KR102335743B1 - Concrete structure comprising concrete and mortar having water proof admixtures composition - Google Patents

Abstract

A concrete structure according to one aspect of the present invention comprises: a concrete structure; concrete applied to at least one surface of the concrete structure and including a waterproofing composition; and mortar applied on the concrete and including the waterproofing composition. The waterproofing composition includes sulfur, milk of sulfur, glycerin, sodium hydroxide, potassium hydroxide (KOH), calcium hydroxide (Ca(OH)_2), magnesium oxide (MgO), methyl cellulose, silicon dioxide (SiO_2), and aluminum oxide (Al_2O_3). Other embodiments are possible. Accordingly, working time can be shortened.

Description

Concrete structure comprising concrete and mortar having water proof admixtures composition

The present invention relates to a concrete structure, and more particularly, to a concrete structure having a waterproof composition and a mortar applied to the concrete structure, which includes a waterproof composition that improves watertightness, improves resistance to various chemical components, and suppresses crack formation while being fast-hardening. It's about structures.

In general, concrete is made by adding sand, gravel, water and other admixture materials to cement, and the cement reacts with water to harden. material that becomes

Despite the efforts of designers and builders, cracks occur in concrete after construction, and when carbon dioxide, water, chloride, etc. from the outside penetrate into the concrete through these microcracks, the reinforcing bars in the concrete corrode and the concrete collapses. can occur.

In concrete structures, carbon dioxide and moisture react with time to cause corrosion of reinforcing bars in concrete, and bases such as sea wind, seawater, and calcium chloride for snow removal penetrate into concrete and cause corrosion of reinforcing bars in concrete. The lifespan is shortened due to deterioration due to chloride intrusion, alkali-silica reaction, which reacts and expands in the presence of moisture between high-alkaline cement and certain aggregates, causing cracks in concrete. .

In particular, due to the recent rapid increase in traffic volume, the neutralization rate of concrete is rapidly increasing due to the generation of carbon dioxide in exhaust gas emitted from automobiles. When the reinforcing bar in the concrete corrodes, cracks and peeling of the concrete occur due to the expansion of the rebar volume, and in severe cases, it leads to the collapse of the structure.

To prevent this, a coating composition having a waterproof function was applied to the surface of the concrete structure. However, commercially available products using epoxy or acrylic resin have a problem in that the curing speed in winter is slow and the working period is very long.

Korea Patent Publication No. 10-2014-0004990 "Coal ash sulfur polymer cement concrete made using coal ash and sulfur" Korea Patent No. 10-1419445 "A fast-diameter high-density mortar composition for waterproofing, repairing, and reinforcing concrete structures and a waterproofing, repairing, and reinforcing earthquake-resistant construction method using the same"

The present invention has been devised to solve the above problems, and by forming concrete and mortar containing a waterproofing composition on the concrete surface to protect the concrete surface from neutralization and salt damage in the long term, as well as preventing salt damage of concrete structures The purpose of this is to have the function of waterproofing the coating film to prevent water penetration into cracks while at the same time preventing concrete deterioration and internal rebar corrosion caused by the neutralization of urban structures, calcium chloride sprayed in winter, sulfur dioxide from exhaust gas, etc.

The problems to be solved by the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

A concrete structure according to an aspect of the present invention for solving the above-described problems is a concrete structure; Concrete which is applied to at least one surface of the concrete structure and includes a waterproofing composition; and a mortar applied on the concrete and including the waterproofing composition, wherein the waterproofing composition is sulfur (SULPHUR), sulfur oil (MILK AND SULPHUR), glycerin (GLYCERIN), sodium hydroxide (SODIUM HYDROXIDE), potassium hydroxide (KOH), calcium hydroxide (Ca(OH) ₂ , magnesium oxide (MgO), methyl cellulose (METHYL CELLUROSE), silicon dioxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ) and water.

Other specific details of the invention are included in the detailed description and drawings.

According to the present invention as described above, it has various effects as follows.

According to the present invention, by using the concrete and mortar containing the waterproofing composition to paint the exterior of the concrete structure, the construction method is simple and the workability is excellent, so that the working period can be shortened. In addition, a strong and watertight coating film is formed on the concrete surface to protect the concrete surface from neutralization and salt damage in the long term. It can have the function of waterproofing the film to prevent moisture penetration into the cracked area.

Effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

1 is a cross-sectional view schematically showing a concrete structure according to an embodiment of the present invention.
2 is a cross-sectional view schematically showing a concrete structure according to another embodiment of the present invention.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only the present embodiments allow the disclosure of the present invention to be complete, and those of ordinary skill in the art to which the present invention pertains. It is provided to fully understand the scope of the present invention to those skilled in the art, and the present invention is only defined by the scope of the claims.

