KR100557454B1 - Manufacturing method of high-performance permeable polymer concrete for pavement using recycled aggregates and industrial by-products - Google Patents

Abstract

The present invention is to provide a method for producing high performance permeable polymer concrete for paving and driveway paving, which has superior permeability, strength characteristics, and durability, compared to existing paving permeable concrete structures through recycling of recycled concrete, fly ash, and silica fume. Portland cement or blast furnace slag cement, 5 ~ 8mm, 5 ~ 13mm crushed stone and waste concrete recycled aggregate, acrylic polymer or rubber polymer. Ash is used in the range of 5-30% by weight and 0-30% by weight for the binder, and 0.2 ~ 2.0% by weight of the reinforcing steel fiber or polypropylene fiber for the binder to secure the bending toughness and crack resistance. Or by mixing 0.5 ~ 3.0% by weight of high fluidizing agent to improve fluidity 8 ~ 25%, the water-binder ratio is prepared by a 20 to 30%.

Waste concrete recycled aggregate, permeable pavement for road and driveway, fly ash, silica fume, blast furnace slag cement, reinforcing steel fiber, polypropylene fiber.

Description

Manufacturing Method of High-Performance Permeable Polymer Concrete for Pavement Using Recycled Aggregates and Industrial by-products}

1 is a manufacturing sequence of high-performance water-permeable polymer concrete using waste concrete recycled aggregate and polymer

Figure 2 is a cross-sectional view of the pavement of high performance water-permeable polymer concrete using waste concrete recycled aggregate and polymer

 The present invention uses waste concrete recycled aggregate and crushed stone in the manufacture of conventional permeable concrete, and uses fly ash, silica fume, acrylic polymer and rubber polymer, which are industrial by-products, to improve the strength characteristics and durability of the binder. Reduction of traffic noise and groundwater level due to damage and increase of traffic volume by saving energy by reusing huge amount of waste concrete recycled aggregates and industrial by-products using new material reinforcing steel fiber and polypropylene fiber The present invention relates to the production of high-performance water-permeable polymer concrete having a reducing function of.

To this end, acrylic polymers and rubber polymers are used to derive the optimum porosity and to improve the permeability and strength characteristics and noise reduction performance through the formation of aggregate-adhesive continuous voids. Through the use of waste concrete recycled aggregate and industrial by-product silica fume and fly ash, it is possible to manufacture environmentally friendly high performance permeable polymer concrete that can save and recycle resources.

The present invention is not only prevent the damage caused by the lowering of the groundwater level in the urban area by penetrating rainwater on the road for paving the sidewalks and heavy vehicles, but also because the rainwater does not flow on the road surface, it is convenient for the passage of the vehicle, It is a porous material that not only significantly reduces the noise generated by traffic volume, but also is made of high-permeability polymer concrete that has the same required compressive strength and flexural strength as pavement concrete materials when used in the passage area of roads, roadways and heavy vehicles. do.

In addition, in the present invention, by using waste concrete recycled aggregate generated about 24 million tons per year as construction waste, effective use as a substitute aggregate due to the lack of aggregate and reduction of landfill due to increase of various wastes and reduction of environmental pollution Waste concrete recycled aggregates are used for the purpose, and acrylic polymers, rubber polymers, fly ash, silica fume, and reinforcing steel fibers, which are new materials, are used to satisfy the strength, permeability and durability required for road pavement. The present invention relates to the production of high performance water permeable polymer concrete using polypropylene fibers.

Recently, in the developed countries of the United States, Japan, and Europe, research on resource recycling and recycling in the long term has been accelerated, and in Korea, the recycling rate of waste concrete recycled aggregate and industrial waste, silica fume and fly ash, has been raised to the level of developed countries. We are racing intensively to raise. However, due to the negative viewpoints and various limitations on the recycling of industrial wastes, there is an urgent need to expand the use of concrete through the use of large amounts of construction wastes and industrial by-products.

