KR20030080270A - concrete in contained copper slag - Google Patents

Abstract

PURPOSE: Provided is constructional concrete containing copper slag instead of fine aggregate for concrete, which has physical properties similar to those of the concrete containing a natural aggregate. CONSTITUTION: The concrete for construction and civil engineering materials comprises a cement and fine aggregates such as river sand, crushed sand, sea sand and the like. The concrete is characterized in that the fine aggregates are partially or totally substituted by the copper slag obtained from the copper refining processes. In particular, the copper slag is incorporated in 30 to 100 volume %. Further, the concrete is compounded with water in the water/cement ratio of 40-65% with the slump of 8 to 18±2cm.

Description

Concrete in contained copper slag

The present invention relates to concrete using copper slag, and more specifically, by producing concrete by replacing the sand used as fine aggregate with copper slag aggregate, exhibiting economical and environmental benefits while exhibiting physical properties suitable for concrete. It is about concrete that can be obtained.

Cement generally refers to portland cement, but broadly organic. Both inorganic and adhesives are sometimes called cement. Such cements are formulated, pulverized and mixed with limestone and clay as main ingredients to properly contain lime (CaO), silica (SiO ₂ ), alumina (Al ₂ O ₃ ) and iron oxide (Fe ₂ O ₃ ) components. It is pulverized by adding an appropriate amount of gypsum to a clinker made by firing at a temperature of about 1450 ° C. or higher.

The cement is mixed with sand, stone powder or gravel and water, and is used in a large amount of concrete products such as mortar or concrete, various bricks such as civil engineering, construction, and other structures, interlocking blocks for sidewalks and driveways, and concrete boundary blocks.

The most important factors in the manufacture of such bricks and blocks are the selection of the appropriate mixing ratio between the cement and aggregate serving as a hardener and the curing temperature.

Since concrete is generally used for structures using reinforcing bars (in the case of tetraports, plain concrete), it is appropriate to mix cement, coarse aggregate, fine aggregate (steel sand, crushed sand, sea sand), and admixture. It should be designed so that the construction of the building can be stable and solid.

Due to the influence of national and environmental preservation, it is becoming more difficult to collect natural aggregates and sea sand, and concrete structures can be manufactured using materials that can replace natural aggregates in the situation that they must continue to be built. If so, this is very desirable.

On the other hand, in recent years in the manufacture of bricks and blocks, various waste resources are utilized. For example, fly ash generated from thermal power plants may be used by blending up to 30% by weight. When fly ash is used in the mixing of general concrete, durability is increased, heat of hydration is reduced, and chemical resistance is increased. Unlike general concrete, the reduction of drying shrinkage may occur, but when used in concrete bricks and interlocking blocks, the porosity is quite high and can be generally classified as specialty concrete. The advantages are not great.

In addition, the slag generated from the blast furnace of the steelmaking industry, that is, the cement composition utilizing the blast furnace slag is disclosed in Korean Patent Laid-Open Publication No. 2001-0038096 and Korean Registered Patent Publication No. 0218778, fireproof. The manufacturing method of bricks and the manufacturing method of hardened body using soda silicate and blast furnace slag are known in Korean Patent Publications (2000-0017919, 1995- 0003207, 1987-0005926, 1986-0001022, 1985-0001838). All of these are very different from utilizing the slag generated from copper smelting to be pursued in the present invention, such as different raw materials for concrete.

The present invention utilizes the slag generated during the copper smelting process as a fine aggregate for concrete, thereby producing concrete products, and having a physical characteristic similar to that of natural aggregate, and having a low cost of manufacturing according to the utilization of waste resources. And to obtain concrete for building materials.

