WO2015141941A1

WO2015141941A1 - Polymer-modified concrete composition and method for repairing pavement of road using same

Info

Publication number: WO2015141941A1
Application number: PCT/KR2015/000729
Authority: WO
Inventors: 허형석; 노재호; 이태경; 정혁진
Original assignee: (주)제이엔티아이엔씨
Priority date: 2014-03-20
Filing date: 2015-01-27
Publication date: 2015-09-24
Also published as: KR101507934B1

Abstract

The present invention relates to a polymer-modified concrete composition for repairing the pavement of a road and a method for repairing the pavement of a road using the same. The method for repairing the pavement of a road according to the present invention comprises the steps of: crushing a pavement surface of the road, which is in need of repair; mixing a polymer emulsion with ready-mixed concrete, transferring the mixture to a location of the repair, and mixing a quick-setting additive with the mixture at the location of the repair to prepare a polymer-modified concrete composition; and spreading the polymer-modified concrete composition on the crushed pavement surface, followed by curing. Further, the polymer-modified concrete composition used to repair and pave a road comprises ready-mixed concrete, a polymer emulsion, and a high-strength quick-setting additive. Particularly, the polymer emulsion contains an amine-based strength accelerator and a polymer surfactant, and the high-strength quick-setting additive contains precipitated silica.

Description

Polymer modified concrete composition and road pavement repair method using the same

The present invention relates to a modified concrete composition in which a polymer such as acrylic is mixed, and a road pavement repairing method capable of quickly repairing a broken part of a road using the polymer modified concrete composition.

Road pavement uses asphalt concrete or cement concrete.

Asphalt concrete is deformed and cracked due to softening of asphalt in high temperature and high humidity environment in summer, leading to breakage of the package. Rainwater that penetrates into the pavement moves between the pavement and the substructure to space the joints and freezes during the winter to cause pop-out of the ascon pavement. Due to these problems, the highway is repairing asphalt concrete pavement every three years.

Cement concrete pavement is corroded by reinforcing steel in the substructure due to the cracks generated during concrete construction and salt penetration by calcium chloride spraying in winter, and accelerated aggregate alkali reaction, which significantly reduces the durability of concrete. It is true.

However, since the concrete pavement has the advantage of superior durability and durability life as compared to asphalt concrete, the amount of construction is increasing gradually in recent years.

On the other hand, if the pavement of high traffic roads such as a highway is damaged, the repair work should be completed for a short period. As a method of repairing a damaged package, a patching repair method using ascon or cemented carbide cement has been used in the past, but recently, a technology has been developed to mix and construct a polymer latex (SBLatex) having rubber properties into concrete. It is built. This technique has the advantage of increasing the adhesion strength and flexural strength of the concrete by homogeneously dispersing the latex homogeneously in the concrete and preventing the diffusion of chlorine ions by latex filling the micro voids of the concrete.

However, the latex modified concrete currently used has a limitation that requires special installation equipment such as a mobile mixer truck (M / M) to be installed and used at the repair site. That is, since the working time of the latex modified concrete is very short, about 20 minutes, since it can not be mixed and transported in the ready-mixed concrete plant like general ready-mixed concrete, it is being constructed using a mobile mixer so that it can be directly compounded and poured in the field.

However, many problems arise when using a mobile mixer to blend latex modified concrete as described above.

First of all, the mixing speed is very slow. Since the mobile mixer can mix only 7 m ³ of concrete per hour, there is a problem that the area that can be constructed per hour is very small.

In addition, when using a mobile mixer, since raw materials such as cement and aggregate are stored in close proximity to the site, it may be difficult to secure a suitable place in a crowded downtown area. It is difficult to control the slump, so quality control is not easy.

In addition, in case of mobile mixer, only one type of cement can be used due to the limitation of equipment configuration, and it is not possible to add various mixed materials such as blast furnace slag powder and silica fume, so it is difficult to improve the salt resistance, strength and chemical resistance of concrete. have.

Similarly, in aggregate, aggregates having various particle sizes cannot be used, and only one type of aggregates must be used, so there is a problem in that the improvement of physical properties and quality control of concrete are not easy.

On the other hand, the cement used in the conventional paving repair method is acting as a major cause of lowering the economics of repair work by using a super fast cement for rapid curing.

