KR102042161B1 - Polymer modified concrete composition and method for repairing pavement using the same - Google Patents

Abstract

The present invention relates to polymer modified concrete compositions.
Polymer modified concrete composition according to an embodiment of the present invention comprises a concrete comprising a polymer emulsion; And a fastening additive mixed at a repair site during pavement repair of a road, wherein the fastening additive includes a fastener, and the fastener comprises: a first quickener comprising steel gypsum; And a _second fastener comprising CaO and Al ₂ O ₃ ; and the polymer modified concrete composition is characterized in that it comprises a.

Description

POLYMER MODIFIED CONCRETE COMPOSITION AND METHOD FOR REPAIRING PAVEMENT USING THE SAME}

The present invention relates to a polymer modified concrete composition and a road pavement repair method using the same. Specifically, the present invention relates to a polymer-modified concrete composition and a road pavement repair method using the same, which can be repaired at the site of repairing the damaged part of the road pavement mixed at the repair site.

Pavement of good roads is important for the smooth use of roads that are the veins of modern society, but it is more important to maintain roads that are already paved.

In general, road pavement uses asphalt concrete or cement concrete. Recently, paving roads using cement concrete is more durable and lifespan than paving roads using asphalt concrete, so the amount of construction paving roads using cement concrete is gradually increasing.

However, in the case of cement concrete, it is more durable than asphalt concrete, and the reinforcing steel in the lower structure is corroded due to cracks generated during concrete construction and salt penetration by calcium chloride spraying in winter. This is considerably lowered and eventually the package is inevitably damaged.

If the package is broken in this way, it is necessary to repair the package. However, in the case of roads with heavy traffic (for example, highways), repair work should be completed within a short time. In other words, concrete needs to be laid and cured in a position that needs repair, and a certain strength or more needs to be secured within a fast time.

Recently, as a method of repairing a package that can secure a certain level or more of strength in a short time, a technology has been developed that can be constructed by mixing polymer latex (SBLatex) having rubber properties into concrete.

However, the latex modified concrete currently used has a very short working time of about 20 minutes, which limits the need to install and use special low-cost construction equipment such as mobile mixer trucks (M / M) at the repair site. have. As such, using a mobile mixer truck has various problems.

First, the mobile mixer can mix only 7 m ³ of concrete per hour, so the area that can be constructed per hour is significantly smaller.

Second, in the case of using a mobile mixer, since raw materials such as cement and aggregate must be stored in the vicinity of the site for site mixing, it is not easy to store the raw materials in urban areas, and the moisture content of the aggregate is not constant according to climatic conditions.

Third, due to the limitation of the equipment of the mobile mixer, the cement to be mixed in the mixer can only use one type of cement. Therefore, there is a limit in improving the salt resistance, strength, chemical resistance, etc. of the concrete can not be added to the various mixtures. In addition, in aggregate, aggregates having various particle sizes cannot be used, and only one type of aggregate should be used, so that the improvement of physical properties and quality control of concrete are not easy.

In addition to the use of latex modified concrete, cemented carbide is used in road pavement repairs for rapid curing. However, cemented carbide has a very high cost and is a major cause of lowering the economics of repair construction.

In order to replace such inexpensive cemented carbide cements, various technologies are being developed, one of which uses steel waste. In other words, the steel mill proceeds with the desulfurization process to remove sulfur during the steelmaking process. Steel gypsum, a by-product of the desulfurization process, can be used as a substitute for cemented carbide. Thus, by replacing the cemented carbide cement with steel waste, environmental problems and economics can be solved. However, when the cemented carbide cement is replaced with steel gypsum, the initial strength is low.

In conclusion, summarizing the problems of the above-described prior arts, it is urgent to develop a concrete composition that can secure strength within a short time to secure sufficient economic feasibility and at the same time reduce the repair construction time without using a mobile mixer. It is true.

The present invention has been made to solve the above problems, and an object thereof is to provide a polymer-modified concrete composition that can secure sufficient compressive strength within a short time despite replacing superhard cement with steel gypsum.

Polymer modified concrete composition according to an embodiment of the present invention for achieving the above object is a concrete comprising a polymer emulsion; And a fastening additive mixed at a repair site during pavement repair of a road, wherein the fastening additive includes a quickener, and the quickener comprises: a first quickener comprising steel gypsum; And a second fastener comprising CaO and Al ₂ O ₃ .

In one embodiment, the second fastener may be combined with CaSO ₄ included in the steel gypsum to form erttingite.

In one embodiment, the weight ratio of the first fastener to the second fastener may be characterized in that more than 0.21, less than 5.1.

