KR102032452B1 - Grout composition for charging inside of sheaths - Google Patents

Abstract

The present invention is to provide a grout composition for prestressed concrete capable of maintaining flowability even if working time is increased and inhibiting bleeding. The composition comprises water and cement at a water-cement ratio (W / C) of 0.30 to 0.32 and 0.005 to 0.01 parts by weight of an admixture based on 100 parts by weight of the cement. The admixture comprises 50 to 80 wt% of a quartz sand-based filler, 15 to 30 wt% of a polycarbonic acid-based water reducing agent, 0.1 to 1.00 wt% of a nonmetallic gas inflating agent, 0.1 to 1 wt% of a gum-based thickener and 1 to 5 wt% of a silicon-based antifoaming agent.

Description

GROUT COMPOSITION FOR CHARGING INSIDE OF SHEATHS}

The present invention relates to a admixture composition which is contained in the grout for filling the sheath pipe for preventing corrosion of the PS steel, in relation to the post-tension method, among the prestressed concrete methods.

Prestressed Concrete (PSC) is a concrete construction method in which prestressing steel is tensioned and compressive stress is introduced in advance to offset the tensile stress of reinforced concrete. Such prestressed concrete is classified into a pretensioning method and a posttensioning method according to the tension timing.

Among them, in the case of the post-tension method, the sheath pipe is constructed before concrete pouring, the concrete is cured, and the PS steel material is inserted into the sheath pipe and the tension is applied thereto. Here, the filling of the empty space inside the sheath tube after the tension of the PS steel with the filler, the filler at this time is called grout material.

Generally, the grout material is cement, water, and a composition in which silica sand is mixed as necessary.

When mixing cement and water as a grout material, self-shrinkment of cement and bleeding of excess water occur, resulting in voids in the sheath pipe, which causes corrosion of the PS steel, which leads to prestress. Several problems occur in series, such as the occurrence of defects in the concrete and a reduction in the service life.

Therefore, it is common to add various admixtures to the grout material which mixed cement and water, and to manufacture a composition. Here, the quality of the grout material and the like vary depending on the components of the admixture and the compounding ratio thereof, and in order to improve the quality of the prestressed concrete, it is necessary to improve the admixture.

The present invention is to a grout material in which cement and water are mixed. By mixing components and admixtures with optimized mixing ratios, the pot life of the grout material is increased, fluidity is prevented, bleeding is suppressed, and the grout composition in the prestressed concrete sheath tube can be densely packed. It relates to a grout composition for filling the prestressed concrete sheath pipe.

The present invention, in order to solve the above problems, corresponds to 0.005 to 0.01 parts by weight of 100 parts by weight of the cement in the grout material mixed with water and cement at a water cement ratio (W / C) of 0.30 to 0.32 In one embodiment, a grout composition for filling a prestressed concrete sheath tube, in which an admixture is added, is provided.

In particular, in one embodiment, the admixture is, 50 to 80% by weight of the filler in the total amount of 100% by weight; Polycarboxylic acid-based fluidizing agent 15 to 30% by weight; 0.1-1.00% by weight of nonmetallic gas expander; Thickener 0.1 to 1 wt%; And 1 to 5 wt% of an antifoaming agent.

W / C

Generally, in the field of using cement mixtures, the water cement ratio is Refers to the weight ratio of water to cement, denoted W / C.

In the grout composition of the above embodiment, the W / C is limited to 0.30 to 0.32 (ie 30 to 32%), for example 0.30 to 0.31 (ie 30 to 31%). When satisfying this range, even if the working time is increased, fluidity is maintained, bleeding is suppressed, and filling and durability of the grout composition for filling the prestressed concrete sheath pipe can be provided.

However, when the upper limit of the W / C range, that is, when the W / C of the grout composition is more than 32%, shrinkage and bleeding may occur, and voids in the sheath tube may occur. On the other hand, when it is less than the said lower limit, ie, when the W / C of grout composition is less than 30%, workability | operativity falls and sufficient pot life is not secured, and there exists a problem that filling of a sheath pipe | tube becomes poor. This is supported by the embodiments described below.

