KR102562854B1 - Ascon repavement layer having asphalt adhesion layer - Google Patents

Abstract

An asphalt resurfacing layer containing an asphalt emulsion composition that maintains the adhesion of the base layer and the surface layer, prevents neutralization of the base layer and the surface layer, and strengthens the surface. The resurfacing layer includes an asphalt concrete bonding layer filled inside the repair groove for resurfacing and located between the base layer and the surface layer, and the asphalt bonding layer contains an emulsion layer dispersed in a solution including asphalt fine particles, an emulsifier and a stabilizer. The emulsion layer contains porous pottery, and the porous pottery contains a plurality of pores and contains 1 to 5% by weight based on the total weight of the bonding layer.

Description

Ascon repavement layer having asphalt adhesion layer}

The present invention relates to an asphalt concrete resurfacing layer, and more particularly, to an asphalt concrete resurfacing layer including an asphalt bonding layer that ensures sufficient reinforcement and waterproofing for asphalt concrete resurfacing.

In general, a paved road is formed by sequentially stacking a surface layer, a base layer, and a road bed from the top, and the surface layer and the base layer are paved and compacted by heating or mixing asphalt and aggregate or filler at room temperature. The asphalt concrete is a mixture of asphalt and concrete, and includes room temperature asphalt, recycled asphalt, HMA (hot mix asphalt), and the like, in addition to the heated asphalt mixture (KS F 2349 standard). Since paved roads are damaged due to vehicle traffic, climate and environmental changes, repavement is being carried out with partial repair at an appropriate time. Since the life cycle of paved roads varies depending on maintenance, the appropriate time and construction method are selected for resurfacing.

According to the KCS 44 50 10:2016 standard specification for asphalt concrete pavement work published by the Ministry of Land, Infrastructure and Transport, the asphalt concrete resurfacing process is as follows. First, after locally crushing and cleaning the asphalt concrete to be resurfaced, it is applied with an asphalt emulsion and cured for a certain period of time. Asphalt emulsion improves adhesion between the base layer and the surface layer, and prevents penetration of moisture or foreign substances into the base layer. The emulsion imparts waterproof characteristics, improves binding force, and enhances the strength of the pavement. As such, since the asphalt emulsion has a great influence on the life of the road, it is variously suggested in Korean Patent Registration No. 10-2334291 and the like.

However, asphalt emulsion deteriorates over time and fine cracks occur. Specifically, when moisture penetrates into the emulsion after construction, the moisture is heated by sunlight and becomes water vapor, which does not evaporate and stays in the gap, increasing the vapor pressure. When the vapor pressure increases, a swelling phenomenon that is pushed up by the vapor pressure occurs in the gap. When swelling occurs, the adhesion of the emulsion decreases. In addition, the emulsion needs to prevent neutralization of the components of the base layer and the surface layer, and to strengthen the surface of the surface layer and the base layer.

The problem to be solved by the present invention is to provide an asphalt concrete resurfacing layer including an asphalt bonding layer that maintains the adhesion of the base layer and the surface layer, prevents neutralization of the base layer and the surface layer, and strengthens the surface.

Ascon resurfacing layer including an asphalt bonding layer for solving the problems of the present invention includes an asphalt bonding layer filled inside a repair groove for resurfacing and positioned between a base layer and a surface layer. At this time, the asphalt bonding layer includes an emulsion layer dispersed in a solution including asphalt fine particles, an emulsifier and a stabilizer, and includes a pottery porous body, and the pottery porous body includes a plurality of pores and 1 with respect to the total weight of the bonding layer ~5% by weight.

In the repacking layer of the present invention, the porous pottery body includes porous silicon carbide powder, and the silicon carbide powder may be contained in an amount of 5 to 50% by weight based on the total weight of the porous pottery body. The bonding layer may include 1 to 5% by weight of the potassium titanate porous body including a plurality of pores. The bonding layer may include a surface reinforcing agent. The surface reinforcing agent may be an inorganic reinforcing agent including an alkali silicate. The bonding layer may include a plate-shaped ceramic forming at least one layer while forming an air gap (G). The plate-shaped ceramics may be disposed parallel to each other, inclined, or combined with each other.

