KR102020594B1 - Recycled cold asphalt concrete mixture and Construction thereof - Google Patents

Abstract

The present invention relates to a room temperature regenerated asphalt composition and an asphalt concrete construction method using the same and, more specifically, to a room temperature regenerated asphalt composition comprising a circulating aggregate, a new aggregate, a binder, and a solid additive, prevents problems such as cracking and strength reduction at an initial stage of construction, and has excellent physical properties which meet the asphalt quality specifications even if constructed at the room temperature.

Description

Recycled cold asphalt concrete mixture and construction method

The present invention relates to a room temperature reclaimed asphalt composition and an asphalt concrete construction method using the same, and more particularly, including a circulating aggregate, a new aggregate, a binder, and a solid additive, to prevent problems such as the occurrence of cracking and strength reduction at the initial stage of construction. The present invention relates to a room temperature regenerated asphalt composition having excellent physical properties that satisfy the asphalt quality specification even when constructed at room temperature, and an asphalt concrete construction method using the same.

Domestic roads have a higher rate of increase in traffic volume than road growth rate, so the incidence of pavement cracks is high, and such cracks can easily penetrate, causing pavement roads to break prematurely. Asphalt asphalt concrete (hereinafter referred to as waste asphalt) generated by replacement works such as city gas, water supply and sewage sewerage, as well as asphalt concrete repair and repair of roads due to such early breakage of pavement, It is a significant part.

Unlike the waste concrete, which is the most generated by-product of the construction industry, such waste ascon cannot be used for concrete, backfill, and auxiliary bases because the asphalt emulsion is attached to the aggregate surface. In addition, landfilling of waste ascon is a major cause of environmental pollution, such as asphalt or residual cement washed out from landfill by rainwater, and contaminates groundwater and rivers. Is being raised.

The recycling of waste ascon generated in large quantities is drawing attention as an alternative to replace the explosive demand for asphalt while reducing environmental pollution. As the research on the recycled asphalt concrete has been actively conducted, plant hot mix recycling and hot in-place surface recycling have been developed.

Both the plant method and the surface regeneration method have to be installed by heating because it is difficult to install at room temperature. In the case of heated asphalt, high heat is generated during the construction process, which generates high CO ₂ and harmful gases, accelerating global warming, In addition to damage to health, there is a problem that early cracking or destruction of the road paving.

In order to solve this problem, researches on the recycling of waste ascons by using recycled aggregates derived from waste ascons with emulsion asphalt at room temperature have been actively conducted. Ascon is designated as a designated by-product, and the “Act on the Promotion of Recycling of Construction Waste” and the “Circulation Aggregate Quality Standard” have been enacted to improve the recycling rate of waste ascon while maintaining the high quality of ascon.

However, the waste ascon produced by this recycling method has a problem in that the initial mixture is easily detached because the binding force between particles is not large at the initial stage of construction, and the distribution of waste ascon circulating aggregate particles is not constant, thereby satisfying the quality standards of the asphalt mixture. There was a problem that was difficult to make.

Registered Patent No. 1141259 (registered May 4, 2012)

In the present invention, including recycled aggregates, new aggregates, binders and solid additives, to prevent problems such as the occurrence of cracks and strength reduction during the initial stage of construction, and even at room temperature, the room temperature reclaimed asphalt composition of excellent physical properties that satisfy the asphalt quality standards and To provide an asphalt concrete construction method using the same.

One embodiment of the present invention for achieving the above object is directed to a room temperature regenerated asphalt composition, the room temperature regenerated asphalt composition is 45 ~ 72% by weight recycled aggregate, 16 ~ 40% by weight new aggregate, binder 5 ~ 11 weight percent and 2-6 weight percent of solid additives.

The circulating aggregate, circulating aggregate having a maximum particle size of 20 mm and circulating aggregate having a maximum particle size of 10 mm may be mixed in a weight ratio of 1: 2.6 to 3.5.

The new aggregate may be a mixture of a grade 1 aggregate and a general aggregate of 1: 0.5 to 0.8 weight ratio of the segregation content is less than 10% by weight.

The binder may include 30 to 51 wt% emulsified asphalt, 5 to 12 wt% cement, and the balance of water.

