KR102459292B1 - Ramen bridge using high-strength concrete and reinforcing fiber rods - Google Patents

Abstract

The present invention includes a plurality of foundations 110 installed in the ground; an abutment 120 installed in the vertical direction of the base 110; a girder 130 installed in the horizontal direction on the upper portion of the abutment 120; A plurality of main reinforcing bars 140 to be reinforced on the inside of the base portion (110); In order to provide a Ramen bridge using high-strength concrete and reinforcing fiber rods, including; reinforcing fiber rods 150 installed so as to surround a plurality of main reinforcing bars 140, the present invention improves the compressive strength and tensile strength of the foundation, It has the effect of minimizing the width and height. In particular, the present invention has the effect of improving the service life by preventing corrosion and cracking of the foundation. In addition, the present invention has the effect of improving strength and adhesion, as well as stability against contraction and expansion.

Description

Ramen bridge using high-strength concrete and reinforcing fiber rods

The present invention relates to a Ramen bridge using high-strength concrete and reinforcing fiber rods, and more particularly, to a Ramen bridge using high-strength concrete and reinforcing fiber rods to improve the compressive strength and tensile strength of the foundation and to minimize the shape height.

In general, the Ramen Bridge includes a plurality of foundations installed in the ground; an abutment installed in the vertical direction of the base; A girder installed in the horizontal direction on the upper part of the abutment; is constructed as an integrally connected structure.

Such a ramen bridge increases the stability of the abutment, has excellent seismic resistance, and is an excellent bridge type advantageous in maintenance and drivability because there is no pedestal device and expansion joint device.

However, in the prior art, as the load, load, and moment of the abutment and girders were concentrated, the size and height of the foundation were unnecessarily increased, thereby lowering the construction efficiency.

In addition, since the strip reinforcing bars installed inside the foundation lowered the durability due to concrete deterioration and corrosion, as well as the strip rebars could not maintain the proper tensile strength, there was a problem of cracking of the ramen bridge and shortening the service life.

In addition, the concrete of the foundation has a problem that cracks occur due to tensile stress, and air and moisture enter the cracks and break easily through contraction and expansion.

Korean Patent Publication No. 10-0969586 (2010.07.12.) Korean Patent Publication No. 10-1259138 (2013.04.30.) Korean Patent Publication No. 10-1695413 (2017.01.11.) Korean Patent Publication No. 10-2116652 (May 28, 2020)

Therefore, the present invention has been devised to solve the conventional problems as described above,

It is an object of the present invention to provide a Ramen bridge using high-strength concrete and reinforced fiber rods capable of minimizing the shape height by improving the compressive strength and tensile strength of the foundation.

Another object of the present invention is to provide a Ramen bridge using high-strength concrete and reinforcing fiber rods that can improve the service life by preventing corrosion and cracking of the foundation.

Ramen bridge 100 using high-strength concrete and reinforced fiber rods of the present invention for achieving the above object,

A plurality of foundations 110 installed in the ground; an abutment 120 installed in the vertical direction of the base 110; a girder 130 installed in the horizontal direction on the upper portion of the abutment 120; A plurality of main reinforcing bars 140 to be reinforced on the inside of the base portion (110); It is characterized in that it includes a; reinforcing fiber rod 150 installed so as to surround the plurality of main reinforcing bars 140.

Here, the concrete of the base part 110 is

20 to 35 parts by weight of cement, 50 to 60 parts by weight of aggregate, 0.5 to 2 parts by weight of calcium silicate, 0.01 to 2 parts by weight of fluidizing agent, 1-3 parts by weight of hemihydrate gypsum, 1 to 2 parts by weight of aluminum oxide, 1 to cellulose fiber 5 parts by weight, 0.1 to 1 parts by weight of potassium hydroxide, 0.01 to 3 parts by weight of sodium polyacrylate, 0.1 to 5 parts by weight of glass bubble, 0.01 to 5 parts by weight of polyfiber, 1 to 6 parts by weight of 2-ethylhexyl-propenoate Parts, 1-4 parts by weight of pro-2-enoic acid, lauryl methacrylate is characterized in that it contains 0.01 to 5 parts by weight, 0.5 to 3 parts by weight of silk fibroin, 0.5 to 10 parts by weight of re-emulsifying powder resin.

