KR101237710B1 - Filler composition for asphaltic paving - Google Patents

Abstract

PURPOSE: A filling material composition for asphalt pavement is provided to have a black color effect of an asphalt mixture by the function of a large amount of combustible carbon in a TDF(Tire Derived Fuel) cinder. CONSTITUTION: A filling material composition for asphalt pavement comprises 40-200 parts by weight of a blast furnace slag micropowder based on 100.0 parts by weight of a TDF cinder. The TDF cinder is discharged from the infurnace desulfurization furnace of a cogeneration plant. The filing material composition for asphalt pavement comprises 20-100.0 parts by weight of a composite activator based on the 100.0 parts by weight of a TDF cinder. The alkali and the sulphate composite is one or a mixture of two or more by-products generated in desulfurization and dephosphorization process. The by-products contains 50 weight% or more calcium hydroxide(CaOH2).

Description

Asphalt paver composition {FILLER COMPOSITION FOR ASPHALTIC PAVING}

The present invention relates to a pavement material composition for asphalt pavement, and more particularly, unburned carbon and oil contained in a large amount of TDF incinerator are easily fused with the oil of the asphalt mixture, so that the color of the asphalt mixture is excellent, and the color of the asphalt mixture is excellent. The present invention relates to a filler composition for asphalt pavement, which may simultaneously serve as a filler and a hardener.

The KS F 3501 asphalt pavement filler specification specifies that the filler is limestone powder, portland cement, slaked lime, fly ash, recovered dust, furnace steelmaking dust, foundry dust, various incineration ashes and other suitable mineral powders. In general, limestone powder is mainly used as an asphalt pavement material in an industrial site, and a factory for manufacturing a heated asphalt mixture is used to mix collected dust collected with dust collected when heating aggregates with limestone powder.

Portland cement and slaked lime are not used in industrial sites because they are pyrolyzed and additionally processed, and are much more expensive than limestone.

Fly ash is discharged from KEPCO thermal power plant and is mostly used as concrete admixture, but its density is 1.8 ~ 2.2g / cm ^{3 and it} is a light material, and the flow value among the quality characteristics according to KS F 3501 asphalt pavement standard There are many cases that are not suitable for the situation is not widely used.

Other electric furnace steelmaking dusts and casting dusts contain a large amount of heavy metals depending on the characteristics of the process, so there is a risk of heavy metals eluting due to acid rain in urban areas. Therefore, it is not widely used.

The asphalt pavement filler fills the gap between aggregates in the asphalt mixture and acts as a filler-binder in which the filler and the asphalt asphalt are combined. Because of the properties of the filler, the quality of the filler has a great effect on the consistency of the asphalt mixture.

Meanwhile, Korean Patent No. 10-0243926 proposes a method of manufacturing concrete for road pavement using pulverized waste ascon by mixing portland cement 250-500kg / m ³ with crushed waste ascon aggregate, and in Korea Patent Registration 10-0599492 1 to 40 parts by weight of cement, 5 to 15 parts by weight of cement, 5 to 15 parts by weight of cement, and index agent of cement content as a material to supplement the volume shrinkage of cement. 1 to 15 parts by weight, the curing accelerator, characterized in that the addition of 0.01 to 5 parts by weight of cement content in the semi-rigid packaging composition using waste ascon further comprises 0.1 to 40 parts by weight of a filler based on 100 parts by weight of waste ascon. These fillers suggest about 10 kinds of materials such as new aggregate, soil, masato, waste carbon black, waste toner, anhydrous gypsum and semi-hydrated gypsum, but all these techniques are cement and fillers. It is a technique to propose a semi-rigid packaging mixture that does not fall into the category of asphalt mixture packaging characterized by flexible packaging by using a large amount, and it is economical in excess of 3 ~ 6% which is the filling material of the general asphalt packaging mixture. Since the main raw material is cement, it can be said that it has the environmental damage of cement produced by coal as pyrolysis, limestone, clay and iron ore as pyrolysis at high temperature of 1,450 ℃.