In general, the conventional method of manufacturing permeable concrete using crushed stone, fine aggregates and other materials shows that the strength characteristics and durability of pavement materials for beams, roadways and heavy vehicles are lower than those of general concrete.

Therefore, high performance permeable polymer concrete using waste concrete recycled aggregate, blast furnace slag aggregate, fly ash, silica fume, polymer (acrylic polymer, rubber polymer) and fiber new material (reinforcing steel fiber, polypropylene fiber) It is manufactured to have the strength and durability required for packaging materials for vehicles. It is a high-performance permeable polymer concrete that can secure durability by recycling resources, reducing traffic noise in urban areas, preserving water resources, and increasing strength and toughness.

The present invention uses waste concrete recycled aggregates for the prevention of environmental pollution in urban areas and the recycling of resources through the effective utilization of waste concrete recycled aggregates generated over 24 million tons per year, and to secure fiber for durability and toughness. In order to improve the strength and durability of reinforcing materials (reinforcing steel fibers, polypropylene fibers) and binders, acrylic polymers and rubber polymers are used, and a manufacturing method of high performance water permeable polymer concrete using silica fume and fly ash, which are industrial byproducts, is used as a mixed material. To provide.

The present invention has excellent permeability and strength characteristics and durability compared to the conventional permeable concrete pavement through the development of permeable concrete for pavement using waste concrete recycled aggregate and industrial by-products, as a permeable concrete pavement for pavement, roadway and heavy vehicles It provides a new method of manufacturing high performance permeable polymer concrete that can prevent the damage caused by flooding by reducing the fall of groundwater level by improving the permeation performance of rainwater during use and reducing the flow of rainwater during rainfall. It is.

The present invention also greatly contributes to the recycling and effective use of resources through the use of recycled concrete recycled aggregates and industrial by-products (silica fume, fly ash), reinforcing steel fibers and polypropylene fibers, such as acrylic and rubber polymers and new fiber materials. To improve the strength, toughness and excellent permeability and durability through the use of a high-performance water-permeable polymer concrete manufacturing method and concrete.

Another object of the present invention is to increase the drainage of rainy weather, as well as to reduce the heat island phenomenon and to reduce traffic noise through the application of permeable concrete pavement that can pass through roads, roadways and heavy vehicles. It is to provide a novel high performance water-permeable polymer concrete manufacturing method and a new water-permeable polymer concrete produced by the production method that will greatly contribute to the improvement and smooth traffic communication.

Materials used to achieve the object of the present invention are as follows.

The cement used in the present invention has a density of 3.12 to 3.16 g / cm ³ , a powder of 3,000 to 3,400 cm ² / g, and the main chemical components are 60 to 65 wt% of CaO, 20 to 23 wt% of SiO ₂ , and 4.0 to Al ₂ O _{3 of} 4.0. 6.0% by weight ordinary portland cement, density 3.12 ~ 3.16g / cm ³ , powder 3,300 ~ 3,700cm ² / g and chemical main components 65 ~ 68% CaO, 20 ~ 23% SiO ₂ , Al ₂ O ₃ 4.0 25 ~ 65% by weight of crude steel portland cement or blast furnace slag powder, which is ～ 5.6% by weight, density 3.0∼3.05g / cm ³ , powder degree 3,600∼4,000cm ² / g, chemical main ingredient is 40 ~ 45% by weight CaO, Blast furnace slag cement with 32 to 47% by weight of SiO _{2 and} 12.0 to 17.0% by weight of Al ₂ O ₃ is used. Aggregate is used for the regeneration of single-grain crushed stone with 5 ~ 8mm and 5 ~ 13mm particle size range and waste concrete of KS standard. Aggregate and blast furnace slag aggregates are used.

The impurity has a density of 2.53-2.76 g / cm ³ , a unit volume mass of 1,330-1,572 kg / m ³ , and the recycled aggregate has a density of 2.21-22.6 g / cm ³ and a unit volume of mass 1,290-1,572 kg / m ³ . Blast furnace slag aggregates are used with a density of 2.5∼3.4g / cm ³ and a unit volume mass of 1,530∼1,850kg / m ³ .