The present invention is to solve the above problems, while limiting the use of cemented carbide cement, using the polymer emulsion and the fastener additives of the optimized composition to improve the workability, economical efficiency of the road pavement repair as well as pavement quality The purpose is to provide a modified concrete composition.

In addition, the present invention can improve the construction quality and speed by using the above-described polymer modified concrete composition, without providing a mobile mixer, by providing a method for stably mixing the ready mixed concrete and polymer emulsion in the factory. The purpose is to provide packaging repair methods.

Road pavement repair method according to the present invention for achieving the above object, the step of cutting the pavement surface of the road that needs to be repaired, after mixing the polymer emulsion in the ready-mixed concrete to move to the repair site, the rapid additive additive Mixing at the repair site to produce a polymer modified concrete composition and laying and curing the polymer modified concrete composition on the cut pavement surface.

In addition, the polymer-modified concrete composition according to the present invention includes concrete, a polymer emulsion, and a quick additive. Polymer emulsion resin is mixed in the range of 1 to 15% by weight relative to the concrete.

In the present invention, by using a polymer emulsion and a high strength fastener additive material, many advantages appear over the conventional road pavement repair concrete composition.

First, by using a polymer emulsion of a unique composition can be mixed concrete in a factory with excellent working conditions unlike the existing, polymer emulsion can also be mixed in the factory and transported to the road repair site. That is, since the fluidity of the concrete composition can be secured for a long time, there is an advantage that the concrete composition can be stably manufactured at a factory to ensure the quality of the concrete composition. Moreover, in the past, due to the use of mobile mixers in the field, it was not possible to mix a large amount of concrete in a short time, but by constructing ready-mixed concrete at the factory and moving to ready-mixed vehicles, the amount of concrete supplied per unit time was dramatically increased, and the construction period was shortened. You can.

In addition, by using a high-strength fastener additive material of a unique composition, it does not use cemented carbide cement as in the conventional road repair concrete, there is an advantage that the economics of construction excellent.

1 is a schematic flowchart of a road pavement repair method according to an embodiment of the present invention.

Figure 2 is a table showing the mixing ratio of the sample for experimenting the effect of the high-strength fastener additives.

3 is a table showing the physical property test results for the samples described in FIG.

4 is a table showing the mixing ratio of the sample for experimenting with the effect of the modified polymer emulsion.

5 is a table showing the physical property test results for the samples described in FIG.

6 is a table showing the compounding ratio of the sample in the experiment to determine the effect of changing the compounding ratio of the high-strength fastener additive in a fixed state of the polymer emulsion.

7 is a table showing the physical property test results for the samples described in FIG.

8 is a table showing the compounding ratio of the sample in an experiment to determine the effect of changing the compounding ratio of the polymer emulsion in a state in which the high-strength fastener additive amount is fixed.

9 is a table showing the physical property test results for the samples described in FIG.

The polymer modified concrete composition includes concrete and a polymer emulsion and a fastener additive. Polymer emulsion resin is mixed in the range of 1 to 15% by weight relative to the concrete.

In one embodiment of the present invention, the polymer emulsion comprises an amine-based strength promoter, preferably at least one of ethanolamine and isopropanolamine.

More specifically, the polymer emulsion, 75 ~ 97.5% by weight of the acrylic emulsion resin, 0.05% by weight of the polymer surfactant, 0.05-5% by weight of glycerin, 0.05-5% by weight of the amine strength accelerator, 0.05-5% by weight of aluminum hydration accelerator %, A reducing agent of 0.05 to 5% by weight can be mixed.

And, it is preferable that the quick setting additive includes precipitated silica.

More specifically, the fastening additive is 10 to 50% by weight of the high strength material, 0.05 to 5% by weight of the coagulation accelerator, 30 to 80% by weight of the fastener, 0.05 to 5% by weight of the heating material, 0.05 to 5% by weight of the stabilizer, It can be mixed in the ratio of 0.05-3 weight% of retardants and 0.05-2 weight% of a reducing agent.

Hereinafter, with reference to the accompanying drawings, it will be described in more detail with respect to the road pavement repair method according to an embodiment of the present invention and the polymer-modified concrete composition used therein.

1 is a schematic flowchart of a road pavement repairing method according to the present invention.

Referring to Figure 1, the road pavement repair method according to an embodiment of the present invention is largely divided into three steps.

