana (calcinated pozzolana) in an amount of 1 to 5 parts by weight based on 100 parts by weight of cement to improve the waterproof performance of the composition. It is prepared by adding calcium to a natural pozzolana composed mainly of fine red volcanic soil. In particular, the calcined pozzolana is a natural pozzolana or a mixture of 1 to 20 parts by weight of calcium and 100 to 1200 ° C. It is preferable to use the pulverized so that the average particle size is 10 to 20㎛ after firing for 0.5 to 1 hour in the temperature range of.

In another specific embodiment, the concrete composition according to the present invention is a polymethylsilsesquioxane (polymetylsilsesquioxane) 1 to 100 parts by weight of cement to improve the adhesion of the concrete composition and to fill the pores of the construction surface on which the concrete composition is constructed It may further comprise 8 parts by weight.

In another specific embodiment, the concrete composition according to the present invention is cemented with tetraethyl orthosilicate (TEOS) in order to minimize the penetration of rainwater, etc. to the construction surface where the concrete composition is constructed to excellent permeability resistance It may further comprise 1 to 8 parts by weight based on 100 parts by weight.

In another specific embodiment, the concrete composition according to the present invention 100 parts by weight of polyvinyl pyrrolidone (polyvinyl pyrrolidone) in order to ensure that the concrete composition can be dispersed stably and to maintain the stability by absorbing and swelling moisture It may further include 2 to 8 parts by weight as a standard.

In another specific embodiment, the concrete composition according to the present invention further comprises sodium rosinate in an amount of 1 to 3 parts by weight based on 100 parts by weight of cement in order to improve the dispersibility of the concrete composition and to avoid entanglement even after mixing of the composition. can do.

The construction method using the concrete composition for the S / C joint of the bridge according to the present invention having such a configuration is not particularly limited as long as the construction method of the concrete composition for the S / C joint of the bridge in the art, but the present invention In order to explain more easily, such an example will be described.

First, the concrete composition construction method for the S / C joint of the bridge according to the present invention comprises a hole installation step of installing a concrete placing hole, vibration compacting hole and air vent hole in the construction surface of the bridge to be constructed;

A foreign material removal-cleaning step of removing and cleaning the foreign matter on the construction surface at which the hole installation step is completed;

50 to 1,000 parts by weight of aggregate, 1 to 30 parts by weight of blast furnace slag fine powder, 1 to 20 parts by weight of fly ash, 0.5 to 5 parts by weight of cement based on 100 parts by weight of the concrete pouring hole of the construction surface where the foreign material removal-cleaning step is completed 10 parts by weight, shrinkage reducing agent 5 to 20 parts by weight, slump reducing agent 5 to 15 parts by weight, nano ceramic particles 10 to 30 parts by weight, silica fume 5 to 20 parts by weight, fibers 2 to 20 parts by weight, antioxidant 0.1 to Mixing water and concrete composition for the S / C joint of the bridge comprising 5 parts by weight, 3 to 20 parts by weight of adhesion promoter, 0.5 to 10 parts by weight of stabilizer, 5 to 30 parts by weight of anti-strain agent, and 0.01 to 10 parts by weight of high performance water reducing agent Pouring after pouring;

A vibration compacting step by inserting a vibration compaction device into the vibration compacting hole and vibrating the vibration after the pouring step is finished; And

It includes a curing step of curing the concrete composition after the vibration compacting step is finished.

Here, the curing step may further include an air vent finishing step of removing the air pockets generated during pouring by injecting an epoxy resin to discharge the air to the air vent hole after the curing step is finished in the rear end.

On the other hand, in order to increase the injection effect before the epoxy injection can be performed to separate the joint surface with a fishing line installed before concrete pouring.

Hereinafter, the present invention will be described in detail through examples. However, the following examples are only for illustrating the present invention in detail and are not intended to limit the scope of the present invention by these examples.

