KR102015597B1 - Composition for concrete waterway pipe for wet vibration molding using electric furnace copper slag fine aggregate - Google Patents

Abstract

The present invention relates to a composition for a concrete waterway pipe for a wet vibration molding using electric furnace copper slag fine aggregate and a concrete waterway pipe using the same. The composition for the concrete waterway pipe is able to secure the compressive strength, flexural strength and durability of concrete to be equivalent or better compared to existing concrete waterway pipes, prevent separation of a concrete material and secure excellent formability of a waterway pipe by including the electric furnace copper slag fine aggregate and further including an organic and inorganic hybrid thickener. The present invention includes blended water, aggregate and a cement-based binder and additionally includes electric furnace copper slag fine aggregate and an organic and inorganic hybrid thickener. With respect to the total concrete composition, 20 to 50 wt% of the electric furnace copper slag fine aggregate is included and when the cement-based binder is included at 100 wt%, 0.5 to 1.0 wt% of the organic and inorganic hybrid thickener is included. The present invention recycles 20 to 50 wt% of electric furnace copper slag fine aggregate with respect to the total concrete composition compared to existing waterway pipes, is able to manufacture the concrete composition having economical and excellent performance by using inexpensive aggregate for concrete and reducing water and cement costs, and has an environmentally friendly advantage of reducing an environmental load for natural damage through mass reduction of the use amount of natural aggregate.

Description

Composition for concrete waterway pipe for wet vibration molding using electric furnace copper slag fine aggregate}

The present invention relates to a concrete composition for the production of water pipes used for drainage of roads or for drainage of agricultural waterways and water pipes manufactured using the same. Specifically, industrial by-products generated during the process of smelting copper in an electric furnace are aggregates. Concrete channel for wet-vibration molding using copper slag fine aggregate which is eco-friendly by improving the compressive strength and durability of concrete channel and minimizing the use of natural aggregate. It is about.

Water pipes used for drainage of existing roads or for drainage of agricultural waterways are mainly made of concrete because of usability, economic feasibility, and durability.

Aggregate is the most abundant material in the construction of concrete, and about 240 million cubic meters is collected annually from nature such as mountains, rivers, and the sea, and is used for concrete production. As a result of the confrontation, social problems related to the collection of aggregates frequently occur, increasing supply and demand imbalance. Therefore, measures to compromise the preservation and development of resources through the development and expansion of aggregates that can replace natural aggregates for concrete have emerged as an indispensable task in the construction market.

Electric furnace copper slag is generated 700,000 tons per year in Korea, and if the technology that can be used as a substitute for natural aggregate is developed, the use of copper slag will increase its value in order to protect the global environment due to depletion of natural aggregate. It can be said that it is economically advantageous because it forms a very low price compared to natural aggregate.

Therefore, if the development of technology to utilize copper slag as a substitute aggregate for concrete will have a significant meaning in terms of environmental conservation and economic efficiency by recycling industrial by-products.

Currently, a number of studies have been conducted to utilize copper furnace slag, which is an industrial by-product, as a fine aggregate for concrete, but most studies have used copper slag less than 20% by weight of the entire concrete mixture. / The cement is limited to block-type concrete products made by semi-dry compression molding of 30% or less, and its use is very limited.

On the other hand, in the case of concrete water pipes made of wet vibration molding having a water / cement ratio of 40% or more, when the copper slag is used in an electric furnace of more than 20% by weight, the material of concrete during vibration molding is due to the high density and low absorption rate of the copper slag. Separation is inevitably generated, and therefore, the problem of moldability and underperformance of water pipes must be solved technically.

Recently, as the social demand for eco-friendly products to cope with the depletion of natural resources and global warming is increasing, it is necessary to develop eco-friendly concrete products that can use copper slag fine aggregates in large quantities by replacing natural aggregates used in concrete water pipes. have.

Republic of Korea Patent Publication No. 10-0944238 (2010. 02. 24. notification).

The present invention was newly developed in order to satisfy the environmental and manufacturing technology required in the technical field as described above, and by reusing large amounts of industrial copper by-product slag as fine aggregates for concrete, which can protect the environment by replacing natural resources An object of the present invention is to provide a concrete composition and a waterway pipe using the same, which can be usefully used to manufacture an eco-friendly concrete waterway pipe.

