JP2022154988A - Pavement repair material and pavement repair material manufacturing method - Google Patents

Abstract

To provide a pavement repair material capable of easily adjusting a hardening time of the pavement repair material without using gypsum and securing a pot life of the pavement repair material without causing poor mixing while using an inexpensive and easily available emulsion, and a method for manufacturing the same.SOLUTION: A pavement repair material contains: cement; a cation asphalt emulsion; and a mixed adjustment material that suppresses the asphalt emulsion from being decomposed by cement. The cement consists of normal Portland cement and ultra-rapid hardening cement. A ratio of normal Portland cement and ultra-rapid hardening cement is 20 to 80:80 to 20.SELECTED DRAWING: Figure 1

Description

Embodiments of the present invention relate to pavement repair materials and methods of making pavement repair materials.

Pavement repair materials are used, for example, as surface renewal materials for roads, step correction materials, hole-filling repair materials, and the like. This pavement repair material is usually produced by mixing aggregate, cement, resin, asphalt emulsion, water, and the like. As the asphalt emulsion, for example, a nonionic asphalt emulsion that is stable and resistant to decomposition even when mixed with cement is used.

These pavement materials harden due to the hydration reaction of cement, but the hardening speed is slow and the hardening time required for pavement repair materials to harden to the desired strength (strength required for reopening traffic) is long. It takes time to In order to resume traffic at an early stage, there is a demand for shortening the curing time required for the pavement repair material to harden to a desired strength.

On the other hand, if the hardening time of the pavement repair material becomes too short, the pot life of the pavement repair material will be shortened, making it difficult to secure working hours for paving work. For this reason, it is required to shorten the curing time for the pavement repair material to harden to a desired strength while securing the pot life of the pavement repair material.

Here, in Patent Document 1 shown below, cement and gypsum are used as binders constituting the pavement repair material in adjusting the hardening time. That is, while cement takes a long time to harden, gypsum takes a short time to harden, and the hardening time is adjusted by utilizing the properties of each.

Patent No. 6813935

However, when gypsum is used as the binder, it is conceivable that, depending on the circumstances, it may cause problems such as cracking or discoloration after hardening.

In the present invention, it is possible to easily adjust the curing time of the pavement repair material without using gypsum, and to repair the pavement without causing poor mixing while using an inexpensive and easily available emulsion. It is an object of the present invention to provide a pavement repair material and a method for producing the same that can ensure the usable life of the material.

The pavement repair material according to the embodiment of the present invention contains cement, a cationic asphalt emulsion, and a mixed adjustment material that suppresses decomposition of the asphalt emulsion by cement. It consists of hard cement, and the ratio of ordinary Portland cement and ultra-rapid hardening cement is 20-80:80-20.

Also, the ratio of the asphalt emulsion and the mixed adjustment material is characterized by being 60-40:40-60.

Further, the pavement repair material may contain aggregate.

When the pavement repair material contains an aggregate, the content of the aggregate may be 50 to 85% by weight based on the total weight of the aggregate, cement, asphalt emulsion and mixed conditioning material.

A method for producing a pavement repair material according to an embodiment of the present invention includes a step of mixing a cationic asphalt emulsion and a mixed adjustment material that suppresses decomposition of the asphalt emulsion by cement; and a step of mixing cement with the mixed material.

In the method of manufacturing the pavement repair material, when the aggregate is mixed with the pavement repair material, the material used as the aggregate may be mixed and then mixed with the mixed material.

In the case of mixing the aggregate with the pavement repair material, the mixture may be mixed with the cement, and then mixed with the material to be used as the aggregate.

