JP2003049073A - Asphalt mix and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce an asphalt mix that can safely and beautifully brighten the surfaces of paved roads by using a macadam size glass cullet having antistripping properties. SOLUTION: The asphalt mix comprises the glass cullet prepared by crushing waste glass into pieces of macadam sizes and removing the sharp corners and cellulose fibers prepared by purifying used paper sheets. The asphalt mix is produced through the following steps: the step where glass cullet is crushed in the macadam sizes; the step where the glass cullet is heated; the step where the heated glass cullet is admixed to asphalt heated up to a prescribed temperature; and the step where a suitable amount of the cellulose fibers is admixed to the asphalt mixture.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method of crushing recycled waste glass to a size equal to JIS No. 7 crushed stone (this is called crushed stone size) to form a glass cullet, and the glass cullet is used for road paving. The present invention relates to a glass pavement that is effectively used as a material, and more specifically, relates to an asphalt mixture prepared by mixing the glass cullet on the asphalt surface of the asphalt, rather than spraying the glass cullet onto the asphalt and a method for producing the same. It is a thing.

[0002]

2. Description of the Related Art Conventionally, an asphalt mixture having a structure in which glass is mixed with asphalt and a method for producing the asphalt mixture have been disclosed in JP-A-7-292258 and JP-A-8-12892.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
"Asphalt mixture with glass" of Japanese Patent No. 92258
In order to improve the adhesion between glass and asphalt,
Since a glass having a particle size of 2.36 mm or less is used, there is a serious drawback that it is difficult to sufficiently exhibit the characteristics of a glass pavement that shines brightly with light. Further, in the "method for producing a glass-containing asphalt mixture" disclosed in JP-A-8-12892, heat exchange is performed between a sanded glass sand at room temperature and an aggregate heated to a temperature higher than a predetermined temperature. Therefore, there is a problem that the process is complicated and the cost is high.

Therefore, the present invention intends to provide an asphalt mixture capable of safely and beautifully shining an asphalt pavement surface by using a crushed stone size glass cullet to which peel resistance is imparted, and a method for producing the same. To do.

[0005]

According to the present invention, glass cullets formed by crushing waste glass to a crushed stone size and removing the corners thereof and cellulose fibers purified from waste paper are mixed. An asphalt mixture comprising the glass cullet described above in an amount of 5 to 10% of the total weight, and the cellulose fiber described above in an amount of about 0.2%.

In the present invention, a step of forming a crushed stone size glass cullet from which corners are removed, a step of heating the glass cullet in the same manner as the crushed stone, and a step of mixing and stirring the glass cullet with asphalt at a predetermined temperature. And a step of introducing an appropriate amount of cellulose fiber into the asphalt mixture.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention replaces JIS No. 7 crushed stone, which is generally used as an aggregate of a dense particle size asphalt mixture (13F), and has a particle size of about 2.4 m.
m to 5.0 mm (preferably 2.36 mm to 4.75 m)
The glass cullet of m) is used. In addition, when forming the glass cullet, a step of removing the corners of the crushed glass fragments is added to the process of crushing the collected waste glass bottles with a crusher and subdividing it, so people and vehicles Is sufficiently secured. Further, the present invention, since the peeling resistance of the glass cullet is enhanced by the cellulose fiber described below, it has exactly the same performance as ordinary asphalt pavement, and it is possible to perform asphalt pavement excellent in design. It has become.

When kneading the above-mentioned asphalt mixture, the glass cullet is passed through the dryer of the asphalt plant in the same manner as in the case of heating crushed stones.
While heating to 8 ° C, set the asphalt temperature to 150 ± 5 ° C as usual. Then, both of them are mixed and stirred in a mixer to knead the asphalt mixture at about 160 ° C.

Generally, glass cullet has a crushed shape and a particle size distribution similar to those of natural aggregates, but it also has a drawback that the adhesive effect is poor due to its low surface roughness and low water absorption. There is. Therefore, the present invention is configured to enhance the peel resistance of the glass cullet by adding separately prepared cellulose fibers when the asphalt and the glass cullet are stirred and mixed by a mixer. The cellulose fiber used in the present invention is refined from recycled waste paper, and the necessary amount is divided into a small amount and put into each batch of the plant.

As described above, in the present invention,
Crushing to a crushed stone size, and removing the corners to form a safe glass cullet, heating the glass cullet like crushed stone, and mixing and stirring the glass cullet with asphalt at a predetermined temperature. Then, the asphalt mixture is produced through a step of introducing cotton-like cellulose fibers into the mixture.

[0011]

EXAMPLES Next, glass cullet and cellulose fibers used in the present invention were mixed at a compounding ratio as shown in Table 1 to prepare a sample, and a Marshall stability test was conducted. The results are shown below. Will be described. Regarding the synthetic particle size of each sample, the target particle size is 2.36 mm.
Passing rate is 52.5%, 0.075mm passing amount is 8.5%
It was created so that the same conditions would be set for each of them.

[0012]

[Table 1]

The Marshall stability test includes density, porosity, saturation, stability, flow value, aggregate porosity (VM).
A), stability / flow value (stiffness), residual stability, etc. were tested.