Example 1

Portland cement 100g, 200g of crushed fine aggregate with average particle diameter of about 3mm, 300g of crushed coarse aggregate with average particle diameter of about 5mm, 15g of blast furnace slag powder with powder density of about 5,000cm ² / g and density of about 3.1g / cm ³ , fineness of about 2.2g / cm ³ of the fly ash 10g, polycarboxylic acid 5g, 10g ethylene glycol, potassium silicate, 10g, having an average particle diameter of about 400nm of silicon carbide 20g, 10g of silica fume having an average particle size of about 10㎛, natural cellulose fibers High performance water reducing agent consisting of 10 g, 2.2 g methylenebis (4-methyl-6-t-butylphenol), 15 g hydroxy ethyl acryloyl phosphate, 7 g yellow-free polyurea resin, 15 g polybutene, and polymonoacrylate 2 g were mixed to prepare a concrete composition for the S / C joint of the bridge.

Example 2

The same procedure as in Example 1 was carried out except that 30 g of acrylate was further added.

Example 3

The same method as in Example 1, except that 30g of methyl methacrylate was used instead of 30g of acrylate.

Example 4

The same procedure as in Example 1 was carried out except that 3 g of tartaric acid was added.

Example 5

The same procedure as in Example 1 was carried out except that 10 g of a mixture of sodium silicate and silica sand was mixed at a weight ratio of 5: 5.

Example 6

The same procedure as in Example 1 was conducted except that 5 g of polyoxide was added.

Example 7

The same procedure as in Example 1 was carried out, except that 3 g of a deterioration inhibitor containing 6PPD was added.

Example 8

The same procedure as in Example 1 was conducted except that 7 g of polyacrylate was added.

Example 9

The same procedure as in Example 1 was conducted except that 10 g of octyltriethoxysilane having an average molecular weight of about 200 Da was added.

Example 10

The same procedure as in Example 1 was conducted except that 2 g of sodium bentonite was further added.

Example 11

In the same manner as in Example 1, 1 g of silane was diluted to 100 g of the silicate at a temperature in the range of 100 ° C., and 40 g of the modified silane silicate compound, which was solidified by stirring at a speed of about 300 rpm for 1 hour.

Example 12

The same procedure as in Example 1 was conducted except that 3 g of zinc oxide was further added.

Example 13

The same procedure as in Example 1 was carried out except that 3 g of trimethylolpropane triacrylate was further added.

Example 14

The same procedure as in Example 1 was carried out except that 3 g of potassium phosphate was added.

Example 15

The same procedure as in Example 1 was conducted except that 3 g of ammonium noniphenol ether sulfate was further added.

Example 16

The same procedure as in Example 1 was carried out except that 3 g of sodium bicarbonate was further added.

Example 17

The same procedure as in Example 1 was carried out except that 3 g of polyvinylidene fluoride resin was added.

Example 18

The same procedure as in Example 1 was conducted except that 3 g of aminomethylpolydimethylsiloxane was further added.

Example 19

The same procedure as in Example 1 was carried out, with the addition of 2 g of starch ether.

Example 20

The same procedure as in Example 1 was conducted except that 3 g of butylglycidyl ether was further added.

Example 21

In the same manner as in Example 1, 10 g of calcium was mixed with 100 g of natural pozzola and then calcined at 1100 ° C. for 0.5 hour, followed by further adding 2 g of calcined fossolola with a mean particle size of 15 μm.

Example 22

The same procedure as in Example 1 was conducted except that 4 g of polymethylsilsesuccioxane was further added.

Example 23

The same procedure as in Example 1 was carried out except that 5 g of tetraethyl orthosilicate was added.

Example 24

The same procedure as in Example 1 was conducted except that 7 g of polyvinylpyrrolidone was further added.

Example 25

The same procedure as in Example 1 was conducted except that 2 g of sodium rosinate was further added.

Example 26

The same procedure as in Example 1 was carried out except that all the additional additions were added according to Examples 3 to 25.

[Experiment]

After mixing the composition prepared according to the embodiment with water to prepare concrete, mechanical properties, such as curing time, chemical curing time, compressive strength and the like were measured.