Thus, with the pavement repair material according to the embodiment of the present invention, the hardening time of the pavement repair material can be easily adjusted without using gypsum, and the emulsion is inexpensive and readily available. It is possible to secure the pot life of the pavement repair material without causing poor mixing even when using

In addition, according to the method for producing a pavement repair material according to the embodiment of the present invention, it is possible to easily reduce the curing time of the pavement repair material without causing poor mixing while using an inexpensive and easily available emulsion. Adjustments can be made, and the pot life of the pavement repair material can be ensured.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure for demonstrating an example of the mix|blending of the material for pavement repair which concerns on embodiment of this invention. FIG. 4 is a diagram illustrating cement blending in the pavement repair material according to the embodiment of the present invention. FIG. 4 is a diagram illustrating the blending of the asphalt emulsion and the mixed adjustment material in the pavement repair material according to the embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a flowchart which shows the flow of the manufacturing method of the pavement repair material which concerns on embodiment of this invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the embodiment described below shows an example of the present invention. In addition, various modifications or improvements can be added to the present embodiment, and the embodiments to which such modifications or improvements are added can also be included in the present invention. This embodiment and its modifications are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and its equivalents.

The formulation of the pavement repair material according to the embodiment of the present invention will be described with reference to FIG. FIG. 1 is a diagram for explaining an example of formulation of a pavement repair material according to an embodiment of the present invention.

The pavement repair material in the embodiment of the present invention shown in Fig. 1 is produced by mixing at least "cement", "asphalt emulsion" and "mixed adjustment material". As shown in FIG. 1, the name of each material constituting the pavement repair material is listed vertically. On the other hand, numbers from 1 to 4 are assigned to the sides, and the formulations corresponding to the scenes in which the pavement repair material is used are shown. In the following, according to these numerals, they are referred to as "Formulation Example 1", "Formulation Example 2", "Formulation Example 3", and "Formulation Example 4" in order from the left.

Here, the pavement repair material is a repair material used for maintaining the service condition of pavement on roads and the like. As cases where the pavement repair material is used, there are roughly the following four cases.

The first is when used to refresh pavement surfaces, such as smoothing aged pavement surfaces. In this case Formulation Example 1 is used (surface renewal material 1). The second case is a case where the pavement surface is refreshed as in the first case, but in this case it is assumed that the pavement surface is rougher than in the first case. In this case Formulation Example 2 is used (surface renewal material 2).

The third type is to fill a dent to reduce a step, which is used when the rubbing of a step is minor, and in this case, Formulation Example 3 is used (step correction material). The fourth is when it is used to fill holes in the pavement. In this case, Formulation Example 4 is used (hole-filling repair material).

FIG. 1 shows the blending ratios (content ratios) of all the materials constituting each of Blending Examples 1 to 4, and is merely an example of blending. This compounding ratio is indicated by weight % (wt %) indicating how much weight is contained with respect to a certain total weight (100% by weight), that is, the weight ratio.

The cement used in the pavement repair material according to the embodiment of the present invention is a mixture of ordinary Portland cement and ultra fast hardening cement. It is preferable that the curing time of the pavement repair material can be appropriately adjusted depending on the usage conditions, environment, and the like. Here, general cement has the property of having a long hardening time, but if gypsum is used to adjust the hardening time, the above-mentioned problems may occur.

Therefore, in the pavement repair material according to the embodiment of the present invention, while using ordinary Portland cement as cement, the hardening time can be adjusted as necessary by mixing the ordinary Portland cement with a certain amount of ultra-rapid hardening cement. It is configured as follows.

Taking Mixing Example 1 shown in FIG. %. That is, the mixing ratio of ordinary Portland cement and ultra-rapid hardening cement is 20:80. In addition, in each mixing example in FIG. 1, the mixing ratio of ordinary Portland cement and ultra-rapid-hardening cement is set to this mixing ratio.

However, the mixing ratio of ordinary Portland cement and ultra-rapid hardening cement is not limited to the above ratio. FIG. 2 is a diagram illustrating the blending of cement in the pavement repair material according to the embodiment of the present invention.

In FIG. 2, the names of "ordinary portland cement" and "ultra-rapid hardening cement" are written vertically at the left end, and the item "property of mixture" is provided at the bottom. This shows the hardening time of the pavement repair material prepared by mixing the ordinary Portland cement and the ultra-rapid hardening cement at different ratios based on the mixing ratio in Formulation Example 1.

