KR20010104765A - The method for manufacturing and composition for height-intensity concrete compound - Google Patents

Abstract

In the present invention, 2 to 20 parts by weight of sulfur wood (dry sludge) and 2 to 15 parts by weight of anhydrous gypsum are added to 100 parts by weight of Portland cement, and 110 to 230 parts by weight of sand and 150 to 280 parts by weight of coarse aggregate are added to 20 to 35 parts by weight of water. And it relates to a method for producing a high-strength concrete mixture composition for steam curing using α'- C ₂ S produced by using a high performance AE water reducing agent 1.0 to 2.0 parts by weight of cement.

Description

The method for manufacturing and composition for height-intensity concrete compound}

The present invention relates to a method of manufacturing a high strength concrete composition honhapjae steam curing with α'- C ₂ S, C ₂ S α'- cooling, 5 to 60 parts by weight of the crushed composition anhydrite 40 to 95 wt. The present invention relates to a method for producing a high-strength concrete mixture composition for steam curing using α′-C ₂ S for the high-strength expression and the reduction of manufacturing cost in the manufacture of concrete by micronizing and mixing the mixture containing parts with cement.

Recently, the design strength of building structures has been greatly increased as the scale of construction works has increased in size and height, and high strength concrete and steel structures are urgently required.

Currently, high strength concrete or high strength concrete piles are prepared by mixing silica fume, meta kaolin, CAS-based clinker, and gypsum-based cement. However, these mixtures are very expensive and act as a factor that adds a burden to the manufacturing industry, the construction industry, and the civil engineering industry. Recently, blast furnace slag, which is Publication No. 96-37607 and Publication No. 1999-026564, is used as a high strength mixture using steel blast furnace slag, but it is required to develop a low strength and good strength mixture in terms of strength.

Therefore, the present invention was developed in consideration of the above problems, the present invention relates to a high-strength mixture for concrete, 40 ~ 95 parts by weight of anhydrous gypsum and α ＇-C ₂ S cold crushing, screening (wet) grinding A high-strength mixture for steam curing, in which a high-strength mixture containing 5 to 60 parts by weight of a composition is pulverized to a particle size of about 6,000 to 10,000 cm 2 / g. It is an object of the present invention to provide a method for preparing a high strength concrete mixture composition for steam curing using α′-C ₂ S, which is very useful in terms of environmental protection, by using sulfur wood (gun sludge), which is a waste byproduct in a production blast furnace.

1 is atmospheric steam curing conditions

Figure 2 is a device analysis (XRD) results of the chemical composition of the high-strength mixture

3 is a relative dynamic modulus diagram of concrete added with PLAIN and high strength mixture

In order to achieve the above object, the present invention is 100 parts by weight of Portland cement, 2 to 20 parts by weight of sulfur wood (gun sludge), 2 to 15 parts by weight of dry gypsum, 110 to 230 parts by weight of sand, coarse aggregate 150 ~ 280 It relates to a high-strength concrete mixture composition for steam curing using α'- C ₂ S, characterized in that the composition by weight, 20 to 35 parts by weight of water, 1.0 to 2.0 parts by weight of a high performance AE water reducing agent, and a method for producing the same.

The present invention is made by spraying water to the sulfur wood (gun sludge) Busan by the electric furnace for stainless steel production in Pohang Iron & Steel Co., Ltd. made after cooling the wet sludge dry and pulverized sulfur wood (gun sludge) 5 ~ 60 weight It is a high-strength mixture of steam curing cement which is a powdered mixture containing 40 to 95 parts by weight of gypsum and anhydrous gypsum, and the strength expression mechanism in concrete production is as follows.

1. The composition of the active α＇-C ₂ S to produce a CSH hydrate, thereby densifying the structure of the cured body to increase the strength.

Compounding material in the production of high strength concrete pile is as follows.

Portland Cement: Powder Level 3,150㎠ / g

High strength mixed material (Hwangmoksa (Gun Sludge) + Anhydrous Gypsum): Powder level 8,000㎠ / g

·sand

Coarse aggregate

High performance AE water reducing agent (Superplasticizing Air Entrainning Agent)

Table 1 below shows the chemical composition of the raw materials for producing a high strength mixture.

