JP2012149457A - Laying method of elastic paving body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laying method of an elastic paving body having improved water-resistant adhesiveness to a substrate paving body.SOLUTION: A surface of a semiflexible paving body 2 is polished and cleaned to have a ratio of exposed aggregate 5 area to the surface area of the semiflexible paving body 2 of 50% or more. The polished and cleaned surface is coated with a solution of a silane compound 7 and dried. The surface is then further coated with a primer and dried. An elastic paving body 3 is then laid thereon.

Description

  The present invention relates to a method for laying an elastic pavement, and more particularly to a method for laying an elastic pavement that can improve water-resistant adhesion and prevent peeling and turning.

  In recent years, an elastic pavement in which an elastic aggregate such as a rubber chip is consolidated with a resin binder is mainly used as a road surface structure for reasons of excellent noise reduction and impact resistance. The elastic pavement is laid by adhering to a pavement serving as a base laid on the roadbed, such as an asphalt pavement or a cement pavement. However, since the water-resistant adhesion between the elastic pavement and the underlying pavement is low, there is a problem that the elastic pavement is easily peeled off when rainwater or the like penetrates into the elastic pavement. In particular, if the end part is peeled off even a little, the turning will be enlarged due to traveling of the vehicle and the like, and the function as the road surface structure will be hindered.

  As a method for improving the water-resistant adhesion between the elastic pavement and the base pavement, for example, Patent Document 1 applies a mixture of silane and alcohol to the surface of the hard pavement that is the base pavement. is suggesting.

  However, the method described in Patent Document 1 is insufficient for improving the water-resistant adhesion.

JP-A-8-27712

  An object of the present invention is to provide a method for laying an elastic pavement that has improved water-resistant adhesion to an underlying pavement.

  An elastic pavement laying method according to the present invention that achieves the above object is to provide an elastic pavement formed by consolidating an aggregate containing at least an elastic aggregate with a resin binder on an underlying pavement having an aggregate. In the method of laying an elastic pavement bonded and laid, the surface of the base pavement is scoured so that the ratio of the exposed area of the aggregate to the surface area of the base pavement is 50% or more. The elastic pavement is laid after applying a silane compound solution to the surface of the polished pavement and drying, then applying and drying a primer on the surface. is there.

According to the laying method of the elastic pavement of the present invention, the surface of the underlying pavement is polished so that the ratio of the exposed area of the aggregate to the surface area is 50% or more, and then the silane compound is applied. Because the hydrolyzable group of the silane compound increases the affinity with the underlying pavement made of an inorganic material, and the adhesive area with the aggregate of the underlying pavement is large, the elastic pavement Since a body can be adhere | attached, the water-resistant adhesiveness of an elastic pavement body can be improved.
As the silane compound, it is desirable to use alkyl alkoxysilane. This is because the alkoxy group is chemically bonded to the inorganic material in the presence of moisture, and the alkyl group imparts water repellency, thereby improving the water-resistant adhesive strength with the base.

  The primer contains silicone oil, and it is desirable to use methyl hydrogen silicone oil as the silicone oil. This is because the highly reactive SiH group reacts with the OH group or the like on the base surface, and the methyl group is oriented in the surface direction of the base to obtain a high surface treatment effect and impart water repellency.

  After applying a tack coat on the dried primer, an elastic pavement is preferably laid. In that case, the tack coat contains silicone oil, and it is desirable to use silanol dimethyl silicone oil at both ends as the silicone oil. This is because the chemical bond with the resin forming the tack coat and the water repellency effect due to the methyl group can be obtained by the reactivity of both terminal silanol groups.