In addition, the reinforcing fiber rod 150 is

40 to 60 parts by weight of reinforcing fiber, 20 to 33 parts by weight of vinyl ester resin, 5 to 15 parts by weight of bisphenol A type epoxy resin, 1 to 15 parts by weight of methyl methacrylate, 0.1 to 10 parts by weight of acrylnitrile, 1 amino group-containing siloxane to 3 parts by weight, 0.5 to 1.5 parts by weight of guar gum, 0.1 to 3 parts by weight of neopentyl glycol, 0.1 to 5 parts by weight of a low-contraction agent, 0.1 to 3 parts by weight of polyvinyl alcohol, 0.1 to 2 parts by weight of xylene, 0.1 to 2 parts by weight of zinc oxide to 5 parts by weight, dicumyl peroxide 0.1 to 2.5 parts by weight, sodium benzoate 0.1 to 1 parts by weight, methoxysilane 0.01 to 2 parts by weight, potassium phosphate 1 to 5 parts by weight.

The present invention has the effect of improving the compressive strength and tensile strength of the base to minimize the width and height.

In particular, the present invention has the effect of improving the service life by preventing corrosion and cracking of the foundation.

In addition, the present invention has the effect of improving strength and adhesion, as well as stability against contraction and expansion.

1 is a side view schematically showing the structure of a Ramen bridge using high-strength concrete and reinforced fiber rods of the present invention.

The structure for achieving the object of the present invention as described above will be described in more detail with reference to the accompanying drawings.

1 is a side view schematically showing the structure of a Ramen bridge using high-strength concrete and reinforced fiber rods of the present invention.

The present invention includes a plurality of foundations 110 installed in the ground; an abutment 120 installed in the vertical direction of the base 110; a girder 130 installed in the horizontal direction on the upper portion of the abutment 120; A plurality of main reinforcing bars 140 to be reinforced on the inside of the base portion (110); It includes;

In particular, the foundation 110 is formed to have a wider width and height than the cross-section of the abutment 120, and is installed in the ground to maintain the same distance as the span of the Ramen bridge.

In the present invention, the foundation 110 in the present invention reduces the construction efficiency by unnecessarily increasing the size (width) and the height as the load and the load and the moment of the abutment 120 and the girder 130 are concentrated. present

For this purpose, the concrete of the base 110 is

20 to 35 parts by weight of cement, 50 to 60 parts by weight of aggregate, 0.5 to 2 parts by weight of calcium silicate, 0.01 to 2 parts by weight of fluidizing agent, 1-3 parts by weight of hemihydrate gypsum, 1 to 2 parts by weight of aluminum oxide, 1 to cellulose fiber 5 parts by weight, 0.1 to 1 parts by weight of potassium hydroxide, 0.01 to 3 parts by weight of sodium polyacrylate, 0.1 to 5 parts by weight of glass bubble, 0.01 to 5 parts by weight of polyfiber, 1 to 6 parts by weight of 2-ethylhexyl-propenoate Parts, 1-4 parts by weight of pro-2-enoic acid, lauryl methacrylate is 0.01 to 5 parts by weight, 0.5 to 3 parts by weight of silk fibroin, 0.5 to 10 parts by weight of the re-emulsifying powder resin.

In particular, the cement serves to improve initial hardening with respect to the physical properties of concrete by bonding the composition to each other, setting the concrete, and increasing the strength after setting.

Here, the cement is preferably 20 to 35 parts by weight.

At this time, when the amount of cement is less than 20 parts by weight, the cement content decreases and the aggregate content increases, so adhesion strength cannot be expected. Conversely, when it exceeds 35 parts by weight, the content of cement is reduced and the compressive strength is lowered.

In addition, as the cement, any one of crude steel cement, alumina cement, and Portland cement can be used, but in the present invention, compared to Portland cement, the content of alite (C3S) effective for short-term strength is high, so that the three-day strength can be improved in only one day. Therefore, it is desirable to use crude steel cement that is effective for emergency construction and can shorten the construction period.

In particular, the crude steel cement is very effectively used when the work time is limited according to the type of construction, such as road construction and underwater construction, or construction requiring shortening of construction period according to seasons such as rainy season and winter season.

On the other hand, the particle size state of the aggregate has a very large effect on the workability of concrete, and the porosity may be reduced or expanded depending on the particle size, so that the unit volumetric weight may be large or small.

In this case, it is very important to properly control the weight of the aggregate because the aggregate also affects physical properties such as strength, watertightness, durability and abrasion resistance of concrete.

