KR100654320B1 - The making method of polymer cement concrete pipe - Google Patents

Abstract

The present invention relates to a polymer cement concrete fume pipe manufactured by incorporating a polymer dispersion or re-emulsified powder resin, etc., which can improve cement properties in cement concrete. As a cement concrete admixture, after mixing 1-30 parts by weight of the aqueous polymer dispersion and re-emulsified powder resin, which are widely used in the market, as solids with respect to the weight of cement, curing is performed by steam curing like the existing cement concrete fume pipe. At this time, curing temperature is to be 80 ℃ or less. Depending on the type of polymer, after curing, natural curing (air curing 20 ℃) is carried out for 2-3 days, and steam curing (80 ℃) is more than 3 hours or natural curing (air curing, 20 ℃) is 28 days. It relates to a method for producing reinforced concrete fume pipes and compositions thereof.

Description

The manufacturing method of polymer cement concrete pipe and its composition

Figure 1 Polymer Cement Concrete Compressive Strength Diagram

Figure 2 Relative dynamic modulus diagram after freeze-thawing test of polymer cement concrete

Chloride penetration depth diagram of polymer cement concrete

Figure 4 Depth of Neutralization of Polymer Cement Concrete

Figure 5 After the sulfur phase solution immersion of polymer cement concrete, weight loss rate chart

Fig. 6 Relative compressive strength chart after sulfur phase solution immersion of polymer cement concrete

The present invention is to extend the life of the existing reinforced concrete fume pipe, and a method and a composition for producing a polymer cement concrete fume pipe is prepared by incorporating a polymer dispersion or re-emulsified powder resin that can improve the cement properties in the cement concrete It is about.

In general, concrete that contains polymer dispersion or re-emulsified powdered resin in cement concrete is called "polymer cement concrete".

Cement concrete fume pipe products are most commonly used as sewage pipes because they are more durable than other materials in terms of economy. However, these fume pipes are deteriorated due to deterioration due to household sewage and various industrial wastewater. In general, hydrogen sulfide generated from organic matter contained in wastewater and waste water is sulfated by aerobic bacteria, which deteriorates the surface of reinforced concrete fume pipes, which greatly shortens the service life. In addition, deterioration of the winter sea in winter due to contact with sewage underground can also be a major cause of deteriorating the performance of concrete fume pipes.

In the United States, Europe and Japan, concrete fume pipes are made of polymer concrete, and in this case, the life expectancy can be greatly extended by securing perfect anticorrosive performance. However, in Korea, considering the economical aspects of facility facilities and the concrete itself. It should be thoroughly reviewed.

Therefore, the use of polymer dispersion and re-emulsified powder resin that can greatly improve the performance of existing cement concrete will not only improve the performance of the existing reinforced concrete fume pipes, but also increase the cost significantly compared to polymer concrete. It is also economically advantageous.

Cement admixture polymer hydrates the cement and forms the polymer at the same time to form a composite matrix having a network structure and effectively works at the interface of cement particles to improve workability. As a result, water resistance, chemical resistance, freeze-thawing resistance, and neutralization resistance are improved.

In order to solve the problems described above, the present invention is made of a polymer cement concrete produced by mixing polymer dispersion and re-emulsion type powder resin into cement concrete, which is made of reinforced concrete fume pipes of the fume pipes used as sewage pipes. It is a technical object of the present invention to provide a method and a composition for producing a polymer cement concrete fume pipe which increases the strength, chemical resistance and resistance to winter damage in winter to extend the life of existing reinforced concrete fume pipes.

In order to achieve the above object, the present invention is cement 350kg, polymer acrylic emulsion-based pure acrylic (PA) 17.2-51.0kg, antifoaming agent silicone emulsion-based 0.3 ~ 0.6kg, water 141 ~ 179kg, fine aggregate 752 ~ 758 The polymer cement concrete composed of ㎏, coarse aggregate 955 ~ 963㎏ is produced, manufactured by the normal cement concrete fume pipe manufacturing method, and then steam curing (under 80 ℃) method as the conventional cement concrete fume pipe, and the type of polymer According to the method and composition of the polymer cement concrete fume pipe produced by natural curing (air curing, 20 ℃) for 2-3 days, steam curing (80 ℃) for 3 hours or more, or 28 days of natural curing It is about.