In an embodiment of the present invention, the asphalt bonding layer is divided into a lower layer, a porous layer and an upper layer, the lower layer and the upper layer contain a surface reinforcing agent, and the porous layer is filled in the space provided by the buffer grid. Porous bodies may be included. The asphalt bonding layer is divided into a lower layer, a porous layer and an upper layer, the lower layer and the upper layer contain a surface reinforcing agent, and the porous layer is filled with the potassium titanate porous body filled in the space provided by the buffer grid. Can include. The asphalt bonding layer is divided into a lower layer, a porous layer and an upper layer, and the lower layer and the upper layer may include a surface hardening agent and plate-shaped ceramic.

According to the asphalt concrete resurfacing layer including the asphalt bonding layer of the present invention, by mixing a breathable porous body such as a pottery porous body with the asphalt bonding layer, the adhesion of the base layer and the surface layer is maintained, neutralization of the base layer and surface layer components is prevented, and the surface strengthened

1 is a cross-sectional view for explaining a first resurfacing layer according to the present invention.
FIG. 2 are photographs showing a potassium titanate porous body applied to the first resurfacing layer of FIG. 1 .
3 is a cross-sectional view for explaining a second resurfacing layer according to the present invention.
4 is a cross-sectional view for explaining a third bonding layer according to the present invention.
5 is a cross-sectional view for explaining a fourth bonding layer according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below may be modified in many different forms, and the scope of the present invention is not limited to the embodiments described below. The embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art. Meanwhile, in the drawings, the thicknesses of films (layers, patterns) and regions may be exaggerated for clarity. Further, when it is said that a film (layer, pattern) is on, above, below, or on one side of another film (layer, pattern), it may be directly formed on the other film (layer, pattern) or other films (layer, pattern) may be formed therebetween. A film (layer, pattern) may be interposed.

An embodiment of the present invention maintains adhesion by mixing an air permeable porous body such as a pottery porous body with an asphalt bonding layer, prevents neutralization of base layer and surface layer components, Ascon including an asphalt bonding layer in which the surface of the surface layer and base layer is strengthened presents a resurfacing layer. To this end, the asphalt bonding layer to which the air permeable porous body is applied will be studied in detail, and the improvement effect of the bonding layer by the air permeable porous body will be described in detail. The asphalt bonding layer of the present invention is applied to various paved roads using asphalt concrete.

1 is a cross-sectional view for explaining a first resurfacing layer 100 according to an embodiment of the present invention. However, it is not a drawing in a strict sense, and there may be components not shown in the drawing for convenience of description.

Referring to FIG. 1 , the first resurfacing layer 100 includes a repair groove 10, a base layer 11, a first bonding layer 20, and a surface layer 12. The first resurfacing layer 100 is filled inside the repair groove 10 from which a part of the existing asphalt concrete layer is removed. The repair groove 10 is a part artificially removed in order to re-pave the damaged part of the road pavement. The existing asphalt layer and the first resurfacing layer 100 are laminated on the subgrade. Of course, in addition to the existing asphalt concrete layer and the subgrade, a layer implementing various functions, such as a drainage layer, may be added within the scope of the present invention. The base layer 11 is on the subgrade, and uniformly transfers the load acting on the surface layer 12 to the subgrade by correcting the surface. The surface layer 12 has appropriate slip resistance and flatness to enable safe and comfortable driving in addition to the role of distributing the load to the lower part.

The base layer 11 and the surface layer 12 are paved and compacted by heating or mixing asphalt and aggregate or filler at room temperature. Ascon, which is a mixture of asphalt and concrete, is mainly used for the surface layer 12, and in addition to the heated asphalt mixture (KS F 2349 standard), there are room temperature asphalt, recycled asphalt, HMA (hot asphalt mix), and the like. The condition of the asphalt concrete greatly changes according to the temperature change, and the asphalt road pavement also has a severe behavioral change according to the temperature change. Specifically, in the asphalt concrete, plastic deformation occurs due to ductility in a high-temperature environment in summer, and cracks due to brittleness occur in a low-temperature environment in winter. Fatigue cracking of asphalt pavement has many factors, such as the combination of road pavement structure, the properties of binders such as asphalt and aggregate, the physical properties and porosity of aggregate, the substructure of road pavement, and the amount of traffic.