The terminology used herein is for the purpose of describing the embodiments and is not intended to limit the present invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, “comprises” and/or “comprising” does not exclude the presence or addition of one or more other components in addition to the stated components. Like reference numerals refer to like elements throughout, and "and/or" includes each and every combination of one or more of the recited elements. Although "first", "second", etc. are used to describe various elements, these elements are not limited by these terms, of course. These terms are only used to distinguish one component from another. Accordingly, it goes without saying that the first component mentioned below may be the second component within the spirit of the present invention.

Unless otherwise defined, all terms (including technical and scientific terms) used herein will have the meaning commonly understood by those of ordinary skill in the art to which this invention belongs. In addition, terms defined in a commonly used dictionary are not to be interpreted ideally or excessively unless specifically defined explicitly.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view schematically showing a concrete structure according to an embodiment of the present invention. 2 is a cross-sectional view schematically showing a concrete structure according to another embodiment of the present invention.

Referring to FIG. 1 , a concrete structure 10 according to an embodiment of the present invention is applied to at least one surface of the concrete structure 100 and includes a waterproofing composition for concrete 200 and concrete 200 . ) and may include a mortar 300 including a waterproof composition.

Here, the waterproof composition is sulfur (SULPHUR) 20 to 26 wt%, sulfur oil (MILK AND SULPHUR) 0.8 to 1.6 wt%, glycerin (GLYCERIN) 1.2 to 2 wt%, sodium hydroxide (SODIUM HYDROXIDE) 11 to 19 wt%, hydroxide Potassium (KOH) 1 to 5% by weight, calcium hydroxide (Ca(OH)2 2 to 8% by weight, magnesium oxide (MgO) 0.5 to 1.5% by weight, methyl cellulose (METHYL CELLUROSE) 6 to 14% by weight, silicon dioxide (SiO2) ) 0.15 to 0.55% by weight, aluminum oxide (Al2O3) 0.1 to 0.5% by weight, and water 30.55 to 48.55% by weight A detailed description of the waterproof composition will be described later.

Also, referring to FIG. 2 , unlike FIG. 1 , the concrete structure 10 is the concrete structure 100 , the mortar 300 and the mortar 300 applied to at least one surface of the concrete structure 100 and including a waterproofing composition. ) and may include the concrete 200 including the waterproof composition.

For example, the thickness of the concrete 200 may be 0.1 ~ 0.5cm. If the thickness of the concrete 200 is less than 0.1 cm, the waterproof effect and the crack prevention effect may be lowered, and if it exceeds 0.5 cm, the workability and workability may be deteriorated.

For example, the thickness of the mortar 300 may be 0.8 to 1.3 cm. If the thickness of the mortar 300 is less than 0.8 cm, the waterproof effect and the crack prevention effect may be lowered, and if it exceeds 1.3 cm, the workability and workability may be deteriorated.

The present invention will be further described with reference to the following examples, but the present invention is not limited to the following examples.

Example

A concrete structure was prepared by applying concrete and mortar including a waterproofing composition to the concrete structure. At this time, the concrete structure was applied to a thickness of 0.3 cm, and the mortar structure was applied to a thickness of 1.0 cm.

Comparative Example 1

A concrete structure was prepared by coating in the same manner as in Example, except that concrete and mortar not containing a waterproofing composition were used for the concrete structure.

Comparative Example 2

A concrete structure was prepared by applying an existing commercially available waterproofing coating to the concrete structure.

Comparative Example 3

A concrete structure was prepared by applying only one of concrete or mortar including a waterproofing composition to the concrete structure.

Evaluation and results

Examples and Comparative Examples 1 to 3 were evaluated by manufacturing a concrete structure according to KS F 2476, applying each component to the surface of the manufactured concrete structure, and performing a physical property test according to KS F 4936.

Neutralization Depth

When the neutralization depth was less than 1.0 mm, it was evaluated as good, when it was about 1.0 mm, it was evaluated as normal, and when it exceeded 1.0 mm, it was evaluated as bad. The neutralization depth was shown to be very good as 0.4 mm in the Example, Comparative Example 1 was evaluated as poor as the neutralization depth was 2.1 mm, and Comparative Examples 2 and 3 were evaluated as normal as 1.1 mm.