Here, the aggregate is preferably 50 to 60 parts by weight.

At this time, when the aggregate is less than 50 parts by weight, the compressive strength of concrete is lowered, and, conversely, when it exceeds 60 parts by weight, the cost increases.

In addition, the calcium silicate is preferably C ₂ S or C ₃ S, and may be mixed and used to control the curing rate and strength.

In particular, the C ₂ S or C ₃ S reacts with water to form calcium hydroxide and calcium silicate hydrate.

In more detail, C ₂ S or C ₃ S reacts with water to elute Ca ²⁺ , and the liquid phase becomes highly alkaline, and when it reaches a supersaturated state, calcium hydroxide crystals are precipitated, and at the same time (SiO ₄ ) ⁴⁺ is a silicate hydroxide ion. (Si(OH) ₆ ) ^2- , and C ₂ S or C ₃ S combines with Ca ²⁺ around the particle to form calcium silicate hydrate (CSH).

This hydrate is low crystalline in a gel state whose chemical composition changes depending on the degree of hydration.

Here, since the hydration reactant has a larger volume than the original unhydrated mineral, it is preferable not to shrink even after curing.

In addition, when 24 hours have elapsed after the initial hydration reaction, the calcium silicate hydration reaction of C ₂ S or C ₃ S, which is a mineral, continues to generate a gel-like calcium silicate hydrate, which is densely filled in the hydrate structure and the cured body is etched. It is possible to offset the shrinkage phenomenon for lingzite reaction and expansion.

Here, the calcium silicate is preferably 0.5 to 2 parts by weight.

At this time, if the calcium silicate is less than 0.5 parts by weight, it is difficult to control the curing rate because it cannot exert the above effect, and if it is more than 2 parts by weight, there is a problem in terms of cost and no longer exhibiting the effect.

And the fluidizing agent is a compound that exerts the effect of increasing the slump in the same unit amount, and it plays the same role as the surfactant.

In particular, the fluidizing agent increases the flow of concrete particles by dispersing the agglomerated particles, thereby improving strength and durability due to the water-reducing effect of the composition water-concrete ratio of the present invention.

At this time, the use of the fluidizing agent was used to reduce the amount of water used by 15 to 20% or more compared to the conventional formulation.

By reducing the amount of water used, it is possible to make concrete with a more dense structure by reducing the number of capillaries, which are the movement paths of moisture, and the concrete with a dense structure helps greatly in suppressing the penetration of moisture from the surface.

Here, the fluidizing agent is preferably melamine-based (Melment F-10) and is used in an amount of 0.01 to 2 parts by weight.

At this time, if the fluidizing agent is less than 0.01 parts by weight, the fluidity is reduced and the performance is not achieved. On the contrary, if it exceeds 2 parts by weight, the mortar viscosity is lowered due to excessive use, and the aggregate separation phenomenon in which the material is separated appears. There is a problem of lowering.

In addition, the hemihydrate gypsum lowers the temperature rise of concrete, delays the heat of hydration, and serves to control cracking due to heat of hydration.

In particular, the hemihydrate gypsum can contribute to the manufacture of concrete by increasing the reaction activity of cement by using a high-powder material, thereby compensating for a decrease in initial strength, and increasing the expression of compressive strength at a later age.

Here, the hemihydrate gypsum is preferably 1 to 3 parts by weight.

At this time, when the amount of the hemihydrate gypsum is less than 1 part by weight, the effect of delaying the heat of hydration is significantly lowered, which may cause cracks in concrete due to the heat of hydration.

In addition, the aluminum oxide forms a strong, corrosion-resistant and waterproof film on the concrete surface to prevent corrosion of reinforcing bars inside the concrete structure.

Here, the aluminum oxide is preferably 1 to 2 parts by weight.

At this time, when the amount of the aluminum oxide is less than 1 part by weight, material separation is easy to occur and the performance improvement effect is insufficient. Conversely, when it exceeds 2 parts by weight, the performance is improved, but the viscosity is increased, thereby causing a problem in workability.

On the other hand, the cellulose fiber is used to improve flexural strength and tensile strength, minimize surface cracks during curing, and is effective for initial construction stability after concrete construction and serves to increase initial dispersibility.

Here, the cellulose fiber is preferably 1 to 5 parts by weight.

At this time, if the cellulose fiber is less than 1 part by weight, the effect of improving tensile strength and flexural strength is insignificant, and if it exceeds 5 parts by weight, workability and economic efficiency are deteriorated.