However, in the grout composition of the embodiment, in addition to the W / C range, it is necessary to consider other components to be blended. Hereinafter, the other components constituting the grout composition of the embodiment will be described in detail.

Nonmetallic Gas Inflator

The non-metallic gas expander has an advantage of suppressing overexpansion and lowering of compressive strength of the grout composition as compared with generally known metal expanders.

Specifically, in the case of the metal-based expander, it is oxidized by reacting with water, and at the same time has a principle of generating gas and causing expansion. However, there is a risk of corroding reinforcing steel by oxidation, and if a small amount is overinjected, there is a problem of causing over-expansion to lower the compressive strength.

On the other hand, in the case of the non-metallic gas expander, since the non-metallic material and the non-metallic material have a principle of causing expansion by reacting with each other, there is no fear of corroding the reinforcing bar does not cause over-expansion, nor does it lower the compressive strength, The problem of the metal-based expansion agent can be solved.

More specifically, in the above embodiment, the nonmetallic gas expanding agent may be used in an amount of 0.1 to 1.00% by weight in 100% by weight of the total admixture. When this range is satisfied, the above-described properties may appear, and may be combined with other components to exhibit synergistic effects.

Examples of the non-metallic gas expander include hydrazinium sulfate, cooper (II) carbonate (CuCO ₃ ), and the like. However, this is only an example, and the above embodiment is not limited thereto.

Polycarboxylic Acid Fluidizing Agent

The polycarboxylic acid-based fluidizing agent can improve the bleeding of the grout composition by reducing the amount of water while improving the grouting operation time by lowering the dripping time, compared to the generally known naphthalene-based fluidizing agent.

Specifically, in the case of the naphthalene-based fluidizing agent, due to Na ₂ SO ₄ constituting the naphthalene, the pot life is excessively reduced, thereby causing a problem that the grouting must be completed within a short time.

On the other hand, the polycarboxylic acid-based fluidizing agent, the non-ionic ethanol dioxin component generates fluidity. More specifically, the ethanol dioxin component is stuck around the cement particles to drop between the particles and the particles, thereby generating fluidity, thereby solving the problem of the naphthalene-based fluidizing agent.

More specifically, in the above embodiment, the polycarboxylic acid-based fluidizing agent may be used in 15 to 30% by weight of the total amount of the admixture 100% by weight. When this range is satisfied, the above-described properties may appear, and may be combined with other components to exhibit synergistic effects.

The polycarboxylic acid-based fluidizing agent is not particularly limited as long as it is a commercially available polycarboxylic acid-based fluidizing agent.

Filling

The filler may include silicon dioxide (SiO ₂ ).

For example, the filler may be quartz sand containing 96 to 98% by weight of silicon dioxide (SiO ₂ ) and the balance of unavoidable impurities. Here, the impurities may be unavoidably mixed in the processing place in the case of natural silica sand and in the case of artificial silica sand.

In the case of using the quartz sand, compared to the ultra-fine particle filler generally made of silicon dioxide (SiO ₂ ) itself, the fluidity is improved.

Specifically, in the case of the ultrafine particle filler made of silicon dioxide (SiO ₂ ) itself, due to the ultrafine particle characteristics, there was a problem of increasing the viscosity of the composition and lowering the fluidity.

Therefore, while the silica, the silicon dioxide (SiO ₂₎ itself to large particles compared to the ultra-fine particle filler consisting of only, for example because of a particle diameter of 0.15 to 0.09 mm, wherein the silicon dioxide (SiO ₂₎ ultrafine particles consisting of only itself It can solve the problem of filler.

More specifically, in one embodiment, the filler in the total amount of the admixture 100% by weight, the filler may be used in 50 to 80% by weight. When this range is satisfied, the above-described properties may appear, and may be combined with other components to exhibit synergistic effects.

