Bridge surface waterproofing agent composition having excellent waterproofness and constructability and bridge surface waterproofing method using same

Abstract

The present invention relates to a bridge surface waterproofing method having excellent waterproofness and constructability. The present invention provides a bridge surface waterproofing method comprising the steps of: evenly preparing the surface of a bridge surface; forming a primer layer on the surface of the bridge surface; forming a waterproofing layer that is from 2 mm to 4 mm by applying a bridge surface waterproofing agent composition onto the primer layer so that the waterproofing layer is inclined in a specific direction of the bridge surface; and forming an asphalt layer on the waterproofing layer, wherein the bridge surface waterproofing agent composition comprises 40 to 60 wt% of asphalt, 5 to 10 wt% of styrene butadiene styrene, 5 to 10 wt% of ethylene glycol dimethacrylate, 3 to 5 wt% of octamethylcyclotetrasiloxane, 5 to 10 wt% of silica particles having an average particle diameter of 200 to 400 nm, 5 to 10 wt% of silica particles having an average particle diameter of 700 to 1000 nm, 3 to 8 wt% of methyl methacrylate, 1 to 3 wt% of 4-hydroxy-3-methoxybenzoic acid, 5 to 10 wt% of a fiber reinforcing material, 1 to 3 wt% of a dispersant, 1 to 3 wt% of a viscosity modifier, and 1 to 3 wt% of a tackifier.

Description

Waterproofing composition for bridge bridges with excellent waterproofing and workability and waterproofing method for bridge bridges using the same

[0001] The present invention relates to a bridge surface waterproofing composition having excellent waterproofing properties and workability and a bridge surface waterproofing method using the same.

[0002] Roads for vehicles such as automobiles are generally manufactured by paving asphalt concrete on flat soil.

[0003] Asphalt concrete is prone to hydroplaning during heavy rain, posing a risk. Therefore, permeable asphalt concrete is increasingly used for road paving.

[0004] For permeable asphalt concrete paved over soil, water permeating through the asphalt concrete is absorbed into the soil, presenting no problem. However, when used on bridges constructed with concrete slabs, the permeated water seeps into the concrete slab, potentially damaging it due to temperature changes.

[0005] Therefore, research is needed on a waterproofing method for bridge slabs that has excellent waterproofing and constructability while using permeable asphalt concrete and preventing water from being transmitted to the concrete slab.

[0006] [Prior Art Literature]

[0007] Korean Patent Publication No. 10-2420637

[0008] The purpose of the present invention is to provide a waterproofing method for a bridge bridge having excellent waterproofing properties and workability.

[0009] The present invention comprises the steps of: evenly preparing the surface of a bridge; forming a primer layer on the surface of the bridge; applying a bridge waterproofing composition on the primer layer to form a waterproofing layer of 2 mm or more and 4 mm or less, and forming the waterproofing layer so as to be inclined in a specific direction of the bridge; And a step of forming an asphalt layer on the waterproofing layer; wherein the bridge waterproofing composition comprises 40 to 60 wt% of asphalt, 5 to 10 wt% of styrene butadiene styrene, 5 to 10 wt% of ethylene glycol dimethacrylate, 3 to 5 wt% of octamethylcyclotetrasiloxane, 5 to 10 wt% of silica particles having an average particle size of 200 to 400 nm, 5 to 10 wt% of silica particles having an average particle size of 700 to 1000 nm, 3 to 8 wt% of methyl methacrylate, 1 to 3 wt% of 4-hydroxy-3-methoxybenzoic acid, 5 to 10 wt% of fiber reinforcing material, 1 to 3 wt% of dispersant, 1 to 3 wt% of viscosity modifier, and 1 to 3 wt% of tackifier.

[0010] The above fiber reinforcement may be corn natural fiber.

[0011] The step of forming the above waterproof layer may be a step of repeatedly applying a waterproofing composition to a portion of the primer layer to form a waterproof layer having a slope of 1° or more and 10° or less in a specific direction of the bridge surface.

[0012] The above dispersant may contain 30 to 50 wt% of polyvinyl alcohol, 30 to 50 wt% of sodium naphthalene sulfonate, 10 to 20 wt% of stearic acid, and 10 to 20 wt% of polyperfluorosulfonic acid, based on 100 wt% of the dispersant.

