KR101681961B1 - Development of Material and Application for urgent pavement maintenance using Reclaimed Asphalt Aggregate and Quick setting reactive emulsified asphalt binder - Google Patents

Abstract

The present invention relates to a recycled aggregate mixture using a spherical reactive refinement emulsion binder and a pavement emergency maintenance method using the same. The object of the present invention is to provide a recycled aggregate mixture using a recycled aggregate and a spherical reactive refinement emulsion binder, wherein the aging of the pavement is severe, The present invention provides a pavement maintenance method using a recycled aggregate and a low speed reactive modified emulsion binder capable of quickly ensuring the durability of a pavement.
The present invention relates to a recycled aggregate mixture containing a reduced-diameter reactive modified emulsion binder and a pavement emergency maintenance method using the same.
The above-mentioned reduced-diameter reactive recycled aggregate mixture comprises 3 to 13 parts by weight of a low-molecular-weight reactive modified emulsion binder, 1 to 5 parts by weight of a reaction product, and 1 to 7 parts by weight of water, based on 100 parts by weight of the recycled aggregate, A cutting step of cutting the part; A base treatment step of cleaning and tack coating the cut surface; The pavement road is urgently maintained by the step of forming a recycled aggregate mixture layer for laying the recycled aggregate mixture on the surface treated.

Description

TECHNICAL FIELD [0001] The present invention relates to a recycled aggregate mixture and a pavement road emergency maintenance method using the same, and a reactive emulsified asphalt binder using the reclaimed asphalt aggregate.

The present invention relates to a recycled aggregate mixture using a low speed reactive modified emulsion binder and a pavement emergency maintenance method using the same, and more particularly, to a method of quickly repairing a pavement by a recycled aggregate mixture comprising a recycled aggregate and a low- The present invention relates to a recycled aggregate mixture using a small-diameter reactive refinement emulsion binder capable of ensuring the durability of a pavement, and a pavement emergency maintenance method using the same.

Asphalt pavement is damaged due to continuous vehicle passing after construction, deterioration of asphalt with time, increase of precipitation due to climate and environmental changes, and even in the case of urban areas, large vehicles and overload vehicles Traffic volume is increasing, and damage to the pavement is also occurring frequently.

Such pavement damage areas must be repaired in a timely manner so that the pavement layer can be maintained constantly. Otherwise, the damaged areas are gradually enlarged and large-scale repair is required, resulting in economic loss and traffic accidents.

Asphalt pavement roads vary in their lifespan depending on how they are maintained. Therefore, it is very important to select an appropriate maintenance period and repair method for pavement roads.

Asphalt repair materials usually consist of binders, auxiliary binders, solvents, aggregates, and other additives. Such an asphalt repair material should have excellent physical properties in terms of fluidity, compaction property, cohesion between materials, reactivity, crosslinking property, storage stability, etc. However, since these properties are closely related to each other, As a result, studies on an asphalt repair material capable of providing a convenient workability and a rapid strength development have been actively conducted.

Currently, aggregates used in the production of asphalt repair materials and concrete account for most of the natural aggregates produced by crushing natural rocks. Recently, however, large apartment houses have been constructed to improve the residential environment and improve the residential environment, Road expansion and pavement work have been carried out. As a result, a large amount of aggregate is required and aggregate shortage has been worsened, and the amount of circulating aggregate or waste concrete generated during road repair has been increasing.

In particular, recycled aggregate from road pavement improvement and repair work is a major construction waste issue, and only about 11% of the recycled aggregate generated during road construction is recycled and the entire waste is disposed of. In order to solve these environmental problems, researches on the utilization of recycled aggregate have been widely developed. In addition, studies on the utilization of recycled aggregate have been carried out in the maintenance of pavement roads in earnest have.

A study on the utilization of such recycled aggregates has revealed that the recycled aggregate, new aggregate, cement, and ethylene vinyl acetate modified emulsified asphalt derived from waste asbestos, including the asphalt, can be paved at room temperature without any additional heating process. There is a patent (10-1360886) concerning the mixture, but it is about the waste asbestos mixture mainly used for the base layer, and it takes a long time for curing and it is difficult to secure certain durability, so it is not applied to actual road pavement .