Looking at the item of "ordinary Portland cement" to the right, there are four mixing ratios of "80 or more", "80", "20" and "less than 20" in order. ” is set to “less than 20”, “20”, “80” and “80 or more” in order according to the ratio of “ordinary Portland cement”.

The properties of the mixture obtained by mixing ordinary Portland cement and ultra-rapid hardening cement based on these four blending ratios are indicated by "O" and "X". Here, "O" indicates a case where the curing time is appropriate when used as a pavement repair material, and "X" indicates an unsuitable case.

As shown in FIG. 2, the mixing ratio (ratio) of ordinary Portland cement and ultra-rapid hardening cement is preferably 20-80:80-20, respectively. Therefore, the property of the mixture is "O".

On the other hand, if the mixing ratio of ordinary Portland cement and ultra-rapid hardening cement is 80 or more and less than 20, the hardening time will be too long. On the contrary, if the mixing ratio of ordinary Portland cement to ultra-rapid hardening cement is less than 20:80 or more, the hardening time is too short, and it can be said that it is inappropriate ("x") anyway.

As described above, the preferred mixing ratio of ordinary Portland cement and ultra-rapid hardening cement is in the range of 20-80:80-20. However, if the ratio of ordinary Portland cement is close to 80 (the ratio of ultra-rapid hardening cement is close to 20), the hardening time will be long. On the other hand, when the proportion of ordinary Portland cement is close to 20 (the proportion of ultra-rapid hardening cement is close to 80), the hardening time is rather short.

Asphalt emulsions are produced by dispersing finely divided asphalt in water containing an emulsifier to reduce the apparent viscosity (emulsification). There are three types of asphalt emulsion, anionic, cationic, and nonionic, depending on the state of electrification of the asphalt particles.

Among these, nonionic and cationic are conventionally used for pavement. In particular, nonionic emulsions have no electric charge and are nearly neutral, so they are less likely to be affected by ions, are less likely to be decomposed even when mixed with cement or the like, and are stable, and are used as modified emulsions. In addition, since it can be easily mixed with cement, which is an alkali, it is also used as an emulsion for roadbed regeneration methods and cement emulsion mortar.

Cationic emulsions, on the other hand, are excellent in stability, decompose quickly after use, form an asphalt film on the surface of the aggregate, and decompose and harden without the need for water to evaporate, making them suitable for pavement materials. . In addition, the cationic asphalt emulsion has a market environment of price (cheap), production volume (large), availability (sold at plants: easy), and expiration date (long).

Since the cationic asphalt emulsion is acidic, it reacts and decomposes when mixed with alkaline cement or the like. Therefore, if the resin, which is a mixing adjustment material described later, is not added, poor mixing occurs. However, in other words, this decomposition can be suppressed by adding resin.

Therefore, in the embodiment of the present invention, a cationic asphalt emulsion is used in view of the various conditions described above. As the cationic asphalt emulsion in the embodiment of the present invention, for example, emulsions such as PK-3 and PK-4 can be preferably used.

In addition, the pavement repair material according to the embodiment of the present invention is produced using only water contained in the asphalt emulsion and the mixed adjustment material described later, and is produced without adding water to the material. Therefore, for example, the above-mentioned additive liquid consisting of cationic asphalt emulsion and water is not used.

The mixing adjustment material suppresses decomposition of the cationic asphalt emulsion by cement when mixing the materials. That is, the cationic asphalt emulsion is difficult to mix with other materials that make up the pavement repair material and may cause poor mixing. do.

Examples of the mixed adjustment material include resin. In the pavement repair material according to the embodiment of the present invention, for example, an emulsion resin, which is a liquid resin, is used. By using such a resin, mixing with other materials can be performed more smoothly.