[0013] The present invention can provide a waterproofing method for a bridge bridge having excellent waterproofing properties and workability.

[0014] Figure 1 shows a flow chart of the waterproofing method of the bridge surface of the present invention.

[0015] The present invention comprises the steps of: evenly preparing the surface of a bridge; forming a primer layer on the surface of the bridge; applying a bridge waterproofing composition on the primer layer to form a waterproofing layer of 2 mm or more and 4 mm or less, and forming the waterproofing layer so as to be inclined in a specific direction of the bridge; And a step of forming an asphalt layer on the waterproofing layer; wherein the bridge surface waterproofing composition comprises 40 to 60 wt% of asphalt, 5 to 10 wt% of styrene butadiene styrene, 5 to 10 wt% of ethylene glycol dimethacrylate, 3 to 5 wt% of octamethylcyclotetrasiloxane, 5 to 10 wt% of silica particles having an average particle size of 200 to 400 nm, 5 to 10 wt% of silica particles having an average particle size of 700 to 1000 nm, 3 to 8 wt% of methyl methacrylate, 1 to 3 wt% of 4-hydroxy-3-methoxybenzoic acid, 5 to 10 wt% of fiber reinforcing material, 1 to 3 wt% of dispersant, 1 to 3 wt% of viscosity modifier, and 1 to 3 wt% of tackifier.

[0016] The step of leveling the surface of the bridge is to remove foreign substances from the bridge and to cut off protruding parts to maintain a flat surface. The bridge is preferably a concrete slab.

[0017] In the step of evenly preparing the surface of the bridge, it is recommended to spray water on the bridge surface, suck up foreign substances using a vacuum pump, or remove foreign substances using a brush, and then dry them.

[0018] The step of forming the above primer layer is a step of forming a primer layer by applying a primer to the surface of the bridge.

[0019] The above primer is a paint that is applied to the bridge surface at a certain thickness and then hardened to enhance corrosion resistance and adhesion when paving roads, and to form a flat surface, thereby improving the bonding strength between the waterproofing layer and the bridge surface. Such primers are commonly used in the field and are not specifically limited in type.

[0020] The step of forming the above waterproof layer includes applying a waterproofing composition on a primer layer to form a waterproof layer of 2 mm or more and 4 mm or less, and forming the waterproof layer so as to slope in a specific direction of the bridge surface. If the waterproof layer is formed below the lower limit, the waterproofing effect and durability of the waterproof layer deteriorate, and if the waterproof layer is formed above the upper limit, the constructability and economic feasibility deteriorate.

[0021] Water that permeates the asphalt layer formed on top of the waterproofing layer cannot penetrate the waterproofing layer and instead remains above it. If water remains between the waterproofing layer and the asphalt layer for a long period of time, the freezing and thawing process can damage both layers. To address this issue, the waterproofing layer is sloped so that water remaining on top of the waterproofing layer can flow in one direction.

[0022] The step of forming the above waterproof layer may be a step of repeatedly applying a waterproofing composition to a portion of the primer layer to form a waterproof layer having a slope of 1° or more and 10° or less in a specific direction of the bridge surface.

[0023] The above-mentioned waterproofing composition comprises 40 to 60 wt% of asphalt, 5 to 10 wt% of styrene butadiene styrene, 5 to 10 wt% of ethylene glycol dimethacrylate, 3 to 5 wt% of octamethylcyclotetrasiloxane, 5 to 10 wt% of silica particles having an average particle size of 200 to 400 nm, 5 to 10 wt% of silica particles having an average particle size of 700 to 1000 nm, 3 to 8 wt% of methyl methacrylate, 1 to 3 wt% of 4-hydroxy-3-methoxybenzoic acid, 5 to 10 wt% of fiber reinforcing material, 1 to 3 wt% of dispersant, 1 to 3 wt% of viscosity modifier, and 1 to 3 wt% of tackifier.

[0024] The asphalt is not particularly limited as long as it is an asphalt commonly used in the art, but petroleum-based asphalt, straight asphalt, or an asphalt mixture may be preferably used. Asphalt may be included in an amount of 40 to 60 wt% of the 100 wt% of the bridge surface waterproofing composition. If it is included in an amount less than the lower limit, it may take a long time for the waterproofing layer to harden, and if it is included in an amount exceeding the upper limit, fluidity may be reduced, resulting in poor workability.