Thickeners and Silicone Defoamers

In one embodiment, 0.1 to 1.00% by weight of a thickener in 100% by weight of the total admixture; 1.00 to 5.00% by weight silicone antifoaming agent; Or mixtures thereof. When this range is satisfied, the above-described properties may appear, and may be combined with other components to exhibit synergistic effects.

The thickener may be added to the grout composition of the embodiment to exhibit water holding properties. This property can be usefully expressed when a powder having a viscosity of 20,000 to 30,000 cps is used as the thickener.

Examples of the thickeners include PEC (poly ethyl cellulse), HPMC (Hydroxypropyl Methyl Cellulse), MC (Methyl Cellulse), GUM (wellangum) and the like. However, this is only an example, and the above embodiment is not limited thereto.

On the other hand, the silicone-based antifoaming agent can be added to the grout composition of the embodiment, to suppress bubbles generated at the beginning of the blending. Examples of such silicone antifoaming agents include anionic antifoaming agents, nonionic antifoaming agents, cationic antifoaming agents and the like. Here, the anionic antifoaming agent, nonionic antifoaming agent, cationic antifoaming agent and the like can be selected from materials generally known in the art.

In addition, additives such as retarders, crudes and the like may be added to the grout composition of the above embodiment. However, this is only an example, various additives known in the art may be added to the grout composition of the above embodiment, and the compounding amount of the additives may also be controlled in an amount known in the art.

Properties

As described above, the grout composition of the embodiment may maintain fluidity, suppress bleeding, and improve other physical properties even when the working time is increased.

Hereinafter, the improved physical properties of the grout composition of the embodiment will be described.

In the grout composition of the above embodiment, the drop time according to KS F 2432 may be 20 seconds or less, for example, 13 seconds or less. This, according to the W / C control, the hydration reaction of the cement particles and water may be implemented, which may affect the dripping time.

The grout composition of the embodiment may have a bleeding ratio according to KS F 2433 of 1% or less, such as 0.5% or less or 0.2% or less. This, according to the use of the polycarboxylic acid-based fluidizing agent, can reduce the amount of water used in the cement, may affect the amount of bleeding.

In one embodiment, the grout composition may have an expansion ratio of 3.0% or less, such as 2.4% or less or 0.2% or less, according to KS F 2562. This, according to the use of the non-metal-based expansion agent, the bubble generation mechanism may be properly implemented, which may affect the expansion rate increase in the dripping time.

In one embodiment, the grout composition may have a compressive strength of 20 MPa or more in 3 days, according to KS F 2405. Furthermore, according to KS F 2405, the compressive strength of 28 days may be 40 MPa, for example 45 MPa or more. This may be due to the use of the non-metallic gas expander, the gas generation mechanism is properly implemented, the overall volume is expanded, affecting the compressive strength.

The grout composition of the one embodiment, according to KS A 5101, may pass through a sieve having a body size of 2 mm or less. This may be due to the use of the sieve analysis method.

The grout composition of this embodiment may have an initial diffusion grout diameter of at least 140 mm, such as at least 210 mm or at least 250 mm, as measured according to European standards EN 445 and EN 447. This, according to the use of the fluidizing agent, the flowability of the cement may be improved, which may affect the dripping time.

In one embodiment, the grout composition may have a diffusion grout diameter of 140 mm or more, for example, 198 mm or more or 220 mm or more after 30 minutes as measured according to European Standards EN 445 and EN 447. This, according to the use of the fluidizing agent, the flowability of the cement may be improved, which may affect the dripping time.

In one embodiment, the grout composition may have a brittle time according to KS L 5108 of 6 hours or more, such as 6 hours 50 minutes or more. In addition, the termination time according to KS L 5108 may be 9 hours or more, such as 9 hours 40 minutes or more. This may be that, depending on the fluidizing agent and water use, a material separation mechanism is implemented, affecting the dripping time.