1 is the classification of aggregates according to specific gravity

Figure 2a is a graph showing the specific gravity according to the type of aggregate

Figure 2b is a graph showing the absorption rate according to the type of aggregate

Figure 3a is a graph showing the unit volume weight according to the type of aggregate

3b is a graph showing the performance rate according to the type of aggregate

4 is a graph showing the particle size distribution of copper slag aggregate

5A is a graph showing the relative dynamic modulus of elasticity over cycles for type I

FIG. 5B is a graph showing relative dynamic modulus of elasticity over cycle for type II

6 is a diagram of the tetrapot

7 is a hardened concrete surface photo

The present invention for achieving the above object in the concrete comprising cement, fine aggregates (steel sand, crushed sand, sea sand, etc.), copper slag generated in the process of smelting a part or all of the fine aggregates made of concrete containing copper slag, characterized by being replaced by copper slag.

In the case of replacing the above-mentioned copper slag with fine aggregate, it is applicable to alternative mixing ratio of 30 to 100 (vol.%), And in the case of general weight concrete, 50 to 100 (vol.%) And tetrate having the form as shown in FIG. In the case of a pot or a sofa block, it is preferable to set it as 30-60 (vol%).

In addition, the present invention can be used by replacing the slag generated in the blast furnace with cement (30 to 50% by volume) contained in the concrete, it is particularly preferable to apply to the tetra pot or sofa block Do.

In the concrete mix design, the ratio of water and cement (W / C) is 40 to 65%, and the slump is 8 to 18 ± 2 cm. In the case of heavy concrete, the slump is 10 to 18 ± 2 cm. In the case of a dragon block, it is preferable to set it as 8-15 +/- 2cm.

The granularity and particle size of the copper slag used in the present invention is similar to that of general natural aggregate, and other physical properties are also the same level. However, the specific gravity of general aggregate is 2.4 ~ 2.65, whereas copper slag shows 3.4 ~ 3.7, so it should be used through accurate mix design and characteristics prediction.

Therefore, the present invention is to analyze the characteristics of the copper slag and to verify the optimum mix for utilizing it in concrete and the extent and durability of the physical properties accordingly.

Classification according to the weight of the general aggregate can be in the form as shown in Figure 1 and (Table 1). Aggregates with a specific gravity of 3.0 or more are classified as heavy aggregates, and in the case of copper slag, the specific gravity is heavier than that of general aggregates, such as 3.4 to 3.7. Therefore, it is possible to produce concrete having a unit volume weight of 2.5 t / m ³ or more using copper slag aggregate.

Concrete weight Concrete type Fine aggregate Coarse aggregate Weight range (t / m ³ ) Concrete weight Firohoz ferrite Pearl 5.0 to 6.0 magnetite magnetite 4.5 to 5.5 magnetite Barite 3.5 to 4.0 Barite Barite 3.5 to 3.8 Brown iron ore Brown iron ore 2.5 to 3.5 Ordinary concrete River sand Crushed coarse aggregate 2.2 to 2.4 Lightweight concrete River sand Swelling shale 1.7 to 2.0 Swelling shale Swelling shale 1.4 to 1.7 Soft volcanic rock Soft volcanic rock 1.2 to 1.6 Foam Concrete 0.5 to 1.2

The most important part in the manufacture of concrete is the ratio of water and cement (W / C) and fine aggregate (S / A), and the water-cement and fine aggregate ratio is adjusted according to the strength and slump desired, Use air emulsifiers and water reducers accordingly.

Especially, in case of tetrapot, it is plain concrete, and it is directly affected by seawater, so it must be verified. There are three methods for estimating the required weight of tetraports by stacking tetraports: the method based on the hydraulic model test, the method to obtain the required weight experimentally, and the method of estimating the construction example.

The formula for calculating required weight by empirical formula

W / = r _rH ³ / K _P (S _r -1) ³ cot α ------ (Equation 1)

W: Required weight of tetra pot (ton)

r _r : Unit weight of concrete (ton / m ³ )

S _R : Specific gravity of seawater in concrete (r _r / r _w )

r _w : Unit weight of sea water (1.03 ton / m ³ )

H: Design crest (m)

K _P : Constant determined by the cladding and damage rate

α: angle between slope and horizontal plane

In general, concrete mixing conditions and strength characteristics used in the manufacture of coastal concrete are shown in Table 2.

