KR102413406B1 - Eco-friendly mortar composition for material after new bridge joint device with improved crack resistance and freeze melting resistance - Google Patents

Abstract

The present invention relates to an eco-friendly mortar composition for the rear material of a bridge expansion joint device with improved crack resistance and freeze-thaw resistance. As it is possible to improve chemical properties, improve adhesion, improve durability, and improve freeze-thaw resistance, it is used as a secondary material for bridge expansion joints where expansion and contraction is repeated depending on the temperature of the outside air. It relates to a mortar composition for a lure material for a joint device.

Description

Eco-friendly mortar composition for material after new bridge joint device with improved crack resistance and freeze melting resistance

The present invention relates to an eco-friendly mortar composition for the rear material of a bridge expansion joint device with improved crack resistance and freeze-thaw resistance. As it is possible to improve chemical properties, improve adhesion, improve durability, and improve freeze-thaw resistance, it is used as a secondary material for bridge expansion joints where expansion and contraction is repeated depending on the temperature of the outside air. It relates to a mortar composition for a lure material for a joint device.

In general, long bridges with piers have a plurality of bridge decks installed one after the other in the longitudinal direction to cope with the contraction or expansion of the bridge due to temperature changes, and a bridge expansion joint is installed between each end and the ends of the consecutively installed bridge decks. is installed

The reason for installing the bridge expansion joint between each end of the bridge deck as described above is to compensate for the shrinkage or expansion of the top plate due to temperature changes, absorb the shock applied to the top plate when the vehicle passes, and reduce the clearance space between the top plates. This is to induce smooth passage of vehicles by compensation and to provide a waterproof function that blocks rainwater from flowing into the lower part of the bridge.

In order to install the bridge expansion joint device between the bridge surface and the bridge surface, it is carried out by installing a rear member on the rear surface of the bridge expansion joint device.

Because the bridge expansion joint device repeats contraction and expansion according to the temperature difference of the outside air according to the season, the latter material is also prone to cracking, and may be damaged by rain or sewage, and cracks and corrosion due to freezing and thawing. Sometimes this happens.

When cracks and corrosion occur in this way, the bridge expansion joint must be replaced. Due to such replacement construction, the replacement construction may be hindered because traffic flow is disturbed and the replacement construction itself cannot be performed during the winter season. there is only

Accordingly, there are cases in which replacement work cannot be performed and is prevented, and in this case, there is a possibility that problems such as damage to the vehicle may occur.

Therefore, there is a great need for a technology that can extend the life of the bridge expansion joint device by using a second material with excellent properties such as crack resistance and freeze-thaw resistance that does not require frequent replacement work.

<Related prior art literature>

1. Republic of Korea Patent Application No. 10-2017-0135422

2. Korean Patent Application No. 10-2016-0108901

3. Korean Patent Application No. 10-2011-0060982

The present invention has been developed in consideration of the above circumstances, and to provide an eco-friendly mortar composition for the rear material of a bridge expansion joint device capable of improving eco-friendliness, crack resistance, chemical resistance, adhesion, durability, and freeze-thaw resistance. will be.

In addition, the present invention has high tensile strength, excellent hygroscopicity (excellent crack control performance), eco-friendliness, and biodegradability even during disposal to provide a technology that can provide pollution-free and excellent durability (acid resistance, chemical resistance) will be.

Another object of the present invention is to provide a technology capable of improving cation exchange properties, improving excellent adsorption properties, and increasing resistance to freezing and thawing.

However, the objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, one embodiment of the present invention is

100 parts by weight of fast-hardening binder, 0.1 to 10 parts by weight of fiber, 0.1 to 5 parts by weight of fine zeolite powder, 0.1 to 5 parts by weight of polypropylene resin, 0.1 to 5 parts by weight of expansion material, 0.1 to 5 parts by weight of polycarboxylic acid-based high fluidizing agent It consists of parts by weight, including 30 to 150 parts by weight of silica sand,

0.1 to 5 parts by weight of a water-soluble modified latex, 0.1 to 2 parts by weight of an alkoxysilane hydrolyzate, 0.1 to 3 parts by weight of a silicone liquid component,

0.5 to 10 parts by weight of clinker, 1 to 10 parts by weight of a mixture of dihydrate gypsum and hemihydrate gypsum, 0.5 to 10 parts by weight of plaster, 0.5 to 10 parts by weight of anhydrite, 0.1 to 5 parts by weight of silica fume, 0.01 to 5 parts by weight of fly ash, It contains a powder component comprising 0.5 to 10 parts by weight of limestone and 0.01 to 5 parts by weight of slag,

It provides an eco-friendly mortar composition for the rear material of a bridge expansion joint device, characterized in that it contains 0.1 to 2 parts by weight of an activation accelerator and 0.01 to 1 parts by weight of a lithium-based reaction accelerator.

In one embodiment of the present invention, the fast-hardening binder is composed of a mixture of Portland cement in a weight ratio of 100 weight ratio and a mixture of calcium aluminate, calcium sulfoaluminate, magnesium aluminate and magnesium sulfoaluminate in a weight ratio of 20-50. do.

In one embodiment of the present invention, the water-soluble modified latex is acrylic resin 10-20 parts by weight, SBR (Styrene-Butadiene rubber) rubber 10-20 parts by weight, hydroxyl acrylate monomer 0.1-5 parts by weight, unsaturated polyester resin 15-30 parts by weight, 0.1-5 parts by weight of gallic acid, 1-10 parts by weight of metal cations, 0.1-2.0 parts by weight of graphite solvent dispersion, 0.1-1.0 parts by weight of aluminum chloride, 0.5-5 parts by weight of dispersant, and 40-70 parts by weight of water It is characterized in that it is included and configured.

In one embodiment of the present invention, the siliconate-based liquid component is potassium methylsiliconate 0.1 to 5 weight ratio, 3-iodo-2-propynyl-N-butyl carbamate 0.1 to 5 weight ratio, epoxy-based binder resin 0.1 It is characterized in that it is included in a ratio of 0.1 to 5 weight ratio of inorganic polymer containing fluorine (F) group and 0.1 to 10 weight ratio.