<Table 1> Chemical Composition of Hwangmoksa (Gun Sludge) and Anhydrous Gypsum

specimen SiO ₂ Al ₂ O ₃ Fe ₂ O ₃ CaO MgO SO ₃ Ig-loss Hwangmoksa (Gun Sludge) 29.60 1.39 - 54.94 7.23 - Anhydrous gypsum 0.84 0.47 0.21 40.38 0.20 55.07 1.16

As shown in FIG. 2, the composition of Hwangmoksa (gun sludge), which is the main raw material of the high-strength mixture, was confirmed to be composed of α＇-C ₂ S.

Atmospheric steam curing conditions of the present invention is as shown in Figure 1 as the natural air cooling after the pretreatment 35 ℃ / 3hr, elevated temperature 17 ℃ / 3hr, maintenance 85 ℃ / 5hr.

Hereinafter, the present invention will be described in detail through examples.

Example 1

A high-strength concrete mixture composition for steam curing using α′-C ₂ S, in which 60 kg of Portland cement was mixed with 28 kg of sulfur wood (gun sludge) and 12 kg of anhydrous gypsum, mixed with a mixture having a powder degree of 8,000 cm 2 / g ± 100.

Example 2

A high strength concrete mixture composition for steam curing using α′-C ₂ S was prepared by mixing 11 kg of sulfur wood (gun sludge) and 9 kg of anhydrous gypsum to 80 kg of Portland cement.

Example 3

A high strength concrete mixture composition for steam curing using α′-C ₂ S was prepared by mixing 6 kg of sulfur wood (gun sludge) and 14 kg of anhydrous gypsum to 80 kg of Portland cement.

Example 4

A high-strength concrete mixture composition for steam curing using α′-C ₂ S, in which 90 kg of Portland cement was mixed with 7 kg of sulfur wood (dry sludge) and 13 kg of anhydrous gypsum, was mixed with a mixture having a powder degree of 8,000 cm 2 / g ± 100.

Comparative Example 1

Atmospheric steam curing using only Portland cement to prepare a concrete composition.

Comparative Example 2

A high strength concrete mixture composition was prepared by mixing 20 kg of blast furnace slag and anhydrous gypsum in 80 kg of portland cement.

Experimental Example

The compressive strength over time was tested for Examples 1 to 4 and Comparative Examples 1 and 2.

<Table 2> Mortar Properties in Atmospheric Steam Curing

No Portland Cement (wt%) High strength mixed material (% by weight) Compressive strength (㎏f / ㎠) Remarks Hwangmoksa (Gun Sludge) Anhydrous gypsum 1 day 3 days 7 days Comparative Example 1 100 - - 482 552 604 Example 1 60 28.00 12.00 627 744 786 Example 2 80 11.00 9.00 568 635 692 Example 3 80 6.00 14.00 612 694 767 Comparative Example 2 80 20.00 594 676 736 Example 4 90 7.00 13.00 602 685 740

In the present invention, it was found that Example 1, which is 60 parts by weight of Portland Cement-Hangmok yarn (gun sludge) and 40 parts by weight of anhydrous gypsum, had the highest compressive strength. The compressive strength was found to be high at 1 day, 3 days and 7 days.

In addition, in the case of Example 4, 90 parts by weight of Portland Cement-Hwangmoksa (gun sludge) and 10 parts by weight of anhydrous gypsum, although the addition amount is much lower than Comparative Example 2, it can be seen that it is excellent in compressive strength.

Example 5

95 kg of Portland cement was mixed with 5 kg of sulfur wood (dry sludge) to prepare a high strength concrete mixture composition for steam curing using α′-C ₂ S.

Example 6

A high strength concrete mixture composition for steam curing using α′-C ₂ S was prepared by mixing 8 kg of sulfur wood (gun sludge) in 92 kg of portland cement.

Example 7

90 kg of Portland cement was mixed with 10 kg of sulfur wood (gun sludge) to prepare a high strength concrete mixture composition for steam curing using α′-C ₂ S.

Example 8

15 kg of Hwangmoksa (gun sludge) was mixed with 85 kg of Portland cement to prepare a high strength concrete mixture composition for steam curing using α′-C ₂ S.