As for the mixing ratio of the asphalt emulsion and the resin, it can be suitably used as a pavement repairing material when mixed at the following ratios. FIG. 3 is a diagram illustrating the blending of the asphalt emulsion and the mixed adjustment material in the pavement repair material according to the embodiment of the present invention.

In FIG. 3, the names of "asphalt emulsion" and "resin" are written vertically at the left end, and the item "property of mixture" is provided at the bottom. This "property of mixture" indicates the properties of the pavement repair material when the resin and the asphalt emulsion are mixed on the premise of the mixing ratio in Formulation Example 1.

Looking at the item of "asphalt emulsion" to the right, there are four mixing ratios of "less than 40", "40", "60" and "60 or more" in order, while "resin" , "60 or more", "60", "40" and "less than 40" in order according to the ratio of the above "asphalt emulsion".

Looking at the properties of the mixture obtained by mixing the asphalt emulsion and the resin based on these four blending ratios, the properties are indicated by "o" and "x". Here, "◯" indicates a case of being suitable for use as a pavement repair material, and "X" indicates a case of being unsuitable.

If the mixing ratio of the asphalt emulsion and the resin is less than 40:60 or more, the mixture tends to be wet. On the contrary, when the blending ratio of the asphalt emulsion and the resin is 60 or more: less than 40, the properties of the mixture become dry and somewhat dry, and it can be said to be inappropriate (“x”).

On the other hand, as shown in FIG. 3, the mixing ratio (ratio) of the asphalt emulsion and the resin is preferably 40-60:60-40, respectively. Therefore, the property of the mixture is "O", which means that the mixture is neither wet nor dry, and is mixed in an appropriate state.

As mentioned above, the preferred mixing ratio of the asphalt emulsion and the resin is in the range of 40-60:60-40. However, if the ratio of the asphalt emulsion is less than 40 (the ratio of the resin is close to 60 or more) even within the range of mixing in a moderate state, the state is close to wet. On the other hand, when the ratio of the asphalt emulsion is 60 or more (the ratio of the resin is close to less than 40), the condition is close to dry. Which state to use is selected by appropriately setting the ratio of the asphalt emulsion and the resin according to the usage conditions.

As shown in FIG. 1, in Formulation Example 1, which is Surface Renewal Material 1 used for pavement surface refreshment, the pavement repair material is composed of cement blended with ordinary Portland cement and ultra-fast hardening cement, and cationic cement. There are only three types: asphalt emulsion and resin, which is a mixed conditioning material. The blending ratios shown in FIG. 1 are only examples, but cement is 35% by weight (ordinary Portland cement 7.0% by weight, ultra-rapid hardening cement 28.0% by weight), asphalt emulsion is 26% by weight, and resin is 39% by weight. is.

On the other hand, in the case of Formulation Example 2, which is Surface Renewal Material 2, which is also used to refresh the pavement surface, aggregate is added. Here, in an embodiment of the invention, dry aggregate is used. Aggregates therefore include unwetted crushed stone and sand. Also, other materials may be used as the material of the aggregate, for example, recycled asphalt aggregate, crushed stone and sand may be used, or only sand may be used.

As shown in FIG. 1, "Rc2.5-0" is used as the aggregate in this case, and is contained in the pavement repair material at a rate of 60% by weight. In addition, the proportions of cement, asphalt emulsion and resin are 14% by weight (2.8% by weight for ordinary Portland cement and 11.2% by weight for ultra-rapid hardening cement), 10.4% by weight and 15.6% by weight, respectively.

In the case of Formulation Example 3, which is a step correction material used for rubbing a step, the respective mixing ratios of aggregates and the like are the same as in Formulation Example 2, but "Rc2.5-0" and "Rc5-2.5" are used as aggregates. ” are mixed. The respective mixing ratios are 42.0% by weight for the former and 18.0% by weight for the latter.

Mixing Example 4 shows the mixing ratio when the pavement repair material is used with the hole-filling repair material, and various materials are mixed. That is, like Formulation Examples 2 and 3, it contains cement, resin, asphalt emulsion and aggregate, and further contains synthetic rubber latex and fiber.