The first bonding layer 20 improves adhesion between the base layer 11 and the surface layer 12 of the road pavement, and prevents moisture or foreign substances from penetrating into the base layer 11 to impart waterproof characteristics. The first bonding layer 20 improves the strength of the road pavement by improving the binding force between the base layer 11 and the surface layer 12. like this. Application of the first bonding layer 20 has a great influence on road life. The first bonding layer 20 includes an emulsion layer 21 in which asphalt fine particles are dispersed in an emulsifier, a stabilizer, etc. 23) may be further included. Any known emulsion layer 21 may be applied without limitation.

The pottery pottery body 22 increases bonding strength with the first bonding layer 20 and improves air permeability and thermal insulation properties of the first bonding layer 20 . The pottery porous body 22 is mainly manufactured by firing clay. Clay refers to fine soil particles having a diameter of 0.004 mm or less. When rocks are weathered and decomposed, clay minerals are formed by combining mainly silicon, aluminum, and water. Clay has a much larger surface area per unit weight than sand or silt, so it is the most active part of soil along with humus and has a strong ability to retain moisture and nutrients. The pottery pottery body 22 is harmless to the human body, non-toxic, and can be used for a long time. In addition, the porous pottery body 22 maintains excellent environmental resistance in a natural state and is inexpensive to produce. Furthermore, the fine pores generated in the process of manufacturing the porous pottery body 22 retain the function of a natural filter that allows air to pass through and blocks water.

In order to control the apparent density of the pottery porous body 22, silicon carbide (SiC) powder is mixed. The silicon carbide powder exists in a form included in the porous pottery body 22, and in the process of manufacturing the porous pottery body 22, a chemical reaction is caused by atmospheric gas and heat to generate gas. For example, the silicon carbide powder is converted into a porous body while generating an oxygen compound by reacting with oxygen by heat. Here, the oxygen compound may be CO ₂ , and CO ₂ serves to control the apparent density (AD) of Onggi. Apparent density is expressed in units of g/cc and refers to mass per unit volume. The apparent density varies depending on the number of pores included in the pottery porous body 22 and the size of the pores, and the larger the relative volume occupied by the pores, the smaller the apparent density.

The content of the porous pottery body 22 is preferably 1 to 5% by weight with respect to the total weight of the first bonding layer 20 in consideration of the dispersibility, air permeability, and heat insulation of the porous pottery body 22 . If the content of the pottery porous body 22 is less than 1% by weight, the effect of air permeability and heat insulation is reduced, and if the content exceeds 5% by weight, the effect of the first bonding layer 20 is reduced because the components of the emulsion layer are reduced. In addition, the content of the silicon carbide powder in the porous pottery body 22 is 5 to 50% by weight based on the weight of the porous pottery body 22 . When the content of silicon carbide powder, which is a porous body, in the porous pottery body 22 is increased, the apparent density of the porous pottery body 22 is lowered. As the content of the silicon carbide powder increases, the number of pores relatively increases and the size of the pores also increases. In this way, the silicon carbide powder can adjust the air permeability by controlling the number and size of the pores of the pottery porous body 22 .

Optionally, the first bonding layer 20 may further include a potassium titanate porous body 23 . The potassium titanate porous body 23 increases the bonding strength of the first bonding layer 20 and improves air permeability and heat insulating properties of the first bonding layer 20 . As shown in FIG. 2, the potassium titanate porous body 23 is obtained by sintering fibers (a) and powder (b), and each has pores (Vg). The porosity of the potassium titanate porous body 23 can be adjusted by a known method. The potassium titanate porous body 23 not only has excellent mechanical performance, but also has unique physicochemical properties due to its own tunnel structure. For example, there are high infrared reflectance, low thermal conductivity, heat insulation, high heat resistance, high abrasion resistance, high electrical insulation and low dielectric constant, chemical stability, and the like.

