KR101696402B1 - Powder type additive composition for recycled asphalt concrete and a preparation method thereof - Google Patents

Abstract

The present invention relates to a powder type additive for recycled asphalt consisting of 15-50 wt% of process oil, 20-70 wt% of oil inclusion, 3-20 wt% of a tackifier, 5-30 wt% of a polymer modifier, 4-20 wt% of a viscosity controlling agent, 2-10 wt% of an anti-stripping agent, and 1-10 wt% of a specific compatibilizing agent, and to a mixture for recycled asphalt concrete in which 0.1-0.5 wt% of the additive is mixed with respect to asphalt concrete in an existing recycled asphalt mixture. Accordingly, provided are a granular powder type additive for recycled, modified asphalt and a mixture for recycled, modified asphalt capable of packaging recycled and modified asphalt concrete with excellent quality.

Description

TECHNICAL FIELD [0001] The present invention relates to a particulate powder type regenerated asphalt concrete additive composition and a method for producing the same,

The present invention relates to a regenerated or regenerated modified asphalt (hereinafter referred to as 'regenerated asphalt') composition used for road pavement construction in the construction or repair of roads and a granular powdered regenerated asphalt additive used therein, The regenerated asphalt additive is in the form of a liquid phase or a gel phase, and is intended to solve the inconvenience that the product is used or stored during storage.

Particularly, in order to use or store, it is necessary to have a dedicated tank and pump facility which can be heated, and the product transfer pipe must also be able to be heated. In addition, when the continuous heating process is repeated over a long period of time, There is a problem that it is difficult to ensure uniform and excellent physical properties of the recycled asphalt mixture. That is, since there is a disadvantage that it is required to be heated before use and that the product is heated and used every time it is used, there is a disadvantage that the heating and cooling of the product are repeated and physical properties are changed.

The present invention is to provide a granular powdery regenerated asphalt additive in order to effectively overcome the problems of the conventional product, to ensure convenience in use and storage, and to provide a homogeneous and excellent physical property of the regenerated asphalt mixture .

The present invention relates to a regenerated asphalt, a regenerated modified asphalt additive, a regenerated asphalt concrete or a regenerated modified asphalt concrete which has become a recent issue and which is easy to use and store, is an environmentally friendly and economical granular powder regenerated or regenerated modified asphalt additive, Or regenerated asphalt concrete mixture.

Conventional regenerated asphalt additives are mostly products that are melt-dispersed or simply mixed with polymer or resin based on process oil, and thus can not be packed in small quantity suitable for an asphalt concrete production plant. Therefore, they are packed in bulk or drum and transported It is necessary to store the product in a private tank, and there is a problem that the product must be heated and transported to a pump or the like for use. That is, phase separation between the constituents is likely to occur due to heating and cooling of the product, and it is difficult to produce a uniform and excellent regenerated asphalt mixture.

In recent years, the demand for recycled asphalt concrete in road pavement has been increasing steadily in terms of revision, environmental and economic aspects of the related laws. However, the supply of asphalt concrete has not been smoothly supplied. Especially, Physical properties such as strength of concrete mixture, low temperature cracking resistance performance, and water resistance performance are required to have physical properties such as general and polymer modified asphalt concrete mixture level. However, existing regenerated or regenerated modified asphalt concrete mixture has properties of general and polymer modified asphalt It has the disadvantage that it does not reach the level of the mixture or the price is not competitive even if the properties are satisfactory.

The present invention overcomes the problems of the prior art and provides a granular powdery regenerated asphalt additive which can be used to provide a recycled asphalt mixture excellent in physical properties and excellent in price competitiveness, It is an object of the present invention to provide an excellent regenerated asphalt additive or a regenerated asphalt concrete mixture.

In addition, in order to reduce the emission of carbon dioxide caused by the use of fossil fuel, which is a cause of problems such as abnormal climate and global warming, which is a problem in the world, it is further demanded to develop an eco-friendly product which generates less carbon dioxide. In the case of the granular powdery regenerated asphalt additive of the present invention and the regenerated asphalt concrete containing the same, it is possible to lower the production and the construction temperature by about 10 to 20 ° C, thereby providing a product which is more economical and environmentally friendly.