It is sectional drawing which shows the example of the road constructed by the laying construction method of the elastic pavement which consists of embodiment of this invention. It is sectional drawing which shows a semiflexible pavement. It is sectional drawing which shows the semi-flexible pavement where the surface was sharpened. FIG. 5 is a perspective view showing a semi-flexible pavement whose surface has been polished so that the ratio of the area where the aggregate is exposed is 50% or more. It is a perspective view which shows the semi-flexible pavement whose surface was polished so that the ratio of the area where the aggregate is exposed is less than 50%. It is sectional drawing which shows the semiflexible pavement which formed the layer of the silane compound dried on the surface. It is sectional drawing which shows the semi-flexible pavement which formed the layer of the dried primer on the layer of a silane compound. It is sectional drawing which shows the semi-flexible pavement which formed the layer of the tack coat on the layer of the primer. It is sectional drawing which shows the semi-flexible pavement which laid the elastic pavement on the layer of the tack coat. It is a graph which shows the result of an Example.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows a structural example of a road constructed by an laying method of an elastic pavement according to an embodiment of the present invention.

  In this road, a semi-flexible pavement 2 is laid on a base layer ascon 1 laid on a roadbed, and an elastic pavement 3 is bonded thereon.

  The semi-flexible pavement 2 is an asphalt mixture having a porosity of 20 to 28% composed of an aggregate having a 2.36 mm sieve passage of 5 to 20% by mass and an asphalt of 3.0 to 4.5% by mass. It has a structure in which cement milk is infiltrated. The elastic pavement 3 is obtained by consolidating an elastic aggregate and a hard aggregate with a resin binder.

  The construction method of the elastic pavement in such a road is demonstrated below based on FIGS.

  As shown in FIG. 2, the cross-section of the semi-flexible pavement 2 laid on the base layer ascon 1 has a structure in which the cement component 6 is filled in the gap between the aggregates 5 covered with the asphalt 4. Yes.

  First, as shown in FIG. 3, the surface of the semi-flexible pavement 2 is polished so that the ratio of the area where the aggregate 5 is exposed to the surface area of the semi-flexible pavement 2 is 50% or more. Sweep (polishing and cleaning). At this time, the surface is cleaned using cleaning means such as air, water, or a brush so that debris and the like when the semi-flexible pavement 2 is polished do not remain on the surface. If the ratio of the area where the aggregate 5 is exposed is less than 50%, the water-resistant adhesiveness of the elastic pavement 3 to be laid in a later process is lowered. The upper limit of the area ratio is naturally determined from the structure of the road, but generally the larger the effect, the better the effect.

  For reference, FIG. 4 shows a case where the ratio of the area where the aggregate 5 is exposed is 50% or more, and FIG. 5 shows a case where the ratio of the area where the aggregate 5 is exposed is less than 50%.

Next, as shown in FIG. 6, a solution of the silane compound 7 is applied to the surface of the semi-flexible pavement 2 that has been cleaned using a brush such as a roller brush at a density of 10 to ²⁰⁰ g / m ² , for example. And let it penetrate before drying. The silane compound 7 solution is prepared by dissolving the silane compound 7 in a solvent such as isopropyl alcohol, methyl ethyl ketone, or toluene.

  By applying and infiltrating the silane compound 7 in this manner, the affinity for the aggregate 5 that is an inorganic material is increased by the hydrolyzable group of the silane compound 7, so that the elastic pavement to be laid in a later step 3 is improved in water-resistant adhesion.

  The layer thickness of the silane compound 7 varies depending on the penetration depth into the semi-flexible pavement 2, but is preferably 0.1 to 50 μm, for example.

Moreover, as the silane compound 7, it is desirable to use an alkylalkoxysilane. This is because the alkoxy group is chemically bonded to the aggregate 5 in the presence of moisture and the alkyl group imparts water repellency, thereby improving the water-resistant adhesive strength with the elastic pavement 3 to be laid in a later step. . This alkylalkoxysilane is represented by the chemical structural formula Xn (R ¹ ) mSiR ² Y (n + m = 3, m = 0, 1), X, R ¹ and R ² are bonded to Si, X is a methoxy group, An alkoxy group having 1 to 6 carbon atoms such as ethoxy group, R ¹ is an alkyl group such as methyl group or ethyl group, R ² is an alkylene group having 1 to 20 carbon atoms such as methylene group, ethylene group or propylene group, Y is These include a hydrogen atom bonded to R ² , an amino group, a glycidoxy group, a methacryloxy group, a mercapto group, a halogen group such as a chlorine atom, and the like. Among them, Y is preferably a hydrogen atom from the viewpoint of imparting water repellency and improving water-resistant adhesive strength with the base.