In one embodiment, the quickening additive is 60 to 95% by weight of the fastener, 0.5 to 30% by weight of the high strength agent, 0.05 to 5% by weight of the coagulant and 0.05 to the weight of the quickener additive It may be characterized in that it comprises 6% by weight of a retardant and 0.05 to 5% by weight of a reducing agent.

In one embodiment, the coagulation accelerator may be any one or a combination thereof selected from the group consisting of aluminum sulfate (Al ₂ (SO ₄ ) ₃ ), forget-me-not, tunnel white, magnesium sulfate and sodium sulfate. .

In one embodiment, the retardant may be characterized in that the mixture of inorganic salts and organic sugars.

In one embodiment, the polymer emulsion may be characterized in that it comprises any one or a combination thereof selected from the group consisting of polyacrylic acid copolymer and polystyrene sulfonic acid copolymer.

In one embodiment, the polyacrylic acid copolymer and polystyrene sulfonic acid copolymer may be neutralized with an amine material or an inorganic salt.

In one embodiment, the polymer emulsion, 50 to 90% by weight of the liquid polymer, 1 to 20% by weight of the powder polymer, 1 to 14% by weight of the polymer strength accelerator, 0.5 to 20 based on the weight of the polymer emulsion It may be characterized by comprising a weight percent nonionic surfactant, 0.1 to 10% by weight of the fluid admixture and 0.1 to 10% by weight of the antifoaming agent.

In one embodiment, the concrete may be characterized in that it comprises 0.5 to 10% by weight of the polymer emulsion based on the weight of the concrete.

In one embodiment, it may be characterized in that it comprises 90 to 97% by weight of the concrete and 3 to 10% by weight of the fastener additive based on the weight of the total composition.

Road pavement repair method according to another embodiment of the present invention for achieving the above object, the step of cutting the pavement surface of the road that requires repair; Preparing a polymer-modified concrete composition by mixing a polymer emulsion with ready-mixed concrete and moving it to a repair site, followed by mixing a rapid additive at the repair site; And laying and curing the polymer-modified concrete composition on the cut pavement surface. Here, the polymer modified concrete composition is characterized in that the polymer modified concrete composition described herein.

Polymer modified concrete composition according to an embodiment of the present invention by using a steel gypsum as the first fastener, and at the same time using a _second fastener containing CaO and Al ₂ O ₃ , compared to the conventional polymer modified concrete composition It has a high advantage in terms of strength.

First, by using steel gypsum as the first fastener, it is possible to contribute to the prevention of environmental pollution by recycling steel waste, and to secure construction economics by replacing cemented carbide. In addition, by using the first fastener including the steel gypsum and the _second quickener including CaO and Al ₂ O ₃ together, it is possible to improve the expression compressive strength of the polymer-modified concrete composition according to an embodiment of the present invention have. In particular, it is possible to significantly improve the expression strength of the polymer-modified concrete composition according to the embodiment of the present invention by mixing the first and second quickeners in a specific ratio.

On the other hand, the polymer emulsion of the pavement concrete composition according to an embodiment of the present invention includes a mixture of a polyacrylic acid copolymer and a polystyrene sulfonic acid copolymer, to further increase the expression strength of the polymer-modified concrete composition according to an embodiment of the present invention Can be improved.

1 is a table showing the mixing ratio of the sample for experimenting with the effect of the fastening additive.
2 is a table showing the physical property test results for the samples described in FIG.
3 is a table showing the compounding ratio of the sample for experimenting with the effect of the retardant contained in the fastening additive.
4 is a table showing the physical property test results for the samples described in FIG.
Figure 5 is a table showing the mixing ratio of the sample for experimenting the effect of the polymer emulsion in a fixed amount of the fastening additive.
6 is a table showing the physical property test results for the samples described in FIG.
7 is a table showing the mixing ratio of the sample for experimenting with the effect of the fastening additive.
8 is a table showing the physical property test results for the samples described in FIG.
The accompanying drawings show that they are illustrated as a reference for understanding the technical idea of the present invention, by which the scope of the present invention is not limited.

In the following description of the present invention, when it is determined that the subject matter of the present invention may be unnecessarily obscured by the person skilled in the art with respect to the related well-known functions, the detailed description will be omitted.

Hereinafter, with reference to the accompanying drawings, it will be described for the polymer-modified concrete composition and road pavement repair method using the same according to an embodiment of the present invention.

