KR20010086573A - Method of Making and facing with Recycled Asphalt Concrete based on Oil-based Complex Solvents - Google Patents

Abstract

PURPOSE: Provided are a process for producing regenerated asphalt concrete by using oil-based composite solvent and a paving method thereof, the waste asphalt concrete can be reused as a paving material. CONSTITUTION: The process for producing the regenerated asphalt concrete comprises the steps of: preparing the oil-based composite solvent emulsion by mixing petroleum, an organic solvent, a polymer synthetic resin, and asphalt; mixing the oil-based composite solvent emulsion, aggregate fine powder such as lime stone powder and cement, and the waste asphalt concrete. The paving method comprises the steps of: spreading the regenerated asphalt concrete on a road; making the spread asphalt concrete hard; heating the asphalt concrete at a temperature of 50-120deg.C; recovering the solvent.

Description

Method for making recycled ascon using lipophilic composite solvent and packaging method thereofMethod of Making and facing with Recycled Asphalt Concrete based on Oil-based Complex Solvents

Asphalt pavement increases with the number of years of pavement like humans, asphalt in the pavement gradually combines with oxygen in the air, undergoing aging process, and the chemical composition gradually changes. As a result, the packaging material becomes stiff and eventually leads to excessive cracking and end of life. This obsolete pavement is partially cut and overlaid, or all layers are rolled up and repacked, resulting in waste ascon. Another cause of severe plastic deformation in the road pavement, which requires partial repairs, cuts away part of the pavement, which also generates waste ascon. These waste ascons are recycled for the purpose of resource recycling and pollution prevention. That is, a heat-mixed recycling method and a room temperature mixed recycling method.

Heat-mixed recycling methods include drum dryer method and high temperature heating aggregate method. The drum dryer method mainly adopts a continuous type, and the basic principle is to indirect heating method by heat conduction in order to prevent oxidation aging due to direct heating. The new aggregate is preheated with a burner and sent to a drum mixer, and the new aggregate heated in the drum, crushed waste concrete, and new asphalt are added and mixed at appropriate ratios to produce recycled ascon. In addition, there is a method of making a high-temperature exhaust gas by indirect heating method to be introduced into the drum and heating it, and by controlling the temperature distribution in the drum to generate an air circulation action, using the convection heat generated at this time. On the other hand, the high temperature heating aggregate method is to put waste ascon and new asphalt into the batch plant tower at room temperature and at the same time inject additional new aggregates preheated in a high temperature drying furnace at a high temperature state to mix the materials introduced into the conductive heat of the heating aggregate. It is a batch method for producing recycled ascone. Like this, the heat mixing recycling method (drum dryer method and high temperature heating aggregate method) literally melts and mixes asphalt using high temperature heat. In this method, as mentioned earlier, new asphalt (or asphalt emulsion) is added to the waste ascon to regenerate oxidized aged asphalt, and additional fresh aggregate is added in an appropriate amount to prevent the strength degradation caused by the added asphalt. Add. Occasionally, modified asphalt is added to the new asphalt by adding appropriate amounts of rejuvenators (mostly aromatic compounds) or polymers (SBS, SBR, LDPE, EVA, HDPE, etc.).

The normal-temperature mixed recycling method refers to a method of producing recycled ascon by mixing together waste ascone, new aggregate, and asphalt emulsion ground at room temperature. The produced recycled ascon is paved on the base or surface of the road, and after several days of drying, the solvent contained in the emulsion evaporates to have a physical strength, thereby performing the road paving function. Asphalt emulsion is used to dissolve or disperse asphalt in liquid (water or volatile oil or organic solvent), and this emulsion is the material that is the core of the mixed-temperature recycling method. That is, there are lipophilic cut-back asphalt emulsions made by dissolving asphalt in petroleum solvents (kerosene, diesel oil, gasoline) and hydrophilic asphalt emulsions in which asphalt is dispersed using water and a surfactant. Emulsions are sometimes added with styrene-butadiene latex to improve strength and elasticity. Hydrophilic asphalt emulsions are also divided into cationic, anionic, and nonionic asphalt emulsions depending on the chemical properties (cationic, anionic, nonionic) of the surfactant used. Asphalt emulsions necessarily contain asphalt as a main component. These emulsions are divided into rapid, medium and slow setting curing emulsions, depending on the rate at which water or organic solvents are dried. It should be noted that the currently produced lipophilic cut-back asphalt emulsion or hydrophilic asphalt emulsion does not contain any polymer synthetic resin other than styrene-butadiene latex, unlike the heat-mix recycling method.

