WO2010030048A1

WO2010030048A1 - The polymer concrete composition containing atomizing steel slag and the manufacturing method thereof

Info

Publication number: WO2010030048A1
Application number: PCT/KR2008/005343
Authority: WO
Inventors: Jin-Man Kim; Eui-Hwan Hwang; Eun-Gu Kwak; Jae-Won Kim
Original assignee: Kongju National University Industry-University Cooperation Foundation
Priority date: 2008-09-10
Filing date: 2008-09-10
Publication date: 2010-03-18
Also published as: JP2011524321A; CN102264664A; JP4825949B2

Abstract

Disclosed is a polymer concrete composition containing atomized steel slag and a manu¬ facturing method thereof. In the polymer concrete composition including an aggregate and a thermosetting resin for binding the aggregate, a fine and/or coarse aggregate of the aggregate are replaced with atomized steel slag which has a high solid volume and a high density and is spherical in shape, thereby enhancing fluidity of the polymer concrete composition, reducing the amount of the thermosetting resin and increasing the amount of the aggregate per unit volume, consequently increasing engineering properties of polymer concrete products including com¬ pressive strength and fluidity and generating economic benefits.

Description

THE POLYMER CONCRETE COMPOSITION CONTAINING ATOMIZING STEEL SLAG AND THE MANUFACTURING

METHOD THEREOF

Technical Field

[1] The present invention relates to a polymer concrete composition containing atomized steel slag and a manufacturing method thereof, and more particularly, to a polymer concrete composition containing atomized steel slag in which atomized steel slag is contained as an aggregate in a polymer concrete composition including a thermosetting resin, thus increasing fluidity of the polymer concrete composition, and also, the shape of the atomized steel slag is almost spherical, thus reducing the amount of the thermosetting resin, ultimately generating economic benefits and increasing compressive and bending strength of concrete products, and to a method of manufacturing the same. Background Art

[2] Generally, concrete for use in construction and engineering, which is composed mainly of cement, water and aggregate, and a further admixture if necessary, is poured on-site or is applied in a manner such that, in the case where precasting is required, the concrete components are mixed while the ratio of water and cement is varied, subjected to a forming process using vibration pressing and centrifugation, and then cured, thus obtaining a concrete product unit. However, this type of common concrete is problematic in that reinforcing rods are weakened in durability because of corrosion, neutralization, damage from sea wind and water, etc. In order to solve this phenomenon, methods of coating the reinforcing rods with a chemical resin such as epoxy resin, urethane, silicone, unsaturated polyester and so on or with a paint are employed, but have drawbacks related to durability, economic benefits and adhesion. Specifically, Portland cement concrete, which is a typical construction material, has advantages in terms of economic benefits and structural properties, but suffers because the binder is cement hydrate which causes slow hardening, low tensile strength, large dry shrinkage, and poor chemical resistance.

[3] With the goal of solving such problems, not cement but liquid resin such as a thermosetting or thermoplastic resin is used as a binder for binding aggregate in the manufacturing of concrete, thus producing polymer concrete. This polymer concrete has water resistance, durability, chemical resistance, bending/tensile/compressive strength, and shock resistance superior to those of the aforementioned cement concrete. The polymer concrete has superior performance in this way, but is disadvantageous because it is made of an expensive organic polymer aggregate and a filler, thus having lower economic benefits compared to the cement concrete. Consequently, the polymer concrete cannot but have limited end uses.

[4] Further, the steel industry, which consumes large amounts of materials and energy, creates a great deal of steel slag as a by-product of shipmaking, steelmaking, rolling, and other complicated production processes. Such steel slag is industrial waste generated by refining a steelmaking material such as pig iron or scrap iron in a converter furnace or an electric arc furnace. In the case where this slag is disposed without recycling, various environmental problems due to dust scattering or leachate water are caused, and also a large-scale disposal plant should be constructed, thus negating economic benefits. Hence, thorough research into uses of such slag has been made. The steel slag is lighter than iron and thus is separatable due to the difference in specific gravity, and also contains almost no heavy metals and thus is minimally harmful to the environment, and therefore studies of uses of such slag as an industrial construction material are actively conducted. However, because the steel slag includes free calcium oxide (f-CaO) therein, it may expand in volume due to a chemical reaction caused by contact with water. So, in the case where such steel slag is used for road pavement or concrete, it may cause cracks. Thus, there have been devised methods of subjecting the steel slag to a post process such as aging so that it can be used in a chemical stable state, but the reliability thereof is not so high and actual applications thereof are limited.

[5] Recently, methods of rapidly cooling the steel slag in a molten state using high speed air so as to control the amount of produced free calcium oxide (f-CaO) have been developed. Because the steel slag thus obtained is spherical in shape, it is referred to as atomized steel slag (ASS), and also the steel slag is obtained through rapid cooling and thus is referred to as rapidly cooled steel slag (RCSS). Such atomized steel slag is in low danger of expansion breakdown due to free calcium oxide. Further, because the shape of the atomized steel slag is almost spherical like that of a fine aggregate, in the case where such slag is used as a construction material for concrete, a ball bearing effect may be exhibited, thus increasing fluidity. However, the atomized steel slag has a density higher than the other materials, and thus may result in segregation of materials. Ultimately, it is difficult to apply the atomized steel slag in the field other than in concrete for specific purposes.

[6] Korean Unexamined Patent Publication No. 10-2007-0095706 (title: superlight or super high weight polymer concrete composition with high strength, method of preparing the same, and method of manufacturing polymer concrete product using the same) discloses that steel slag rendered into a powdered state through pulverization and crushing is used as a powder material, atomized steel slag is used as a substitute for part of an aggregate, and iron and steel fibers are used to achieve an extremely high weight, thus manufacturing the polymer concrete composition, but the strength of the resulting product is undesirably below that of common polymer concrete. Disclosure of Invention

Technical Problem

[7] Accordingly, the present invention has been made keeping in mind the above problems occurring in the related art, and the present invention provides a polymer concrete composition containing atomized steel slag and a manufacturing method thereof, in which atomized steel slag is used as a substitute for a fine and/or coarse aggregate of conventional polymer concrete, thereby recycling the steel slag which is industrial waste, reducing the use of an expensive polymer concrete resin to thereby generate economic benefits, and improving quality and workability compared to the conventional polymer concrete. Technical Solution

[8] An aspect of the present invention provides a polymer concrete composition including an aggregate and a thermosetting resin for binding the aggregate, wherein part or all of a fine aggregate of the aggregate is replaced with atomized steel slag.

[9] Another aspect of the present invention provides a polymer concrete composition including an aggregate and a thermosetting resin for binding the aggregate, wherein both a coarse aggregate and a fine aggregate of the aggregate are replaced with atomized steel slag.