Polymer modified concrete composition

The polymer modified concrete composition according to one embodiment of the present invention comprises concrete and fastener additives. The concrete and quickener additives described above can be mixed at the work site. In consideration of the compressive strength, workability, and the like of the concrete, 90 to 97% by weight of concrete and 3 to 10% by weight of the fastening additive may be mixed based on the weight of the total composition.

Hereinafter, each component will be described in detail.

(1) concrete

Concrete used in the present invention may be prepared by mixing water, cement, and aggregate, which are generally materials constituting concrete. Then, the polymer emulsion may be mixed to mix the concrete and ensure fluidity during the working time.

Portland cement (OPC) is usually used, but blast furnace slag cement, pozzolanic cement, high flow cement, low heat cement, multicomponent mixed cement, flame resistant cement, expandable cement, (ultra) crude steel cement to improve the properties of concrete Various special cements such as fine powder cements can be used. However, cemented carbide is not used as the main material as in the prior art. Mixing ratio of water, cement and aggregate is not particularly limited, it is also possible to follow the KS standards. For example, the amount of cement is 500 kg / m ³ or less, preferably 100 to 400, and kg / m ³ range, more preferably 200 ~ 350 kg / m ³ range per 1m ^3.

The polymer emulsion may include a liquid polymer, a powder polymer, a polymer strength accelerator, a nonionic surfactant, a fluid admixture, an antifoaming agent, and the like based on the liquid polymer.

The liquid polymer may be any one selected from the group consisting of acrylic emulsion resin, styrene butadiene (SB) latex, vinyl acetate ethylene (VAE), and polyvinyl acetate homopolymers (PVAc). For example, the liquid polymer may be an acrylic emulsion resin.

The acrylic emulsion resin may be prepared by using a common acrylic emulsion resin, or by adding an additive for improving performance to the common acrylic emulsion resin and then aging. Specifically, the acrylic emulsion resin was added to the reaction tank with ion-exchanged water and emulsifier and heated to 80 ° C while stirring, and then dissolved and stirred in pre-emulsion water and emulsifier in a pre-emulsion tank, and then the acrylic monomer (C4-C9). Acryl monomer and acrylic acid) are sequentially added to form a pre-emulsion state. Thereafter, the initiator was added to the reactor and the reaction temperature was maintained at 80-83 ° C. while uniformly dropping in the pre-emulsion tank for about 3 hours. After dropping, it is kept at 82 ° C. for 1 hour and cooled to 70 ° C. Thereafter, the mixture was treated with CHASER, held for 20 minutes, and cooled to 50 ° C. And it is prepared by stirring and aging for 2 hours by adding ammonia, antifoam, preservative and modifying additives.

The powdered polymer may be used by powdering liquid latex, VAE, and EVA (Ethylene-vinyl acetate). When the amount of polymer emulsion is low, the amount of solids can be increased by adding powdered polymer. Accordingly, the viscosity of the concrete is increased, and workability, material separation resistance, adhesion strength and chlorine ion permeation resistance are improved.

The polymer strength promoter may include any one selected from the group consisting of a polyacrylic acid copolymer and a polystyrene sulfonic acid copolymer or a combination thereof. As such a polyacrylic acid copolymer and a polystyrene sulfonic acid copolymer, what was neutralized with an amine substance or an inorganic salt can be used. The amine material is any one or combination thereof selected from the group consisting of triethanolamine (TEA), diethanolamine (DEA), cysteamine (MEA), diethanolisopropanolamine (DEIPA), and methacryloyloxyeicosyl dihydrogen phosphate (MEIP), and inorganic salts are Li, Ca, It is characterized by any one selected from the group consisting of carbonates such as Na, Mg. The polymer strength promoter may be prepared through a polymerization reaction.

Taking the polyacrylic acid copolymer as an example, first, a polymerization reactor, a thermometer, a condenser, a stirrer, a dropping funnel for a monomer, and a dropping funnel for an initiator are prepared. 100 g of distilled water, 100 g of acrylic acid, 10 g of sodium allyl sulfate, and 1.5 g of 2-mercaptoethanol are mixed with the dropping funnel for the monomer. Into the initiator dropping funnel, 2.0 g of ammonium persulfate was added to 10 g of distilled water and completely dissolved. Using two dropping funnels, the polymerization reaction is carried out while dropping the monomer and initiator solution over 2 hours. After completion of the initiator addition, the aging reaction was performed at 80 ° C. for 2 hours, and cooled to room temperature to obtain a light brown polyacrylic acid copolymer having a pH of 2.5. Then, 10 g of lithium carbonate is added to the polyacrylic acid copolymer, and then stirred at room temperature for one hour to synthesize a polyacrylic acid-based polymer strength promoter substituted with an inorganic salt.