Next, as shown in FIG. 7, the primer 8 is applied and dried at a density of, for example, 150 to 200 g / m ² using a brush such as a roller brush. The primer 8 is prepared by dissolving an isocyanate-terminated urethane prepolymer, monomeric isocyanate, a catalyst, and the like in a solvent such as ethyl acetate, methyl ethyl ketone, and toluene. The layer thickness of the primer 8 is preferably 50 to 150 μm after drying.

Next, as shown in FIG. 8, the tack coat 9 is applied at a density of, for example, 150 to 200 g / m ² using a brush such as a roller brush. The tack coat 9 is produced by dissolving a polyurethane resin made of a moisture-curable urethane prepolymer, which is a binder resin of the elastic pavement 3 to be laid in a later step, in ethyl acetate. The layer thickness of the tack coat 9 is preferably 50 to 150 μm after drying, for example.

  Then, immediately after the tack coat 9 is applied, the elastic pavement 3 is laid as shown in FIG.

  Since the elastic pavement 3 is laid in this manner, the elastic pavement 3 can be bonded by increasing the affinity with the aggregate 5 exposed on the surface of the semi-flexible pavement 2. The water-resistant adhesion of the elastic pavement 3 can be improved. In addition, before the silane compound 7 is applied, the surface of the semi-flexible pavement 2 is cleaned so that the ratio of the exposed area of the aggregate 5 to the surface area is 50% or more. In addition, the water-resistant adhesion can be further improved.

  The reason why the water-resistant adhesive property is improved by such polishing is that the surface where the aggregate 5 is polished has a higher adhesive strength than the surface where the cement is polished. This is due to both the difference in chemical bonding strength between the primer 5 and the difference in mechanical strength (brittleness) between the aggregate 5 and the cement component. Also, the surface of the semi-flexible pavement 2 that has been polished to be as smooth as possible by polishing is improved in water-resistant adhesion rather than expecting an increase in adhesion due to the anchor effect by roughening the surface. Can be made. This is because if the surface is rough, the convex portion becomes brittle, and a thin layer breakage occurs in which a small amount of the semi-flexible pavement 2 adheres to the primer 8.

  In this way, the two effects of increasing the affinity of the silane compound 7 at the adhesive interface to the aggregate 5 and the like and the increase in the adhesive force between the aggregate 5 and the primer 8 due to the cleaning are combined. And excellent water-resistant adhesiveness can be obtained. That is, the adhesive strength between the base pavement and the primer 8 can be made larger than the breaking strength of the base pavement.

  In order to further improve the effect of the silane compound 7 relating to water-resistant adhesion, it is desirable that the primer 8 and / or the tack coat 9 contain a silicone oil as a water repellent. The silicone oil to be contained in the primer 8 and the tack coat 9 is preferably methyl hydrogen silicone oil and both-end silanol dimethyl silicone oil, respectively. The former reacts with OH groups on the surface of the semi-flexible pavement 2 due to the highly reactive SiH group, and the methyl group is oriented in the surface direction of the semi-flexible pavement 2 to obtain a high surface treatment effect. This is because water repellency is imparted. Moreover, the latter is because the chemical bond with the resin forming the tack coat 9 and the water repellent effect by the methyl group can be obtained by the reactivity of both terminal silanol groups.

  In the present embodiment, the base pavement is the semi-flexible pavement 2 that is an asphalt / cement pavement, but is not limited to this. There may be. Examples of the asphalt pavement include an asphalt pavement in which a coarse particle size asphalt pavement and a dense particle size asphalt pavement are stacked in order from the bottom. Moreover, as a cement-type pavement, the concrete pavement which mixed the hard aggregate is illustrated. Even when these are used as an underlying pavement, it is possible to obtain the same effects as in the above embodiment.