Japanese Patent Laid-Open No. 1997-025416 (published on January 28, 1997)

The present invention provides a reclaimed asphalt concrete mixture which is more environmentally friendly and has excellent physical properties by providing a regenerated asphalt concrete mixture and a granular powdery regenerated asphalt additive or regenerated modified asphalt additive to be used therein. .

Further, unlike a liquid or gel type product such as a conventional regenerated asphalt additive, the present invention is convenient in use because it is in the form of powder or granule, and does not cause leaching of the oil component and phase separation of the material. Therefore, Can be provided.

The granular powdery regenerated asphalt additive of the present invention is a chemical reaction type product. The aged asphalt can be restored to its asphalt state through the chemical reaction as much as possible and the chemical components can be chemically combined with the asphalt molecules It is possible to obtain a highly uniform modified asphalt and exhibit excellent physical properties.

In order to solve the problems of the prior art, and to achieve the object to be solved by the present invention, the granular powdery regenerated asphalt additive of the present invention comprises

The present invention relates to a regenerated asphalt additive and a method for producing the same, and is capable of providing a regenerated asphalt additive which is easy to use and store, is environmentally friendly, and is economical.

The present invention provides a regenerated or regenerated modified asphalt mixture having excellent physical properties and low cost and a granular powder type regenerated or regenerated modified asphalt additive used therein, which is a granular powder-type regenerated asphalt which is convenient to store, transport and use, It is effective to provide an additive or a regenerated asphalt concrete mixture.

Further, the granular powdery regenerated asphalt additive of the present invention and the recycled asphalt concrete mixture containing the reclaimed asphalt concrete admixture of the present invention are advantageous in that they can be economically and environmentally friendly.

To attain the above object, the granular powdery regenerated asphalt additive of the present invention comprises 15 to 40 parts by weight of process oil, 27 to 52 parts by weight of an oil-in-fluid, 3 to 20 parts by weight of a tackifier, 5 to 30 parts by weight of a polymer modifier 4 to 20 parts by weight of a viscosity modifier, 2 to 10 parts by weight of an anti-peeling agent, and 1 to 10 parts by weight of a special compatibilizing agent.

Also, it is possible to provide a regenerated asphalt concrete mixture by adding 0.1 to 0.5 part by weight of the granular powdery regenerated asphalt additive of the present invention to a conventional regenerated asphalt mixture. Hereinafter, the present invention will be described in more detail.

The granular powdery regenerated asphalt additive according to an embodiment of the present invention includes process oil, oil-in-oil tackifier, polymer modifier, viscosity modifier, anti-peeling agent and special compatibilizer.

The process oil may be any one of naphthenic, aromatic, paraffinic oils and oils obtained by mixing at least two or more of them. When the composition ratio is less than 15 parts by weight, It is difficult to restore the aged asphalt to the original asphalt state and thus it is difficult to expect good physical properties. When the composition ratio of the process oil is more than 40 parts by weight, the amount of the component is too large and the physical properties of the recycled asphalt mixture And the oil is leached when the additive is prepared and packed and stored, resulting in a problem that it can not be used as an additive for a normal product.

The oil-impregnated fluid is a material used for imparting a function of containing the process oil used together as much as possible so that the process oil can be maintained in granular or powder form without being leached even after the additive product is completed, Concretely, wood flour, rice hull flour, or a mixture thereof can be used.

Particularly, it is preferable that the wood powder and the rice husk powder have a particle diameter of 1.5 mm or less. The wood powder is prepared by grinding sawdust or waste wood with a pulverizer or a grinder. The wood powder is preferably about 30 to 100 mesh, The rice husks are dried and crushed to have a particle size range of 30 to 100 mesh. NNP is commercially available from Yukuba Chemical Co., Ltd.