The polymer strength accelerator promotes the adsorption and hydration promoting action of C4AF in cement, and rapidly increases the alkali saturation to increase the amount of hydrate produced and promotes the initial hydration reaction. That is, since the concrete of the polymer-modified concrete composition according to the embodiment of the present invention includes any one or a combination thereof selected from the group consisting of polyacrylic acid copolymer and polystyrene sulfonic acid copolymer as a polymer strength accelerator in a polymer emulsion, Increasing the initial strength of concrete, shortening the construction period and increasing the strength of concrete.

The nonionic surfactant may play a role of preventing agglomeration of cement. Nonionic surfactants include fatty acid diethanolamine compounds, amine oxides, nonylphenol ethylene oxide adducts, sorbitan esterified compounds, alkylpolyglycosides, fatty acid ethylene oxide adducts, polyethylene oxides, polypropylene oxides, and polyethylene polypropylene airborne compounds. Copolymer, higher fatty acid (C12 to C22) diethanolamine compound, higher fatty acid (C12 to C22) ethylene oxide (EO) adduct (1 to 50 EO), alkyl (C4 to C20) amine oxide, alkyl (C4 to C20) phenol ethylene oxide adducts (1 to 50 EO), sorbitan esterified compounds and ethylene oxide adducts (1 to 50 EO), alkyl (C1 to C20) polyclicosides (molecular weight 100 to 100,000) ), Higher alcohol (C4 to C20) ethylene oxide adducts (1 to 50 EO), polyethylene oxide (molecular weight 100 to 100,000), polypropylene oxide (molecular weight 100 to 100,000), polyethylene oxide and polypropylene oxide copolymer ( Molecular weight 100 to 100,00 0), polyethyleneimine (molecular weight 100-100,000), polyglycerol (molecular weight 100-100,000) may be any one or a combination thereof.

Fluidized admixtures may serve to increase slump. The fluid admixture may be any one selected from the group consisting of an AE water reducing agent, a water reducing agent, a high performance water reducing agent, a fluidizing agent, and a high fluidizing agent, or a combination thereof.

Antifoaming agent serves to improve the compressive strength and durability of concrete by inhibiting the generation of bubbles generated by the hydration reaction in the mixing process of the concrete composition. The antifoaming agent can use a silicone type antifoamer.

As described above, the polymer emulsion added to the concrete of the polymer-modified concrete composition according to the present invention contains a liquid polymer as a main material, and a liquid polymer, a powder polymer, a polymer strength accelerator, a nonionic surfactant, a fluid admixture, an antifoaming agent, and the like are mixed. In this case, many experiments were conducted on the mixing ratio of the above materials to derive the optimum content ratio of each material.

That is, the optimum content ratio of the polymer emulsion derived through experimental considerations is 50 to 90% by weight of the liquid polymer, 1 to 20% by weight of the powdered polymer, 1 to 14% by weight of the polymer strength accelerator based on the weight of the polymer emulsion. , 0.5 to 20% by weight of nonionic surfactant, 0.1 to 10% by weight of fluid admixture and 0.1 to 10% by weight of antifoaming agent.

In the polymer modified concrete composition according to the embodiment of the present invention, when the polymer emulsion described above is used in concrete, it is possible to remarkably reduce the fluidity drop of the concrete to secure work time required for road repair or bridge pavement. That is, sufficient time can be secured from the laying of concrete or the site layout plant to the time of laying and jointing the concrete, including the transportation time and waiting time from the work site. Therefore, the mobile mixer may not be used, thereby fundamentally avoiding the problem of using the mobile mixer truck. Furthermore, since the polymer emulsion of the polymer-modified concrete composition according to the embodiment of the present invention includes any one or a combination thereof selected from the group consisting of polyacrylic acid copolymer and polystyrene sulfonic acid copolymer as a polymer strength accelerator, a working time In addition to securing the properties of concrete is also improved.

Furthermore, looking at the content ratio of the concrete including the polymer emulsion described above, based on the weight of the concrete 3 to 10% by weight of water, 0.5 to 10% by weight of the polymer emulsion, 7 to 20% by weight of cement, 30 to 50 By weight fine aggregate and 25 to 45 weight percent coarse aggregate. Such concrete can be mixed with the polymer emulsion into ready-mixed concrete at the factory and then transported to the work site using a ready-mixed vehicle. That is, in the present invention, even if the acrylic emulsion resin is included in the concrete composition, fluidity can be maintained, and thus long distance transportation is possible regardless of the transport distance and time of the ready mixed concrete. Moreover, the ability to mix concrete in factories has many advantages in terms of quality control of concrete. For example, by mixing concrete in a KS-certified concrete production plant, the state of the raw materials can be kept constant, and only the concrete whose slump and air volume of the produced concrete meets the required quality can be selectively shipped.