In particular, the gypsum used to compensate for cement shrinkage of the Republic of Korea Patent Registration No. 10-0599492 does not exist as a natural mineral in Korea, and relies on the total import. CSA is a kind of manufacturing by increasing the sulfate and alumina components in the cement firing process. It is a special cement that has both fast hardness and expandability, and this is also almost entirely dependent on imports, and even if it is partly produced in Korea, it is not economical because its price per ton is over 700,000 won.

In addition, Republic of Korea Patent No. 10-0958066 in the asphalt concrete composition containing 1.5 ~ 6 parts by weight of cement and fly ash as a filler in the mixture of the new aggregate and waste ascon as a main material and asphalt and emulsifier and waste ascon recycled additive as a raw material In the Republic of Korea Patent Registration 10-0871104 Asphalt concrete containing 8 ~ 10 parts by weight of cement in the pavement mixture as the main raw material and the recycled aggregate of the recycled aggregate with the particle size in the waste ascon with a controlled particle size The composition is presented. In addition, the Republic of Korea Patent Registration 10-0788051 is a waste ascon recycled aggregate as a main raw material to mix 0.01 ~ 0.10 parts by weight of emulsified asphalt with respect to 1 part by weight of waste ascon and mix 0.02 ~ 0.12 parts by weight of cement with respect to 1 part by weight of waste ascon The technique was presented. As such, many techniques using cement as a filler of the existing recycled ascon mixture are all.

As described above, in the case of the hot asphalt mixture, which is a new asphalt pavement mixture, as a filler, limestone powder is mainly used, and the collected dust, which is a dust generated when the aggregate is heated, is collected and used as a dust collector, and recycled asphalt concrete In the case of the mixture, only cement, which simultaneously serves as a filler and a binder, is used alone, or cement is used as a main ingredient by adding fly ash, gypsum, lime, or CSA, and such cement emits a large amount of CO ₂ gas in the manufacturing process. Cement is made from limestone, clay, iron ore and pyrolyzed at high temperature using coal as fuel, that is, it is not environmentally friendly because natural resources and natural damage are serious products. Gypsum, which is used as a subsidiary material, is a mineral that does not exist in Korea, and is an expensive material that depends on imports. Alumina cement and CSA are also very expensive special cements produced by adjusting chemical components such as alumina during the cement firing process. If they are adopted for construction, there are disadvantages that are not economical.

The present invention has been made to solve the above problems, an object of the present invention is to provide an asphalt pavement material composition using only industrial by-products.

Another object of the present invention is to provide an asphalt pavement material composition having excellent color development effect, in which unburned carbon and oil contained in a large amount of TDF incinerator are easily fused with an oil mixture of an asphalt mixture.

Still another object of the present invention is to provide an asphalt pavement material composition which can shorten the curing time of ascone by using a quick water absorption function of the TDF incinerator.

Still another object of the present invention is to provide an asphalt pavement filler composition capable of simultaneously serving as a filler and a curing agent of ascone.

In order to solve the above technical problems, the asphalt pavement material composition according to the present invention includes blast furnace slag fine powder 40 to 200 parts by weight based on 100 parts by weight of TDF (Tire Derived Feul) incinerator.

In addition, the TDF incinerator is preferably discharged from the furnace desulfurization incinerator that mixes coal, waste tires and limestone.

In addition, it is preferable to further include 20 to 100 parts by weight of alkali and sulfate complex stimulants based on 100 parts by weight of the TDF (Tire Derived Feul) incinerator.

In addition, the alkali and sulfate complex stimulant is preferably any one or a mixture of two or more of the group consisting of coke desulfurized gypsum, flue gas desulfurized gypsum, by-products generated in the desulfurization and dephosphorization process of steel mills.

In addition, the by-product generated in the desulfurization and dephosphorization process of the steel mill is preferably calcium hydroxide (CaOH ₂ ) content of 50% by weight or more.

According to the present invention, since it uses only industrial by-products without using cement at all, it is very environmentally friendly and economical.

In particular, the unburned carbon and oil contained in a large amount in the TDF incineration is easily fused with the oil of the asphalt mixture, it has an excellent color development effect that makes the color of the asphalt mixture more black.