Comparative Example 3

A high-strength concrete mixture composition was prepared by mixing 5 kg of a conventional high-strength mixture product in which blast furnace slag and anhydrous gypsum were mixed with 95 kg of portland cement.

Comparative Example 4

A high strength concrete mixture composition was prepared by mixing 8 kg of a conventional high strength mixture product in which blast furnace slag and anhydrous gypsum were mixed with 92 kg of portland cement.

Comparative Example 5

A high-strength concrete mixture composition was prepared by mixing 10 kg of a conventional high-strength mixture product in which blast furnace slag and anhydrous gypsum were mixed with 90 kg of portland cement.

Comparative Example 6

A high-strength concrete mixture composition was prepared by mixing 15 kg of blast furnace slag and 15 kg of a conventional high strength mixture product mixed with 85 kg of portland cement.

Experimental Example 2

Paste condensation test according to the addition amount of the high-strength mixture for Examples 5 to 8 and Comparative Examples 1, 3 to 6 was carried out as follows and the results are shown in Table 4.

<Table 4> Condensation test

Portland Cement (wt%) High strength mixed material (% by weight) LED (W / C) Setting time First (h: m) Termination (h: m) Hwangmoksa (Gun Sludge) Conventional products Comparative Example 1 100 - - 0.260 3:30 5:10 Example 5 95 5 - 0.260 3:25 5:00 Example 6 92 8 - 0.260 3:35 5:10 Example 7 90 10 - 0.265 3:30 5:05 Example 8 85 15 - 0.265 3:25 5:10 Comparative Example 3 95 - 5 0.250 3:43 5:13 Comparative Example 4 92 - 8 0.255 3:33 5:20 Comparative Example 5 90 - 10 0.255 3:20 5:20 Comparative Example 6 85 - 15 0.260 3:30 5:00

The condensation test of the high strength mixture of the present invention was carried out in comparison with the conventional high strength mixture in accordance with KS L 5102, 5103.

As a result of the coagulation test of the high strength mixture, it was found that the same tendency as the conventional high strength mixture.

Example 9

Portland cement 513kg of sulfur pastor (s sludge) mixed with 9.47kg and 17.55kg anhydrite, and then mixed with water 127kg, sand 582kg, 1,228kg aggregate and high-performance AE water reducing agent 9,72kg using α'- C ₂ S A high strength concrete mixture composition for steam curing was prepared.

Example 10

469.8kg Portland cement sulfur pastor (s sludge) 15.12kg and 28.08kg then mixed with anhydrite, the α'- C ₂ S is mixed with water 127kg, sand 582kg, 1,228kg aggregate and high-performance AE water reducing agent 9,72kg A high strength concrete mixture composition for steam curing was prepared.

Example 11

486kg Portland cement 18.9kg Hwangmoksa (gun sludge) and 35.1kg anhydrous gypsum, then 127kg water, 582kg sand, 1,228kg coarse aggregate and 9,72kg high-performance AE water reducing agent to mix using α'- C ₂ S A high strength concrete mixture composition for steam curing was prepared.

Example 12

Portland cement 459kg of sulfur pastor (s sludge) mixed with 28.35kg and 52.65kg anhydrite, and then mixed with water 127kg, sand 582kg, 1,228kg aggregate and high-performance AE water reducing agent 9,72kg using α'- C ₂ S A high strength concrete mixture composition for steam curing was prepared.

Comparative Example 7

A cement composition was prepared by mixing 540 kg of Portland cement with 127 kg of water, 582 kg of sand, 1,228 kg of coarse aggregate, and 9,72 kg of high performance AE water reducing agent.

Comparative Example 8

A high strength mixture composition was prepared by mixing 108 kg of a conventional high strength admixture with 440 kg of Portland cement, then mixing 127 kg of water, 582 kg of sand, 1,228 kg of coarse aggregate, and 9,72 kg of a high performance AE water reducing agent.

Experimental Example 3

The freezing and thawing of Example 11 and Comparative Example 7 were performed as follows, and the experimental results are shown in Table 5.