A. Regarding Density In all the formulations, the density increased with an increase in the amount of asphalt, and the maximum value was around 6.0%. In addition, the density curves are the same for all the formulations, and glass cullet is compounded (compound comparison No. 3 to compound comparison N).
o. In 4), the density tended to decrease as the blending amount increased. In the comparison between those containing cellulose fibers (Compounding comparison No. 2 to Compounding comparison No. 4) and those not containing them (Compounding comparison No. 1),
The compounded one showed a slightly lower value.

B. The porosity showed the same tendency as the density test described above, and no extreme change was observed.

C. Concerning the degree of saturation, in any combination, the degree of saturation increased as the amount of asphalt increased, and no extreme change was observed.

D. With respect to the stability, results were obtained in which the standard value (500 kgf or more) was sufficiently satisfied in any of the formulations, and there was a similar tendency that the stability decreased as the amount of asphalt increased. In addition, in the comparison between the one in which the cellulose fiber was mixed and the one in which the cellulose fiber was not mixed, the compounded one showed a slightly higher value. Further, when glass cullet was blended, the stability tended to decrease as the blending ratio became 5% and 10%.

E. Regarding the flow value, all the formulations showed a similar tendency. In the past, it was said that when cellulose fiber was added, the stability increased and the flow value also tended to increase.
The change of the flow value in this test was a little small value, and almost no change was observed.

F. About Aggregate Porosity (VMA) For VMA, the composition comparison No. In No. 1, the amount of asphalt was 5.5%, which almost coincided with the amount of central asphalt.
In addition, the compounding comparison No. In Nos. 2, 3 and 4, the minimum value could not be specified.

G. Regarding stability / flow value (staffness), all blends show a tendency to decrease with an increase in the amount of asphalt, and there is an almost linear decrease.
The maximum value could not be specified.

H. With respect to the residual stability, all of the blends satisfied the standard of "75% or more in the asphalt pavement net" is desirable.
Glass cullet 1 by adding cellulose fiber
Even in the case of 0% composition (composition comparison No. 4), peel resistance equal to or higher than that in the case of 0% glass cullet composition (composition comparison No. 1) was confirmed.

Next, based on the results of the Marshall stability test described above, the results of a comprehensive study of asphalt mixtures having the compounding ratios shown in Table 1 are shown below.

A) Blend comparison No. 1 (glass cullet 0
%, Cellulose fiber 0%) A general dense particle size asphalt mixture (13F).
The residual stability (water immersion for 48 hours) is also around 85%,
It can be judged that there is peeling resistance.

B) Compounding comparison No. 2 (glass cullet 0
%, Cellulose fiber 0.2%) A mixture of general dense particle size asphalt mixture (13F) with 0.2% of cellulose fiber. The optimum amount of asphalt is increased by 0.2% and the stability is also slightly increased. In addition, the residual stability increased by 6-7%,
It showed high peel resistance and the effect of cellulose fiber was recognized.

C) Mixing comparison No. 3 (Glass cullet 5
%, Cellulose fiber 0.2%) Compounding comparison No. The glass cullet was blended with 5% of No. 2 and no particular problem was found in the Marshall test results. When the test piece was cracked after the stability test, peeled glass cullet was confirmed, but the residual stability was about 90%, and it can be said that there is stability.

D) Blending comparison No. 4 (Glass cullet 1
0%, cellulose fiber 0.2%) The above-mentioned formulation comparison No. 1-Comparison No. No special changes were seen compared to those of No. 3. The residual stability was 89%, and it is recognized that the effect of adding the cellulose fiber is exhibited.

From the above results, 5% of glass cullet
It has been found that even an asphalt mixture containing 10% of the compound can be applied without any problem because the peel resistance is increased by adding 0.2% of the cellulose fiber.

[0028]

EFFECTS OF THE INVENTION When a road is paved using an asphalt mixture containing glass cullet, a part of the glass cullet appearing on the pavement surface shines beautifully when irradiated with sunlight or car lights. have. The present invention uses a crushed stone size glass cullet formed by a recycled glass bottle, etc., and uses it as an aggregate of such an asphalt mixture, and the glass cullet is made of cellulose fibers provided by recycling used paper. Since peeling resistance is added, not only the effect of improving the design of the road pavement surface, but also various remarkable effects such as effective use of resources, cost reduction, and durability of glass cullet Is played. Further, since the glass cullet used in the present invention has the corners of each strip removed, there is no problem in safety for people and cars, and further, without using crushed stones for heat exchange, glass Since the cullet itself is heated, there is an advantage that the manufacturing process can be simplified.

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 2D051 AD07 AE04 AE05 AF01 AF06                       AG01 AG06 AH02 AH03 EA03                       EA06 EB06                 4J002 AB012 AG001 DL006 FA042                       FD016 GL00

Claims (3)

[Claims] 1. In an asphalt mixture in which glass cullet provided by crushing waste glass is mixed at an appropriate mixing ratio, the glass cullet is formed into a crushed stone size with its corners removed. An asphalt mixture characterized by containing cellulose fibers purified from waste paper to enhance the peel resistance of glass cullet. 2. The above-mentioned glass cullet having a total weight of 5 to
The asphalt mixture according to claim 1, wherein the cellulose fiber is blended at a blending ratio of 10% and the cellulose fiber is blended at a blending ratio of approximately 0.2%. 3. A step of forming a crushed stone-sized glass cullet from which corners have been removed, a step of heating the glass cullet, a step of mixing and stirring the glass cullet with asphalt at a predetermined temperature, and introducing a cellulose fiber. A method for producing an asphalt mixture, comprising the steps of: