KR101989849B1 - Additive for binding for adhesion of cement concrete - asphalt - Google Patents

Abstract

The present invention relates to an organic-inorganic mixed type combination additive for cement concrete and asphalt bonding. In a road consisting of a cement concrete layer and an asphalt layer constructed on top the cement concrete layer, a combination additive comprising the cement concrete layer and the asphalt layer is composed by comprising: 1 to 3 wt% of organic acid; 5 to 10 wt% of sulfate; 3 to 5 wt% of sulfite; 5 to 10 wt% of carbonate; 5 to 10 wt% of phosphate; and residual amount of chloride. According to the present invention, it is possible to firmly combine the cement concrete and the asphalt by applying a combination additive to the surface of the cement concrete which is a base layer before the construction of asphalt, or adding the same during asphalt composition.

Description

In this study, we investigated the effect of cement concrete and asphalt on the adhesion of cement concrete and asphalt.

The present invention relates to a bonding additive for bonding a cement concrete layer and an asphalt layer to a road comprising a cement concrete layer and an asphalt layer formed on the cement concrete layer.

Generally, in the conventional road construction method, the ground is piled up to a certain depth, the gravel and the large aggregate are laid on the floor for drainage, the small aggregate is piled on the ground, and the soil is covered on the top, Later, asphalt was built.

However, in recent years, in order to shorten the construction period, a certain amount of concrete structure is formed on the soil, and the asphalt is applied by applying the asphalt immediately.

However, in such a construction method, since the bonding between the asphalt layer and the concrete structure as the base layer is not completely performed, various problems such as peeling due to weakening of cohesive force due to rain or freezing have arisen, and various techniques have been developed to solve this problem.

For example, in "Mastic Asphalt Paving Mixture and Method for Manufacturing the Same" (Korean Patent Registration No. 10-1896102, Patent Document 1), an adhesive layer is continuously formed on the upper side of cement concrete and asphalt pavement is formed thereon The asphalt pavement layer is composed of an asphalt binder composition and an aggregate, and the adhesive is composed of an epoxy asphalt layer.

In addition, a method of addressing goose asphalt and a coating layer between a concrete structure and an asphalt concrete forming a road surface is disclosed in "Goos Asphalt Composition and Road Paving Method Using the Same" (Korean Patent Registration No. 10-1784950 and Patent Document 2) .

However, the above-mentioned Patent Documents 1 and 2 are not only difficult to manufacture and construct additives between the cement concrete structure and the asphalt, but also require a lot of improvement because the quality is not high.

This is due to the fact that many road repair work sites have occurred, and due to such weak bonding force, there is a large difference in thermal expansion coefficient between summer and winter, and separation between cement concrete and asphalt layer due to moisture such as rain or snow .

When the pre-treatment method is applied, there is a difficulty in increasing the construction cost because the construction period is increased.

KR 10-1896102 (Aug. 31, 2018) KR 10-1780347 (2017.09.14)

In order to facilitate the bonding between the cement concrete and the asphalt layer in the general road construction of the present invention, the organic-inorganic hybrid additive is used to solve the above-described problems in the prior art, and is applied to the surface of the cement concrete as the base layer before the asphalt application Or asphalt, so that the cement concrete and asphalt can be firmly bonded to each other.

The present invention relates to an organic / inorganic hybrid additive for bonding cement concrete and asphalt layers, and a binder additive for bonding the cement concrete layer and the asphalt layer on a road comprising a cement concrete layer and an asphalt layer applied on the cement concrete layer. , A chloride is contained in an amount of 1 to 3% by weight of an organic acid, 5 to 10% by weight of a sulfate, 3 to 5% by weight of a sulfite, 5 to 10% by weight of a carbonate, 5 to 10% by weight of a phosphate,

In the above configuration, 0.1 to 0.5 parts by weight of a dispersing agent is added based on 100 parts by weight of the binding additive.

Also, 20 to 40 parts by weight of gilsonite is added based on 100 parts by weight of the binding additive.

Also, blast furnace slag is added in an amount of 20 to 40 parts by weight based on 100 parts by weight of the binder additive.