SiO ₂ 92.5∼95.3% by weight of chemical main ingredient with density 2.21 ～ 2.34g / cm ³ and powder 263,000∼272,000kg / m ³ as admixture for effective recycling of industrial by-products and improving strength and durability of permeable paving concrete , Fe ₂ O ₃ 2.51∼2.83% by weight, Al ₂ O ₃ 1.68∼2.31% by weight silica fume, density 2.0∼2.2g / cm ³ , powder degree 3,000 ～ 3500kg / m ³ , chemical main ingredient SiO ₂ 63 ～ Fly ash with 68% by weight and 23 ~ 27% by weight of Al ₂ O ₃ is used. 5 ~ 40mm, density 0.9 ~ 0.95g / cm ³ , tensile strength 260 ~ 710 MPa, more preferably a polypropylene fiber having a density of 0.91 g / cm ³ and a tensile strength of 260 MPa, or a length of 5 to 50 mm, a density of 7.5 to 8.0 g / cm ³ , a tensile strength of 110 to 170 MPa, and more preferably a density of 7.85 g / cm ^3, using the steel fiber reinforcement for the tensile strength of 110MPa, and point to promote the improvement of the durability and strength properties 2.3 ~ 2.6 Pa · s, pH 4.5 ~ 5.0, density of 1.01 ~ 1.15g / cm ^3, the total solid amount of 48-51% by weight of the acrylic polymer or the viscosity of 0.01 ~ 0.15 Pa · s, pH 8.0 ~ 10.0, density of 1.01 ~ 1.15 A rubber-based polymer having a g / cm ³ and a total solid content of 48 to 51 wt% is used.

The present invention is difficult to produce concrete having physical properties to be achieved in the present invention when using a thing other than the above range.

The blend of environmentally friendly high performance permeable polymer concrete with continuous voids used in the present invention uses aggregates mixed with crushed stone and recycled aggregates. The recycled aggregates are 0 ~ 100 of the total used aggregate volume ratio as waste concrete recycled aggregates. % Of water-bonding materials (water / binding materials (cement + polymer (SBR, EVA) + admixtures (silica fume, fly ash))) in order to prevent the performance decrease caused by the use of waste concrete aggregate. %.

In the acrylic and rubber polymers, SBR or EVA is used, and 5 to 20% by weight of the total binder is mixed.

In the above admixture, at least one component selected from silica fume or fly ash is used. In this case, the content of each component is 5 to 30% by weight and 0 to 30% by weight based on the cement used. It is adjusted to mix 5-30% by weight. If it is out of the above range, deterioration of physical properties occurs.

In the above, the binder means only cement when using only cement, and when cement and polymer or admixture are used, it means that the cement, admixture and polymer are combined.

Aggregate used is mixed with crushed stone and waste concrete recycled aggregates, or used alone, and when mixed, used waste concrete recycled aggregates are mixed with crushed stone to 0 to 100% by weight of the aggregate.

Reinforcing steel fibers and polypropylene fibers, which are new reinforcing fibers, are added in an amount of 0.2 to 2.0% by weight based on the weight of the binder. In the case of using a larger amount than the above, it is not good because it lowers the properties of the concrete.

In addition, to improve the fluidity and strength of the cement paste, 0.2 to 3.0% by weight of a high fluidizing agent or a high performance AE water reducing agent is added as a blending agent to form a porosity of 8 to 25% of the high performance permeable polymer concrete for packaging.

For the preparation of the mixture, dry mix the cement, admixture, premixed cement, admixture using Omni-Mixer for uniform dispersion of the materials used, and carry out dry beam for 60 seconds, and mix water and admixture and polymer for 120 seconds. After the fiber is added and mixed for 60 seconds using a split feeding method, the compaction method is to produce a high-permeability polymer concrete using a surface vibration-type compactor. The prepared concrete is subjected to wet curing for 2 days and then wet curing at 23 ± 2 ° C. until a predetermined age.