As described above, according to one embodiment of the present invention, the physical properties and workability of the grout composition for prestressed concrete are improved, and the stability of the product including the grout composition for filling the prestressed concrete sheath pipe is secured. As a result, defects in the product can be reduced.

Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the following examples are only for illustrating the present invention, and the scope of the present invention is not limited thereto.

Examples and Comparative Examples

The components used in each of the compositions of Examples 1 to 4 and Comparative Examples 1 to 4 are as follows.

1) Cement: Class 1 ordinary portland cement

 Comparative Examples 1-4: Ssangyong Ceremony, bulk carry-in on March 9, 2017

 Examples 1-4: Ssangyong Cement, April 3, 2017 bulk import

2) Expanding agent: powder material temperature: 20 ± 1 ℃

 Comparative Example 1: Horselock Dubai (consumption CХ6%)

 ㆍ Comparative Examples 2-4: Horselock Korea, (consumption CХ1%)

 Examples 2 to 4: Cebex Cable grout (manufacturer: Horselock Korea, usage amount CХ1%)

3) Number of use: tap water

Comparative Examples 1 to 3: 20 ° C

Comparative Example 4: 12.8 ° C

Examples 1-4: 20 ° C

4) Filling material

SiO ₂ (manufacturer: Sungshin, brand name: # 8, particle size: 0.15 ~ 0.09mm)

5) Glidant

Comparative Examples 1 to 4: PNS (manufacturer: Gyeonggi Chemical, trade name: Powercon 100),

Examples 1 to 4: PC (manufacturer: Sannovco)

6) Thickener

ㆍ gum, powder material temperature 19 ~ 21 ℃ (manufacturer: Wonyoung industry, brand name: IWY-1000)

5) Defoamer

ㆍ silicon

Using the above components, in the formulations described in Table 1 below, each of the compositions of Examples 1-4 and Comparative Examples 1-4 was prepared.

Specifically, each of the compositions of Examples 1 to 4 and Comparative Examples 1 to 4 mixes a grout material component composed of cement and water, and a admixture component composed of a filler, a fluidizing agent, a thickener, an expanding agent, and an antifoaming agent, and then a hand mixer. Was prepared by mixing for 1 minute and 30 seconds at 850 RPM and 16 mm conditions at no load.

Admixture Grout After mixing
grout
Temperature Filling Glidants Thickener Inflator Antifoam cement water w / c ratio Comparative Example 1 9 11 0.1 0.1 0 2000 6800 34% 22.2 ℃ Comparative Example 2 9 11 0.1 0.1 0 2000 660 33% 25.8 ℃ Comparative Example 3 9 11 0.1 0.1 0 2000 700 35% 23.7 ℃ Comparative Example 4 9 11 0.1 0.1 0 2000 680 34% 18.2 ℃ Example 1 14 6 0.1 0.04 0.1 2000 600 30% - Example 2 14 6 0.1 0.04 0.1 2000 640 32% - Example 3 14 6 0.1 0.04 0.1 2000 600 30% 22.7 ℃ Example 4 14 6 0.1 0.04 0.1 2000 620 31% 24.6 ℃

Test Example  One ( Yuha  Time measurement)

1) test method

According to KS F 2432, the funnel pedestal with the surface moistened with water was erected vertically, and the pouring time after pouring mortar was measured. At this time, the mortar was completely filled to the top of the funnel to proceed with the test.

2) Judging Criteria

For smooth injection, it was determined to be "satisfied" when the dripping time was less than 21 seconds, especially "satisfied" when it was less than 13 seconds.

3) Test result

The test results are reported in Table 2 below.

division Descent time (seconds) Judgment Comparative Example 1 (W / C: 34%) 22 - Comparative Example 2 (W / C: 33%) 18 satisfied Comparative Example 3 (W / C: 35%) 12 very good Comparative Example 4 (W / C: 34%) 11 very good Example 1 (W / C: 30%) 20 satisfied Example 2 (W / C: 32%) 14 satisfied Example 3 (W / C: 30%) 20 satisfied Example 4 (W / C: 31%) 13 very good

In Examples 1 to 4 supplementing the fluidity of the expanding agent, all of the quality criteria within 21 seconds were satisfied, and the fluidity showed good results. However, since the fluidity of the swelling agent was supplemented in the Examples 1 to 4 but the viscosity was increased, when the W / C ratio was controlled to 31 to 32% (Examples 2 and 4), it was within 13 seconds of the descent time, which is a site presentation criterion. A satisfactory result was obtained.