(2) quickness additive

The quickening additive is for fast-hardness expression of the polymer-modified concrete composition according to one embodiment of the present invention. Conventional road repair polymer-modified concrete used cemented carbide as the main material in order to express fast hardening, but the construction economic efficiency is reduced due to the price of cemented carbide.

On the other hand, in the steel manufacturing process, iron ore and coal in the blast furnace is separated into molten water and blast furnace slag through a reduction action. Next, a desulfurization process is performed to remove impurities such as sulfur components in the molten metal through molten iron pretreatment before the steelmaking process is continued. That is, the reaction is performed with limestone to remove the sulfur component in the metal. When CaO and sulfur component of limestone are combined, gypsum (CaSO ₄ ), an anhydride, is formed, and the non-reactant remains in the CaO state. Research into using the steel gypsum produced through the desulfurization process as a substitute for cemented carbide is in progress. However, using only steel gypsum as a fastener there is a lack in the physical properties of the concrete bar, the present invention is intended to solve this problem.

Quickness additives included in the polymer-modified concrete composition according to an embodiment of the present invention is composed of a fastener, a high strength agent, a coagulant and a water reducing agent. In addition, the fastening additive included in the polymer-modified concrete composition according to the embodiment of the present invention may further include a retardant.

In the present invention, the fastener comprises a second quickener including CaO and Al ₂ O ₃ together with the first quickener including steel gypsum.

As described above, the first quickener may include steel gypsum generated in a desulfurization process in the steel manufacturing process. The steel gypsum produced through the desulfurization process is composed of CaO and SO ₃ in a ratio of about 6: 4, and can be combined with calcium aluminate mineral (C12A7) to form ertingite. The powderiness of the steel gypsum may be at least 5,000 cm ² / g. If the gypsum powder is less than 5,000 cm ² / g, there is a problem that the compressive strength of the concrete is low because the reactivity is low.

The second quickener comprises CaO and Al ₂ O ₃ . Looking at the composition of the second fastener may be composed of 45 to 55% by weight of CaO, 35 to 45% by weight of Al ₂ O ₃ , and other additives. The materials constituting the secondary quickener may bind Ca (OH) ₂ and CaSO ₄ to significantly increase the production of ethrinzite. That is, the compressive strength of the concrete can be improved by using steel gypsum as the first fastener and simultaneously using the above-mentioned second quickener together with the first quickener. The second quickener is 3,000 ~ 3,500 cm ² / g powder

As such, in order to further improve the compressive strength of the concrete, an appropriate content ratio of the first quickener and the second quickener could be derived through experiments. The weight ratio of the first quickener to the second quickener may be greater than 1 but less than 5.1. If the weight ratio of the first quickener to the second quickener is 5.1 or more, the ratio of steel gypsum is too high, and the compressive strength of the second two hours and the four-hour compressive strength of the gypsum decreases, and if it is one or less, the fastening is faster, and the particles of ethrinzite are faster. The lower the compressive strength of the initial steel age 2 hours and the age of 4 hours. In the polymer-modified concrete composition according to the embodiment of the present invention, the weight ratio of the first quickener to the second quickener satisfies more than 1 and less than 5.1, thereby significantly improving the compressive strength of 2 hours and 4 hours of age. Can be.

The coagulation accelerator may be any one selected from the group consisting of aluminum sulfate (Al ₂ (SO ₄ ) ₃ ), manganese, tunnel white, magnesium sulfate, and sodium sulfate, and preferably aluminum sulfate. Aluminum sulfate is generally used as a material for purifying and flocculating water, but when included as a coagulant accelerator in the rapid addition additive, it increases the initial calorific value and promotes the formation of ethrinzite. Specifically, as described above, by using the first and second fasteners together, the initial strength can be improved by increasing the formation of etrinzite. In addition to the first and second fasteners, a coagulation accelerator, that is, By adding aluminum sulfate, the initial compressive strength can be further improved by maximizing the production of ethrinzite at the beginning.

