KR100971111B1 - Superabsorbent concrete composite and concrete paving method using the same - Google Patents

Abstract

PURPOSE: A water-retaining concrete composition is provided to improve repair capability of the inner part of concrete using a composite having an ionic bond of functional powder and slag which is coated with a water-swelling polymer and to enhance the strength and durability of the concrete. CONSTITUTION: A water-retaining concrete composition includes 38-50 weight% of thick aggregates, 25-35% of fine aggregates, 12-32 weight% of a cement binding material, 1-10 weight% of a composite having an ionic bond of functional powder and slag which is coated with a water-swelling polymer, 0.01-0.5 weight% of antifoaming agent, 0.005-1 weight% of superplasticizer, and 0.1-5 weight% of an inorganic pigment.

Description

Water-soluble concrete composition and concrete paving method using the same {Superabsorbent concrete composite and concrete paving method using the same}

The present invention relates to a water-retaining concrete composition for use in civil engineering, and more particularly, to a water-retaining concrete composition for water-retaining packaging and a method of constructing a floor pavement using the same. Water-retaining concrete using composites consisting of ion-bonded slag coated with functional fine powders (hydrotalite, etc.) and water-swellable polymers of differentiating pore membrane structures, etc. It relates to a composition.

As the city grows rapidly, residential, commercial, and public facilities increase, reducing the area of green areas.In the urban sidewalks, driveways, parks, and parking lots, concrete pavement and asphalt pavement are used, so water including rainwater flows into drains early. It is discharged to the sewer and the water which accumulates on the pavement surface is evaporating early.

In addition, due to various kinds of artificial heat and air pollutants, the temperature above the city began to rise higher than the surrounding area. Due to this complex effect, when the temperature rises in the downtown area, the temperature of the pavement rises and the downtown temperature rises overall to improve the living environment. A worsening heat island phenomenon is occurring.

In order to reduce the heat island effect due to the artificial packaging, it is possible to supply water to the basement in a situation where there are insufficient concrete measures for the heat island phenomenon site and the development of packaging technology to alleviate the heat island phenomenon is insufficient. It has a small, active water retention function, and evaporates the repaired water as the temperature rises. The water retention effect can be suppressed by the heat of vaporization due to evaporation heat. Development of packaging materials is required.

In addition, the present invention is a pavement material having a function of suppressing the rise of the road surface temperature by the evaporation of water in the pavement evaporation, the heat evaporation of water, reducing the amount of heat storage in the pavement than the general pavement, pedestrians, space or city To provide a sustainable packaging material that can be expected to improve the heat aversion phenomenon of space and alleviate heat island phenomenon.

In addition, the present invention is to provide an environmentally friendly sustainable floor pavement that can be applied as part of the heat island phenomenon countermeasures, such as the walkway in the city, the walkway in the park, the bicycle road, the auxiliary road in the apartment complex.

The present invention has been made to solve the above problems, the slag coated with a hydrotalcite and the water-swellable polymer of the differentiating pore membrane structure is mixed with the composite consisting of ionic bonds to lower the water-cement ratio, water inside the concrete Water-retaining concrete composition which improves the repair ability to store the oil, improves workability by securing sufficient finishing work time, and improves the bending, tension, adhesion strength and durability of concrete. The purpose of this study is to propose a method for constructing a conservative floor paving material.

In addition, to increase the recycling rate of the slag, to achieve the recycling of resources, and to reduce the environmental burden on the landfill as a recycling method, the object of the present invention is to recycle the resources by recycling the pozzolanic materials can be used as construction civil engineering materials It is to provide a method for recycling pozzolanic materials that can solve environmental problems such as landfills and landfills and contribute to environmental conservation.

In addition, by recycling the pozzolanic ash, a by-product of the thermal power plant, it is possible to increase productivity and create added value from recycling.

The present invention is to solve the above problems, coarse aggregate 38-50% by weight, fine aggregate 25-35% by weight, cement binder 12-32% by weight, coated with water-swellable polymer of the functional fine powder and differentiating pore membrane structure It provides a water-retaining concrete composition comprising 1 to 10% by weight of the composite of the slag ionic bond, 0.01 to 0.5% by weight of the defoaming agent, 0.005 to 1% by weight of the high fluidizing agent and 0.1 to 5% by weight of the inorganic pigment.

In addition, the present invention relates to a water-retaining concrete pavement method using a water-retaining concrete composition, comprising: laying the water-retaining concrete composition on an upper side of the ground; and spraying a release agent on the unreinforced water-retaining concrete after finishing the plastering work. Step; and forming a pattern on the upper surface of the water-retaining concrete composition using a molding mat; and curing the water-retaining cement concrete composition; And removing the forming mat and coating it with a surface protector.

According to the repair concrete composition using a composite comprising a functional fine powder (hydrotalite, etc.) according to the present invention and a slag coated with a water-swellable polymer having a differentiation-forming pore membrane structure composed of ionic bonds, the functional fine powder (hydrotalite, etc.) The slag coated with water swellable polymer of differentiation composition pore membrane structure is composed of ion-bonded composites, which improves the water-reserving ability to store water in the concrete, and improves the workability of concrete and the improvement of strength and durability. It can exhibit the improvement without degrading warpage, tensile strength, and adhesive strength.