[0025] Styrene butadiene styrene (SBS) suppresses cracking in a bridge surface waterproofing composition, provides waterproofing performance, and improves strength. Styrene butadiene styrene may be included in an amount of 5 to 10 wt% based on 100 wt% of a bridge surface waterproofing composition. If it is included in an amount below the lower limit, the cracking suppression effect of the waterproofing layer deteriorates, and if it is included in an amount exceeding the upper limit, fluidity deteriorates, resulting in poor workability.

[0026] Ethylene glycol dimethacrylate may be included in an amount of 5 to 10 wt% of a 100 wt% waterproofing composition to provide durability, impact resistance, and bonding strength to the waterproofing layer. If included in an amount less than the lower limit, the durability, impact resistance, and bonding strength of the waterproofing layer will be weakened, and if included in an amount exceeding the upper limit, the economic feasibility will deteriorate.

[0027] Octamethylcyclotetrasiloxane can be included in an amount of 3 to 5 wt% of the waterproofing composition for a bridge surface to provide waterproofing properties and waterproof durability effects to the waterproofing layer by providing waterproofing properties. If included in an amount below the lower limit, the waterproofing properties of the waterproofing layer deteriorate, and if included in an amount exceeding the upper limit, the fluidity deteriorates.

[0028] A waterproofing composition for a bridge comprises 5 to 10 wt% of silica particles having an average particle diameter of 200 to 400 nm and 5 to 10 wt% of silica particles having an average particle diameter of 700 to 1000 nm, based on 100 wt% of the composition. The silica particles rise to the surface during the process of applying and curing the waterproofing composition for a bridge, thereby making the surface of the waterproofing layer uneven, thereby allowing water to flow through the unevenness formed by the silica particles. When two types of silica particles having different average particle diameters are used, the surface of the waterproofing layer becomes more uneven, thereby allowing water to flow well.

[0029] Methyl methacrylate may be included in an amount of 3 to 8 wt% of the waterproofing composition for bridge decks to enhance the durability and non-freezing stability of the waterproofing layer. If included in an amount below the lower limit, the durability of the waterproofing layer deteriorates, and if included in an amount exceeding the upper limit, the fluidity deteriorates.

[0030] 4-Hydroxy-3-methoxybenzoic acid may be included in an amount of 1 to 3 wt% of a 100 wt% waterproofing composition to provide waterproofing function, durability against alkalis and acids, resistance to chloride ion penetration, and excellent corrosion prevention effect. If included in an amount below the lower limit, effects such as waterproofing and durability deteriorate, and if included in an amount exceeding the upper limit, economic feasibility deteriorates.

[0031] A fiber reinforcing material is included to improve the durability of the waterproofing layer, and may be included in an amount of 5 to 10 wt% based on 100 wt% of the waterproofing composition for a bridge deck. The fiber reinforcing material may be corn natural fiber. Corn natural fiber has a high melting point, and thus does not melt and can maintain its shape even when working at a high temperature of 180 degrees or higher. The corn natural fiber may be manufactured by: a step of pulping corn stalks under alkaline conditions; a step of mixing and maturing the pulped corn fiber in a dispersion containing 0.1 to 5 wt% of octocinol, 1 to 10 wt% of isosorbide, and 85 to 98 wt% of ethyl alcohol; and a step of drying and pulverizing the corn fiber after completing the maturation.

[0032] The above dispersant imparts polarity to each component of the waterproofing layer composition, thereby enabling them to disperse well with each other and preventing precipitation.

[0033] The above dispersant may contain 30 to 50 wt% of polyvinyl alcohol, 30 to 50 wt% of sodium naphthalene sulfonate, 10 to 20 wt% of stearic acid, and 10 to 20 wt% of polyperfluorosulfonic acid, based on 100 wt% of the dispersant.

[0034] The viscosity modifier is selected from one or more oils selected from the group consisting of animal oil, vegetable oil, lubricating oil, machine oil, polishing oil, waste cooking oil, heavy oil, and process oil. The viscosity modifier reduces viscosity to facilitate workability, prevents a rapid decrease in viscosity change at high temperatures, and thus provides excellent workability. In addition, the shape retention ability is maintained even after work, thereby preventing defects caused by flowing or other phenomena.