In addition, a patent (10-1360886) in which a waste asphalt, a new aggregate, a cement and an acrylic emulsion having a glass transition temperature of -30 캜 or lower and a modified emulsion asphalt modified with a resin emulsion having a softening point of 70 캜 or higher, However, this includes an aggregate mixture adjusted to the granularity specified in the GR F 4026 room temperature regenerated asphalt concrete mixture, and a slow curing type quaternary amine series surfactant having excellent mixing property with aggregate and delayed emulsion breakdown However, since the reaction time and curing time of the fast curing type emulsion were long, there were many limitations to be applied to the actual site.

In addition, Korean Patent No. 10-136479 discloses that since the aggregate is not heated according to the recycled asphalt mixture at room temperature, the remedial asphalt recycling effect can be obtained and the quality, performance and temperature control difficulty due to deterioration of heat oxidation of asphalt Improvement of the problem makes it easy to manufacture and control the quality, extend the life of the packaging, improve the quality of recycled packaging, and store the product at room temperature, so there is no need to dispose of surplus product at the time of manufacturing. It is possible to construct eco-friendly roads by suppressing the generation of atmospheric pollutants such as dust, carbon dioxide, nitrogen, and sulfuric acid compounds due to the heating of aggregate, but in order to reduce plastic deformation and crack destruction in actual recycled asphalt mixture, Asphalt concrete table with recycled additives acting as stiffness Due to such difference in thermal expansion coefficients of the packaging and for application to the critical point and the surface layer, such as a crack, etc., the adhesive surface had occurred separation is difficult.

In addition, in the pavement maintenance method using reclaimed aggregate and modified emulsified asphalt of Korean Patent No. 10-0942383, it is difficult to ensure sufficient durability to use the recycled aggregate mixture itself as a surface layer. Thus, after the recycled aggregate mixture is installed, And a slag mixed aggregate having a particle size of about 0 to 8 mm are mixed and put into a thin layer on the surface of the liquid mixture layer.

Patent Registration No. 10-1440937 (2014.09.05) Patent Registration No. 10-1154860 (June 4, 2012)

The object of the present invention is to provide a method for improving the durability of pavement by using recycled aggregate and a slow-reactive refinement emulsion binder, Aggregate mixture and pavement road emergency maintenance method using the same.

The present invention relates to a recycled aggregate mixture containing a reduced-diameter reactive modified emulsion binder and a pavement emergency maintenance method using the same.

The above-mentioned reduced-diameter reactive recycled aggregate mixture comprises 3 to 13 parts by weight of a low-molecular-weight reactive modified emulsion binder, 1 to 5 parts by weight of a reaction product, and 1 to 7 parts by weight of water, based on 100 parts by weight of the recycled aggregate, A cutting step of cutting the part; A base treatment step of cleaning and tack coating the cut surface; The pavement road is urgently maintained by the step of forming a recycled aggregate mixture layer for laying the recycled aggregate mixture on the surface treated.

In the present invention, after the package with a severe aging of the packaging is cut, the recycled aggregate and the low-molecular-weight reactive modified emulsion are mixed, and the mixture is laid and compacted at room temperature to form a quick-hard recycled aggregate mixed layer. It is possible to open traffic early.

In other words, the present invention is an eco-friendly method that enables quick opening of traffic after construction by utilizing a slow-rebound asphaltene asphalt and recycled aggregate. Conventional recycling aggregate-based pavement methods have a curing time of about 48 hours, It is possible to apply it to the surface layer beyond the limit of application, and it is possible to shorten the work time by reducing the traffic opening time to one hour or less, and to minimize the traffic interruption time and construction cost.

The present invention recycles recycled aggregate directly from the site to improve the work efficiency of the work team at a small emergency repair site requiring quick repair, secures the safety of the work team and the safety of the worker by shortening the traffic cut and quick work .