The eco-friendly mortar composition for the rear material of the bridge expansion joint device according to an embodiment of the present invention is eco-friendly, improved crack resistance, improved chemical resistance, improved adhesion, improved durability, freeze-thaw by adding eco-friendly fiber, polypropylene resin, and fine zeolite powder The effect of improving resistance can be seen.

In addition, by containing eco-friendly fibers, it has excellent hygroscopicity (excellent crack control performance), eco-friendliness by using an eco-friendly solvent amine oxide, and biodegradability even at disposal. there is

In addition, by including the zeolite fine powder, there is an effect that can improve cation exchange properties, excellent adsorption improvement, and increase resistance to freeze-thaw.

In addition, it has excellent adhesion and durability between the bridge expansion joint device and the bridge surface, and in particular, has excellent properties such as chemical resistance, water resistance, and salt damage resistance, so that it is possible to extend the life of the bridge expansion joint device.

Hereinafter, preferred embodiments of the present invention will be described in detail. In the following description of the present invention, if it is determined that a detailed description of a related well-known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

The eco-friendly mortar composition for the rear material of the bridge expansion joint device according to the present invention is a fast-hardening binder, eco-friendly fiber, fine zeolite powder, polypropylene resin, expansion material, polycarboxylic acid-based high fluidizing agent, silica sand, a liquid component, It is composed by mixing the powder component and the accelerator component.

Specifically, 100 parts by weight of a fast-hardening binder, 0.1 to 10 parts by weight of fiber, 0.1 to 5 parts by weight of zeolite fine powder, 0.1 to 5 parts by weight of polypropylene resin, 0.1 to 5 parts by weight of an expansion material, and a polycarboxylic acid-based high fluidizing agent 0.1 to 5 parts by weight, including 30 to 150 parts by weight of silica sand,

0.1 to 5 parts by weight of a water-soluble modified latex, 0.1 to 2 parts by weight of an alkoxysilane hydrolyzate, 0.1 to 3 parts by weight of a silicone liquid component,

0.5 to 10 parts by weight of clinker, 1 to 10 parts by weight of a mixture of dihydrate gypsum and hemihydrate gypsum, 0.5 to 10 parts by weight of plaster, 0.5 to 10 parts by weight of anhydrite, 0.1 to 5 parts by weight of silica fume, 0.01 to 5 parts by weight of fly ash, It contains a powder component comprising 0.5 to 10 parts by weight of limestone and 0.01 to 5 parts by weight of slag,

It is formed by mixing an accelerator component comprising 0.1 to 2 parts by weight of an activity accelerator and 0.01 to 1 part by weight of a lithium-based reaction accelerator.

In the present invention, the fast-hardening binder may be manufactured using OPC (Portland cement) in general in consideration of field conditions, and if early strength is required, crude steel cement and alumina cement may be appropriately used. Specifically, it is possible to use a mixture composed of a mixture of 100% by weight of Portland cement and 20 to 50% by weight of a mixture of calcium aluminate, calcium sulfoaluminate, magnesium aluminate and magnesium sulfoaluminate.

Specifically, general Portland cement (OPC) has about C ₃ S 51%, C ₂ S 25%, C ₃ A 9%, C ₄ AF 9%, CaSO ₄ 4%, and a specific surface area of 3,300 cm ² It is preferable to use a thing around /g.

The calcium aluminate, calcium sulfoaluminate (CSA), magnesium aluminate and magnesium sulfoaluminate are cements with a relatively high alumina content compared to normal Portland cement, have excellent chemical resistance, and have the advantage of being usable in an acidic atmosphere. It is a type of crude steel cement with a short curing time, and can be used in an appropriate ratio with normal Portland cement.

In addition, the fast-hardening binder may further include blast furnace slag powder in an amount of about 1 to 10 parts by weight based on 100 parts by weight of Portlant cement, specifically, those having a density of 2.85 to 2.95 g/m ³ It can be used .

Blast furnace slag is a latent hydraulic material that cannot initiate a self-triggered hydration reaction just by contact with water like ordinary Portland cement. The penetration of water is prevented and no further reaction occurs. However, when stimulated by alkalis (Ca(OH) ₂ , KOH, NaOH) and sulfates (CaSO ₄ ), the thin gel film is destroyed, and it changes to a gel with an archipelago structure and begins to harden as ions are eluted and insoluble substances are precipitated from the blast furnace slag. However, when blast furnace slag is used in concrete, effects such as long-term strength improvement, watertightness improvement, hydration heat suppression and chemical resistance improvement can be seen compared to when only general portlant cement is used.

In the present invention, at least one or more of glass fiber, carbon fiber, aramid fiber, and eco-friendly fiber may be used as the fiber, and the eco-friendly mortar composition according to the present invention prevents sagging and cracks in the waterproofing film, and has excellent heat resistance and cold resistance can make it Here, the fiber can prevent cracks in the mortar and extend the lifespan by forming a tight structure with a fine network.

In the present invention, eco-friendly fibers may be used as the fibers, and specifically, lyocell fibers, cellulose fibers, PLA fibers, and the like may be used.

The Lyocell fiber is a representative environmentally friendly new fiber that does not use existing toxic chemicals such as carbon dioxide and caustic soda as a solvent. .

The lyocell fiber is manufactured by directly dissolving natural pulp in a non-polluting amine oxide solvent without any chemical modification, and uses only cellulose extracted without any chemical modification. It is characterized by no occurrence.

More specifically, the physical performance of lyocell fiber includes high tensile strength, excellent hygroscopicity (excellent crack control performance), eco-friendliness by using an eco-friendly solvent amine oxide, and biodegradability even at disposal, so pollution-free and excellent durability (acid resistance, resistance to acid) chemical properties).

The lyocell fiber may be used alone, but in order to improve strength, the PLA composite resin including the PLA composite coated with cellulose nanofibers and the lyocell fiber may be mixed in a weight ratio of 6 to 7: 3 to 4 and used.