Test Example 2 (Expansion and Bleeding Rate Test)

1) test method

According to KS F 2562, the strand was fixed in the center of the transparent cylindrical tube, the mixed material was filled to a certain height, the top was sealed to prevent moisture evaporation, and the initial height and time was recorded.

Specifically, the height of the grout and the amount of bleeding were measured at intervals of 3 hours and 24 hours, and the expansion rate and the bleeding rate were calculated.

* Final bleeding = hw / ho × 100

* Expansion rate = (hg-ho) / ho × 100

(hg: height of final grout, ho: height of initial grout, hw: height of final bleeding occurrence)

2) Judging Criteria

"Satisfaction" was determined when the expansion rate was 10% or less and the bleeding rate was 1.4% or less, particularly when the expansion rate was 10% or less and the bleeding rate was 0.5% or less.

3) Test result

Test results are reported in Table 3 below.

division % Expansion % Bleeding Judgment Comparative Example 1 (W / C: 34%) 1.7 0.6 satisfied Comparative Example 2 (W / C: 33%) 3.0 0 satisfied Comparative Example 3 (W / C: 35%) 1.0 0.1 very good Comparative Example 4 (W / C: 34%) 0 0.24 very good Example 1 (W / C: 30%) 2.4 0.2 very good Example 2 (W / C: 32%) 1.5 1.4 satisfied Example 3 (W / C: 30%) 0.2 0.5 very good Example 4 (W / C: 31%) 0 0.5 very good

In Comparative Examples 1 to 4, all expanded rapidly within 2 hours, and almost no expansion proceeded after 2 hours. In addition, in Comparative Examples 1 to 4, all of the bleeding did not occur after 3 hours, and the values recorded in Table 3 are the result values measured after 3 hours. Specifically, the bleeding generated from 3 hours to 24 hours was 0%, and after 12 hours or more, it was confirmed that all of the bleeding evaporated.

On the other hand, in all of Examples 1 to 4, the expansion did not proceed almost after 4 hours, the bleeding occurred until the elapse of 7 hours it was confirmed that all the bleeding evaporated after 24 hours.

The expansion ratio satisfies the criterion of determination (less than 10%) in all samples tested, and the bleeding was slightly increased in Examples 1 to 4 compared to Comparative Examples 1 to 4, but the W / C ratio was 31 to 32%. When controlled by (Examples 2 and 4), excellent results with a bleeding rate of 0.5% or less were obtained.

Test Example 3 (Strength Test)

1) test method

In accordance with KS L 5105, three 50 × 50 × 50 (mm) cubic specimens were tested according to KS F 2405.

2) Judging Criteria

When the three-day compressive strength result was 20 MPa or more, it was determined as "satisfied".

3) Test result

The test results are reported in Table 4 below.

division Compressive strength (MPa) Rebirth (Sun) Judgment Comparative Example 1 (W / C: 34%) 54.9 3 satisfied Comparative Example 2 (W / C: 33%) 48.0 3 satisfied Comparative Example 3 (W / C: 35%) 54.5 3 satisfied Comparative Example 4 (W / C: 34%) 53.8 3 satisfied Example 1 (W / C: 30%) 63.8 3 satisfied Example 2 (W / C: 32%) 62.0 3 satisfied Example 3 (W / C: 30%) 46.8 3 satisfied Example 4 (W / C: 31%) 45.0 3 satisfied

In Comparative Examples 1 to 4 and Examples 1 to 4, the measured three-day intensity can confirm that all samples express more than the reference intensity. On the basis of in situ field conditions, the 28-day compressive strength results need to be satisfied at least 20 MPa, which is inferred to be both Comparative Examples 1-4 and Examples 1-4.

