JPH04102607A - Construction method for asphalt admixture - Google Patents

Abstract

PURPOSE:To make repairs with hardening time significantly shortened by applying high viscous asphalt admixture close to the surface of a position to be repaired, and thereby injecting low viscous asphalt admixture into cavities located in the inner side of a covered layer formed by high viscous asphalt admixture so as to be filled in. CONSTITUTION:High viscous asphalt admixture 1 in a patty state the viscosity of which is adjusted in response to the size of cracks and their inclination, is applied upward from the lower section of the cracks in such a way that the neighborhood of a cracked surface is covered. In the second place, low viscous asphalt admixture 4 is injected into cavities 3 located in the inner side of a high vixcous asphalt admixture layer by means of a nozzle or a polyvinyl container. After that, processing as mentioned above is repeated as required, and when the cracks 2 are sufficiently filled with high and low viscous asphalt admixtures, processing is suspended, and repaired sections are thereby left alone as they are. Filled asphalt admixtures 1 and 4 are integrated with time so as to be speedily hardened. Meanwhile, a phase conversion hardening agent composed of at least, one chemical selected out of acid anhydride, acid chloride, acid amide and acid azide, is blended with high and low viscous admixtures.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for applying an asphalt mixture suitable for repairing cracks on asphalt-paved roads and on slopes of dams.

(Conventional technology) Traditionally, methods of pouring molten asphalt or molten asphalt mixed with rubber latex have been widely used to repair cracks on sloped surfaces such as dams and asphalt-paved roads. A method of injecting an asphalt-based emulsion or an appropriate curing agent added thereto is also used.

However, molten asphalt cannot sufficiently fill up to the tip of the crack as it cools and solidifies immediately after injection, and it only covers the crack surface, weakening the strength of the repaired area and causing peeling. It had the disadvantage of being easy to use. Especially in the case of a slope with a steep angle of inclination, when pouring molten asphalt, molten asphalt flows around the construction site! lt: Does it cause dirt and waste of forest materials? A serious problem has arisen due to industrial danger (f = drowsy).

On the other hand, asphalt-based emulsions are easy to handle and safe, and have excellent permeability, but on the other hand, because they lack and contain a large amount of water, their viscosity is low and they tend to run out easily, resulting in the release of nitrogen. *T Thin crack # Even if it is hardened, it takes more than a week to harden.In addition, there is a problem that the volume decreases significantly after dry-smoking hardening. Almost of no practical use.

Therefore, the present applicant added an acrylic acid (or methacrylic acid) compound, a styrene copolymer, etc. as a hardening agent to the asphalt emulsion as needed, and immediately added an inorganic filler [to the asphalt emulsion]. A method has already been proposed in which the viscosity of the emulsion is adjusted and the flow of the low viscosity asphalt emulsion is replaced with a high viscosity asphalt emulsion while reducing the amount of fat J1 and L7 (Japanese Patent Application 'P-1-305029).

However, even with this method, the curing of high-viscosity asphalt-based emulsions is conditioned on the release of water, so if it rains before the water has completely evaporated, the construction material will flow out and cause problems. was there. There was an FF11N that could not be opened to traffic for about 12 hours to 1 day while the applied surface hardened.

In the case where a curing agent such as the above-mentioned styrene copolymer is added, the curing agent has the effect of disrupting the charge balance of the asphalt emulsion and making it easier for water molecules to separate from the asphalt particles. 1. Although the release of moisture is accelerated and the curing time is slightly shortened, it takes approximately one week for the inner surface to completely harden, and the problem is that the mechanical strength during this period is insufficient. there were.

In addition, in the conventional methods described above, curing time is
- It was not possible to adjust or control according to the site or work situation, and it was not possible to respond to various situations.

(Problems to be Solved by the Invention) In view of the above 3F points, the present invention provides a method for repairing cracks on sloped land by easily and safely working on the first day of the morning, sufficiently penetrating the inner part of the crack, and shortening the curing time. Significantly shortened fl,, f
,: The purpose of the present invention is to provide a construction method for an asphalt mixture that can perform repairs with good properties.