Kinds Types of structural members Compound Condition Maximum dimension of coarse aggregate (cm) Minimum Characteristic of Concrete StrengthN / mmm ² (kgf / cm ² ) Water and cement ratio (%) Slump (cm) Areas where freeze-thawing frequently occurs Rare areas where temperatures are below zero Plain Concrete Breakwater overhead, caisson covering concrete 60 60 8, 12 40 18 {180} Body Block, Release Block (Sofa, Cover) 60 60 8, 12 40 18 {180} Pode concrete, hard block 60 60 8, 12 40 18 {180} Mooring facility upper part, chest wall, mooring line foundation (gravity type) 55 60 8, 12 40 18 {180} Reinforced concrete Mooring cycle foundation (pile type), chest wall, mooring facility 55 60 8,12,15 20,25,40 24 {240} Overpass 50 50 8,12,15 20,25,40 24 (240) L-shaped, Couch block, caisson, well, hollow block 50 50 8,12,15 20,25,40 24 {240} Bracing wall, bracing feet, upper part 55 55 8,12,15 20,25,40 24 {240} Apron packaging - - 2.5, 6.5 20,40 Warp: 4.5

The mixing design for the use of copper slag in concrete used for sofa blocks such as tera pot is as follows.

① Determination of W / C in consideration of strength and durability

② Determination of maximum aggregate size

③ Slump considering water-cement ratio and maximum aggregate size

④ Determination of air quantity, fine aggregate, unit quantity

⑤ Revision of aggregate aggregate rate and unit quantity according to mixing conditions

⑥ Determination of amount of cement and admixture

⑦ Determination of the amount of coarse materials and fine aggregates

⑧ Analysis of indoor test results and site mix design

Before carrying out the formulation design based on the above sequence, the properties of each material should be known. In general, most of the materials used in concrete are made of the same material, so the design should be done based on the data used in the past. For example, cement is 3.15, coarse aggregate is 2.6, etc., and it is mixed with general results, but in order to use different materials such as copper slag, the exact characteristics of the material used must be understood.

In addition, the materials used should not have adverse effects on the environment during use and should not adversely affect concrete in the long term. In the present invention, in the use of copper slag, the compound design was conducted by examining all the properties of the materials used to solve these problems. Especially, in the case of copper slag, the dissolution test was also performed in consideration of the environmental impact. A test was performed to predict the degradation of durability due to the aggregate reaction.

Currently, there are two types of copper slag that can be supplied in Korea: copper slag generated in the own furnace and copper slag generated in the continuous furnace. The characteristics of the copper slag utilized in the present invention is shown in Table 3.

Copper Slag Characteristics Exam Content Copper slag Natural aggregate Remarks For free In a row Unit weight (kg / m ³ ) 2,400 2,238 1,816 KSF 2505 Porosity (%) 33.5 40 % Of performance 66.5 60 63.6 importance Absolute dry 3.74 3.40 2.59 KSF 2504 Surface drying 3.81 3.46 Absorption rate (%) 0.52 0.2 0.90 Clay mass (%) 0.6 0.1 KSF 2512 No. 200 sieve passage (%) 0.4 0.3 KSF 2511 Assembly rate 3.40 3.51 2.62 KSF 2502 Aggregate Stability (loss weight%) 7.1 1.2 KSF 2507 Alkali aggregate reaction (expansion rate (%) 0.019 0.019 KSF 2546

As described above, copper slag aggregates have a higher absolute dry weight and unit volume weight than natural aggregates, and thus should be reflected in the blending design and the structure design. Looking at the content of each item in more detail,

Specific Gravity Absorption

Aggregate specific gravity is used in the calculation of concrete mix design, yield, porosity, etc. In general, the higher the specific gravity, the denser, less absorbed, and greater durability. Therefore, specific gravity and absorption of aggregates are used as a means of evaluating the properties of aggregates.