The solid additive, blast furnace slag and gypsum may be mixed in a weight ratio of 1: 0.02 ~ 0.14.

On the other hand, another embodiment of the present invention relates to a construction method of the room temperature regenerated asphalt composition, and more specifically, the screening step of selecting the crushed recycled aggregate, new aggregate by size; 45 to 72 wt% of the recycled aggregate, 16 to 40 wt% of the new aggregate, 5 to 11 wt% of the binder, and 2 to 6 wt% of the solid additives to prepare a room temperature regenerated asphalt composition; A laying step of laying the room temperature regenerated asphalt composition; And a compacting step of compacting the installed room temperature regenerated asphalt composition.

At this time, the aggregate contained in the room temperature regenerated asphalt composition prepared in the mixing step may have an optimum moisture content.

The binder may include 30 to 51 wt% emulsified asphalt, 5 to 12 wt% cement, and the balance of water.

The mixing step, the first mixing step of mixing the recycled aggregate, aggregate aggregate, solid additives and some water; A second mixing step of adding and mixing the emulsion asphalt and the remaining water to the mixture obtained through the second mixing step; And a third mixing step of adding and mixing cement to the mixture obtained through the second mixing step.

When paving the road using the room temperature reclaimed asphalt composition of the present invention, it is possible to prevent problems such as the occurrence of cracking and strength reduction at the beginning of the construction, and even if the construction at room temperature has the advantage of having excellent physical properties that meet the asphalt quality standards .

Prior to the following description in detail through the preferred embodiment of the present invention, terms or words used in the present specification and claims should not be construed as limited to the conventional or dictionary meanings, meanings corresponding to the technical spirit of the present invention To be interpreted as

Throughout this specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless otherwise stated.

In each step, the identification code is used for convenience of explanation, and the identification code does not describe the order of each step, and each step may be performed differently from the stated order unless the context clearly indicates a specific order. have. That is, each step may be performed in the same order as specified, may be performed substantially simultaneously, or may be performed in the reverse order.

As described above, in order to recycle the waste asphalt generated during the repair of asphalt concrete roads and the conduit of gas pipes or water pipes, a heating method for heating and recycling waste ascon has been mainly used. There is a problem that the global warming is accelerated by a large amount of CO ₂ generated in the, and not only the environment is polluted by the harmful gas generated during heating, but also harm the health of workers.

Accordingly, the present invention is to recycle the waste ascon at room temperature without heating, and to provide a room temperature circulating asphalt composition excellent in workability and workability, and excellent construction properties and durability of the pavement after construction even when working at room temperature, and construction methods using the same do.

Room temperature circulating asphalt composition according to an embodiment of the present invention includes 45 to 72% by weight of circulating aggregate, 16 to 40% by weight of new aggregate, 5 to 11% by weight of binder and 2 to 6% by weight of solid additive.

The recycled aggregate is included in the room temperature reclaimed asphalt composition of the present invention to not only improve the flexibility of the pavement road, but also to recycle waste resources, and the waste concrete and waste asphalt concrete that have undergone physical or chemical treatment with such recycled aggregates. Can be used.

Such recycled aggregate is aggregate that satisfies the provisions of Article 2 (7) of the Act on the Promotion of Recycling of Construction Waste (conformity of construction waste to the quality standard under Article 35 through physical or chemical treatment process, etc.), Preferably, according to KSF 2572 specification, a circulating aggregate in which a maximum aggregate particle size of 20 mm passed through a 20 mm sieve and a maximum aggregate particle size of 10 mm passed through a 10 mm sieve may be used.

More preferably, a maximum aggregate particle size of 10 mm that passes through a 10 mm sieve without passing through a circulating aggregate having a maximum particle size of 20 mm and a 8 mm sieve without passing through a 15 mm sieve is not passed. Recycled aggregates may be used in which recycled aggregates are mixed at a weight ratio of 1: 2.6 to 3.5.

The weight ratio of the circulating aggregate having a maximum particle size of 10 mm fills the gap formed between the circulating aggregate having a maximum particle size of 20 mm and the new aggregate, which will be described later. If the weight ratio of the recycled aggregate having a maximum particle size of 10 mm to the recycled aggregate having a maximum particle size of 20 mm is less than the above range, it is insufficient to fill the gap between the aggregates, causing problems such as sedimentation and breakage of the pavement due to the load. May occur, and if it exceeds the above range, there is a problem that it is difficult to secure sufficient porosity of the pavement.