In particular, the potassium hydroxide increases fluidity and improves workability in the state before curing of the concrete composition, and exhibits effects such as increase in surface adhesion, increase in cohesion, increase in flexural strength, increase in flexibility, and increase in waterproofing in the state after curing of the concrete composition. .

Here, the potassium hydroxide is preferably 0.1 to 1 part by weight.

In this case, if the potassium hydroxide is less than 0.1 part by weight, the effect of strengthening the surface adhesion is insignificant, and if it is more than 1 part by weight, on the contrary, it interferes with the production of a hydration product during the hydration reaction, thereby causing a problem in that the strength is lowered.

On the other hand, the sodium polyacrylate serves to improve the viscosity control and water retention of concrete.

Here, the sodium polyacrylate is preferably 0.01 to 3 parts by weight.

In this case, when the sodium polyacrylate is less than 0.01 parts by weight, the workability of concrete is improved, but the effect of improving water retention is insignificant. Conversely, when it exceeds 3 parts by weight, the performance of the concrete composition is improved but price competitiveness is lowered.

In addition, the glass bubble improves the mechanical properties and filling rate of concrete, and has excellent resistance to shrinkage, so that the deformation of the Ramen bridge due to the shrinkage of concrete is extremely small. As a lightweight filler, of course, it plays a role in reducing the overall weight of the Ramen Bridge.

Here, the glass bubble is preferably in an amount of 0.1 to 5 parts by weight.

At this time, when the amount of the glass bubble is less than 0.1 parts by weight, it is difficult to sufficiently express the characteristics of strength improvement, and on the contrary, when it exceeds 5 parts by weight, the concrete expansion mechanism acts, resulting in a decrease in strength properties.

In addition, the polyfiber has excellent acid resistance, alkali resistance, dispersibility, excellent adhesion to concrete due to the rough surface of the fiber, high tensile strength of the fiber, excellent elastic modulus, low elongation, and high weather resistance.

In particular, the polyfiber has a large number of fibers per unit volume, and through the crosslinking action of the fibers, the tensile strength, flexural toughness, and crack resistance of the concrete composite are improved, and the mechanical properties of concrete such as increasing impact, breakage, and fatigue cyclic load. play a role

Here, the polyfiber is preferably in an amount of 0.01 to 5 parts by weight.

At this time, when the polyfiber is less than 0.01 parts by weight, there is a problem in that the bending strength, tensile strength and crack resistance performance are lowered. On the contrary, when it exceeds 5 parts by weight, there is a problem of a decrease in strength and aggregation of the fibers during concrete mixing.

In the present invention, the 2-ethylhexyl-propenoate serves to impart ductility and enhance adhesion strength of concrete.

Here, the 2-ethylhexyl-propenoate is preferably 1 to 6 parts by weight.

At this time, when the amount of 2-ethylhexyl-propenoate is less than 1 part by weight, the adhesion strength of concrete is lowered, and when it exceeds 6 parts by weight, the compressive strength is lowered and the price is also very high, resulting in poor economic feasibility.

And the pro-2-enoic acid imparts an anionic functional group to the primary polymerization polymer of concrete to neutralize the surface of concrete particles having a large amount of cationic surface functional groups through it, thereby extending the pot life during concrete work and improving the dispersibility of concrete. serves to improve

Here, the pro-2-enoic acid is preferably 1 to 4 parts by weight.

At this time, when the pro-2-enoic acid is less than 1 part by weight, the adhesion strength of concrete is lowered, and, conversely, when it exceeds 4 parts by weight, material separation and fluidity occur greatly due to excessive dispersibility during concrete production.

In addition, the lauryl methacrylate serves to improve flexural toughness and durability.

Here, the lauryl methacrylate is preferably 0.01 to 5 parts by weight.

In this case, when the lauryl methacrylate is less than 0.01 parts by weight, the performance improvement effect is insignificant, and when it exceeds 5 parts by weight, a problem of causing material separation occurs.

On the other hand, the silk fibroin serves to further improve excellent strength such as flexural strength and toughness, water tightness, crack resistance and rust prevention.

Here, the silk fibroin is preferably 0.5 to 3 parts by weight.

In this case, when the silk fibroin is less than 0.5 parts by weight, the performance improvement effect is insignificant, and when it exceeds 3 parts by weight, a problem of lowering price competitiveness occurs.