[10] The atomized steel slag is rapidly cooled steel slag obtained by introducing steel slag in a liquid phase resulting from a steelmaking process of an iron mill into a pot, allowing the steel slag to flow to a zone where water-mixed high pressure gas is sprayed so that the steel slag receives kinetic energy of the water-mixed high pressure gas and is divided into numerous fine particles having a spherical shape due to surface tension, and rapidly cooling the fine particles using water or air.

[H] The shape of the atomized steel slag thus obtained is shown in FIG. 1, and the physical properties thereof are given in Table 1 below. [12] Table 1 [Table 1] [Table ] Physical Properties of Atomized Steel Slag and Sand

[13] The density of the atomized steel slag is 3.54, which is higher than that of sand. Also, because the shape of the atomized steel slag is almost spherical, the solid volume thereof is 62.7% which is about 7% higher than that of sand.

[14] Hence, because the shape of the atomized steel slag is almost spherical, when this slag is recycled as a fine aggregate and/or a coarse aggregate for a concrete composition, fluidity and compressive strength of the concrete are enhanced. Compared to the fine aggregate and/or the coarse aggregate of conventional polymer concrete, the atomized steel slag has a higher solid volume, so that the amount of the thermosetting resin to be added is reduced, thus generating economic benefits.

[15] Specifically, the polymer concrete composition according to the present invention using the atomized steel slag as a substitute for all of the fine aggregate includes 10-30 vol% of a thermosetting resin, 30-50 vol% of a coarse aggregate, 15-25 vol% of atomized steel slag, 2-6 vol% of a shrinkage reducing agent, 10-20 vol% of a filler and 0.1-0.5 vol% of an initiator.

[16] The thermosetting resin may be epoxy resin or urethane resin, but it is desirable to use unsaturated polyester resin. The thermosetting resin may be used in an amount of 10-30 vol% based on the total amount of the polymer concrete composition. If the amount of the thermosetting resin is less than 10 vol%, it is difficult to mix the components of polymer concrete. In contrast, if the amount thereof exceeds 30 vol%, the deformation and material segregation of polymer concrete may occur. The unsaturated polyester resin is a resin which is obtained by subjecting, as an essential ingredient, an α-β unsaturated polybasic acid such as maleic anhydride or an acid anhydride, optionally together with a saturated polybasic acid such as phthalic anhydride, to esterification with a polyvalent alcohol such as propyleneglycol, thus preparing unsaturated polyester which is then dissolved in a monomer polymerizable with the unsaturated polyester, for example, styrene. The hardening reaction of the unsaturated polyester resin occurs through radical polymerization which consists of steps of decomposition, initiation, propagation, termination, chain transfer and then hardening.

[17] The coarse aggregate is used in a dry state in which water content is 0.05% or less. A typical example of the coarse aggregate includes but is not limited to river gravel for use in concrete, and the coarse aggregate may be used in an amount of 30-50 vol% based on the total amount of the polymer concrete composition. If the amount of the coarse aggregate is less than 30 vol%, the amount of the polymer resin may be undesirably increased. In contrast, if the amount thereof exceeds 50 vol%, the filling rate decreases and thus the strength of the concrete is reduced.

[18] The atomized steel slag may have a density(g/cnf) of 3.5-3.6, a solid volume of

60-70%, and a particle size of 0.1-5 mm in order to enhance the strength thanks to having the tightest packing and to reduce the amount of the thermosetting resin. The atomized steel slag may be used in an amount of 15-25 vol% based on the total amount of the polymer concrete composition. If the amount of the atomized steel slag is less than 15 vol%, the physical properties thereof when used as a substitute for a natural aggregate are very unsatisfactory. In contrast, if the amount thereof exceeds 25 vol%, the amount of the polymer resin is increased.

[19] The initiator plays a role as a catalyst initiating the poly condensation of the thermosetting resin, for example, the unsaturated polyester resin, and an example thereof includes methyl ethyl ketone peroxide. The initiator may be used in an amount of 0.1-0.5 vol% based on the total amount of the polymer concrete composition. If the amount of the initiator is less than 0.1 vol%, a period of time required to perform a hardening process is lengthened, undesirably reducing productivity. In contrast, if the amount thereof exceeds 0.5 vol%, a period of time required to perform a hardening process is shortened and thus a minimum process time necessary for the production process including concrete pouring becomes inadequate.

[20] The shrinkage reducing agent, an example of which includes polystyrene resin, is used to prevent the polymer concrete from cracking as a result of excessive volume reduction of the thermosetting resin which may reduce its volume upon hardening due to the polymerization occurring in the course of hardening the polymer concrete, and to maintain dimensional stability and control excessive shrinkage. The shrinkage reducing agent may be used in an amount of 2-6 vol% based on the total amount of the polymer concrete composition. If the amount of the shrinkage reducing agent is less than 2 vol%, excessive volume reduction of the thermosetting resin may be caused. In contrast, if the amount thereof exceeds 6 vol%, the strength may decrease. Accordingly, the thermosetting resin for example the unsaturated polyester resin and the shrinkage reducing agent for example the polystyrene resin may be mixed at a volume ratio of 4:1.

[21] The filler is an inert material used to reduce the amount of the thermosetting resin and to increase viscosity, strength and durability. Examples of the filler include Ground calcium carbonate (CaCO₃) having a particle size of 1-30 μm, silica powder, and fly ash. The filler may be used in an amount of 10-20 vol% based on the total amount of the polymer concrete composition. If the amount of the filler is less than 10 vol%, the adhesive force of the polymer concrete is weakened attributable to a reduced viscosity thereof. In contrast, if the amount thereof exceeds 20 vol%, desired filling properties and fluidity are not achieved.

[22] Also, the polymer concrete composition according to the present invention using the atomized steel slag as a substitute for part of the fine aggregate includes 10-30 vol% of a thermosetting resin, 30-50 vol% of a coarse aggregate, 4.75-15.75 vol% of a fine aggregate, 4.75-15.75 vol% of atomized steel slag, 2-6 vol% of a shrinkage reducing agent, 10-20 vol% of a filler and 0.1-0.5 vol% of an initiator.