It also has the effect of simultaneously acting as a curing agent as well as the filling material of ascone.

Hereinafter, the components of the asphalt pavement material composition according to the present invention will be described in detail.

Asphalt pavement material composition according to the present invention is used as a filler and binder of various ascones when constructing road paving using new heated ascon, new normal room ascon, heated regenerated ascon, and room temperature regenerated ascon to provide an excellent asphalt pavement mixture. .

Asphalt pavement material composition according to the present invention includes a TDF (Tire Derived Feul) incineration material, blast furnace slag fine powder, alkali and sulfate complex stimulant.

The TDF incinerator is produced in an in-furnace desulfurization (fluidized bed) incinerator in which coal, waste tire, and limestone are mixed and burned.

In the case of large-scale PC boilers of general coal-fired power plants, the incineration ash generated by operating a separate desulfurization facility due to the sulfur content of coal used as fuel is SiO _2, but the main component is SiO _2. Incinerator ash from TDF (Tire Derived Feul) incinerator is an incineration residue mainly generated from small and medium-sized cogeneration plants. Carbon is not an incomplete combustion product of waste tire because it does not have separate desulfurization equipment and mixes waste tire, coal and limestone. A large amount of components are included in the incineration ash, and the sulfur dioxide gas formed by combining the sulfur component of coal and oxygen in the air is subjected to an in-furnace desulfurization process that reacts with decarbonated CaO of limestone. Has characteristics.

As such, the calcium oxide contained in the TDF incinerator utilizing a furnace desulfurization method is absorbed, exothermic, and expanded with water to form calcium hydroxide. The reaction formula is as follows.

CaO + H ₂ O-> Ca (OH) ₂ + 15.6 kcal mol ^-1

Incinerators such as coal-fired fly ash, which are usually produced in large-scale thermal power plant PC boilers, are recycled as concrete admixtures because SiO ₂ is the main component and the vitrification rate has high pozzolanic reactivity. However, incineration residues containing a large amount of calcium oxide generated in the furnace desulfurization incinerator are incapable of being used as concrete admixtures due to their absorption, heat generation, and expansion characteristics. Moreover, in case of TDF incinerator, carbon and oil, which are incomplete combustion products of tires used as fuel, are present in a large amount, and when used in cement concrete due to low specific gravity, carbon and oil may float on the concrete surface, making it impossible to use as a mixed material of concrete.

However, the chemical reaction of absorption heating and expansion by calcium oxide component of TDF incinerator compensates for the shrinkage, which is a disadvantage of cement, and has an effect of stabilizing the ground quickly by absorbing moisture in the asphalt mixture early. In addition, unburned carbon contained in a large amount of TDF incinerator is easily fused with the oil content of the asphalt mixture, and has a color development effect that makes the color of the asphalt mixture black.

Therefore, the present invention is to use the TDF incinerator which can not be utilized at all as a cement concrete admixture.

In addition, the blast furnace slag fine powder has excellent strength when tested in comparison with converter slag fine powder, steelmaking slag fine powder, stainless steel slag fine powder and copper smelting fine powder produced through a similar process.

The blast furnace slag fine powder is called latent hydraulic material because the oxide film is formed when CaO comes into contact with the main component or water and does not hydrate itself. In order to exhibit latent hydrophobicity, the oxide film must be destroyed, and there are two methods of stimulating it: sulfate stimulation and alkali stimulation by strong alkali.

Such alkali and sulphate complex stimulus materials include petroleum coke desulfurized gypsum, flue gas desulfurized gypsum, and by-products generated during desulfurization and dephosphorization in steelworks. The by-products generated in the desulfurization and dephosphorization processes of steel mills are preferably in the form of powder and have a calcium hydroxide (CaOH ₂ ) content of 50% by weight or more.

CaO of these substances reacts with water to transfer to calcium hydroxide, which stimulates fine powder of blast furnace slag to play a role as filler and binder.

In addition, the petroleum coke desulfurized gypsum is a material that generates a large amount of ettringite in the early stage of the reaction, so it is generated as a waste in an incinerator, so it is more economical than an anhydrous gypsum that exhibits the same performance or a phosphate gypsum which has to undergo a dehydration process by firing. Do.