The heat mixed recycling method is a relatively expensive process because it requires a heating device and heating costs, the room temperature mixed recycling method involves the cost and process of making asphalt emulsion. In addition, the hydrophilic asphalt emulsion has a drawback of weakening the pavement strength in the presence of moisture, and the lipophilic cutback asphalt emulsion is rarely used for asphalt pavement due to the lack of sufficient physical strength. Do not.

In order to compensate for this disadvantage, in the present invention, as a kind of room temperature mixed recycling method, without the introduction of additional new asphalt (or asphalt emulsion) or aggregate, to develop a lipophilic solvent emulsion containing a polymer synthetic resin, the filler (stone powder) , Cement, fly ash, slag fines, various fillers, etc.) and waste ascon crushed particles were added and mixed at room temperature.

An object of the present invention is to provide a method for producing ascon using a lipophilic composite solvent containing a polymer synthetic resin, a filler and a waste ascon crushed particles mixed at room temperature to produce a recycled ascon.

Another object of the present invention is to provide a method for producing ascon using a lipophilic composite solvent to produce a new ascon by mixing the new asphalt and aggregate in the above-described solvent.

It is still another object of the present invention to provide a method for room temperature packaging of ascones using a lipophilic solvent emulsion to pave the above-mentioned recycled ascon or novel ascon on the road.

An object of the present invention described above is to prepare a lipophilic composite solvent emulsion by dissolving some or all of petroleum oil, an organic solvent, a polymer synthetic resin, asphalt mixed and dissolved, aggregate fine particles such as stone powder, cement and the like in the solvent oil at room temperature It is achieved by the method for producing ascon using a lipophilic composite solvent comprising the step of mixing the waste ascon.

Another object of the present invention is achieved by the method for producing ascon further comprising the step of preparing a new ascon by mixing an appropriate amount of the new aggregate in the emulsion at room temperature.

Still another object of the present invention is the step of laying the asphalt ascone prepared in accordance with claim 1 or 2 on the road using a compaction equipment, the step of compacting ascone laid on the road using a compaction equipment, and shortening the curing time In order to achieve this, the method is accomplished by the ascon packaging method using a lipophilic solvent emulsion, comprising the step of heating the package compacted with a solvent recovery device to 50-120 ^° C, and recovering the solvent to prevent pollution due to volatile solvents. do.

According to the present invention, the asphalt on the recycled ascon particles, which are absorbed and absorbed by the solvent during the mixing process, is compressed by compaction pressure during the packing process so that the interface between the particles disappears and the material becomes one material together with the solvent evaporation. do. Therefore, unlike the conventional mixed-temperature recycling method, this technique does not require new asphalt material, so it is the simplest recycling method that does not require the process of dissolving asphalt in a solvent to make asphalt emulsion in advance. For this reason, ascon recycled in this way can achieve significant cost savings compared to other recycling methods.In addition, unlike hydrophilic asphalt emulsions, they are not affected by moisture and therefore do not change their physical strength even in water. none. However, by relying solely on the asphalt present on the waste ascon, the aggregate surface exposed during the cutting of the waste pavement is exposed to the solvent, but the asphalt is deficient, resulting in relatively poor bonding strength and poor physical strength after compaction. Can be. In order to compensate for this, a polymer synthetic resin was added to the solvent, and aggregate aggregates were also considered to fill the space between the large aggregates. In the present invention, for the first time in the lipophilic room temperature recycling method, by using a synthetic resin of rubber system (SBS, SBR, Crumb Rubber, etc.) to improve the elasticity and viscosity of the recycled ascon, excellent in fatigue cracking, various cracks, plastic deformation, etc. Solvent was developed. This technology belongs to the room temperature regeneration technology, compared with the heating regeneration technology, the heating process is omitted, it is possible to reduce the heating equipment or heating costs. However, it should be noted that there is a problem of pollution caused by volatile solvents, and therefore solvent recovery equipment is required when packaging. Development of a solvent having the above characteristics forms the core of the present invention.

Hereinafter, a method for producing recycled ascone using the lipophilic composite solvent according to the present invention will be described in detail.

In the present invention described above, the development of the composite organic solvent forms the core thereof, and the type of the developed composite organic solvent and the composition of the recycled ascon and the new ascon can be divided into various types as follows.