In the present invention, in order to achieve the above problems, there is provided a concrete composition comprising a blended water, aggregate (coarse aggregate and coarse aggregate) and cement-based binder, such a concrete composition of the present invention copper slag fine aggregate is the total concrete composition 100 20 to 50% by weight or less, preferably 30 to 50% by weight, more preferably 40 to 50% by weight relative to the weight%.

In addition, the concrete composition of the present invention further includes an organic-inorganic hybrid thickener for preventing material separation of the copper slag due to high density and low absorption rate in the wet vibration molding of the concrete mixture using a large amount of copper slag, organic-inorganic The hybrid thickener is contained in an organic-inorganic hybrid thickener 0.5 to 1.0% by weight when the cement binder is 100% by weight.

In the present invention as described above, the electric furnace copper slag is characterized in that the spherical and irregular form of the particle shape is mixed, it is made by crushing the slag generated in the process of producing copper in the electric furnace, 100 of the copper slag Based on the weight percent, Fe is composed of 35 to 45% by weight, 31 to 37% by weight of SiO ₂ , 1 to 11% by weight of Al ₂ O ₃ , 1 to 7% by weight of CaO, aggregates for concrete It is desirable to meet the copper slag aggregate quality standards of KS 2527. Table 1 below is a table comparing the quality standards of fine aggregates for concrete and copper slag fine aggregates.

Item Natural fine aggregate
(KS 2527) Copper slag fine aggregate
(KS 2527) Test result 1) Absolute Dry Density (g / cm 3) 2.5 or more 3.2 and up 3.4 ~ 3.7 2) Absorption rate (%) 3.0% or less 2.0 or less 0.2-0.5 3) Sodium sulfate stability (%) below 10 - 1.2 4) particle size Standard particle size Standard particle size Standard particle size 5) Unit volume mass (kg / L) - 1.80 or more 2.24 6) Pest content
① Clay mass (%)
② 0.08mm passing amount (%)
-When subjected to surface wear
-In other cases
③ Chloride (NaCl equivalent,%)
1.00 or less

3.0 or less
5.0 or less
0.04 or less
-

-
-
0.03 or less
0.5

0.3
0.3
0.005 7) alkali aggregate reaction Harmless Harmless Harmless

In the case of the concrete water pipe according to the present invention, by using the electric furnace copper slag as a fine aggregate with a very low absorption rate of 0.5% or less and very high strength in the concrete composition constituting the water pipe can reduce the number of formulations compared to conventional water pipe formulation Since it is possible to manufacture a concrete solidified body of a more compact structure has the advantage that it is possible to secure long-term durability performance, such as freeze-thaw resistance, along with reduced dry shrinkage and increased mechanical strength.

In addition, in the present invention, by applying an organic-inorganic hybrid thickener to the concrete composition, it prevents the material separation generated when wet-vibration molding a concrete mixture using a large amount of copper slag with low absorption rate and high density electric furnace and excellent formability of the water pipe Securing effect will be exerted.

Therefore, if the concrete channel can be produced according to the present invention, it is possible to make a large amount of copper copper slag as fine aggregate, so it is possible to produce a concrete channel of the improved performance, and to reduce the environmental load for natural damage by greatly reducing the amount of natural aggregate used There are advantages to it.

Hereinafter, preferred embodiments of the present invention will be described. However, this is to be described as an embodiment, by which the technical spirit of the present invention and its core configuration and operation are not limited.

In the present invention, in the production of the concrete composition for producing the concrete water pipe and the concrete water pipe using the same, the effect of reducing the water / cement ratio due to the low absorption rate and high strength and thereby securing a compressive strength equal to or higher than the existing water pipe Electric furnace copper slag is used as fine aggregate, and organic-inorganic hybrid thickener that can secure material and prevent material separation due to high density and low absorption rate of copper slag fine aggregate during wet vibration molding of water pipe.

Specifically, the concrete composition according to the present invention includes a binder, aggregate (coarse aggregate and coarse aggregate), and cement-based binder, and further includes copper slag fine aggregate as an aggregate. In particular, in the concrete composition of the present invention, the copper slag fine aggregate is contained in an amount of 20 to 50% by weight, preferably 30 to 50% by weight, and more preferably 40 to 50% by weight, based on the total concrete composition.

In addition, the concrete composition of the present invention further comprises an organic-inorganic hybrid thickener, the organic-inorganic hybrid thickener is contained in 0.5 to 1.0% by weight when the cement-based binder is 100% by weight.

