KR100879049B1 - Coloured asphalt concrete using clean asphalt and the manufacturing method thereof - Google Patents

Abstract

A method for manufacturing color asphalt concrete using colorless asphalt is provided to reduce generation of cold-crack by relieving appropriately rigidity at winter time and to generate no miniature deformation at summer time. A method for manufacturing color asphalt concrete using colorless asphalt comprises steps of: heating urethane chip of which a foaming rate is 30% or more and a size is 2mm or less at 60-120°C using an indirect heating method and gelling a surface; injecting and mixing urethane or the colorless asphalt binder 0.01-0.03 parts by weight, one or their mixture of cement and calcium carbonates of 0.01-0.03 parts by weight into 1 part by weight of gelled urethane chip in the surface; cooling and cutting the mixture and manufacturing urethane coating chip; and mixing the urethane coating chip with colorless asphalt and aggregate, filler, pigment such as colorless asphalt and the aggregate.

Description

Colored Asphalt Concrete Using Clean Asphalt and the Manufacturing Method Thereof}

The present invention relates to color asphalt concrete using colorless asphalt and a method for paving the same, and more particularly, to a color asphalt concrete and a method for paving the colorless asphalt using urethane coating chips.

In recent years, it is required that roads and construction facilities be designed to be in harmony with visual beauty and the surrounding environment due to the improvement of living standards, and not simply to perform its functions. It is required to build roads colored with various colors, not asphalt black or dark red asphalt pavement. In addition to improving the aesthetic appearance, the color pavement can be used to enhance safety for drivers and pedestrians by coloring the bar with special features such as bus lanes, pedestrian crossings and crosswalks in front of the school. For this reason, the need for color asphalt pavement is rapidly increasing.

Colorless asphalt should be used for paving colored asphalt. Colorless asphalt is a petrochemical resin, which has a problem of low temperature cracking due to its rigidity in winter, and softening in summer. In addition, there is a problem that cracks caused by solar heat also occur.

In order to solve the low temperature crack in winter, a method of containing more process oil (mainly malten oil) has been suggested.However, containing a lot of process oil causes the asphalt to become too soft. There is a problem that deformation easily occurs.

Modifiers such as SBS or SIS can also be used to compensate for the drawbacks of colorless asphalt. These asphalt modifiers require high temperature heaters and high shear mixers. Since the separation of the reforming material occurs, there is a problem that each must be stored in a separate tank.

For the same reason as above, defects frequently occur in the colored asphalt paved using colorless asphalt, and there is no fundamental countermeasure yet.

The present invention is proposed to solve the above problems of the prior art, an object of the present invention, by appropriately mitigating the rigidity which is an inherent problem of colorless asphalt to reduce the occurrence of low-temperature cracks in winter, small deformation in summer By preventing the occurrence, color asphalt pavement using colorless asphalt can be widely applied in various forms.

The present invention is heated to 60-120 ° C by indirect heating method (heating by direct heat not to contact the chip by applying heat from the outside of the chip mixing mixer) to the Urentan chip having a foaming rate of 30% or more. The surface is gelled, and 0.01-0.03 parts by weight of urethane or colorless asphalt binder, 0.01-0.03 parts by weight of cement or calcium carbonate, or a mixture thereof are added to 1 part by weight of the urethane chip in the surface gelation step, and the mixture is sufficiently mixed. The mixture is then cooled to room temperature and cut into chips (hereinafter referred to as "urethane coated chips") to produce chips (the urethane coated chips can be stored in vinyl bags for long-term storage). Method for producing colored asphalt concrete by mixing with colorless asphalt and conventional asphalt concrete materials and asphalt cones produced by such method It relates to discrete. In the present invention, the foaming rate is a percentage of the volume increase after foaming to the volume before foaming.

The reason for using the foamed urethane chip in the present invention is that in general, urethane is a thermosetting resin, which does not dissolve well in heat, whereas surface coating is difficult, whereas foamed urethane has an air layer formed therein, and thus surface gelation is performed even at a relatively low temperature (about 60). This is because it is easily done and thus the surface coating is easy. In other words, the foamed urethane has many voids, so that the adhesive force to the urethane chips of the colorless asphalt in contact with the surface is increased, but they are not bonded in an unified state. By heating the surface into a sticky gel state, the colorless asphalt caught on the surface of the gelled urethane chip can be firmly coated on the surface of the urethane chip to achieve integration.

In the present invention, the degree of foaming of the urethane chip should be 30% or more, and if it is 30% or less, there is a problem in gelation. Indirect heating of the foamed urethane chip starts to gel at about 60 ° C and starts melting at about 120 ° C. Therefore, the temperature range of indirect heating should be 60-120 ° C.