That is, to produce PLA composites coated with cellulose nanofibers, cellulose nanofibers were prepared from commercial wood pulp (hardwood or softwood) with TEMPO((2,2,6,6-tetramethylpiperidin-1-yl)oxy) After oxidation using , one prepared by mechanical treatment (yield 90% or more) can be used, and the carboxyl group content is 3.2 to 3.9 mmol/g, the cellulose fiber width is 20 to 30 nm, and the fiber length is 50 to 60 μm. It is preferable to use

That is, the cellulose nanofibers may be produced by coating the surface of the PLA (PolyLactic Acid) composite in a mesh type, and it is preferable to use 15.2 to 17.4 parts by weight of the cellulose nanofiber as 100 parts by weight of the PLA composite.

When the surface treatment was performed by coating with a mesh type, which is a PLA composite coated with such cellulose nanofibers, tensile strength, bending strength, and rupture strength could all be improved compared to simply using a PLA composite.

In addition, the PLA composite coated with cellulose nanofibers has high specific surface area, specific strength, and low density of cellulose nanofibers, so it not only exhibits excellent physical properties, but also can obtain a composite with excellent thermal and mechanical properties with only a very small amount, and is environmentally friendly It can be applied with properties of strength and light weight.

On the other hand, PLA is a natural plant-based raw material with corn starch as the main raw material, does not contain synthetic resins (PC, ABS, etc.) and is 100% decomposed under natural conditions. In addition, it is possible to prevent the generation of harmful substances such as dioxins and other environmental pollution. PLA (PolyLactic Acid) can be used as a substitute for injection and extruded plastics, and can be commercialized as an innovative eco-friendly resin with general physical properties. On the other hand, PLA has properties such as crystallinity, natural circulation, biocompatibility, and CO ₂ reduction, and PLA is an eco-friendly material that can be decomposed naturally as a plant-based raw material.

PLA composite used in the present invention is PLA short fiber and carbon fiber in a weight ratio of 5.1 to 7.3: 1.2 to 2.3, put in a carding machine, and use the one produced in the form of a sheet by forming a web, or PLA corresponding to natural fiber It can be used by foaming a sheet layer prepared by mixing short fibers and synthetic fibers. As the synthetic fiber used in the present invention, low-melting polyester, polyester or polypropylene may be used alone or in combination, and polypropylene is preferably used. At this time, the mixing ratio of the synthetic fiber and the natural fiber is not particularly limited, but with respect to 100 parts by weight of the natural fiber, 12 to 15 parts by weight of the synthetic fiber, 2 to 3 parts by weight of loess, 2 to 5 parts by weight of tidal soil (mud), amphibole 1 to 2 parts by weight of the powder, 1.5 to 1.8 parts by weight of the ore powder, 4.2 to 4.5 parts by weight of the curing agent, and 20 parts by weight of water, and optionally the ore powder having a color may further include an ore powder having a desired color. The synthetic fibers in the mixing process of PLA short fibers and synthetic fibers may have a thickness of 20 to 30 denier, and a length of 43 to 56 nm.

On the other hand, on the PLA composite resin containing the PLA composite coated with cellulose nanofibers, the weight ratio of the PLA composite coated with cellulose nanofibers and the PLA resin is 3 to 4: Formed in 6 to 7, tensile strength, bending resistance, and The results of the measurement on the burst strength obtained a significant effect compared to other ratios.

Next, look at the fine powder of zeolite.

The synthetic zeolite used for the zeolite fine powder according to the present invention is made by slowly crystallizing silica alumina gel composed of a mixture of alkali, water and organic substrate. Synthetic production of zeolite not only has the advantage of obtaining a pure, uncontaminated final product (synthetic zeolite), but also allows synthetic zeolite to produce zeolite stronger than natural zeolite.

The performance of the fine zeolite powder used in the present invention is characterized by having cation exchange properties, excellent adsorption properties, and increased resistance to freezing and thawing.

First, looking at the cation exchange characteristics, one of the typical characteristics of zeolite is that cations are easily exchanged, and it has a selective exchange characteristic that can selectively exchange specific cations according to the size of the cavity. Due to these characteristics, it is used as a soil and water quality improvement agent, wastewater treatment, radioactive waste treatment, etc. In particular, in the case of mortar to which fine zeolite powder is added, it can show excellent performance because wastewater is always present due to the characteristics of the sewage structure.

Next, looking at the excellent adsorption property, the fine zeolite powder can selectively adsorb inorganic and organic molecules of a suitable size and shape, and thus has a molecular sieve function that can separate different molecules mixed with each other according to the size of the cavity (molecular sieve). sieving). Applications related to zeolite adsorption and molecular sieve properties include application as a precursor of various gases and removal of impure gases from natural gas and LPG. Due to this characteristic, a large amount of gas may exist in the case of sewage structures, so it is possible to secure stability during operation as well.

In addition, looking at the increase in resistance to freezing and thawing, synthetic zeolite is used as an additive in the production process of asphalt, and this utilization started in Germany in the 1990s. Synthetic zeolite fine powder helps lower the heat generated during asphalt manufacturing and installation, resulting in less carbon dioxide, aerosols and vapors. In addition, at high temperatures, the asphalt is compressed more tightly, making it possible to pave the road in cold weather or for long periods of time. This performance allows the mortar to be significantly less damaged when zeolite is added to the mortar even when exposed to low temperatures throughout the winter.

On the other hand, the fine zeolite powder according to the present invention is not used alone, but as another embodiment of the present invention, polyphenylene sulfide (PPS) is added to improve strength, heat resistance, chemical resistance and high chemical resistance, but the PPS resin is originally 20 to 30 parts by weight of polyamide resin, 1 to 5 parts by weight of N-methyl-2-pyrrolidone polymer as a solvent, 2 to 2 parts by weight of stone powder As 3 parts by weight, a zeolite fine powder composite resin comprising 5 to 7 parts by weight of heavy carbon and 30 to 40 parts by weight of metal hydroxide may be used.

