JPH09124900A - Asphalt composition for pavement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an asphalt pavement composition which can be used under usual pavement-repairing conditions, enables traffic opening in a shortened time after the completion of pavement repair with high resistance to wheel groove formation on the paved road surface by formulating a specific curing agent to an epoxy resin and admixing the mixture to a straight asphalt (may contain rubber and thermoplastic elastomer). SOLUTION: This composition is prepared by mixing (A) 10-40mass% of a mixture of an epoxy resin which contains a 14-20C saturated or unsaturated aliphatic amine as a curing agent and (B) 60-90mass% of straight asphalt (which may contain rubber or thermoplastic elastomer). The composition gives a drainage pavement of high void volume as well as high strength after road surface pavement.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has the same temperature conditions as general asphalt for mixing with an aggregate and compaction, and increases the porosity of the pavement to provide a pavement excellent in drainage. The present invention relates to a pavement asphalt composition which is excellent in workability and durability, such as high strength of a pavement after construction on a road and little occurrence of rutting.

[0002]

2. Description of the Related Art Drainage pavement using an open particle size type asphalt mixture having a porosity increased to about 20% in the surface layer of a pavement is used for preventing water splashing due to water retention on the road surface and hydroplaning during rain, It has excellent functions such as improved driving comfort and reduced traffic noise. Performances required of the asphalt binder used for such drainage pavement include excellent water resistance, high adhesive strength with an aggregate, and gripping power. As the asphalt binder that has been mainly used so far, there is a high-viscosity modified asphalt in which styrene-butadiene-styrene block copolymer thermoplastic elastomer is blended with straight asphalt, but construction of drainage pavement on heavy traffic roads. According to the actual results, rutting or clogging occurs relatively early, and it is also reported that the permeability function deteriorates. On the other hand, epoxy asphalt mixed with a thermosetting epoxy resin has high strength after curing, and can be expected to cure by suppressing the occurrence of rutting. Epoxy resin used for road pavement is a two-liquid mixture type with a curing agent, and reacts by mixing and heating both to obtain a cured product with a three-dimensional network structure, but the curing reaction has a high temperature. It will be faster. Aliphatic polyamines, polyamides, acid anhydrides and the like are used as the curing agent.

[0003]

However, when, for example, dimer acid polyamide is used as the curing agent, the curing reaction rate after mixing with the epoxy resin and asphalt is large, and the mixture is heated and mixed with the aggregate and used until compaction. Since the possible time, that is, the pot life is short, the temperature condition at the time of construction must be considerably lower than the mixing temperature of normal straight asphalt or modified asphalt and aggregate. Further, there is a problem in workability and workability such that it takes one month or more after the construction until the epoxy asphalt is completely cured, that is, it becomes possible to release traffic. Therefore, an object of the present invention is to carry out construction under the same mixing and compaction temperature conditions as for ordinary asphalt, and also to enable traffic release in a short time after construction, and yet the strength of the pavement is high and heavy traffic conditions In order to provide an asphalt composition for pavement in which rutting is less likely to occur.

[0004]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors have found that a saturated or unsaturated aliphatic monoamine having 14 to 20 carbon atoms as a curing agent for epoxy resins. It was found that an asphalt composition for pavement having excellent workability, workability, and durability can be obtained by using the above-mentioned, and based on this finding, the present invention has been completed.

That is, in the present invention, 60 to 90% by mass of straight asphalt or asphalt containing rubber / thermoplastic elastomer, or a mixture thereof, and 10 to 40% by mass of both epoxy resin and curing agent are blended. The above-mentioned curing agent is a saturated or unsaturated aliphatic monoamine having 14 to 20 carbon atoms, and an asphalt composition for pavement is provided. Hereinafter, the present invention will be described in detail.

As the straight asphalt used in the present invention, for example, the straight asphalt specified in JIS K 2207 can be mentioned. Preferred straight asphalt includes, for example, straight asphalt 40 to 60, straight asphalt 60 to 80, straight asphalt 80 to 100, straight asphalt 100 to 120, and the like, and particularly preferred straight asphalt includes straight asphalt 60 to 80 and straight asphalt 80. .About.100. Here, the number described after the straight asphalt means the penetration. The straight asphalt may be used alone or in combination of two or more. If the penetration of the straight asphalt is too small, the viscosity rises rapidly due to the reaction with the epoxy resin, resulting in poor workability and poor crack resistance after construction. On the other hand, if the penetration is too large, the asphalt composition for pavement has a low curing degree, and the strength and rutting resistance after construction are poor.