The content of the potassium titanate porous body 23 is preferably 1 to 5% by weight with respect to the total weight of the first bonding layer 20 in consideration of dispersibility, air permeability, and heat insulating properties of the potassium titanate porous body 23 . If the content of the potassium titanate porous body 23 is less than 1% by weight, the effect of air permeability and heat insulation is reduced, and if it exceeds 5% by weight, the effect of the first bonding layer 20 is reduced because the components of the emulsion layer are reduced.

The pottery porous body 22 and the potassium titanate porous body 23 contain moisture and gradually evaporate it to prevent deterioration due to moisture. In addition, the pores of the pottery porous body 22 and the potassium titanate porous body 23 impart heat insulating properties. The pores connected in the form of a three-dimensional network absorb moisture and air to lower the thermal conductivity of the first bonding layer 20 . The insulating properties of the porous bodies 22 and 23 reduce rapid temperature changes in the first bonding layer 20 and suppress contraction and expansion of the first bonding layer 20 . That is, the porous bodies 22 and 23 contribute to effectively preventing cracks of the first bonding layer 20 by gradually evaporating moisture and suppressing rapid temperature changes.

On the other hand, when the thickness of the first bonding layer 20 is large, solidification of the first bonding layer 20 does not occur properly in some regions, particularly in the center. In this case, since the solidification of the first bonding layer 20 is not uniform throughout, deterioration of the first bonding layer 20 occurs over time and fine gaps are generated. When the gap is formed, moisture and air are absorbed through the gap, and the function of the water retention agent is deteriorated, so that the role of the first bonding layer 20 is not properly performed. Specifically, when moisture penetrates into the first bonding layer 20 after construction, the moisture receives heat from sunlight to become water vapor and does not evaporate and stays in the gap, increasing the vapor pressure. When the vapor pressure increases, a swelling phenomenon that is pushed up by the vapor pressure occurs in the gap.

The porous bodies 22 and 23 are evenly distributed inside the first bonding layer 20, so that the solidification of the first bonding layer 20 occurs uniformly over the entire first bonding layer 20. This is because the uniform distribution of the porous bodies 22 and 23 prevents the liquid first bonding layer 20 from aggregating. The porous bodies 22 and 23 may solve the problem that solidification of the first bonding layer 20 does not occur properly. In addition, since the porous bodies 22 and 23 serve as anchors, the first bonding layer 20 continues to maintain a dense state. If the solidification of the first bonding layer 20 is made uniformly over the entire first bonding layer 20, deterioration of the first bonding layer 20 that may occur over time is blocked to prevent the occurrence of fine gaps. restrain When the gap is suppressed, moisture and air are prevented from being absorbed through the gap so that the role of the first bonding layer 20 is sufficiently performed. In this way, when the solidification of the first bonding layer 20 is uniform as a whole and the density is maintained continuously, the absorption of moisture from the outside is prevented and the vapor pressure generated by moisture being heated by sunlight is fundamentally blocked, thereby reducing swelling. symptoms can be eliminated.

Meanwhile, the first bonding layer 20 may include a surface reinforcing agent 24 for reinforcing the surfaces of the base layer 11 and the surface layer 12 in contact with each other. The surface reinforcing agent 24 is preferably an inorganic reinforcing agent containing alkali silicate, and the surface reinforcing agent 24 penetrates into the micropores of the base layer 11 and the surface layer 12 to form calcium hydroxide and insoluble calcium silicate hydrate produced by a hydration reaction. is created to fill the micropores to increase strength.

The alkali silicate is made by mixing at least one of potassium silicate and lithium silicate with sodium silicate, SiO ₂ /R ₂ O (where R is K, Li, Na) in a molar ratio of 1.5 to 4.0, and the content of SiO ₂ 10 to 30% by weight of silver is preferable. In addition, the alkali silicate is preferably 5 to 50% by weight based on the total weight of the surface reinforcing agent (24). If the content of the alkali silicate is less than 5% by weight, the concentration of the alkali silicate is too low, and the surface strengthening effect such as prevention of salt damage, neutralization, etc. is poor. If it exceeds 50% by weight, the viscosity becomes too high, making it difficult to penetrate into the base layer 11 and the surface layer 12, the surface strength of the base layer 11 and the surface layer 12 decreases, and the bonding strength with other compositions decreases. do. In addition to the alkali silicate, an inorganic material for improving the surface hardening effect may be added to the surface hardening agent 24 .