In road pavement repair, it is necessary to prevent the deterioration of fluidity for the workability as well as to improve the compressive strength of concrete. To this end, the fastening additive included in the polymer-modified concrete composition according to the embodiment of the present invention may further include a retardant. The retardant may be used by mixing inorganic salts and organic salts instead of singly. The inorganic salts may be any one or a combination thereof selected from the group consisting of tartaric acid, citric acid, phosphoric acid, and the like. The organic sugar may be any one selected from the group consisting of sodium gluconate, sugar and the like or a combination thereof. When inorganic salts or organic sugars are used alone as retardants, initial condensation may be very slow or delayed, and the compressive strength of concrete may be lowered in the long term. In detail, the inorganic salts act to slow the production of ethrinzite by acting on the fastener, and the organic sugars act on the cement to delay the hydration of the cement. Since the fastener additive of the polymer-modified concrete composition according to an embodiment of the present invention is used by mixing an inorganic salt and an organic sugar as a retardant, it is possible to improve workability by preventing fluidity deterioration without the aforementioned problem.

The sensitizer may be any one selected from the group consisting of polycarboxylate powder, naphthalin powder, melamine powder, and nigrin powder.

As described above, the quickening additive included in the polymer-modified concrete composition according to the present invention is used by mixing a fastener, a high strength agent, a coagulant, a retarder, and a water reducing agent. The optimum content ratio of each material could be derived.

That is, the optimal content ratio of the quickening additive derived through the experimental considerations is 60 to 95% by weight of the fastener, 0.5 to 30% by weight of the high strength agent, 0.05 to 6% by weight based on the weight of the quickening additive It may consist of a coagulant and a 0.05-5 wt% retardant and a 0.05-5 wt% water reducing agent.

In the polymer-modified concrete composition according to the embodiment of the present invention, when the above-mentioned fastening additive is used in concrete, various effects can be expected.

That is, by using steel gypsum as the first quickener, steel waste can be recycled, carbon dioxide can be reduced, and construction can be secured by limiting the use of cemented carbide. In addition, by using a composition including CaO and Al ₂ O ₃ as the _second fastener can be solved the problem of lowering the compressive strength when using steel gypsum as the first fastener. In addition, it is possible to improve the initial compressive strength by using aluminum sulfate as a coagulation accelerator. Apart from this, workability can be ensured by mixing inorganic salts with organic sugars.

Road pavement repair method

Road pavement repair method according to another embodiment of the present invention can be largely divided into three steps.

First, a step of removing broken parts such as cracks, cracks, pop-outs, etc. on the pavement surface is performed. The broken pavement is cut or broken by using known equipment to remove the broken parts. After removing the damaged parts, the preparatory work for the pavement surface is completed by carrying the deteriorated surface with high pressure washing water in the place where the package is removed.

Next, to prepare a concrete composition for repair pavement. Road pavement repair method according to another embodiment of the present invention is a polymer modified concrete composition according to an embodiment of the present invention described above as a road pavement concrete composition. According to the present invention, unlike the conventional road pavement repair method, the concrete and the polymer emulsion are pre-mixed in the factory and then moved to the site using a ready-mixed vehicle.

The polymer modified concrete composition is prepared, and the polymer modified concrete is laid in the cut part of the pavement. That is, the concrete composition is filled and cured.

Finally, when the joint is installed on the road surface, the road pavement repair method according to the present invention is completed.

Road pavement repair method according to another embodiment of the present invention uses a polymer-modified concrete composition according to an embodiment of the present invention, the polymer-modified concrete according to an embodiment of the present invention while using steel gypsum as a fastener, The short-term and long-term compressive strength shortage of concrete can be compensated by the second fastener to satisfy the economics of construction and the properties of concrete. In addition, it is possible to further improve the physical properties and workability of the concrete by using a coagulation accelerator or a retarder.

Example

The researchers experimented with changing the composition ratio of the polymer-modified concrete composition according to one embodiment of the present invention.

In FIG. 1, the first fastener used steel gypsum, the second fastener used CaO and Al ₂ O ₃ in a mixture containing about 5: 4, aluminum sulfate as a coagulant, and metakaolin as a high strength agent. The fluidizing agent and the antifoaming agent used a polycarboxylic acid powder and a silicone antifoaming agent, respectively. In addition, the polymer strength accelerator of the polymer emulsion was a polyacrylic acid copolymer neutralized with an inorganic salt. In addition, other materials appropriately selected materials used for the purpose in the art.

First, an experiment was conducted to determine the effect of the fastening additive.

Figure 1 is a table showing the mixing ratio of the sample for testing the effect of the fastening additives, Figure 2 is a table showing the results of the physical property test for the samples described in FIG. Referring to Figure 1, the water-cement ratio and the content of the sand, the fluidizing agent and the antifoaming agent were constant, and the composition of the fastening additive was changed to confirm the performance of each formulation.