The rubber / thermoplastic elastomer-containing asphalt used in the present invention includes, for example, modified asphalt I type, modified asphalt II type or drainage pavement specified in the asphalt pavement summary (1992 edition). High-viscosity modified asphalt can be mentioned, but modified asphalt type II or high-viscosity modified asphalt is preferable. Examples of the rubber compounded in the asphalt include chloroprene rubber, styrene-butadiene rubber, natural rubber and the like, with chloroprene rubber and styrene-butadiene rubber being particularly preferable. As chloroprene rubber, it has a latex shape and a solid content density of 1.1.
It is preferably about 1.2 g / cm ³ . The weight average molecular weight is preferably in the range of 100,000 to 300,000. If the weight average molecular weight is too small, the modifying effect is small and it is necessary to increase the compounding amount. On the contrary, if the weight average molecular weight is too large, the compatibility decreases. The weight average molecular weight is measured by the GPC method and calculated in terms of polystyrene.

As the styrene-butadiene rubber, various styrene-butadiene rubbers containing styrene in an arbitrary ratio can be used, but the bound styrene content is 20 to 3.
It is preferably 0% by mass, particularly in the form of latex,
The solid content is 45 to 75% by mass, and the solid content density is 0.92 to
It is preferably 0.97 g / cm ² . If the solids content is too low, the compounding time for compounding the required amount will be long,
Workability deteriorates. Conversely, if the solids content is too high, the viscosity of the latex increases, making uniform mixing difficult. Also,
When the content of bound styrene is low, the effect of increasing the viscosity (60 ° C.) tends to decrease, and when the content of bound styrene is too high, the effect of improving elongation is likely to decrease. Since the chloroprene rubber hardly separates or deteriorates during heating and storage after compounding and mixing, an asphalt composition for pavement having excellent uniformity or property stability can be obtained. The rubber may be used alone or in combination of two or more.

Examples of the thermoplastic elastomer blended in the asphalt include styrene-butadiene-styrene block copolymer, styrene-isoprene-styrene block copolymer, styrene-ethylene-butadiene-styrene block copolymer and the like. And preferably a styrene-butadiene-styrene block copolymer. The styrene content of these styrene copolymers is 2
0 to 50 mass% is preferable, and 30 to 45 mass% is particularly preferable. If the amount of styrene is too small, the effects of improving toughness, tenacity, and viscosity (60 ° C) are reduced, and if the amount of styrene is too large, the compatibility with the base substrate composed of semi-blown asphalt and straight asphalt is reduced. Tend to do. Furthermore, the weight average molecular weight of this copolymer is preferably in the range of 50,000 to 400,000, and particularly preferably in the range of 100,000 to 350,000. If the weight average molecular weight is too small, the modifying effect is small and a large amount of compounding is required. On the other hand, if the weight average molecular weight is too large, the compatibility tends to decrease. The thermoplastic elastomer may be used alone, or 2
A combination of more than one species may be used.

The compounding ratio of the rubber is not particularly limited, but is about 10% by mass at maximum, preferably 1 to 8% by mass. If the blending ratio exceeds 10% by mass, the high temperature viscosity after mixing with asphalt becomes high and the workability becomes poor.
The blending ratio of the thermoplastic elastomer is not particularly limited, but is 2
10 to 10% by mass, preferably 3 to 8% by mass.
If the blending ratio is less than 2% by mass, the effect of improving toughness, tenacity, etc. is poor. Also, this blending ratio is 1
If it exceeds 0% by mass, the softening point after mixing with asphalt, the viscosity (60 ° C.), etc. will increase, and the mixability with the aggregate and filler will deteriorate.

In the present invention, either straight asphalt, asphalt containing rubber / thermoplastic elastomer, or a mixture thereof may be used.
The compounding amount of these asphalt base materials is 60 to 90% by mass.
And preferably 65 to 85% by mass. If the content of straight asphalt or asphalt containing rubber / thermoplastic elastomer is less than 60% by mass, the strength will be increased due to the increase in the amount of epoxy resin, but as a pavement asphalt composition, the flexibility and flexibility will be reduced and the thermal stress will be reduced. This may cause damage to the pavement due to breakage or fatigue damage.
On the other hand, when the blending amount exceeds 90 mass%, the epoxy resin blending amount is too small, resulting in insufficient strength, and rubbing of the pavement or clogging of the road surface is likely to occur.