Chloride ion penetration resistance

When the chloride ion penetration was less than 1000 coulomb, it was evaluated as good, when it was about 1000 coulomb, it was evaluated as normal, and when it exceeded 1000 coulomb, it was evaluated as bad. Chloride ion permeation was found to be very good as 650 coulomb in Example, Comparative Example 1 was evaluated as poor chloride ion permeation as 1700 coulomb, and Comparative Example 2 and Comparative Example 3 was evaluated as about 1100 coulomb as moderate.

moisture permeability

If the case, the degree of moisture permeation in to, the well is less than 50g / m ² · day, about 50g / m ² · day is usually, exceeding 50g / m ² · day is evaluated as defective. The moisture permeability was ^{found to be very good as 34 g/m 2} ·day in Examples, Comparative Example 1 had a water vapor transmission rate of 75 g/m ² ·day, which was evaluated as poor, and Comparative Examples 2 and 3 was about 55 g/m ² · day was rated as moderate.

Adhesive strength

Bond Strength after after standard curing, after weathering test acceleration, temperature and cooling repeat test, after the alkali resistance test, as well, if it exceeds then salt water test 1.0 N / mm ^2, when about 1.0 N / mm ² is usually As a result, ^{when it was less than 1.0 N/mm 2} , it was evaluated as defective. The adhesion strength was ^{found to be very good as 2.2 N/mm 2} in Examples, Comparative Example 1 had an adhesion strength of 0.5 N/mm ² and was evaluated as poor, and Comparative Examples 2 and 3 were about 0.89 N/mm ² was rated as moderate.

As such, the present invention experimentally demonstrates that the waterproof effect and crack prevention effect are higher when using a commercially available waterproof coating agent or when using two at the same time than when using only one of the concrete 200 or the mortar 300 as one or more layers. As it was confirmed, it is understood that this is due to the fact that moisture penetration is effectively prevented through the heterogeneous interface of the concrete 200 and the mortar 300 containing the waterproofing composition.

In addition, it was confirmed that the waterproofing effect and the crack prevention effect of the concrete structure 10 were higher when the concrete 200 and the mortar 300 including the waterproofing composition were used than when general concrete or mortar was used. A detailed description of the waterproof composition for this is as follows.

The present invention provides a waterproofing composition for concrete and mortar capable of suppressing cracking by not only improving watertightness by enhancing watertightness, but also reducing drying shrinkage of concrete and mortar.

The present inventors have conducted research to prepare a waterproof composition that has less sulfur-specific odor and excellent handling and stability, and thus, sulfur is not used or modified as it is, but is melted in an aqueous solution to prepare a waterproof composition prepared in a liquid form. . Sulfur prepared in liquid form can be easily added when mixing concrete, and can be mixed evenly and quickly into concrete mixture.

Specifically, the waterproof composition for concrete and mortar of the present invention is prepared by first preparing an aqueous sulfur solution obtained by reacting an aqueous solution of a strong base containing potassium hydroxide, sodium hydroxide and calcium hydroxide with sulfur powder under high temperature and high pressure, and glycerin, magnesium oxide, methyl It is prepared by mixing cellulose, silicon dioxide and aluminum oxide in a constant content ratio.

The sulfur powder may be natural sulfur powder or modified sulfur powder, and is not particularly limited in the present invention, and natural sulfur powder is preferably used.

The strong base aqueous solution is to completely melt the sulfur powder, the sulfur aqueous solution is sulfur (SULPHUR) 20 to 26 wt%, sulfur oil (MILK AND SULPHUR) 0.8 to 1.6 wt%, sodium hydroxide (SODIUM HYDROXIDE) 11 to 19 wt% %, potassium hydroxide (KOH) 1 to 5% by weight, and calcium hydroxide (Ca(OH)2 2 to 8% by weight of a strong base aqueous solution containing 2 to 8% by weight is mixed and used. If the strong base aqueous solution is less than the above range, the sulfur is melted properly If it is more than the above range, it may be difficult to suppress the occurrence of cracks in concrete, so an appropriate amount can be used within the above range.

At this time, in order to sufficiently dissolve the sulfur powder, the reaction is performed under high temperature and high pressure instead of normal temperature and pressure. The temperature is 200 ~ 300 ℃, the pressure is carried out for 2 ~ 4 hours at 1.5 ~ 3 atmospheres, if out of these ranges, the sulfur powder is not sufficiently dissolved.

The sulfur aqueous solution obtained after the reaction is used as it is, or is used after filtration to remove impurities.

In particular, by mixing the prepared sulfur aqueous solution with glycerin, magnesium oxide, methyl cellulose, silicon dioxide and aluminum oxide, the waterproofing composition presented in the present invention can be prepared.

Glycerin is in a liquid state, and even if it is added, a composition for waterproofing in a liquid state can be easily prepared.

Glycerin is used to prevent material separation of concrete and mortar. It is a colorless, odorless liquid and has a very high viscosity. It prevents material separation and improves workability when mixed with concrete and mortar. Total weight of waterproofing composition It may be included in an amount of 1.2 to 2% by weight compared to that.