Instead of urethane chips, the use of crushed waste tire chips or EPDM chips may be considered.However, crushed waste tire chips have a turbid color when mixed with colorless asphalt, and are not suitable for color asphalt concrete pavement, and EPDM chips are easy to foam. It is difficult to gel the surface because it is not, there is a problem in the surface coating. Therefore, they are difficult to be used for color asphalt concrete pavement using colorless asphalt.

When the urethane coated chip prepared as described above is mixed with colorless asphalt heated to 150-200 ° C., the urethane coated chip is easily adhered to colorless asphalt by urethane or colorless asphalt binder coated on the surface thereof. Evenly distributed on colorless asphalt and aggregates, resulting in elasticity throughout the colored asphalt concrete. And because of this, the pavement using the color asphalt concrete of the present invention has the effect of reducing the occurrence of low-temperature cracks in winter, and prevents deformation in summer.

Hereinafter, the method of this invention is demonstrated.

First step: manufacturing an elastic chip of the present invention.

In this step, the urethane chips having a foaming rate of 30% or more are heated at 60-120 ° C. by indirect heating method to gel the urethane chip surface, and urethane or colorless asphalt is used for 1 part by weight of the urethane chip in the surface gelation step. 0.01-0.03 parts by weight of binder, one or a mixture of cement and calcium carbonate, or 0.01-0.03 parts by weight of the mixture is sufficiently mixed, and then the mixture is cooled to room temperature and cut into a predetermined size to produce a urethane coating chip. Step.

In this step, the reason for limiting the size of the urethane chip to 2 mm or less is that 2 mm or less is easy to disperse when mixing with colorless asphalt in the future, thereby solidifying the bond with colorless asphalt, This is because the effect of improving the quality of the colorless asphalt is large. And preferably, it should be 1.5 mm or less. The reason for the indirect heating of these chips to 60-120 ° C is that, first, there is a problem that these chips are burned unless it is indirect heating. Second, when the temperature is below 60 ° C, the surface of these chips does not gel (maturate) in the future. This is because sufficient binding is not achieved at the time of coupling with the third, and when the temperature is 120 ° C. or higher, the chips melt and the particles stick together, making it difficult to form individual particles, and the urethane chip may be fired. The color of the urethane chip is preferably used the same or similar to the color of the package.

On the other hand, the reason for using a urethane or a colorless asphalt binder is that these binders have excellent adhesion to urethane chips at high temperatures. If these binders are 0.01 parts by weight or less, the coating liquid may be insufficient. If the binder is 0.03 parts by weight or more, the coating liquid may be excessive, resulting in bonding between the urethane chip particles.

And the reason for using one of the cement, calcium carbonate or a mixture thereof is to prevent the tangling of the modifier urethane chips. When the cement, calcium carbonate or a mixture thereof is 0.01 parts by weight or less, the amount of coating on the surface of the urethane chip is too small, and when 0.03 parts by weight or more, the amount of coating is unnecessarily large and dust may be generated. to be.

Second step: preparing colored asphalt.

This step is to prepare the color asphalt concrete by mixing the urethane coating chip prepared in the previous step with the asphalt concrete material. Specifically, to produce 1 ton of colored asphalt concrete, 6-18 kg of urethane coated chips may be mixed with other materials. At this time, if the urethane coating chip is used at 6kg or less, the desired use effect cannot be obtained, and if it is 18kg or more, it does not help to improve the quality. Therefore 6-18 kg is appropriate.

Other materials to be mixed together include colorless asphalt, aggregates, fillers (stone powder, limestone, cement, etc.), pigments, and the like, and reinforcement fibers may also be used if necessary. At this time, the aggregate and the other materials, the usage amount and the like may be determined according to a conventional method. Of course, the amount of these materials, etc. can be determined according to the nature of the road to be paved and the purpose, depending on the use of the specific pavement, the size of the aggregate may also vary, the degree of aggregate, aggregate size, aggregate, water permeability and Aggregate of drainage particle size and the like can be used.

Using such aggregates and materials, in order to produce asphalt concrete of the present invention, 1 part by weight of aggregate heated to 150-200 ° C., 0.04-0.1 part by weight of colorless asphalt heated to 150-200 ° C., lime powder, limestone, Color asphalt concrete is prepared by mixing one or two or more 0.01-0.05 parts by weight of a filler such as cement, 0.006-0.018 parts by weight of urethane coating chip, and 0.001-0.005 parts by weight of pigment.

The asphalt asphalt concrete prepared by the above process may be transported to the site by a conventional method, laid and compacted, and the pavement may be paved. As compared with the conventional color asphalt concrete pavement, the paved color asphalt concrete pavement has significantly improved the problem of low temperature cracking in winter and the cracking caused by summer heat, and also the problem of plastic deformation due to the increase in summer temperature. It is a remarkable improvement. Therefore, the present invention is very useful to enable the activation of color road pavement using colorless asphalt.