The epoxy resin used in the present invention is usually used, and examples thereof include glycidyl ether type, glycidyl ester type, glycidyl amine type, linear aliphatic epoxide type, and alicyclic epoxide type. The glycidyl ether type is preferable, and bisphenol A diglycidyl ether is particularly preferable. The curing agent used in the present invention to react with the epoxy resin to form a three-dimensional network structure has 14 to 20 carbon atoms, preferably 1 carbon atom.
6-18 saturated or unsaturated aliphatic monoamines.
When the number of carbon atoms is less than 14 or more than 20, the melting point or curing reaction rate is not suitable for the working conditions up to mixing with asphalt base material, mixing with aggregate, and compaction.
Specific examples of the curing agent include, for example, oleylamine, hexadecylamine, pentadecylamine, heptadecylamine, octadecylamine, nonadecylamine, eicosadecylamine, and the like, preferably oleylamine, hexadecylamine, heptadecylamine, octadecylamine. It is an amine.

The composition of the curing agent in the epoxy resin is determined by the number of active hydrogens in the epoxy group in the epoxy resin and the amino group in the curing agent, and is optimal when the epoxy groups and active hydrogens are equimolar. It is preferable to select one active hydrogen of the amino group of the curing agent per one epoxy group. The composition of the curing agent for the epoxy resin is
Considering the viscosity and reaction rate of both, it is usually carried out at 40 to 60 ° C. In the present invention, the compounding amount of both the epoxy resin and the curing agent is 10 to 40% by mass, preferably 15 to 35% by mass. The range of the blending amount is the same as the range of the blending amount of the straight asphalt and the asphalt containing the rubber / thermoplastic elastomer.

The asphalt composition for pavement of the present invention can be produced by mixing an epoxy resin and a curing agent, and then mixing it with straight asphalt or an asphalt base material containing a rubber / thermoplastic elastomer at a predetermined ratio. The mixing temperature is not particularly limited, but is usually 130 to 170 in consideration of the mixing temperature with the aggregate and the compaction temperature.
It can be performed at ° C. Aggregates and fillers for road construction can be used in the standard particle size range for drainage pavement that meets the viscosity and quality standards described in the asphalt pavement summary (1992 version). If necessary, the pavement asphalt composition of the present invention may contain other additives which are usually added to pavement asphalt, such as an anti-stripping agent, a dispersant, and a stabilizer.

The method of applying the asphalt composition for pavement of the present invention can be carried out by mixing the asphalt composition for pavement and aggregate, laying them in a paving place, and rolling them. The procedure for mixing the pavement asphalt composition and aggregate is
In addition to the above, a mixture of an epoxy resin and a curing agent may be added at the time of mixing the asphalt base material of the straight asphalt or the asphalt containing rubber / thermoplastic elastomer and the aggregate. The mixing temperature with the aggregate is 130 to 170.
C., and the compaction temperature may be 120 to 160.degree.

[0016]

EXAMPLES Next, the present invention will be described more specifically by way of Examples and Comparative Examples. The present invention is not limited by these examples. In the Examples and Comparative Examples, the asphalt composition for paving was evaluated by the properties of the mixture with the aggregate, that is, the Marshall stability test, the wheel tracking test, and the cantablo test. The Marshall stability test and the wheel tracking test were carried out according to the Pavement Test Method Handbook (1988 edition), and the Cantablo test was carried out according to the Japan Road Public Corporation test method (1992 edition). Aggregates and fillers are in the standard particle size range for drainage pavement described in the asphalt pavement summary (1992 version), and the porosity after compaction by mixing with the asphalt pavement composition is about The composition was set to 20%. The types of aggregates used were No. 6 crushed stone, crushed sand, filler, and calcium carbonate. The compounding amount of the asphalt composition for pavement in the drainage mixture for pavement was determined by the adhesion test method of the drainage asphalt mixture (based on the Japan Highway Public Corporation test method (1992 version)) and the cantablo test. In each of the examples and comparative examples, the compounding amount was 4.5%.

Example 1 56 parts by weight of bisphenol A diglycidyl ether as an epoxy resin, and 4 parts of oleylamine as a curing agent.
After heating 4 parts by mass to 50 ° C., respectively, mix both,
40 mass% of the mixed solution and straight asphalt 60 to 80 heated to 140 ° C (penetration (25 ° C): 69)
60 mass% was mixed, and the obtained asphalt composition for paving was mixed with the aggregate heated to 170 ° C at a temperature of 145 ° C. The mixture thus obtained was aged at 140 ° C. for 1 hour, and then a predetermined specimen for each test was prepared under compaction conditions at 135 ° C. Table 1 shows the mixture test properties measured after curing the test piece at 60 ° C. for 72 hours.