Regarding the aggregates, in Formulation Examples 2 and 3, "Rc2.5-0" and "Rc5-2.5" were used, but in Formulation Example 4, these were not used, and "coarse aggregate", "Fine aggregate" and "filler" are used. The blending ratio of the entire aggregate in Blending Example 4 is 77.7% by weight, and the breakdown is 38.1% by weight for "coarse aggregate", 22.4% by weight for "fine aggregate", and 22.4% by weight for "filler". is 17.2% by weight.

In addition, since the blending ratio of the aggregate is as described above, the blending ratio of cement and the like in the pavement repair material is lower than in Blending Examples 1 to 3. For example, the cement contains ordinary Portland cement, ultra-rapid hardening cement, and an expansion agent, and the total amount is 5.1% by weight. .5% by weight.

In addition, in this mixing example 4 as well, the mixing ratio of ordinary Portland cement and ultra-rapid hardening cement is approximately 20:80 as described above. In addition, expansion agents contained in cement are so-called admixtures that are added as necessary to impart special properties to concrete or the like.

The blending ratios of the asphalt emulsion and the resin are 6.0% by weight and 9.0% by weight, and the blending ratio between the two is 40:60 as in the other blending examples. In addition, Formulation Example 4 contains 2.1% by weight of synthetic rubber latex and 0.1% by weight of fiber.

Therefore, including any of Formulation Examples 1 to 4, the aggregate is 50 to 85% of the total weight of the pavement repair material, such as aggregate, cement, asphalt emulsion, and mixed adjustment material. It is contained in the range of % by weight.

Next, a method for manufacturing a pavement repair material according to an embodiment of the present invention will be described with reference to FIG. FIG. 4 is a flow chart showing the flow of the method for manufacturing the pavement repair material according to the embodiment of the present invention.

First, the case of Formulation Example 1 in which only "cement", "resin" and "asphalt emulsion" are blended will be described. In producing the pavement repair material, a method of mixing all the materials regardless of the order is also conceivable. Asphalt emulsion and resin are mixed (ST1).

That is, in the pavement repair material according to the embodiment of the present invention, the cationic asphalt emulsion as described above is used as the asphalt emulsion. Since this cationic asphalt emulsion is positively charged, when it is mixed with negatively charged cement, it reacts quickly and starts to solidify. Therefore, before mixing the asphalt emulsion with the cement, the resin and the asphalt emulsion are first mixed (hereinafter, the product produced by such mixing is appropriately referred to as the "mixed material").

After the resin and asphalt emulsion have been completely mixed, these mixed materials are mixed with cement (ST2). In the embodiment of the present invention, a mixture of ordinary Portland cement and ultra-rapid hardening cement is used as the cement. Therefore, these two types may be mixed in advance and then mixed with the mixed material, or the ordinary Portland cement, the ultra-fast hardening cement and the mixed material may be mixed at once.

The order of mixing is the same when aggregates, synthetic rubber latex, or fibers are mixed to produce a pavement repair material. In FIG. 4, reference numeral 10A indicates the case where aggregates and the like are mixed before mixing the resin and the asphalt emulsion. On the other hand, reference numeral 10B indicates the case where the resin and the asphalt emulsion are mixed, and after the mixed material is mixed with cement, the aggregate and the like are mixed.

That is, in the production of the pavement repair material, regardless of whether or not aggregates are mixed, the order of mixing cement with the mixed material of resin and asphalt emulsion is the basic order. When the aggregate and the like are mixed, they are mixed either before mixing the resin and the asphalt emulsion (reference numeral 10A) or after mixing the cement (reference numeral 10B).

As described above, the pavement repair material in the embodiment of the present invention contains cement, a cationic asphalt emulsion and a resin, and the cement consists of ordinary Portland cement and ultra-fast hardening cement. The ratio of hard cement comprises a composition of 20-80:80-20.