Such recycled aggregates are used for the effect of recycling waste resources, increasing the flexibility of the pavement and improving the strength of the pavement by reducing the absorption rate during construction, and may be included in the weight range of 45 to 72% by weight in the total room temperature reclaimed asphalt composition. . When the content of the recycled aggregate is less than 45% by weight, it is difficult to obtain the above-described effect by the recycled aggregate, and when the content of the recycled aggregate exceeds 72% by weight, the effect of reducing water absorption is further increased. Since this is relatively insufficient and the strength decreases due to lack of bonding strength between aggregates, it is preferable to be included within the above-described weight range.

In this case, when the coated recycled aggregate is used rather than the general recycled aggregate, a network structure is formed between the aggregate and the aggregate so that the other components may be evenly filled in the gap of the aggregate, and the adhesive strength and tensile strength during the construction increase the asphalt. It can improve concrete durability.

In order to achieve this effect, the coated recycled aggregate coated with an acrylic resin may be used. Preferably, the coating amount may be coated with 0.01 to 10 parts by weight of the acrylic resin based on 100 parts by weight of the recycled aggregate. Acrylic resins can be used.

The new aggregate is a natural aggregate that satisfies the KSF 2357 standard, and has higher strength, lower wear rate, and higher overall physical properties than circulating aggregate, and thus is used to express strength and durability of pavement and to improve physical properties. New aggregate used in the present invention may be used that the maximum particle size of 25 mm or less.

Such new aggregates may be included in the total room temperature regenerated asphalt composition in 16 to 40% by weight, when included in less than 16% by weight, it is difficult to secure sufficient strength and durability of the pavement, if it exceeds 40% by weight Since the strength and durability of the pavement can be reduced by increasing the absorption rate and decreasing the binding force between the aggregates, it is preferably included within the above-described weight range.

At this time, the new aggregate is preferably used that the first grade aggregate and general aggregate mixed with the segregation content of 10 wt% or less. The flagstone is classified according to the granularity of the aggregate, and means aggregate having a ratio of width to particle thickness or a ratio of length to width of three times or more. In general aggregates, the content of the segregation is high, which lowers the plastic deformation resistance of the asphalt composition including such aggregates, resulting in deterioration of the durability and lifespan of the pavement. Therefore, in the present invention, by using the first-grade aggregate having a segregation content of 10% by weight or less with general aggregate, it is intended to improve the durability and lifespan of the pavement.

The weight ratio of the first grade aggregate and the general aggregate may be 1: 0.5 to 0.8, but the weight ratio of the general aggregate to the first grade aggregate is less than 0.5, which is economically unfavorable. Since it is difficult to obtain the durability and life improvement effect due to the reduction, it is preferable to use a new aggregate aggregate of the first-grade aggregate and the general aggregate in the above weight ratio.

The binder is added to express the strength, durability and other physical properties of the pavement by improving the bonding strength between the components included in the room temperature reclaimed asphalt composition, may be included in 5 to 11% by weight, less than 5% by weight If it is included, there is a problem that it is difficult to sufficiently secure the bonding force between the components, such as detachment of aggregates, cracks, breakage of the pavement easily occurs. In addition, if the content exceeds 11% by weight, the content of the aggregate having high strength may be lowered, and thus the strength of the pavement may be lowered.

As the binder, a mixture of emulsified asphalt, cement and water may be used. Preferably, a mixture of 30 to 51 wt% of emulsified asphalt, 5 to 12 wt% of cement and a balance of water may be used.

The emulsified asphalt serves as a binder for bonding each component included in the room temperature regenerated asphalt composition at room temperature, thereby allowing construction at room temperature. As it can be installed at room temperature, CO ₂ or harmful gases are not generated during construction, which can reduce environmental pollution, and surfactants are contained in the emulsified asphalt to improve dispersion and miscibility of each component. It can lower and improve workability. In addition, there is an advantage that other materials can be mixed in a chemically stable state by preventing the generation of heat and the like by not generating heat in the mixing process.