The first step is to remove any damaged parts such as cracks and pop-outs from the pavement surface. Using known equipment, the damaged pavement is cut or broken to remove it. After removing the damaged parts, the preparatory work for the pavement surface is completed by retaining the deteriorated surface by using high pressure washing water in the place where the package is removed.

The second step is to prepare the concrete composition for repair pavement. Polymer modified concrete compositions according to the invention are used. The polymer modified concrete composition according to the present invention mainly consists of three components. That is, concrete, a polymer emulsion, and a quick additive. Unlike the conventional road pavement repair method, the present invention is unique in that concrete and polymer emulsions are pre-mixed in a factory and then moved to the site using a ready-mixed vehicle. In addition, in the field, the high-strength fastener additive is further mixed to blend the polymer-modified concrete composition.

As described above, when the polymer-modified concrete composition is prepared, the polymer-modified concrete composition is laid in the cut portion 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.

According to the present invention, unlike the conventional method of directly mixing cement, aggregate, and water at a repair site to form concrete, the present invention mixes in a factory to make ready-mixed concrete, and also incorporates polymer emulsion into concrete. In this respect, there is a big difference from the existing road repair paving method. In addition, there is a difference from the existing method in that the high-strength fastener additive is used in the concrete composition for road repair pavement.

The polymer modified concrete composition is composed of concrete and polymer emulsion. As described above, conventionally, a method of directly mixing materials in the field using a mobile mixer was used. Mixing materials in the field as in the prior art introduces many problems. First of all, it is not easy to manage the moisture content of materials according to rainfall and temperature because materials are placed on site. And since the mobile mixer can mix only 7m ³ of concrete per hour, the construction amount per hour is very small. In addition, due to the limitations of the mobile mixer, only a single type of cement can be used, and various additives such as blast furnace slag and silica fume cannot be mixed, thereby making it difficult to improve the properties of the concrete composition. In spite of these problems, the reason why the conventional site mixing method was selected during road repair is because the fluidity of the concrete is kept short for about 20 to 30 minutes when the polymer emulsion is mixed with the concrete.

However, in the present invention, cement, aggregate, and water are mixed in the factory, and the ready mixed concrete moving to the ready-mixed vehicle is used. The polymer emulsion is also mixed in the factory first, and then takes the method of moving to the site through the ready-mixed vehicle.

In addition, in the present invention, unlike the conventional repair packaging using high-strength fastener additives, super fast cement does not use or minimally improve the economics of construction.

This solves all the problems of quality control, limitations of improvement of physical properties, and the amount of construction per hour, which have been a problem in the prior art. The reason for solving the conventional problems in the present invention is due to the unique composition and blending ratio of the polymer modified concrete composition according to the present invention.

Hereinafter, the polymer modified concrete composition used in the present invention will be described in more detail.

The polymer modified concrete composition according to the present invention consists of concrete and polymer emulsion and high strength quenchable additives.

In the present invention, concrete is prepared by mixing cement with aggregate and water, and cement is generally used portland cement, but may also use (ultra) crude steel cement or slag cement. However, cemented carbide is not used as the main material. There is no special condition in the mixing ratio of cement, aggregate and water and the KS standard is applied as it is. For example, 1m ³ The amount of cement per 500kg / m ³ or less, preferably in the range of 100 ~ 400kg, and more preferably in the range of 200 ~ 350kg / m ^3.

Polymer emulsions are intended to modify concrete with polymer latex as the main material. The latex homogeneously dispersed in the concrete increases the adhesion strength and the bending strength of the concrete, and serves to prevent the diffusion of chlorine ions by filling the micro voids of the concrete.

In the present invention, the polymer emulsion may include a modified additive such as a polymer surfactant, glycerin, an amine strength accelerator, an aluminum hydration accelerator, and the like based on an acrylic emulsion resin. However, acrylic emulsion resins, polymer surfactants and amine strength accelerators are incorporated as essential materials.

The acrylic emulsion resin may be prepared by adding an additive for improving performance to a general acrylic emulsion resin and then aging. More specifically, in the acrylic emulsion resin, ion-exchanged water and an emulsifier are added to the reaction tank and heated up to 80 ° C. while stirring, and then, the ion-exchange water and emulsifier are dissolved and stirred in a pre-emulsion tank, and then the acrylic monomer (C4-C9 Acryl monomer and acrylic acid) are added in order to make a pre-emulsion state. After the initiator is added to the reaction tank and while maintaining the reaction temperature at 80 ~ 83 ℃ while uniformly dropping for about 3 hours in the pre-emulsion tank. After dropping, it is kept at 82 ° C. and cooled to 70 ° C. for 1 hour. After that, the CHASER treatment is performed and held for 20 minutes and cooled to 50 ° C. In addition, ammonia, antifoaming agent, preservative, and the modifier added in the present invention are prepared by stirring and aging for 2 hours.

