JPS6149442B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of applying heated epoxy bituminous pavement.

Recently, pavements made of heated epoxy asphalt mixtures that use heated epoxy asphalt instead of pavement asphalt are more susceptible to traffic such as cars than pavements made of conventional heated asphalt mixtures (e.g. asphalt concrete). It has stability, flow resistance, wear resistance,
Due to its excellent durability, it is being considered for use in heavy traffic pavements, bridge surfaces, airport pavements, etc. However, the difficult construction method poses a major obstacle to its use. In other words, epoxy asphalt is composed of two components: a component containing an epoxy resin and a component containing a curing agent for the epoxy resin. The asphalt is mixed with one of these components (or both), and the curing agent is heated and reacted with the curing agent. A mold hardener is used. and,
A heated epoxy asphalt mixture is made by separately measuring and adding the above two components to the heated aggregate in a heated mixing plant, but if the measurements are not accurate, unreacted substances may remain in the hardened epoxy asphalt. Therefore, there was a risk that water resistance, weather resistance, etc. would deteriorate. Furthermore, although the curing reaction of epoxy asphalt progresses when heated, its pot life has been problematic. A heated epoxy asphalt mixture for pavement is created by adding and mixing two components of epoxy asphalt to heated aggregate in a heated mixing plant.
The work of transporting the epoxy asphalt to the paving site, leveling it at the paving location, and rolling it must be completed within the usable life of the epoxy asphalt. The pot life of commercially available epoxy asphalt is about 1 hour at a temperature of about 150°C, and it was extremely difficult to carry out this amount of work within this time due to traffic conditions and other reasons. Although it is possible to extend the pot life by lowering the heating temperature, the development of strength of the pavement will be delayed and it will take a long time to finally fully cure. As a result, there were major constraints during construction. Furthermore, the curing agent for the epoxy resin in epoxy asphalt is a polymerized dimer or trimer of dicarboxylic acid or tricarboxylic acid such as soybean oil or saffron oil, and its properties vary widely. This method had the disadvantage of increasing fluctuations in asphalt's curing time, pot life, etc.

As a method for improving such a construction method, Japanese Patent Publication No. 18506/1983 proposes a method for constructing pavement using a reactive binder consisting of two compositions.

When paving with a paving mixture consisting of two compositions, a reactive binder and aggregates, one composition of the binder is applied to the aggregates in advance at a mixture manufacturing plant. After mixing a certain amount to create an intermediate mixture, this intermediate mixture is transported to the paving site, and immediately before paving, a predetermined amount of another composition of the mixture is added and thoroughly mixed to create a curable pavement mixture, This is a pavement construction method in which this is spread to a predetermined thickness and finished.This method eliminates the disadvantage of pot life, but it is a reactive mixture with epoxy resin in one of the two compositions and epoxy resin in the other. Since it contains a curing agent for epoxy resin, it has the disadvantage that it is difficult to accurately measure and mix both compositions when mixing them at the paving site.

In addition, JP-A No. 52-102399 discloses that a heated mixture of paving aggregate and asphalt is mixed with an epoxy resin that is solid at room temperature, a curing agent such as acid anhydride, a compatibility improver such as vegetable oil fatty acid, and limestone powder. A method for producing a heated epoxy bitumen mixture for paving, which includes adding and mixing a pulverized granular composition mixed with a filler such as, etc., and the granular composition thereof are disclosed. However, the reaction products of epoxy resins and these hardening agents are hard, and dicarboxylic acids and tricarboxylic acids such as dimers and trimers of fatty acids such as soybean oil and saffron oil are used as hardeners. The flexibility is not sufficient compared to other materials. Furthermore, it has the disadvantage of poor compatibility with asphalt, requiring the use of a compatibility improver.