Here, the stone powder does not contain asbestos, and by using Talcum corresponding to a silicate made of magnesium, the eco-friendly lyocell fiber containing the zeolite fine powder composite resin and the eco-friendly mortar composition containing the synthetic zeolite fine powder increase the strength, and the heavy carbon It may be included to enhance hiding power, act as extender pigments.

Then, the polypropylene resin is added to increase adhesion and reduce the amount of rebound. The polypropylene resin serves to increase fluidity and improve workability in the state before curing of the eco-friendly mortar composition according to the present invention, and increase surface adhesion, increase cohesion, and bend in the state after curing of the eco-friendly mortar composition according to the present invention. It exerts effects such as increase in strength, increase in flexibility, and increase in waterproofing power. The polypropylene resin used in the present invention preferably has a weight average molecular weight in the range of 10,000 to 500,000.

The expandable material is for suppressing cracking due to shrinkage during curing after application of the eco-friendly mortar composition according to the present invention. If it is less than the critical value, the expansion effect is small, so the crack suppression effect cannot be obtained.

The expansion material is 100 parts by weight of fiber reinforcement, 30 to 65 parts by weight of inorganic expansion material, 3 to 5 parts by weight of metal powder-based expansion material, 2 to 3 parts by weight of stabilizer, 25 to 35 parts by weight of strength enhancer, 15 to 25 parts by weight of alkali stimulant. Hybrid intumescent materials may be used.

That is, the inorganic expandable material constituting the hybrid expandable material is configured to suppress cracks caused by drying shrinkage after curing of the mortar by allowing expansion to compensate for the shrinkage after curing of the mortar.

This configuration is used in consideration of the shrinkage after hardening, which is a disadvantage of cement. If it is less than the critical value, the expansion effect is insignificant, so it is impossible to suppress shrinkage cracking. A problem of this sudden drop occurs.

In addition, the fiber reinforcement constituting the expansion material is used to improve and reinforce the mechanical properties while suppressing the increase in tensile force of the mortar and the generation and growth of local cracks.

Subsequently, the polycarboxylic acid-based high fluidizing agent adsorbs on the particle surface of the mortar and gives an electric charge to the particle surface to generate a mutual reaction force between the particles. plays a role in making

As the fluidizing agent, in addition to polycarboxylic acid, melamine selphonic acid, naphthalene selphonic acid, polycarboxylic acid, lignin sulfonic acid or alkylaryl sulfonic acid fluidizing agents may be used, and more specifically, lignin sulfonate, polynaphthalene sulfonate, polymelamine sulfonate. It is possible to use alone or a mixture of two or more from the group consisting of nate or polycarboxylate-based water reducing agents.

In particular, since it affects the setting time when using a fluidizing agent, it can be used by including an appropriate setting time adjusting agent.

Subsequently, the silica sand is used as a mortar mixture, and it is preferable to use fine sand having an average particle diameter of 0.3 to 1.5 mm, in order to improve the fluidity and compactness of the eco-friendly mortar composition according to the present invention.

Next, in the present invention, the water-soluble modified latex is a synthetic resin-based emulsion latex, specifically, 10 to 20 parts by weight of acrylic resin, 10 to 20 parts by weight of SBR (Styrene-Butadiene rubber) rubber, 0.1 to 5 parts by weight of hydroxyl acrylate monomer , unsaturated polyester resin 15-30 parts by weight, gallic acid 0.1-5 parts by weight, metal cation 1-10 parts by weight, graphite solvent dispersion 0.1-2.0 parts by weight, aluminum chloride 0.1-1.0 parts by weight, dispersant 0.5-5 parts by weight, and water 40- It is preferable to use what is included in the ratio of 70 weight ratio.

The acrylic resin is 2-hydroxyethyl methacrylic acid (2-HEMA: 2-hydroxyethyl methacrylate), methyl methacrylate (MMA: methyl methacrylate), n-butyl acrylate (n-BA: n-butyl acrylate) and A polyacrylate hybrid emulsion synthesized by adding an acrylate monomer selected from acrylic acid (AAc) and an anionic or nonionic emulsifier and an initiator may be used. The acrylic resin dries quickly and exhibits excellent weather resistance, durability, and UV stability even under external exposure conditions, and is eco-friendly because it is water-soluble.

In the SBR rubber, it is preferable to use a resin having a solid content of 50% or more in order to maintain elasticity. It serves to prevent corrosion on the surface and is dispersed in a solvent, and also serves to increase the effect of gallic acid by dispersing and dissolving the gallic acid in a solution state. As the solvent, an ethylene glycol-based dihydric alcohol may be used.

The hydroxyl acrylate monomer serves to increase the crosslinking density to increase the network state, thereby improving physical properties. As the hydroxyl acrylate monomer, hydroxyl ethyl acrylate, hydroxyl propyl acrylate, hydroxyl ethylmethyl acrylate, and the like may be used.

The unsaturated polyester is formed by condensation polymerization of an acid and a glycol compound, for example, an acid value of 18 to 20 mg/KOH formed by the reaction of fumaric acid and diethylene glycol may be used. The unsaturated polyester serves to enhance the weather resistance, light resistance, and scratch resistance of the mortar.

The gallic acid is a phenol carboxylic acid obtained by acid or alkali hydrolysis of tannin, and is a compound having a molecular formula of C7H6O5·H2O, and serves to improve rust prevention and waterproofing properties of the surface.

As a specific example, the metal cation may be one or two or more selected from Ca ²⁺ , Mg ²⁺ , Zn ²⁺ , Cu ²⁺ , Fe ²⁺ .

The graphite solvent dispersion serves to improve strength characteristics such as tensile strength and compressive strength, and at the same time serves to improve corrosion resistance and waterproofness.

In the present invention, the graphite solvent dispersion is preferably used in a form in which graphite particles are dispersed in a solvent.

The graphite powder has a very large specific surface area of about 2,000 to 3,500 m ² /g, has excellent tensile strength and high airtightness, and thus has excellent durability.