<Table 5> Concrete mix ratio for freeze-thawing test using high-strength mixture

No cement High Strength Mixture water sand Pebble High performance AE water reducer Remarks Gun Hwang Sludge Anhydrous gypsum One 540 - - 127 582 1228 9.72 - 2 486 18.9 35.1 127 582 1228 9.72 High Strength Mixture

Figure 2 shows the relative dynamic modulus of elasticity of the concrete added PLAIN and high-strength mixture, Figure 2 shows the relative dynamic modulus to determine the freeze-melt durability of the concrete applied to PLAIN and high-strength mixture 10%. When the water freezes, 9% of volume expansion occurs. When the water in the voids freezes, a volume expansion pressure is generated. When the water is above a certain pressure, the concrete surface is destroyed. As can be seen in Figure 2, the concrete to which the present invention was applied showed better freeze-thawing resistance than PLAIN. This suggests that α′- C ₂ S of active sulfuric acid (gun sludge) is free of C ₃ A ?? 3CaSO, which is denser in concrete structure due to the generation of large amount of CSH hydrate and ethrinzite is the main cause of freezing and thawing. ₄ ?? 32H ₂ O This may be due to the fixing of water molecules.

Experimental Example 4 (Permeability Test)

Table 6 shows the results of permeability characteristics test by mortar method when PLAIN and the present invention were added 10%.

Table 6.Permeability Characteristics

division Permeability (% PLAIN) PLAIN 100 High Strength Mixture 83

When the product of the present invention was added, the water permeability was small at 83%, which is 17% lower than PLAIN. This is because, as mentioned above, the structure of the concrete when the present invention is added is more dense than PLAIN, and water penetration is difficult.

As a result of the above experiment, the present invention generates a large amount of hydrate by reacting with cement to fill the pores in the concrete to densify the tissue to express durability and high strength.

Experimental Example 5

The compressive strengths of Examples 9 to 12 and Comparative Examples 7 and 8 were tested as follows, and the results are shown in Table 7.

〈Table 7〉 High strength pile properties according to the amount of high strength mixture added

(Unit: ㎏ / ㎥)

No cement High Strength Mixture water sand Coarse aggregate High performance AE water reducer Compressive strength (㎏f / ㎠) Remarks Dry sludge Anhydrous gypsum 1 day 3 days 7 days Comparative Example 7 540 - - 127 582 1228 9.72 650 700 760 Example 9 513 9.45 17.55 127 582 1228 9.72 730 780 820 Example 10 496.8 15.12 28.08 127 582 1228 9.72 790 830 890 Example 11 486 18.9 35.1 127 582 1228 9.72 810 870 910 Example 12 459 28.35 52.65 127 582 1228 9.72 810 860 880 Comparative Example 8 440 108 127 582 1228 9.72 760 810 860

As shown in Table 7, the present invention was found to be very high in comparison with the concrete pile formed of only Portland cement in 1, 3 and 7 days of compressive strength. In addition, the highest compressive strength in Example 11 was excellent as a result of the substitution amount of high-strength mixtures, and Examples 10 and 12 were higher than those of Comparative Example 8 except for Comparative Examples 7 and 9.

As described above, according to the composition of the present invention, as shown in various embodiments, it was superior to the conventional high-strength mixture in high-strength implementation and durability. Could know.

In addition, the composition of the present invention is determined to be very useful for environmental protection by using the waste by-product Hwangmoksa (gun sludge).

Claims (3)

In the method for producing a high strength mixture composition of steam curing cement, 2 to 20 parts by weight of sulfur wood (dry sludge) and 2 to 15 parts by weight of dry gypsum are added to 100 parts by weight of Portland cement, and 110 to 230 parts by weight of coarse aggregate 150 20 to 35 parts by weight of water is added, and a high-performance AE water reducing agent is prepared by using 1.0 to 2.0 parts by weight of cement. The method according to claim 1, wherein the mixture has a particle size of about 8,000 cm 2 / g ± 100 of the powder degree. In the high-strength mixture composition of steam curing cement, 100 parts by weight of Portland cement, 2 to 20 parts by weight of sulfur wood sand (dry sludge), 2 to 15 parts by weight of dry gypsum, 110 to 230 parts by weight of sand, 150 to 280 weights of coarse aggregate Part, 20 to 35 parts by weight of water, 1.0 to 2.0 parts by weight of high-performance AE water reducing agent composition for high-strength concrete mixture for steam curing.