In addition, the by-products generated during the desulfurization and dephosphorization of the steel mill are particulates, and the main component is composed of CaO.

The strength of the blast furnace slag powder and the sulphate irritant chemical reaction at the initial aging stage is manifested by the C-S-H gel produced simultaneously with a large amount of ettringite skeleton. In addition, CSH gel wraps Ettlingite, and as the age goes by, the amount of production is continuously increased, and CSH gel is filled tightly with the voids of the cured paste. Do it.

As such, the asphalt fill material composition using the TDF incinerator of the present invention is usually a portland cement is not used at all, and the TDF incinerator and blast furnace slag fine powder containing a large amount of free CaO and unburned carbon are used as raw materials. Unlike cement, blast furnace slag powder and TDF incinerators are not hydrated on their own, unlike cement, but have hardening properties that induce hydration reactions by the addition of stimulants such as hydroxides or sulfates. It is cut off while the formula ^{2 +} ions, such as a Ca, Mg ^{+ 2,} Al ^{+ 3} included in the internal network structure are eluted will be jinige the cured properties, such as cement. Looking at the composition of the filler according to the present invention, SiO ₂ , Al ₂ O ₃ , CaO occupies most of the 80% or more of the whole, and is composed of the remaining components such as Fe ₂ O ₃ , MgO.

These components react with water in the mixture to produce new hydrates and pozzolanic materials, such as calcium silicate hydrate (CSH) and calcium aluminate hydrate (CAH), in the long term, resulting in their strength. Almost 50% of CaO also produces portlandite (Ca (OH) ₂ ) with digestion of pore water and determines the initial strength due to the vitreous effect. Ca2 + ions released from the portlandite are added to the mixture. Reaction with silicate (SiO ₂ ) or aluminate (Al ₂ O ₃ ) included also produces calcium silicate hydrate (CSH) and calcium aluminate hydrate (CAH). This reaction results in essentially the same hydration mechanism as cement without the use of cement.

On the other hand, 40 to 200 parts by weight of blast furnace slag fine powder is mixed with 100 parts by weight of TDF (Tire Derived Feul) incinerator. When the blast furnace slag powder is mixed with less than 40, it is difficult to express the strength, and when mixed in excess of 200 parts by weight, the amount of incorporation of the TDF incinerator is relatively reduced, which reduces the black color development effect and is disadvantageous in terms of economics.

In addition, 20 to 100 parts by weight of an alkali and sulfate complex stimulant are mixed with 100 parts by weight of a TDF (Tire Derived Feul) incinerator. When the alkali and sulfate complex stimulants are mixed at less than 20 parts by weight, it is difficult to stimulate the blast furnace slag powder, and it is difficult to express the strength. When the mixture is mixed at more than 100 parts by weight, a surplus stimulant that does not react with the blast furnace slag powder is present. As the strength decreases and the amount of TDF incinerators decreases relatively, the color development effect of black is reduced, which is disadvantageous in terms of economy.

Hereinafter, preferred embodiments and comparative examples of the present invention will be described. The following examples are intended to illustrate the invention and should not be construed as limiting the scope of the invention.

Example

First, as a filler according to the present invention, 150 parts by weight of fine blast furnace slag fine powder, alkali and sulfate complexes with respect to 100 parts by weight of TDF (Tire Derived Feul) incinerator discharged from an in-furnace desulfurization incinerator in which coal, waste tire and limestone are mixed and combusted. A filler was prepared by uniformly mixing 30 parts by weight of petroleum coke desulfurized gypsum and 30 parts by weight of by-products generated during the desulfurization and dephosphorization of steel mills.

Next, to evaluate the quality characteristics of the filler according to KS F 3501: 2008, the moisture, particle size, plasticity index, flow value, immersion expansion, and peel resistance of the filler were tested.

Comparative example

One type of ordinary portland cement in the market was purchased as a comparative sample, and the moisture, particle size, and specific gravity of the prepared fillers were tested to evaluate the quality characteristics of the fillers according to KS F 3501: 2008.