[Example 1]
In the laying method of the elastic pavement shown in FIGS. 2 to 9, the water-resistant adhesive strength of the elastic pavement 3 when the ratio of the area where the aggregate 5 is exposed to the surface area of the semi-flexible pavement 2 is changed and cleaned. Each was evaluated, and the results are shown in FIG. The water-resistant adhesive strength was determined by immersing a test piece in which an elastic pavement 3 was laminated on a semi-flexible pavement 2 in water at 40 ° C. for 7 days, and then “Tensile Load Tester Techno Tester R-10000ND (Sanko Techno Co., Ltd.). It was measured by carrying out a tensile test using

  The composition of the specimen is as shown in the table below.

  It can be seen from FIG. 10 that the water-resistant adhesive strength is increased by performing the polishing. Further, when the area ratio at which the aggregate 5 is exposed is 50% or more, the water-resistant adhesive strength is larger than the tensile fracture stress (about 0.6 MPa) of the semi-flexible pavement 2. That is, since the semi-flexible pavement 2 is destroyed before the semi-flexible pavement 2 and the elastic pavement 3 are peeled off at the adhesive interface, the area ratio where the aggregate 5 is exposed is 50% or more. It can be seen that the water-resistant adhesive strength is in a practical range.

[Example 2]
2-9, the ratio of the area where the aggregate 5 is exposed to the surface area of the semi-flexible pavement 2 is 55%, the presence or absence of silicone oil contained in the primer 8, and the tack When the presence / absence of application of the coat 9 and the presence / absence of the silicone oil contained in the tack coat 9 are changed (Examples 1 to 5), and the presence / absence of application of the silane compound and the presence / absence of the primer 8 are changed (comparative example) 1-3), the water-resistant adhesive strength of the elastic pavement 3 was evaluated, and the results are shown in Table 2. The measurement conditions for the water-resistant adhesive strength and the composition of the specimen are the same as in Example 1. As the silicone oil contained in the primer 8 and the tack coat 9, methyl hydrogen silicone oil and both-end silanol dimethyl silicone oil were used, respectively. In Table 2, “◯” indicates “Yes”, and “X” indicates “No”.

  From the comparison between Example 1 and Comparative Example 2, it can be seen that the water-resistant adhesive strength is remarkably improved by the present invention. Moreover, it turns out that water-resistant adhesive strength can be enlarged by application | coating of the tack coat 9, or containing silicone oil from the comparison of Examples 1-5.

DESCRIPTION OF SYMBOLS 1 Base layer ascon 2 Semi-flexible pavement 3 Elastic pavement 4 Asphalt 5 Aggregate 6 Cement component 7 Silane compound 8 Primer 9 Tack coat

Claims (7)

In the laying method of the elastic pavement that adheres and lays the elastic pavement formed by solidifying the aggregate containing at least the elastic aggregate with the resin binder on the base pavement having the aggregate,
The surface of the base pavement is cleaned so that the ratio of the exposed area of the aggregate to the surface area of the base pavement is 50% or more, and a silane compound is formed on the surface of the cleaned pavement. A method of laying an elastic pavement, wherein the elastic pavement is laid after applying a solution of (2) and drying, then applying a primer thereon and drying.   The method for laying an elastic pavement according to claim 1, wherein the silane compound is an alkylalkoxysilane.   The method for laying an elastic pavement according to claim 1 or 2, wherein the primer contains silicone oil.   The method for laying an elastic pavement according to claim 3, wherein the silicone oil is methyl hydrogen silicone oil.   The method for laying an elastic pavement according to any one of claims 1 to 4, wherein the elastic pavement is laid after applying a tack coat on the dried primer.   The method for laying an elastic pavement according to claim 5, wherein the tack coat contains silicone oil.   The method for laying an elastic pavement according to claim 6, wherein the silicone oil is silanol dimethyl silicone oil at both ends.

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