[0035] The above-mentioned tackifier functions to strengthen the bonding strength of the composition components, improve adhesion, prevent separation at low temperatures, and improve aging of asphalt.

[0036] The above-mentioned tackifier may preferably be at least one selected from the group consisting of petroleum resins (C9 type, C5 type, C9-C5 copolymer type), maleated petroleum resins, esterified petroleum resins, rosin esters, phenol resins, pine resins, and mixtures thereof.

[0037] Example

[0038] A waterproofing composition for a bridge is prepared according to the ratios shown in the following table. Corn natural fiber was used as the fiber reinforcing material, and a dispersant was used containing 40 wt% of polyvinyl alcohol, 40 wt% of sodium naphthalene sulfonate, 10 wt% of stearic acid, and 10 wt% of polyperfluorosulfonic acid per 100 wt% of the dispersant.

[0039]

[0040]

[0041] The results of measuring the physical properties using the composition of the above example are shown in the table below.

[0042]

[0043] Additionally, a waterproofing test was conducted using the compositions of the examples and comparative examples. Specifically, a flat concrete structure measuring 50 cm in length and width was manufactured, and an epoxy primer was applied. Then, a waterproofing layer 3 mm high was formed at a 5° slope in one direction using the compositions of the examples and comparative examples, and a 5 mm thick asphalt concrete pavement was laid on top. Next, 20 L of water was sprayed, and after 1 hour, the amount of water that had permeated and flowed out to the side was measured, which is shown in the table below. The amounts of water that flowed out were compared and evaluated as very good, good, average, bad, and very bad.

[0044]

[0045] As described above, when a sloped waterproofing layer was formed using the waterproofing compositions of Examples 1 and 2, excellent drainage effects were confirmed. This is presumed to be due to the uneven surface of the waterproofing layer. Additionally, the composition of the dispersant in Example 1 was changed as follows.

[0046]

[0047] Using the dispersants of the above examples and comparative examples, a waterproofing composition for a bridge was prepared in the same ratio as in Example 1, and a waterproofing layer was formed. The results of the evaluation of appearance and workability are shown in the following table. Table 4 shows the results when a waterproofing layer with a 5° inclination was formed, and Table 5 shows the results when a waterproofing layer with a 15° inclination was formed.

[0048]

[0049]

[0050] As shown in the table above, the dispersants of Examples 3 and 4 were found to have excellent uniformity and workability when forming a sloped waterproof layer by evenly mixing the composition.

Claims

1. Step of evenly preparing the surface of the bridge; A step of forming a primer layer on the surface of the bridge; A step of forming a waterproof layer of 2 mm or more and 4 mm or less by applying a waterproofing composition on the primer layer, and forming the waterproof layer so as to be inclined in a specific direction of the bridge surface; and A step of forming an asphalt layer on the above waterproofing layer; A bridge waterproofing method, wherein the above bridge waterproofing composition comprises 40 to 60 wt% of asphalt, 5 to 10 wt% of styrene butadiene styrene, 5 to 10 wt% of ethylene glycol dimethacrylate, 3 to 5 wt% of octamethylcyclotetrasiloxane, 5 to 10 wt% of silica particles having an average particle size of 200 to 400 nm, 5 to 10 wt% of silica particles having an average particle size of 700 to 1000 nm, 3 to 8 wt% of methyl methacrylate, 1 to 3 wt% of 4-hydroxy-3-methoxybenzoic acid, 5 to 10 wt% of fiber reinforcing material, 1 to 3 wt% of dispersant, 1 to 3 wt% of viscosity modifier, and 1 to 3 wt% of tackifier.

2. In paragraph 1, The above fiber reinforcement is a waterproofing method for bridge surfaces made of natural corn fiber.

3. In paragraph 1, The step of forming the above waterproof layer is: A bridge surface waterproofing method, which is a step of forming a waterproofing layer by repeatedly applying a bridge surface waterproofing composition to some parts of the primer layer to have a slope of 1° or more and 10° or less in a specific direction of the bridge surface.

4. In paragraph 1, A waterproofing method for a bridge surface, wherein the dispersant comprises 30 to 50 wt% of polyvinyl alcohol, 30 to 50 wt% of sodium naphthalene sulfonate, 10 to 20 wt% of stearic acid, and 10 to 20 wt% of polyperfluorosulfonic acid, based on 100 wt% of the dispersant.

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