First, it is a technology to make recycled ascone by mixing one or two or more organic solvents (oil-based solvent) directly added to the waste ascone. Organic solvents include kerosene, diesel, gasoline, hexane, heptane, petrolene, acetone, methyl ethyl ketone, acetate ester, ethyl ether, alcohol (methyl, ethyl, propyl), thinner, terpene (turpentine). oil, pine oil, soybean oil, tetraline, decaline, linseed oil, copper oil, ethylene trichloride, ethane trichloride, petroleum naphtha, coal naphtha, etc. This technique uses 90 to 99.5% by weight of waste ascon crushed particles, 0.5 to 10% by weight of one or more organic solvents, and 0 to 10% by weight of fillers (stone, cement, fly ash, slag fines, aggregate fillers, etc.). Mix at room temperature to make recycled ascone.

Composition 1

1.5 wt% petrol

0.3 wt% toluene

0.2 wt% xylene

0.5 wt% copper oil

0.5 wt% powder or cement

97% by weight waste ascon crushed particles

Composition 2

1.8 wt% thinner

0.9 wt% hexane

0.8 wt% linseed oil

1.5 wt% stone powder or cement

96% by weight waste ascon crushed particles

Second, polymer synthetic resin (vinyl acetate-based emulsion, styrene-butadiene-based emulsion, acrylic emulsion, alkyd resin, aminoalkyd resin (melamine resin) containing rubber type in 80-97 wt% of one or more mixed solvents of organic solvents mentioned above , Urea resin, etc.), benzoguanamine resin, alkylphenol resin, acrylic resin, polyurethane resin, unsaturated polyester resin, fluororesin, epoxy resin, Cashew resin, polyvinyl chloride resin, polyvinyl acetate resin, vinyl butyral Resin, polyacrylic ester resin, silicon resin, nitrocellulose, acetylcellulose, LLDPE, LDPE, HDPE, EVA, SBS, SBR, isoprene rubber powder, butadiene rubber powder, crumb rubber, natural rubber powder, plasticizer (phthalic acid A solvent emulsion is prepared by dissolving dibutyl, dioctyl phthalate, diethyl phthalate, etc.) 3-20% by weight. At this time, the solvent to be used should be able to dissolve both asphalt and synthetic resin, and to be easily volatilized at room temperature. The polymer resin should be appropriately selected according to the solvent and the use. Especially, when elasticity is more important than viscosity, rubber-based polymer is more preferable. 0-10 wt% of the filler (stone powder, cement, fly ash, slag fines, aggregate filler, etc.) is added to 0.5-10 wt% of the solvent emulsion thus prepared, and 90-99.5 wt% of the cut or crushed waste ascone is added thereto. After mixing well at room temperature with a mixer to prepare a recycled ascon for surface and substrate.

Composition 1

2 weight% thinner

0.4 wt% Terepin oil

0.1 wt% dibutyl phthalate

1.3 wt% Alkyd Resin

0.7 wt% petroleum oil

95.5% by weight of waste ascon crushed particles

Composition 2

1.9 wt% thinner

0.9 wt% Terepin oil

1.0 wt% Styrene Butadiene Emulsion

1.2 wt% stone powder or cement

95% by weight waste ascon crushed particles

Third, aromatic compounds (toluene, xylene, phenol, benzoic acid, tetralin, naphthalene, aniline, benzyl, benzophenone, divinyl benzene, di-octyl phthalate, phthalic acid, phthalic acid) an anhydride, a styrene monomer, a quinone, etc.) or a commercial rejuvenator (mostly aromatic) 3-20 wt% is added to prepare a complex solvent emulsion. The purpose of adding an aromatic compound to a solvent or a solvent emulsion is to recycle asphalt in waste ascone. Asphalt reacts with oxygen in the air with increasing service life, resulting in oxidative aging, resulting in a loss of elasticity and stiffness. This happens because the aromatic compounds are oxidized and turn into other hard materials, which are relatively scarce. The main reason for adding aromatic compounds is to compensate for this relative deficiency to give the asphalt elasticity and to regenerate the asphalt as close to its original state. 0-10% by weight of the filler (stone powder, cement, fly ash, slag fines, aggregate filler, etc.) was added to 0.5-10% by weight of the composite solvent oil thus prepared, and 90-99.5% by weight of the cut or crushed waste ascone was added. After mixing well at room temperature with a mixer to prepare a recycled ascon for surface and substrate.