In addition, the release of water from the floor pavement according to the present invention is gradually released, the surface temperature of the concrete pavement is about 5 ~ 15 ℃ lower than the existing pavement to significantly reduce the heat island (heat island) phenomenon and persistence of the heat island reduction effect phenomenon Can be increased.

In addition, the slag coated with functional fine powder (such as hydrotalcite) and the water-swellable polymer of the differentiating pore membrane structure effectively reduces the W / C ratio even if a small amount of the composite composed of ionic bonds is used, which is much higher than that of the existing concrete composition. It can exhibit strength development and durability improvement.

In addition, by using the slag which is a by-product of the thermal power plant as the raw material of the concrete, it is possible to recycle resources and provide a recycling method that can contribute to environmental protection. Conventionally, the slag is used as a substitute for aggregate that can be simply processed in large quantities, but the present invention invented a manufacturing method that can be used as a raw material for high-strength concrete products while having permeability and breathability based on the physical and chemical properties of the slag. . In particular, by reducing the amount of cement used, it is possible to reduce raw material costs when producing concrete products.

Hereinafter, preferred embodiments of the present invention will be described in detail. Prior to this, terms or words used in this specification and claims should not be construed in a common or dictionary sense, and the inventors will be required to properly define the concepts of terms in order to best describe their invention. Based on the principle that it can, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Therefore, the configuration described in the embodiments described herein is only one of the most preferred embodiments of the present invention, and does not represent all of the technical idea of the present invention, various equivalents and modifications that can replace them at the time of the present application, It should be understood that there may be examples.

The present invention relates to a water-retaining concrete composition for use in civil engineering, and more particularly, to a water-retaining concrete composition for water-retaining packaging and a method of constructing a floor pavement using the same. Water-retaining concrete using composites consisting of ion-bonded slag coated with functional fine powders (hydrotalite, etc.) and water-swellable polymers of differentiating pore membrane structures, etc. It relates to a composition.

In the present invention, the composite particles and blast furnace slag made of ion-bonded slag coated with functional fine powder (hydrotalite, etc.) and superabsorbent polymer of differentiating pore membrane structure constitute a concrete raw material and high-strength concrete The mechanism formed is as follows.

Coated slag coated with small functional fine powder (such as hydrotalcite) and superabsorbent polymer of differentiating pore membrane structure and blast furnace slag particles are attached around aggregate particles. Slag coated with functional fine powder (such as hydrotalcite) and superabsorbent polymer of differentiating pore membrane structure is composed of ionic bonds, blast furnace slag performs concrete hydration and pozzolanic reaction, and concrete produced hydrate Crosslinking is formed between them.

Therefore, the granules are irregular in shape and contain a lot of pores, so they have a high absorption rate, but they are coated with such irregular granular and functional fine powders (hydrotalites, etc.) and superabsorbent polymers with differentiating pore membrane structure. The composite composed of slag with ionic bonds does not have a negative effect of weakening strength and can express higher strength properties because the CSH hydrate (calcium silicate hydrate) particles are uniform through the hydration reaction of aggregate and binder cement. After growth, CSH hydrate (calcium silicate hydrate) in the form of wheat-filled was produced, and the slag coated with functional fine powder (such as hydrotalcite) and superabsorbent polymer of differentiating pore membrane structure was formed by ion bonding. This is because a solid crosslink is formed at the outer surface of the composite particle.

Here, composite particles and slag cement powders composed of ion-bonded slag coated with functional fine powder (such as hydrotalcite) and superabsorbent polymer of differentiating pore membrane structure mainly perform concrete hydration and pozzolanic reaction. do.

In order to improve the long-term strength of concrete, functional fine powders (such as hydrotalcite) in which 70-81% of SiO ₂ + Al ₂ O _{3, which} is the basic material of pozzolanic reaction, and water-swellable polymers of differentiating pore membrane structure Slag coated with polymer) is used as a composite consisting of ionic bonds, and blast furnace slag cement having a CaO content of 51.6% is mixed in an appropriate ratio. The addition of the CaO component here is essential for the generation of slaked lime (Ca (OH) ₂ ) required for the pozzolanic reaction.

When the blast furnace slag is replaced by about 10% of the amount of cement binder used, Ca (OH) ₂ and SiO ₂ and Al ₂ O ₃ in the hydration of concrete react for a long time, CSH (calcium silicate hydrate) Or create a CAH. As a result, various advantages such as improvement of long-term strength, reduction of initial heat of hydration, cost reduction, and environmental preservation by recycling waste (pozzolanic material) are obtained. However, the initial strength of concrete is deteriorated.

Therefore, since slag contains appropriate amounts of reactive components such as SiO ₂ and Al ₂ O ₃ , small particles of slag are used to facilitate the pozzolanic reaction, and blast furnace slag containing about 50% of CaO is mixed at an optimum ratio. When CaO reacts with water, Ca (OH) ₂ is generated and Ca (OH) ₂ causes SiO ₂ and Al ₂ O ₃ to cause pozzolanic reactions to form CSH and CAH, which are concrete hydrates. have.

Hereinafter, the above description will be described in detail.

Water-retaining concrete composition according to a preferred embodiment of the present invention, the coarse aggregate 38-50% by weight, fine aggregate 25-35% by weight, cement binder 12-32% by weight of the functional fine powder and the differentiating pore membrane structure The slag coated with the water swellable polymer comprises 1 to 10% by weight of the composite consisting of ionic bonds, 0.01 to 0.5% by weight of the antifoaming agent, 0.005 to 1% by weight of the high fluidizing agent and 0.1 to 5% by weight of the inorganic pigment.