As the polymer for cement concrete admixture used in the present invention, it is any compound selected from commercially available water-based powder (polymer dispersion) and re-emulsified powder resin, and the water-based acid powder (polymer dispersion) is SBR (styrene butadiene). Rubber Latex, Styrene Butadien Rubber Latex, PAE (Poly Acrylic Ester), PA (Pure Acrylic), EVA (Ethylene Vinyl Acetate), St / Ac (styrene / acrylic copolymer Styrene-acrylic Copolymer), EP Epoxy Emulsion, Epoxy Emulsion)

Re-emulsified powdered resin EVA (Ethylene Vinyl Acetate, Ethylene Vinyl Acetate), VA / VeoVa (Vinyl Acetate-Vinyl Versatate), MMA / BA (Methyl Methacrylate, Butyl Acrylate) ) Or St / BA (butyl styrene acrylate, Styrene-Butyl Acrylate) was used.

As the cement used in the present invention, portland cement is generally used, and the antifoaming agent uses any one compound selected from polyester-based and polyether-based compounds in silicone emulsion-based and re-emulsified powder resins. In order to control entrained bubbles, cement 350kg, polymer acrylic emulsion-based pure acrylic (PA) 17.2-51.0kg, antifoaming agent silicone emulsion-based 0.3 ~ 0.6kg, water 141 ~ 179kg, fine aggregate 752 ~ 758kg, coarse aggregate 955 ˜963 kg was added.

In general, if the polymer is usually incorporated into cement concrete, the curing method should be different. In the current factory, steam curing is conducted for more than 3 hours after manufacturing. Usually, it is heated above 100 ℃, and when it is heated above 100 ℃, cracks start to occur. Therefore, the present invention has been achieved by inventing that an appropriate temperature should be below 80 ° C.

In addition, if the curing method is carried out in the curing method (20 ℃) for 2-3 days after steam curing (80 ℃ or less) after the curing method, it is a method that can increase the strength by steam curing after the initial curing properly In another way, the method of carrying out the air curing (20 ℃) from the beginning is a feature of the manufacturing method of the present invention.

Hereinafter, the present invention will be described in detail with reference to the following Examples.

Example 1

350 kg of cement and 17.2 kg of pure acrylic (PA) as an acryl emulsion system with polymer for mixing concrete in cement , and 0.3 kg of silicone emulsion system as an antifoaming agent, water 179 kg, fine aggregate 753 kg, and coarse aggregate 957 kg to control air volume. In the same way as the existing cement concrete using the existing reinforced concrete fume pipe manufacturing facility), it is put into a fume pipe mold and molded, and steam curing is performed at 80 ° C or lower like the existing cement concrete fume pipe. Prepared.

Example 2

350 kg of cement and 34.5 kg of pure acrylic (PA) as an acrylic emulsion based polymer for mixing concrete and cement, and 0.5 kg of a silicone emulsion system as an antifoaming agent, water 155 kg, fine aggregate 758 kg, and coarse aggregate 963 kg. Using the existing reinforced concrete fume pipe manufacturing facility, the same method as the production of cement concrete) was put into a mold of a fume pipe, and then molded and cured for 28 days to produce a polymer reinforced concrete fume pipe.

Example 3

350 kg of cement and 51.9 kg of pure acryl (PA) as an acryl emulsion system with polymer for mixing concrete in cement, 0.6 kg of silicone emulsion system as an antifoaming agent, 141 kg of water, 752 kg of fine aggregate, and 955 kg of coarse aggregate to control air volume. In the same way as the existing cement concrete using the existing reinforced concrete fume pipe manufacturing facility), it is put into a fume mold and molded, and then natural curing is performed at 20 ° C. for 1 to 2 days, and the steam curing is below 80 ° C. The polymer reinforced concrete fume tube was manufactured by performing at least 3 hours at.

Examples 4-12

Unit weight (kg / ㎥) Remarks cement Organic compounds Quantity Fine aggregate Coarse aggregate Cement Concrete Admixture Antifoam system Example 1 350 17.2 0.3 17.5 179 753 957 Example 2 34.5 0.5 35.0 155 758 963 Example 3 51.9 0.6 52.5 141 752 955 Example 4 69 One. 70.0 127 749 952 Example 5 17.2 0.3 17.5 173 755 960 Example 6 34.5 0.5 35.0 158 750 953 Example 7 51.9 0.6 52.5 144 744 945 Example 8 69 One 70.0 131 738 937 Example 9 17.2 0.3 17.5 177 747 949 Example 10 34.5 0.5 35.0 166 735 934 Example 11 51.9 0.6 52.5 148 735 934 Example 12 69 One 70.0 134 729 926

The polymer reinforced concrete fume pipe composition of the present invention prepared as described above is cement 350kg, polymer acrylic emulsion-based pure acrylic (PA) 17.2-51.0㎏, antifoaming agent 0.3-0.6kg, water 141-179kg, fine aggregate 752 It can be seen that the composition is composed of ~ 758 kg, coarse aggregate 955 ~ 963 kg .