The amount of the oil-based fluid used in the present invention is preferably in the range of 27 to 52 parts by weight. When the amount of the oil-less fluid is less than 27 parts by weight, the amount of the oil is smaller than that of the process oil. And when it exceeds 52 parts by weight, relatively different components are so small that it is difficult to secure excellent physical properties of regenerated modified asphalt concrete

The tackifier improves the adhesion performance of the aggregate and the asphalt and improves the water resistance performance. The tackifier can be used as a natural resin such as rosin, C5 or C9 petroleum resin, rosin ester, Any one of resins in which at least two or more resins are mixed can be used.

In the case of the rosin ester, there is an advantage that the resin such as rosin is obtained through the esterification reaction, and the adhesive strength is excellent and the odor-like odor is alleviated. GER-85, PER-90, PER-100, and the like.

If the amount of the tackifier is less than 3 parts by weight, the tackifier may be used in an amount of from 3 to 20 parts by weight. When the amount of the tackifier is less than 3 parts by weight, the adhesion performance between the aggregate and the asphalt is deteriorated There is a problem that the recycled asphalt concrete having excellent physical properties can not be produced because the water resistance performance is lowered.

On the other hand, when the amount of the tackifier is more than 20 parts by weight, the economical efficiency is low, and the proportion of the tackifier with other components is not adequate, and thus it is difficult to realize an additive having excellent physical properties.

The polymer modifier used in the granular powder-type regenerated or regenerated modified asphalt additive of the present invention plays a role of imparting elasticity, ductility, strength and low temperature characteristics to the asphalt, and it is preferable to use a styrene-butadiene block copolymer (SBS) (TPA), Trinidad Lake Asphalt (TLA), Bautoneol (TPA), Styrene-Butadiene Rubber (IIR), Isobutylene-Isoprene Rubber (also known as butyl rubber), APAO (Amorphous Poly- Natural asphalt such as asphalt (BRA), Gilsonite and the like may be used in the range of 5 to 30 parts by weight.

When the polymer modifier is used in an amount of less than 5 parts by weight, the amount of the polymer modifier is too small to sufficiently ensure the physical properties of the recycled asphalt concrete, and there is a high possibility that defects such as plastic deformation, portholes and fatigue cracks occur after the asphalt concrete pavement The strength and elasticity of the asphalt concrete are improved. However, since the viscosity of the product is too high, it is necessary to set the production temperature and the construction temperature so that the thermal aging of the polymer modifier and other components It may cause a problem that the other properties are weakened or the construction becomes difficult, and the possibility of occurrence of defects after construction is increased.

The viscosity modifier used in the granular powdery regenerated asphalt additive of the present invention can be suitably adjusted by controlling the viscosity of the asphalt to shorten the time for coating the asphalt on the aggregate surface, And further improves the quality of the asphalt concrete, and synthetic wax such as PE, PP and Amide, petroleum wax (micro wax), soap wax such as calcium stearate or zinc stearate, and the like can be used.

When the viscosity modifier is used in an amount of less than 4 parts by weight, the amount of the viscosity control agent is too small to control the viscosity. If the amount of the viscosity modifier is more than 20 parts by weight, the viscosity of the asphalt becomes too low to reduce the thickness of the aggregate, It is undesirable because it causes problems such as deteriorating the physical properties of the concrete or the aggregate being removed after the construction.

The anti-peeling agent used in the present invention functions to prevent peeling (asphalt) from aggregate of asphalt concrete and asphalt coated on the surface of the aggregate of the asphalt concrete. The anti-peeling agent includes a silane coupling agent such as calcium hydroxide, phosphoric acid ester, polyamine, aminosilane, Or a mixture of at least two of them may be used, and it is preferably used in a range of 2 to 10 parts by weight.

When it is used in an amount of less than 2 parts by weight, it is difficult to expect an effect of preventing peeling due to the use amount being too small, and when it is used in an amount exceeding 10 parts by weight, the amount of use thereof is increased more than necessary, There is a disadvantage that this is weakened.