The graphite powder has a problem in that it is not easy to use because the fineness of the powder is too large, so it is preferable to use the graphite powder as a dispersion dispersed in a solvent.

In the present invention, in order to form the graphite solvent dispersion, graphite powder is mixed with water, stirred and dispersed at the pH of the acid region by adding an acid, and then adjusted to the pH of the neutral region by adding an alkali. The graphite content is 0.001 to 20 in the dispersion It is preferable to use what is included in weight %.

In the present invention, adding the acid (eg, hydrochloric acid, citric acid, acetic acid, etc.) is to improve dispersibility in a solvent, and adding an alkali (eg, NaOH, KOH, etc.) adjusts the pH to a neutral region to improve stability it is to make

In the present invention, in forming the graphite solvent dispersion, water is preferably used as the solvent, but alcohol can be used alone or mixed with water.

The aluminum chloride is formed by the reaction of an acid and aluminum hydroxide, and may also serve to improve chemical resistance.

The dispersing agent is to improve the uniformity by evenly dispersing the internal components in the liquid phase when the water-soluble latex is mixed. Either one can be used.

In the present invention, the alkoxysilane hydrolyzate is obtained by forming silane in the form of silica gel through a sol-gel process, putting methyl methacrylate in the pores of the silica gel thus obtained, and then polymerizing and hydrolyzing it. In the present invention, the content of methyl methacrylate may be included in the range of 0.5 to 5 parts by weight based on 100 parts by weight of the alkoxysilane content.

In addition, in the present invention, the siliconate-based liquid component is potassium methylsiliconate 0.1 to 5 weight ratio, 3-iodo-2-propynyl-N-butyl carbamate 0.1 to 5 weight ratio, epoxy-based binder resin 0.1 to 10 weight ratio, and It is constituted by including a fluorine (F) group-containing inorganic polymer in a ratio of 0.1 to 5 weight ratio.

In the present invention, the potassium methylsiliconate serves to permeate the reinforcing component of the mortar composition according to the present invention into the base concrete structure and to increase water repellency. In the present invention, the potassium methylsiliconate is preferably included in the range of 0.1 to 3 weight ratio in the siliconate-based liquid component. In the present invention, it is more preferable to use the potassium methylsiliconate having a solid content of 30 to 40% by weight and a pH of 12 to 14.

In addition, in the present invention, when the 3-iodo-2-propynyl-N-butyl carbamate is used in the mortar composition according to the present invention, various harmful components of concrete are prevented from leaching to the outside, thereby causing environmental pollution. has a preventive effect. In the present invention, the 3-iodo-2-propynyl-N-butyl carbamate is preferably included in the range of 0.1 to 5 weight ratio in the siliconate-based liquid component.

In addition, in the present invention, the epoxy-based binder resin serves to enhance the bonding force between each component of the composition and to increase the mechanical strength and watertightness of the inside of the concrete.

In the present invention, it is preferable to use the epoxy-based resin, and the content thereof is preferably included in the range of 0.1 to 10 weight ratio in the siliconate-based liquid component.

In addition, in the present invention, the inorganic polymer containing the fluorine (F) group serves to prevent corrosion of concrete by acid by enhancing acid resistance when the surface is exposed to acidic conditions after the mortar composition according to the present invention is applied. do In the present invention, the inorganic polymer containing the fluorine (F) group is preferably composed of a mixture of aluminosilicate and fluoro alkali silicate in a weight ratio of 50 to 65:35 to 50. When the content of the aluminosilicate is less than the above range, there is a problem of a decrease in strength, and when the content of the aluminosilicate exceeds the above range, cracks may occur due to dryness of the mortar.

In the present invention, the inorganic polymer containing the fluorine (F) group is preferably included in the range of 0.1 to 10 weight ratio in the siliconate-based liquid component. If the content is less than 0.1 weight ratio, the acid resistance strengthening effect is insignificant, and if it exceeds 10 weight ratio, compatibility may be a problem.

In the present invention, the clinker is composed of calcium silicate, such as alite, berite, and celite. The clinker serves to promote mixing of the powder component and the liquid component. The clinker is preferably included in the range of 0.5 parts by weight to 10 parts by weight. When the content of the clinker is less than 0.5 parts by weight, it is not easy to mix the powder component and the liquid component, and when it exceeds 10 parts by weight, the strength is There is a problem with degradation.

In the present invention, the dihydrate gypsum and hemihydrate gypsum serve to increase the viscosity to improve adhesion. The dihydrate gypsum and hemihydrate gypsum are preferably included in the range of 1 part by weight to 10 parts by weight. When the content is less than 1 part by weight, there is a problem in that the viscosity and adhesion are lowered, and when it exceeds 10 parts by weight, the strength There is a problem of lowering.

In the present invention, the plaster (plaster) serves to easily mix the components included in the powder component with the liquid component. The plaster is preferably included in the range of 0.5 parts by weight to 10 parts by weight. Therefore, when the content of the plaster is less than 0.5 parts by weight, there is a problem in that it is difficult for the various components included in the powder component to be easily mixed with the liquid component. , When it exceeds 10 parts by weight, there is a problem in that strength and chemical resistance are lowered.

The anhydrite is a mineral corresponding to the anhydride of calcium sulfate, and serves to improve adhesion when the powder component and the liquid component are mixed. The anhydrite is preferably included in the range of 0.5 parts by weight to 10 parts by weight. When the content of the anhydrite is less than 0.5 parts by weight, the adhesion of the mortar decreases, and when it exceeds 10 parts by weight, the chemical resistance decreases. there is a problem to be

The silica fume is an amorphous active silica and has an average particle diameter of about 0.15 μm, and is a particle close to a perfect spherical shape. Silica fume improves waterproofness and chemical resistance by the filling effect between powder component particles due to the characteristics of spherical particles, and plays a role in improving the strength of mortar. In particular, silica fume also serves to improve the adhesion performance of the mortar. The silica fume is preferably included in the range of 0.1 parts by weight to 5 parts by weight. When the content of silica fume is less than 0.1 parts by weight, there is a problem in that the waterproofness and chemical resistance of the mortar and the strength are lowered, and 5 parts by weight If it exceeds the negative, there is a problem that cracks may occur.