Sample 1 is a conventional quenching additive that is used in the prior art, Samples 2 to 6 is to change the composition ratio of the quenching additive described in an embodiment of the present invention.

Considering that the present invention is mainly used for road repair or bridge pavement, the main characteristics to be considered may be 4 hours of compressive strength.

However, referring to Sample 1, it can be seen that the compressive strengths of 2 hours and 4 hours are very low when using the general quickness additive.

On the contrary, in the case of Samples 2 to 6 using the quickness additive according to the embodiment of the present invention, it can be confirmed that the compressive strength of 4 hours and at least 20 MPa or more is satisfied.

In the case of Sample 2, an excess of the second fastener was used. Specifically, it can be seen that the weight ratio of the first quickener to the second quickener is 0.21, indicating that the second quickener is excessive. In this case, the formation of ethrinzite is promoted, and the compressive strength within 2 hours is sufficiently improved. However, due to rapid quenching, the ethrinzite particles are large and the matrix is loose. It can be seen that is low.

In the case of sample 3, a trace amount of a second rapid binder was used. In detail, it can be seen that the weight ratio of the first quick setter to the second quick setter is 5.1, so that the second quick setter is very small. The polymer-modified concrete composition according to an embodiment of the present invention uses steel gypsum as the first fastener, and despite the use of a coagulation accelerator, it can be seen that the compressive strength is very low for 2 hours and 4 hours. Moreover, there is a problem that the overall compressive strength is low regardless of the flow in time.

Unlike Sample 2 and Sample 3, it can be seen that in the case of Sample 4, in which the weight ratio of the first and second fasteners is greater than 0.21 and less than 5.1, the compressive strength is improved as compared with Samples 2 and 3. In particular, it can be seen that Sample 4 has improved overall compressive strength than Samples 2 and 3 without using a coagulant and a high strength agent. In order to improve short and long term compressive strength of concrete, The weight ratio can be made to satisfy more than 0.21 and less than 5.1.

Referring to samples 5 and 6, it can be seen that by further including a high strength agent in the fastening additive, it is possible to improve the long-term compressive strength of the concrete.

In particular, by using appropriate amounts of the first and second fasteners, coagulants, and high-strength agents as in Sample 6, the short-term compressive strength and long-term compressive strength are remarkably improved compared to the case of using the conventional quickening additive (Sample 1). You can see that.

Next, an experiment was conducted to determine the effect of the retardant.

Figure 3 is a table showing the mixing ratio of the sample for experimenting the effect of the retardant contained in the fastening additive, Figure 4 is a table showing the results of the physical property test for the samples described in FIG.

Sample 7 is an example that does not include a retardant, and Samples 8 to 12 are examples in which the total amount of the retardant is the same, but the ratio of inorganic salts and organic sugars constituting the retardant is different.

Referring to the experimental results, the slump was carried out according to KS F 2402, it can be seen that the sample 7 is no longer flow after the initial slump represented 140 mm.

For samples 8 and 9, only inorganic salts were used (sample 8) or organic sugars were used (sample 9), respectively. When only inorganic salts were used as the retardant as in Sample 8, the flow was not observed anymore after 20 minutes because of its weakness as a retardant. In the case of using only organic sugar as a retardant as in Sample 9, there was no problem of slump, but it was confirmed that the initial coagulation decrease and the long-term strength expression were very low.

Therefore, mixing inorganic salts and organic salts together as a retarder as in Samples 10 to 12 is a method that can solve both the slump problem and the strength problem. More preferably, it is possible to minimize the occurrence of a strength problem by increasing the amount of the inorganic salt used as the retarder to be larger than the organic sugar or at least equal to the organic sugar.

Next, an experiment was conducted to determine the effect of the polymer emulsion.

Figure 5 is a table showing the mixing ratio of the sample for experimenting the effect of the polymer emulsion in a fixed amount of the fastening additive. 6 is a table showing the physical property test results for the samples described in FIG.

Sample 13 is an example using only a fluidizing agent, and Samples 14 to 17 were conducted by adding liquid polymer, polymer powder, surfactant, and polymer strength accelerator, respectively. Samples 17 to 19 were measured by varying the content of the polymer strength promoter.

First, looking at the samples 13 to 15, it can be seen that the fluidity is lost at age 20 to 30 minutes, respectively. In particular, in the case of the sample 14 using the excess liquid polymer it can be seen that the short-term compressive strength is lower than the other samples.

Comparing samples 16 to 19, it can be seen that the use of an appropriate amount of the polymer strength promoter improves the short and long term compressive strength as a whole. However, in the case of using an excess strength promoter (Sample 17), it can be seen that the fluidity is lost at the age of 30 minutes and at the same time, the strength is lowered. Therefore, the polymer strength promoter may be included only 1 to 14% by weight based on the weight of the polymer emulsion, thereby ensuring both workability and strength.