Copper specific gravity and water absorption test was carried out in accordance with KS F 2504 "Specific gravity and water absorption test of fine aggregate", and the specific gravity and water absorptivity of absolute dryness and surface dryness were measured, respectively. Copper slag exhibits differences in physical properties depending on the production process. The absolute dry weight of natural sand was 2.59, and slag for slag was 3.74 and slag for continuous furnace was 3.10, 44% and 20% higher than natural sand.

Absorption rate was much lower than that of the general natural sand 0.90%, 0.52%, 0.20% appeared to be very excellent in water stability. Since the main component of the copper slag aggregate is high in metals such as Fe, the specific gravity is high and the absorption rate of the aggregate is judged to be low (FIG. 2).

These results were found to satisfy the "specific gravity of fine aggregates (2.50 or more) and absorption rate (3.0% or less)" specified in concrete aggregates (KS F 2526), and had the appropriate physical properties as aggregates for concrete and concrete manufacturing.

② Unit Weight

Unit volume of the aggregate by weight is used in the aggregate means the weight of 1m ³ porosity of the aggregate, the aggregate volume of formulation, the aggregate the compounding ratio, the storage area calculation. As the unit volume weight measurement method, KS F 2505 "Unit Volume Weight and Porosity Test of Aggregate" was applied.

Percentage fo Voids is the percentage of pores in the unit volume. The smaller the porosity, the smaller the amount of cement paste, and economically, the more concrete the desired strength can be achieved. Also, the Percentage of Solids is a percentage of the actual fraction of the aggregate when filled in a container, the larger the aggregate and the smaller the mortar or concrete paste when the particle size distribution is appropriate. In addition, concrete strength, density, watertightness, durability, wear resistance, etc. are increased.

Therefore, a weight per unit area of the copper slag aggregate with resin is 2,400kg / m ^3, in incontinence unit weight of copper slag aggregate is a continuous unit weight of natural sand to 2,238kg / m ³ is compared to 1,816kg / m ³ slag About 32% and slag was about 23% higher. In KSF 2526, and thus, satisfies all the criteria specified in JIS A5011-3 does not set (copper slag aggregates for concrete) unit weight 1,800kg / m ³ or more rules that for the unit weight of the aggregate.

The slag performance rate of slag for self-furnace slag was 66.5%, which is better in filling than 63.6% of natural sand, but copper slag was 60% in succession. This is because the granular shape of the aggregate shows a circular shape in the case of a self-melting furnace, but in the case of copper slag continuously, it is judged to be because there are many particles of a rectangular shape (FIG.

③ Clay contained in Aggregate

Deterious substances contained in aggregates include dust, clay lumps, slits, microparticles of mica, peat, humus and other organic substances and chemical salts. Clay, chimney, and mica are not evenly distributed in aggregate, but if they are in close contact with aggregate surface, they lose adhesion with cement paste and lower the strength. .

The clay mass was tested by KS F 2512 "Testing method for the mass of clay contained in aggregate", which showed that the copper slag was 0.6% for the furnace and 0.1% for the copper slag. In addition, these results were found to satisfy 1.0% of the amount of clay aggregates of fine aggregates in KS F 2526 (concrete aggregates), which showed no problem in usability.

④ No.200 sieve passage amount (0.08mm sieve passage amount)

The clay, chimney and fine particles contained in the aggregates need to be separated from the aggregates because they cause an increase in the unit quantity of concrete and a decrease in strength and durability. The No.200 sieve test for the purpose of determining the total amount of particulates for aggregates was carried out by applying KS F 2511 "Test method for fine particles (through 0.08mm sieve) contained in aggregate". Furnace copper slag is 0.4%, continuous furnace slag is 0.3%, which is very low, which satisfies 3.0 ~ 5.0% of fine aggregate regulation of Korea Industrial Standard (KS F 2526) as a concrete aggregate. Was found to be absent.

