JPH06192579A - Asphalt composition for paving - Google Patents

Abstract

PURPOSE:To obtain a paving asphalt composition hardly peeling an aggregate and asphalt in a pavement. CONSTITUTION:This paving asphalt composition is characterized by including polypropylene or polyethylene modified with maleic anhydride therein.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an asphalt composition for paving.

[0002]

2. Description of the Related Art Drainage pavement is a pavement that has a slight improvement in the problem of rainwater flowing into rivers and is specific to the development area. I am collecting. In addition, drainage pavement is a very preferable pavement for important traffic routes such as highways because water does not collect on the road surface and thus does not cause the hydroplane phenomenon and the car does not splash water. . However, inside the drainage pavement,
Since there are many voids, through which rainwater is drained, the probability of contact with water is much higher than with conventional pavement, and water has accumulated in some void holes and has been in contact with water for a long time. It becomes a state. For this reason, there is a problem that peeling easily occurs between the aggregate and the binder coating it.

[0003]

[Purpose] An object of the present invention is to provide an asphalt composition for paving in which the aggregate and the asphalt on the paved road are difficult to separate.

[0004]

The present invention relates to a pavement asphalt composition containing polypropylene or polyethylene modified with maleic anhydride.

The polypropylene or polyethylene modified with maleic anhydride has a molecular weight of 1,000 to 2
50,000, acid value 3 to 70 mg KOH / g, especially 20
It is preferably from 60 to 60 mgKOH / g, and the acid value is usually 0.
This corresponds to the acid value of what was reacted with 5 to 15% by weight of maleic anhydride. The content rate is 0.
It is preferably from 1 to 5.0% by weight.

[0006] The asphalt is at least one asphalt selected from the group consisting of straight asphalt, blown asphalt, propane deasphalted asphalt, polymer modified asphalt and synthetic asphalt, the penetration of which is 20-100. Is preferred.

[0007]

【Example】

(1) As polypropylene or polyethylene modified with maleic anhydride, those having the physical properties shown in the following table were used.

[Table 1] Measurement method Specific gravity: D-792 Molecular weight: GPC method (Mn) Melt viscosity: BL type viscometer Softening point: JIS-K2531 IZOD impact strength: ASTM D-256 Bending strength: ASTM D-790 Bending elastic modulus: ASTM D-790 Compressive strength: ASTM D-695 Heat distortion temperature: ASTM D-648 The maleic anhydride modified resin No. 1 and No. No. 2 is a low molecular weight polypropylene molecule having maleic anhydride bonded to the end thereof. 1 is 90% by weight of polypropylene and 10% by weight of maleic anhydride.
o. 2 is polypropylene 95% by weight, maleic anhydride 5
It is a percentage by weight. The maleic anhydride modified resin No. 3 is a low molecular weight polyethylene molecule having maleic anhydride bonded to the end thereof, and is 95% by weight of polyethylene.
And 5% by weight of maleic anhydride.

(2) Composition of used asphalt composition for paving

[Table 2] * 1 Asphalt used for general pavement with a penetration of 60-
80, and in the present example, a needle penetration of 71 and a softening point of 47.0 ° C. was used. * 2 Modified asphalt containing rubber and resin specified in the paving guideline, with a penetration of 55 and a softening point of 60.0 ° C was used. * 3 Modified asphalt containing rubber and resin used for drainage pavement with penetration of 72 and softening point of 89.0 ° C.

[Table 3]

(3) Results of water resistance evaluation test

[Table 4] A condition: what was soaked in 80 ° C hot water for 30 minutes B condition: what was soaked in 80 ° C hot water for 24 hours No separation: ◎, separation: ×

[Table 5]

(4) Consideration Examples 1 to 4 In Examples 1 to 4 to which the maleic anhydride modified resin was added, as compared with Comparative Examples 1 to 3 in which the maleic anhydride modified resin was not added, in the water immersion cracking test, after 80 ° C. × 24 hr. The residual rate was significantly increased, and the peeling rate was greatly reduced. In the water immersion Marshall test, the residual rate is improved by about 10 to 20% after immersion at 60 ° C. for 7 days. It was also improved in the static peel test. Particularly in the case of straight asphalt 60/80, the effect of improvement by the additive is remarkable. From the above, it is considered that the use of the maleic anhydride-modified resin as an additive in various asphalts significantly improved the adhesiveness between the binder and the aggregate, and thus improved the water resistance. Comparative Example 4 In Comparative Example 4 in which the maleic anhydride-modified resin was added in an excessively large amount as compared with Examples 1 to 4, the thin film heating loss increased and the storage stability decreased.

[0011]

[Effect] According to the present invention, an asphalt paving composition having sufficient water resistance even when used for drainage paving can be provided.

Claims (3)

[Claims] 1. An asphalt composition for pavement, which comprises polypropylene or polyethylene modified with maleic anhydride. 2. The polypropylene or polyethylene modified with maleic anhydride has a molecular weight of 1,000 to 20,
The asphalt composition for pavement according to claim 1, having an acid value of 000 and an acid value of 3 to 70 mgKOH / g. 3. The paving asphalt composition according to claim 1 or 2, wherein the content of the polypropylene or polyethylene modified with maleic anhydride is 0.1 to 5.0% by weight based on the asphalt.