The fly ash is silicon oxide (SiO ₂ ) or aluminum oxide (Al ₂ O ₃ ) remaining in the form of oxides remaining after burning coal in facilities that use coal as fuel, such as thermal power plants. means that When the fly ash is mixed with the coating agent, workability is improved and long-term strength and watertightness are improved, which is economical. The fly ash is preferably included in the range of 0.01 parts by weight to 5 parts by weight. When the content of the fly ash is less than 0.01, the adhesion performance of the mortar is reduced, and when it exceeds 5 parts by weight, the chemical resistance is lowered. there is

The limestone serves to auxiliaryly improve the adhesion of the mortar composition according to the present invention. The limestone is preferably included in the range of 0.5 parts by weight to 10 parts by weight. When the content of the limestone is less than 0.5 parts by weight, the effect of improving adhesion is reduced, and when it exceeds 10 parts by weight, the chemical resistance is lowered. there is

The slag is a by-product generated in the process of manufacturing steel in a steel mill, etc., and the main component of the slag is alumina silicate, and when it is mixed with a powder component, it serves to increase the durability and chemical resistance of the mortar. In particular, slag has a low water permeability and serves to improve the waterproofness of the mortar according to the present invention. The slag is preferably included in the range of 0.01 parts by weight to 5 parts by weight. When the content of the slag is less than 0.01 parts by weight, there is a problem in that durability, chemical resistance and waterproofness are deteriorated, and when it exceeds 5 parts by weight, cracks This can occur and there is a problem with weight increase.

In the present invention, the activity promoter is used to control the initial setting rate, and serves to activate the function of the mortar and strengthen the adhesion performance, for example, active polyvalent metal ions of calcium, magnesium, manganese or aluminum. A chloride salt, carbonate salt, sulfate or oxalate salt containing may be used, and the amount used is preferably used in the range of 0.5 to 2 parts by weight.

In the present invention, the lithium-based reaction accelerator serves to promote the formation of cement hydrate after setting (termination), thereby affecting the strength expression and making the micropores dense, for example, lithium carbonate, lithium sulfate, lithium hydroxide, Lithium oxide, lithium chloride, lithium phosphate, lithium nitrate, lithium silicate, etc. may be used, and the amount thereof is preferably used in the range of 0.5 to 1 part by weight.

In addition, in order to exhibit a flame retardant effect in the mortar composition of the present invention, a flame retardant may be additionally included, and the flame retardant may be any one or a mixture of two or more of antimony molybdate, aluminum hydroxide, molybdenum oxide, and magnesium hydroxide. can In particular, aluminum hydroxide (Al(OH) ₃ ) becomes activated alumina when it is heated to 500℃ or higher and has adsorption performance. Therefore, it adsorbs harmful substances such as dioxin and hydrogen chloride gas (HCl) generated during combustion It has a cooling effect through endothermic reaction and is nonflammable so that it has excellent water and acid resistance, and it can be expected to improve the flame retardant effect by using flame retardants in combination.

In addition, the eco-friendly mortar composition for the after-treatment of the bridge expansion joint device according to the present invention may further include a filler. The filler may have a particle diameter of 2 μm or less, and may be a group consisting of silicon dioxide (SiO2), barium sulfate (BaSO4), aluminum oxide (Al2O3), calcium carbonate (CaCO3), talc, or a mixture thereof.

In the present invention, the eco-friendly mortar composition for the aftertreatment of the bridge expansion joint device may further include a functional filler.

As the functional filler, a mixture of silica powder and expandable graphite may be used.

As the silica powder, one or a mixture of two or more selected from colloidal silica, fumed silica, and micronized silica may be used.

The functional filler serves to increase the physical effect by serving to further increase the binding effect of the mortar composition. In the present invention, the mixing ratio of the silica powder and the expandable graphite is preferably mixed in a weight ratio of 100:50 to 200.

In addition, when using the functional filler, it is possible to use the powder directly, but by treating the surface with organosilane and coating it, the effect of increasing the durability due to the increase of the binding effect can be seen.

That is, silica powder alone or a mixture of expandable graphite powder is dispersed in an organic silane in a colloidal solution dispersed in a solvent, and then the treatment can be performed by stirring for about 1 to 10 hours. Specifically, based on 100 parts by weight of silica powder alone or a mixture solution of expandable graphite powder, about 0.1-50 parts by weight of organic silane is added to the solution to form organic groups on the surface of the powder particles in the solution, and passes through a reactor for dehydration and condensation reaction to form a powder surface-treated with organic groups. In this case, the solution is silica powder or expandable graphite powder dispersed in a colloidal state in a solvent such as water or alcohol, and it is preferable to contact the organic silane in a colloidal solution state.

Specific examples of the organosilane include dimethyldimethoxysilane, methyltrimethoxysilane, methyltriethoxysilane, and tetraethoxysilane. At this time, in the case of treating the surface of the powder with organic silane, stirring is performed at room temperature for 1 to 10 hours to form an inorganic material in which organic groups are formed, and passing it through a reactor. At this time, the reactor is a heating device, and the temperature is raised to 100 ~ 300 ℃, the solvent and the inorganic material formed with an organic group for 1 to 10 hours to dehydrate and condensation reaction to prepare the surface-treated powdered inorganic particles.

The silica powder and expandable graphite powder prepared in this way have excellent binding effect because silane is formed on the surface, and thus durability may be further improved.

In the present invention, the functional filler is preferably included in the range of 0.1 to 10 parts by weight.

Above, the eco-friendly mortar composition for the rear material of the bridge expansion joint device according to the present invention has been described in detail.

The mortar composition according to the present invention serves to improve durability by inhibiting penetration of degrading substances such as salt and acidic substances in various fields, and has excellent compatibility.