⑤ Fineness Modulus

As a method of quantitatively indicating the particle size of aggregate, 10 sieves of 80, 40, 20, 10, 5, 2.5, 1.2, 0.6, 0.3, and 0.15 mm are sifted into one set, and the total amount of the amount remaining in each sieve Expressed as a percentage of, the sum divided by 100. According to the KS F 2502 "Testing method for the sieving of aggregate", copper slag for self-use furnace was 3.45, and copper slag was 3.51 in continuous furnace, which was somewhat higher than natural sand 2.62.

⑥ Stabilization test of aggregate

As a method for evaluating the resistance to the freezing and thawing action of aggregates, it is determined based on the resistance to the breaking action by the crystallization pressure of sodium sulfate. Stability is used as a data for judging the durability by meteorological action.

The stability test was conducted by adding to Na ₂ SO ₄ solution according to KS F 2507 "Test method for stability of aggregate". The fine aggregate was carried out in four groups with a percentage of 5% or more due to the sieve separation, and was repeated 5 times after drying for 16-18 hours in Na ₂ SO ₄ solution to 7.1% and 1.2% for KS F 2526 (concrete). Yong aggregate) was found to meet the stability criteria of fine aggregate less than 10%.

Copper smelting slag tends to deviate slightly from the fine powder among fine aggregates defined by the Korean Industrial Standards due to the high assembly rate. In both continuous and freezer aggregates, it was found to meet the regulations.

⑦ alkali-aggregate reaction test

Expansion caused by alkali-silica reaction may affect the durability of the concrete and the safety of the structure. An alkali-aggregate reaction may occur by mixing a strong alkaline cemente and an aggregate containing 60% or more of silica. Mortar rod test was conducted by KS F 2546 (Alkaline Potential Test Method for Mixing Cement and Aggregate) to determine the expandability of copper slag with up to 35% silica by alkali-silica reaction. The test result was 0.018% after 3 months and 0.019% after 6 months, showing no increase in swelling over time, and much lower than 0.05% for 3 months and 0.10% for 6 months. It has been shown to be very stable to expansion by the alkaline-silica reaction.

The particle size distribution is shown in (Table 4) and FIG. 4, and showed a smaller fine powder than general natural aggregate.

Granularity of Copper Slag Aggregate division % Sieve weight 10 mm 5 mm 2.5mm 1.2 mm 0.6mm 0.3mm 0.15mm Private Furnace 100 99.4 91.1 39.8 22.4 1.3 0.5 Continuous Copper Smelting 100 97.1 65.1 22.4 7.5 4.0 1.5

In addition, in order to confirm the possibility of secondary environmental pollution by the use of copper slag, the leaching of heavy metal harmful to human body in the slag itself was examined. Since clay bricks are used outdoors, especially as fences, they can be said to have great potential for the elution of harmful substances by rainwater. As a result of the elution test on copper smelting slag, the pollutant content is as shown in (Table 5), and the general waste according to the acceptance criteria of (Table 5), the waste classification standard set out in Article 2 of the Enforcement Rule of the Waste Management Act. And specific wastes.

The dissolution test results showed that copper and slag of copper smelting slag were detected at very low levels, and other heavy metals were hardly discharged. Therefore, smelting copper was found to be below the standard for all harmful items and was found to be environmentally stable.

As a result of the dissolution test by the waste process test method, no elution of As, Hg, Cr, CN, trichloroethylene, tetramethylene and organic phosphorus as regulated substances was found. Traces of Cd, etc. were detected, but were much lower than the limit.

Note) tr: 0.003ppm or less, ND: not detected

The EP Toxicity Test (Methtods 1310), conducted in the United States for environmental hazard assessment, was conducted to assess the potential leaching of solidified waste and to determine whether it is hazardous.