Organic-inorganic hybrid thickeners do not show an immediate thickening effect in concrete mixing, but rather a delaying time when the thickening effect occurs because of the thickening effect after the water-soluble polymer is dissolved. Since this time can be used to mix the concrete materials, the thickening effect appears in earnest after the concrete materials are sufficiently mixed, resulting in effective prevention of material separation during wet vibration molding.

Furnace copper slag fine aggregate contained in the concrete composition of the present invention is a slag powder or aggregate type slag generated in the process of smelting the raw stone in the electric furnace to produce copper (grain) suitable for the fine aggregate for concrete aggregate It is preferably crushed in accordance with KS quality standards (KS F 2527 concrete aggregate).

Mohs hardness obtained by quenching slag generated in the process of smelting copper ore in an electric furnace is 6 ~ 7, which has high strength and high dissolution characteristics and chemical reactivity, which is higher than concrete using the same general aggregate. And the durability can be obtained.

In addition, since the copper slag fine aggregate is made of amorphous glassy with chemically stable surface, the absorption rate is remarkably low, and thus the amount of mixed water can be lowered during concrete production. When the amount of mixed water is reduced in the concrete mixture of the same water / cement ratio, the amount of cement used is reduced, and the voids in the hardened concrete after curing are reduced, which makes it possible to manufacture hardened concrete hardened body, which improves strength and increases long-term durability. It becomes possible.

In the case of the concrete composition according to the present invention, as mentioned above, the furnace copper slag fine aggregate having the above properties is further included, wherein the furnace copper slag fine aggregate, if the weight of the total concrete composition is 100% by weight, The weight of the copper slag fine aggregate contained therein is 20 to 50% by weight, preferably 30 to 50% by weight, more preferably 40 to 50% by weight.

The concrete water pipe made of the concrete composition of the present invention exhibits an advantageous effect in terms of performance, such as an improved compressive strength compared to the existing water pipe by reducing the mixing water due to the excellent hardness and low water absorption of the copper copper slag.

If the content of copper slag fine aggregate in the concrete composition is less than 20% by weight based on the total weight of the total concrete composition, the water pipe product is manufactured by wet vibration molding by simply replacing natural aggregate with copper slag fine aggregate without any description. However, if the copper slag fine aggregates in excess of 20% by weight relative to the total weight of the total concrete composition, material separation inevitably occurs during wet vibration forming, making it difficult to manufacture a normal water pipe product.

Concrete water channel made of the concrete composition of the present invention, while applying the yumugi hybrid thickener exhibits the desired compressive strength and excellent durability, the electric copper slag aggregate up to 50% by weight relative to the total weight of the total concrete composition When exhibited, it shows the compressive strength and durability as water pipes.

On the other hand, if the copper slag fine aggregate is contained in excess of 50% by weight relative to the total weight of the total concrete composition, the very low slump makes it impossible to form wet vibration of the product and the problem of insufficient strength and reduced durability Will occur.

The present invention is a vibrating surface of the entire concrete composition is very low absorbency and has a very high density of 3.5 ~ 3.8g / ㎠ and the electric vibration copper slag as a fine aggregate when using more than 20% by weight of strong vibration applied when forming a water pipe product As an approach to prevent material separation inevitably generated by the organic-inorganic hybrid type thickener is included.

The separation of materials caused by vibration molding when the copper slag fine aggregate having the above characteristics is used in excess of 20% by weight is a problem that cannot be solved by simply adjusting the water / cement ratio to lower the slump of the concrete mixture, and the copper slag fine aggregate Suitable thickeners should be used in consideration of the low absorption and high density characteristics.

Organic thickeners commonly used in the past include hydroxypropylmethyl cellulose (HPMC), methyl cellulose (MC), polyethylene oxide (PEO), ethyl cellulose (EC), polysaccharide (PS), etc., and are soluble in water. In order to control the homogeneous flow characteristics between the materials by improving the viscosity, there is a physical property limitation in reducing the material separation in the formulation with a large density difference between the materials.

Inorganic thickeners may be used such as metakaolin, silica fume, and the like, depending on the degree of grinding, it increases the viscosity of the mixture when mixed with water, thereby reducing the material separation. There is a limit to increase the viscosity as compared to the organic thickener.