[23] The thermosetting resin may be epoxy resin or urethane resin, but it is desirable to use unsaturated polyester resin. The thermosetting resin may be used in an amount of 10-30 vol% based on the total amount of the polymer concrete composition. If the amount of the thermosetting resin is less than 10 vol%, it is difficult to mix the components of polymer concrete. In contrast, if the amount thereof exceeds 30 vol%, the deformation and material segregation of polymer concrete may occur. The unsaturated polyester resin is a resin which is obtained by subjecting, as an essential ingredient, an α-β unsaturated polybasic acid such as maleic anhydride or an acid anhydride, optionally together with a saturated polybasic acid such as phthalic anhydride, to esterification with a polyvalent alcohol such as propyleneglycol, thus preparing unsaturated polyester which is then dissolved in a monomer polymerizable with the unsaturated polyester, for example, styrene. The hardening reaction of the unsaturated polyester resin occurs through radical polymerization which consists of the steps of decomposition, initiation, propagation, termination, chain transfer and then hardening.

[24] The coarse aggregate is used in a dry state in which water content is 0.05% or less. A typical example of the coarse aggregate includes but is not limited to river gravel for use in concrete, and the coarse aggregate may be used in an amount of 30-50 vol% based on the total amount of the polymer concrete composition. If the amount of the coarse aggregate is less than 30 vol%, the amount of the polymer resin may be undesirably increased. In contrast, if the amount thereof exceeds 50 vol%, the filling rate decreases and thus the strength is reduced.

[25] The fine aggregate is used in a dry state in which water content is 1% or less. A typical example of the fine aggregate includes but is not limited to river gravel for use in concrete, and the fine aggregate may be used in an amount of 4.75-15.75 vol% based on the total amount of the polymer concrete composition. If the amount of the fine aggregate is less than 4.75 vol%, the strength of the polymer concrete may be undesirably reduced. In contrast, if the amount thereof exceeds 15.75 vol%, the fluidity of the polymer concrete is reduced, undesirably lowering workability.

[26] The atomized steel slag may have a density(g/cnf) of 3.5-3.6, a solid volume of

60-70%, and a particle size of 0.1-5 mm in order to enhance the strength thanks to having the tightest packing and reduce the amount of thermosetting resin. The atomized steel slag may be used in an amount of 4.75-15.75 vol% based on the total amount of the polymer concrete composition. If the amount of the atomized steel slag is less than 4.75 vol%, the strength of the polymer concrete may be undesirably reduced. In contrast, if the amount thereof exceeds 15.75 vol%, the fluidity of the polymer concrete is reduced, undesirably lowering workability. [27] The initiator functions as a catalyst initiating the polycondensation of the thermosetting resin, for example, the unsaturated polyester resin, and an example thereof includes methyl ethyl ketone peroxide. The initiator may be used in an amount of 0.1-0.5 vol% based on the total amount of the polymer concrete composition. If the amount of the initiator is less than 0.1 vol%, a period of time required to perform a hardening process is lengthened, undesirably reducing productivity. In contrast, if the amount thereof exceeds 0.5 vol%, a period of time required to perform a hardening process is shortened and thus a minimum process time necessary for the production process including concrete pouring becomes inadequate.

[28] The shrinkage reducing agent, an example of which includes polystyrene resin, is used to prevent the polymer concrete from cracking as a result of excessive volume reduction of the thermosetting resin which may reduce its volume upon hardening due to the polymerization occurring in the course of hardening the polymer concrete, and to maintain dimensional stability and control excessive shrinkage. The shrinkage reducing agent may be used in an amount of 2-6 vol% based on the total amount of the polymer concrete composition. If the amount of the shrinkage reducing agent is less than 2 vol%, excessive volume reduction of the thermosetting resin may be caused. In contrast, if the amount thereof exceeds 6 vol%, the strength may decrease. Accordingly, the thermosetting resin for example the unsaturated polyester resin and the shrinkage reducing agent for example the polystyrene resin may be mixed at a volume ratio of 4:1.

[29] The filler is an inert material used to reduce the amount of the thermosetting resin and to increase viscosity, strength and durability. Examples of the filler include Ground calcium carbonate (CaCO₃) having a particle size of 1-30 μm, silica powder, and fly ash. The filler may be used in an amount of 10-20 vol% based on the total amount of the polymer concrete composition. If the amount of the filler is less than 10 vol%, the adhesive force of the polymer concrete is weakened attributable to a reduced viscosity thereof. In contrast, if the amount thereof exceeds 20 vol%, desired filling properties and fluidity are not achieved.

[30] Also, the polymer concrete composition according to the present invention using the atomized steel slag as a substitute for both the coarse aggregate and the fine aggregate includes 4-10 vol% of a thermosetting resin, 45-75 vol% of atomized steel slag, 0.85-2 vol% of a shrinkage reducing agent, 15-20 vol% of a filler and 0.13-0.16 vol% of an initiator.

[31] The thermosetting resin may be epoxy resin or urethane resin, but it is desirable to use unsaturated polyester resin. The thermosetting resin may be used in an amount of 4-10 vol% based on the total amount of the polymer concrete composition. If the amount of the thermosetting resin is less than 4 vol%, it is difficult to mix the components of polymer concrete. In contrast, if the amount thereof exceeds 10 vol%, the deformation and material segregation of polymer concrete may occur. The unsaturated polyester resin is a resin which is obtained by subjecting, as an essential ingredient, an α-β unsaturated polybasic acid such as maleic anhydride or an acid anhydride, optionally together with a saturated polybasic acid such as phthalic anhydride, to esterification with a polyvalent alcohol such as propyleneglycol, thus preparing unsaturated polyester which is then dissolved in a monomer polymerizable with the unsaturated polyester, for example, styrene. The hardening reaction of the unsaturated polyester resin occurs through radical polymerization which consists of steps of decomposition, initiation, propagation, termination, chain transfer and then hardening.

[32] The atomized steel slag may have a density(g/cnf) of 3.5-3.6, a solid volume of

60-70%, and a particle size of 0.1-5 mm in order to enhance the strength thanks to having the tightest packing and to reduce the amount of thermosetting resin. The atomized steel slag may be used in an amount of 45-75 vol% based on the total amount of the polymer concrete composition. If the amount of the atomized steel slag is less than 45 vol%, the amount of the polymer resin is excessively increased, thus negating economic benefits. In contrast, if the amount thereof exceeds 75 vol%, the amount of the polymer resin is reduced, undesirably cracking the polymer concrete.

[33] The initiator functions as a catalyst initiating the polycondensation of the thermosetting resin, for example, the unsaturated polyester resin, and an example thereof includes methyl ethyl ketone peroxide. The initiator may be used in an amount of 0.13-0.16 vol% based on the total amount of the polymer concrete composition. If the amount of the initiator is less than 0.13 vol%, a period of time required to perform a hardening process is lengthened, undesirably reducing productivity. In contrast, if the amount thereof exceeds 0.16 vol%, a period of time required to perform a hardening process is shortened and thus a minimum process time necessary for the production process including concrete pouring becomes inadequate.