(Means for Solving Problems) The present invention provides a method for applying an asphalt mixture on an inclined surface, in which an asphalt mixture is filled into an application site on an inclined surface and hardened. A high viscosity asphalt mixture made by adding at least one selected from acid anhydrides, acid chlorides, acid amides, and acid azides to a mixed solution in which the agent is uniformly dispersed is added to the underarm area surface 1. ' = applied near f - ■ One step in which a low viscosity asphalt mixture containing no inorganic filler or a small amount of inorganic filler is applied to the male part f. 1. The high viscosity asphalt mixture in I is injected and filled into the voids inside the coating layer. Is it possible to repeat at least one cycle with I culm? This article relates to a construction method for an asphalt mixture having the following characteristics.

Each component used in step (a) of the present invention will be explained below.

The asphalt-based emulsion used in step J of (a) is used, and conventionally used general-purpose natural 7゛sphalt, petroleum asphalt, etc. are melted and ironed in step 11. There are products with a solid content of about 50% by weight or more, such as asphalt emulsion emulsified with an emulsifier, or rubber latex with heat-molten asphalt added, and 1L rubber asphalt containing an emulsifier and a dispersion stabilizer.

Asphalt-based emulsions such as H6 are used for repairing cracks on paved roads, and are often used to repair cracks due to cold or hot temperatures or vehicle damage. ! J & shrinkage repeats, so it is preferable to use a rubber asphalt emulsion that can sufficiently follow this. S: In cold regions 1, the asphalt emulsion becomes too thick and easily cracks and peels, so it is essential to use a rubber-asphalt emulsion. Furthermore, in the asphalt emulsion of No. 1-71, at least one selected from acid anhydrides, acid chlorides, acid amides, and acid azides (hereinafter collectively referred to as "phase inversion curing agent") reacts with water. Anionic materials are preferable for quick curing because they act with the acid produced to cause a phase inversion reaction and harden.

In the present invention, an inorganic filler is first added to such an asphalt-based emulsion and dispersed sufficiently uniformly. Examples of the inorganic filler include calcium carbonate powder, activated clay, kaolin, silica sand, silica sand, and talc. , pearlite, bentonite, carbon, etc., which can increase the viscosity of the asphalt emulsion, can be used. In addition, the blending amount is 5 to 100 parts by weight per 100 parts by weight of the solid content of the asphalt emulsion.
Parts by weight are preferable. If the amount is too small, sufficient viscosity will not be obtained, and when it is installed near the crack surface from the bottom to the top of the construction site, it will drip down, and the crack surface will not be able to be covered securely. In addition, if the amount is too large, the asphalt particles in the asphalt emulsion will coagulate with each other, causing a so-called decomposition reaction, which will make the surface extremely sticky and difficult to handle, and will solidify to the point that it is impossible to form it into any shape. There is the inconvenience of having an accent. The viscosity of asphalt-based emulsions containing these inorganic fillers also depends on the particle size of the inorganic filler; in other words, if the particle size is small, high viscosity can be obtained even if the amount added is reduced. Therefore, it is only necessary to determine appropriate values for the particle size and blending amount.

In the present invention, a phase inversion curing agent is added and mixed directly or dissolved in a solvent to a liquid mixture in which an inorganic filler is uniformly dispersed in an asphalt emulsion in advance. If the phase inversion curing agent is added before dispersing the inorganic filler, the whole will harden quickly, making it impossible to uniformly disperse the inorganic filler. Phase change curing agents include acid anhydrides, acid chlorides,
At least one selected from acid amides and acid azides. Acid anhydrides, acid chlorides, acid amides, and acid azides react with water to produce carboxylic acids, so O/W type like the above asphalt emulsion (i.e., a type in which oil particles are dispersed in water) When added to an emulsion, it reacts with water to reduce the water content and generate acid, lowering the overall pH of the emulsion and converting it to a W2O type (i.e., water particles dispersed in oil). Let them mix and harden the whole thing quickly.

In addition, in the present invention, it is preferable to use an appropriate amount of incyanate in combination with these phase inversion curing agents, as this makes it easier to adjust the curing reaction time. After aging, it produces amine and carbon dioxide, which works to reduce the water content in the emulsion, but since it does not produce acid, the phase inversion curing reaction is not as fast as with acid anhydrides.