The present inventor has repeatedly researched heated epoxy asphalt mixtures, and has found that an aliphatic chain dicarboxylic acid having 12 to 28 carbon atoms obtained by synthesis reacts uniformly with an epoxy resin in heated and melted asphalt. It has been discovered that a reaction product with a solid epoxy resin, which has a higher molecular weight than a liquid one, has good compatibility with asphalt, and can also yield a cured epoxy asphalt product with good strength, flexibility, etc. We also discovered that these curing agents are easy to powder, and that the powdered curing agent can be kept in powder form at room temperature.Furthermore, we discovered that this powdered curing agent does not react at room temperature even if it is mixed with solid epoxy resin. We have now completed the present invention.

The purpose of the present invention is to improve the above-mentioned drawbacks and provide a construction method that is easy and quick to form a good pavement.
This is a further improvement over the method disclosed in the publication.

That is, the present invention provides a powder component () containing an epoxy resin with a melting point of 60° C. or higher and an epoxy resin curing agent comprising an aliphatic chain dicarboxylic acid having 12 to 28 carbon atoms, and a bituminous component (). Paving is performed using a heat-reactive epoxy bituminous binder consisting of two compositions, and aggregates, in which a predetermined amount of the aggregates and the bituminous component () are heated in advance in a heating mixing plant. mix to form an intermediate mixture;
The intermediate mixture is transported to the paving site, and immediately before paving, a predetermined amount of the powdered component () is added to the intermediate mixture and mixed to produce a heated epoxy bituminous mixture, which is then spread and finished to a predetermined thickness. The gist of this paper is a construction method for heated epoxy bituminous pavement characterized by:

The epoxy resin of the heat-reactive epoxy bituminous binder (hereinafter simply referred to as binder) used in the present invention is a bisphenol type epoxy resin with a melting point of 60°C or higher and has one or more epoxy groups in one molecule. The epoxy equivalent is 400 to 4000. Generally, a diepoxide having two epoxy groups in one molecule is used. Typical examples of 2 and 3 include Epicote 1001, Epicote 1004, Epicote 1007, and Epicote 1009 (all trade names, manufactured by Shell Chemicals), which are condensates of bisphenol A and epichlorohydrin, and Epicote 1001, which is a condensate of bisphenol A and epichlorohydrin, and Epicote 1009, which are condensates of bisphenol A and epichlorohydrin. Condensation products Deitsku Epiclon 1000 and Deitsku Epiclon 4000 (all products of Dainippon Ink, trade names), a portion of the bisphenol of the above epoxy resin is replaced with dicarboxylic acid to create an ether bond within the molecule. Examples include Deitsku Epicron 1030 and Deitsku Epiclon 4030 (both products of Dainippon Ink, trade names).
Polyglycidyl ether of a condensate of alkylphenol and aldehyde (including novolac type and resol type) can also be used in place of a part of the above bisphenol type epoxy resin with another epoxy resin.

The aliphatic chain dicarboxylic acid curing agent for epoxy resin used as a binder has a melting point of 60°C or higher and a carbon number of
The following general formulas (1) to (3) HOOC− (CH ₂ ) _l −COOH (1) HOOC− (CH ₂ ) _n −CH: CH− (CH ₂ ) _o −COOH (2) HOOC− (CH ₂ ) _p −CH:CH−(CH ₂ ) ₂ −CH:CH−(CH ₂ ) _p −COOH (3) where l is an integer from 10 to 20, m and n are from 4 to
The main component is one or more aliphatic chain dicarboxylic acids represented by an integer of 10, o and p being an integer of 4 to 10. These include OSK-DA SL-12, OSK-DA SL-16,
OSK-DA SL-20 (formula (1) above), OSK-DA UL
-16 (formula (2) above), OSK-DA UL-20 (formula (3) above)
formula) (all Okamura Oil products, product names).
These products have a melting point of 100°C or higher and are solid at room temperature, so they can be easily made into powder.

Bituminous components () used in the binder include asphalt such as straight asphalt, blown asphalt, semi-blown asphalt, propane deasphalt, cutback asphalt, natural asphalt (e.g. lake asphalt), coal tar, oil tar, and tar pitch. These include one type or a mixture of two or more selected from the above, and bituminous materials modified by adding rubber, synthetic polymers, etc. to these bituminous materials. In addition, resins rich in bitumen and asphalt are separated by treating heavy petroleum residue oil, petroleum fractions, asphalt, etc. with solvents, and modified petroleum resins obtained by high temperature treatment of heavy fractions rich in aromatic components. Synthetic asphalt, etc., which is made by mixing solid resins such as, etc., with heavy process oil, is also used as the bituminous component ().