[34] The shrinkage reducing agent, an example of which includes polystyrene resin, is used to prevent the polymer concrete from cracking as a result of excessive volume reduction of the thermosetting resin which may reduce its volume upon hardening due to the polymerization occurring in the course of hardening the polymer concrete, and to maintain dimensional stability and control excessive shrinkage. The shrinkage reducing agent may be used in an amount of 0.85-2 vol% based on the total amount of the polymer concrete composition. If the amount of the shrinkage reducing agent is less than 0.85 vol%, excessive volume reduction of the thermosetting resin may ensue. In contrast, if the amount thereof exceeds 2 vol%, the strength may decrease. Accordingly, the thermosetting resin for example the unsaturated polyester resin and the shrinkage reducing agent for example the polystyrene resin may be mixed at a volume ratio of 4:1.

[35] The filler is an inert material used to reduce the amount of the thermosetting resin, and to increase viscosity, strength and durability. Examples of the filler include Ground calcium carbonate (CaCO₃) having a particle size of 1-30 μm, silica powder, and fly ash. The filler may be used in an amount of 15-20 vol% based on the total amount of the polymer concrete composition. If the amount of the filler is less than 15 vol%, the adhesive force of the polymer concrete is weakened attributable to a reduced viscosity thereof. In contrast, if the amount thereof exceeds 20 vol%, desired filling properties and fluidity are not achieved.

[36] In addition, a further aspect of the present invention provides a method of manufacturing the polymer concrete composition using atomized steel slag as a substitute for all of a fine aggregate, including a) mixing a thermosetting resin with a shrinkage reducing agent, b) mixing a filler, a coarse aggregate, and atomized steel slag, c) mixing the resin mixture (which is referred to as 'polymer resin') obtained in a) with the powder mixture obtained in b), and d) adding an initiator to the mixture obtained in c).

[37] Also, yet another aspect of the present invention provides a method of manufacturing the polymer concrete composition using atomized steel slag as a substitute for part of a fine aggregate, including a) mixing a thermosetting resin with a shrinkage reducing agent, b) mixing a filler, a fine aggregate, a coarse aggregate and atomized steel slag, c) mixing the polymer resin obtained in a) with the powder mixture obtained in b), and d) adding an initiator to the mixture obtained in c).

[38] Also, still another aspect of the present invention provides a method of manufacturing the polymer concrete composition using atomized steel slag as a substitute for both a coarse aggregate and a fine aggregate, including a) mixing a thermosetting resin with a shrinkage reducing agent, b) mixing a filler and atomized steel slag, c) mixing the polymer resin obtained in a) with the powder mixture obtained in b), and d) adding an initiator to the mixture obtained in c).

[39] As such, in a), the thermosetting resin may be an unsaturated polyester resin, the shrinkage reducing agent may be a polystyrene resin, and the unsaturated polyester resin and the polystyrene resin may be mixed at a volume ratio of 4: 1. In b), the atomized steel slag may have a density(g/cnf) of 3.4-3.6, a solid volume of 60-70%, and a particle size of 0.3-5 mm, and the filler may be Ground calcium carbonate. In d), the initiator may be methyl ethyl ketone peroxide.

Advantageous Effects

[40] According to the present invention, the polymer concrete composition includes atomized steel slag in lieu of a conventional fine aggregate and/or a conventional coarse aggregate. Thereby, the steel slag which is industrial slag is recycled, and thus polymer concrete is environmentally friendly. Further, because the shape of the steel slag is spherical, the fluidity of polymer concrete is improved and thus the amount of thermosetting resin is reduced, thereby generating economic benefits. As well, compressive strength is enhanced, and the density is increased. In the case where the polymer concrete composition is used for repairing structures including culverts or drainpipes, the structures can be prevented from coming off.

[41] Also, in the case where the atomized steel slag is used in lieu of the conventional fine aggregate and/or the conventional coarse aggregate in the polymer concrete composition, a period of time required to pour concrete so as to form a concrete product can be reduced, and a vibrating compaction time can be reduced thanks to a high solid volume of the atomized steel slag, thus exhibiting superior construction effects. Brief Description of Drawings

[42] FIG. 1 is a photograph showing atomized steel slag.

[43] FIG. 2 is a graph showing the change in density of polymer concrete depending on the substitution rate of atomized steel slag.

[44] FIG. 3 is a graph showing the change in slump of polymer concrete depending on the substitution rate of atomized steel slag.

[45] FIG. 4 is a graph showing the change in compressive strength of polymer concrete depending on the substitution rate of atomized steel slag.

[46] FIG. 5 is a graph showing the change in slump of polymer concrete depending on the substitution rate of atomized steel slag and the amount of thermosetting resin.

[47] FIG. 6 is a graph showing the change in fluidity of polymer concrete depending on the substitution rate of atomized steel slag and the amount of thermosetting resin according to an L-box test.

[48] FIG. 7 is a graph showing the change in fluidity of polymer concrete depending on the substitution rate of atomized steel slag and the amount of thermosetting resin according to a Vebe test. Best Mode for Carrying out the Invention

[49] A better understanding of the present invention may be obtained through the following examples, which are set forth to illustrate but are not to be construed as limiting the present invention.

[50] <Example 1>

[51] Polymer concrete products according to the present invention were manufactured using atomized steel slag as a substitute for 25% of a conventional fine aggregate while varying the amount of unsaturated polyester resin. [52] 1-1 When the amount of polymer resin is 15 vol%

[53] a) 12 vol% of an unsaturated polyester resin was mixed with 3 vol% of a polystyrene resin using a forced type mixer.

[54] b) Separately, 16.85 vol% of Ground calcium carbonate, 47 vol% of a coarse aggregate, 15.75 vol% of a fine aggregate and 5.25 vol% of atomized steel slag were mixed together using a forced type mixer.

[55] c) The polymer resin obtained in step a) and the powder mixture obtained in step b) were mixed together, added with 0.15 vol% of methyl ethyl ketone peroxide, and then sufficiently mixed using a forced type mixer, thus manufacturing a polymer concrete composition including atomized steel slag.

[56] d) The polymer concrete composition thus manufactured was stirred for 5 min and then loaded into a mold.

[57] e) The polymer concrete composition was subjected to vibrating compaction for 4 min, naturally cured at room temperature for 60-90 min, and then released from the mold shrunk by hydraulic pressure.

[58] f) The resulting product was naturally cured at room temperature and thus hardened, thereby manufacturing a polymer concrete product including atomized steel slag.

[59] 1-2 When the amount of polymer resin is 17 vol%

[60] A polymer concrete product was manufactured in the same manner as in Example

1-1, with the exception that 13.6 vol% of the unsaturated polyester resin, 3.4 vol% of the polystyrene resin, 46 vol% of the coarse aggregate, 15.37 vol% of the fine aggregate, 5.13 vol% of the atomized steel slag, 16.33 vol% of the Ground calcium carbonate, and 0.17 vol% of the methyl ethyl ketone peroxide were used.