Mixing of the sulfur aqueous solution and glycerin is not particularly limited, and mixing is possible using various known mixing devices.

Magnesium oxide may be included in an amount of 0.5 to 1.5% by weight based on the total weight of the waterproofing composition in powder form.

Magnesium oxide can effectively prevent cracks caused by shrinkage of concrete and mortar. For example, when magnesium oxide powder is mixed in an amount of 0.5 to 1.5% by weight in the waterproofing composition, the effect of preventing cracks in concrete and mortar can be expected without deterioration of the physical properties of concrete and mortar, that is, strength and fluidity.

When magnesium oxide is mixed in less than 0.5% by weight, the effect of preventing cracks in concrete and mortar by mixing of magnesium oxide powder is insignificant, and when mixed in more than 1.5%, fluidity and compressive strength may be reduced.

Methyl cellulose improves viscosity and adhesion to concrete and mortar and is used for attaching surfaces or tiles that are difficult to plaster, and prevents cracks due to shrinkage and expansion of concrete and mortar after construction, and has waterproof and antibacterial effects. In addition, it has good workability and is an all-purpose chemical paste for plastering and exfoliation that is effective for homogeneous mixing of special cement and sand.

Methyl cellulose may be included in an amount of 6 to 14% by weight based on the total weight of the waterproofing solution, and when it is included in an amount exceeding 14% by weight, whitening of concrete and mortar occurs or hardening of concrete and mortar is delayed. In this case, the waterproof effect and the adhesive effect may be reduced.

Silicon dioxide may be included in an amount of 0.15 to 0.55% by weight relative to the total weight of the waterproofing solution, and aluminum oxide may be included in an amount of 0.1 to 0.5% by weight relative to the total weight of the waterproofing solution.

Silicon dioxide and aluminum oxide are used to control shrinkage cracks in concrete and mortar and improve properties as a shrinkage reducing composition such as strength, watertightness, and salt decomposition resistance of concrete and mortar structures, and improve dispersibility, stability, and flow characteristics of concrete It is adopted in consideration of mixing with the carboxyl-based complex compound obtained from the by-products generated in the manufacturing process of the aromatic compound for this purpose.

In addition, the waterproof composition for concrete and mortar of the present invention may further include an additive to further increase waterproofness, dispersion stability, and the like.

The additive includes 1-2 parts by weight of turpentine oil, 1-2 parts by weight of sodium fluoride, 1-2 parts by weight of sodium hydrogen fluoride, 1-2 parts by weight of sodium silicate, and 20-40 parts by weight of water based on 100 parts by weight of the sulfur aqueous solution. It may further include wealth.

The turpentine oil is used to enhance the mutual bonding force of the concrete mixture, and may include 1 to 2 parts by weight based on 100 parts by weight of the sulfur aqueous solution.

The sodium fluoride and sodium hydrogen fluoride react with Ca ²⁺ , Mg ²⁺ , Na ⁺ or K ⁺ ions eluted during the cement hydration reaction to react with a sparingly soluble metal compound, for example, CaF ₂ , MgF ₂ , NaF or KF, etc. By absorbing heat of hydration by creating The sodium fluoride and sodium hydrogen fluoride may each include 1 to 2 parts by weight based on 100 parts by weight of the sulfur aqueous solution.

The sodium silicate (water glass = Na ₂ O·nSiO ₂ ·xH ₂ O, n = 2 to 4) is produced in the hydration process _{of calcium silicate phase (3CaO·SiO 2} , 2CaO·SiO _{2 ), which is the main constituent of cement.} It has the effect of greatly improving the watertightness of concrete by accelerating or directly generating the calcium silicate phase (CaO-SiO _{2 -H 2O) by calcium hydroxide.} In particular, it inhibits the growth of calcium hydroxide crystals and improves the interfacial properties between aggregate and cement, thereby improving the durability of concrete and enhancing its strength. The CSH gel produced by this densely forms the internal structure of concrete and greatly improves the watertightness. The sodium silicate may include 1 to 2 parts by weight based on 100 parts by weight of the sulfur aqueous solution.

The obtained waterproof composition for concrete and mortar has a viscosity similar to that of water, has a transparent yellow to orange color, and has a different color concentration depending on the viscosity.

The waterproof composition for concrete and mortar according to the present invention is prepared in a liquid form, and it can be preferably used for the production of concrete structures and mortar structures by diluting them by concentration. The composition can be used by diluting 500 to 2000 times in water.