The concrete composition is to maximize the water swellability and the composition has excellent water retention (保 水性) compared to the conventional concrete composition.

In this case, the cement binder may comprise 10 to 20 parts by weight of Portland cement, 1 to 5 parts by weight of calcium sulfoaluminate (CSA) cement, and 1 to 7 parts by weight of blast furnace slag.

In addition, the cement binder may be generally composed of one or more of cement of Portland cement, calcium sulfoaluminate (CSA) cement, blast furnace slag cement and calcium alumina (CAC) cement.

In addition, the ordinary portland cement may comprise one or more of cement of white Portland cement, medium heat Portland cement and crude steel Portland cement.

The cement binder is a binder of the repair concrete composition and usually includes portland cement, calcium sulfoaluminate (CSA) cement or blast furnace slag. The cement binder can be used according to the required strength in the range of 40-80 parts by weight relative to 100 parts by weight of the binder, the portland cement is usually 30-80% by weight based on 100% by weight of the cement binder, calcium sulfoaluminate system ( It is preferable to apply the mixture in the range of 5-30% by weight of the CSA) cement, 5-30% by weight of the blast furnace slag.

Here, it is preferable to use the portland cement prescribed | regulated to KS as said normal portland cement. High strength water-retaining concrete can be obtained by using any cement such as medium heat portant cement or crude steel portland cement.

In addition, the calcium sulfoaluminate (Calciumsulfoaluminate; CSA) cement is used to prevent initial shrinkage and shrinkage, and consequently maintains water tightness by speeding up the progress of subsequent processes after construction and minimizing the influence of vibration of the surrounding environment. Used to prevent cracking of concrete and shrinkage of water-retaining concrete. In addition, calcium sulfo aluminate-based (CSA) cement can also improve the expansion performance of the water-retaining concrete composition because it also exhibits expandability. Calcium alumina (CAC) cement may be used instead of the calcium sulfoaluminate (CSA) cement.

Increasing the weight ratio of calcium sulfoaluminate (CSA) shows fast curing characteristics. If the content is less than 5% by weight with respect to 100% by weight of cement binder, the water-retaining concrete strength and cracking inhibiting effect are weak and may exceed 30% by weight. In this case, good physical properties can be obtained due to fast curing characteristics.

In addition, the blast furnace slag powder used in the present invention is an inert inorganic fine powder with a CaO content as a role of improving the workability and densifying the tissue with a high powder degree, with a powder level of 5,000 cm 2 / g or more based on a blain, Although it has the characteristics of, it is effective in reducing the heat of hydration because it does not generate the heat of hydration, and also has the effect of initial crack prevention because it ensures sufficient plastering time in the summer by delaying the setting time.

In addition, the blast furnace slag powder has the effect of reducing the amount of cracks generated during condensation by improving the amount of flat plastering workability by the ball bearing effect, and increasing the long-term durability and chemical resistance. The blast furnace slag fine powder may further include 5-30% by weight based on 100% by weight of the cement binder. The role of the blast furnace slag powder is to increase the sealability through the high powder level, thereby improving water-retaining concrete from external deterioration factors such as acid or carbon dioxide. It protects and improves chemical resistance and neutral chemical resistance.

When the blast furnace slag powder is less than 5% by weight, the above-mentioned performance expression, which is a characteristic of the cement binder, is remarkably lowered, and there is no significant effect on improving the durability of the hardened body, and the initial strength when the blast furnace slag powder exceeds 30% by weight. Although there is a disadvantage in that drying shrinkage occurs due to deterioration and increase in the use of water with a high powder density, it may adversely affect workability by reducing initial compressive strength or decreasing flowability, but long-term strength expression and flame resistance are increased. .

In the present invention, not only the blast furnace slag fine powder but also the blast furnace slag cement can secure long-term resistance to thermal factors using reactive latent hydrophobicity and pozzolanic reaction. In addition, silica powder, silica fume and fly ash may be used instead of the blast furnace slag.

The composite of the functional fine powder (hydrotalite, etc.) and the slag coated with the water-swellable polymer of the differentiation-forming pore membrane structure is made of ionic bonds. It is designed to complement.

In other words, when slag is simply used as a substitute for aggregate in the conventional concrete composition, the strength of concrete was weakened. This is because the surface of the particles of slag is irregular and porous, so that the absorption rate is about 6 to 8% higher than that of general aggregate. It was because the durability was weak due to the repeated action of cracking, dry and wet and freeze-thawing in dry shrinkage. In addition, since the slag pH generally has an alkalinity of 9.0 to 9.5, an alkali aggregate reaction with the siliceous mineral in the aggregate may occur, causing cracks in the concrete. In addition, the irregular slag surface has a disadvantage in that workability is degraded when using concrete in a field requiring watertightness. Alkali Aggregate Reaction refers to an silica gel (SiO ₂ ) contained in the aggregate by alkali (NaOH, KOH) supplied from cement, an inorganic binder, to form an expandable gel, which is a jelly material. It is known that cracking occurs as the gel expands and absorbs, and this is known to be mainly caused by alkali silica reaction.