In the present invention, after the vegetable lubricant is dissolved in asphalt, curing and crosslinking are formed by reaction with strong alkaline components such as sodium hydroxide, potassium hydroxide and the like, which are components in the reactant and the recycled aggregate, The softening point and the reduction point of the asphalt binder are increased to improve the performance of the asphalt binder.

By recycling the recycled aggregate, the present invention can reduce the generation of waste materials, reduce the cost of waste disposal and the like, and minimize the emission of harmful elements such as carbon dioxide.

The present invention utilizes on-site recycled aggregate in place of a heated asphalt concrete mixture, which is difficult to supply in small quantities in a small scale emergency repair site, and provides smooth material securing and excellent economical efficiency.

In the present invention, the recycled aggregate mixture containing the recycled aggregate and the slow-modifying reactive emulsion binder is applied at 1 to 8 cm, and the slow-reactive modified emulsified asphalt can solve problems such as durability and curing of the mixture.

In addition, the present invention is suitable for repairing road sofas and repairing cold joints, and is suitable for small-scale maintenance due to easy acquisition and construction of materials. In addition to being capable of small scale manpower construction, It is effective.

In addition, the recycled aggregate mixture of the present invention has excellent durability, moisture resistance, and room temperature construction, and is applicable to road maintenance for emergency maintenance.

Further, the present invention is intended to contain a vegetable lubricant, and has many advantages such as improved stability in summer temperature, resistance to abrasion, water resistance, durability, and excellent strength to control curing time and early traffic opening.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a block diagram of a construction method according to the present invention;
FIG. 2 shows an example of a layer structure according to the present invention

The slow-axis reacting recycled aggregate mixture according to the present invention comprises 3 to 13 parts by weight of a low-molecular-weight reactive modified tanning agent binder, 1 to 5 parts by weight of a reaction product, and 1 to 7 parts by weight of water, based on 100 parts by weight of the recycled aggregate.

The recycled aggregate mixture may further contain 0.5 to 40 parts by weight of a new crushed aggregate based on 100 parts by weight of the recycled aggregate.

The recycled aggregate has an asphalt content of 4.9 wt% on average, and the recycled aggregate used in accordance with the quality standard of asphalt concrete recycled aggregate shown in [Table 1] below is used. By using such recycled aggregate, the amount of used emulsion is reduced by about 15 to 25% compared with the mixture of recycled construction waste and new aggregate.

[Table 1]

The oil-based reactive refill emulsion binder according to claim 1, wherein the binder resin comprises 50 to 70 wt% of asphalt, 0.1 to 5.0 wt% of emulsifier, 0.1 to 5.0 wt% of acid, 0.1 to 3.0 wt% of vegetable lubricant, 3 to 10 wt% of special polymer, 0.1 to 3 wt% 0.1 to 1.0 wt% of an additive for controlling the curing time and 23 to 45.5 wt% of water.

The above-mentioned thermosetting modified emulsion binder may further contain 1 to 5 wt% of a polymer and a latex additive.

The asphalt is based on PG 64-22 grade straight asphalt which is produced domestically.

The emulsifying agent is a cationic compound of CRS, CMR, CSS-1h and CQS-1h, and the acid means an acid such as hydrochloric acid or phosphoric acid. The amount of the acid and the emulsifier is about 0.1 to 4.0 wt% .

The vegetable lubricant is dissolved in the asphalt binder in advance with special polymer plastics. Rapeseed oil or linseed oil is used.

In addition, the vegetable lubricant may be a fatty acid (Fatty Acid) which exhibits a performance equivalent to or higher than rapeseed oil or linseed oil.

Such vegetable lubricants are present in the form of oil-in-water in the form of a spherical reactive refinement emulsion binder. The vegetable lubricant is a strong alkaline component such as sodium hydroxide, potassium hydroxide, etc., or a strong alkaline component in the recycled aggregate, By reacting with the strong alkaline components in the reaction agent, curing and crosslinking are formed as shown in the following reaction formula, thereby improving the performance of the asphalt binder by raising the softening point and the reduction point of the asphalt binder.