As the emulsified asphalt, RSC-1, 2, 3, 4, MSC-1, 2, 3, 4 or SSC-1, 2, 3, 4, etc., which are defined in the KS standard, may be used. SSC-based emulsion asphalt containing a cationic asphalt emulsifier, which is excellent in adhesion and has a rapid decomposition progress of the emulsion particles, and can achieve traffic opening within a relatively short time, more preferably SSC-1h can be used.

Such emulsified asphalt may be included in the binder in 30 to 51% by weight, when contained in less than 30% by weight is not only difficult to install at room temperature, the above-mentioned effect is not obtained, and when the content exceeds 51% by weight The effect obtained is insignificant compared to the content of asphalt, which is not economically desirable.

The cement is an inorganic bonding hardener including lime, silica, alumina, iron oxide, and the like. The cement is hardened by reacting with water, and is a binder for firmly bonding components, such as aggregate, that are mixed together during the curing process. Plays the role of. As such cement, cement commonly used in the art may be used. For example, Portland cement, crude steel cement, pozzolanic cement, medium heat cement, low heat cement, white cement, cemented carbide, etc. may be used. However, it is not limited thereto.

In general, cement generates heat in the process of curing by reacting with water, and the heat of hydration generates a temperature difference between the surface and the inside, which causes a problem of cracking on the pavement. However, by adjusting the heat of hydration to an appropriate level it is possible to improve the binding force, miscibility, dispersibility, etc. of the emulsified asphalt.

In one embodiment of the present invention, the cement is contained in 5 to 12% by weight to secure the bonding strength and the proper heat of hydration due to the cement. When the content of cement is less than 5% by weight, it is difficult to sufficiently secure such heat of hydration, and when the content of cement exceeds 12% by weight, cracking of the pavement is caused by excessive heat of hydration.

The water is added to disperse each component included in the room temperature regenerated asphalt composition, improve miscibility, and harden the cement, and remain in a mixture of 30 to 51 wt% emulsified asphalt and 5 to 12 wt% cement. It may be included as.

The solid additive is added to the purpose of filling the aggregate gap and at the same time to improve the bonding strength between each component, improve the construction properties of the room temperature reclaimed asphalt composition, improve the strength and physical properties of the pavement, 2 to 6 weight If included in less than 2% by weight, it is difficult to obtain the above-described effect, when contained in more than 6% by weight, the content of aggregate and binder is relatively reduced, rather the strength and durability of the pavement Since it falls, it is preferable to be included in the weight range mentioned above.

As a solid additive, a mixture of blast furnace slag and gypsum may be used, and a mixture of blast furnace slag and gypsum in a weight ratio of 1: 0.02 to 0.14 may be used.

The blast furnace slag comprises a a slag materials quenching the molten slag of high temperature into the pressure can be a drying, pulverization, SiO _2, Al ₂ O _3, CaO, MgO, TiO _2, Fe ₂ O _3, such as, SiO ₂ Since silicon and oxygen are networked to facilitate the penetration of hydroxyl groups in the alkaline solution, the network structure is destroyed by the intrusion of hydroxyl groups, the hydration reaction and the curing reaction occur rapidly, and the strength of the initial construction is improved by the blast furnace slag. There is this.

In particular, this initial strength improvement effect is more effective when the specific surface area is 4,000 ~ 6000 cm ² / g, preferably 5000 ~ 6000 cm ² / g, the specific surface area is 4,000 in the room temperature reclaimed asphalt composition of the present invention By including the blast furnace slag of ˜6000 cm ² / g, preferably 5,000 to 6000 cm ² / g, the strength of the pavement at the initial stage of construction can be improved.

On the other hand, gypsum has the property of absorbing water to expand the volume, and serves to suppress the above-mentioned shrinkage crack by supplementing the curing shrinkage of cement.

Gypsum has the effect of suppressing shrinkage cracking and acting as a reaction accelerator for the blast furnace slag, which helps to develop strength by the blast furnace slag and improves workability.

As described above, blast furnace slag and gypsum may be used in a weight ratio of 1: 0.02 to 0.14 as a solid additive. When the weight ratio of gypsum to blast furnace slag is less than 0.02, the content of gypsum is low, thereby suppressing shrinkage cracks caused by gypsum and strength And it is difficult to obtain a workability improvement effect, if it exceeds 0.14, it is preferable to include within the above-described weight range because there is a problem that the volume of the gypsum expands due to the absorption of moisture due to the gypsum content, causing cracks. Do.