The special compatibilizer improves the compatibility, stability and dispersibility of the asphalt with the constituents of the granular powdery regenerated asphalt additive of the present invention and enhances the physical properties of the asphalt concrete as a whole. , Sulfuric acid derivatives, adipic acid, oleic acid, phosphorus pentoxide, iron chloride, or a mixture of at least two or more of them may be used, and it is preferably used in the range of 1 to 10 parts by weight.

When the special compatibilizing agent is used in an amount of less than 1 part by weight, the amount of the special compatibilizing agent used is too small to expect improvement in compatibility, stability and dispersibility. If the amount is more than 10 parts by weight, And raise the price.

Hereinafter, a method for producing a granular powder-type regenerated asphalt additive according to another embodiment of the present invention will be described in detail.

The method for producing the granular powdery regenerated asphalt additive of the present invention includes the steps of charging an oil-in-fluid, a polymer modifier, a tackifier, and a viscosity modifier into a ribbon mixer, and stirring the mixture so as to be uniformly dispersed; Adding a process oil to a homogeneously dispersed primary agitated material and agitating it so that it is uniformly dispersed; And a third agitating step in which the anti-peeling agent and the special compatibilizing agent are added to the secondary agitated product in order regardless of the order, and the third agitating step is carried out in the order of the first to third agitating steps, To complete the granular powdery regenerated asphalt additive product of the present invention.

During the primary stirring step to the tertiary stirring step in the production process, the stirring speed and time should be controlled so that the temperature in the stirring tank is maintained at 60 캜 or lower. If the temperature in the stirring tank exceeds 60 캜, fusion may occur between the constituent components and may be deformed into a large lump, so that the temperature should not be exceeded. In particular, when the ribbon mixer is heated to smoothly produce the product during the winter season, care must be taken not to exceed the temperature of 60 ° C.

In the granular powder type regenerating and regenerating modified asphalt additive of the present invention, the multi-step stirring process is divided into the primary, secondary and tertiary stirring stages as described above. The process oil is coated in a state where the materials are uniformly dispersed, and the oil-containing material effectively absorbs the process oil, thereby preventing the materials from being bundled or tilted locally.

The reason why the anti-peeling agent and the special compatibilizing agent are added to the secondary dispersion to disperse is that the chemical reactivity of the anti-peeling agent and the special compatibilizer varies depending on the kind of the anti- In order to minimize changes in physical properties of the final product by mixing them in a coated state.

The regenerated asphalt concrete or regenerated modified asphalt concrete can be produced using the granular powdery regenerated asphalt additive of the present invention manufactured by the above-described method. More specifically, 25 to 77.9 parts by weight of waste asphalt concrete, 20 to 75 parts by weight of the reclaimed asphalt concrete and 2 to 7 parts by weight of the asphalt may be added in an amount of 0.1 to 0.5 part by weight to the regenerated asphalt concrete. Lt; / RTI >

Waste asphalt concrete and aggregate used during the manufacturing process of the regenerated asphalt concrete or regenerated modified asphalt concrete means the total amount of aggregates per each granularity. The ratio of aggregates to each granularity is determined according to the SPS standard KS).

When the amount of the waste asphalt concrete is less than 25 parts by weight, the amount of the waste asphalt concrete is too small to be recognized as regenerated asphalt concrete by definition. When the waste asphalt concrete exceeds 77.9 parts by weight, the amount of waste asphalt concrete is too much, It is difficult to meet the aggregate specified particle size of concrete and the amount of relatively oxidized asphalt is increased, making it difficult to produce recycled asphalt concrete or regenerated modified asphalt concrete having excellent physical properties.

When the composition ratio of the aggregate is less than 20 parts by weight, it is difficult to satisfy the asphalt concrete aggregate particle size stipulated in the standard specification (SPS). If the composition ratio exceeds 75 parts by weight, the amount of the waste asphalt concrete is too small, Or regenerated asphalt concrete.

In the regenerated asphalt concrete or regenerated modified asphalt concrete of the present invention, the asphalt is coated on the surface of the aggregate to serve as a binder for connecting the aggregate and the aggregate, and AP-3, AP-5, polymer modified asphalt (PMA) Asphalt, and natural asphalt may be used alone or in combination of two or more.