Elution test results of copper smelting slag according to the US EPT method (Table 6), such as Hb, Cd, Cr, etc. among Pb, Ag, As, Hg, Cd, Cr, Se, and Ba Was not detected at all. Ag and Se were found to be almost as low as 0.003 ppm or less, and the rest of the materials showed very low dissolution compared to the acceptance criteria.

Note) TR: 0.03 ppm or less, ND: Not detected

As a result of the hazardous waste dissolution test conducted by the Japan Environmental Agency, as shown in (Table 7), most of the items did not show any hazardous substance dissolution. There is no environmental problem.

The following is described according to the embodiment.

(Example 1)

At present, two types of copper slag that can be supplied in Korea were used, and a compound test was conducted according to W / C and slump. Copper slag was used up to 25, 50, 75, and 100% of natural fine aggregates to produce general weight concrete specimens.

Experimental Blend Factors and Levels division Slump area (cm) W / C Copper slag mixing rate)%) Arguments and Symbols 18 ± 2 (type I) 10 ± 2 (type II) 45 (A), 55 (B), 65 (C) 0 (1), 25 (2), 50 (3), 75 (4), 100 (5) level 2 3 5

According to the compounding factors and levels as shown in (Table 8), the specimens were manufactured in various types as shown in (Table 9), and physical properties were tested to obtain the characteristics as shown in Tables 10 to 12.

Compound Factors and Levels Test body W / C Incorporation rate (%) Slump (cm) Air volume (%) Unit weight (t / m ³ ) 7 days 28 days 56 days 91 days Ⅰ-A-1 45 0 21 4.1 2.36 2.38 2.34 2.33 Ⅰ-A-2 25 21 4.6 2.41 2.41 2.39 2.40 Ⅰ-A-3 50 25 3.5 2.50 2.51 2.46 2.46 Ⅰ-A-4 75 21.5 3.9 2.57 2.58 2.55 2.56 Ⅰ-A-5 100 23 4.4 2.64 2.66 2.63 2.60 Ⅰ-B-1 55 0 23.5 2.5 2.31 2.41 2.36 2.33 Ⅰ-B-2 25 24.5 2.6 2.46 2.46 2.39 2.39 Ⅰ-B-3 50 21.3 2.1 2.52 2.54 2.50 2.43 Ⅰ-B-4 75 21 3.0 2.61 2.60 2.56 2.55 Ⅰ-B-5 100 22.3 3.5 2.66 2.67 2.68 2.59 Ⅰ-C-1 65 0 24 3.2 2.57 2.33 2.36 2.33 Ⅰ-C-2 25 22.5 1.2 2.45 2.51 2.42 2.47 Ⅰ-C-3 50 21.5 2.3 2.31 2.55 2.50 2.48 Ⅰ-C-4 75 20.5 2.0 2.64 2.65 2.60 2.60 Ⅰ-C-5 100 19.5 2.7 2.36 2.58 2.50 2.57

Physical property test results (type I: slump 18 ± 2cm) Test body Tensile strength (kgf / cm ³ ) Flexural strength (kgf / cm ³ ) Compressive strength (kgf / cm ³ ) Ultrasonic Speed (km / sec) Modulus of elasticity (x10 ⁵ kg / cm ² ) 5 days 28 days 56 days 91 days 7 days 28 days 56 days 91 days Ⅰ-A-1 36 44 224 372 486 498 4.665 4.745 4.669 5.068 7.7 Ⅰ-A-2 35 55 231 380 501 518 4.541 4.638 4.676 5.094 8.5 Ⅰ-A-3 33 42 233 406 472 492 4.570 4.589 4.643 4.994 7.8 Ⅰ-A-4 39 49 258 411 502 516 4.503 4.612 4.549 4.767 7.8 Ⅰ-A-5 39 50 215 398 455 475 4.471 4.612 4.471 4.463 7.9 Ⅰ-B-1 33 38 172 300 418 425 4.537 4.627 4.614 4.627 6.2 Ⅰ-B-2 31 40 173 311 345 355 4.541 4.685 4.603 4.477 5.5 Ⅰ-B-3 28 52 190 353 395 400 4.481 4.688 4.530 4.609 5.7 Ⅰ-B-4 32 44 242 350 434 445 4.375 4.582 4.406 4.632 5.6 Ⅰ-B-5 29 42 196 301 385 396 4.226 4.498 4.398 4.325 5.5 Ⅰ-C-1 27 37 140 250 324 330 4.135 4.555 4.533 4.402 5.5 Ⅰ-C-2 32 39 155 240 275 293 4.413 4.610 4.381 4.490 5.4 Ⅰ-C-3 32 37 167 260 300 322 4.347 4.349 4.455 4.183 5.4 Ⅰ-C-4 29 37 187 273 292 298 4.416 4.525 4.338 4.524 4.3 Ⅰ-C-5 27 38 163 220 255 275 4.297 4.297 4.206 4.071 3.5