The recycled aggregate and new aggregate included in the room temperature regenerated asphalt composition including the materials described above have an optimum moisture content, so that moisture mixed together in the process of mixing the aggregate and other materials is not absorbed into the pores in the aggregate. Since water can be used for miscibility with other materials and curing reactions such as cement, there is an advantage in that problems such as a decrease in miscibility, a decrease in strength, and cracks due to lack of water or excessive water during mixing do not occur. The optimum water content is preferably 3.5 to 4.1% by weight to achieve this effect.

On the other hand, another embodiment of the present invention relates to a pavement construction method using the room temperature regenerated asphalt composition according to the above-described embodiment, the screening step of selecting the crushed recycled aggregate, new aggregate by size; 45 to 72 wt% of the recycled aggregate, 16 to 40 wt% of the new aggregate, 5 to 11 wt% of the binder, and 2 to 6 wt% of the solid additives to prepare a room temperature regenerated asphalt composition; A laying step of laying the room temperature regenerated asphalt composition; And a compacting step of compacting the installed room temperature regenerated asphalt composition.

The sorting step is a step of screening the crushed recycled aggregates and new aggregates by size, preparing a recycled aggregate having a maximum particle size of 20 mm and 10 mm, respectively, and preparing a new aggregate having a maximum particle size of 25 mm.

The mixing step is a step of mixing 45 ~ 72% by weight of the circulating aggregate, 16 to 40% by weight of the new aggregate and 5 to 11% by weight of the binder and 2 to 6% by weight of the solid additive at room temperature. In this case, the binder may include 30 to 51% by weight of the emulsified asphalt, 5 to 12% by weight of cement and the remaining amount of water, and the above-mentioned materials are overlapped because they are the same as described above in the embodiment of the present invention. Description is omitted.

The mixing step may be carried out through a multi-step mixing method, specifically, the first mixing step of mixing the circulating aggregate, new aggregate, solid additives and some water; A second mixing step of adding and mixing the emulsion asphalt and the remaining water to the mixture obtained through the first mixing step; And a third mixing step of adding and mixing cement to the mixture obtained through the second mixing step.

In particular, in the first mixing step, the aggregates may be more uniformly dispersed by mixing some water together and the solid additives at the same time, and the moisture in the interior pores of the aggregate so that the aggregate has an optimum moisture content. This quickly and efficiently penetrates, and the solid additive is coupled to the surface of the aggregate, there is an effect that improves the binding strength of the aggregate and emulsion asphalt, cement.

In addition, unlike the present invention, when all the components are mixed at the same time, the dispersion of the components is not made uniformly takes a longer time to agitate, there is a disadvantage that the physical properties of the pavement is not formed uniformly, as in the present invention In the case of using a multi-stage mixing method, such a problem does not occur, and there is an advantage in that the bonding force between the aggregates is more firmly formed.

The recycled aggregate and the new aggregate contained in the room temperature regenerated asphalt composition prepared through the mixing step of the multi-stage mixing method have an optimum moisture content, so that the moisture mixed together in the process of mixing the aggregate and other materials is absorbed into the pores inside the aggregate. Most of the water can be used for mixing with other materials and curing reactions such as cement, and thus there is an advantage in that problems such as a decrease in miscibility due to lack of water or excessive water, a decrease in strength, and cracking occur. The optimum water content is preferably 3.5 to 4.1% by weight to achieve this effect.

On the other hand, the step of pretreating the circulating aggregates selected between the screening step and the mixing step may be carried out, specifically, the circulating aggregates are supported on an organic solvent containing an acrylic resin, preferably an aromatic hydrocarbon-based acrylic resin for a predetermined time After being left, the pretreatment step of coating the acrylic resin on the recycled aggregate may be performed by taking out the recycled aggregate and drying it.

The acrylic resin is coated on the surface of the circulating aggregate through this pretreatment step to form a network structure between the aggregate and the aggregate during construction so that other components can be evenly filled in the gaps between the aggregates, and improve the adhesion between the components to improve the tension on the pavement. Strength can be improved.