[Reaction Scheme]

The physicochemical and chemical properties of rapeseed oil (rapeseed oil) and amish oil (linseed oil), which are vegetable lubricants used in the present invention, are shown in Table 2 below.

[Table 2]

The special polymer plastic is a thermoplastic resin, a thermoplastic elastomer and an acrylic acid. It adjusts fluidity at high temperature and improves adhesiveness, low temperature enhancement and stretchability, and strengthens the strength. In addition, when it is mixed with recycled aggregate, Lt; / RTI >

The special polymer plastics may be used alone or in combination of two or more of polystyrene, polybutadiene, polyetylene, ethylene-butene copolymer and ethylene-octene copolymer. Or a mixture of three or more selected from the group consisting of styrene butadiene block copolymer and styrene isoprene block copolymer, or a mixture thereof.

Such a special polymer plastic is stable at heat (high temperature) and has a property of increasing the adhesion to the lower surface (asphalt road surface).

BioStab, a vegetable additive extracted from soybean, stabilizes emulsified asphaltene (asphalt particles) and special polymer plastics to prolong shelf life, prevent quality deterioration, and improve the quality of vegetable monooleate ) System biostat (vegetable emulsifier) is used.

The curing time controlling additive is added to the emulsified water part to soften and regenerate the regenerated asphalt for the recycled aggregate when the binder resin of the present invention is blended with the recycled aggregate to increase the coating property In addition, it plays a role of stabilizing the breaking time at the time of compounding, and amine type or polyamine type of 1 to 4 class is used according to the use condition.

The polymer and the latex additive are added in an amount of 1 to 5 wt% to improve mechanical properties such as aging resistance, heat resistance, abrasion resistance and ozone resistance of the asphalt.

As a result of the addition of the special polymer plastic and the vegetable lubricant, the binder resin having excellent durability, weatherability and bonding strength with the aggregate is excellent and the curing time due to the reaction is short, This increases the ductility and durability of the packaging material and makes it suitable for use in emergency maintenance.

The reactive agent improves the performance of the modified emulsion binder by reacting with the vegetable lubricant and is added with one selected from the group consisting of sodium hydroxide, potassium hydroxide, calcium carbonate, quicklime, and the like, The vegetable flux oil reacts with the additive to generate oxidation, which hardens and increases the softening point, thereby improving the physical properties of the asphalt.

Hereinafter, the pavement emergency maintenance method using the recycled aggregate mixture containing the low speed reactive recycled aggregate mixture of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a block diagram showing a construction method according to the present invention, FIG. 2 is a view illustrating an example of a layer structure according to the present invention, and FIG. A base treatment step of cleaning and tack coating the cut surface; And forming a recycled aggregate mixture layer on the surface treated surface,

The above-mentioned reduced-diameter reactive recycled aggregate mixture comprises 3 to 13 parts by weight of a low-molecular-weight reactive modified emulsion binder, 1 to 5 parts by weight of a reaction product, and 1 to 7 parts by weight of water, based on 100 parts by weight of the recycled aggregate.

In the cutting step, the damaged part is cut off at a portion where damage is severely caused or the surface is required to be loosened, and the ground processing step is performed by removing soil, dust, foreign matter, etc. using high- Spray the coating.

The step of forming the recycled aggregate mixture layer is a step of forming a recycled aggregate mixed surface layer by utilizing recycled aggregate material as a construction waste. The water, the recycled aggregate material and the reactant are charged into a small diameter reactive modified emulsion binder in situ, A recycled aggregate mixture coated with a reduced-diameter reactive-modified emulsion binder is formed, and the resulting recycled aggregate mixture is laid and compacted on a surface treated to form a mixture layer.

Such a recycled aggregate mixture may include a charging step of charging a reduced-diameter reactive modified emulsion binder into a stirrer; A stirring step of adding water to the stirrer and stirring the mixture; The recycled aggregate material having a particle size of 0 to 19 mm or less, the recycled aggregate material having a particle size of 2 to 5 mm or the recycled aggregate material having a particle size of 5 to 10 mm is mixed into the stirrer and a reactant is added thereto to form a liquid recycled aggregate mixture Generating step.