[61] 1-3 When the amount of polymer resin is 19 vol%

[62] A polymer concrete product was manufactured in the same manner as in Example

1-1, with the exception that 15.2 vol% of the unsaturated polyester resin, 3.8 vol% of the polystyrene resin, 45 vol% of the coarse aggregate, 15 vol% of the fine aggregate, 5 vol% of the atomized steel slag, 15.81 vol% of the Ground calcium carbonate, and 0.19 vol% of the methyl ethyl ketone peroxide were used.

[63] 1-4 When the amount of polymer resin is 21 vol%

[64] A polymer concrete product was manufactured in the same manner as in Example

1-1, with the exception that 16.8 vol% of the unsaturated polyester resin, 4.2 vol% of the polystyrene resin, 44 vol% of the coarse aggregate, 14.62 vol% of the fine aggregate, 4.86 vol% of the atomized steel slag, 15.29 vol% of the Ground calcium carbonate, and 0.21 vol% of the methyl ethyl ketone peroxide were used.

[65] 1-5 When the amount of polymer resin is 23 vol%

[66] A polymer concrete product was manufactured in the same manner as in Example

1-1, with the exception that 18.4 vol% of the unsaturated polyester resin, 4.6 vol% of the polystyrene resin, 43 vol% of the coarse aggregate, 14.25 vol% of the fine aggregate, 4.75 vol% of the atomized steel slag, 14.77 vol% of the Ground calcium carbonate, and 0.23 vol% of the methyl ethyl ketone peroxide were used.

[67]

[68] <Example 2>

[69] Polymer concrete products according to the present invention were manufactured using atomized steel slag as a substitute for 50% of a conventional fine aggregate while varying the amount of unsaturated polyester resin.

[70] 2-1 When the amount of polymer resin is 15 vol%

[71] A polymer concrete product was manufactured in the same manner as in Example

1-1, with the exception that 12 vol% of the unsaturated polyester resin, 3 vol% of the polystyrene resin, 47 vol% of the coarse aggregate, 10.05 vol% of the fine aggregate, 10.05 vol% of the atomized steel slag, 16.85 vol% of the Ground calcium carbonate, and 0.15 vol% of the methyl ethyl ketone peroxide were used.

[72] 2-2 When the amount of polymer resin is 17 vol%

[73] A polymer concrete product was manufactured in the same manner as in Example

1-1, with the exception that 13.6 vol% of the unsaturated polyester resin, 3.4 vol% of the polystyrene resin, 46 vol% of the coarse aggregate, 10.25 vol% of the fine aggregate, 10.25 vol% of the atomized steel slag, 16.33 vol% of the Ground calcium carbonate, and 0.17 vol% of the methyl ethyl ketone peroxide were used.

[74] 2-3 When the amount of polymer resin is 19 vol%

[75] A polymer concrete product was manufactured in the same manner as in Example

1-1, with the exception that 15.2 vol% of the unsaturated polyester resin, 3.8 vol% of the polystyrene resin, 45 vol% of the coarse aggregate, 10 vol% of the fine aggregate, 10 vol% of the atomized steel slag, 15.81 vol% of the Ground calcium carbonate, and 0.19 vol% of the methyl ethyl ketone peroxide were used.

[76] 2-4 When the amount of polymer resin is 21 vol%

[77] A polymer concrete product was manufactured in the same manner as in Example

1-1, with the exception that 16.8 vol% of the unsaturated polyester resin, 4.2 vol% of the polystyrene resin, 44 vol% of the coarse aggregate, 9.75 vol% of the fine aggregate, 9.75 vol% of the atomized steel slag, 15.29 vol% of the Ground calcium carbonate, and 0.21 vol% of the methyl ethyl ketone peroxide were used.

[78] 2-5 When the amount of polymer resin is 23 vol%

[79] A polymer concrete product was manufactured in the same manner as in Example

1-1, with the exception that 18.4 vol% of the unsaturated polyester resin, 4.6 vol% of the polystyrene resin, 43 vol% of the coarse aggregate, 9.5 vol% of the fine aggregate, 9.5 vol% of the atomized steel slag, 14.77 vol% of the Ground calcium carbonate, and 0.23 vol% of the methyl ethyl ketone peroxide were used. [80]

[81] <Example 3>

[82] Polymer concrete products according to the present invention were manufactured using atomized steel slag as a substitute for 75% of a conventional fine aggregate while varying the amount of unsaturated polyester resin.

[83] 3-1 When the amount of polymer resin is 15 vol%

[84] A polymer concrete product was manufactured in the same manner as in Example

1-1, with the exception that 12 vol% of the unsaturated polyester resin, 3 vol% of the polystyrene resin, 47 vol% of the coarse aggregate, 5.25 vol% of the fine aggregate, 15.75 vol% of the atomized steel slag, 16.85 vol% of the Ground calcium carbonate, and 0.15 vol% of the methyl ethyl ketone peroxide were used.

[85] 3-2 When the amount of polymer resin is 17 vol%

[86] A polymer concrete product was manufactured in the same manner as in Example

1-1, with the exception that 13.6 vol% of the unsaturated polyester resin, 3.4 vol% of the polystyrene resin, 46 vol% of the coarse aggregate, 5.13 vol% of the fine aggregate, 15.37 vol% of the atomized steel slag, 16.33 vol% of the Ground calcium carbonate, and 0.17 vol% of the methyl ethyl ketone peroxide were used.

[87] 3-3 When the amount of polymer resin is 19 vol%

[88] A polymer concrete product was manufactured in the same manner as in Example

1-1, with the exception that 15.2 vol% of the unsaturated polyester resin, 3.8 vol% of the polystyrene resin, 45 vol% of the coarse aggregate, 5 vol% of the fine aggregate, 15 vol% of the atomized steel slag, 15.81 vol% of the Ground calcium carbonate, and 0.19 vol% of the methyl ethyl ketone peroxide were used.

[89] 3-4 When the amount of polymer resin is 21 vol%

[90] A polymer concrete product was manufactured in the same manner as in Example

1-1, with the exception that 16.8 vol% of the unsaturated polyester resin, 4.2 vol% of the polystyrene resin, 44 vol% of the coarse aggregate, 4.86 vol% of the fine aggregate, 14.62 vol% of the atomized steel slag, 15.29 vol% of the Ground calcium carbonate, and 0.21 vol% of the methyl ethyl ketone peroxide were used.