The concrete structure has cement and aggregate as the basic composition, and the mortar structure has cement, aggregate and water as the basic composition, and various additives may be used here. The cement is not particularly limited in the present invention, and is mainly used in construction Portland cement, hard hardening cement, hydraulic cement, acid resistant cement, medium heat cement, crude steel cement, low heat cement, sulfuric acid resistant cement, blast furnace slag cement, fly ash cement, Portland pozzolan (silica) cement, white cement, expanded vermiculite cement, At least one selected from the group consisting of intumescent hydraulic cement, masonry cement, super-hard cement, super-rapid cement, vent cement, and oil well cement is possible.

Aggregates can be divided into sand and coarse aggregate. Aggregates with small particles such as sand are expressed as fine aggregates or fine aggregates, and aggregates with relatively large particles are expressed as coarse aggregates or coarse aggregates. Aggregate is an aggregate that includes all of these fine aggregates or coarse aggregates, and in the case of fine aggregates, expressions such as sand are also used interchangeably.

In addition, the aggregate may be of various types, such as recyclable industrial waste, coal ash, silica sand, silica, quartz powder, clay minerals and glass powder, as well as the aforementioned sand, gravel, and crushed stone.

In addition to the above composition, various compositions used in the manufacture of concrete structures and mortar structures may be further included. As an example, special use chemical admixtures such as fly ash, slag, silica fume, metakaolin and water-inseparable admixtures, thickeners, retarders, quick-setting agents, etc. may be additionally included.

At this time, the amount of the waterproofing composition for concrete and mortar suggested in the present invention may be 0.01 to 0.3% by weight, preferably 0.21% by weight, based on the content of cement. For example, when 1,000 kg of cement is used, the waterproof composition can be used in an amount of 2.1 kg by calculating as 'cement weight * 0.21 wt%'.

At this time, depending on the working environment, it is possible to use the waterproof composition immediately before use or after sufficiently mixing by injecting into ready mixed concrete.

In summary, when manufacturing a concrete structure and a mortar structure using the waterproofing composition for concrete and mortar presented in the present invention, there are the following advantages.

First, concrete and mortar have improved watertightness and suppressed crack formation due to drying shrinkage. In particular, as magnesium oxide and methyl cellulose are added, cracks are prevented, adhesion is improved, and whitening can be prevented.

Second, excellent structural stability of the building can be secured due to its excellent waterproofness and strength even when used for building structures exposed to the ground as well as for building structures under the building where waterproofing is particularly required.

Third, it is prepared in a liquid state and can be easily added when mixing cement, sand and gravel, so it is convenient to use.

Fourth, it is easy to calculate the capacity compared to cement, and it is possible to manufacture by concentration during the manufacturing process, so that the user's convenience can be promoted.

The waterproofing material composition for concrete and mortar according to the present invention can be used by directly mixing with the base material of concrete (cement, gravel, sand, water, concrete admixture) or the base material of mortar (cement, sand, water, mortar admixture) Not only can it be used for the purpose of improving the performance of concrete and mortar, but also with special purpose chemical admixtures such as fly ash, slag, silica fume, metakaolin and water inseparable admixtures, thickeners, retarders, quick-setting agents, etc. It can be used stably. In addition, as well as a method of mixing the composition according to the present invention in the process of producing concrete and mortar, it is also possible to use the composition of the present invention mixed with ready-mixed concrete.

Hereinafter, Examples, Comparative Examples, and Experimental Examples are described to help understanding of the effects of the present invention. However, the following description only corresponds to an example regarding the content and effect of the present invention, and the scope and effect of the present invention are not limited thereto.

<Example 1 - Waterproofing composition for concrete>

Sulfur (SULPHUR) 23% by weight, sulfur oil (MILK AND SULPHUR) 1.2% by weight, sodium hydroxide (SODIUM HYDROXIDE) 15% by weight, potassium hydroxide (KOH) 3% by weight, calcium hydroxide (Ca(OH) ₂ 5% by weight, water After mixing 29.55% by weight, it was added to the reactor, the temperature was raised from 100° C. to 250° C., and heated for 3 hours under 2.5 atm, then cooled to 130° C., stirred for 60 minutes, and then cooled to room temperature.

In the reactant, glycerin (GLYCERIN) 1.6 wt%, magnesium oxide (MgO) 1 wt%, methyl cellulose (METHYL CELLUROSE) 10 wt%, silicon dioxide (SiO ₂ ) 0.35 wt%, aluminum oxide (Al ₂ O ₃ ) 0.3 wt% % was added and stirred for 5 minutes, then 10% by weight of water was added and stirred to prepare a waterproof composition for concrete.

Thereafter, the waterproof composition for concrete was added in an amount of 0.21% by weight based on the weight of cement to prepare concrete according to the formulation shown in Table 1 below.