Therefore, by appropriately adding incyanate, the phase inversion curing time can be adjusted to be slow. However, if a large amount of incyanate is added, the carbon dioxide generated may cause foaming and the phase inversion curing time may become significantly longer. It is desirable to do so.

In addition, the reaction rate of each component with water is approximately in the order of acid azide, isocyanate, acid chloride, acid anhydride, and acid amide.Use these in appropriate combinations to adjust the time required for curing. Just do it.

As the acid anhydride, methyltetrahydrophthalanhydride M (
Me-THPA), 4-methylhexahydrophthalic anhydride M (4Me-HHPA), dodecenyl succinic anhydride (DDSA), hexahydrophthalic anhydride (the above,
liquid at room temperature), phthalic anhydride, maleic anhydride, succinic anhydride, butanetetracarboxylic dianhydride, bicyclo(
2,2,2)-Octo-7-nin 2,3,5.6-tetracarboxylic dianhydride, pyromellitic dianhydride, cyclopentanetetracarboxylic dianhydride, 3,3°, 4° 4°-benzophenonetetracarboxylic dianhydride, 2.
2', 3,3°-diphenyltetracarboxylic dianhydride, ethylene glycol bisanhydrotrimellitate (solid at room temperature), methyl endomethylenetetrahydrophthalanhydride 1! (MEMTHPA> (liquid at room temperature) etc.

Furthermore, acid chloride, acid amide, and acid azide are each R
It is a carboxylic acid derivative with the structure of C0CJ, RC0NHz, Fj CON, where R is H or 01-1
A wide range of alkyl groups, aryl groups, etc. can be used. Specifically, acid chlorides include acetyl chloride, chloride 1
Examples of acid amides include formamide, acetamide, propionamide,
Butyroamide, penzamide, phenacetamide, nicotinamide, etc., and acid azides include formic acid azide, acylamino acid azide, etc.

In addition, as the isocyanate, monovalent dodecyl isocyanate, p-incyanatotoluene, chlorophenyl isocyanate, benzyl isocyanate (BZ 1 ),
Allyl isocyanate, divalent tolylene diisocyanate <TDI>, 4.4゜-diphenylmethane diisocyanate (MD I), 4.4''-difunyl ether diisocyanate, 3.3゛-dimethyl-4,4'
-diphenylmethane diisocyanate, 3.3°-dimethoxy to 4°4′-diphenylmethane diisocyanate, 3°3′-dimethyl-4,4°-diphenylpropane diisocyanate, 3,3′-Schifs, nylmethane diisocyanate, 3,3 °-Diphenylsulfone diisocyanate, 3.3'-diphenylsulfide diisocyanate, hexamethylene diisocyanate ()IM
D I ), nonamethylene diisocyanate, 3-methyl-hepta, methylene diisocyanate, 2,1]-
Trivalent desmodur R (DD
-R"), Desmodule DR, Desmodycol T
H (hereinafter referred to as 14, all product names manufactured by Bayer), etc.
Furthermore, there are urethane prepolymers (average molecular In ~. number; about 100 liters) obtained by polymerizing these isocyanates.

These phase inversion curing agents or :il- isocyanic acid.
The solvent is preferably used by dissolving or dispersing it in a solvent. 2. For example, 7 alcohols such as ethanol, isobutanol, butanol, glycols such as ethylene glycol, diethylene glycol, and glycerin, ethyl acetate, i! Examples include esters such as butyl acetate, octyl acetate, and cyclohexyl acetate, as well as xylene, toluene, benzene, and acetone.

The total amount of these phase inversion curing agents, including incyanate, is preferably 0.1 to 100 parts by weight based on 100 parts by weight of the solid content of the asphalt emulsion.If it is less than this, phase inversion reaction may occur. is very slow, and if the amount is more than 100 Hz, it will solidify instantly upon addition, resulting in a L7 delay and poor workability. The viscosity immediately after mixing is 100 to 2000 bois (25℃
) A high viscosity asphalt mixture can be obtained. In addition, water-absorbing substances such as finely powdered silica gel and activated alumina may act as a phase inversion agent, but they do not have good dispersibility and are partially hardened, so they cannot be used as phase inversion curing agents in the present invention. However, rapid uniformity and curing cannot be obtained.