Physical property test result (type II: 10 ± 2cm slump) Test body W / C Incorporation rate (%) Slump (cm) Air volume (%) Unit weight (t / m ³ ) Thermal Conductivity (kcal / mh ℃) 7 days 28 days 56 days 91 days Ⅰ-A-1 45 0 8 5.6 2.22 2.27 2.25 2.34 0.34 Ⅰ-A-2 25 12 6 2.34 2.35 2.34 2.33 0.48 Ⅰ-A-3 50 15 6.2 2.45 2.51 2.40 2.51 0.60 Ⅰ-A-4 75 17 6.4 2.50 2.52 2.49 2.60 0.39 Ⅰ-A-5 100 18 6.5 2.55 2.59 2.52 2.68 0.36 Ⅰ-B-1 55 0 12 5 2.27 2.28 2.24 2.33 0.52 Ⅰ-B-2 25 15 5.3 2.34 2.36 2.29 2.42 0.55 Ⅰ-B-3 50 16 5.5 2.43 2.45 2.40 2.51 0.35 Ⅰ-B-4 75 18 5.2 2.50 2.53 2.45 2.57 0.29 Ⅰ-B-5 100 19 5.8 2.56 2.60 2.52 2.63 0.31 Ⅰ-C-1 65 0 12 4.3 2.23 2.24 2.16 2.27 0.47 Ⅰ-C-2 25 16 4.8 2.34 2.34 2.31 2.34 0.41 Ⅰ-C-3 50 17 4.8 2.39 2.43 2.39 2.49 0.32 Ⅰ-C-4 75 18 5.4 2.48 2.51 2.42 2.60 0.40 Ⅰ-C-5 100 19 5.1 2.49 2.51 2.45 2.59 0.35

Physical property test result (type II: 10 ± 2cm slump) Test body Tensile strength (kgf / cm ³ ) Flexural strength (kgf / cm ³ ) Compressive strength (kgf / cm ³ ) Ultrasonic Speed (km / sec) 7 days 28 days 56 days 91 days 7 days 28 days 56 days 91 days Ⅰ-A-1 33.8 43.2 235 322 356 362 4.49 4.53 4.93 4.92 Ⅰ-A-2 32.8 50.4 244 320 339 346 4.40 4.45 5.04 4.84 Ⅰ-A-3 34.6 51.2 250 312 337 340 4.33 4.31 4.05 4.77 Ⅰ-A-4 32.3 53.6 242 323 327 330 4.31 4.24 4.85 4.72 Ⅰ-A-5 29.3 40.8 223 308 319 328 4,31 4.32 4.86 4.73 Ⅰ-B-1 26.0 48.0 199 270 311 318 4.48 4.52 5.00 4.45 Ⅰ-B-2 27.4 49.6 191 258 283 289 4.30 4.47 4.86 4.29 Ⅰ-B-3 28.3 52.8 175 244 259 265 4.29 4.34 4.80 4.56 Ⅰ-B-4 27.2 41.6 166 218 229 249 4.15 4.29 4.86 4.22 Ⅰ-B-5 25.3 42.4 137 206 215 227 4.15 4.27 4.64 4.41 Ⅰ-C-1 23.8 36.0 122 202 205 209 4.26 4.41 4.81 4,14 Ⅰ-C-2 22.8 43.2 140 200 217 225 4.22 4.31 4.74 4.49 Ⅰ-C-3 23.3 40.8 113 181 200 206 4.14 4.20 4.63 4.00 Ⅰ-C-4 20.0 32.8 102 158 159 165 4.02 4.04 4.51 4.33 Ⅰ-C-5 18.9 32.8 84 122 141 145 3.80 3.94 4.24 3.37