Therefore, in the present invention, when using slag as a raw material of the concrete composition, a method of expressing strength by reaction of small aggregate particles, a method of preventing weakening of strength due to high absorption rate, and a non-reactive aggregate that can avoid an alkali aggregate reaction. In this method, a composite consisting of ionic bonds of slag coated with a functional fine powder (such as hydrotalcite) and a water-swellable polymer having a differentiating pore membrane structure is formed. To allow the slag to be recycled into the floor concrete pavement.

That is, a composite made of functional fine powder (such as hydrotalcite) and slag coated with a water swellable polymer of a differentiation-porous membrane structure is made of ionic bonds by a method of making ionic bonds as polar bonds. Specifically, the contents of the composite having the water swelling properties are fixed to the slag and the functional powder (hydrotalite, etc.) to adhere the charge-charged material and the water-swellable polymer coating particles of the differentiation-porous membrane structure on the slag To prepare. Characterized by the differentiating pore membrane structure coating particles made of the water-swellable polymer, the pores of the surface portion of the outer portion of the coating forms a collapsed differentiating pore membrane structure. In addition, the material charged on the slag is fixed to form a functional fine powder (hydrotalsite, etc.) containing the opposite charged material. Here, the function of the functional fine powder (hydrotalsite, etc.) induces an anion exchange reaction. In other words, Cl ^- ions in concrete are exchanged with negatively charged complex ions in functional fine powders (hydrotalite, etc.). Among the properties for the anion exchange reaction, ion selectivity is generally functional fine powders (hydrotalite, etc.). If the sizes are similar, the divalent anions have high selectivity.

By the above technical configuration, the water swellable polymer collects the water in the unconsolidated concrete to reduce the water cement ratio in the concrete, and the concrete has low water cement ratio around the pores due to the pore formation, resulting in improved strength than the compounding strength. In addition to the rapid hydration of the cement, calcium hydroxide from the pozzolanic reaction is almost consumed, and the initial strength reduction of concrete is overcome by incorporating the new material of the composite aggregate particle combined with the fine powder and the swellable porous coating fine aggregate according to the present invention. At the same time, high-strength conservative concrete can be realized.

In general, when the superabsorbent polymer is used as the admixture when producing the water-retaining concrete, the hydration reaction is delayed and the initial strength is lowered, and the compressive strength is lowered than before use. In addition, if the polymer is used directly, the polymer may float to the surface due to the bleeding phenomenon or the powder bleeding phenomenon may cause difficulty in obtaining a uniform result of the superabsorbent polymer distribution due to the powder bleeding phenomenon. Will occur.

Therefore, in the present invention, a composite made of ion-bonded slag coated with a functional fine powder (such as hydrotalcite) and a water-swellable polymer of a differentiating pore membrane structure used as a water-retaining concrete composition is a water-swellable polymer that absorbs the water. Reduction of pore volume and water content due to hydration of cement as it is deposited on the surface of aggregate and cement gel or unhydrated cement particle mixture in the form of a film from slag to porous coating and then partially dissolved or shape traced swelling during water-concrete mixing. As the capillary water decreases due to evaporation, the capillary pores are agglomerated to form a network structure of the finally continuous absorbent polymer film.

However, the absorbent polymer aqueous solution is subjected to repeated repeated absorption which returns to the water swelling state again after contact with moisture even after releasing moisture through curing process after gelling. Moisture absorption of composites consisting of ion-bonded slag coated with functional fine powder (hydrotalite, etc.) and water swellable polymers of differentiating pore membrane structures should be able to be absorbed evenly throughout the composite. The behavior of water swellable polymers affects the properties of concrete. In the unsolidified state, water soluble polymers disperse due to hydrophilic colloidal properties such as workability, air embrittlement, resistance to bleeding or material separation, and water retention. After curing, the cement hydrate and the polymer coating matrix phase are integrated with each other to improve water retention, chemical resistance, freeze-melting resistance, and mechanical properties such as tensile strength, bending strength, elongation ability, and wear resistance. Therefore, by mixing an appropriate amount of the composite of the functional fine powder (hydrotalite, etc.) and the water-swellable polymer of the differentiation constituent pore membrane structure consisting of ionic bonds, the compounded W / C (water / cement) ratio is effectively reduced. It can exhibit much higher strength and durability than conventional water-retaining concrete compositions.

In the present invention, the water-swellable polymer (superabsorbent polymer) for the porous coating of the slag, may be selected from any one or more of polyvinyl alcohol, polyvinylpyrrolidone and polyethylenimine. Exemplary water swellable polymers used in this example are selected from polyvinyl alcohol (PVA).

The water swellable polymer may be used as long as the molecular weight is 25,000 to 100,000 and the degree of polymerization is 500 to 2,000 or more. Since the solvent used for the water swellable polymer should be removed by extraction or evaporation, generally a low boiling point solvent such as methanol or ethanol or acetone is preferred. Here, the organic solvent used to dissolve the water-expandable polymer is ethylene glycol, trimethylene glycol, diethylene glycol and glycerin, dimethylformamide, diethylenetriamine, methanol, ethanol, methylene chloride, chloroform, acetone, 5 -Fluorouracil, DMSO, water and thioisocyanate and mixtures thereof, and the like. The water swellable polymer is used at 1 to 20% by weight based on 100 parts by weight of the dispersion medium. If the amount is less than 1% by weight, the thickness of the coated particles decreases, and if the amount exceeds 20% by weight, the uniformity of the particles may decrease and aggregation of the coated particles may occur. Thereby, 0.1 to 15% by weight of the dried water swellable polymer is complexed to the aggregate based on the weight of the dried aggregate. Preferably 0.1-10 weight%, More preferably, 1-10 weight% forms a water swellable polymer complex in aggregate.