[91] 3-5 When the amount of polymer resin is 23 vol%

[92] A polymer concrete product was manufactured in the same manner as in Example

1-1, with the exception that 18.4 vol% of the unsaturated polyester resin, 4.6 vol% of the polystyrene resin, 43 vol% of the coarse aggregate, 4.75 vol% of the fine aggregate, 14.25 vol% of the atomized steel slag, 14.77 vol% of the Ground calcium carbonate, and 0.23 vol% of the methyl ethyl ketone peroxide were used.

[93]

[94] <Example 4>

[95] Polymer concrete products according to the present invention were manufactured using atomized steel slag as a substitute for all of a conventional fine aggregate while varying the amount of unsaturated polyester resin. [96] 4-1 When the amount of polymer resin is 15 vol%

[97] a) 12 vol% of an unsaturated polyester resin was mixed with 3 vol% of a polystyrene resin using a forced type mixer. [98] b) Separately, 16.85 vol% of Ground calcium carbonate, 47 vol% of a coarse aggregate, and 21 vol% of atomized steel slag were mixed together using a forced type mixer. [99] c) The polymer resin obtained in step a) and the powder mixture obtained in step b) were mixed together, added with 0.15 vol% of methyl ethyl ketone peroxide, and then sufficiently mixed using a forced type mixer, thus manufacturing a polymer concrete composition including atomized steel slag. [100] d) The polymer concrete composition thus manufactured was stirred for 5 min and then loaded into a mold. [101] e) The polymer concrete composition was subjected to vibrating compaction for 4 min, naturally cured at room temperature for 60-90 min, and then released from the mold shrunk by hydraulic pressure. [102] f) The resulting product was naturally cured at room temperature and thus hardened, thereby manufacturing a polymer concrete product including atomized steel slag. [103] 4-2 When the amount of polymer resin is 17 vol% [104] A polymer concrete product was manufactured in the same manner as in Example

4-1, with the exception that 13.6 vol% of the unsaturated polyester resin, 3.4 vol% of the polystyrene resin, 46 vol% of the coarse aggregate, 20.5 vol% of the atomized steel slag, 16.33 vol% of the Ground calcium carbonate, and 0.17 vol% of the methyl ethyl ketone peroxide were used.

[105] 4-3 When the amount of polymer resin is 19 vol% [106] A polymer concrete product was manufactured in the same manner as in Example

4-1, with the exception that 15.2 vol% of the unsaturated polyester resin, 3.8 vol% of the polystyrene resin, 45 vol% of the coarse aggregate, 20 % of the atomized steel slag,

15.81 vol% of the Ground calcium carbonate, and 0.19 vol% of the methyl ethyl ketone peroxide were used.

[107] 4-4 When the amount of polymer resin is 21 vol% [108] A polymer concrete product was manufactured in the same manner as in Example

4-1, with the exception that 16.8 vol% of the unsaturated polyester resin, 4.2 vol% of the polystyrene resin, 44 vol% of the coarse aggregate, 19.5 vol% of the atomized steel slag, 15.29 vol% of the Ground calcium carbonate, and 0.21 vol% of the methyl ethyl ketone peroxide were used. [109] 4-5 When the amount of polymer resin is 23 vol% [110] A polymer concrete product was manufactured in the same manner as in Example 1-1, with the exception that 18.4 vol% of the unsaturated polyester resin, 4.6 vol% of the polystyrene resin, 43 vol% of the coarse aggregate, 19 vol% of the atomized steel slag, 14.77 vol% of the Ground calcium carbonate, and 0.23 vol% of the methyl ethyl ketone peroxide were used.

[I l l]

[112] <Example 5>

[113] Polymer concrete products according to the present invention were manufactured using atomized steel slag as a substitute for the entirety of a conventional aggregate (both a fine aggregate and a coarse aggregate) while varying the amount of unsaturated polyester resin.

[114] 5-1 When the amount of polymer resin is 5 vol%

[115] a) 4 vol% of an unsaturated polyester resin was mixed with 1 vol% of a polystyrene resin using a forced type mixer.

[116] b) Separately, 19.87 vol% of Ground calcium carbonate was mixed with 75 vol% of atomized steel slag using a forced type mixer.

[117] c) The polymer resin obtained in step a) and the powder mixture obtained in step b) were mixed together, added with 0.13 vol% of methyl ethyl ketone peroxide, and then sufficiently mixed using a forced type mixer, thus manufacturing a polymer concrete composition including atomized steel slag.

[118] d) The polymer concrete composition thus manufactured was stirred for 5 min and then loaded into a mold.

[119] e) The polymer concrete composition was subjected to vibrating compaction for 4 min, naturally cured at room temperature for 60-90 min, and then released from the mold shrunk by hydraulic pressure.

[120] f) The resulting product was naturally cured at room temperature and thus hardened, thereby manufacturing a polymer concrete product including atomized steel slag.

[121] 5-2 When the amount of polymer resin is 10 vol%

[122] A polymer concrete product was manufactured in the same manner as in Example 5-1, with the exception that 8 vol% of the unsaturated polyester resin, 2 vol% of the polystyrene resin, 74.84 vol% of the atomized steel slag, 15 vol% of the Ground calcium carbonate, and 0.16 vol% of the methyl ethyl ketone peroxide were used.

[123]

[124] <Comparative Example 1>

[125] Polymer concrete products were manufactured using conventional fine and coarse aggregates while varying the amount of unsaturated polyester resin.

[126] 1-1 When the amount of polymer resin is 15 vol%

[127] a) 12 vol% of an unsaturated polyester resin and 3 vol% of a polystyrene resin were mixed together using a forced type mixer.

[128] b) Separately, 16.85 vol% of Ground calcium carbonate, 47 vol% of a coarse aggregate, and 21 vol% of a fine aggregate were mixed together using a forced type mixer.

[129] c) The polymer resin obtained in step a) and the powder mixture obtained in step b) were mixed together, added with 0.15 vol% of methyl ethyl ketone peroxide, and then sufficiently mixed using a forced type mixer, thus manufacturing a polymer concrete composition including atomized steel slag.

[130] d) The polymer concrete composition thus manufactured was stirred for 5 min and then loaded into a mold.

[131] e) The polymer concrete composition was subjected to vibrating compaction for 4 min, naturally cured at room temperature for 60-90 min, and then released from the mold shrunk by hydraulic pressure.

[132] f) The resulting product was naturally cured at room temperature and thus hardened, thereby manufacturing a polymer concrete product including atomized steel slag.

[133] 1-2 When the amount of polymer resin is 17 vol%

[134] A polymer concrete product was manufactured in the same manner as in Comparative Example 1-1, with the exception that 13.6 vol% of the unsaturated polyester resin, 3.4 vol% of the polystyrene resin, 46 vol% of the coarse aggregate, 20.5 vol% of the fine aggregate, 16.33 vol% of the Ground calcium carbonate, and 0.17 vol% of the methyl ethyl ketone peroxide were used.