The organic-inorganic hybrid thickener used in the present invention is an organic-inorganic hybrid type thickener which improves the shortcomings of organic and inorganic thickeners, and is due to the change of the aggregate quality used in concrete, the decrease of the amount of cement, the density and the absorption rate of aggregate. A thickener developed to prevent material separation. The basic viscosity of concrete mixture is adjusted by using hydroxypropyl methyl cellulose (HPMC) system which has good viscosity expression in strong alkali atmosphere and polyssacaride system which has excellent side chain structure constraining water molecules. Attapulgite ((Mg, Al) ₅ Si ₈ O ₂₀ .4H ₂ O to solve material separation problems caused by admixtures such as fluidizing agents and air entrainers used to improve workability and reduce the amount of water used. ) It is mixed with mineral type thickener which is composed of mineral and has uniform colloidal dispersion and adsorption characteristics. This inorganic thickener provides excellent thixotropy in ionic or nonionic water systems to prevent sagging and control a wide range of flow characteristics.

The preferred composition of the organic-inorganic hybrid thickener is 70 to 80% by weight of the inorganic component (Attapulgite, (Mg, Al) ₅ Si ₈ O ₂₀ .4H ₂ O) and the organic component of hydroxypropyl methylcellulose (HPMC) It is composed of 5 to 20% by weight and 10 to 15% by weight of polysaccharides (PS), which may further include a strength compensator and an antifoaming agent as necessary.

In the concrete composition of the present invention, the organic-inorganic hybrid thickener is contained in 0.5 to 1.0% by weight relative to 100% by weight of the cement-based binder.

 The organic-inorganic hybrid thickener used in the present invention can prevent material separation of concrete generated by using copper slag fine aggregate having high density and almost no absorbency, and can further improve the formability and mechanical strength of the concrete water pipe. .

 Therefore, if the organic-inorganic hybrid thickener is used, the electric furnace copper slag aggregate amount can be increased while fully exhibiting the required performance of the water pipe for the concrete composition according to the present invention, and the amount of unit cement can be reduced due to the reduction of the mixing water. The advantages of being able to improve the eco-friendliness and economics are exhibited.

If the content of the organic-inorganic hybrid thickener is less than 0.5% by weight in the concrete composition using copper slag fine aggregate in the electric furnace, it is not sufficient to secure the concrete viscosity to prevent material separation of the concrete composition, preventing material separation, Since no improvement in performance and formability can be expected at all, the organic-inorganic hybrid thickener in the present invention must be contained at least 0.5% by weight relative to 100% by weight of the cement binder. In particular, when the organic-inorganic hybrid thickener is contained in 0.5% by weight or more based on 100% by weight of the cement binder, the concrete water channel made of the concrete composition is excellent in formability while showing the desired performance, further improved material separation and performance degradation Development prevention and excellent molding effect are exhibited.

On the other hand, if the content of the organic-inorganic hybrid thickener exceeds 1.0% by weight with respect to 100% by weight of the cement-based binder, it is impossible to secure formability due to the increase in the viscosity of the concrete composition, resulting in poor molding, lack of strength and durability of the concrete channel. The problem of degradation arises.

In the following, the present invention will be described in more detail with reference to Examples. However, the following examples are provided only for the purpose of illustration in order to help the understanding of the present invention, and the scope and scope of the present invention is not limited thereto.

<Examples and Comparative Examples>

Each composition to have the composition as shown in Table 2, Table 3, Table 4 in order to check the overall physical properties and the appropriate range of use, such as strength, slump, material separation of the concrete composition according to the present invention using copper slag and organic-inorganic hybrid thickener After mixing the components and put into a molding mold and vibrating to prepare a cylindrical concrete specimen having a diameter of 100mm, a height of 200mm. The slump and material separation properties of the unconsolidated concrete were evaluated from the test body. Meanwhile, the prepared test body was cured in a standard ecology of water for 28 days after demolding, and the compressive strength was measured.

First, in order to grasp the strength characteristics and slump, material separation and compressive strength according to the mixing amount of copper slag fine aggregate in the total mixture in the concrete composition according to the present invention to prepare a test body by combining the Examples and Comparative Examples summarized in Table 2 And physical properties thereof were measured. Aggregate was used in the standard state and the water / cement ratio was 50%.