In the present invention, the content of cement and aggregate can be used by adjusting the design porosity of the entire concrete composition in the range of 8 to 25% and the water-binder ratio of 20 to 30%. If it is out of the above range, the water permeability and mechanical properties are not good because it is outside the scope of the present invention.

The properties of the high performance water permeable polymer concrete produced by the present invention will be described in detail below.

In the present invention, to determine the quality characteristics of high performance permeable polymer concrete using recycled aggregates and industrial by-products (silica fume, fly ash) and new fiber materials (reinforcing steel fibers, polypropylene fibers) and polymers (SBR, EVA) The same experiment was performed. Continuous porosity and permeability coefficient test of continuous void concrete were measured in accordance with the test method of the Eco-Concrete Research Committee of Japan, and the compression test method was used to produce ψ15 × 30cm columnar molds to test the compressive strength of concrete. It carried out according to. In addition, the flexural strength test manufactured a beam specimen of 15 × 15 × 55 cm and used the B Type Autograph of S Company in Japan according to JSCE-SF4's `` Bending Strength and Flexural Toughness Test Method of Fiber Reinforced Concrete ''. Toughness was measured. In addition, to measure the chemical resistance of high-performance water-permeable polymer concrete, the cones of ψ10 × 20cm were immersed in 1% solution of sulfuric acid (H2SO4) to measure mass change rate, and 75 × 75 × 335mm footnote Test specimens were prepared and measured relative dynamic modulus at 6-18 cycles per day at -18 ℃ ~ + 4 ℃ according to ASTM C 666-2 and KS F 2456 [Method for testing the resistance of rapid freezing to concrete]. Figured out.

Table 1 Formulation Example 1 of High Performance Permeable Polymer Concrete Using Recycled Aggregates

Table 2 Mixing Example 2 of High Performance Permeable Polymer Concrete Using Recycled Aggregates

Table 3 below is an evaluation of the quality characteristics of high-performance water-permeable polymer concrete using recycled aggregate for the blending example (Table 1).

[Table 3] Quality Characteristics of High Performance Permeable Polymer Concrete Using Recycled Aggregates

Table 4 below is an evaluation of the quality characteristics of the high-performance water-permeable polymer concrete using the recycled aggregate for Example 2 (Table 2).

[Table 4] Quality Characteristics of High Performance Permeable Polymer Concrete Using Recycled Aggregates

In case of porosity, the mixing rate and aggregate size of waste concrete recycled aggregates and the mixing of fiber new materials (reinforcing steel fibers, polypropylene fibers), polymers (SBR, EVA) and mixed materials (silica fume, fly ash) As the mixing ratio of was increased, the maximum porosity of 1.0% tended to be slightly lower than the design porosity.In the case of aggregate particle size of 5 ~ 8mm and recycled aggregate content of 0, 30, 50, 70 and 100%, respectively 15.1 ~ 14.9%, 15.1 ~ 14.7%, 15.0 ~ 14.6%, 14.9 ~ 14.5%, 14.8 ~ 14.3%, and 14.8 ~ 14.6%, 14.8 ~ 14.4%, 14.7 ~ 14.3%, 14.6 ~ 14.2%, 14.5 ~ 14.0% showed relatively satisfactory design porosity in the mixed design, and the use of crushed stone for the design porosity was higher than that of the waste concrete recycled aggregate. The difference was relatively small and the incorporation of the polymer As the rate increased, the porosity tended to decrease slightly.