Polymeric surfactants as modifiers are used to prevent condensation of concrete and to prevent aggregation of acrylic particles. Polymeric surfactants for preventing concrete condensation include dichlorodiphenyldi (tri) coloethane (TDE; p, p'-dichlorodiphenyldi (tri) chloroeth ane), nonylphenol (NP; nonylphenol), and sodium lauryl sulfate (SLES). At least one of sodium laureth sulfate) and α-olefin sulfonate (AOS).

Glycerin (or glycerol) is to prevent material separation of polymer modified concrete, colorless, odorless liquid, and has a very high viscosity to prevent material separation and improve workability when mixed with concrete.

Amine-based strength accelerators increase the initial strength of concrete, shorten the construction period and increase the strength of concrete.

Amine-based strength accelerator for increasing concrete strength is a compound in which hydrogen atoms of ammonia (NH ₃ ) are substituted with one to three hydrocarbon groups (R). Monoethanolamine (MEA; Monoethanolamine) , At least one of triethanolamine (TEA; Triethanolamine), monoisopropanolamine (MIPA; Monoisopropanolamine), diisopropanolamine (DIPA; Diisopropanolamine), and triisopropanolamine (TIPA; Triisopropanolamine).

In order to express the initial strength, an aluminum catalysis accelerator may be additionally used. At least one of sodium aluminate (NaAlO ₂ ) and aluminum sulfate (Al ₂ (SO ₄ ) ₃ ; aluminum sulfate) may be used as the aluminum conversion accelerator.

In addition, polycarboxylic acid-based high performance water reducing agent can be mixed to secure workability, and cement hydration retardant can be mixed to prevent slump change of concrete.

Cement Hydration Delay Agent mixes one or more of Tartaric Acid, Sodium Gluconate, Citric Acid, Phosphate, and Glucose. As antifoaming agent, silicone type or alcohol type can be added.

The polymer emulsion can be mixed in the concrete at a ratio of 1 to 15% by weight of the concrete. In one embodiment of the present invention, the acrylic emulsion resin 75 ~ 97.5% by weight, polymer surfactant 0.05% by weight, glycerin 0.05-5% by weight, amine-based strength promoter 0.05-5% by weight, aluminum hydration promoter 0.05-5% by weight Mix in proportion of 0.05-5% by weight

In the polymer emulsion of the above composition, the important materials of the present invention are a polymer surfactant and an amine strength promoter.

Previously, polymer modified concrete was inevitably compounded on site because mixing acrylic emulsion resin caused slump loss as a result of condensation on concrete. In the present invention, this problem is solved by using the polymer surfactant of the above-mentioned material.

In addition, the amine-based accelerators not only increase the strength of the concrete itself, but in particular, the initial strength is formed high, thereby reducing the vehicle traffic suppression time for repair to a minimum.

On the other hand, the high-strength quenchable additive is for rapid hardening of the polymer-modified concrete. In the conventional road repair polymer modified concrete, high-speed super hard cement was used as a main material to express fast hardening, which acted as a main cause of increasing construction economics of road repairing concrete. In the present invention, by blending the high-strength quick-adding additive to the concrete in the field, not only can shorten the construction period without using expensive superhard cement, but also increases the strength of the concrete.

High-strength fastener additives are composed of a high strength material, a fastening material, a heating material, a condensation accelerator, a stabilizer, a retardant, a high performance water reducing agent.

In the present invention, precipitated silica is used as the high strength material. It is also possible to use silica fume and type II anhydrous gypsum together.

Sedimented silica is a particle having a BET specific surface area of about 220 to 350 cm ² / g, prepared by reacting an alkali silicate aqueous solution with an acid, and having a very small particle diameter, which has an excellent effect of filling fine pores of concrete. It also exhibits a higher level of reactivity than silica fume in chemical change of particulates. However, due to the property of absorbing water on the surface of particles, the number of compounding may increase, so the amount of use should be adjusted by testing.