<Comparative Example 1>

Concrete was prepared by the formulation shown in Table 1 below without adding the waterproofing composition for concrete of Example 1.

<Comparative Example 2>

To the waterproofing composition for concrete of Example 1, a waterproofing composition containing only magnesium oxide and methyl cellulose was added to prepare concrete according to the formulation shown in Table 1 below. On the other hand, the additives described in the table mean magnesium oxide and methyl cellulose.

<Comparative Example 3>

Concrete was prepared by adding an appropriate amount of a commercially available waterproofing composition instead of the waterproofing composition for concrete of Example 1 according to the formulation shown in Table 1 below.

unit
(kg/m3) water cement fine aggregate
(sand) thick
aggregate
(Pebble) for concrete
waterproofing composition
(cement * 0.21
weight%) for concrete
waterproofing composition
(cement * 0.21
% by weight, without additives) commercial waterproofing agent Example 1 187 300 801 939 0.63 - - Comparative Example 1 187 300 801 939 - - - Comparative Example 2 187 300 801 939 - 0.63 - Comparative Example 3 187 300 801 939 - - 1.5

<Experimental Example 1> Analysis of concrete properties (Example 1, Comparative Example 1)

In order to evaluate the performance of the waterproofing composition for concrete prepared in Example 1, the concrete of Example 1 including the waterproofing composition for concrete of the present invention and the concrete of Comparative Example 1 without including the waterproofing composition The compressive strength ratio (7 days, 28 days), water absorption coefficient ratio, and water permeability ratio of The results are shown in Table 2 below.

Among the items in Table 2 below, the compressive strength ratio, water absorption strength ratio, and water permeability ratio mean “the value of Example 1 ÷ the value of Comparative Example 1.”

division 1 time result 2nd result average result Compressive strength ratio (7 days) 1.07 1.09 1.08 Compressive strength ratio (28 days) 1.04 1.08 1.06 water absorption intensity ratio 0.66 0.68 0.67 pitching ratio 0.64 0.69 0.656

<Experimental Example 2> Analysis of concrete properties (Example 1, Comparative Example 2)

In order to evaluate the performance of the waterproofing composition for concrete prepared in Example 1, the concrete of Example 1 prepared including the waterproofing composition for concrete of the present invention and waterproofing for concrete prepared without containing only magnesium oxide and methyl cellulose The compressive strength ratio (7 days, 28 days), water absorption coefficient ratio, and water permeability ratio of the concrete of Comparative Example 2 prepared including the composition were measured twice according to KS F 4926 "Waterproofing material for concrete mixing". The results are shown in Table 3 below.

division 1 time result 2nd result average result Compressive strength ratio (7 days) 1.04 1.06 1.05 Compressive strength ratio (28 days) 1.01 1.02 1.015 water absorption intensity ratio 0.62 0.60 0.615 pitching ratio 0.60 0.61 0.615

<Experimental Example 3> Analysis of concrete properties (Example 1, Comparative Example 3)

In order to evaluate the performance of the waterproofing composition for concrete prepared in Example 1, the concrete of Example 1 prepared including the waterproofing composition for concrete of the present invention and the concrete of Comparative Example 3 prepared including a commercially available waterproofing agent Compressive strength ratio (7 days, 28 days), water absorption coefficient ratio and water permeability ratio were measured twice according to KS F 4926 "Waterproofing material for mixing concrete". The results are shown in Table 4 below.

division 1 time result 2nd result average result Compressive strength ratio (7 days) 1.10 1.12 1.115 Compressive strength ratio (28 days) 1.09 1.13 1.11 water absorption intensity ratio 0.71 0.73 0.72 pitching ratio 0.75 0.74 0.745

As shown in Tables 2 to 4, the concrete prepared including the waterproof composition for concrete of the present invention had a higher compressive strength ratio (7 days, 28 days) than Comparative Examples 1 to 3, and thus a hardened concrete body having excellent strength. It can be seen that the water absorption strength ratio and the water permeability ratio are low, and the watertightness is high, and the waterproofness is excellent.

<Example 2 - Waterproofing composition for mortar>

Sulfur (SULPHUR) 23% by weight, sulfur oil (MILK AND SULPHUR) 1.2% by weight, sodium hydroxide (SODIUM HYDROXIDE) 15% by weight, potassium hydroxide (KOH) 3% by weight, calcium hydroxide (Ca(OH) ₂ 5% by weight, water After mixing 29.55% by weight, it was added to the reactor, the temperature was raised from 100° C. to 250° C., and heated for 3 hours under 2.5 atm, then cooled to 130° C., stirred for 60 minutes, and then cooled to room temperature.