Filling  Performance test method and result

As shown in Table 1 below, the moisture and particle size tests were KS F 3501, the plasticity test was KS F 2303, the flow test was KS L 5111 and KS F 3501, the immersion expansion was KS F 2337 and KS F 3501, and the peel resistance was KS. F 3501 and specific gravity were carried out by the method specified in KS L 5110.

Test Items Test Methods Remarks moisture KS F 3501 Asphalt paver Granularity KS F 3501 Asphalt paver Plasticity index KS F 2303 Soil Limit and Fire Limit Test Method of Soil Flow test KS L 5111 Cement Test Flow Table Immersion Expansion KS F 2337 Test method for resistance to plastic flow of asphalt mixture using Marshall tester Peel Resistance KS F 3501 Asphalt paver importance KS L 5110 Specific gravity test method of cement

(1) water content

In order to measure the water content of the filling material, about 100 grams of the sample was weighed with an accuracy of 0.1 grams, spread to an even thickness, placed in a constant temperature dryer, dried at a temperature of 105 ° C ± 5 ° C until constant, and then room temperature in a desiccator. After cooling to form a weight to calculate the moisture content is shown in Table 2. As can be seen from Table 2, both the Examples and Comparative Examples satisfied the KS standard limit of 1.0% or less.

division moisture(%) Plasticity index Flow test Immersion Expansion Peel Resistance importance KS standard 1.0 or less 6 or less 50% less than 3% or less 1/4 or less - Example 0.3 5.3 48.9% 2.4% 1/6 or less 2.86 Comparative example 0.7 - - - - 3.14

(2) particle size

The sample is placed in a constant temperature dryer and dried at a temperature of 105 ° C. ± 5 ° C. until it reaches a constant weight. The sample is cooled to room temperature in a desiccator, weighed about 50 grams with a precision of 0.1 grams, and tested according to the method of KS F 3501. The results are shown in Table 3. As can be seen from this, the particle size of the filler and the cement of the present invention was found to satisfy the KS standard, respectively.

division 600 ㎛ 300㎛ 150 탆 75 μm KS Standard
Body mass and mass percentage (%) 100 95 or higher over 90 70 or more Example
Body mass and mass percentage (%) 100 96.5 92.1 79.3 Comparative Example
Body mass and mass percentage (%) 100 95.3 91.6 75.2

(3) Plasticity index, flow test, immersion expansion, peeling resistance, specific gravity

In the case of using materials other than cement limestone powder and slaked lime as a filler according to KS F 3501 3.4, it is required to test plasticity index, flow test, immersion expansion and peeling resistance in addition to moisture content and particle size. Since it is an important factor in the design, the test was performed and the results are shown in Table 2. As shown in Table 2, the filler of the present invention appears to satisfy all the matters set forth in the KS F 3501 standard, which is the filler material for asphalt pavement, so that a sufficient object can be achieved when a filler material having such characteristics is constructed in asphalt pavement. It is expected that the economic and environmental ripple effect on the industrial site will be considerable because it can replace all the filling materials of the room temperature recycled ascon, which uses only portland cement as the filling material.

Claims (5)

It comprises 40 to 200 parts by weight of blast furnace slag fine powder with respect to 100 parts by weight of TDF (Tire Derived Feul) incinerator,
The TDF incinerator is asphalt pavement incinerator, characterized in that discharged from the in-house desulfurization incinerator of a combined heat and power plant to mix coal, waste tire and limestone.

delete The method of claim 1,
An asphalt pavement material composition, further comprising 20 to 100 parts by weight of an alkali and sulfate complex stimulant based on 100 parts by weight of the TDF (Tire Derived Feul) incinerator.
The method of claim 3,
The alkali and sulfate complex stimulants are coke desulfurization gypsum, flue gas desulfurization gypsum, any one or a mixture of two or more of the group consisting of by-products generated in the desulfurization and dephosphorization process of the steel mill, the by-products generated in the desulfurization and dephosphorization process of the steel mill Asphalt paver composition, characterized in that the calcium hydroxide (CaOH ₂ ) content is 50% by weight or more.
delete