In addition to the above, the bituminous component () has compatibility,
Various additives can be added to improve physical properties, workability, etc. Namely, coumaron/indene resin, alkylphenol resin, petroleum resin,
Resins such as natural terpene resins (including rodin and its derivatives), synthetic terpene resins, process oils, fats and oils, plasticizers, anti-aging agents, anti-peeling agents, etc. can also be added.

The amount of aliphatic chain dicarboxylic acid (hereinafter referred to as curing agent) relative to the epoxy resin used as the binder is an equivalent amount or a ratio close to the equivalent amount at which the epoxy group of the epoxy resin and the carboxyl group of the curing agent react. Further, the total amount of the epoxy resin and its curing agent is preferably within the range of 70 to 10% by weight of the binder.

The powder component of the binder () is an epoxy resin and a hardening agent, or an epoxy resin and a hardening agent, and a solid resin, coumaron indene resin, alkylphenol resin, petroleum resin, natural terpene resin, which also forms one component of synthetic asphalt. , a solid resin such as a synthetic terpene resin is added and mixed and crushed using a crusher (for example, a ball mill) to form a powder. Moreover, a powdered filler such as stone powder can also be added to these.

A predetermined amount of the powder component () of the binder and a predetermined amount of the bituminous component () are mixed and heated to 100℃, preferably 120℃.
By heating to the above temperature, a cured product with excellent physical properties as a binder can be obtained. The amount of component () relative to component () can be selected within a fairly wide range.

As aggregates, natural or artificial crushed stone,
The targets include gravel, sand, stone powder, etc., which are commonly used for general pavements or special pavements such as wear-resistant pavements, anti-slip pavements, and colored pavements.

A separate mobile mixer (for example, a pug mill) may be used as the mixer immediately before paving, but a batch type or connected mixer may be installed on the finisher for leveling the final mixture, or directly connected or connected to the finisher. A type mixer equipped with a device that can quantitatively mix the intermediate mixture and the remaining powdered components (2) and an auxiliary heating device is preferable because it can be carried out efficiently with good procedures. Alternatively, a paving machine equipped with a mixing and leveling mechanism such as a mix spaber, or a compaction mechanism in addition to these, may be equipped with a metered supply device for the powdery component () to add a predetermined amount of the powdery component () to the intermediate mixture. It is preferable that the curable mixture be added and mixed, that is, that the curable mixture can be simultaneously laid flat to a predetermined thickness, since it can be constructed economically and efficiently. In any case, it is preferable that the mixer be installed at a location where the finishing by rolling and rolling can be completed at least within about 30 minutes after the final mixture is produced.

As the heated mixing plant, a plant used for ordinary heated asphalt mixtures can be used as is.

The intermediate mixture is made by mixing predetermined amounts of heated aggregates whose aggregate particle size has been adjusted and heat-melted binder components () in a mixing device of the plant. This intermediate mixture is transported to the paving site, where a predetermined amount of the binder component () is added and mixed to the intermediate mixture immediately before paving to create a curable pavement mixture, which is then spread and finished. , the temperature of this curable paving mixture is at least 100°C immediately after addition and mixing of the binder components ().
The temperature should preferably be 120°C or higher. It is usually constructed at a temperature of approximately 140°C or higher.
This not only fuses the binder components instantly and accelerates the curing reaction, but also facilitates compaction of the mixture, which further speeds up the opening to traffic after completion of paving. This temperature (140℃) is applied if the binding material component () is cutback asphalt containing a solvent or tar-based.
Although workability is good even at lower temperatures, it is desirable to have a mixture at a temperature of about 120°C or higher in order to accelerate the curing reaction and speed up the opening to traffic after paving.