At this time, the coating amount of the acrylic resin is preferably 0.01 to 10 parts by weight of the acrylic resin with respect to 100 parts by weight of the circulating aggregate.

The installation step is a step of laying the room temperature reclaimed asphalt composition prepared through the mixing step on the ground on which the pavement is to be formed, the compacting step is a room temperature regeneration by pressing the installed room temperature regenerated asphalt composition using a roller to discharge air Densely forming the bonds between the components in the asphalt composition, it can be carried out using a tandem roller, makadem roller and the like.

Hereinafter, an embodiment of the present invention will be described. However, the scope of the present invention is not limited to the following preferred embodiments, and those skilled in the art can implement various modified forms of the contents described herein within the scope of the present invention.

[ Production Example  One]

735 g of circulating aggregate with a maximum particle size of 20 mm, 2,300 g of circulating aggregate with a maximum particle size of 10 mm, 830 g of grade 1 new aggregate aggregate with a maximum particle size of 25 mm and 7% segregation, and 550 g of general new aggregate with a maximum particle size of 25 mm , 200 g of solid additive, which is a mixture of blast furnace slag and gypsum and 100 g of water, are mixed and stirred, followed by mixing 155 g of emulsified asphaltene SSC-1h ^® (East-West Emulsification) and 100 g of water, and stirring 30 g of Portland cement. The mixture was stirred to prepare a room temperature regenerated asphalt composition.

The recycled aggregate used herein was coated with benzyl methacrylate, and the blast furnace slag used a specific surface area of 5,500 cm ² / g, and the weight ratio of blast furnace slag and gypsum as a solid additive is shown in Table 1 below. The compositions of Examples 1 to 4 and Comparative Examples 1 and 2 were prepared by changing.

(Weight ratio) Comparative Example 1 Example 1 Example 2 Example 3 Example 4 Comparative Example 2 Blast furnace slag One One One One One One gypsum 0.01 0.02 0.05 0.10 0.14 0.15

[ Experimental Example  One]

Test specimens were prepared using the room temperature regenerated asphalt composition prepared in Preparation Example, and the results are shown in Table 2 after measuring the physical properties of each specimen.

First, each room temperature regenerated asphalt composition was put into a specimen mold to prepare a specimen having a diameter of 101.6 mm and a thickness of 63 mm. The test was carried out according to the asphalt concrete pavement construction guidelines (2017) provided by the Ministry of Land, Infrastructure and Transport, using specimens prepared after demoulding after curing for 24 hours at. In addition, after curing, the surface of the specimen was observed to determine whether cracking occurred.

standard Comparative Example 1 Example 1 Example 2 Example 3 Example 4 Comparative Example 2 Marshall Stability
(N, 40 ℃) 6,000
More than 14,250 15,845 17,240 17,925 18,120 19,140 Flow value
(1/100 cm) 10-40 44 40 39 37 35 35 Porosity (%) 9-14 13.2 12.4 11.3 10.6 9.8 9.3 Indirect tensile strength
(MPa, 25 ℃) 0.4
More than 0.36 0.42 0.46 0.50 0.52 0.38 Tensile Strength Ratio
(TSR) 0.7
More than 0.60 0.72 0.75 0.77 0.79 0.70 Crack occurrence Not Occurred Occur Not Occurred Not Occurred Not Occurred Not Occurred Occur

Referring to the experimental results of Table 2, in the case of Example 1 to Example 4, it was confirmed that each item satisfies the reference value and has excellent physical properties. However, Comparative Example 1 did not meet the criterion in the flow value, indirect tensile strength and tensile strength ratio, and appeared to have poor physical properties, in the case of Comparative Example 2 was shown that the indirect tensile strength does not meet the criteria, In both comparative examples, it was confirmed that the specimens had cracks after curing.

In the case of Comparative Example 1 because the gypsum content of the blast furnace slag is insufficient, the above results were found to be due to the insufficient effect as a curing agent to suppress the shrinkage cracking by the gypsum and to develop the strength of the blast furnace slag, In this case, the gypsum content is excessive, the gypsum absorbs water, expands, and increases the amount of uncured blast furnace slag and cement.

Therefore, in order to ensure sufficient strength and excellent physical properties of the pavement constructed using the room temperature reclaimed asphalt composition of the present invention from the experimental results of Experimental Example 1, the weight ratio of blast furnace slag and gypsum added as a solid additive is 1: 0.02 ~ It was confirmed that it is preferable that it is 0.14.