In addition, "BET specific surface area" means S. Bruno, P. H. Emmett, this. J. Am. By S. Brunaure, P. H. Emmett, E. Teller. Chem. The specific surface area measured by applying the multi-molecular layer adsorption theory described in Soc., 60, 309 (1938) is considered to correspond to the average primary particle diameter of silica. For example, as described in the Powder Engineering Sculpture "Revision Supplementary Powder Property Sculpture" (1985), assuming that the primary particles are spherical, the following equation (a) is obtained between the specific surface area and the average diameter of the primary particles: 1), the larger the specific surface area, the smaller the average primary particle size.

D = 6 / (S · ρ) ... equation (1)

(Where D is the average primary particle diameter, S is the specific surface, and ρ is the density of the particle)

Silica fume is a generic name of by-products generated by floating in exhaust gas when silicon alloys such as silicon or ferrosilicon are manufactured in electric arc furnaces. It is put into an electric furnace to produce ferrosilicon at a high temperature of about 2,000 ℃. At this time, the intermediate product SiO is gasified, which is oxidized by air to SiO ₂ and condensed again to produce ultrafine particles. The produced ultrafine particles are recovered by using an electrostatic precipitator to obtain silica fume. Silica fume is composed of more than 90% of spherical shape, particle size is less than 1μm, average particle size is about 0.1μm, specific surface area is about 20m ² / g and specific gravity is about 2.1 ~ 2.2. ) thereby expressing a high strength by filling and produce a hydrate concrete micropores by ₂₎ and pozzolanic reaction.

Type II anhydrous gypsum is pulverized natural anhydrous gypsum with a fine powder of 50m ² / g or more through a pulverizer, composed of crystal structure and reactive in alkaline environment, calcium silicate hydrate (CSH) and A1 ₂ O ₃ It can react with to form Ettringite, a needle-like crystal in the concrete pores, and densify the structure to express high strength.

In this embodiment, the oil supply payment is amorphous calcium aluminate may be _{_{used;; (C 4 A 3 S}} 3CaO · 3Al 2 O 3 · CaSO 4) one or more _{_{(Amorphous 12CaO · 7Al 2 O 3}} C12A7), CSA.

Amorphous calcium aluminate is prepared by pulverizing a bauxite (Bauxite) with limestone and then fired in an electric furnace for (Limestone) diameter from 1 to more than 40m ² / g even powder as mineral amorphous prepared by rapid cooling with granulated forms of 2mm or less Preferably it is the range of 50-70m <^2> / g. It reacts with cement hydrate Ca (OH) ₂ and type II anhydrous gypsum rapidly to produce Ettringite and harden cement. However, when the amount is high, excessively large initial crystallites (Ettringite) are rapidly formed, resulting in very short condensation and no strength.

CSA is a mineral produced by calcining Bauxite, CaCO ₃ and CaSO ₄ in an electric furnace after cooling at room temperature. The powder level is 50m ² / g or more, preferably 60m ² / g ~ 80m ² / g, cement hydrate It reacts with Type II Natural Anhydrite Gypsum to rapidly produce Ettringite, thereby exhibiting fast hardness. Unlike the ACA, even if the amount of use is high, the setting time is not shortened drastically.

The hardening of the cemented carbide is closely related to the amount of heat of hydration. Hydration reaction of cement minerals shows the form of exothermic reaction, and the expression of initial strength depends on the amount of calorific value. In the present invention, one or more of potassium carbonate (potassium carbonate, K ₂ CO ₃ ) and calcium oxide (calcium oxide, CaO) may be used as a mineral heating material for improving the initial strength of concrete.

Potassium carbonate reacts with water to give off 0.2103 J / g of heat of dissolution, and calcium oxide reacts with water to give 1.0679 of heat of dissolution. However, calcium oxide absorbs water, which may cause calcium hydroxide (Ca (OH) ₂ ) to be doubled in volume. Therefore, an appropriate amount of heating material should be used.

As a coagulant, sodium silicate powder (Na ₂ SiO ₃ ; sodium silicate), tunnel white (with an Al ₂ O ₃ content of 80% or more) and lithium carbonate may be used. Sodium silicate powder reacts with CaO of cement to produce calcium silicate hydrate (CSH) and promotes cement condensation. Tunnel White is an amorphous white powder prepared by calcining bauxite in an electric furnace, containing 80% or more of Al ₂ O ₃ , ACA (Amorphous Calcium aluminate) and CSA (Calcium Sulfo) Promote the reaction of Ettringite formation of aluminate). Lithium carbonate (Li ₂ CO ₃ ; Lithum carbonate) is the raw material with the smallest atomic weight among alkali metals. It is a white monoclinic powder that rapidly increases the concentration of alkali ions in concrete and promotes condensation of concrete and shows super-speed hardness.