As described above, the above-mentioned thermosetting modified refinement emulsion binder is characterized in that it comprises 50 to 70 wt% of asphalt, 0.1 to 5.0 wt% of emulsifier, 0.1 to 5.0 wt% of acid, 0.1 to 3.0 wt% of vegetable lubricant, 3 to 10 wt% 0.1 to 3 wt% of a storage stability improver, 0.1 to 1.0 wt% of an additive for controlling a curing time, and 23 to 45.5 wt% of water.

The present invention provides a method for producing a water-in-oil type emulsion binder, comprising the steps of: mixing an emulsifier, an acid, water, a storage enhancer and an additive for controlling a curing time into a stirrer to produce mixed emulsified water; It is produced by supplying and emulsifying special polymer plastic and vegetable lubricant with dissolved asphalt.

That is, the above-mentioned thermosetting modified emulsion binder includes a mixed emulsified water generating step of adding mixed emulsified water by adding / stirring an emulsifier, an acid, water, a storage property improving agent and an additive for controlling a curing time to a stirrer, And an emulsifying step of mixing and emulsifying the asphalt in which the vegetable lubricant is dissolved in a mixing tank.

At this time, steam of about 130 to 180 DEG C is supplied to the mixed tank and mixed emulsified water and the modified asphalt mixture, and the resulting modified emulsion binder is stored in the storage tank at a constant temperature of 110 to 160 DEG C.

In the mixed emulsified water generating step, an emulsifier and an acid such as hydrochloric acid or phosphoric acid are added to a tank for preparing emulsified water, and the mixture is adjusted to have a pH of 1 to 4 by adding water, and then maintained at a constant temperature of 40 to 70 And the remaining water (remaining amount except water added for pH adjustment) is added to the mixture, and mixed with the mixture at 20 to 30 RPM for 1 to 2 hours by a high-speed stirrer to produce mixed emulsified water.

In the emulsifying step, the special polymer plastic, the asphalt mixed with the vegetable lubricant and the mixed emulsified water are supplied into a colloid mill by respective pumps and emulsified by a mechanical method to produce a modified emulsion binder.

The special polymer plastics and vegetable lubricants are prepared by adding a special polymer plastic and a vegetable lubricant in a state where the PG 64-22 grade straight asphalt produced in Korea is heated to 150 to 180 ° C and then mixed with a high shear mixer or a high viscosity mixer By mixing about 30 to 60 minutes, the additive is homogeneously dissolved in the asphalt.

Hereinafter, the present invention will be described in detail with reference to Examples.

Example 1

3 wt% of a special polymer plastic (ethylene-butene copolymer) and 2 wt% of a vegetable lubricant were dissolved in 60 wt% of asphalt and maintained at 150 DEG C in a storage tank. 0.5 wt% of a cationic emulsifier was added to a tank for emulsifying water, And 0.5% by weight of hydrochloric acid. The mixture was adjusted to pH 1 to 4 by adding water. The mixture was kept at 60 캜, and 2 wt% of Biostab, 0.5 wt% of amine-based curing time adjusting additive, Mixed with water at 30 RPM for 2 hours by an agitator to produce mixed emulsified water,

Asphalt and mixed emulsion water in the storage tank were supplied into a colloid mill by a pump and emulsified by a mechanical method. The viscosity and elongation of the emulsion were measured, and the viscosity and elongation of the emulsion were measured by cationic emulsified asphalt quality standard (ASTM D 2397). The results are shown in [Table 3].

At this time, a total of 100 wt% of the modified emulsion binder was added to the water, and some of them were added for pH adjustment in the preparation of mixed emulsified water and the rest were added together with the storage enhancer and the curing time controlling additive.

[Table 3]

In Table 3, it can be seen that the durability of the modified emulsion binder according to the present invention is superior to that of general asphalt by the addition of the special polymer plastic and the addition of the vegetable lubricant, and the penetration is improved.