The present invention will be described by the following examples.

(Example)

The present embodiment is to wrap a child protection area (school zone) of 3.5m in width 500m in length, the paving thickness is 5cm, the color is red, paved by overlaying the top of the existing asphalt pavement (overlay). This embodiment was carried out in the following process.

First step: manufacturing urethane coating chips

100 kg of a urethane chip of 1.2 mm or less in red was put into a mixer with an external heating device and heated to about 100 ° C. Then, 2 kg of colorless asphalt was added and mixed, and after 5 minutes, 8 kg of calcium carbonate and 10 kg of cellulose fiber were added and mixed, and then the mixture was transferred to a cooling mixer and cooled to about 50 ° C. or less, and then a predetermined size. By cutting into a urethane coating chip was prepared. This prepared urethane coated chip was divided into 10 units for ease of use and stored in a PE bag. The reason for storing them in PE plastic bags is that PE plastic bags are melted at about 130 ° C., so that the asphalt concrete pavement can be put into asphalt concrete without using the bag without peeling it.

 2nd process: manufacturing colored asphalt concrete

1000 kg of the aggregate having the particle size distribution shown in Table 1 below was heated to about 180 ° C. and put into an asphalt concrete mixing mixer.

Table 1: particle size distribution of aggregates

   Checker Body pain and weight percentage (%) 19 mm 13 mm No. 5 No. 8 No. 30 No.50 No. 100 No. 200 13mm gap particle size 100 95 -100 35 -55 30 -45 20 -40 15 -30 5 -15 4 -10

About 10 kg of the urethane coated chip prepared in the electrical process was added to the mixing mixer to mix with the aggregate for about 5 seconds. About 60 kg of the colorless binder heated to about 160 ℃, about 6.5 kg of red inorganic pigment, about 30 kg of calcium carbide as a filler was added and mixed for about 45 seconds to prepare color asphalt concrete.

Third Process: Road Paving

The color asphalt concrete produced in the electrical process was transported to the site in a truck, and installed in the asphalt concrete. Then, four round trips to Macadama roller, six tire tires, and three round trips to Tandem Rollers were completed to complete the paving work. After confirming that the temperature of the package was about 50 ℃, the child protection area was opened.

Stability, dynamic stability, elastic recovery coefficient and field density were tested for the package packaged according to the present example, and the test results were as shown in Table 2 below.

Table 2: Test result of this example

Item Stability (kg) Dynamic Stability (times / mm) Elastic recovery coefficient (5) Field density Cantabros Loss Rate (%) The present invention 1240 9500 3154 2265 7 standard More than 500 More than 4000 - - 20 or less

In Table 2, stability indicates strength at about 60 ° C, dynamic stability is resistance to plastic deformation, recovery elastic modulus is a criterion for low temperature cracking, and site density indicates compaction rate according to compaction rate. The bro loss rate is a standard for the surface peeling of the aggregate.

As shown in Table 2, in the present invention, the stability, the dynamic stability, the recovery modulus, the field density, and the cantabro loss were excellent. For reference, the lower the elastic recovery coefficient, the better. In general asphalt concrete, the elastic recovery coefficient is higher than 9000. In the case of the present invention, the elastic recovery coefficient is 3154, which is very low than general asphalt concrete, and the dynamic stability is much better than that of general asphalt concrete.

Claims (3)

Gelatinizing the surface by heating it to 60-120 ° C. in a manner in which a Urentan chip having a foaming rate of 30% or more and 2 mm or less is placed in a mixer and heated outside of the mixer to heat the chip so that heat does not come in direct contact with the chip; Adding 0.01-0.03 parts by weight of urethane or colorless asphalt binder to 0.01-0.03 parts by weight of cement or calcium carbonate or a mixture thereof into 1 part by weight of the urethane chip of the surface gelation step in which the surface is gelled in the previous step; Manufacturing a urethane coating chip by cooling and cutting the mixture of the above step at room temperature; And A method of manufacturing colored asphalt concrete using colorless asphalt comprising the step of mixing the urethane coating chip prepared by the electrical step with colorless asphalt and aggregates, fillers, pigments that are common asphalt concrete materials. According to claim 1, 1 part by weight of aggregate heated to 150-200 ° C 0.04-0.1 part by weight of colorless asphalt heated to 150-200 ° C, at least one selected from lime powder, limestone, cement as a filler 0.01-0.05 Part by weight, 0.006-0.018 parts by weight of urethane coating chip, 0.001-0.005 parts by weight of a pigment for producing colored asphalt concrete using colorless asphalt. Color asphalt concrete produced according to claim 1.