The curable pavement mixture prepared by adding and mixing the remaining components of the binder (2) to the intermediate mixture may be spread manually, but usually a finisher, mixer, or the like is used. The leveling finisher may be of similar construction to those used for leveling conventional paving asphalt mixtures, except for the mixer mounted above or directly connected thereto. Furthermore, since the mixer has its own mixing and spreading mechanism, it is preferable to equip it so that it can quantitatively disperse the components of the binder into the mixing device. Normally, a mix spaber is used to mix aggregate and asphalt emulsion and spread the mixture to a predetermined thickness, but in the present invention, an intermediate mixture is used instead of aggregate, and an asphalt emulsion is used instead of asphalt emulsion. The binder component () is used.

For the final finishing, the mixture is rolled using a commonly used road roller, except for cast-in mastic type mixtures. The mastic type uses a special finisher, but it can also be finished by hand.

As described above, the present invention produces an intermediate mixture under good control in a mixing plant that can strictly control the quality of the composition and temperature of the ingredients () of aggregates and binders, and transports this to the paving site. However, during this time, due to the action of the binder component (), the aggregates do not separate or segregate, and the intermediate mixture is delivered to the paving site as a homogeneous intermediate mixture. In addition, since the binder component () does not contain the curing components of the epoxy resin and its curing agent, it is necessary to use the intermediate mixture for the purpose of improving workability and accelerating curing after adding the binder component (). Since the temperature can be kept high, there is some leeway before paving, making the paving work easier.

Additionally, if the temperature of the intermediate mixture drops at the paving site, it can be heated to raise the temperature. Therefore, just before or during paving, a predetermined amount of the remaining binder component () is added to the intermediate mixture to create a curable mixture, and when this is laid and finished, the temperature of the curable mixture is set to the temperature of the binder. By setting the temperature to promote the fusion and hardening reactions, the paving can be opened to traffic quickly after completion of paving. Further, the binder component (2) is a uniform mixture of an epoxy resin and its curing agent at a fixed ratio, and is easy to measure and handle because it is in powder form. Therefore, when the components () and () of the binder are fused and cured, the ratio of the epoxy resin and its curing agent is always kept constant, and reaction curing can be achieved without any unreacting. Further, even if there is a slight variation in the binder component () relative to the binder component (), the physical properties of the cured product of the binder remain stable without changing much.

Next, embodiments of the present invention will be described.

Example 1 (1) Components of binder () 100 parts by weight of epoxy resin (Epicote 1004, epoxy equivalent weight 900, melting point 95°C) and aliphatic chain dicarboxylic acid (OSK-DA SL-20, molecular weight 342, melting point 120°C) ) 19 parts by weight powder.

(2) Components of binder () 70 parts by weight of straight asphalt (penetration 180) and propane deasphalt (penetration 30)
Asphalt consisting of 30 parts by weight.

(3) Aggregate “Asphalt Paving Guidelines” published by the Japan Road Association
A mixture of aggregates and fillers in the range indicated in the standard mix of fine-grained asphalt concrete (13F) by.

First, 100 kg of aggregate heated to approximately 170°C is placed in a small pug mill, and 5 kg of the binder component () heated and melted at 160°C is added and mixed to create an intermediate mixture. After leaving this intermediate mixture for about 1 hour with gentle vibration and movement, 3 kg of the binder component () was sprinkled and added to the intermediate mixture (temperature: about 150°C), mixed for about 30 seconds, and immediately thickened. The material was laid down to about 4 cm and finished by rolling it with a roller. At this time, no noticeable separation of coarse and fine aggregates was observed in the intermediate mixture due to vibration and movement. Further, the curable final mixture had low adhesion to metal, good scooping workability and rake workability, and was easy to roll with a roller. Two hours after it was laid, it reached sufficient strength and was ready for traffic. In addition, the final mixture was placed in a mold for marshal stability testing, and the mixture (its temperature was maintained at 140-145℃) was placed on one side.
Compacted the specimen with a rammer 50 times and 100 times on both sides.
After curing in an oven at 120°C for 6 hours, a Marshall stability test was conducted using a conventional method. The results are: Specific gravity 2.252, Marshall stability 5470Kg, Flow value 35
It was hot.