[135] 1-3 When the amount of polymer resin is 19 vol%

[136] A polymer concrete product was manufactured in the same manner as in Comparative Example 1-1, with the exception that 15.2 vol% of the unsaturated polyester resin, 45 vol% of the coarse aggregate, 20 % of the fine aggregate, 15.81 vol% of the Ground calcium carbonate, 0.19 vol% of the methyl ethyl ketone peroxide and 3.8 vol% of the polystyrene resin were used.

[137] 1-4 When the amount of polymer resin is 21 vol%

[138] A polymer concrete product was manufactured in the same manner as in Comparative Example 1-1, with the exception that 16.8 vol% of the unsaturated polyester resin, 4.2 vol% of the polystyrene resin, 44 vol% of the coarse aggregate, 19.5 vol% of the fine aggregate, 15.29 vol% of the Ground calcium carbonate, and 0.21 vol% of the methyl ethyl ketone peroxide were used.

[139] 1-5 When the amount of polymer resin is 23 vol%

[140] A polymer concrete product was manufactured in the same manner as in Comparative Example 1-1, with the exception that 18.4 vol% of the unsaturated polyester resin, 4.6 vol% of the polystyrene resin, 43 vol% of the coarse aggregate, 19 vol% of the fine aggregate, 14.77 vol% of the Ground calcium carbonate, and 0.23 vol% of the methyl ethyl ketone peroxide were used.

[141]

[142] <Test Example 1>

[143] Strength of Polymer Concrete Product depending on Use of Atomized Steel Slag

[144] Material Segregation and Change in Density

[145] A 10 x 20 cylindrical specimen of the polymer concrete product of each of Examples 1-1, 2-1, 3-1, 4-1, 5-1 and 5-2 and Comparative Example 1-1 was horizontally divided into three portions, for example, an upper portion, a mid portion and a lower portion, after which respective densities were measured, thus evaluating whether the material segregation was generated depending on the difference in density. The specimen was prepared according to KS F 2419 (specimen preparation method for strength measurement of polyester resin concrete).

[146] The results are shown in FIG. 2.

[147] As shown in FIG. 2, because the specimen according to the present invention was concrete of a stiff consistency having the highly viscous unsaturated polyester resin, the standard deviation of the upper/mid/lower portions thereof in all substitution rates was 0.01 or less. Thereby, it could be seen that there was no sedimentation due to the difference in density of the atomized steel slag, resulting in no material segregation.

[148] In particular, the densities of the polymer concrete products of Examples 4-1, 5-1 and 5-2 could be seen to be increased by about 9%, 11% and 13% respectively, compared to that of the polymer concrete product of Comparative Example 1-1 which did not use the atomized steel slag.

[149] Slump

[150] In a slump cone having a bottom inner diameter of 15 cm, an inner diameter of an upper surface of 10 cm and a height of 15 cm, the polymer concrete composition of each of Examples 1-1, 2-1, 3-1, 4-1, 5-1 and 5-2 and Comparative Example 1-1 was charged in a two-layer configuration through tamping 25 times, the slump cone was vertically raised, and the slump was measured.

[151] The results are shown in FIG. 3.

[152] As shown in FIG. 3, at a substitution rate of 0% (Comparative Example 1-1) of the atomized steel slag for the fine aggregate, the slump value was measured to be 0 mm. The slump was increased in proportion to the increase in amount of the atomized steel slag. Specifically, the slump was measured to be 20 mm at a substitution rate of 25% (Example 1-1), and the slump was measured to be 53 mm at a substitution rate of 50% (Example 2-1). The slump values at substitution rates of 75% (Example 3-1) and 100% (Example 4-1) were measured to be almost the same as the slump value at a substitution rate of 50% (Example 2-1). In particular, in Example 5-1 in which the atomized steel slag was substituted for the entirety of the aggregate, the slump was measured to be 25 mm which was regarded as slightly low, but in Example 5-2 the slump was measured to be 54 mm which was regarded as the highest.

[153] This is thought to be because the shape of the atomized steel slag was spherical, and thus friction resistance between the aggregates was reduced, and also because the atomized steel slag had a specific area smaller than that of sand, and thus the proportion of the resin was relatively increased. Thereby, the use of the atomized steel slag greatly increased the slump. Consequently, in the case where the atomized steel slag was recycled as the fine aggregate, fluidity was remarkably increased.

[154] Compressive Strength

[155] In accordance with KS F 2481 (compressive strength test method for polyester resin concrete), 3 days after pouring the polymer concrete product of each of Examples 1-1, 2-1, 3-1, 4-1, 5-1 and 5-2 and Comparative Example 1-1, compressive strength was measured.

[156] The results are shown in FIG. 4.

[157] As shown in FIG. 4, the strength at a substitution rate of 0% (Comparative Example 1-1) of the atomized steel slag for the fine aggregate was measured to be 117 MPa, and the strength was measured to increase to 126 MPa at a substitution rate of 50% (Example 2-1) but to slightly decrease to 119 MPa at a substitution rate of 75% (Example 3-1). The strength at a substitution rate of 100% (Example 4-1) was measured to be 129 MPa, which was increased by about 10 MPa compared to the strength at a substitution rate of 0% (Comparative Example 1-1). In Examples 5-1 and 5-2 in which the atomized steel slag was substituted for the entirety of the aggregate, the strength was similar to that of Example 4-1.

[158] Although there was no significant difference in compressive strength depending on the substitution rate of the atomized steel slag, when the atomized steel slag was used, the strength was almost the same as or slightly higher than when the atomized steel slag was not used. This is thought to be because the use of spherical atomized steel slag contributed to tighter compacting of the aggregate preventing the generation of cracks under a load. Thus, in the case where the atomized steel slag was recycled as the fine aggregate, the strength could be enhanced.

[159]

[160] <Test Example 2>

[161] Fluidity of Polymer Concrete Product depending on Use of Atomized Steel Slag

[162] Slump

[163] In accordance with KS F 2402 (slump test method for concrete), in a slump cone having a bottom inner diameter of 20 cm, an inner diameter of an upper surface of 10 cm and a height of 15 cm, the polymer concrete composition of each of Examples 1 to 5 and Comparative Example 1 was charged by 1/2 through tamping 25 times. 5 min after the slump cone was vertically raised, the slump was measured.

[164] The results are shown in FIG. 5.