In addition, the organic acid may be any one selected from citric acid and malic acid, the sulphate is composed of any one selected from magnesium sulfate and sodium sulfate, the sulfuric acid salt is sodium hydrogensulfite, and the carbonate is any one selected from potassium carbonate and sodium carbonate Wherein the phosphate is sodium triphosphate, and the chloride is selected from the group consisting of a mixture of calcium chloride and magnesium chloride, sodium chloride, and calcium chloride.

According to the present invention, it is possible to firmly bond the cement concrete and the asphalt to each other by coating the surface of the cement concrete as a base layer before application of the asphalt or during the formation of the asphalt layer.

1 is a photograph showing the progress of Experimental Example 1 according to the present invention.
2 is a photograph showing the progress of Experimental Example 2 according to the present invention.
3 is a photograph showing the progress of Experimental Example 3 according to the present invention.

The present invention relates to a bonding additive for bonding a cement concrete layer and an asphalt layer on a road comprising a cement concrete layer and an asphalt layer formed on the cement concrete layer.

More specifically, it is possible to increase the bonding force between the ascon and the concrete applied to the road, to induce the bonding with the organic material existing in the ascon, to induce the ion bonding, and to improve the ionic bonding force with the surface of the soil or aggregate in the concrete of the base layer And to an inducible oil-and-inorganic bonding additive.

The binding additive of the present invention is composed of 1 to 3% by weight of organic acid, 5 to 10% by weight of a sulfate, 3 to 5% by weight of a sulfite, 5 to 10% by weight of a carbonate, 5 to 10% by weight of a phosphate and a residual amount of chloride.

In the above-mentioned constitution, the organic acid may be any one selected from citric acid and malic acid.

The sulphate is composed of any one selected from magnesium sulfate and sodium sulfate, and the sulfur dioxide is composed of sodium hydrogensulfite.

In addition, the carbonate is composed of any one selected from potassium carbonate and sodium carbonate, and the phosphate is composed of sodium triphosphate.

The chloride is composed of any one selected from a mixture of calcium chloride and magnesium chloride, sodium chloride, and calcium chloride.

In addition, 0.1 to 0.5 parts by weight of a dispersing agent may be added based on 100 parts by weight of the binding additive.

The dispersing agent may be composed of one species selected from among amides, amines, polybutene succinimides, polyolefin amines, polyether amines, paraffin dispersants which are derivatives of fatty amines, and paraffin block copolymers which are derivatives of fatty amines.

Also, 20 to 40 parts by weight of gilsonite based on 100 parts by weight of the binding additive may be added.

Ginsonite is a natural asphalt classified as bituminous and has high aspartic acid content, good solubility in organic solvents, and high nitrogen content.

The blast furnace slag may be added in an amount of 20 to 40 parts by weight based on 100 parts by weight of the binder additive.

Blast furnace slag is a slag that forms pig iron from iron ore in a blast furnace. It is a collection of impurities other than iron.

In addition, it is most preferred that the binder additive as described above is applied to the cement concrete in a mixed state with the asphalt. In this case, the additive is added so that the additive is less than 5 wt%, most preferably 2 to 4 wt% .

The above-mentioned constitution has a basic principle in the reaction between an inorganic particle and an inorganic reactive binder.

The main component of the ascon is an organic substance, which reacts with citric acid to the blast furnace slag to induce defects on the surface. The ascon is surrounded by the damaged surface, and the ionic salts of the inorganic additives are ionically bonded with the organic system. At the same time, The combination of inorganic additives and citric acid makes the association between the organism of the ascon and the cement forming the basal layer of the road excellent.

Hereinafter, embodiments of the present invention will be described.

First, the raw materials were mixed with the composition shown in Table 1 to prepare a binder additive.