Example 2 The same epoxy resin and curing agent as in Example 1, 30% by weight of a mixed solution obtained under the mixing ratio and temperature conditions of both, and styrene as a rubber / thermoplastic elastomer heated to 170 ° C. were used.
Butadiene-styrene block copolymer (styrene-butadiene mass ratio: 40/60, weight average molecular weight: 15
Modified asphalt II containing 5% by weight of
70% by mass of a mold (penetration (25 ° C.): 53) was mixed, and the obtained asphalt composition for paving was mixed with an aggregate heated to 180 ° C. at a temperature of 165 ° C. The mixture thus obtained was aged at 160 ° C. for 1 hour, and then a predetermined specimen for each test was prepared under the compaction condition of 155 ° C. Table 1 shows the mixture test properties measured after curing the test piece at 60 ° C. for 72 hours.

Example 3 59 parts by mass of the same epoxy resin as in Example 1 was used with 41 parts by mass of hexadecylamine as a curing agent, and 20% by mass of a mixed solution obtained under the same temperature conditions and heated to 170 ° C. Styrene-butadiene rubber (latex, solid content 50%, bound styrene content 2
3.5% by mass), and a styrene-butadiene-styrene block copolymer (styrene-butadiene mass ratio 30 /
70, weight average molecular weight 300,000) 4% by mass, 5% by mass each containing 80% by mass of a high-viscosity modified asphalt (penetration (25 ° C.): 49), and the obtained asphalt composition for paving. The material and the aggregate heated to 180 ° C. were mixed at a temperature of 165 ° C. The mixture thus obtained was aged at 160 ° C. for 1 hour, and then a predetermined specimen for each test was prepared under the compaction condition of 155 ° C. Table 1 shows the mixture test properties measured after curing the test piece at 60 ° C. for 72 hours.

COMPARATIVE EXAMPLE 1 The same epoxy resin and curing agent as in Example 1, 5% by mass of a mixed solution obtained under the mixing ratio of both and temperature conditions, and the modified asphalt containing rubber / thermoplastic elastomer as in Example 2 were used. Type II 95 mass% was mixed, and the obtained asphalt composition for paving and the aggregate heated to 180 ° C were mixed at a temperature of 165 ° C. The mixture thus obtained is heated to 160 ° C.
After aging for 1 hour, a predetermined specimen for each test was prepared under the compaction condition of 155 ° C. This test piece is 72 at 60 ℃
Table 1 shows the mixture test properties measured after aging.

Comparative Example 2 Mixture 2 obtained by using the same epoxy resin as in Example 1 with dimer acid polyamide as a curing agent and under similar temperature conditions.
Rubber heated to 0% by mass and 140 ° C. High viscosity modified asphalt containing thermoplastic elastomer (penetration (25
): 49) 80% by mass is mixed, and the obtained asphalt composition for paving and the aggregate heated to 170 ° C. are heated to 145 ° C.
Mixed at a temperature of. The mixture thus obtained is 1
After curing at 40 ° C. for 1 hour, a predetermined specimen for each test was prepared under compaction conditions at 135 ° C. This sample is 60 ℃
Table 1 shows the mixture test properties measured after curing for 72 hours.

[0022]

[Table 1]

In Examples 1 to 3, since the Marshall stability is high, the strength against a load is large, the deformation amount by the wheel tracking test is extremely small, and the dynamic stability is also extremely large, so that rutting hardly occurs. ,
Moreover, the adhesiveness to the aggregate was also good due to the loss amount in the cantablo test. In the provisional policy (draft) for the compounding design of drainage pavement (Dec. 1991), the properties sufficiently satisfy the criteria of Marshall stability of 4.9 KN or more and dynamic stability of 1500 times / mm or more. On the other hand, Comparative Examples 1 and 2 were inferior to the Examples in strength and rutting resistance.

[0024]

EFFECTS OF THE INVENTION The asphalt composition for pavement obtained by the present invention can provide a drainage pavement having an increased porosity of the pavement, and the pavement has a high strength after construction on a road and is free of rutting. Gives excellent performance such as workability and durability such as less generation. Therefore, the asphalt composition for paving of the present invention is extremely useful in practical use.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kiyomi Takagi 1134-2 Gongendo, Satte City, Saitama Pref.

Claims (1)

[Claims] 1. A straight asphalt or an asphalt containing a rubber / thermoplastic elastomer, or a mixture thereof in an amount of 60 to 90% by mass, and an epoxy resin and a curing agent both in an amount of 10 to 40% by mass, and the above curing. An asphalt composition for paving, characterized in that the agent is a saturated or unsaturated aliphatic monoamine having 14 to 20 carbon atoms.