In the reactant, glycerin (GLYCERIN) 1.6 wt%, magnesium oxide (MgO) 1 wt%, methyl cellulose (METHYL CELLUROSE) 10 wt%, silicon dioxide (SiO ₂ ) 0.35 wt%, aluminum oxide (Al ₂ O ₃ ) 0.3 wt% % was added and stirred for 5 minutes, and then 10 wt% of water was added and stirred to prepare a waterproof composition for mortar.

Thereafter, the waterproofing composition for mortar was added in an amount of 0.21% by weight based on the weight of cement to prepare mortars according to the formulation shown in Table 5 below.

<Comparative Example 4>

A mortar was prepared by the formulation shown in Table 5 below without adding the waterproofing composition for mortar of Example 2 above.

<Comparative Example 5>

To the waterproofing composition for mortar of Example 2, a waterproofing composition containing only magnesium oxide and methyl cellulose was added to prepare mortars according to the formulation shown in Table 5 below.

<Comparative Example 6>

An appropriate amount of a commercially available waterproofing composition was added instead of the waterproofing composition for mortar of Example 2 to prepare mortars according to the formulation shown in Table 5 below.

unit
(kg/m3) water cement fine aggregate
(sand) for concrete
waterproofing composition
(cement * 0.21
weight%) for concrete
waterproofing composition
(cement * 0.21
% by weight, without additives) commercial waterproofing agent Example 1 135 350 800 0.63 - - Comparative Example 1 135 350 800 - - - Comparative Example 2 135 350 800 - 0.63 - Comparative Example 3 135 350 800 - - 1.5

<Experimental Example 4> Analysis of concrete properties (Example 2, Comparative Example 4)

In order to evaluate the performance of the waterproof composition for mortar prepared in Example 2, the mortar of Example 2 prepared including the waterproof composition for mortar of the present invention and the mortar of Comparative Example 4 prepared without the composition Permeability ratio, water absorption coefficient ratio, stability, compressive strength and adhesion strength were measured twice according to KS F 4925 "Cement liquid type waterproofing material". The results are shown in Table 6 below.

Among the items in Tables 6 to 8, the water permeability ratio and water absorption strength ratio mean 'value of Example 2 ÷ value of Comparative Examples 4-6', and compressive strength and adhesion strength are values for the mortar of Example 2 .

division 1 time result 2 results average result pitching ratio 0.63 0.65 0.64 water absorption coefficient 0.61 0.63 0.62 stability clear clear clear Compressive strength (N/mm2) 32.3 33.5 32.9 Adhesive strength (N/mm2) 1.80 1.85 1.825

<Experimental Example 5> Analysis of concrete properties (Example 2, Comparative Example 5)

In order to evaluate the performance of the waterproofing composition for mortar prepared in Example 2, the mortar of Example 2 prepared including the waterproofing composition for mortar of the present invention and the waterproofing for mortar prepared without only magnesium oxide and methyl cellulose The water permeability, water absorption coefficient ratio, stability, compressive strength and adhesion strength of the mortar of Comparative Example 4 prepared including the composition were measured twice according to KS F 4925 "Cement liquid type waterproofing material". The results are shown in Table 7 below.

division 1 time result 2nd result average result pitching ratio 0.61 0.60 0.605 water absorption coefficient 0.55 0.54 0.545 stability clear clear clear Compressive strength (N/mm2) 31.0 30.5 30.72 Adhesive strength (N/mm2) 1.65 1.58 1.615

<Experimental Example 6> Analysis of concrete properties (Example 2, Comparative Example 6)

In order to evaluate the performance of the waterproofing composition for mortar prepared in Example 2, the mortar of Comparative Example 6 prepared including the mortar of Example 2 prepared including the waterproofing composition for mortar of the present invention and a commercially available waterproofing agent Permeability ratio, water absorption coefficient ratio, stability, compressive strength and adhesion strength were measured twice according to KS F 4925 "Cement liquid type waterproofing material". The results are shown in Table 8 below.

division 1 time result 2nd result average result pitching ratio 0.67 0.70 0.685 water absorption coefficient 0.67 0.715 0.6925 stability clear clear clear Compressive strength (N/mm2) 33.1 33.4 33.25 Adhesive strength (N/mm2) 1.88 1.91 1.895

As shown in Tables 6 to 8, the mortar prepared including the waterproof composition for mortar of the present invention of Example 2 has a higher compressive strength than Comparative Examples 4 to 6, and thus a cured mortar having excellent strength can be made. , it can be seen that the water absorption strength ratio and the water permeability ratio are low, and the watertightness is high and the waterproofness is excellent.