3 is a cross-sectional view for explaining the second resurfacing layer 200 according to an embodiment of the present invention. At this time, the second resurfacing layer 200 is the same as the first resurfacing layer 100 except for the second bonding layer 30 . Accordingly, a detailed description of the overlapping parts will be omitted.

According to FIG. 3 , the second resurfacing layer 200 includes a repair groove 10, a base layer 11, a second bonding layer 30, and a surface layer 12. The second bonding layer 30 bypasses the path of moisture, so that the moisture is more slowly absorbed and evaporated into the porous bodies 22 and 23, thereby preventing cracks of the second bonding layer 30 more effectively. . Inside the second bonding layer 30, plate-shaped ceramics 31, for example, plate-shaped ceramics 31 made of coarse potassium titanate, talc, etc., are stacked in at least two or more layers. case was shown. The layer made of the plate-shaped ceramic 31 is not formed as one layer, but the plate-shaped ceramic 31 forms a layer while forming the gap G. The porous bodies 22 and 23 and the surface hardening agent 24 are dispersed between the plate-shaped ceramics 31.

For the plate-shaped ceramic 31, when coarse potassium titanate is taken as an example, the average length L is preferably 1 to 10 μm. If it is smaller than 1 μm, it is difficult to form a layer while forming a void (G) because the length is short. If it is larger than 10 μm, it is difficult for the porous bodies 22 and 23 and the surface reinforcing agent 24 to enter the space between the plate-shaped ceramics 31 and fill them properly because the length is long. If the filling of the porous bodies 22 and 23 and the surface reinforcing agent 24 is not properly performed, the degree of moisture control is reduced due to the decrease in the density of the second bonding layer 30 . In the drawings, the plate-shaped ceramics 31 are represented as being stacked in parallel, but in practice, each plate-shaped ceramic 31 may be stacked with the whole or part inclined. When the porous bodies 22 and 23 are filled in the space between the plate-shaped ceramics 31, an inflow path of moisture flowing from the outside of the second bonding layer 30 is blocked or maximally blocked.

4 is a cross-sectional view for explaining a third bonding layer 40 according to an embodiment of the present invention. For convenience of explanation, the buffer grid 41 is expressed as a plane. Here, a case in which the third bonding layer 40 is applied instead of the first bonding layer 20 of the first repackaging layer 100 is presented.

Referring to FIG. 4 , the third bonding layer 40 includes a buffer grid 41 in the form of a matrix. The buffer grid 41 prevents the porous bodies 22 and 23 from being damaged when a load is applied to the pavement. The buffer grid 41 can be made of various materials, but a porous material made of synthetic resin is preferable. The buffer grid 41 withstands the load, and if the buffer grid 41 is a porous body, it exhibits the characteristics of the porous bodies 22 and 23 described above, although to a greater or lesser extent. The porous bodies 22 and 23 are filled in the space 41a provided by the buffer grid 41 . Accordingly, the third bonding layer 40 is divided into a lower layer 40a, a porous layer 40b, and an upper layer 40c. The porous layer 40b absorbs moisture and releases it gradually, thereby preventing the third bonding layer 40 from swelling and maintaining adhesion to the base layer 11 and the surface layer 12 .

The third bonding layer 40 is formed by sequentially stacking a lower layer 40a, a porous layer 40b, and an upper layer 40c from the surface of the base layer 11 . The lower layer 40a and the upper layer 40c include a surface strengthening agent 24, and the porous layer 40b includes porous bodies 22 and 23. The surface hardening agent 24 is closer to the base layer 11 and the surface layer 12 to increase the surface strengthening effect of the base layer 11 and the surface layer 12. In the porous layer 40b, moisture is concentrated so that the moisture does not spread throughout the third bonding layer 40.

5 is a cross-sectional view for explaining a fourth bonding layer 50 according to an embodiment of the present invention. For convenience of explanation, the buffer grid 41 is expressed as a plane. Here, a case in which the fourth bonding layer 50 is applied instead of the second bonding layer 30 of the second repackaging layer 200 is presented.