Super absorbency material (SAM) can be used as a stabilizer. This absorbs and retains surplus water during the initial mixing of concrete, and serves to gradually supply the moisture necessary for the curing process. Therefore, concrete can be supplied with sufficient moisture during curing, which can increase long-term durability and strength.

Tataric acid, sodium gluconate, or citric acid may be used as the retardant.

The high-performance susceptor may include one of polycarboxylate powder, naphthalin powder, melamine powder, and nigrin powder.

As described above, the present invention mixes ready-mixed concrete at the factory, and also mixes the polymer emulsion with the ready-mixed concrete at the factory, and transfers it to the road repair site using the ready-mixed vehicle. And road repair is carried out by mixing high-strength fastener additives using a shear mixer at the road repair site.

In the present invention, fluidity can be maintained even though the acrylic emulsion resin is included in the concrete composition. Therefore, the concrete composition according to the present invention can be transported over a long distance irrespective of the transport distance and time, and also a long distance transport using a sea transport or a pump car.

As mentioned above, being able to mix concrete in a factory has a very big advantage in terms of quality control of concrete. In other words, by manufacturing concrete in a KS-certified concrete production plant, it is possible to maintain the condition of raw materials, to quantitatively measure all materials, and to ensure that only concrete that meets the required quality can be shipped with the slump and air volume of the produced concrete. Can be.

In addition, the present invention has a great advantage in that it is possible to solve the economic problems caused by the use of cemented carbide in the existing road pavement repair concrete using a high-strength fastener additives.

The researchers tested the properties of the polymer-modified concrete composition.

First of all, an experiment was conducted to determine the effect of the mixing of each material of the high-strength fastness additive. FIG. 2 shows the composition and blending ratio of Sample 1 without mixing the high-strength additive material, Sample 2 to Sample 5 with only a few materials, and Sample 6 with all additives mixed. 3 shows physical property test results for the samples described in FIG. 2.

As shown in the table of Figure 2, six samples were made to test the physical properties for air volume, slump and strength.

Referring to Figure 2, the water-cement ratio and sand-aggregate ratio and high-performance water-reducing agent consumption is constant, and the performance of each formulation while replacing the high-strength filler with the navigator in the total cement amount and changing the high-strength filler composition ratio Confirmed.

In the case of Sample 1, general concrete was prepared using only cement, sand, gravel and water, and a high performance water reducing agent, and concrete was mixed at a normal ratio. As expected, in Sample 1, there was a problem in which fast hardness for road pavement repair was not expressed and a problem in which high strength was not expressed at the initial setting of condensation.

Samples 2 to 6 additionally used a fastener, a high strength material, a heating material, a coagulation accelerator, a stabilizer, and a retardant to show quickness and high strength. As a result, initial strength expression and initial high strength could be secured. .

Referring to the experimental results, the slump was performed according to KS F 2402, and Sample 1 showed a result of decreasing to 200 mm and 180 mm with time after the initial slump showed 210 mm. Sample 2 was used by navigating 120kg of cement amount as a fastener. While the initial slump was 180mm, it was lowered to 100mm or less after 15 minutes of age, and the change with time gradually decreased in samples 3 to 6 as well. As a result of the decrease in the change over time, it was confirmed that Samples 2 to 6 can secure the minimum workability for the construction of ultra-high speed concrete.

Most important in the present invention is age 4 hours compressive strength. In order to perform emergency repair construction of public roads, it is most important to express high strength at the beginning of construction. However, in the prior art, the only method was to manufacture superhard polymer concrete using the whole amount of superhard cement, but in the present invention, superhard polymer concrete was manufactured by substituting 20-40% of cement as an additive for the super hard carbide expression. can do.

Sample 1 was not cured at 4 hours of age as a concrete concrete, so it was impossible to measure the strength. After 1 day (24 hours), strength measurement was possible. In Samples 2 to 6, the composition of the high strength mixture was changed and mixed to measure the strength. When only the quick-setting material was added as in Sample 2, initial condensation proceeded too fast and the strength was relatively decreased. Samples 3 to 6 using high-strength material and heating material condensation accelerator showed strength. Is increasing. Sample 6 shows a result that the intensity of 4 hours is similar to that of Sample 5 and the intensity is higher after 1 day by using a stabilizer. Therefore, it was confirmed that the highest initial strength could be secured when all the materials of the high strength fastness additive were mixed.