By adopting such a configuration, it is possible to easily adjust the curing time of the pavement repair material without using gypsum, and even though an inexpensive and easily available emulsion is used, poor mixing occurs. It is possible to provide a pavement repair material and a method for producing the same that can ensure the usable life of the pavement repair material without causing deterioration.

That is, as described above, as the cement constituting the pavement repair material, not only ordinary Portland cement, but also a mixture of ultra-fast hardening cement is used, thereby hardening the pavement repair material without using gypsum. You can easily adjust the time.

In any of the pavement repair materials described above, the decomposition of the cationic asphalt emulsion is suppressed by the resin contained in the pavement repair material. This makes it possible to use an inexpensive and easily available cationic asphalt emulsion, and shorten the curing time (improve the curing speed) for the pavement repair material to cure to the desired strength. .

Also, in the above description, an emulsion containing resin and water is added to each material, but the present invention is not limited to this, and resin powder may be added, for example. For example, when mixing aggregates in the production of pavement repair materials, even if the aggregates are in a wet state, by selecting powder resin instead of emulsion resin as the resin to be used, the water content during mixing can be reduced. can be adjusted. That is, a resin can be selected according to the state of the aggregate to be used.

Further, in the above description, the use of resin as the mixing adjustment material is exemplified, but the present invention is not limited to this, and for example, a synthetic polymer compound may be used as the mixing adjustment material. That is, for example, a resin, a synthetic polymer compound, or the like is used as the mixed adjustment material.

1... Formulation example 1 (Surface renewal material 1)
2: Formulation example 2 (surface renewal material 2)
3 ... Formulation example 3 (level difference correction material)
4 ... Formulation example 4 (hole-filling repair material)

The pavement repair material according to the embodiment of the present invention contains cement, a cationic asphalt emulsion, and a mixed adjustment material that suppresses decomposition of the asphalt emulsion by cement. It consists of hard cement, and the ratio of ordinary Portland cement and ultra-rapid hardening cement is 20-80:80-20, and the ratio of asphalt emulsion and mixed adjustment material is 60-40:40-60. do.

A method for producing a pavement repair material according to an embodiment of the present invention includes a step of mixing a cationic asphalt emulsion and a mixed adjustment material that suppresses decomposition of the asphalt emulsion by cement; and mixing cement into the mixed material with , the cement consists of ordinary Portland cement and ultra-rapid hardening cement, the ratio of ordinary Portland cement and ultra-rapid hardening cement is 20 to 80:80 to 20, and asphalt The ratio of the emulsion and the mixed adjustment material is characterized by 60-40:40-60 .

Claims (7)

cement;
a cationic asphalt emulsion;
a mixing adjustment material that suppresses the decomposition of the asphalt emulsion by the cement;
The pavement repair material, wherein the cement comprises ordinary Portland cement and ultra-rapid hardening cement, and the ratio of ordinary Portland cement and ultra-rapid-hardening cement is 20-80:80-20. The pavement repair material according to claim 1, wherein the ratio of said asphalt emulsion and said mixed adjustment material is 60-40:40-60. 3. The pavement repair material according to claim 1, wherein the pavement repair material contains aggregate. The pavement repair according to claim 3, wherein the content of the aggregate is 50 to 85% by weight with respect to the total weight of the aggregate, the cement, the asphalt emulsion and the mixed adjustment material. material. A step of mixing a cationic asphalt emulsion with a mixing adjustment material that suppresses decomposition of the asphalt emulsion by cement;
a step of mixing the cement with a mixture of the asphalt emulsion and the mixed adjustment material;
A method for producing a pavement repair material, comprising: 6. The production of the pavement repair material according to claim 5, wherein when the aggregate is mixed with the pavement repair material, the material to be used as the aggregate is mixed and then mixed with the mixed material. Method. 6. The method according to claim 5, wherein when the aggregate is mixed with the pavement repair material, the material used as the aggregate is mixed with the cement after mixing the mixed material and the cement. A method for producing a pavement repair material.

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