As a result of compressive strength test and flexural strength test, when the design porosity is 15% and the aggregate size range of used aggregate is 5 ~ 8mm, the compressive strength according to the mixing rate of recycled aggregate is 20.1 ~ 21.3Mpa, 20.1 ~ 20.9Mpa, 19.9 ~ 21.2Mpa, The flexural strengths ranged from 19.6 to 20.7 Mpa and 19.0 to 20.3 Mpa. The flexural strengths were 5.7 to 6.4 Mpa, 5.7 to 6.3 Mpa, 5.5 to 6.2 Mpa, 5.4 to 6.0 Mpa, and 5.3 to 6.0 Mpa. The compressive strength was 18.3 ~ 19.4Mpa, 18.3 ~ 19.4Mpa, 18.1 ~ 19.3Mpa, 17.8 ~ 18.9Mpa, 17.3 ~ 18.4Mpa according to the mixing ratio of recycled aggregate in the particle size range of 5 ~ 13mm, respectively. 4.6 ～ 5.2Mpa, 4.5 ～ 4.9Mpa, 4.4 ～ 5.1Mpa, 4.4 ～ 4.97Mpa, 4.3 ～ 4.8Mpa. The smaller the particle size of the aggregate used, the greater the compressive strength and flexural strength. The compressive and flexural strengths tended to decrease slightly, but the compressive and flexural strengths tended to increase with increasing polymer content. This effect is because the smaller the particle size of the aggregate used, the more the operating surface between the aggregate and the aggregate, and the strength of the aggregate itself is greater in the case of crushed stone than the recycled aggregate. In addition, the influence on the amount of the polymer blended tended to increase the compressive strength and the flexural strength up to 20% by weight of the polymer compared with the case where no admixture was used.

Considering the results of the permeability coefficient test, the permeability coefficient of permeable concrete pavement is defined as 0.01 cm / sec or more in developed countries such as Japan and Japan. The castle was found to be excellent.

Considering the results of the chemical resistance test, it was found that the use of more than 5% by weight of the polymer according to the mixing ratio of the polymer increased the chemical resistance compared to the case of not using the polymer. In addition, the effect of the mixing ratio of the recycled aggregate was found that the chemical resistance was slightly reduced when the mixing rate of the recycled concrete aggregate is increased. The particle size of aggregate used 5-8mm showed higher chemical resistance than the aggregate of 5 ~ 13mm. This tendency is increased as the admixture of admixture increases, and the adhesion between cement paste and aggregate is improved by the pozzolanic action of admixture with cement, resulting in reduced amount of tricalcium aluminate (C ₃ A) and calcium hydroxide. This is because the expansion pressure due to the formation of etringite due to the reaction decreases.

The results of the freeze-thawing test showed that the aggregates with a particle size range of 5-8mm exhibited less resistance to freeze-thawing compared to the aggregates with a particle size range of 5 ~ 13mm. Influence of the aggregate content of the aggregates showed less resistance to freeze-thaw compared to the case of using the crushed stone, and the freeze-thaw resistance of the polymer when the mixing rate of the polymer was 5% by weight or more was greater than that of the non-mixed material. .

Through the above quality test, high performance permeable polymer concrete using waste concrete recycled aggregate was found to have excellent quality performance, and better permeability and waste concrete regeneration compared to general permeable concrete due to mixing of polymer, new fiber material and admixture. It was confirmed that the aggregate as a permeable packaging material and its availability. In addition, it was confirmed that the use of silica fume, fly ash, and new fiber material showed excellent quality characteristics as a permeable packaging material with an excellent effect of increasing strength and durability.

As described above, the present invention can improve the production technology as well as the conservation of resources through recycling of recycled concrete recycled aggregates generated as construction by-products and industrial by-products such as silica fume and fly ash. The use of EVA and reinforcing steel fibers to secure permeable concrete manufacturing technology of the same strength as the commonly used permeable concrete pavement materials can contribute to the acquisition of foreign currency through the import substitution effect of related products and the export of related technologies overseas.

In addition, the effective use of resources through the use of recycled aggregates and industrial by-products as permeable packaging materials can greatly contribute to the national energy conservation and prevention of environmental destruction through illegal landfills of various wastes.