In addition, the eco-friendly mortar composition according to the present invention has excellent adhesion with the bridge expansion joint device and the bridge surface, there is no neutralization reaction with concrete, water resistance, ozone resistance, chemical resistance, waterproofness, air permeability, and is oxidized by ultraviolet rays. It has the advantage that the phenomenon does not occur.

In addition, the eco-friendly mortar composition composition according to the present invention has a dense density, excellent durability and waterproofness, and in particular prevents cracking of the matrix, which is repeatedly contracted and expanded according to temperature changes, and has excellent elasticity, so that it is suitable for work on vibrating parts. It has very good advantages.

In addition, the eco-friendly mortar composition composition according to the present invention blocks the penetration of carbon dioxide and blocks the penetration of water. The eco-friendly mortar composition composition according to the present invention has a low content of volatile organic compound (VOC), is environmentally friendly, has no air pollution, has high strength expression, has excellent early strength, and has excellent crack prevention ability due to the inclusion of fine particles. .

In addition, the eco-friendly mortar composition composition according to the present invention has excellent water resistance, weather resistance, chemical resistance, and contamination resistance, and exhibits the effect of protecting the mother body and the finished surface from chemical gas, exhaust gas, rainwater, and the like.

In addition, the eco-friendly mortar composition composition according to the present invention is excellent in smoothness, low-temperature stability (cracking resistance), odorless, exhibits a good dispersion action even when mixed with water, and maintains uniform strength as a whole and has high strength. In addition, it forms a high-density and dense tissue by good dispersion of powder components, so it has excellent chemical resistance (salt resistance, acid resistance) and suppresses penetration of water, oil, etc.

In addition, the eco-friendly mortar composition composition according to the present invention has excellent adhesion, is excellent in both short-term adhesion strength and long-term stability, and has the advantage that cracks do not occur due to an appropriate balance of strength and stability.

In addition, the eco-friendly mortar composition composition according to the present invention has excellent corrosion resistance to an acidic environment, and in particular, the growth of microorganisms is inhibited, so that the problems of strength reduction and contamination caused by microorganisms can be prevented, and it has an effect of improving weather resistance and surface strength. has the advantage that it can be maintained for a long time.

Hereinafter, the present invention will be described in more detail based on Examples. However, the scope of the present invention is not limited by the following examples.

(Example 1)

Based on 100 parts by weight of cement (OPC), 2 parts by weight of lyocell fiber, 3 parts by weight of fine zeolite powder, 1.5 parts by weight of polypropylene resin (weight average molecular weight 100,000), 0.2 parts by weight of expansion material, 0.5 parts by weight of polycarboxylic acid-based high fluidizing agent, Contains 100 parts by weight of silica sand, acrylic resin (15 weight ratio), SBR rubber (15 weight ratio), unsaturated polyester resin (20 weight ratio), hydroxyl acrylate monomer (1 weight ratio), gallic acid (1 weight ratio), metal cation (3 Weight ratio) Graphite solvent dispersion (1 weight ratio), aluminum chloride (0.5 weight ratio), and a dispersant (1 weight ratio) were mixed, and 8 parts by weight of a water-soluble modified latex obtained by mixing water was mixed. Next, 0.5 parts by weight of an alkoxysilane hydrolyzate obtained by forming silane in the form of silica gel and polymerizing and hydrolyzing methyl methacrylate in the pores of the silica gel is mixed, followed by 1 weight ratio of potassium methylsiliconate, 3-iodo-2 -Prophinyl-N-butyl carbamate 2 weight ratio, epoxy binder resin 5 weight ratio, and inorganic polymer containing a fluorine (F) group (a mixture of aluminosilicate and fluoro alkali silicate in a weight ratio of 60:40) 1 weight ratio 3 parts by weight of the siliconate-based liquid component obtained by mixing with After mixing parts, 7 parts by weight of limestone, and 3 parts by weight of slag, 1.0 parts by weight of an activation accelerator and 1.0 parts by weight of a reaction accelerator (a mixture of lithium carbonate, lithium sulfate, and lithium hydroxide) were mixed to prepare an eco-friendly mortar composition composition.

(Example 2)

Hybrid consisting of 100 parts by weight of fiber reinforcing material, 30 parts by weight of inorganic expansion material, 3 parts by weight of metal powder-based expansion material, 2 parts by weight of stabilizer, 25 parts by weight of strength enhancer, and 15 parts by weight of alkali stimulant as an expansion material, but prepared in the same manner as in Example 1 An eco-friendly mortar composition composition was prepared using an inflatable material.

(Comparative Example 1)

Based on 100 parts by weight of cement, it contains 13 parts by weight of fine zeolite powder, 1.5 parts by weight of a vinyl acetate-based polymer, 0.2 parts by weight of an expansion material, 1.5 parts by weight of a polycarboxylic acid-based high fluidizer, and 100 parts by weight of silica sand. was produced by mixing Portland cement in a weight ratio of 40 weight ratio, crude steel cement 35 weight ratio, and slag cement 30 weight ratio, and silica sand was prepared using fine sand having an average particle diameter of 0.3 to 1.5 mm to prepare a polymer mortar composition.

(Comparative Example 2)

Based on 100 parts by weight of cement, it contains 13 parts by weight of lyocell fiber, 1.5 parts by weight of a vinyl acetate-based polymer, 0.2 parts by weight of an expansion material, 1.5 parts by weight of a polycarboxylic acid-based high fluidizer, and 100 parts by weight of silica sand, and is formed by mixing additives, Cement was produced by mixing Portland cement in a weight ratio of 40 weight ratio, crude steel cement 35 weight ratio, and slag cement 30 weight ratio.

(Comparative Example 3)

Based on 100 parts by weight of cement, 4.5 parts by weight of a vinyl acetate-based polymer, 1.0 parts by weight of an expansion material, 1.5 parts by weight of a polycarbonate-based high fluidizing agent, and 100 parts by weight of silica sand, and additives are mixed to form the cement, but the cement is 40 parts by weight of Portland cement. , was produced by mixing crude steel cement at a weight ratio of 35 and slag cement at a weight ratio of 30, and silica sand was prepared by using fine sand having an average particle diameter of 0.3 to 1.5 mm to prepare a polymer mortar composition.