The results are shown in Table 1.

Waterproof Curing Time (hr) Chemical curing time (day) Compressive strength (MPa) Example 1 98 30 7 77 Example 2 99 31 7 78 Example 3 98 30 8 78 Example 4 99 29 6 78 Example 5 99 31 6 78 Example 6 99 30 7 76 Example 7 98 31 8 79 Example 8 99 30 7 78 Example 9 99 31 8 75 Example 10 98 29 6 77 Example 11 99 28 8 78 Example 12 99 29 7 77 Example 13 99 30 6 76 Example 14 99 31 7 77 Example 15 99 30 6 79 Example 16 99 31 7 75 Example 17 99 29 6 79 Example 18 99 31 8 76 Example 19 98 30 8 77 Example 20 99 29 8 78 Example 21 99 29 7 77 Example 22 99 30 7 77 Example 23 98 31 7 77 Example 24 99 30 6 79 Example 25 98 31 8 78 Example 26 99 30 7 78

As shown in Table 1, the concrete composition for the S / C joint of the bridges prepared according to Examples 1 to 26 has good waterproofness, fast curing speed, and the compressive strength satisfies the physical properties required by concrete. appear.

As described above, those skilled in the art to which the present invention pertains will understand that the present invention may be implemented in other specific forms without changing the technical spirit or essential features. Therefore, it should be understood that the embodiments described above are all illustrative and not restrictive. The scope of the present invention should be construed as being included in the scope of the present invention all changes or modifications derived from the meaning and scope of the appended claims rather than the detailed description and equivalent concepts thereof.

Claims (5)