When the amount of the asphalt used is less than 2 parts by weight, the amount of the asphalt used is too small, and asphalt is not sufficiently coated on the aggregate or it is too thinly coated to cause problems such as aggregate dropout, cracking and portholes, It is impossible to satisfy physical properties such as porosity and density required in the asphalt concrete. As a result, the regenerated modified asphalt concrete may be recycled, resulting in problems such as poor compaction of the construction and plastic deformation after the construction.

The regenerated asphalt additive contained in the regenerated asphalt concrete or regenerated modified asphalt concrete of the present invention recovers the aged asphalt in the waste asphalt concrete to the original asphalt state and reforms the asphalt separately from the recovered asphalt, And it is possible to recycle the waste asphalt concrete for a certain part during production or construction of regenerated or regenerated asphalt concrete, so that it is possible to produce or construct the recycled asphalt concrete in comparison with existing modified asphalt concrete, And reduce the cost of modified asphalt concrete. In addition to reducing the disposal costs of waste asphalt concrete, it also reduces the use of fossil fuels and reduces emissions of carbon dioxide, SOx, and NOx. It is possible to produce products.

The recycled asphalt additive is preferably used in a composition ratio of 0.1 to 0.5 part by weight. When the recycled asphalt additive is used in an amount of less than 0.1 part by weight, it is difficult to recover aged asphalt from waste asphalt concrete as raw asphalt. It is difficult to make the asphalt asphalt with a small amount, and when the amount exceeds 0.5 part by weight, the cost of the regenerated or regenerated modified asphalt concrete remarkably increases and the economical efficiency deteriorates. Hereinafter, the present invention will be described in more detail with reference to Examples.

[Example 1]

First, granular powdery regenerated asphalt additives were prepared using the composition ratios as shown in Table 1 below, and regenerated asphalt concrete was prepared using these regenerated asphalt additives. The physical properties of the regenerated modified asphalt concrete were also measured.

First, an oil-in-fluid, a polymer modifier, a tackifier, and a viscosity adjuster are added and stirred for uniform dispersion. Thereafter, the process oil is added to the uniformly dispersed primary agitated product to be dispersed uniformly, Respectively. A granular powdery regenerated asphalt additive was prepared by carrying out a third agitation step so as to uniformly disperse the anti-peeling agent and the special compatibilizing agent in the secondary agitator in any order.

The recycled asphalt additive thus prepared was mixed with waste asphalt concrete recovered in the field and general aggregate to form aggregate of WC-2 (for surface layer), one of the aggregate formulations specified in the standard (SPS) Regenerated asphalt concrete was prepared and its properties were measured. Generally, in order to recover the aged asphalt contained in the waste asphalt concrete to the state before aging, AP-3, which is more soft, is mainly used in the regenerated asphalt concrete. However, here, the excellent aging asphalt recovery AP-5 was used to confirm the performance.

First, in order to determine the optimum mixing ratio of the process oil and the oil-in-water fluid used in the present invention, granular reclaimed asphalt additives were prepared by mixing in the composition ratios shown in Table 1 below. As the process oil, naphthene oil was used. As the oil containing material, wood powder of 40 mesh was used. 3 parts by weight of phosphoric acid ester as a peeling inhibitor, 10 parts by weight of PE Wax as viscosity adjuster, 15 parts by weight of C9 petroleum resin 20 parts by weight of an amorphous polyolefin resin (APAO) as a polymer modifier and 2 parts by weight of polyphosphoric acid as a special compatibilizer were used.

The granular recycled asphalt additive thus prepared was stored at 25 ° C. for 24 hours to confirm whether the oil was leached. After confirming whether or not the process oil was leached, the weight change of the product after storage at 105 ° C. for 3 hours And the ratio of nonvolatile matter was observed.