In addition, the re-emulsification type powder resin is prepared by coating an inorganic anti-caking powder on the surface of the particles dried by spraying latex or emulsion so that the particles can be stored for a long time without agglomeration with each other. Compared to the liquid type polymer dispersion, the use is increasing because it is easy to manufacture a prepackage type product that can be used by adding only water after manufacturing a product in a mixed form of concrete and aggregate in a dry state.

At this time, the re-emulsifiable powder resin has a density of 0.9-1.0 g/cm 3 , and at least one of ethylene vinyl acetate (EVA), polyvinyl acetate-vinyl carboxylate (VaVeoVa), and styrene butadiene rubber (SBR) may be used.

Here, the re-emulsification type powder resin is preferably 0.5 to 10 parts by weight.

At this time, when the re-emulsification type powder resin is less than 0.5 parts by weight, the effect is insignificant, and on the contrary, when it exceeds 10 parts by weight, the hydration effect is disturbed by the coating of the particles, thereby reducing the compressive strength.

Hereinafter, the concrete of the base 110 will be described in more detail through examples, but the scope of the present invention is not limited to the following examples.

It was prepared by mixing the concrete of the base part 110 according to the present invention in an amount shown in Table 1 by weight.

<Comparative Example 1>

100 parts by weight of cement

<Comparative Example 2>

70 parts by weight of cement, 30 parts by weight of aggregate

<Experimental Example 1>

In order to test the flexural strength, a concrete specimen having an age of 30 days prepared in the shape of a flexural strength specimen according to the KSF 4042 method was provided, the flexural strength specimen according to Example 1 as the first specimen, and the flexural strength specimen according to Comparative Example 1 as the second specimen A flexural strength specimen was provided, and the third test specimen was provided with a flexural strength specimen according to Comparative Example 2.

In this way, three test pieces were prepared, and each produced test piece was tested according to the KSF 4042 flexural strength test method, and it was shown in Table 2 below.

As shown in Table 2, in the first test piece of concrete Example 1 of the foundation 110 according to the present invention, the flexural strength was measured to be the highest, indicating that the flexural strength of the concrete of the foundation 110 according to the present invention is excellent. can be checked

<Experimental Example 2>

In order to test the compressive strength, a concrete specimen manufactured in the form of a compressive strength specimen of the KSF 4042 method was provided, and the first specimen was prepared with a compressive strength specimen according to Example 1, and the second specimen was prepared in Comparative Example 1. The compressive strength specimen according to the third test piece was provided with the compressive strength specimen according to Comparative Example 2.

In this way, three test pieces were prepared, and each produced test piece was tested according to the KSF 4042 compressive strength test method, and it was shown in Table 3 below.

As shown in Table 3 above, in the first test piece of Example 1 of concrete of the foundation 110 according to the present invention, the compressive strength was measured to be the highest, and the concrete compressive strength of the foundation 110 according to the present invention was excellent. was able to check

<Experimental Example 3>

In order to test the adhesion strength, a concrete specimen with an age of 30 days prepared in the form of an adhesion strength specimen according to the KSF 4042 method was provided, and the adhesion strength specimen according to Example 1 as the first specimen and Comparative Example 1 as the second specimen Adhesive strength specimen according to the following, the third test piece was equipped with an adhesive strength specimen according to Comparative Example 2.

In this way, three test pieces were prepared, and each produced test piece was tested according to the KSF 4042 adhesion strength test method, and it was shown in Table 4 below.

As shown in Table 4 above, in the first test piece of concrete Example 1 of the foundation 110 according to the present invention, the adhesion strength was measured to be the highest. I could see that it was excellent.

<Experimental Example 4>

In order to test the length change, a concrete specimen of 30 days of age produced in the form of a compressive strength specimen of the KSF 4042 method was prepared, the length change test specimen according to Example 1 as the first specimen, and Comparative Example 1 as the second specimen The length change test specimen according to the following, and the third test specimen was equipped with the length change test specimen according to Comparative Example 2.

In this way, three test pieces were prepared, and each produced test piece was tested according to the KSF 4042 length change test method, and it was shown in Table 5 below.

As shown in Table 5 above, in the first test piece of concrete Example 1 of the foundation 110 according to the present invention, the length change value was the lowest measured, so the change in the concrete length of the foundation 110 according to the present invention was the lowest. It could be confirmed that there is no

In addition, in the present invention, when a load such as a vehicle is loaded on the Ramen bridge, not only the gravity direction load but also the moment is transmitted alternately through the right leg, and is transmitted to the foundation through the abutment.