Used in (b) 17 of the present invention! l! Low viscosity spherical admixtures containing no or a small amount of mechanical filler are 1. ] The same asphalt emulsion as in the high-viscosity asphalt mixture for construction used in culm (a) is blended with the same phase inversion curing agent, and the viscosity immediately after mixing is about 100 voids (at 25°C). It is preferable that a material with a high fluidity V"] penetrates at the tip J of the crack.

In addition to the following components, anti-aging agents and plasticizers (for example f! It is possible to control the curing speed by controlling the mechanical properties and adhesive strength after curing. ! Solvent i=J-soluble polymeric substance, such as polyamide, polynisder, polyurethane, alkylide resin, acrylic resin,
A small amount of uboxy resin, polyvinyl chloride, silicone resin, polyvinyl acetate, etc. may be added.

The present invention is carried out as follows using the A viscosity asnoalto mixture and the low viscosity asphalt mixture as described above. The drawing shows a crack in a slope to be constructed according to the present invention.

First, in the present invention, a putty-like high-viscosity asphalt mixture 1 whose viscosity is adjusted according to the size and slope of the crack is applied upward from below the crack 2 so as to cover the vicinity of the crack surface 1 Next, a low viscosity asphalt mixture 4 is injected into the void 3 inside this high viscosity asphalt mixture layer using a nozzle or a plastic container. Thereafter, this process is repeated as necessary, and when the crack 2 is sufficiently filled with the high-viscosity asphalt mixture and the low-viscosity asphalt mixture, the operation is stopped and the cracks are allowed to stand. The filled asphalt mixtures 1 and 4 become integrated over time and harden quickly.

It takes about 10 to 80 minutes to harden to the point where it can be released to traffic.
It's a minute.

(Function) According to the method of the present invention, since the high viscosity asphalt mixture is first provided in step (a) so as to cover the vicinity of the crack surface, the low viscosity asphalt mixture in the subsequent step (b) is It does not flow out of the cracks, causing no contamination of the surrounding area or waste of materials, is easy to work with, and is safe because it can be installed at room temperature, and can shorten work time. Furthermore, since a low-viscosity asphalt mixture with excellent permeability is used in step (b), the asphalt mixture can be filled up to the tip of the crack without any gaps.

Furthermore, since the high-viscosity and low-viscosity asphalt mixtures contain a phase inversion curing agent consisting of at least one selected from acid anhydrides, acid chlorides, acid amides, and acid azides, this method can After construction, the entire structure hardens quickly. In other words, because the phase inversion traps water in the form of fine particles in the asphalt components, the mixture as a whole has sufficient mechanical strength, rather than drying and evaporating the water, making it possible to remove traffic restrictions during road repair. The time required for this is dramatically reduced. The water trapped in the asphalt components then gradually evaporates until complete hardening occurs. Immediately after phase inversion, the cured product is sufficiently cured to the extent that it does not interfere with rain or vehicle running, and its overall properties, such as mechanical strength, water-stopping effect, and the presence or absence of runoff, are completely cured. It reaches almost 70% of the total. The curing time up to phase inversion varies depending on the selection of the ingredients, but it is generally in the range of several minutes to several hours, which is shorter than the curing time of conventional asphalt-based emulsions or mixtures of them and curing agents, which ranges from several days to one hour. This is dramatically shorter than a week. By appropriately selecting the proportions of the ingredients in the high-viscosity and low-viscosity asphalt mixtures and using incyanate in combination, the curing time can be more precisely adjusted, reducing the time required at the construction site and during work. It can fully respond to various conditions and can perform highly reliable construction.

(Example) Examples of the present invention will be described.

fruit! ! Examples 1 to 15 A high viscosity asphalt mixture was prepared by mixing a phase inversion curing agent into an asphalt emulsion in which an inorganic filler was uniformly dispersed in advance in the formulation shown in the table. In addition, each component used was adjusted as follows.

- Asphalt emulsion: An anionic asphalt emulsion with a solid content of 60%, which is obtained by adding an anionic surfactant and a dispersion stabilizer to asphalt and stirring and dispersing it.