[ Experimental Example  2]

Experimental Example 2 using the Comparative Example 3 prepared by the method for preparing a room temperature regenerated asphalt composition having the same composition as in Example 3 prepared in Preparation Example 1, but mixing each component at the same time without using a multi-step mixing method The same experiment as is performed and the results are shown in Table 3.

Comparative Example 3 Example 3 Marshall stability (N, 40 ℃) 14,670 17,925 Flow value (1/100 cm) 33 37 Porosity (%) 13.2 10.6 Indirect tensile strength (MPa, 25 ℃) 0.39 0.50 Tensile Strength Ratio (TSR) 0.68 0.77 Crack occurrence Not Occurred Not Occurred

Referring to the experimental results of Table 3, it was confirmed that in the case of Comparative Example 3, which does not use a multi-step mixing method, Marshall stability, flow value, and strength were lowered and the porosity was higher than that of Example 3. This is confirmed as a result of not mixing enough of each material because the multi-stage mixing method according to an embodiment of the present invention is not used.

In particular, the indirect tensile strength and tensile strength ratio of Comparative Example 3 was not only significantly lower than that of Example 3, but appeared to fall below the construction guidelines, when constructing the asphalt pavement using the room temperature reclaimed asphalt composition of the present invention, According to the construction method according to an embodiment of the present invention it was confirmed that it is preferable to mix each material using a multi-step mixing method.

The present invention is not limited to the above specific embodiments and descriptions, and various modifications can be made by those skilled in the art without departing from the gist of the invention as claimed in the claims. Such variations are within the protection scope of the present invention.

Claims (8)

45 to 72% by weight of circulating aggregate, 16 to 40% by weight of new aggregate, 5 to 11% by weight of binder and 2 to 6% by weight of solid additives,
The binder, 30 to 51% by weight emulsified asphalt, 5 to 12% by weight of cement and the balance of water,
The solid additive is a mixture of blast furnace slag and gypsum in a weight ratio of 1: 0.02 to 0.14,
The circulating aggregate, circulating aggregate having a maximum particle size of 20 mm and circulating aggregate having a maximum particle size of 10 mm are mixed at a weight ratio of 1: 2.6 to 3.5,
The new aggregate, the first-grade aggregate and the general aggregate of the segregation content is less than 10% by weight, but is mixed in a weight ratio of 1: 0.5 to 0.8,
Aggregate consisting of recycled aggregate and new aggregate has the optimum moisture content of 3.5-4.1wt%, room temperature recycled asphalt composition delete delete delete delete Selecting step of selecting the crushed circulating aggregate, new aggregate by size;
45 to 72 wt% of the recycled aggregate, 16 to 40 wt% of the new aggregate, 5 to 11 wt% of the binder, and 2 to 6 wt% of the solid additives to prepare a room temperature regenerated asphalt composition;
A laying step of laying the room temperature regenerated asphalt composition; And
It includes; compacting step of compacting the installed room temperature reclaimed asphalt composition,
Aggregate included in the room temperature regenerated asphalt composition prepared in the mixing step has an optimum moisture content of 3.5-4.1wt%,
The binder, 30 to 51% by weight emulsified asphalt, 5 to 12% by weight of cement and the balance of water,
The solid additive is a mixture of blast furnace slag and gypsum in a weight ratio of 1: 0.02 to 0.14,
The circulating aggregate, circulating aggregate having a maximum particle size of 20 mm and circulating aggregate having a maximum particle size of 10 mm are mixed at a weight ratio of 1: 2.6 to 3.5,
The new aggregate is a construction method of a room temperature regenerated asphalt composition, characterized in that the first-grade aggregate and the general aggregate of the segregate content of 10 wt% or less are mixed in a weight ratio of 1: 0.5 to 0.8. delete The method of claim 7, wherein the mixing step,
A first mixing step of mixing the circulating aggregate, new aggregate, solid additive and some water;
A second mixing step of adding and mixing the emulsion asphalt and the remaining water to the mixture obtained through the first mixing step; And
And a third mixing step of adding and mixing cement to the mixture obtained through the second mixing step.