In an embodiment of the present invention, to form a porous coating matrix made of a water-swellable polymer having a core, the dispersion medium may be ethanol or DMSO. The amount of DMSO as the first organic solvent is 10 to 100% by weight based on the amount of water as the second solvent, and if the conversion standard is different, 2 to 20% by weight of the first organic solvent is used based on 100% by weight of water as the second solvent. Preference is given to using.

In the present invention, firstly, a vertically circulating flow generation type stirring dissolving tank prepared by dissolving a water swellable polymer in DMSO, which is a first solvent, and then adding a predetermined amount of the dissolved water swellable polymer solution to a water dispersion medium, which is a second solvent. Distilled water was added to the water swellable polymer solution dissolved in the first organic solvent therein, and the stirring was started when the water swellable polymer temperature reached 45-70 ° C. Moreover, pressurizing the inside of a dissolution tank is also preferable at the point which can perform uniform dissolution, and it continues to melt | dissolve 0.5-3 hours stirring. After dissolution, desired concentration adjustment is performed to provide a water swellable polymer.

Alternatively, a water swellable polymer is provided that can be evenly distributed on the coating surface with a uniform porous coating thickness and cores with collapsed pore matrix properties. In the present invention, it is possible to form pores of the water swellable polymer after the crosslinking is formed using a freeze-thawing method that causes the physical cross-link formation of the water swellable polymer, and the pores of the water swellable polymer may have different porosities and different physical properties.

In addition, the functional fine powder used in the present invention is ganbanite, silicon carbide, hydrotalite, hydroapatite, apatite carbonate, calcium monophosphate, calcium triphosphate, activated carbon, activated alumina, zeolite, illite, carbon, silica, Silicon, red mud, loess, zirconia, talc, calcium carbonate, mica, dolomite, kaolin, silica fume, aluminum trioxide, gypsum, magnesium, metal silver compounds, titanium dioxide, marble, and limestone can do. As a method of obtaining a hydrotalcite-based compound from natural or synthesized hydrotalcite, a durable ionic compound may be dispersed in water or other organic solution and deposited by electrolysis. The hydrotalcite particles in the micrometer range do not exceed the range of 0.5 μm to 5 μm. There is also no limit to the selection from the functional fine powders listed above.

The antifoaming agent is added to remove the large pores due to the generation of entrained air in the concrete to reduce the increase in the amount of air, and is used to improve the strength and appearance of the concrete. The antifoaming agent is preferably added 0.01-1% by weight relative to 100% by weight of the concrete composition. If the amount of the antifoaming agent used is less than 0.01% by weight, a sufficient foam suppression effect cannot be obtained, and when it is used in excess of 1.0% by weight, it is not economical.

Examples of the antifoaming agent include mineral oil-based antifoaming agents such as kerosene and paraffin, animal and vegetable oils, sesame oil, castor oil and oil-based antifoaming agents such as alkylene oxide adducts thereof, olein, stearic acid and alkylene oxide adducts thereof, and the like. Fatty acid ester antifoaming agents such as antifoaming agent, glycerin monolicinolate, alkenyl amber acid fluid, sorbitol monolaurate, sorbitol trioleate, natural wax, etc., polyoxyalkylenes, (poly) oxyalkyl ethers, acetylene ethers, Oxyalkylene antifoaming agents such as (poly) oxyalkylene alkyl phosphate esters, (poly) oxyalkylene alkylamines, (poly) oxyalkyleneamides, alcohols such as octyl alcohol, hexadecyl alcohol, acetylene alcohol, glycols, etc. Amide-based antifoaming agents such as antifoaming agents, acrylate polyamines, phosphoric acid such as tributyl phosphate, sodium octylphosphate, and the like. Thermal-based anti-foaming agents, aluminum stearate, calcium oleate (polyorganosiloxanes such as dimethyl polysiloxane), metal soap-based defoaming agent, dimethyl silicone oil, silicone, pay seut, silicone emulsions, organic modified polysiloxanes such as. Any one or more selected from the group consisting of silicone-based antifoaming agents, such as fluorosilicone oil, may be used, but is not limited thereto, and types commonly used in the art may be used.

In the present invention, nonionic surfactants and the like can be generally used as an oily substance having a low volatility and a high diffusivity. In addition, a commercially available silicone antifoaming agent can be used as the silicone antifoaming agent having excellent chemical stability. Preferably the antifoaming agent was used German BASF Lumiten L-10.

In the present invention, the high fluidizing agent is a compound that exerts an effect of increasing the slump in the same unit amount, and serves as a surfactant.

It is preferable that the high fluidizing agent used in the present invention is melamine or carboxyl. The high fluidizing agent is adsorbed on the surface of the cement particles to give charge to the surface of the particles to cause mutual repulsion between the particles, the dispersion of the aggregated particles to increase the flow of cement particles due to the water-cement ratio of the composition of the present invention Improves strength and improves durability.