Composition 1

0.8 weight% thinner

0.4 wt% Terepin oil

0.3 wt% xylene

0.2 wt% dioctyl phthalate

0.3 wt% alkylphenol resin

98% by weight waste ascon crushed particles

Composition 2

0.8 wt% thinner

0.3 wt% Terepin oil

0.2 wt% xylene

0.2 wt% dibutyl phthalate

0.2 wt% benzoguanamine resin

0.3 wt% stone powder or cement

98% by weight waste ascon crushed particles

Fourth, a new asphalt binder (AP-1, -3, -5) 3-20 wt% is dissolved in a first solvent, a second solvent emulsion, or a third complex solvent oil to prepare a solvent emulsion asphalt. The main purpose is to add flexibility to the waste asphalt by adding fresh asphalt and to provide extra asphalt to coat the exposed aggregate surface area due to the crushed aggregate. This oil is different from the conventional cut-back asphalt oil, in addition to petroleum compounds (light oil, kerosene, gasoline, etc.) in the solvent, other organic solvents and various synthetic resins mentioned above are added to improve the pavement strength and service life. There is a point. 0.5-10% by weight of the solvent emulsion asphalt so prepared was added 0-10% by weight of fillers (stone powder, cement, fly ash, slag fines, aggregate filler, etc.) and 90-99.5% by weight of cut or ground waste ascon. After mixing well at room temperature with a mixer to prepare a recycled ascon for surface and substrate.

Composition 1

0.8 wt% gasoline

0.3 wt% toluene

0.4 wt% Asphalt Binder (AP-3)

0.2 wt% xylene

0.3 wt% stone powder

98% by weight waste ascon crushed particles

Composition 2

0.8 wt% thinner

0.3 wt% Terepin oil

0.4 wt% Asphalt Binder (AP-3)

0.2 wt% Nitrocellulose

0.3 wt% stone powder or cement

98% by weight waste ascon crushed particles

Fifth, 20-60% by weight of the solvent mentioned in the first, 3-20% by weight of the synthetic resin, and 40-80% by weight of the new asphalt are mixed and dissolved to form a lipophilic asphalt emulsion. It is a technique for producing new ascon for surface and base layers by adding and mixing 80 to 97% by weight of new aggregates including fillers to 3 to 20% by weight of the oil. Ascon is manufactured as compared with the conventional cutback lipophilic asphalt emulsion, as in the fourth case, in addition to the general petroleum solvent, a specific solvent and synthetic resin can be added to improve the pavement strength.

Composition 1

1.0 wt% gasoline

0.5 wt% toluene

0.5 wt% Nomal Hexane

0.5 wt% Terepin oil

2.0 wt% asphalt binder (AP-3)

0.5 wt% alkylphenol resin

95% by weight new aggregate (19mm-fine powder (# 200 mesh or less))

Composition 2

1.8 wt% thinner

1.0 wt% gasoline

0.6 wt% Terepin oil

1.5 wt% asphalt binder (AP-3)

0.5 wt% unsaturated polyester + curing agent

94.6% by weight new aggregate (19mm-fine powder (below # 200 mesh))

It is most important to compress the regenerated ascon and the new ascon made in the above with a vibrating roller to make perfect compaction. This is because the asphalt on the waste ascon particles wetted by the solvent adheres to each other by the compaction pressure during the compaction process, so that the separation of the particles becomes a single substance. When the volatile liquid is evaporated after compaction and the curing of the package is completed, pollution may be generated due to the volatilized solvent, so that a solvent recovery device may be required to solve the problem. The packaging curing time is related to the shortening of the packaging period, and since the curing time is different according to the evaporation rate of the solvent used, selection of an appropriate solvent is very important in the present invention.

Example 1

1% by weight of gasoline, 0.3% by weight of toluene, 0.2% by weight of xylene, 0.5% by weight of kerosene, 1% by weight of stone powder, 97% by weight of cutting or pulverized waste ascone was mixed with a mixer at room temperature to prepare recycled ascone. About 1300 grams of recycled ascon was filled into the Marshall Mold, and Marshall specimens were prepared by performing both upper and lower side compaction 50 times on one side. After 3 days of curing time, the Marshall test was performed by impregnating water at 60 ° C. for 30 minutes. The Marshall stability value of 850 was found and far exceeded the base material specification of 400, proving that it can be fully utilized as a base material.