Test Example 4 (sieve test)

1) test method

In accordance with KS A 5101, the compounded grout (1 liter) was passed through a sieve with a body size of 2 mm or less to check whether there was a lump on the sieve (see EN 445, EN 447).

2) Judging Criteria

If there is no lump left on the sieve, it is determined as "satisfied".

3) Test result

As a result of the test, in Comparative Examples 1 to 4 and Examples 1 to 4, there was no lump left on the sieve and it was determined to be "satisfied".

Test Example 5 (Grow Diffusion Method)

1) test method

In accordance with EN 445 and EN 447, the mold mold (φ: 39 mm, h: 60 mm) is placed on a horizontal plate and the grout is injected to the upper part inside the mold. The mold was lifted and the grout spread for 30 seconds to measure the diameter in the transverse and longitudinal directions. It was retested after 30 minutes with grout mixed.

2) Judging Criteria

When the initial diffusion grout diameter was 140 mm or more and the diffusion grout diameter was 140 mm or more after 30 minutes, it was determined as "satisfied".

3) Test result

The test results are reported in Table 5 below.

division Early 30 minutes later Judgment Comparative Example 4 (W / C: 34%) 230 mm 120 mm dissatisfaction Example 1 (W / C: 30%) 210 mm 214 mm satisfied Example 2 (W / C: 32%) 230 mm 235 mm satisfied Example 3 (W / C: 30%) 215 mm 198 mm satisfied Example 4 (W / C: 31%) 250 mm 220 mm satisfied

In the case of a comparative example, only the comparative example 4 was tested. Although the initial diffusion grout diameter of Comparative Example 4 was 230 mm, the criterion was satisfied, but after 30 minutes, the diffusion grout diameter was 120 mm. This means that the liquidity was initially high, but the fluctuation of the liquidity over time is large. Specifically, in the case of Comparative Example 4, when about 10 minutes passed without mixing, the fluidity was significantly reduced.

In the case of Examples 1 to 4, unlike Comparative Example 4 in which the fluidity was remarkably inferior with time, the results satisfying the judgment criteria were obtained in all cases. In other words, the fluidity was not lost even if it was not continuously mixed.

Test Example 6 (Condensation Time)

1) Test Method and Judgment Criteria

In accordance with KS L 5108, the test specimen is placed in a humid place for 30 minutes after molding, and then tested until the penetration of 25 mm is achieved with 1 mm needle every 10 minutes. When the needle penetrated 0.5 mm was terminated.

2) test result

The test results are reported in Table 6 below.

division Candle Termination Judgment Comparative Example 4 (W / C: 34%) 5 hours 30 minutes 6 hours dissatisfaction Example 3 (W / C: 30%) 6 hours 50 minutes 6 hours 40 minutes satisfied Example 4 (W / C: 31%) 7 hours 30 minutes 7 hours 10 minutes satisfied

In comparison to Comparative Example 4, in Examples 3 and 4, It was found that the setting time was delayed slightly (about 1 hour 30 minutes).

Synthesis

The difference between the composition of the comparative example and the embodiment is a difference in the fluidizing agent component, it was confirmed through the experiment that the Example can ensure the workability in the state of the water-cement ratio of the grout composition than the comparative example.

The fluidizing agent used in the comparative example is naphthalene-based, and due to the characteristics of such naphthalene-based fluidizing agent, the grout diffusion test showed a severe change over time after 30 minutes, and it was confirmed that the fluidity decreased significantly over time. This can be attributed to the difficulty of infusion with time-dependent changes in field work.

In addition, in the case of the comparative example, the condensation proceeds than the embodiment, which is not satisfied with the criterion, the faster the condensation time can cause a variety of problems in the field work, such as pipe clogging, difficulty in injection.