In particular, the amount of water used was reduced by 10-25% or more compared to the conventional formulation by using a carboxyl-type fluidizing agent, which is a high fluidizing agent. By reducing the amount of water used, the number of capillaries, which are the movement paths of the water, can be reduced, thereby making concrete structures more compact, and this compact structure greatly helps to suppress the penetration of water from the surface.

The high fluidizing agent used in the present invention is a carboxylates fluidizing agent, a polycarboxylic acid high fluidizing agent, or a melamine high fluidizing agent, which brings about a water use reduction effect of about 10 to 25% by weight. The reduced water consumption of 10 to 25% by weight reduces the capillary water in the water-retaining concrete during the production of the water-retaining concrete, resulting in a more compact structure. The amount of the carboxyl-based high fluidizing agent is preferably configured to further comprise 0.005 to 1% by weight based on the content of the concrete composition, if less than 0.005% by weight, the fluidity is lowered, the performance expression If it is not made and exceeds 1% by weight, the mortar viscosity is reduced due to excessive use, and the aggregate separation phenomenon occurs in which the material is separated.

As examples of the fluidizing agent of the water-retaining concrete composition according to the present invention, it is preferable to use a carboxyl-type high-melting agent or a melamine-type high-oiling agent. Therefore, the amount of the above-mentioned high-concentration agent is 0.005 to about 100% by weight of the total water-retaining concrete composition. It may contain 1% by weight. In the embodiment of the present invention was used Melment F-10, Degussa.

The inorganic pigment may use any one or more of red iron oxide, yellow iron oxide, chromium oxide (CrO 3), titanium dioxide, and carbon black, thereby realizing various colors such as red, green, yellow, black, blue, and white. . Herein, the amount of the inorganic pigment according to the present invention is preferably used in the aspect of stably expressing a desired color when it contains 0.1 to 5 wt% of the inorganic pigment with respect to 100 wt% of the water-retaining concrete composition.

In addition, the present invention relates to a water-retaining concrete pavement method using a water-retaining concrete composition according to the present invention, the step of laying the water-retaining concrete composition on the upper side of the ground; Spraying a release agent on the water-retaining concrete; and forming a pattern using a forming mat on the upper surface of the water-retaining concrete composition; and curing the water-retaining cement concrete composition; And removing the forming mat and coating it with a surface protective agent.

Since the paving method according to the present invention is the same as the usual paving method except that water-retaining concrete composition is used as the concrete composition, detailed description thereof will be omitted.

Hereinafter, embodiments of the water-retaining concrete composition according to the present invention as described above will be presented in more detail, and the present invention is not limited by the embodiments presented below.

Tensile strength, flexural strength, chemical resistance, neutralization resistance, and the like of the water-retaining concrete composition according to the present invention were tested in the following [Table 1], and the performance was demonstrated through the surface temperature test in the [Table 2]. The results are shown below.

(1) compressive strength test

Normally, the portland cement mortar and the mortar according to the embodiment of the present invention are used to produce a 5 cm cube specimen, and after 1 day of demolition and curing in air, the compressive strength test for ages 3, 7, and 28 days is conducted according to KS L 5105. Was carried out.

(2) Tensile strength test

Tensile strength test of mortar was tested for tensile strength in accordance with JIS A 1113 (test method), the test speed was 1mm / min.

(3) Flexural strength test

Flexural strength test is to be carried out in accordance with KS F 2477 (Test method for strength of polymer cement mortar) and KS F 2407 (Test method for concrete bending strength, Center point load method of simple beam). The load speed was performed by applying 1 mm / min.

(4) chemical resistance test

In this experiment, the acid resistance was tested by immersion in a magnesium sulfate 3% aqueous solution for 72 hours according to ASTMC 267-92, and tested for flame resistance by immersing in a 5% calcium chloride aqueous solution for 72 hours to observe the appearance.

(5) Freeze thaw resistance test

Freeze thaw refers to the freezing and melting of the moisture absorbed by the concrete, and when the freeze thaw is repeated, fine cracks are generated in the concrete structure, resulting in a problem of deterioration in durability.

The degree of internal defects was measured by repeating freezing and thawing with a certain temperature difference and a certain period using a freezing melting tester with reference to KS F 2456. The experimental environment was to repeat the temperature change of the maximum -4 ℃ to the minimum -18 ℃, and the relative inelastic modulus (%) was measured by the ultrasonic speed meter for the degree of defect generation in the specimen.

(6) Neutralization Resistance Test

Recently, as the concentration of carbon dioxide in the urban atmosphere is greatly increased, durability is deteriorated due to the neutralization of concrete. In the present invention, in order to evaluate the concrete neutralization phenomenon, which is a long-term chemical reaction of carbon dioxide and cement hydrate in the air in a relatively short time, at 14 days of age, an artificially accelerated environment with a carbon dioxide concentration of 5%, a temperature of 23 ° C, and a humidity of 80% Neutralization resistance was evaluated. The neutralization resistance is represented by the neutralization penetration depth (mm), and has a value of about 14 mm in the case of the conventional concrete composition.

(7) Surface temperature test

In order to find out the heat island effect (Heat island) of the present invention was tested as follows. The test package was cured at the same compounding ratio as in Example 1 with a size of 60 × 60 × 10 cm, and the specimens were cured in air for 1 day and then cured in 20 ± 2 ° C. for 7 days. Using this device, an infrared lamp was installed 40cm above the surface of the specimen, and when the temperature was 33 ℃ in summer, the surface temperature of the concrete pavement was investigated. The temperature sensor was installed at the top to measure the surface temperature.