[165] As shown in FIG. 5, as the substitution rate of the atomized steel slag and the amount of the unsaturated polyester resin were increased, the slump value was increased. Further, when the amount of the unsaturated polyester resin was small (stiff consistency), the fluidity enhancement effect depending on the use of the atomized steel slag was much greater. In Example 4 in which the atomized steel slag was substituted for 100% of the fine aggregate, the amount of the unsaturated polyester resin could be seen to be reduced by about 4 vol%, compared to Comparative Example 1 in which only the conventional fine aggregate was used in lieu of the atomized steel slag. In Example 5 in which the atomized steel slag was substituted for the entirety of the aggregate, the amount of the unsaturated polyester resin could be seen to be reduced by about 15 vol% at the same slump.

[166] L-Box Test

[167] The vertical box of an L-box device was filled with the polymer concrete composition of each of Examples 1 to 5 and Comparative Example 1. In a state in which the gate at the bottom thereof was opened, a period of time required to move the polymer concrete composition through the upper portion to the lower end point (30 cm) under vibration conditions was measured.

[168] The results are shown in FIG. 6.

[169] As shown in FIG. 6, as the substitution rate of the atomized steel slag and the amount of the unsaturated polyester resin were increased, fluidity was increased. In particular, when the amount of the unsaturated polyester resin was small (stiff consistency), the fluidity enhancement effect depending on the use of the atomized steel slag was much greater. In Example 4 in which the atomized steel slag was substituted for 100% of the fine aggregate, the amount of the unsaturated polyester resin could be seen to be reduced by about 3 vol%, compared to Comparative Example 1 in which only the conventional fine aggregate was used in lieu of the atomized steel slag.

[170] In Example 5 in which the atomized steel slag was substituted for the entirety of the aggregate, the amount of the unsaturated polyester resin could be seen to be reduced by about 12 vol% on the basis of the same L-box time.

[171] Vebe Test

[172] In accordance with KS F 2427 (kneading test method for un-hardened concrete), a slump cone having an inner diameter of an upper surface of 10 cm, a bottom inner diameter of 15 cm and a height of 20 cm was placed in a container having an inner diameter of 24 cm and a height of 20 cm, and then filled with the polymer concrete composition of each of Examples 1 to 5 and Comparative Example 1, after which tamping was performed, and the slump cone was vertically raised. Thereafter, a disk having a diameter of 23 cm and a mass of 2.75 kg was placed on the polymer concrete composition, vibration was applied thereto for 10 sec, and the settlement depth of the polymer concrete composition was measured.

[173] The results are shown in FIG. 7.

[174] As shown in FIG. 7, as the substitution rate of the atomized steel slag and the amount of the unsaturated polyester resin were increased, fluidity was increased. In particular, when the amount of the unsaturated polyester resin was small (stiff consistency), the fluidity enhancement effect depending on the use of the atomized steel slag was much greater.

Claims

[1] A polymer concrete composition comprising an aggregate and a thermosetting resin for binding the aggregate, wherein part or all of a fine aggregate of the aggregate is replaced with atomized steel slag.

[2] A polymer concrete composition comprising an aggregate and a thermosetting resin for binding the aggregate, wherein both a coarse aggregate and a fine aggregate of the aggregate are replaced with atomized steel slag.

[3] The polymer concrete composition according to claim 1, wherein the polymer concrete composition comprises the thermosetting resin, a coarse aggregate, the atomized steel slag, a shrinkage reducing agent, a filler, and an initiator.

[4] The polymer concrete composition according to claim 1, wherein the polymer concrete composition comprises the thermosetting resin, a coarse aggregate, the fine aggregate, the atomized steel slag, a shrinkage reducing agent, a filler, and an initiator.

[5] The polymer concrete composition according to claim 2, wherein the polymer concrete composition comprises the thermosetting resin, the atomized steel slag, a shrinkage reducing agent, a filler, and an initiator.

[6] The polymer concrete composition according to claim 3, wherein the polymer concrete composition comprises 10-30 vol% of the thermosetting resin, 30-50 vol% of the coarse aggregate, 15-25 vol% of the atomized steel slag, 2-6 vol% of the shrinkage reducing agent, 10-20 vol% of the filler and 0.1-0.5 vol% of the initiator.

[7] The polymer concrete composition according to claim 4, wherein the polymer concrete composition comprises 10-30 vol% of the thermosetting resin, 30-50 vol% of the coarse aggregate, 4.75-15.75 vol% of the fine aggregate, 4.75-15.75 vol% of the atomized steel slag, 2-6 vol% of the shrinkage reducing agent, 10-20 vol% of the filler and 0.1-0.5 vol% of the initiator.

[8] The polymer concrete composition according to claim 5, wherein the polymer concrete composition comprises 4-10 vol% of the thermosetting resin, 45-75 vol% of the atomized steel slag, 0.85-2 vol% of the shrinkage reducing agent, 15-20 vol% of the filler and 0.13-0.16 vol% of the initiator.

[9] The polymer concrete composition according to any one of claims 3 to 8, wherein the thermosetting resin is an unsaturated polyester resin, the atomized steel slag has a density(g/cnf) of 3.3-3.8, a solid volume of 60-70%, and a particle size of 0.3-5 mm, the initiator is methyl ethyl ketone peroxide, the shrinkage reducing agent is a polystyrene resin, and the filler is Ground calcium carbonate. [10] A method of manufacturing a polymer concrete composition, comprising: a) mixing a thermosetting resin with a shrinkage reducing agent; b) mixing a filler, a coarse aggregate, and atomized steel slag; c) mixing the resin mixture obtained in a) with the powder mixture obtained in b); and d) adding an initiator to the mixture obtained in c).

[11] A method of manufacturing a polymer concrete composition, comprising: a) mixing a thermosetting resin with a shrinkage reducing agent; b) mixing a filler, a fine aggregate, a coarse aggregate and atomized steel slag; c) mixing the resin mixture obtained in a) with the powder mixture obtained in b); and d) adding an initiator to the mixture obtained in c).

[12] A method of manufacturing a polymer concrete composition, comprising: a) mixing a thermosetting resin with a shrinkage reducing agent; b) mixing a filler and atomized steel slag; c) mixing the resin mixture obtained in a) with the powder mixture obtained in b); and d) adding an initiator to the mixture obtained in c).

[13] The method according to any one of claims 10 to 12, wherein, in a), the thermosetting resin is an unsaturated polyester resin, the shrinkage reducing agent is a polystyrene resin, and the unsaturated polyester resin and the polystyrene resin are mixed at a volume ratio of 4: 1 ; in b), the atomized steel slag has a density(g/cnf) of 3.4-3.6, a solid volume of 60-70%, and a particle size of 0.3-5 mm, and the filler is Ground calcium carbonate; and in d), the initiator is methyl ethyl ketone peroxide.