In addition, the effect of the polymer emulsion was also tested.

In Figure 4 was mixed with samples 1 to 6 by varying the composition of the polymer emulsion in concrete. In other words, sample 1 was applied to general concrete formulation without using polymer emulsion and high strength fastener, and sample 2 was used to general acrylic emulsion with high strength fastener, and samples 3 to 6 were common acrylic emulsion with high strength fastener. The resin further mixed with the modifier used in the present invention.

5 shows the experimental results of the samples.

Sample 1 with normal concrete mixture shows the result that the slump is maintained for 60 minutes, while sample 2 using the general acrylic emulsion and the high-strength filler is rapidly cured after the initial slump measurement due to the influence of the high-strength filler. After 15 minutes, the slump is lowered to 115 mm. After that, condensation proceeded rapidly, and measurement was impossible at 30 minutes. Samples 3 to 6 improve the performance of the acrylic emulsion resin by using a modifier. The surfactant is adsorbed to the acrylic particles to prevent sudden aggregation between the particles when mixed with the cement, and the hydration reaction between the high strength filler and the cement is appropriately performed. I'm adjusting. Sample 3 shows the result that the slump is maintained for up to 60 minutes using only the surfactant, and Examples 3 to 5 also show a relatively better slump retention time than the sample 2 under the influence of the surfactant.

As a result of measuring the compressive strength, the sample 1 was unable to measure the strength because the condensation did not proceed in the initial 4 hours, and the strength could be measured after 1 day (24 hours). Sample 2 shows the result that the initial strength is greatly improved compared to the comparative example due to the effect of using a common acrylic resin and a high strength filler. Example 2, using only surfactant as the modifier, exhibits relatively low initial strength compared to Example 1. This may be due to the hydration retardation action of the high-strength filler with the use of surfactants. Examples 3 to 5 show the change in physical properties by using a modifier to prevent the decrease in strength due to the modification of the acrylic emulsion. Compared to Example 2, the change over time tended to be slightly larger, but the initial strength was increased, and the long-term strength was also excellent.

As a result of measuring the chlorine ion permeation performance, Sample 1 exhibited a high passing charge of 2,750 coulomb, while 300 ~ 500 coulomb was used in the composition using the high-strength filler and general acrylic emulsion (sample 2) or modified acrylic emulsion water quality (samples 3 to 6). By showing a very low amount of charge passing through it can be seen that the resistance to chlorine ions is very excellent.

As a result of measuring the adhesion strength, Sample 1 showed the adhesive strength of general concrete, while Samples 2 to 6 showed very improved adhesion strength.

In addition, the researchers fixed the amount of polymer emulsion and changed the composition of the high-strength fastener additives to prepare a sample to test the physical properties. 6 is a table showing the composition ratio of the sample, Figure 7 is a table showing the experimental results.

In sample 1 did not use a high-strength grade additive integrity, sample 2-6 shows the results of the physical properties of the concrete is increased from 63kg / m ³ up to 315kg / m ³ the high strength grade integrity additive amount.

Sample 1 has good retention performance due to the small amount of change in slump over time. However, the compressive strength expression is lowered, which is not suitable for emergency repair concrete, and the amount of charge passing through chlorine ions is lowered, but it is relatively higher than other samples. Indicated. This is believed to be the result of the high strength quenchable additive reacting with the cement hydrate, thereby producing a hydrate in the capillary pores of the concrete to form the concrete matrix more densely.

Samples 2 to 6 showed a tendency to increase the initial strength of 4 hours of age as the amount of high-strength fastener additives used increased, but samples 5 to 6 that used excessively increased strength decreased compared to samples 3 to 4 Results are shown. This is because, due to the reaction of the formation of the early quenchable hydrate, if the initial quenching amount is excessively high, the size of the quenchable hydrate is very large, and the formation and expansion of cement hydrate is hindered, so that the amount of capillary void is increased and the matrix of the concrete is loosely formed. The result can be said.

The amount of chlorine ion passing charge is lower than 1,000 coulomb due to the use of polymer emulsion at all composition ratios, but the amount of charge decreases to 270 coulomb as the amount of high-strength fastener additive is increased.