Example 2 (1) Components of binder () 100 parts by weight of Epicote 1004 and OSK-DA SL
-20 10 parts by weight and OSK-DA UL-20 (molecular weight
335, melting point 114°C) and 21 parts by weight of chromanindene resin (softening point 110°C).

(2) Components of binder () Asphalt made by adding 10 parts by weight of 38 heavy process oil to 90 parts by weight of straight asphalt (penetration 140) (3) Aggregate Same as Example 1.

First, 100 kg of aggregate heated to about 170°C is placed in a small pug mill, and 4.5 kg of the binder component () heated to about 150°C is added and mixed to create an intermediate mixture. 3.5 kg of the binder component (2) was added by scattering to this intermediate mixture, mixed for about 15 seconds, and immediately spread to a thickness of about 4 cm and finished by rolling with a roller. Scoop workability, rake workability, roller rolling performance, etc. were all good. After laying the floor 2
After several hours, sufficient strength was reached and traffic could be opened. The final mixture was subjected to the Marshall stability test in the same manner as in Example 1, but the specific gravity
The results were 2.248, stability 5600Kg, and flow value 35.

Example 3 (1) Components of binder () Same as Example 1.

(2) Components of the binder () Consists of 95 parts by weight of straight asphalt (penetration 80) containing 2% chloroprene rubber and 5 parts by weight of 38 heavy process oil.

(3) Aggregate Same as Example 1.

Put 100 kg of aggregate heated to about 170°C into a small pug mill, add and mix 6 kg of the binder component () heated to about 150°C to create an intermediate mixture. Sprinkle 2 kg of the binder component () into this intermediate mixture (temperature of about 150°C), add and mix for about 15 seconds,
Immediately lay it out to a thickness of about 5 cm and finish by rolling it with a roller. Scoop workability, rake workability, and roller compaction were all good. Two hours after completion of compaction, sufficient strength was reached and it became possible to open to traffic. The final mixture was subjected to a marshal stability test in the same manner as in Example 1, and the results were that the specific gravity was 2.273, the marshal stability was 2950 kg, and the flow value was 32.

Example 4 (1) Components of binder () 100 parts by weight of Epicote 1004 and OSK-DA SL
−20 19 parts by weight and coal tar pitch (softening point
The powder was mixed and ground into a proportion of 10 parts by weight (95℃) and 21 parts by weight of coumaron indene resin (softening point 105℃).

(2) Components of binder () Anhydrous coal tar containing 2% acrylonitrile rubber (3) Aggregate Same as Example 1.

Approximately 140 ℃ of aggregate heated to approximately 150℃ in a small pug mill
Add and mix 4.8 kg of the binder ingredients () heated to ℃ to create an intermediate mixture. This intermediate mixture (temperature
Add 2.7 kg of the binder component (135°C) by scattering and mixing for about 15 seconds. Immediately spread it to a thickness of about 4 cm and then finish by rolling it with a roller. Scoop workability, rake workability, roller rolling performance, etc. were all good. Four hours after completion of compaction, sufficient strength was reached and it was possible to open to traffic. This pavement has particularly excellent oil resistance.

The construction method according to the present invention can be widely used for paving general roads, bridges, airports, parking lots, grounds, factory paving, building floors, etc. It is particularly effective for paving areas where it is difficult to block traffic for long periods of time.

Claims (1)

[Claims] 1 Powdered component () containing an epoxy resin with a melting point of 60°C or higher and an epoxy resin curing agent consisting of an aliphatic chain dicarboxylic acid having 12 to 28 carbon atoms.
The paving method uses a heat-reactive epoxy bituminous binder consisting of two compositions: and a bituminous component (), and aggregates, and the aggregates and the bituminous component ( ) to produce an intermediate mixture, transport the intermediate mixture to the paving site, and immediately before paving, add and mix a predetermined amount of the powdered component () to the intermediate mixture to produce a heated epoxy bituminous mixture; A method of constructing heated epoxy bituminous pavement, which is characterized by laying and finishing it to a predetermined thickness.