In the case of a conventional Ramen bridge, the cross section of the foundation must be formed to have a wider width and height than the cross section of the abutment. can

In particular, in the case of the existing concrete ks regulation, the compressive strength is 20 MPa, and the concrete strength of the foundation to which the present invention is applied is 60 MPa, which reduces the cross-section and width of the foundation, as shown in Table 6 below.

In addition, since the concrete compressive strength of the foundation to which the present invention is applied is high, the mold height of the existing Ramen bridge is reduced as shown in Table 7 below, so it can be used in a section where the mold height is limited.

In addition, the present invention replaces the metal band reinforcing bars that are installed to surround the main reinforcing bars formed inside the base of the Ramen bridge, and is replaced with reinforcing fiber rods including reinforcing fibers, so it is free from coating thickness and prevents corrosion of reinforcing bars, deterioration of structure, etc. In addition to solving the problem, the thickness and length of the foundation can be significantly reduced.

The reinforcing fiber rod 150 is

40 to 60 parts by weight of reinforcing fibers, 20 to 33 parts by weight of vinyl ester resin, 5 to 15 parts by weight of bisphenol A epoxy resin, 1 to 15 parts by weight of methyl methacrylate, 0.1 to 10 parts by weight of acrylnitrile, 1 amino group-containing siloxane to 3 parts by weight, 0.5 to 1.5 parts by weight of guar gum, 0.1 to 3 parts by weight of neopentyl glycol, 0.1 to 5 parts by weight of a low-contraction agent, 0.1 to 3 parts by weight of polyvinyl alcohol, 0.1 to 2 parts by weight of xylene, 0.1 to 2 parts by weight of zinc oxide to 5 parts by weight, 0.1 to 2.5 parts by weight of dicumyl peroxide, 0.1 to 1 parts by weight of sodium benzoate, 0.01 to 2 parts by weight of methoxysilane, and 1 to 5 parts by weight of potassium phosphate.

In particular, the reinforcing fibers include acrylic fibers, acrylamide fibers, polyvinyl alcohol fibers, steel fibers, PP (polypropylene) fibers, cellulose nano-fibers, cellulose fibers, PE (polyethylene). Any one of fibers and aramid fibers may be selectively used.

Here, the reinforcing fiber is preferably 40 to 60 parts by weight.

At this time, if the reinforcing fiber is less than 40 parts by weight, the tensile strength and flexural strength suitable for the base of the Ramen bridge become less than the standard, which causes the strength of the base to decrease. It is difficult to sufficiently impregnate with the composition including the excluded components, so that other compositions have a poor binding action with the reinforcing fibers, resulting in a decrease in strength.

On the other hand, the vinyl ester resin serves to provide excellent chemical resistance, adhesion and toughness.

Here, the amount of the vinyl ester resin is preferably 20 to 33 parts by weight.

At this time, when the vinyl ester resin is less than 20 parts by weight, the bending strength and tensile strength are lowered. Conversely, when it exceeds 33 parts by weight, the content of other compositions is relatively low, making it difficult to exert its functions.

In particular, the bisphenol A type epoxy resin is a liquid epoxy resin and has excellent curing properties such as adhesive strength, chemical resistance, and heat resistance. It has excellent dimensional stability, rigidity, high temperature characteristics, and good abrasion resistance, and thus has high mechanical workability.

Here, the amount of the bisphenol A epoxy resin is preferably 5 to 15 parts by weight.

At this time, if the bisphenol A-type epoxy resin is less than 5 parts by weight, the effect is insignificant, and if it exceeds 15 parts by weight, a problem of volume expansion occurs.

On the other hand, the methyl methacrylate serves to prevent cracking and dropping due to external impact by maintaining excellent adhesion and mechanical properties.

In particular, the methyl methacrylate is 50% by weight of a low-viscosity methyl methacrylate (MMA) resin having a viscosity of 100 to 1,500 cps and 50% by weight of a high-viscosity methyl methacrylate (MMA) having a viscosity of 3,000 to 25,000 cps. can also be used.

Here, the methyl methacrylate is preferably 1 to 15 parts by weight.

At this time, if the methyl methacrylate is less than 1 part by weight, workability problems may occur due to the increase in viscosity, and on the contrary, if it exceeds 15 parts by weight, it is difficult to exhibit the effect any more.