Referring to FIG. 5 , the fourth bonding layer 50 includes a buffer grid 41 in the form of a matrix. The buffer grid 41 prevents the porous bodies 22 and 23 from being damaged when a load is applied to the pavement. The buffer grid 41 can be made of various materials, but a porous material made of synthetic resin is preferable. The buffer grid 41 withstands the load, and if the buffer grid 41 is a porous body, it exhibits the characteristics of the porous bodies 22 and 23 described above, although to a greater or lesser extent. The porous bodies 22 and 23 are filled in the space 41a provided by the buffer grid 41 . Accordingly, the fourth bonding layer 50 is divided into a lower layer 50a, a porous layer 40b, and an upper layer 50b. The porous layer 40b absorbs moisture and releases it slowly, thereby preventing the fourth bonding layer 50 from swelling and maintaining adhesion to the base layer 11 and the surface layer 12 .

The fourth bonding layer 50 is formed by sequentially stacking a lower layer 50a, a porous layer 40b, and an upper layer 50b from the surface of the base layer 11 . The lower layer 50a and the upper layer 50b include the surface hardening agent 24 and the plate-shaped ceramic 31, and the porous layer 40b includes the porous bodies 22 and 23. The surface hardening agent 24 is closer to the base layer 11 and the surface layer 12 to enhance the surface strengthening effect of the base layer 11 and the surface layer 12. The plate-shaped ceramic 31 bypasses the path of moisture, allowing the moisture to be more slowly absorbed and evaporated into the porous bodies 22 and 23, thereby preventing the fourth bonding layer 50 from cracking more effectively. Moisture is concentrated in the porous layer 40b, so that the moisture does not spread throughout the fourth bonding layer 50.

In the above, the present invention has been described in detail with preferred embodiments, but the present invention is not limited to the above embodiments, and various modifications may be made by those skilled in the art within the scope of the technical idea of the present invention. possible.

10; maintenance home 11; understratum
12; surface layer
20, 30, 40, 50; First to fourth bonding layers
21; emulsion layer 22; pottery body
23; Potassium titanate porous body 24; surface hardener
31; plate-shaped ceramic 41; buffer grid
100, 200; First and second resurfacing layers

Claims (10)

It includes an asphalt bonding layer filled inside the repair groove for resurfacing and located between the base layer and the surface layer,
The asphalt bonding layer includes an emulsion layer dispersed in a solution including asphalt fine particles, an emulsifier, and a stabilizer, and includes a pottery porous body, and the pottery porous body includes a plurality of pores and has a weight of 1 to 5 based on the total weight of the bonding layer Including % by weight,
The asphalt bonding layer is divided into a lower layer, a porous layer, and an upper layer, and a surface hardening agent, a layer made of plate-shaped ceramic, and a porous buffer grid are sequentially disposed on the lower layer and the upper layer,
The porous pottery body is filled in the space provided by the buffer grid, and the buffer grid prevents the porous pottery body from being damaged by a load,
The layers made of plate-shaped ceramics are disposed on both sides of the buffer grid, the layers made of plate-shaped ceramics form at least one layer while forming voids G, and the plate-shaped ceramics have an average length of 1 μm to 10 μm,
The surface reinforcing agent is an asphalt concrete resurfacing layer comprising an asphalt emulsion composition, characterized in that located on the outside of the layer made of the plate-shaped ceramic with respect to the buffer grid. The method of claim 1, wherein the porous pottery body contains porous silicon carbide powder, and the silicon carbide powder contains 5 to 50% by weight based on the total weight of the porous pottery body Ascon repacking including an asphalt bonding layer floor. The asphalt concrete resurfacing layer according to claim 1, wherein the asphalt concrete bonding layer further comprises 1 to 5% by weight of a potassium titanate porous body including a plurality of pores. delete The asphalt concrete resurfacing layer including an asphalt bonding layer according to claim 1, wherein the surface reinforcing agent is an inorganic reinforcing agent containing alkali silicate. delete The asphalt concrete resurfacing layer including an asphalt bonding layer according to claim 1, wherein the plate-shaped ceramics are disposed parallel to each other, inclined to each other, or disposed in combination with each other. delete delete delete

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