Item Quantity of material per unit of water pipe 300C (kg) Copper slag mixing
Mass ratio
(%)
slump
(cm)
material
Separation compression
burglar
(MPa)
(28 days)
water
cement Fine aggregate natural
Coarse aggregate natural
Fine aggregate Copper slag
Fine aggregate Comparative Example 1 30.0 60.0 110.0 0 165.0 0 8.8 none 41.1 Example 1 30.0 60.0 73.5 36.5 165.0 10 9.2 none 37.3 Example 2 30.0 60.0 37.0 73.0 165.0 20 14.5 Occur 26.4 Example 3 30.0 60.0 0.5 109.5 165.0 30 19.1 Occur 21.7 Example 4 30.0 60.0 0 146.0 129.0 40 17.5 Occur 28.6 Example 5 30.0 60.0 0 182.5 92.5 50 14.8 Occur 27.8 Example 6 30.0 60.0 0 219.0 56.0 60 5.4 none 20.4

As summarized in Table 2 above, in the case of Comparative Example 1, as a general compounding ratio used for the production of existing concrete water pipes, it is a formulation using only natural fine aggregates without containing copper slag fine aggregates at all, and Examples 1 to 6 Natural aggregates were replaced in order for the content of copper slag fine aggregate to be 10 wt%, 20 wt%, 30 wt%, 40 wt%, 50 wt%, 60 wt% with respect to the entire concrete composition.

<Slump, material separation and compressive strength evaluation>

There is no specific standard of workability that can be vibrated for concrete water pipes, but in general, the slump value is used as a workability standard, and a suitable slump value range is preferably about 8 to 10 cm. In addition, since the reinforcing bar is disposed inside the mold when forming the water pipe, the cement paste and aggregate in the concrete should be evenly distributed between the reinforcing bars during the vibration forming, so that the strength is improved after the hardening of the concrete.

Material separation evaluation method is to evaluate the slump test in the case of concrete, and then to evaluate the treatment. First, as a result of the slump test, as shown in 3) of Figure 1, it is evaluated that material separation occurs when a relatively large slump occurs or when concrete falls down to one side. In this case, cement paste leaks around the slump cone, which also causes material separation.

' 상태로 진동 성형하게 되는데 이때 콘크리트 혼합물의 슬럼프가 높게 되면 동슬래그 골재의 낮은 흡수율과 고밀도로 인한 블리딩과 재료 분리가 발생하게 되어 수로관 제품의 파괴하중 강도를 측정하는 하부면(성형시 상부면) 콘크리트의 단면두께 감소 및 강도가 취약해져 제품 불량의 주원인이 된다.In particular, in the case of water pipe products,

When the slump of the concrete mixture becomes high, bleeding and material separation occur due to the low absorption rate and high density of the copper slag aggregate, and the lower surface (the upper surface during molding) to measure the breaking load strength of the water pipe product. The reduction of the cross-sectional thickness and the weak strength of concrete are the main causes of product defects.

The compressive strength standard of reinforced concrete water pipes is defined as 24 MPa or more in the group standard SPS-KCIC-0002-1955: 2017. However, in the present invention, considering that the concrete water pipes are used on the waterfront and in water, they are compressed to ensure the stability of the concrete compressive strength. An appropriate strength standard was 28.8 N / mm 2 or more, which was 1.2 times the strength standard.

As can be seen in Table 2, Comparative Example 1, Example 1 has a slump range of 8.5 ~ 9.25cm, there is no material separation, the compressive strength of 41.1MPa, 37.3MPa, respectively, the use of copper slag 10% by weight or less Until now, it can be used without technical difficulties.

In Examples 2 to 5, as the amount of copper slag used in the electric furnace increases from 20% to 50% by weight, the cement paste and the aggregate in the concrete composition are not satisfied while the desired slump value is not satisfied. Material separation was confirmed, and the compressive strength was less than the standard value of 28.8 N / ㎠. This is due to the increase in the use of copper slag with high density and low absorption rate, causing the aggregate to settle during vibration, and to increase the slump due to the relative increase in the amount of excess compound in the mixture.

On the other hand, in the case of Example 6 using the copper slag fine aggregate 60% by weight, the sudden decrease in slump showed poor moldability and the compressive strength criteria were not met.

Therefore, when the amount of copper slag aggregates used in the mixing of the concrete mixture for the water pipe was less than 10% by weight of the total concrete composition, it was possible to use it without significant problems. A technical solution to improve slump, material separation, and compressive strength is essential.

<Water / cement ratio adjustment>

From the results of Table 2, as a part of the solution to improve the slump, material separation, and compressive strength problems of the concrete mixture generated when using a large amount of copper slag fine aggregates by adjusting the water / cement ratio of the concrete mixture as shown in Table 3 It was confirmed whether the problem was improved.