Claims (4)

(a) Plain cement containing a density of 3.12 to 3.16 / cm ³ , powder of 3,000 to 3,400 cm ² / g and 60 to 65% by weight of CaO, 20 to 23% by weight of SiO ₂ and 4.0 to 6.0% by weight of Al ₂ O _3. ; Crude steel portland cement with a density of 3.12 to 3.16 g / cm ³ and a powder of 3,300 to 3,700 cm ² / g and containing 65 to 68% by weight of CaO, 20 to 23% by weight of SiO ₂ and 4.0 to 5.6% by weight of Al ₂ O _3. ; Or the blast furnace slag fine powder is 25 ~ 65% by weight, density 3.0 ~ 3.05g / cm ³ , powder degree 3,600 ~ 4,000cm ² / g, 40 ~ 45% by weight CaO and 32 ~ 47% by weight Cement selected from blast furnace slag cement containing SiO ₂ and Al ₂ O ₃ in an amount of 12.0 to 17.0 wt%; (b) an impurity having a particle size of 5 to 8 mm or 5 to 13 mm, density 2.53 to 2.76 g / cm ³ , unit volume mass 1,330 to 1,572 kg / m ³ , and density 2.21 to 2.63 g / cm ³ , unit volume mass Aggregate containing 0-100 wt% of KS standard waste concrete recycled aggregate of 1,290 ～ 1,572kg / m ³ in volume ratio of aggregate used; (c) a polymer selected from acrylic or rubber of 5 to 20% by weight based on the content of the cement used to increase the strength and workability of the cement paste; And (d) 0.2 to 3.0% by weight of a high fluidizing agent based on the cement used; Or a high performance AE water reducing agent; The porosity of the design is 8-25% and the water content is 20-30% by weight with respect to the binder composed of the above (a) and (b) to form continuous voids and a water permeability of 0.01 cm / sec or more and 17.3-21.3 Method for producing high performance permeable polymer concrete with excellent compressive strength of Mpa, flexural strength of 4.3 to 6.4 Mpa and excellent durability The method of claim 1, The binder has a density of 2.21∼2.34g / cm ³ , a powder degree of 263,000∼272,000kg / m ³ , SiO ₂ 92.5∼95.3% by weight, Fe ₂ O ₃ 2.51∼2.83% by weight, and Al ₂ to improve the durability. 5-30% by weight of silica fume containing 1.68 to 2.31% by weight of O ₃ or 2.0 to 2.2 g / cm ³ for the total binder, 3,000 to 3,500 cm ² / g of powder, 63 to 68% by weight of SiO ₂ , Al _A method for producing a high performance water permeable polymer concrete, characterized in that it further comprises at least one component selected from 1 to 30% by weight of fly ash containing 23 to 27% by weight of ₂ O ₃ . The method of claim 1, The acrylic polymer has a viscosity of 2.3 to 2.6 Pa.s, a pH of 4.5 to 5.0, a density of 1.0 to 1.15 g / cm ³ , a total solid content of 48 to 51 wt%, and a rubber-based polymer of a viscosity of 0.01 to 0.15 Pa.s, pH 8.0 to 10.0, density 1.01 ~ 1.15g / cm ³ , a method for producing high performance permeable polymer concrete using waste concrete recycled aggregate and crushed stone using a polymer characterized in that the total solid content of 48 ~ 51% by weight. The method according to any one of claims 1 to 3, In the production of the high-permeability polymer concrete, density 0.9 ~ 0.95g / cm ³ , tensile strength 260 ~ 710Mpa, length 5 ~ 40mm polypropylene fiber or density 7.5 ~ 8.0g / cm ³ , tensile strength 110 ~ 170Mpa, length Manufacture of high performance water-permeable polymer concrete using waste concrete recycled aggregate and crushed stone, which give strength, flexural toughness and crack resistance, each containing 5 ~ 50mm of reinforcing steel fiber, 0.2 ~ 2.0% by weight of binder. Way.

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