In the following test examples, the slag coated with the water swellable polymer of the hydrotalcite and the differentiating pore membrane structure in Examples 1 to 6 can be more easily understood by the characteristics according to the present invention. It shows to the chamber during the test results of comparing the characteristics with the examples and comparative examples according to the invention compared to the application to discriminate the fine aggregate particle diameter of 2 ~ 5mm for yirwojin complex.

 ≪ Example 1 >

320 kgs of common portland cement, 43 kgs of CSA cement, were mixed and further mixed with 40 kgs of blast furnace slag powder. To the mixture is coated with a slag hydrotalcite site and differentiation organizer membrane structure of the water-swellable polymer mixture of 98kgs complexes, inorganic pigments 30kgs yirwojin by ionic bonding, which was the key to the lock uniform blend Mixing. Next, after mixing 650kgs of fine aggregate with particle diameter of 2 ~ 5mm, 925kgs of coarse aggregate with particle diameter of 13 ~ 25mm, mix 140kgs of water, 1.5kgs of polyfoam based antifoaming agent, and 2.5kgs of polycarboxylic acid-based high softening agent. After stirring in a forced mixer, and evenly poured to prepare a concrete composition for repair.

<Example 2>

320 kgs of common portland cement, 43 kgs of CSA cement, were mixed and further mixed with 40 kgs of blast furnace slag powder. To the mixture is coated with a slag hydrotalcite site and differentiation organizer membrane structure of the water-swellable polymer mixture of 111kgs complexes, inorganic pigments 30kgs yirwojin by ionic bonding, which was the key to the lock uniform blend Mixing. Next, after mixing 637kgs of fine aggregate with particle size of 2 ~ 5mm, 925kgs of coarse aggregate with particle diameter of 13 ~ 25mm, mix 140kgs of water, 1.5kgs of polyfoam based antifoaming agent, and 2.5kgs of polycarboxylic acid high softening agent. After stirring in a forced mixer, and evenly poured to prepare a concrete composition for repair.

<Example 3>

320 kgs of common portland cement, 43 kgs of CSA cement, were mixed and further mixed with 40 kgs of blast furnace slag powder. To the mixture is coated with a slag hydrotalcite site and differentiation organizer membrane structure of the water-swellable polymer mixture of 126kgs complexes, inorganic pigments 30kgs yirwojin by ionic bonding, which was the key to the lock uniform blend Mixing. Next, after mixing 623kgs of fine aggregate with particle diameter of 2 ~ 5mm, 925kgs of coarse aggregate with particle diameter of 13 ~ 25mm, mixed 140kgs of water, 1.5kgs of polyfoam based antifoaming agent, and 2.5kgs of polycarboxylic acid high softening agent. After stirring in a forced mixer, and evenly poured to prepare a concrete composition for repair.

<Example 4>

320 kgs of common portland cement, 43 kgs of CSA cement, were mixed and further mixed with 40 kgs of blast furnace slag powder. The slag coated with the hydrotalcite and the water- swellable polymer of the differentiation-forming pore membrane structure was mixed with 140 kgs of ionic bonds and 30 kgs of inorganic pigments, followed by a dry beam . Next, after mixing 608kgs of fine aggregate with particle diameter of 2 ~ 5mm, 925kgs of coarse aggregate with particle diameter of 13 ~ 25mm, mixing water 140kgs, silicone antifoaming agent Lumiten L-10 (BASF) 1.5kgs and melamine high-moisturizing agent Melment F-10 (Degussa) 2.5 kgs were further mixed and stirred in a forced mixer, and then uniformly poured to prepare a concrete composition for repair.

<Example 5>

320 kgs of common portland cement, 43 kgs of CSA cement, were mixed and further mixed with 40 kgs of blast furnace slag powder. Slag coated with a hydrotalcite and a water- swellable polymer having a differentiation-forming pore membrane structure was mixed with 155 kgs of an ion-bonded composite and 30 kgs of an inorganic pigment, and a dry beam was added to the mixture. Next, after mixing 593kgs of fine aggregates of 2 ~ 5mm in particle size and 925kgs of coarse aggregates of 13 ~ 25mm in particle size, 140kgs of compounding water, 1.5kgs of silicone antifoaming agent, and 1.5kgs of melamine-based high softening agent Melment F-10 (Degussa) 2.5 kgs were further mixed and stirred in a forced mixer, and then uniformly poured to prepare a concrete composition for repair.

<Example 6>

320 kgs of common portland cement, 43 kgs of CSA cement, were mixed and further mixed with 40 kgs of blast furnace slag powder. The slag coated with the hydrotalcite and the water- swellable polymer of the differentiating pore membrane structure was mixed with 168kgs of the ionic bond and 30kgs of the inorganic pigment, and mixed with the gun to make it uniformly mixed. Next, after mixing 580kgs of fine aggregate with particle diameter of 2 ~ 5mm, 925kgs of coarse aggregate with particle diameter of 13 ~ 25mm, mixing water 140kgs, silicone antifoaming agent Lumiten L-10 (BASF) 1.5kgs and melamine high-moisturizing agent Melment F-10 (Degussa) 2.5 kgs were further mixed and stirred in a forced mixer, and then uniformly poured to prepare a concrete composition for repair.