As a result of slump measurement, there was no change according to slag mixing rate at target slump 18 ± 2cm and slump also increased with increasing slag mixing rate at 10 ± 2cm, but in case of compressive strength, the change of strength according to slag mixing rate Did not appear. Therefore, it is shown that the strength estimation of concrete mixed with copper slag can be made enough if the mixing design with the change of strength according to the water-bonding material ratio and the consideration by the weight are performed.

In addition, as a result of freezing and melting test for long-term durability prediction of concrete, the relative dynamic modulus of elasticity was not changed according to the incorporation of copper slag (FIGS. 5a and 5b), and the appearance was also not different from the existing products. However, there was a change due to the change in W / C.

(Example 2)

Currently, copper slag, which can be supplied in Korea, was used to test the mix according to the slump, strength, and aggregate dimensions. Copper slag was used to replace existing aggregates by 30% and 50%, while blast furnace slag was used by replacing 40% of the amount of cement.

Experimental Blend Factors and Levels division Slump area (cm) Target Compressive Strength (kgf / cm ² ) Copper Slag Mixing Ratio (%) Blast Furnace Slag Powder Arguments and Symbols 12 ± 1 (type I) 180 30, 50 40% 12 ± 1 (type II) 280 30, 50

Tetrapot specimens were prepared according to the compounding factors and levels as shown in Table 13, and the compressive strength was measured for 28 days. The characteristics as shown in Table 14 were obtained.

The slump was found to satisfy all 12cm slumps of general marine concrete, and there was no bleeding, hardening delay, or acceleration due to the incorporation of copper slag. However, there was a high slump phenomenon as the copper slag content increased, which has the advantage of reducing the amount of coma that can be used, which has an effect on the strength and durability of concrete.

In addition, as a result of freeze-thawing test for long-term durability prediction of concrete, the relative dynamic modulus of elasticity was not changed according to the incorporation of copper slag.

Figure 7 is a photograph showing the surface state of the cured concrete of the present invention carried out as described above.

As described above, the present invention replaces the fine aggregate mixed in the concrete mixture with copper slag generated in the copper smelting process, thereby obtaining economic and environmental benefits from the recycling of waste resources as well as having similar physical characteristics as those of the existing fine aggregate. You can get concrete.

Claims (6)

In concrete containing cement and fine aggregates (steel sand, crushed sand, sea sand, etc.), a part or all of the fine aggregates is replaced by copper slag generated during copper smelting. Concrete containing copper slag used in civil engineering and building equipment. The method of claim 1, The concrete containing copper slag used in civil engineering and building equipment, characterized in that the replacement mixing ratio of the copper slag is 30 to 100 (% by volume). The method of claim 2, Concrete containing copper slag used in civil engineering and building materials, characterized by water / cement ratio of 40-65% and slump of 8-18 ± 2cm. The method of claim 2 or 3, The concrete containing copper slag used in civil engineering and building materials, characterized in that the replacement mixing ratio of the copper slag is 30 to 60 (vol.%). The method of claim 4, wherein Copper slag-containing concrete, characterized in that the civil engineering and building materials for tetrapots or sofa blocks. The method of claim 5, Concrete containing copper slag used in civil engineering and building materials, characterized by replacing blast furnace slag fine powder with 30-50% by volume of cement.