Based on the experimental results, the high-strength fastener additive in the present invention may be mixed in the range of 2.7 to 14% by weight throughout the polymer-modified concrete composition, preferably in the range of 5.5 to 8.5% by weight in terms of initial compressive strength. It was confirmed that.

In addition, the researchers fixed the amount of high-strength fastener additives and changed the composition of the polymer emulsion to form a sample. 8 is a table showing the composition ratio of the sample, Figure 9 is a table showing the experimental results.

Sample 1 did not use a polymer emulsion, and Samples 2 to 7 gradually increased the amount of polymer emulsion used. In the table of Figure 8, the high-performance susceptor was used by changing the amount of use to maintain a constant initial slump value of concrete.

Sample 1 without polymer emulsion showed rapid slump loss after initial slump expression, while compressive strength showed the highest result. Samples 2 to 7, in which the amount of polymer emulsion used was increased, gradually decreased as the amount used increased, and sample 7 maintained 115 mm at 60 minutes of age. However, the compressive strength has been shown to decrease the strength of the initial 4 hours as the amount of the polymer emulsion increases. This can be said to be the result of delayed hydration reaction of the polymer emulsion. Therefore, it is confirmed that the amount of use needs to be properly adjusted according to the site conditions and working hours.

As described above, the polymer-modified concrete composition according to the present invention prepares the ready-mixed concrete at the factory and transfers the concrete composition to the construction site after incorporating the polymer emulsion. On the road repair site, high-strength quenchable additives are mixed at high speed in the concrete composition transferred from the plant in the mixing device.

Therefore, compared with the conventional road pavement concrete composition, it is possible to manufacture a large amount of polymer modified concrete within the same time, the construction speed is improved, and there is no need to prepare the raw materials for the concrete production site have.

In addition, there is an advantage that the quality of concrete can be improved by minimizing the change of raw materials by using ready mixed concrete.

First of all, by not using cemented carbide for the production of concrete, there is an advantage that the economy is significantly improved compared to the existing technology.

For reference, in the tables of FIGS. 2, 4, 6, and 8, data where no data is displayed means that the material is not added. In the tables of FIGS. 3, 5, 7, and 9, the parts not checked in the time-varying part are all cases where the time-varying change is 100 mm or less or measurement is impossible. The part not written in the strength part means that hardening is not performed.

Claims

A polymer modified concrete composition for repairing pavement,

A polymer modified concrete composition comprising concrete and a polymer emulsion and a fastener additive.
The method of claim 1,

The polymer emulsion polymer modified concrete composition, characterized in that it comprises an amine strength promoter.
The method of claim 2,

The amine strength promoter is a polymer-modified concrete composition, characterized in that it comprises ethanolamine.
The method of claim 2,

The amine strength promoter is a polymer-modified concrete composition, characterized in that it comprises isopropanolamine.
The method of claim 1,

The polymer emulsion,

75 to 97.5% by weight of acrylic emulsion resin, 0.05% by weight of polymer surfactant, 0.05 to 5% by weight of glycerin, 0.05 to 5% by weight of amine strength accelerator, 0.05 to 5% by weight of aluminum hydration accelerator, 0.05 to 5% by weight of reducing agent Polymer modified concrete composition, characterized in that mixed in proportion.
The method of claim 1,

The acrylic emulsion resin is a polymer modified concrete composition, characterized in that mixed in the range of 1 to 15% by weight compared to the concrete.
The method of claim 1,

The quenchable additive is a polymer-modified concrete composition, characterized in that it comprises precipitated silica.
The method of claim 1,

The quick setting additive,

10 to 50% by weight of high strength material, 0.05 to 5% by weight of condensation accelerator, 30 to 80% by weight of fastener, 0.05 to 5% by weight of heating material, 0.05 to 5% by weight of stabilizer, 0.05 to 3% by weight of delay material, 0.05 water reducing agent Polymer modified concrete composition, characterized in that the mixing at a ratio of ~ 2% by weight.
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 to a repair site, followed by mixing a quick additive in the repair site; And

Installing and curing the polymer-modified concrete composition on the cut pavement surface: road pavement repair method comprising the.
The method of claim 9,

The polymer modified concrete composition is a road pavement repair method, characterized in that the polymer modified concrete composition described in any one of claims 1 to 8.