And the acrylnitrile serves to improve durability and alkali resistance.

Here, the acrylnitrile is preferably 0.1 to 10 parts by weight.

At this time, if the amount of the acrylnitrile is less than 0.1 parts by weight, the effect of improving durability and alkali resistance is insignificant, and if it is more than 10 parts by weight, the viscosity increases to decrease workability.

In particular, the amino group-containing siloxan (aminofunctional siloxan) serves to effectively cure the reinforcing fiber rod at room temperature and provide improved properties such as heat resistance, low temperature performance, chemical resistance, solvent resistance and oil resistance.

Here, the amount of the amino group-containing siloxane is preferably 1 to 3 parts by weight.

At this time, when the amount of the amino group-containing siloxane is less than 1 part by weight, the curing efficiency of the reinforcing fiber rod is lowered, and when it is more than 3 parts by weight, the viscosity increases, thereby reducing workability.

On the other hand, the guar gum is a water-soluble polymer material, a natural resin, and exhibits excellent performance when the above formulation is applied due to the interaction between the expansion and dehydration by hydration reaction and the expansion action during solidification by the hydration reaction of the composition.

Here, the amount of guar gum is preferably 0.5 to 1.5 parts by weight.

At this time, when the amount of guar gum is less than 0.5 parts by weight, the elasticity of the reinforcing fiber rod is lowered, and on the contrary, when it exceeds 1.5 parts by weight, there is a problem of lowering workability.

And the neopentyl glycol serves to allow the reinforcing fibers and the resin composition to be cured even at a low temperature.

Here, the neopentyl glycol is preferably 0.1 to 3 parts by weight.

At this time, when the amount of neopentyl glycol is less than 0.1 parts by weight, the curing efficiency of the reinforcing fiber rod is lowered. On the contrary, when it exceeds 3 parts by weight, the plasticizing efficiency is unnecessarily increased, thereby reducing workability.

On the other hand, the low shrinkage agent serves to prevent the shrinkage of the resin during curing of the reinforcing fiber rod composition.

In particular, the low shrinkage agent may include polyvinyl acetate, saturated polyester, vinyl chloride, and the like.

Here, the low-contraction agent is preferably 0.1 to 5 parts by weight.

At this time, when the low-shrink agent is less than 0.1 parts by weight, the effect is insignificant, and on the contrary, when it exceeds 5 parts by weight, the performance is not improved any more.

In addition, the polyvinyl alcohol serves to not only improve dispersibility, but also reduce the defect rate such as lifting and distortion by improving adhesion.

Here, the polyvinyl alcohol is preferably 0.1 to 3 parts by weight.

At this time, when the polyvinyl alcohol is less than 0.1 parts by weight, the effect is insignificant, and on the contrary, when it exceeds 3 parts by weight, the amount is excessive and not economical, and there is a problem that may adversely affect the weather resistance of the reinforcing fiber rod.

In particular, the xylene serves to control the viscosity of the composition and improve workability.

Here, the amount of xylene is preferably 0.1 to 2 parts by weight.

At this time, if the amount of xylene is less than 0.1 parts by weight, the effect of viscosity control is insignificant, and if it is more than 2 parts by weight, the amount of xylene is excessive and may have a bad effect.

In addition, the zinc oxide serves to accelerate curing and prevent corrosion.

Here, the zinc oxide is preferably 0.1 to 5 parts by weight.

At this time, if the zinc oxide is less than 0.1 parts by weight, corrosion prevention properties are deteriorated, and if it is more than 5 parts by weight, adhesion is deteriorated due to the rapid reaction of the composition.

And the dicumyl peroxide serves as a curing agent.

Here, the dicumyl peroxide is preferably 0.1 to 2.5 parts by weight.

At this time, if the dicumyl peroxide is less than 0.1 parts by weight, the curing efficiency is lowered, and if it exceeds 2.5 parts by weight, there is a problem of lowering workability.

In particular, the sodium benzoate serves to increase the viscoelasticity of the composition.

Here, the sodium benzoate is preferably 0.1 to 1 part by weight.

At this time, when the sodium benzoate is less than 0.1 part by weight, the effect is insignificant, and, conversely, when it exceeds 1 part by weight, a problem of lowering physical properties occurs.

On the other hand, the methoxysilane serves to further improve adhesion by increasing the wettability between the organic resin and the inorganic silica or silicate.

Here, the methoxysilane is preferably 0.01 to 2 parts by weight.