[Performance Evaluation]

(1) Physical properties of mortar composition

Test specimens were prepared using the mortar compositions prepared in Examples and Comparative Examples, and physical properties were measured by the following test method.

1) Setting time: KSF 2436

2) Flexural strength: KS F 2476 「Strength test method of polymer cement mortar」

3) Compressive strength: KSF 2405

4) Adhesive strength: KS F 4716 「Strength test method of polymer cement mortar」

5) Length change rate: It was measured according to KS F 2424 mortar and concrete length change test method. The value is set to 0 as the value of the initial construction body, “-” indicates the shrinkage rate, and “+” indicates the expansion rate.

6) Flow: It was carried out according to KS L 5220.

The results are shown in Table 1 below.

Item Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Condensation time (min) sequel 25 26 36 39 59 closing 32 31 55 60 110 flexural strength
(N/mm ² ) mourning 23 25 15 13 8 underwater 19 20 12 10 7 compressive strength
(N/mm ² ) mourning 78 78 54 49 42 underwater 72 75 49 42 37 Adhesive strength
(N/mm ² ) mourning 8.0 8.2 3.7 3.5 2.7 underwater 6.9 6.8 1.7 1.4 1.1 Length change rate (%) +0.006 +0.004 +0.05 +0.03 +0.10 flow (mm) 83 89 150 141 139

As shown in Table 1 above, in the case of the eco-friendly mortar composition composition according to the present invention, the physical properties are remarkably superior to that of the conventional mortar composition, and in particular, the flexural strength, compressive strength and adhesion strength in air and water are remarkably excellent as well as It can be seen that the length change rate also provides a remarkably relatively excellent performance.

(2) Durability performance evaluation

1) Weatherability evaluation

400 hours were measured according to ASTM G 155.

2) Surface hardness evaluation

Pencil hardness was measured according to KS D 6711.

3) Water resistance evaluation

The time for continuous surface deformation (cracks, blisters, etc.) to occur in hot water at 120°C was measured.

Table 2 shows the evaluation results.

Weather resistance (white) surface hardness water resistance Example 1 △E1.5 6H 920hr Example 2 △E1.7 5H 890hr Comparative Example 1 △E2.1 3H 510hr Comparative Example 2 △E3.3 3H 410hr Comparative Example 3 △E4.2 2H 320hr

From the results of Tables 1 and 2 above, when the eco-friendly mortar composition according to the present invention is used as a rear material for a bridge expansion joint device, the performance of the mortar is excellent, the adhesion to concrete is excellent, and the physical properties such as weather resistance and water resistance are also As it is excellent, it can be confirmed that the long-term durability of the bridge expansion joint device can be improved.

As described above, preferred embodiments of the present invention have been disclosed in the present specification and drawings, and although specific terms are used, these are only used in a general sense to easily explain the technical content of the present invention and to help the understanding of the present invention. , it is not intended to limit the scope of the present invention. It will be apparent to those of ordinary skill in the art to which the present invention pertains that other modifications based on the technical spirit of the present invention can be implemented in addition to the embodiments disclosed herein.

Claims (4)

100 parts by weight of fast-setting binder, 0.1 to 10 parts by weight of fiber, 0.1 to 5 parts by weight of fine zeolite powder, 0.1 to 5 parts by weight of polypropylene resin, 0.1 to 5 parts by weight of expansion material, 0.1 to 5 parts by weight of polycarboxylic acid-based high fluidizing agent It consists of parts by weight, including 30 to 150 parts by weight of silica sand,
0.1 to 5 parts by weight of a water-soluble modified latex, 0.1 to 2 parts by weight of an alkoxysilane hydrolyzate, 0.1 to 3 parts by weight of a silicone liquid component,
0.5 to 10 parts by weight of clinker, 1 to 10 parts by weight of a mixture of dihydrate gypsum and hemihydrate gypsum, 0.5 to 10 parts by weight of plaster, 0.5 to 10 parts by weight of anhydrite, 0.1 to 5 parts by weight of silica fume, 0.01 to 5 parts by weight of fly ash, It contains a powder component comprising 0.5 to 10 parts by weight of limestone and 0.01 to 5 parts by weight of slag,
As an eco-friendly mortar composition for a rear material for a bridge expansion joint device, comprising 0.1 to 2 parts by weight of an activation accelerator and 0.01 to 1 parts by weight of a lithium-based reaction accelerator,
The water-soluble modified latex contains 10-20 parts by weight of acrylic resin, 10-20 parts by weight of SBR (Styrene-Butadiene rubber) rubber, 0.1-5 parts by weight of hydroxyl acrylate monomer, 15-30 parts by weight of unsaturated polyester resin, 0.1-5 parts by weight of gallic acid Bridge, characterized in that it is comprised of parts by weight, metal cations 1-10 weight ratio, graphite solvent dispersion 0.1-2.0 parts by weight, aluminum chloride 0.1-1.0 parts by weight, dispersant 0.5-5 weight ratio, and water 40-70 weight ratio An eco-friendly mortar composition for use after expansion joints.
The bridge expansion joint according to claim 1, wherein the fast-setting binder is composed of a mixture of Portland cement in a weight ratio of 100 weight ratio and a mixture of calcium aluminate, calcium sulfoaluminate, magnesium aluminate and magnesium sulfoaluminate in a weight ratio of 20-50 An eco-friendly mortar composition for use after equipment.
delete The method according to claim 1, wherein the siliconate-based liquid component is potassium methylsiliconate 0.1 to 5 weight ratio, 3-iodo-2-propynyl-N-butyl carbamate 0.1 to 5 weight ratio, epoxy-based binder resin 0.1 to 10 weight ratio and An eco-friendly mortar composition for a rear material for a bridge expansion joint device, characterized in that it contains an inorganic polymer containing a fluorine (F) group in a ratio of 0.1 to 5 weight ratio.