Example 2

Thinner 1.5 wt%, terepene oil 0.3 wt%, xylene 0.2 wt%, dioctyl phthalate 0.5 wt%, urea resin 0.5 wt% are mixed at room temperature or 60-80 ^° C to make a homogeneous liquid. 3% by weight of this liquid, 1% by weight of stone powder, 96% by weight of cutting or crushed waste ascone were mixed with a mixer at room temperature to prepare recycled ascone. About 1300 grams of recycled ascon was filled into the Marshall Mold, and Marshall specimens were prepared by performing both upper and lower side compaction 50 times on one side. After 3 days of curing time, the Marshall test was performed by impregnating water at 60 ^° C. for 30 minutes. The Marshall stability value was 1550 and far exceeded the surface material specification of 800, proving that it can be sufficiently used as a base material as well as a surface material.

Example 3

Thinner 1.0% by weight, 0.5% by weight of n-hexane, 0.4% by weight of toluene, 0.6% by weight of terepine oil, 0.5% by weight of styrene-butadiene-styrene resin, 1.5% by weight of new asphalt AP-3 at a temperature of 60-100 ^° C To make a uniform liquid. 4.5 wt% of this liquid, 1 wt% of stone powder, and 94.5 wt% of cut or crushed waste ascon were mixed with a mixer at room temperature to prepare recycled ascon. About 1300 grams of recycled ascon was filled into the Marshall Mold, and Marshall specimens were prepared by performing both upper and lower side compaction 50 times on one side. After 3 days of curing time, the Marshall test was performed by impregnating water at 60 ^° C. for 30 minutes. The Marshall stability value was 1650 and far exceeded the surface material specification of 800, proving that it can be sufficiently used as a base material as well as a surface material.

Example 4

1.0% by weight of gasoline, 0.5% by weight of n-hexane, 0.5% by weight of toluene, 0.5% by weight of terepin oil, 0.5% by weight of unsaturated polyester resin, 2.0% by weight of new asphalt Asphalt AP-3 at a temperature of 60-100 ^o C Make a liquid. 5.0% by weight of this liquid, 1-3 drops of hardener, and 95% by weight of new aggregates (19 mm-fine powder (below # 200 mesh)) were mixed with a mixer at room temperature to prepare a new ascon. Marshall specimens were prepared by filling the top and bottom double-sided compactions 50 times on one side, and after three days of hardening, the Marshall test was performed by immersion in water at 60 ^o C for 30 minutes. 1450 came out and far exceeded the surface material specification value of 800, proving that it can be sufficiently used as a base material as well as a surface material.

As mentioned above, the present invention has described a method for producing a composite solvent emulsion without an asphalt binder (in some cases, a technique in which asphalt is added) is included. Since these solvent emulsions can be produced at room temperature, they do not require complicated process equipment or costs, and can be manufactured by simple mixing, thereby reducing costs and simplifying the process. In addition, since the solvent oil, stone powder (or cement) and waste ascon are mixed in an appropriate amount at room temperature, regenerated ascon is directly produced and laid down, thereby reducing the overall cost by eliminating the heating cost as well as the heating cost compared to the heat mixed recycling method. Whether or not the solvent contained a new asphalt by adding the polymer proposed in the present invention was able to improve the strength of the pavement, the degree of improvement was determined by the amount of the polymer added. Conventional lipophilic asphalt emulsion has been prepared without the addition of a polymer, but in the present invention, a polymer, in particular, a rubber-based polymer (SBS, SBR, Crumb Rubber, natural rubber, IsopreneRubber, various other rubber and various rubber powder, etc.) By adding, it was possible to improve the elasticity and viscosity of the package, and thus it is expected to greatly increase the resistance to fatigue cracking, plastic deformation, and various cracks. In addition, by using an oil or organic solvent which is insoluble in water, unlike lipophilic asphalt emulsion, there was no effect on strength even when exposed to moisture or water.

Claims (3)

Preparing a lipophilic composite solvent emulsion by dissolving some or all of petroleum oil, an organic solvent, a polymer synthetic resin, and asphalt; Recycling ascon production method using a lipophilic composite solvent comprising the step of mixing an appropriate amount of aggregated fine powder such as stone powder, cement and waste ascon with the solvent oil at room temperature. The method of claim 1, Ascon manufacturing method further comprising the step of preparing a new ascon by mixing an appropriate amount of the new aggregate in the emulsion at room temperature. Placing the asphalt concrete prepared according to claim 1 or 2 on a road using a laying equipment; Compacting the asphalt concrete installed on the road using compaction equipment, Heating the compacted package to 50-120 ^° C., in order to shorten the curing time, Ascon packaging method using a lipophilic solvent emulsion comprising the step of recovering the solvent in order to prevent pollution due to volatile solvent.