At this time, if the methoxysilane is less than 0.01 parts by weight, there may be a problem in that the wettability is lowered and the adhesive strength is also lowered.

And the potassium phosphate serves to secure the initial strength by rapidly accelerating the dissolution of the composition to increase the initial heat of reaction to speed up the setting and hardening.

Here, the potassium phosphate is preferably 1 to 5 parts by weight.

At this time, when the potassium phosphate is less than 1 part by weight, the hydrolysis rate is lowered and the strength is lowered. Conversely, when it exceeds 5 parts by weight, the potassium phosphate is contracted by the quick setting performance to cause cracks.

Hereinafter, the reinforcing fiber rod 150 will be described in more detail through examples, but the scope of the present invention is not limited to the following examples.

The reinforcing fiber rod 150 according to the present invention was prepared by mixing the parts by weight shown in Table 8.

<Comparative Example A>

50 parts by weight of reinforcing fiber, 50 parts by weight of vinyl ester resin

<Comparative Example B>

50 parts by weight of reinforcing fiber, 40 parts by weight of vinyl ester resin, 10 parts by weight of bisphenol-a epoxy resin

Example 2 and Comparative Examples A and B were tested by the following test method.

<Test method>

Tensile strength: KSM ISO 527-4

Flexural strength: KSM ISO 14125

Compressive strength: KSM ISO 14126

It was tested according to the above test method, and it was shown in Table 9 below.

As above, the tensile strength, flexural strength, and compressive strength are all improved, so that the width and height of the foundation can be minimized in the case of a Ramen bridge.

As described above, the embodiment of the present invention has been described in detail, but the scope of the present invention is not limited thereto, and it is natural that the present invention is included in the scope of the present invention to a configuration substantially equivalent to the embodiment of the present invention. do.

100: Ramenism
110: base 120: shift
130: girder 140: cast rebar
150: reinforcing fiber rod

Claims (3)

A plurality of foundations 110 installed in the ground; an abutment 120 installed in the vertical direction of the base 110; a girder 130 installed in the horizontal direction on the upper portion of the abutment 120; A plurality of main reinforcing bars 140 to be reinforced on the inside of the base portion (110); Reinforcing fiber rods 150 installed to surround a plurality of main reinforcing bars 140, including;
Concrete of the foundation 110 includes 20 to 35 parts by weight of cement, 50 to 60 parts by weight of aggregate, 0.5 to 2 parts by weight of calcium silicate, 0.01 to 2 parts by weight of a fluidizer, 1 to 3 parts by weight of hemihydrate gypsum, and 1 part by weight of aluminum oxide. to 2 parts by weight, 1 to 5 parts by weight of cellulose fiber, 0.1 to 1 part by weight of potassium hydroxide, 0.01 to 3 parts by weight of sodium polyacrylate, 0.1 to 5 parts by weight of glass bubble, 0.01 to 5 parts by weight of polyfiber, 2-ethyl 1 to 6 parts by weight of hexyl-propenoate, 1 to 4 parts by weight of pro-2-enoic acid, 0.01 to 5 parts by weight of lauryl methacrylate, 0.5 to 3 parts by weight of silk fibroin, 0.5 to 10 parts by weight of re-emulsifying powder resin Ramen bridge using high-strength concrete and reinforced fiber rods, characterized in that it includes a part. delete The method according to claim 1, The reinforcing fiber rod 150 is 40 to 60 parts by weight of the reinforcing fiber, 20 to 33 parts by weight of a vinyl ester resin, 5 to 15 parts by weight of a bisphenol A epoxy resin, 1 to 15 parts by weight of methyl methacrylate, 0.1 to 10 parts by weight of acrylnitrile, 1 to 3 parts by weight of amino group-containing siloxane, 0.5 to 1.5 parts by weight of guar gum, 0.1 to 3 parts by weight of neopentyl glycol, 0.1 to 5 parts by weight of a low-contraction agent, 0.1 to 3 parts by weight of polyvinyl alcohol , xylene 0.1 to 2 parts by weight, zinc oxide 0.1 to 5 parts by weight, dicumyl peroxide 0.1 to 2.5 parts by weight, sodium benzoate 0.1 to 1 parts by weight, methoxysilane 0.01 to 2 parts by weight, potassium phosphate 1 to 5 Ramen bridge using high-strength concrete and reinforced fiber rods, characterized in that it contains parts by weight.

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