Comparative Example

320 kgs of ordinary portland cement, 43 kgs of CSA cement, were mixed and further mixed with 40 kgs of blast furnace slag powder. Slag 98 kgs , inorganic pigments 30 kgs was mixed with the mixture, and a gunbi beam was uniformly mixed. Next, after mixing 650kgs of fine aggregate with particle diameter of 2 ~ 5mm, 925kgs of coarse aggregate with particle diameter of 13 ~ 25mm, mixing water 140kgs, silicone antifoaming agent Lumiten L-10 (BASF) 1.5kgs and melamine high-melting agent Melment F-10 (Degussa) 2.5 kgs were further mixed and stirred in a forced mixer, and then uniformly poured to prepare a concrete composition for repair.

Table 1 below shows various experimental results, and Table 2 shows surface temperature measurement test results (measurement maximum atmospheric temperature of 29.7 ° C.) of the concrete composition for repair.

[Figure 1], which is shown below, was the calculation standard of [Table 2], and shows the measurement result of the surface temperature of the concrete composition for repair according to elapsed time, and [Figure 2] is described in [Table 1] The average tensile strength test results are compared with each other. [Figure 3] is a comparison of the average compressive strength test results described in [Table 1], and [Figure 4] is the average bending strength test results described in [Table 1]. Are shown in comparison with each other.

[Figure 1]

[Figure 2]

[Figure 3]

[Figure 4]

As shown in [Figure 1] and [Table 2], <Example 1> to <Example 6> using the water-retaining concrete composition according to the present invention, the surface temperature of the specimen is about 3 to 7 ℃ than the <Comparative Example> Therefore, when using the water-retaining concrete composition according to the present invention, it can be seen that the temperature increase effect of the concrete pavement surface can be reduced because the temperature of the concrete pavement surface is suppressed while moisture contained in the concrete composition is evaporated.

In addition to the temperature reduction effect, as shown in [Table 1], [Figure 2] to [Figure 4], the compressive strength and tensile strength of the specimen prepared by the method of <Example 1> to <Example 6> Both the strength and the flexural strength were similar or better than the <Comparative Example>, it can be seen that the concrete composition according to the present invention is also effective in the strength development.

In addition, in the various items shown in [Table 1], the specimens of <Example 1> to <Example 6> did not find any problems.

Therefore, when the concrete pavement using the water-retaining concrete composition according to the present invention can be expected as an additional effect to prevent the heat island phenomenon as well as the effect of increasing the strength.

As mentioned above, although this invention was demonstrated by the limited embodiment, this invention is not limited by this and it will be described below by the person of ordinary skill in the art, and the following. Of course, various modifications and variations are possible within the scope of the claims.

Claims (11)

38 ~ 50% by weight of coarse aggregate, 25 ~ 35% by weight of fine aggregate, 12 ~ 32% by weight of cement binder, 1 ~ 10% by weight of composite with functional fine powder and water-swellable polymer of differentiating pore membrane structure %, Antifoaming agent 0.01-0.5% by weight, high fluidizing agent 0.005-1% by weight and inorganic pigment 0.1-5% by weight,
The cement binder, usually 10 to 20 parts by weight of Portland cement, 1 to 5 parts by weight of calcium sulfoaluminate (CSA) cement and 1 to 7 parts by weight of blast furnace slag, water-retaining concrete composition, characterized in that. delete delete The method of claim 1, wherein the ordinary portland cement,
A water-retaining concrete composition, characterized in that it comprises a cement of any one or more of white portland cement, medium heat portland cement and crude steel portland cement. The method of claim 1, wherein the water swellable polymer,
Water-soluble concrete composition, characterized in that any one of polyvinyl alcohol, polyvinylpyrrolidone and polyethylenimine. The method of claim 1, wherein the functional fine powder,
In any one of a hydrotalcite compound (Hydrotalcite), a hydroapatite compound (Hydroxyapatitie), calcium monophosphate (CaHPO ₄ ) and calcium triphosphate (TriCalcium Phosphate, TCP),
A water-retaining concrete composition comprising any one of titanium, activated alumina, zeolite, elite, red mud, loess, carbon and silica fume. The antifoaming agent of claim 1,
A water-retaining concrete composition, characterized by being a silicone antifoaming agent. The method of claim 1, wherein the high fluidizing agent,
A water-retaining concrete composition, characterized in that any one of a polycarbon-based high fluidizing agent, a carboxyl-based high softening agent and a melamine-based high softening agent. The method of claim 1, wherein the inorganic pigment,
A water-retaining concrete composition comprising at least one of red iron oxide, yellow iron oxide, chromium oxide, titanium dioxide, and carbon black. According to claim 1, The blast furnace slag,
A water-retaining concrete composition, characterized in that the blast furnace slag fine powder or blast furnace slag cement. A water-retaining concrete pavement method using the water-retaining concrete composition of any one of claims 1 and 4 to 11,
Laying the water retaining concrete composition on the upper side of the ground;
Spraying the release agent on the unconsolidated conservative concrete after finishing the plastering work;
Molding a pattern on the upper surface of the water-retaining concrete composition by using a forming mat;
Curing the water-retaining cement concrete composition; And
After removing the forming mat and coating with a surface protective agent; Repair concrete construction method comprising a.