Item Quantity of material per unit of water pipe 300C (kg) Copper slag mixing
Mass ratio
(%) Water-cement
ratio(%) slump
(cm) material
Separation compression
burglar
(MPa)
(28 days) water cement Fine aggregate natural
Coarse aggregate natural
Fine aggregate Copper slag
Fine aggregate Comparative Example 2 30.0 60.0 0.5 109.5 165.0 30 50 19.1 Occur 21.7 Comparative Example 3 30.0 60.0 0 146.0 129.0 40 17.5 Occur 28.6 Comparative Example 4 30.0 60.0 0 182.5 92.5 50 14.8 Occur 27.8 Example 7 27.0 60.0 0.5 109.5 165.0 30 45 16.5 Occur 30.8 Example 8 27.0 60.0 0 146.0 129.0 40 14.6 Occur 31.4 Example 9 27.0 60.0 0 182.5 92.5 50 11.3 Occur 33.8 Example 10 24.0 60.0 0.5 109.5 165.0 30 40 14.4 Occur 26.2 Example 11 24.0 60.0 0 146.0 129.0 40 12.2 Occur 25.2 Example 12 24.0 60.0 0 182.5 92.5 50 10.1 Occur 26.3

As can be seen in Table 3, the water / cement ratio of the concrete mixture using 30 to 50% by weight of copper slag fine aggregate was 45% and 40% as in Examples 7 to 12 in 50% of Comparative Examples 2 to 4. Experimental results showed that the slump and compressive strength tended to improve somewhat in some examples, but it was found that there is a limit in improving the overall slump, material separation and compressive strength of the concrete mixture by simply adjusting the mixing water.

< Thickener  Addition>

From the results of Tables 2 and 3, the concrete mixture of Comparative Example 5 as shown in Table 4 as part of the technical solution to improve the problems of slump, material separation, insufficient compressive strength of the concrete mixture generated when using a large amount of copper slag fine aggregates Mixing of the organic-inorganic hybrid thickener 0.5% by weight, 1.0% by weight, 1.5% by weight of the amount of cement in Examples 12 to 14 in the formulation to improve the effect and the appropriate amount of use range of the problem according to the change in the amount of thickener used Confirmed. The organic-inorganic hybrid thickener 75% by weight of the inorganic component (Attapulgite, (Mg, Al) ₅ Si ₈ O ₂₀ .4H ₂ O) and 15% by weight of the organic component of hydroxypropyl methylcellulose (HPMC) and poly One consisting of 10% by weight saccharide (PS) was used.

In Comparative Example 5, the water / cement ratio was 45% based on the analysis results in Tables 2 and 3, and the amount of copper slag used in the electric furnace was 45% by weight of the entire concrete mixture.

Item Quantity of material per unit of water pipe 300C (kg) Copper slag mixing
Weight ratio
(%)
Water-cement
ratio(%)
slump
(cm)
material
Separation compression
burglar
(MPa)
(28 days) water cement Fine aggregate natural
thick
aggregate Thickener
(Cement weight%) natural
Fine aggregate Copper slag
Fine aggregate Comparative example
5 27.0 60.0 0 164.2 110.8 0 45 45 14.6 ~
12.3 Occur 31.4 ...
30.8 Example
13 27.0 60.0 0 164.2 110.8 0.5 45 45 9.3 none 35.7 Example
14 27.0 60.0 0 164.2 110.8 1.0 45 45 7.8 none 38.5 Example
15 27.0 60.0 0 164.2 110.8 1.5 45 45 5.2 none 40.3

As a result of measuring the slump for the workability of the concrete composition of Comparative Example 5 and Examples 13 to 15 summarized in Table 4, the concrete composition prepared according to Examples 13 to 15 was compared with Comparative Example 5. As the content of the organic-inorganic hybrid thickener increased, the slump value was gradually decreased, and the concrete composition prepared according to Examples 13 to 14 was 8 to 10 cm, which is the most preferable slump value required for forming concrete water pipes. It can be seen that satisfactory.

In addition, referring to the results of the aggregate separation with the naked eye, it can be confirmed that the concrete composition prepared in Examples 13 to 15 was not separated from the cement paste and the aggregate.

The compressive strength is considerably increased compared to Comparative Example 5 in Examples 13 to 15, which is due to the strength compensator component included in the organic-inorganic hybrid thickener in addition to the prevention of material separation according to the appropriate slump.