<Composition of bonding additive of the embodiment, unit: g> division Organic acid sulfate Sulfite lead carbonate Ginseng salt chloride Blast furnace slag gypsum Gilson Night Dispersant Example 1 2 7 4 7 7 73 0 0 0 0 Example 2 3 10 5 10 10 62 0 0 0 0 Example 3 One 5 3 5 5 81 0 0 0 0 Example 4 2 7 4 7 7 73 0 30 0 0 Example 5 2 7 4 7 7 73 30 0 0 0 Example 6 2 7 4 7 7 73 30 30 0 0 Example 7 2 7 4 7 7 73 30 30 10 0 Example 8 2 7 4 7 7 73 30 30 0 0.3 Example 9 2 7 4 7 7 73 30 30 10 0.3

In the above composition, citric acid was used as an organic acid, magnesium sulfate was used as a sulfate, sodium hydrogen sulfite was used as a sodium hydrogen sulfite, potassium carbonate was used as a carbonate, sodium triphosphate was used as a ginseng salt and calcium chloride was used as a chloride. Acid salts were used.

Next, to remove small molecules, a bitumen which was heat-treated for 3 hours in a nitrogen atmosphere was prepared, and a road repair adhesive was prepared by mixing the prepared binder additive and alcohol.

At this time, bitumen, binding additive and alcohol were mixed at a weight ratio of 1: 1: 1.

<Preparation of Comparative Example>

In order to distinguish them from the examples, the raw materials were mixed in the compositions shown in Table 2 to prepare the comparative additive.

<Composition of bonding additive of Comparative Example, unit: g> division Organic acid sulfate Sulfite lead carbonate Ginseng salt chloride Blast furnace slag gypsum Gilson Night Dispersant Comparative Example 1 4 7 4 7 7 71 0 0 0 0 Comparative Example 2 0 7 4 7 7 75 0 0 0 0 Comparative Example 3 2 11 4 7 7 69 0 0 0 0 Comparative Example 4 2 4 4 7 7 76 0 0 0 0 Comparative Example 5 2 7 6 7 7 71 0 0 0 0 Comparative Example 6 2 7 2 11 7 71 0 0 0 0 Comparative Example 7 2 7 4 4 7 80 0 0 0 0 Comparative Example 8 2 7 4 7 11 69 0 0 0 0 Comparative Example 9 2 7 4 7 4 76 0 0 0 0

In addition, a pitch for heat treatment in a nitrogen atmosphere for 3 hours was prepared, followed by mixing the prepared bonding additive and alcohol to prepare a road repair adhesive.

At this time, bitumen, binding additive and alcohol were mixed at a weight ratio of 1: 1: 1.

[Experimental Example 1]

Cement bricks were prepared, and the binder additive of each of the examples and comparative examples was mixed in an amount of 3 wt% of the total weight of the asphalt, followed by coating and curing, and the state after curing was visually inspected.

FIG. 1 shows this state of experiment. The upper left side is the prepared cement brick, and the upper right side is a state immediately after the adhesive agent is applied to the prepared cement brick.

Examples 1 to 9 are shown from left to right and from top to bottom in the upper left and upper right views.

The lower left side view shows Examples 7 to 9, and the lower right side view shows Example 2, which shows a state after a mixture of asphalt and an additive is applied on concrete.

As shown in the photograph, it was found that the contact area was enlarged by blocking the gap between the asphalt and the cement bricks mixed with the additives, and it was confirmed that the cement brick was not rubbed by the hand rubbing with the asphalt attached.

[Experimental Example 2]

After the concrete block was prepared, the adhesive was applied in the same manner as in Experimental Example 1 and then cured.

FIG. 2 shows the state of the experiment, wherein the upper left side is a prepared concrete block, and the upper right side is a state immediately after application of a mixture of an additive to an asphalt and a prepared concrete block,

The lower left side and the lower right side are the state after application of an additive mixed with asphalt.

Blocks listed in the upper left, upper right, and lower left photographs indicate Examples 1 through 9 from top to bottom, left to right.

In addition, the lower right photograph is an enlarged view of Examples 7 to 9 from left to right.

At this time, asphalt application was performed at a temperature of 150 ° C or higher.

As a result, asphalt did not appear on the concrete block surface even after applying asphalt at a temperature of 150 ° C or higher as shown in the photograph.

[Experimental Example 3]

Pure cement mortar was prepared and applied to the bottom surface and cured to prepare concrete directly. The prepared concrete was coated with an additive mixed with the asphalt of the example.