Process oil
(Parts by weight) Oil-filled fluid
(Parts by weight) Oil leachability Nonvolatile matter
[%] Stability
[N] Flow value
[1/10 mm] Experimental Example 1-1 10 57 X 99.8 14700 20 Experimental Example 1-2 15 52 X 99.8 13150 30 Experimental Example 1-3 20 47 X 99.9 13500 34 Experimental Examples 1-4 30 37 X 99.9 14100 39 Experimental Examples 1-5 40 27 X 99.8 13250 45 Experimental Example 1-6 45 22 O 99.8 9050 65 Experimental Example 1-7 55 12 O 99.7 8860 75

As can be seen from the results of Table 1, it is difficult to produce the regenerated asphalt concrete having a high quality because the physical properties are too hard for the test example 1-1 in which the amount of process oil is too small. In case of 1-7 The amount of the process oil is so large that the oil is sufficiently absorbed in the fluid, the surplus oil remains, so that the oil leaching phenomenon occurs, the product is kneaded by the leached oil, making it difficult to produce a granular product, Also, since it becomes too dry, it is not usable for paving work because the pavement is poor after road pavement. It can be easily predicted that the properties of the regenerated modified asphalt concrete using this composition are very low.

Regenerated modified asphalt concrete was prepared using the thus prepared granular reclaimed asphalt additive. To the mixture of 56.5 parts by weight of aggregate (WC-2), 40 parts by weight of waste asphalt concrete and 3.5 parts by weight of AP-5 asphalt, 1 to 0.25 part by weight of granular regenerated asphalt additive of Experimental Example 1-5 were mixed to prepare regenerated modified asphalt concrete, and stability and flow values were measured.

The measured stability and flow values satisfied most of the criteria of stability of 7500 N or more and flow values of 20 to 40, which are specifications of general modified asphalt concrete, respectively. However, in Experimental Example 1-1 and Experimental Examples 1-6 and 1-7 It was confirmed that the stability and the flow value were remarkably increased or decreased as compared with Experimental Examples 1-2 to 1-5 when the process oil was too little or too much leached as in the case of Comparative Examples 1 to 5. This means that the regenerated modified asphalt concrete Which means that the physical properties and quality of the product are deteriorated.

[Example 2]

Based on the results of Example 1, granular regenerated asphalt additives were prepared as shown in Table 2 of the present invention using various composition ratios while maintaining the mixing ratio of process oil and oil-in-water fluid in the range of 15 to 40: 27 to 52 , And regenerated asphalt concrete using the regenerated asphalt additive prepared in the composition ratios of Experimental Examples 2 to 5 was prepared through the composition ratios shown in Table 3.

Experimental Example 2 Experimental Example 3 Experimental Example 4 Experimental Example 5 Process oil 20 Naften
oil 20 paraffin
oil 17 Naften
oil 25 Paraffin oil Oil-filled fluid 30 Wood flour
(40 mesh) 30 Wood flour
(40 mesh) 35 chaff
(NP-3) 35 chaff
(NP-3) Anti-peeling agent 3 Phosphate ester 3 Phosphate ester 3 Phosphate ester 9 Lime lime Viscosity modifier 10 PE wax 10 PE wax 15 PE wax 5 amaid wax Tackifier 15 C9
Petroleum resin 15 C9
Petroleum resin 13 C5
Petroleum Shuji 7 C9
Petroleum resin Polymer modifier 20 APAO 20 APAO 15 TPE 16 APAO + LLDPE Special compatibilizer 2 Polyphosphoric acid 2 Polyphosphoric acid 2 Sulfuric acid derivative 3 Polyphosphoric acid + adipic acid

Material name Normal Experimental Example 2-1 Experimental Example 3-1 Experimental Example 4-1 Experimental Example 5-1 The bone material (WC-2) 56.5 56.5 56.5 56.5 56.5 Waste asphalt concrete 40 40 40 40 40 Asphalt (AP-5) 3.5 3.25 3.25 3.25 3.25 Regenerated modified asphalt additive 0 0.25
(Experimental Example 2) 0.25
(Experimental Example 3) 0.25
(Experimental Example 4) 0.25
(Experimental Example 5) Sum 100 100 100 100 100

[Example 3]

The physical properties of the regenerated asphalt additive were measured in the same manner as in Example 1, and the results are summarized in Table 4. The properties of the regenerated asphalt concrete using the regenerated asphalt additive according to each experimental example The results of physical properties are summarized in Table 5.