In order to satisfy the test results of the comparative example, the composition was changed as in Example to secure the grout quality, and the experimental result was confirmed that the example was more satisfactory than the comparative example.

Specifically, in Examples 1 to 4 using polycarboxylic acid-based fluidizing agents instead of naphthalene-based fluidizing agents, fluidity was improved. In particular, when the ratio of W / C was controlled to 30 to 31% in Examples 1 to 4, the results satisfying most of the test items were obtained.

Overall, by controlling the flowability of the grout composition for filling inside the prestressed concrete sheath pipe, and also the ratio of W / C at the same time, to increase the pot life of the grout material, to secure the fluidity, to suppress the bleeding (bleeding), It can be seen that the grout composition in the concrete sheath tube can be densely packed.

Claims (17)

Water and cement in a water cement ratio (W / C) of 0.30 to 0.32, and 0.005 to 0.01 parts by weight of admixture based on 100 parts by weight of the cement,
The admixture is, 50 to 80% by weight of quartz sand-based filler in a total amount of 100% by weight; Polycarboxylic acid-based fluidizing agent 15 to 30% by weight; 0.1-1.00% by weight of nonmetallic gas expander; 0.1 to 1 wt% of gum thickeners; And 1 to 5 wt% of the silicone-based antifoaming agent.
A grout composition for filling the prestressed concrete sheath pipe.
The method of claim 1,
The non-metallic gas expanding agent, hydrazinium sulfate (hydrazinium sulfate) hydrazinium sulphate, and comprises at least one or more selected from the group comprising cooper (II) carbonate (CuCO ₃ ),
A grout composition for filling the prestressed concrete sheath pipe.
delete The method of claim 1,
The gum-like thickener, the viscosity is 20,000 to 30,000 cps,
A grout composition for filling the prestressed concrete sheath pipe.
The method of claim 4, wherein
The gum thickener is a powder having the viscosity,
A grout composition for filling the prestressed concrete sheath pipe.
delete The method of claim 1,
The silicone-based antifoaming agent, including an at least one selected from the group consisting of an anionic antifoaming agent, a nonionic antifoaming agent, and a cationic antifoaming agent,
A grout composition for filling the prestressed concrete sheath pipe.
The method of claim 1,
The grout composition is,
The descent time according to KS F 2432 is 13 seconds or less,
A grout composition for filling the prestressed concrete sheath pipe.
The method of claim 1,
The grout composition is,
Bleeding ratio according to KS F 2433 is less than 1%,
A grout composition for filling the prestressed concrete sheath pipe.
The method of claim 1,
The grout composition is,
Expansion rate according to KS F 2562 is less than 3.0%,
A grout composition for filling the prestressed concrete sheath pipe.
The method of claim 1,
The grout composition is,
According to KS F 2405, the compressive strength of 3 days of at least 45 MPa,
A grout composition for filling the prestressed concrete sheath pipe.
The method of claim 11,
The grout composition is,
According to KS F 2405, the compressive strength of 28 days of at least 20 MPa,
A grout composition for filling the prestressed concrete sheath pipe.
The method of claim 1,
The grout composition is,
In accordance with KS A 5101, passing through a sieve having a body size of 2 mm or less,
A grout composition for filling the prestressed concrete sheath pipe.
The method of claim 1,
The grout composition is,
When measured according to EN 445 and EN 447, the initial diffusion grout diameter is at least 140 mm,
A grout composition for filling the prestressed concrete sheath pipe.
The method of claim 14,
The grout composition is,
When measuring in accordance with EN 445 and EN 447, the diameter of the diffusion grout after 30 minutes is at least 140 mm,
A grout composition for filling the prestressed concrete sheath pipe.
The method of claim 1,
The grout composition is,
The final time according to KS L 5108 is 7 hours or less,
A grout composition for filling the prestressed concrete sheath pipe.
The method of claim 16,
The grout composition is,
The termination time according to KS L 5108 is 8 hours or less,
A grout composition for filling the prestressed concrete sheath pipe.