Since the modified emulsion binder of the present invention can be applied at room temperature and has a low viscosity, it can be easily penetrated into the cracked portion, so that microcracks can be sealed. Also, since the special polymer plastic added after curing is excellent in adhesion and ductility, It is possible to facilitate the maintenance work of continuous longitudinal cracks and cracks, particularly cracks in roads.

Example 2

Using the modified emulsion binder according to Example 1, the indirect tensile strength and the Marshall stability of the specimens were measured as shown in the following Table 4. The results are shown in Table 4. At this time, a small amount (about 1 part by weight) of water was added for workability in mixing.

[Table 4]

As shown in the above Table 4, the stability of the recycled aggregate mixture according to the present invention was increased by about 7 to 13 times as compared with that of the ordinary temperature asphalt standard, which is the stability at 2500N, as a result of the mortar stability, the immersion residue stability and the indirect long- These characteristics indicate that the recycled aggregate mixture of the present invention constitutes a very stable mixture in the open state of traffic.

Also, in the case of the immersion residual stability, it can be seen that the present invention maintains a stable state even in a soaking state in view of a tendency of a value exceeding 75%.

In addition, the results of such indirect tensile strength tests are useful in predicting the likelihood of cracking, and a mixture that can withstand a high tensile strain prior to fracture is more resistant to cracking than a non-fractured mixture.

In addition, the modified emulsion mixture containing recycled aggregate aggregates has an indirect tensile strength ratio of more than 0.7, which is superior to the ordinary temperature asphalt mixture in crack resistance and durability.

Example 3

[Table 5] shows the comparison between the repair method of the road sofa and the existing method by the recycled aggregate mixture mixed at the magnification according to the embodiment 2.

[Table 5]

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents. Of course, such modifications are within the scope of the claims.

(10): Asphalt layer
(20): Recycled aggregate mixed layer

Claims (7)

For reclaimed aggregate mixtures for pavement emergency maintenance;
The recycled aggregate mixture is prepared by adding 3 to 13 parts by weight of a low-molecular-weight reactive modified emulsion binder to a stirrer, adding 1 to 7 parts by weight of water to the mixture, stirring the aggregate, Or a recycled aggregate mixture of 5 to 10 mm in length, and then adding 1 to 5 parts by weight of a selected one of sodium hydroxide, potassium hydroxide, calcium carbonate and quicklime as a reactant,
The above-mentioned reduced-diameter reactive-
The emulsifier, acid, water, storability improver and curing time control additive are added to the agitator to produce mixed emulsified water, and then mixed with a special polymer plastic, rapeseed oil or linseed oil-dissolved straight asphalt Is mixed and emulsified in the mixed emulsion water,
Straight asphalt in which the special polymer plastics, rapeseed oil or linseed oil is dissolved can be obtained by mixing the special polymer plastic with the straight asphalt heated to 150 to 180 ° C and the Rapeseed oil or linseed oil having physicochemical properties is added and mixed for 30 to 60 minutes.
The composition of claim 1, wherein the asphalt composition comprises 50 to 70 wt% of straight asphalt, 0.1 to 5.0 wt% of emulsifier, 0.1 to 5.0 wt% of acid, 0.1 to 3.0 wt% of rapeseed oil or linseed oil, Wherein the binder is 0.1 to 3 wt% of a storage stability improver, 0.1 to 1.0 wt% of an additive for controlling a curing time, and the balance of water is 100 wt%.
[Table 2]

delete delete delete The method of claim 1,
The curing time controlling additive may be a primary to quaternary amine type or polyamine type,
Wherein the storage stability improver is a Sorbian Monooleate-based BioStab. 2. The recycled aggregate mixture according to claim 1, wherein the storage modifier is a Sorbian Monooleate-based BioStab.
delete In pavement emergency maintenance method;
A cutting step of cutting a damaged portion of the package or the gypsum package;
A base treatment step of cleaning and tack coating the cut surface;
And a step of forming a recycled aggregate mixture layer by laying and compaction of the recycled aggregate mixture according to claim 1 or 5 on the surface subjected to the base treatment to obtain a pavement using the recycled aggregate mixture containing the slow- Emergency maintenance method.

Images