Test Items unit Exam conditions Experimental Example 2 Experimental Example 3 Experimental Example 4 Experimental Example 5 Oil leaching - 25 ℃, 24 hours none none none none Nonvolatile matter % 105 ° C, 3 hours 99.8 99.9 99.9 99.9 shape - Visual observation wet P / G ^{Note 1} wet P / G wet P / G wet P / G color - Visual observation Light brown Light brown Light brown Light brown

* Note 1 - P: Powder, G: Granule

Test Items unit General modified asphalt
Concrete Specification Experimental Example 2-1 Experimental Example 3-1 Experimental Example 4-1 Experimental Example 5-1 Beam temperature ℃ 160-180 160 160 170 170 Compaction temperature ℃ 140-160 140 140 140 140 Stability N 7500 or more 13200 14100 13500 13900 Flow value 1 / 10mm 20 to 40 36 37 35 38 Porosity % 3 to 6 4.5 4.7 5.0 4.8 Saturation % 65 to 80 73 75 76 75

[Example 4]

In order to optimize the amount of the process oil and the oil-in-oil fluid used in the present invention, the oil leaching experiment was performed while changing the ratio of the oil to the oil-containing fluid as follows using the same experimental conditions as those in the first embodiment.

Whether process oil is leached Process oil (parts by weight) Oil-filled fluid
(Parts by weight) 10 15 20 30 40 45 55 12 X O O O O O O 25 X X O O O O O 27 X X X X X X O 37 X X X X X X X 47 X X X X X X X 52 X X X X X X X 57 X X X X X X X

(X: non-leaching, O: leaching)

As can be seen in Table 6, it can be seen that as the amount of the oil-in-oil fluid used decreases and as the content of the process oil increases, the oil leaching phenomenon (O marked portion) occurs.

It is preferable to use at least 37 parts by weight of the oil compartment fluid or at least 27 parts by weight of the oil compartment fluid and not more than 45 parts by weight of the process oil, It is necessary to make the regenerated modified asphalt concrete by using the regenerated modified asphalt admixture in consideration of the measurement results of the physical properties (flow value and porosity).

Thus, as shown in Table 7 below, recycled asphalt concrete was prepared using granular powdery regenerated asphalt additive having a composition ratio of some of the composition ratios identified in Table 6, and the physical properties thereof are shown in Table 7 below.

Flow value / porosity (%) Process oil (parts by weight) 10 15 20 30 40 45 Oily fluid (parts by weight) 57 20 / 6.6 28 / 6.4 36 / 6.2 41 / 6.1 49 / 5.8 52 / 5.5 52 21 / 6.2 30 / 5.2 34 / 4.2 37 / 3.7 39 / 3.3 46 / 3.0 25 - 17 / 7.1 - - - -

As shown in Table 7, 25 parts by weight of the oil-in-water fluid composition was very low and 52 and 57 parts by weight of the composition having a high boiling fluid were fixed, respectively. Thereafter, the amount of process oil was changed from 10 parts by weight to 45 parts by weight (This composition ratio corresponds to the composition in which the oil is not leached according to the results of the oil leaching test in Table 6 above), and the results are shown in Table 3 of Example 2, The regenerated modified asphalt concrete was prepared with the same composition as in Example 2-1, and the flow rate and porosity (%) were measured.

As can be seen from the measurement results of the flow value and porosity, it can be seen that when the content of the oil compartment fluid is increased to 57 parts by weight, the porosity or the flow value does not satisfy the general modified asphalt concrete specification, It is interpreted that it is difficult to obtain the excellent physical properties of regenerated modified asphalt concrete because the amount of other components is too small.

On the contrary, in the case where the oil content is 25 parts by weight and the process oil is 15 parts by weight, although the oil leaching test did not cause oil leaching, the flow rate and porosity do not meet the specifications of the general modified asphalt concrete Respectively.