However, in the case of the Example 15 mixture prepared by using the thickener 1.5% by weight of cement, the prepared concrete composition had a low slump value of 5.2 cm, which was too high in viscosity to give a desirable slump value for vibration forming of the water pipe. Unsatisfactory was confirmed. Therefore, the appropriate amount of the organic-based hybrid thickener applied to the present invention is preferably 0.5% to 1.0% by weight of the cement weight.

In the same manner as in Examples 13 and 14, copper slag is used in an amount of 45% by weight of the entire concrete mixture, 45% by weight of water / cement ratio is used, and 0.5 to 1.0% by weight of the organic / inorganic hybrid thickener is added to the cement weight. The excellent workability, material separation prevention and compressive strength improvement were confirmed in the manufactured concrete.

<Site Prototype Manufacturing>

As summarized in Table 4 above, the optimum range for the water / cement ratio, the content of copper slag fine aggregate, and the content of the organic-inorganic hybrid thickener were derived based on various test results. By using the formulation of Example 16, the reinforcing water pipe of the nominal 300 (Length (L) value 250mm) suggested by the group standard (SPS-KCIC-0002-1955: 2017) was applied by applying the field manufacturing equipment and the manufacturing process as it is. After the prescribed curing to obtain strength in accordance with the group standard, the material separation occurred and the flexural failure load was measured for the waterway tube prototype after curing was completed.

Item Quantity of material per unit of water pipe 300C (kg) Copper slag
incorporation
Weight ratio
(%)
Water / cement ratio
(%)
Flexural failure
weight
(kN)
material
Separation water cement Fine aggregate natural
Coarse aggregate Thickener
cement
(weight%) natural
Fine aggregate Copper slag
Fine aggregate Example 16 24.3 54.0 0 164.2 110.8 0.75 45 45 131.2 none

The flexural failure load of the nominal 300 (span (L) value 250mm) of the reinforced water pipe specified in the group standard (SPS-KCIC-0002-1955: 2017) is specified to be 95.0 kN or more, and it is preferable to satisfy this.

As a result of measuring the flexural failure load of the concrete water pipe test specimens manufactured on-site by the formulation of Example 16 summarized in Table 5 above, a value of 131.2 kN was shown, which is the bending of the reinforcement water pipe of nominal 300 among reinforced concrete water pipes. The failure load standard was found to greatly exceed 95.0 kN, which is the criterion failure load standard of SPS-KCIC-0002-1955: 2017.

 Concrete water pipe according to the present invention is made of the concrete composition of the present invention described above, the size and shape of the concrete water pipe can be freely determined as needed. Since the concrete water pipe according to the present invention is made of the concrete composition of the present invention described above, has the same useful advantages that the concrete composition of the present invention has the same bar, excellent workability, excellent compressive strength, flexural fracture load It has long-term and long-term durability, and has long-term and eco-friendly advantages of natural resource conservation through resource recycling.

As a concrete example of the concrete product using the concrete composition according to the present invention, the concrete waterway pipe is presented, but the concrete composition according to the present invention is not used only for the production of such concrete waterway pipes, the production of concrete products for various other purposes It can also be used.

Claims (6)

In the concrete composition comprising a binder water, aggregate and cement-based binder,
It further includes copper slag fine aggregate and organic-inorganic hybrid thickener,
The copper slag fine aggregate is contained in 40 to 50% by weight based on the total concrete composition,
The water / cement ratio of the bonding water and cement-based binder is 40 ~ 45%,
The organic-inorganic hybrid thickener is included in the 0.5 to 1.0% by weight when the cement binder is 100% by weight, attapulgite (Attapulgite, (Mg, Al) ₅ Si ₈ O ₂₀ .4H ₂ O) 70 ~ 80% by weight Hydroxypropyl methylcellulose (HPMC) 5 to 20% by weight, polysaccharide (PS) 10 to 15% by weight,
The slump value is 8 ~ 10cm, characterized in that the composition for the concrete water pipe for wet vibration molding using copper slag fine aggregate.
delete delete delete The method of claim 1,
The copper slag fine aggregate is a wet vibration, characterized in that the slag powder or aggregate form slag generated in the process of smelting the raw stone in the electric furnace to manufacture copper to a standard particle size of the aggregate fine aggregate for concrete Composition for concrete water pipe for molding
In the concrete water pipe,
The concrete waterway pipe, characterized in that produced by molding the concrete composition of claim 1 by a wet vibration method.