Experimental Example

In this experiment, polymer cement concrete was prepared using two kinds of acryl emulsion (PA) and styrene butyl acrylate (St / BA). The basic properties of compressive and flexural strengths of the fabricated concrete and polymer composites were investigated.

 Material used

The cement admixture polymer used in this experiment was an acryl emulsion of pure acryl (PA) and styrene / butyl acrylate (St / BA) emulsions, the properties of which are shown in Table 1.

Solid content (%) Viscosity (mPas) pH (20 ℃) Specific gravity (20 ℃) PA-1 46.3 30 8.6 1.04 PA-2 57.8 493 8.3 1.04 St / ac 49 82 7.8 1.01

 Table 1 General Properties of Polymer Dispersion

Polymer cement concrete was prepared according to the compounding table of Table 2, and polymer cement concrete was used as a specimen of Φ10 × 20 cm. After curing the specimens, curing was performed for 2 days (20 ° C, 80% R.H.), 5 days in water (20 ° C), 21 days in air (20 ° C, 50% R.H.), and various tests were performed.

Experimental Example 1 (freeze-thawing test of concrete polymer composite)

The freeze thaw test was carried out using polymer cement concrete specimens in accordance with KS F 2443 (Method for testing the resistance of concrete to rapid freeze thaw). The freeze thaw resistance was measured at 30 cycles.

Experimental Example 2 (Salt penetration test of concrete composite polymer complex)

Cured concrete specimens were immersed in 2.5% sodium chloride solution for 28 days. Subsequently, the specimens were heat-dissipated, and the chloride-ion penetrating region was sprayed on the cross section of the cross-section which did not fluoresce by spraying 0.1% sodium fluorescein solution and 0.1 N silver acetate solution in accordance with UNI 7928 (Concrete-Determination of the Chloride Ion Penetration). It measured at 10 places and calculated | required the average value.

Type of concrete P / C (%) W / C (%) S / a (%) Unit weight (kg / ㎥) Air volume (%) Slump (cm) cement Polymer Quantity Fine aggregate Coarse aggregate Plain 0 58.2 45.0 350 0 204 756 1014 2.1 9.0 PA-1-Modified 5 51.2 17.5 179 753 957 3.1 10.0 10 44.3 35.0 155 758 963 3.3 10.5 15 40.2 52.5 141 752 955 3.5 10.5 20 36.2 70.0 127 749 952 3.4 10.0 PA-2-Modified 5 49.3 17.5 173 755 960 3.5 9.5 10 45.2 35.0 158 750 953 3.7 10.5 15 41.2 52.5 144 744 945 3.9 10.0 20 37.3 70.0 131 738 937 4.0 10.5 St / ac-modified 5 50.5 17.5 177 747 949 3.8 10.0 10 47.3 35.0 166 735 934 4.2 10.5 15 42.2 52.5 148 735 934 4.3 10.0 20 38.2 70.0 134 729 926 4.5 9.5

Table 2 Formulation Table of Polymer Cement Concrete

Experimental Example 3 (Neutralization Test of Concrete Polymer Composite)

After completion of curing, the specimens were placed in an accelerated neutralization test apparatus (30 ° C., 60% R.H. carbon dioxide concentration of 5%) for 14 days, and then experiments were performed. The specimens were vertically divided into two parts, and a phenolphthalein 1% alcohol solution was sprayed on the cross section, and the portion which did not turn red was measured in the neutralization area, and the average value was determined at ten places.

Experimental Example 4 (acid resistance test of concrete polymer composite)

After curing for 28 days in the sulfuric acid 5% solution, the weight loss rate and the relative compressive strength was measured.

Experimental Example 5 (Compressive Strength of Concrete Polymer Composite)

1 shows the compressive strength of polymer cement concrete. As can be seen from the results, the compressive strength of the polymer cement concrete incorporating the cement concrete admixture increased somewhat as the cement concrete admixture: cement ratio increased, but the cement concrete admixture polymer: cement ratio 10% and 15% Indicates the maximum. Cement concrete containing cement concrete admixture showed higher compressive strength than ordinary cement concrete in all but 5%.

When the cement concrete admixture is dried in cement mortar and concrete matrix, it forms a film and hardens. The elastic modulus of the film is only about 1/10 of the elastic modulus of cement mortar and concrete. It can cause you to drop. However, when the cement concrete is usually used in the field, since the workability is important, the water cement ratio can be remarkably reduced by incorporating the polymer for mixing the cement concrete, and thus the compressive strength can be improved.