The upper left side of FIG. 3 shows the manufactured concrete, the upper right side shows a state after the mixture of the additives with the asphalt, and the lower left and lower right portions shows the state after the additives are mixed with the asphalt.

Three samples on the lower right side of Fig. 3 show Examples 7 to 9 from left to right, and samples on the lower left side show Examples 2 and 6. Fig.

In this case, it was confirmed that the mixture of asphalt and additives was not separated from the cement concrete.

Meanwhile, in the same manner as in Experimental Example 2, the adhesive prepared in Comparative Examples 1 to 9 was applied to the concrete block, and then the asphalt was applied at a temperature of 150 ° C or more.

As a result, in the case of Comparative Examples 1 to 9, it was confirmed that the mixture of the additives in the asphalt easily separated from the concrete block when rubbed by hand.

In addition, the concrete block specimens prepared in Experimental Example 2 and the concrete block specimens prepared in the above comparative experiment were prepared, and then the adhesion strength was measured according to KS F 2386.

The results are shown in Table 3 below.

&Lt; Bond strength, unit: MPa) object Bond strength object Bond strength Reason Wet Reason Wet Example 1 1.6 1.5 Comparative Example 1 1.1 0 Example 2 1.5 1.5 Comparative Example 2 1.2 0.3 Example 3 1.4 1.4 Comparative Example 3 1.1 0.2 Example 4 1.5 1.5 Comparative Example 4 0 0 Example 5 1.5 1.5 Comparative Example 5 0.7 0.4 Example 6 1.6 1.6 Comparative Example 6 0 0 Example 7 1.5 1.5 Comparative Example 7 0.7 0 Example 8 1.6 1.5 Comparative Example 8 0.8 0.3 Example 9 1.7 1.7 Comparative Example 9 0.6 0

As shown in the above experiment, the adhesion strength of the ascon was high on the concrete block surface as a whole in the case of Examples, and it was the highest in Example 9.

On the other hand, the bonding strengths of the comparative examples were lower than those of the examples in the whole, and they were remarkable especially in the wet state.

This is because the adhesive force is not generated at all during the construction in the wet state, and therefore, it is required to be applied only in the state of construction.

As a result, it has been found that the bonding additive according to the present invention can prevent permeation of water and moisture by forming a waterproof layer of a coating film during the packaging operation, It is believed that it acts as a joint that can cope with micro cracks and cracks in the structure and protects the concrete because it is not influenced by alkali or acid due to the influence of organic and inorganic additives, thereby improving the durability.

Claims (5)

delete delete 1. A bonding additive for bonding a cement concrete layer and an asphalt layer on a road comprising a cement concrete layer and an asphalt layer formed on the cement concrete layer,
Wherein the organic acid comprises 1 to 3% by weight of an organic acid, 5 to 10% by weight of a sulfate, 3 to 5% by weight of a sulfite, 5 to 10% by weight of a carbonate, 5 to 10% by weight of a phosphate,
0.1 to 0.5 parts by weight of a dispersing agent is added based on 100 parts by weight of the binding additive,
Wherein 20 to 40 parts by weight of gilsonite is added based on 100 parts by weight of the binding additive.
Mixing additive of organic and inorganic type for cement concrete and asphalt bonding.
The method of claim 3,
Wherein the blast furnace slag is added in an amount of 20 to 40 parts by weight based on 100 parts by weight of the binder additive.
Mixing additive of organic and inorganic type for cement concrete and asphalt bonding.
5. The method of claim 4,
Wherein the organic acid is any one selected from citric acid and malic acid,
The sulfuric acid salt is composed of any one selected from magnesium sulfate and sodium sulfate,
The disulfonate is composed of sodium hydrogensulfite,
The carbonate is composed of any one selected from potassium carbonate and sodium carbonate,
The phosphate is composed of sodium triphosphate,
Wherein the chloride is composed of any one selected from a mixture of calcium chloride and magnesium chloride, sodium chloride, and calcium chloride.
Mixing additive of organic and inorganic type for cement concrete and asphalt bonding.

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