A concrete structure according to an aspect of the present invention includes a concrete structure; Concrete which is applied to at least one surface of the concrete structure and includes a waterproofing composition; and a mortar that is applied on the concrete and includes the waterproofing composition, wherein the waterproofing composition is 20 to 26% by weight of sulfur (SULPHUR), 0.8 to 1.6% by weight of sulfur oil (MILK AND SULPHUR), glycerin (GLYCERIN) 1.2 to 2% by weight, sodium hydroxide (SODIUM HYDROXIDE) 11 to 19% by weight, potassium hydroxide (KOH) 1 to 5% by weight, calcium hydroxide (Ca(OH) ₂ 2 to 8% by weight, magnesium oxide (MgO) 0.5 to 1.5 Weight%, methyl cellulose (METHYL CELLUROSE) 6 to 14% by weight, silicon dioxide (SiO ₂ ) 0.15 to 0.55% by weight, aluminum oxide (Al ₂ O ₃ ) 0.1 to 0.5% by weight and water 30.55 to 48.55% by weight. can

According to various embodiments, the waterproof composition may be liquid.

A concrete structure according to an aspect of the present invention includes a concrete structure; a mortar applied to at least one surface of the concrete structure and comprising a waterproofing composition; And Concrete which is applied on the mortar and includes the waterproofing composition; includes, wherein the waterproofing composition is sulfur (SULPHUR) 20 to 26% by weight, sulfur oil (MILK AND SULPHUR) 0.8 to 1.6% by weight, glycerin (GLYCERIN) 1.2 to 2% by weight, sodium hydroxide (SODIUM HYDROXIDE) 11 to 19% by weight, potassium hydroxide (KOH) 1 to 5% by weight, calcium hydroxide (Ca(OH) ₂ 2 to 8% by weight, magnesium oxide (MgO) 0.5 to 1.5 Weight%, methyl cellulose (METHYL CELLUROSE) 6 to 14% by weight, silicon dioxide (SiO ₂ ) 0.15 to 0.55% by weight, aluminum oxide (Al ₂ O ₃ ) 0.1 to 0.5% by weight and water 30.55 to 48.55% by weight. can

According to various embodiments, the waterproof composition may be liquid.

In the above, embodiments of the present invention have been described with reference to the accompanying drawings, but those of ordinary skill in the art to which the present invention pertains can realize that the present invention can be embodied in other specific forms without changing the technical spirit or essential features thereof. you will be able to understand Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

10: concrete structure
100: concrete structure
200: concrete
300: mortar

Claims (6)

concrete structures; Concrete which is applied to at least one surface of the concrete structure and includes a waterproofing composition; and a mortar applied on the concrete and comprising the waterproofing composition; Including, the waterproof composition is 20 to 26% by weight of sulfur (SULPHUR) relative to the total weight of the waterproofing composition, 0.8 to 1.6% by weight of sulfur oil (MILK AND SULPHUR), 1.2 to 2% by weight of glycerin (GLYCERIN), sodium hydroxide ( SODIUM HYDROXIDE) 11 to 19% by weight, potassium hydroxide (KOH) 1 to 5% by weight, calcium hydroxide (Ca(OH) ₂ 2 to 8% by weight, silicon dioxide (SiO ₂ ) 0.15 to 0.55% by weight, aluminum oxide (Al _{2 )} O ₃ ) containing 0.1 to 0.5% by weight, and 30.55 to 48.55% by weight of water,
Concrete structure, characterized in that it further comprises 0.5 to 1.5% by weight of magnesium oxide (MgO) and 6 to 14% by weight of methyl cellulose (METHYL CELLUROSE). delete According to claim 1,
The waterproof composition is a concrete structure, characterized in that the liquid. concrete structures; a mortar applied to at least one surface of the concrete structure and comprising a waterproofing composition; and Concrete applied on the mortar and including the waterproofing composition; Including, the waterproof composition is 20 to 26% by weight of sulfur (SULPHUR), 0.8 to 1.6% by weight of sulfur oil (MILK AND SULPHUR), 1.2 to 2% by weight of glycerin (GLYCERIN), sodium hydroxide ( SODIUM HYDROXIDE) 11 to 19% by weight, potassium hydroxide (KOH) 1 to 5% by weight, calcium hydroxide (Ca(OH) ₂ 2 to 8% by weight, silicon dioxide (SiO ₂ ) 0.15 to 0.55% by weight, aluminum oxide (Al _{2 )} O ₃ ) containing 0.1 to 0.5% by weight, and 30.55 to 48.55% by weight of water,
Concrete structure, characterized in that it further comprises 0.5 to 1.5% by weight of magnesium oxide (MgO) and 6 to 14% by weight of methyl cellulose (METHYL CELLUROSE). delete 5. The method of claim 4,
The waterproof composition is a concrete structure, characterized in that the liquid.

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