Rubber asphalt emulsion: 80% solids obtained by adding anionic surfactant and dispersion stabilizer to SBR latex while dropping heated and molten asphalt, stirring and dispersing.
Anionic rubber asphalt emulsion.

The obtained high-viscosity asphalt mixture was immediately applied near the surface of cracks on the slope of an asphalt-paved road by the method shown in the previous drawing, and step (a) was carried out. The construction conditions were a temperature of 20°C, an inclination angle of 3°, and an average crack size of 1.
0 m, average depth 10 cm, and length 3 m.

Next, a low viscosity asphalt mixture is produced by adding no inorganic filler in the formulation of the high viscosity asphalt mixture of each example, and this is filled into the voids inside the high viscosity asphalt mixture layer, and step (B) is carried out. I did it. The repair was completed by repeating this process several times until the entire crack was filled without any gaps, and then left in the air to completely harden.

In each of the examples, there was no asphalt mixture flowing out during the work, and the inside of the cracks could be sufficiently filled with the tip. Also, the time it takes from the completion of repairs to when traffic can be released (
Phase inversion curing time) was measured.

The results are shown in the table.

Comparative Example ~2 For comparison, each component was adjusted according to the formulation shown in the table for a product using a conventional styrene copolymer as a curing agent.

The styrene methacrylate copolymer emulsion is
Dissolve 10 parts of methacrylic acid cyclohexyl monomer, 10 parts of styrene, and 20 parts of water, 4 parts of surfactant, and ammonium persulfate as a polymerization catalyst]
After one polymerization was carried out by finger stirring at 85° C. for 6 hours, ammonium water was added dropwise to p1].

After carrying out step (a) above on the same crack as in Example 1 using the asphalt mixture obtained in this way, the low viscosity of the formulation without the addition of inorganic filler L5 in this formulation. The mixture was filled into the void and Step J2 (b) was performed.

The repair was completed by repeating this process several times using J to fill the entire crack without any gaps, and then left in the air to completely harden. In Comparative Example 1, material flow [5] occurred during step (a), contaminating the surrounding area. The phase inversion curing time until it can be opened to traffic after completion of repair is as follows in Comparative Example 2.
It took about 1 week for the comparative example, and almost all of the material washed out when the hardener was exposed to rain.

Comparative Example 3 In addition, as Comparative Example 3, a high viscosity asphalt mixture containing an excessive amount of inorganic filler was produced. That is, 200 parts by weight of talc was added to 100 parts by weight of the solid content of the asphalt emulsion in a plastic container and stirred. When this process was carried out, a lump-like lump with extremely poor mutual pine properties was formed, making it impractical for use in crack repair.

(Effects of the Invention) As described above, according to the method for applying an asphalt mixture of the present invention, when repairing road cracks on sloped land, the repair material is sufficiently penetrated to the tip of the crack, there is no waste such as outflow, and the repair material is not wasted. The curing time is significantly shortened, allowing for highly reliable construction.

[Brief explanation of drawings]

The drawing is a sectional view showing a crack repair site that is in the process of being repaired according to the present invention. 1...High viscosity asphalt mixture 2...Cracks on slope 3...Gap 4...Low viscosity asphalt mixture

Claims (2)

[Claims] (1) In the method of applying an asphalt mixture on an inclined surface, in which the asphalt mixture is filled into the application site on the slope and cured, (a) a mixed liquid in which an inorganic filler is uniformly dispersed in an asphalt emulsion; A step of providing a high viscosity asphalt mixture containing at least one selected from acid anhydrides, acid chlorides, acid amides, and acid azides near the surface of the construction site from the bottom to the top; b) The step of injecting and filling a low-viscosity asphalt mixture containing no or a small amount of inorganic filler into the voids inside the coating layer of the high-viscosity asphalt mixture at the construction site is repeated at least once. Construction method of asphalt mixture. (2) The liquid mixture in the high-viscosity asphalt mixture contains 5 to 100 parts by weight of an inorganic filler based on 100 parts by weight of solid content of the asphalt emulsion. Asphalt mixture construction method.