Experimental Example 6 (freeze-thawing resistance of concrete polymer composite)

2 is a result of measuring the dynamic modulus of elasticity after freeze-thawing test of polymer cement concrete. In the case of ordinary cement concrete, the relative dynamic modulus dropped below 60% in 90 freeze-thawing cycles, but more than 80% in polymer cement concrete. Above 15% of polymer cement ratio, especially, showed a high relative modulus of elasticity of 95% regardless of the type of polymer used for mixing cement concrete. The polymer film produced when incorporating the cement concrete admixture into the cement concrete strongly binds the matrix, and the expansion pressure due to freezing can be seen as the result of the relaxation of the polymer film for the cement concrete admixture. In addition, due to the waterproofing effect of the polymer film for mixing cement concrete, the amount of moisture penetrating into the concrete is less, which indicates that the freezing of moisture by the East Sea is relatively less.

Experimental Example 7 (flame resistance and neutralization resistance of concrete polymer composite)

Figure 3 shows the chloride ion penetration depth of the polymer cement concrete, Figure 4 shows the neutral depth of the polymer cement concrete. Chloride ion penetration depth of polymer cement concrete is much smaller than that of ordinary cement concrete, and it decreases dramatically with increasing polymer cement ratio. According to the type of polymer for cement concrete mixing, PA-1 was the best, and almost no chloride ion penetrated at 20% of the polymer cement ratio of PA-1. In addition, the neutralization resistance of polymer cement concrete was significantly increased when incorporating polymer for cement concrete mixing, and it was greatly improved by increasing the polymer cement ratio as in the chloride ion penetration test. By incorporating the cement concrete admixture into the cement concrete, it can be seen that the polymer film for cement admixture in the matrix of the cement concrete has greatly improved the water resistance and gas barrier properties.

Experimental Example 8 (acid resistance of concrete polymer composite)

5 and 6 show the weight loss rate and the relative compressive strength before and after immersion of sulfuric acid solution of polymer cement concrete. As can be seen from the results, polymer cement concrete exhibited great resistance to sulfuric acid solution, and improved with increasing polymer cement ratio. In the case of cement concrete, after the sulfuric acid solution was immersed, the surface was dropped a lot, and the aggregate was exposed. However, in the case of polymer cement concrete, there was only a little scale on the surface. The compressive strength after immersion of sulfuric acid solution was found to be 78% or more in polymer cement concrete and almost 95% or more in 20% polymer cement ratio. However, in the case of cement concrete, the compressive strength was reduced to 60%.

In general, the experimental results of polymer cement concrete incorporating polymer to improve the durability of cement concrete are as follows.

1) Incorporating cement concrete admixture into ordinary cement concrete improves the workability and significantly reduces the water cement ratio, thereby improving the fundamental mechanical properties and improving the compressive strength.

2) Incorporation of cement concrete admixture into ordinary cement concrete significantly improves freeze resistance, neutralization resistance, chloride ion penetration resistance, and acid resistance due to the action of polymer film formed in the matrix.

3) If the existing reinforced concrete fume pipe is manufactured based on the excellent durability of polymer cement concrete mixed with cement concrete admixture, the service life can be extended.

In the present invention as described above, when the polymer cement concrete made by mixing the cement material for mixing the concrete concrete is used in the production of the existing reinforced concrete fume pipe, the construction properties are improved, the water cement ratio can be significantly reduced, and the basic mechanical properties can be improved. Its effect is greatly improved, and the resistance to freezing, neutralization, chloride ion penetration, acid resistance, etc. are remarkably improved, and the service life can be extended. Durability and mechanical properties are enhanced to have an advantage that can greatly extend the life.

Claims (2)

In the polymer cement concrete fume pipe composition It is composed of 350kg cement, 17.2 ~ 51.0kg pure acrylic (PA) polymer polymer, 0.3 ~ 0.6kg silicone emulsion system as antifoaming agent, water 141 ~ 179kg, fine aggregate 752 ~ 758kg, coarse aggregate 955 ~ 963kg  Polymer cement concrete fume pipe composition, characterized in that. In the manufacturing method of polymer cement concrete fume pipe 350kg cement, 17.2 ~ 51.0kg pure acrylic (PA) polymer polymer emulsion, 0.3 ~ 0.6kg silicone emulsion system with antifoaming agent, water 141 ~ 179kg, fine aggregate 752 ~ 758kg, coarse aggregate 955 ~ 963kg Is molded into a conventional fume tube mold, and then steam curing (under 80 ° C) is performed in the same way as the conventional cement concrete fume tube curing method, and after curing the fume tube, natural curing (air curing 20 ° C) is 2-3. After performing daily, steam curing (below 80 ℃) for 3 hours or more, or after forming the fume pipe, natural curing (air curing 20 ℃) 28 days for any one selected from the method of curing selected from the method Method of manufacturing polymer cement concrete fume pipe

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