Particularly, when the content of the oil-containing material is 52 parts by weight, when the content of the process oil is as low as 10 parts by weight, the porosity is too high as 6.2% and when the content of the process oil is too high as 45 parts by weight, This is because the oil content should be included in an amount of at least 27 parts by weight or more, so that the leaching of the oil does not occur, but should be included in the range of not more than 52 parts by weight (at the same time, the process oil is in the range of 15 to 40 parts by weight) It is experimentally confirmed that when the asphalt concrete is manufactured, the physical properties within the appropriate standard range can be secured.

As can be seen from the results of these various examples, the regenerated asphalt additive of the present invention is easy to use and store as granular powder type product while containing a large amount of oil and resin, and has excellent production efficiency of regenerated asphalt concrete Able to know. Particularly, by using the recycled asphalt additive without heating and melting separately, it is possible to produce recycled asphalt concrete or regenerated modified asphalt concrete having more economical performance.

In addition, due to the viscosity modifier contained in the regenerated asphalt additive of the present invention, the production of the regenerated modified asphalt concrete and lowering of the construction temperature (non-beam temperature and compaction temperature) can be lowered by 10 to 20 ° C, thereby improving productivity, have.

That is, it is possible to maximize the amount of waste asphalt concrete to the extent that the specified aggregate mixed particle size is satisfied, thereby making it possible to produce regenerated, regenerated modified asphalt concrete which is more environmentally friendly and economical, and the existing general and modified asphalt concrete It is confirmed that the physical properties of the regenerated, regenerated modified asphalt concrete of the present invention are excellent.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be appreciated that modifications can be made.

Claims (8)

Wherein the viscosity modifier is used in an amount of 15 to 40 parts by weight, the oil-impregnated fluid is 27 to 52 parts by weight, the tackifier is 3 to 20 parts by weight, the polymer modifier is 5 to 30 parts by weight, 1 to 10 parts by weight of special commercialization,
The oil-in-fluid is any one of wood powder, rice hull powder or a mixture thereof, having a particle diameter of 1.5 mm or less, a particle size of 30 to 100 mesh,
Wherein the process oil is a naphthenic or aromatic oil. delete The tackifier according to claim 1,
Rosin, C5 or C9 petroleum resin, rosin ester, hydrogenated resin, or a resin in which at least two or more of them are mixed. delete The anti-peeling agent according to claim 1,
Wherein the composition is any one of calcium carbonate, calcium carbonate, calcium carbonate, calcium carbonate, calcium carbonate, calcium carbonate, calcium carbonate, calcium carbonate, calcium carbonate, calcium carbonate, calcium carbonate and calcium carbonate. The special compatibilizer according to claim 1,
Polyphosphoric acid, sulfuric acid derivative, adipic acid, oleic acid, phosphorus pentoxide, iron chloride, or a mixture of at least two or more of these. A method for producing a powdery or particulate regenerated asphalt additive,
27 to 52 parts by weight of an oil-impregnated fluid, 5 to 30 parts by weight of a polymer modifier, 3 to 20 parts by weight of a tackifier and 4 to 20 parts by weight of a viscosity adjuster are uniformly dispersed in a ribbon mixer.
A second agitation step of adding 15 to 40 parts by weight of process oil to the primary agitated product uniformly dispersed in the primary agitating step to uniformly disperse the same; And
A second agitation step of uniformly dispersing 2 to 10 parts by weight of an anti-peeling agent and 1 to 10 parts by weight of a special compatibilizer in a secondarily agitated product uniformly dispersed in the second agitation step,
The oil-in-fluid is any one of wood powder, rice hull powder or a mixture thereof, having a particle diameter of 1.5 mm or less, a particle size of 30 to 100 mesh,
Wherein the process oil is a naphthenic system or an aromatic system oil. 8. The method of claim 7,
Wherein the stirring speed and time are controlled so that the temperature of the stirring tank is maintained at 60 占 폚 or less in the primary stirring step to the tertiary stirring step.