Finally, the physical properties of the fastening additives were measured.

Figure 7 is a table showing the mixing ratio of the sample for testing the effect of the fastening additives, Figure 8 is a table showing the results of the physical property test for the samples described in FIG. In samples 20 to 23 the polymer emulsion comprised 94 kg of 2,102 kg of concrete.

In the case of Sample 20 containing no quenchable additive at all, it was not cured at 4 hours, and thus strength measurement was impossible.

In the case of Sample 21, the content of the rapid additive is less than 3% by weight based on the total composition, it can be confirmed that the compressive strength of 4 hours low as 15.0 MPa.

In contrast, samples 22 and 23 were confirmed to have a high compressive strength from age 4 hours to age 28 days. However, when comparing the samples 22 and 23, it can be seen that the compressive strength tends to decrease again as the content of the fastening additive is increased compared to the concrete.

The protection scope of the present invention is not limited to the description and expression of the embodiments explicitly described above. In addition, it is again noted that the scope of protection of the present invention may not be limited due to obvious changes or substitutions in the technical field to which the present invention pertains.

For reference, in FIG. 1, FIG. 3, FIG. 5, and FIG. 7, the portion where no data is displayed means that the corresponding material is not added. 2, 4, 6, and 8, the couple whose data are not displayed indicates a case in which measurement is impossible.

Claims (12)

Concrete, including polymer emulsions; And
It includes a quick-drying additive which is mixed at the repair site during the pavement repair of the road,
The quickener additive comprises a quickener,
The fastener,
A first quickener comprising steel gypsum; And
Including a second rapidener comprising CaO and Al ₂ O ₃ ;
The secondary filler comprises 45 to 55% by weight of CaO, 35 to 45% by weight of Al ₂ O ₃ and the addition of the remainder,
And the weight ratio of the first quickener to the second quickener is greater than 0.21 and less than 5.1. The method of claim 1,
The second fastener is combined with CaSO 4 contained in the steel gypsum polymer modified concrete composition, characterized in that to form Ettringite (Ettringite). delete The method of claim 1,
The fastening additive,
60 to 95 weight percent of a fastener, 0.5 to 30 weight percent of a high strength agent, 0.05 to 5 weight percent of a coagulant and 0.05 to 6 weight percent of a retardant and 0.05 to 5 weight percent based on the weight of the quickening additive Polymer modified concrete composition comprising a water reducing agent. The method of claim 4, wherein
The coagulant accelerator is any one selected from the group consisting of aluminum sulfate (Al ₂ (SO ₄ ) ₃ ), manganese, magnesium sulfate and sodium sulfate or a combination thereof. The method of claim 4, wherein
The retarder is a polymer-modified concrete composition, characterized in that the mixture of inorganic salts and organic sugars. The method of claim 1,
The polymer emulsion is a polymer modified concrete composition, characterized in that it comprises any one or a combination thereof selected from the group consisting of polyacrylic acid copolymer and polystyrene sulfonic acid copolymer. The method of claim 7, wherein
The polyacrylic acid copolymer and the polystyrene sulfonic acid copolymer are neutralized with amine materials or inorganic salts. The method of claim 1,
The polymer emulsion,
50 to 90% by weight of the liquid polymer, 1 to 20% by weight of the powdered polymer, 1 to 14% by weight of the polymer strength accelerator, 0.5 to 20% by weight of the nonionic surfactant, based on the weight of the polymer emulsion A polymer modified concrete composition comprising 10% by weight of a fluid admixture and 0.1 to 10% by weight of an antifoaming agent. The method of claim 1,
The concrete,
Polymer modified concrete composition, characterized in that it comprises 0.5 to 10% by weight of the polymer emulsion based on the weight of the concrete. The method of claim 1,
The content of the fastening additive,
A polymer modified concrete composition, characterized in that it comprises 90 to 97% by weight of concrete and 3 to 10% by weight of fastening additives based on the weight of the total composition. Cutting the pavement of the road in need of repair;
Preparing a polymer-modified concrete composition by mixing a polymer emulsion with ready-mixed concrete and moving it to a repair site, followed by mixing a rapid additive at the repair site; And
And laying and curing the polymer-modified concrete composition on the cut pavement surface.
The polymer modified concrete composition is a road pavement repair method, characterized in that the polymer modified concrete composition according to any one of claims 1, 2, 4 to 11.

Images