Based on 100 parts by weight of cement,
Aggregate 50 to 1,000 parts by weight;
Blast furnace slag fine powder 1 to 30 parts by weight;
1 to 20 parts by weight of fly ash;
0.5 to 10 parts by weight of a glidant;
5 to 20 parts by weight of shrinkage reducing agent;
5 to 15 parts by weight of slump reducing agent;
10 to 30 parts by weight of nanoceramic particles;
5 to 20 parts by weight of silica fume;
2 to 20 parts by weight of fibers;
0.1 to 5 parts by weight of antioxidant;
3 to 20 parts by weight of adhesion promoter;
Stabilizer 0.5 to 10 parts by weight;
5 to 30 parts by weight of a strain inhibitor; And
In the concrete composition for S / C joint of the bridge containing 0.01 to 10 parts by weight of a high performance water reducing agent,
Deterioration inhibitor further comprises 1 to 5 parts by weight based on 100 parts by weight of cement,
The absorbent polymer further comprises 2 to 15 parts by weight based on 100 parts by weight of cement,
Octyl triethoxysilane further comprises 5 to 20 parts by weight based on 100 parts by weight of cement,
Sodium bentonite further comprises 1 to 3 parts by weight based on 100 parts by weight of cement,
Further comprising 20 to 60 parts by weight of the modified silane silicate composite based on 100 parts by weight of cement,
Zinc oxide further comprises 1 to 5 parts by weight based on 100 parts by weight of cement,
Further comprises 1 to 5 parts by weight of trimethylolpropane triacrylate based on 100 parts by weight of cement,
Potassium phosphate further comprises 1 to 5 parts by weight based on 100 parts by weight of cement,
Ammonium noniphenol ether sulfate further comprises 1 to 5 parts by weight based on 100 parts by weight of cement,
Sodium bicarbonate further comprises 1 to 5 parts by weight based on 100 parts by weight of cement,
Further comprising 1 to 8 parts by weight of polyvinylidene fluoride resin based on 100 parts by weight of cement,
Further comprising 1 to 10 parts by weight of amino group-containing siloxane based on 100 parts by weight of cement,
Starch ether further comprises 0.1 to 4 parts by weight based on 100 parts by weight of cement,
Polymethylsilsesuccioxane further comprises 1 to 8 parts by weight based on 100 parts by weight of cement,
Tetraethyl orthosilicate further comprises 1 to 8 parts by weight based on 100 parts by weight of cement,
Polyvinylpyrrolidone further comprises 2 to 8 parts by weight based on 100 parts by weight of cement,
Concrete composition for the S / C joint of the bridge further comprises 1 to 3 parts by weight of sodium rosinate based on 100 parts by weight of cement.
delete delete A hole installation step of drilling a concrete placing hole, a vibration compaction hole, and an air vent hole in the construction surface of the bridge to be constructed;
A foreign material removal-cleaning step of removing and cleaning the foreign matter on the construction surface at which the hole installation step is completed; A hole installation step of drilling a concrete placing hole, a vibration compaction hole, and an air vent hole in the construction surface of the bridge to be constructed;
A foreign material removal-cleaning step of removing and cleaning the foreign matter on the construction surface at which the hole installation step is completed;
50 to 1,000 parts by weight of aggregate, 1 to 30 parts by weight of blast furnace slag fine powder, 1 to 20 parts by weight of fly ash, 0.5 to 5 parts by weight of cement based on 100 parts by weight of the concrete pouring hole of the construction surface where the foreign material removal-cleaning step is completed 10 parts by weight, shrinkage reducing agent 5 to 20 parts by weight, slump reducing agent 5 to 15 parts by weight, nano ceramic particles 10 to 30 parts by weight, silica fume 5 to 20 parts by weight, fibers 2 to 20 parts by weight, antioxidant 0.1 to Deterioration inhibitor in the concrete composition for S / C joints of the bridge comprising 5 parts by weight, 3 to 20 parts by weight of adhesion promoter, 0.5 to 10 parts by weight of stabilizer, 5 to 30 parts by weight of deformation inhibitor, and 0.01 to 10 parts by weight of high performance water reducing agent To 1 to 5 parts by weight based on 100 parts by weight of cement, and further includes 2 to 15 parts by weight based on 100 parts by weight of cement, and based on 100 parts by weight of octyl triethoxysilane. Further comprising 5 to 20 parts by weight, sodium bentonite further comprises 1 to 3 parts by weight based on 100 parts by weight of cement, further comprises 20 to 60 parts by weight of modified silicate composite based on 100 parts by weight of zinc oxide, zinc oxide 1 to 5 parts by weight based on 100 parts by weight of cement, further comprises 1 to 5 parts by weight of trimethylolpropane triacrylate based on 100 parts by weight of cement, 1 to 5 based on 100 parts by weight of potassium phosphate It further comprises by weight, further comprises 1 to 5 parts by weight of ammonium noniphenol ether sulfate based on 100 parts by weight of cement, 1 to 5 parts by weight of sodium bicarbonate, based on 100 parts by weight of cement, polyvinylidene fluoride The resin further comprises 1 to 8 parts by weight based on 100 parts by weight of cement, based on 100 parts by weight of the amino group-containing siloxane Further comprising 1 to 10 parts by weight, starch ether further comprises 0.1 to 4 parts by weight based on 100 parts by weight of cement, polymethylsilsesuccioxane further comprises 1 to 8 parts by weight based on 100 parts by weight of cement, Tetraethyl ortho silicate is further included in 1 to 8 parts by weight based on 100 parts by weight of cement, polyvinyl pyrrolidone further comprises 2 to 8 parts by weight based on 100 parts by weight of cement, sodium rosin acid by 100 parts by weight of cement A pour step of pouring after mixing the concrete composition for the S / C joint of the bridge with more than 1 to 3 parts by weight;
A vibration compacting step by inserting a vibration compaction device into the vibration compacting hole and vibrating the vibration after the pouring step is finished; And
Construction method of the concrete composition for the S / C joint of the bridge comprising a curing step of curing the concrete composition after the vibration compacting step is finished.
The method of claim 4, wherein
After the curing step is finished, the method of constructing a concrete composition for the S / C joint of the bridge further comprises an air vent finishing step of removing the air pocket generated when pouring by injecting epoxy resin to discharge the air to the air vent hole.