JPH07267700A - Two-pack grout composition - Google Patents

Abstract

PURPOSE:To obtain a two-pack grout composition excellent in resistance to seawater. CONSTITUTION:This two-pack grout composition is made up of water-glass and a cement-contg. suspension. The cement components include 3CaO.SiO2, 2CaO.SiO2, 3CaO.Al2O3, 4CaO.Al2O3.Fe2O3, and gypsum, and the weight ratio of SiO2/Al2O3 in this cement is 8--15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-part grout composition which is injected into a void formed between a construction structure and ground soil. In particular, in the shield tunnel construction, a backfill material that is injected and filled into the cavity between the ground and the segment for the purpose of preventing ground subsidence and water leakage, or a structure is built in the soft layer, and the structure is constructed by the subsidence of the soft layer. Regarding a two-component grout composition used as an injecting material filled for the purpose of ensuring the stability of a structure when a void is generated between the soil and the ground, or as a ground injecting material used for improving the ground at the seaside It is a thing.

[0002]

2. Description of the Related Art Conventionally, in tunnel construction by the shield construction method, a cavity called a tail void is generated between the excavated surface of the shield machine, that is, the ground and the segment which is the lining material. For this reason, backfilling injection has been carried out for the purpose of preventing deformation of the surrounding ground, improving the waterproofness of the tunnel, and ensuring the stability of the lining.

At present, in backfilling injection, a two-component plastic grout is mainly used because it is excellent in backfilling grout's required performance such as filling property, limited injection property (prevention of escape to the outside) and early strength development. Has become. The two-component grout is obtained by mixing a liquid A as a main injection material containing a solidifying material component typified by cement and a liquid B as a gelling agent and a plasticizer typified by water glass.

The technique of these two-component grouts is disclosed in Japanese Patent Publication No. 62-24474, Japanese Patent Publication No. 2-4634, Japanese Patent Publication No. 2-43790. By the way, the hardened body of the two-component grout, in an environment where seawater is eroded, causes the water glass component to be leached out, and magnesium hydroxide and Friedel's salt are generated by the reaction between the seawater component and the solidifying material component. However, it is said that there is a problem in long-term durability because cracks occur and expand. In addition, in the experiment conducted by the present inventor, that is, seawater resistance by artificial seawater curing of a two-component grout using blast furnace cement type B as a slag mixed system cement, which is often used in a solidifying material for backfill material. As a result of the test, it was confirmed that the seawater resistance was extremely poor.

However, in recent years, large-scale civil engineering
There is a tendency for many construction projects to be planned and started, and a grout composition having excellent seawater resistance is desired for shield tunnel construction under seawater environment.

[0006]

DISCLOSURE OF THE INVENTION An object of the present invention is to provide a glass having excellent seawater resistance.
It is to provide a eu composition. The purpose of this invention
Consists of a mixture of cement-containing suspension and water glass.
A two-part grout composition comprising:
As 3CaO ・ SiO₂, 2CaO / SiO₂, 3C
aO ・ Al₂O₃, 4CaO / Al₂O₃・ Fe₂O ₃
And gypsum, and the SiO in this cement₂
/ Al₂O₃(Weight ratio) is 8 to 15
And a two-part grout composition.

The two-part grout composition of the present invention
In the thing, (Fe₂O₃) / (3CaO ・ SiO₂
+ 2CaO / SiO₂+ 3CaO / Al₂O₃+ 4Ca
O ・ Al₂O₃・ Fe₂O₃2-4% by weight of gypsum)
It is preferable that cement is used. Also, (3C
aO ・ SiO₂) / (3CaO ・ SiO₂+ 2CaO ・
SiO₂+ 3CaO / Al₂O₃+ 4CaO / Al₂O
₃・ Fe₂O₃+ 40% by weight of gypsum), (2Ca
O / SiO₂) / (3CaO ・ SiO₂+ 2CaO ・ S
iO ₂+ 3CaO / Al₂O₃+ 4CaO / Al₂O₃
・ Fe₂O₃+ Gypsum) is 40-65% by weight of cement
It is preferably used.

[Blast furnace slag] / (3CaO.SiO)
_{2 + 2CaO · SiO 2 + 3CaO} · Al 2 O 3 + 4C
_{aO · Al 2 O 3 · Fe} 2 O 3 + gypsum + blast furnace slag) is preferably made used is added, the cement blast furnace slag to be 5 to 50 wt%. Further, it is preferable to use cement added with gypsum in an amount of 0.5 to 4.5% by weight in terms of SO ₃ in the cement.

The water glass used is SiO ₂
/ Na ₂ O (molar ratio) is preferably water glass of 3.3 to 4.0. Hereinafter, the present invention will be described in detail. The present inventor aims to obtain a guideline for developing a two-component grout having seawater resistance, and ordinary Portland cement (hereinafter referred to as N cement) and blast furnace cement B type in which N cement is mixed with about 45% by weight of blast furnace slag. (Hereafter, BB
The resistance to seawater was investigated for a hardened body of two-liquid grout using (cement) as a solidifying material.

As a result, in the case of BB cement, cracks were generated in the hardened body within a short period of only 7 days after the start of curing with artificial seawater, and it was disintegrated at the age of 3 months. The deterioration of the cured product proceeded due to the occurrence and expansion of cracks, and the softening and falling off of the portion in contact with seawater. On the other hand, in the case of N cement, a crack was generated at the age of 2 months and it collapsed at the age of 1 year, and was slightly superior in seawater resistance to BB cement. It was noted that the deterioration of the hardened body progressed mainly due to the generation and expansion of cracks, and the softening phenomenon of the hardened body seen in the case of BB cement did not occur so much.

By the way, in the erosion of the two-component cured grout by seawater, chlorine ions (Cl ⁻ ) and sulfate ions (SO ₄ ²⁻ ) contained in seawater enter the cured body, and Friedel's salt (C _It is considered that hydrates such as ₃ A · CaCl ₂ · 10H ₂ O) and ettringite (C ₃ A · 3CaSO ₄ · 32H ₂ O) are newly generated, so that the structure of the hardened body is deteriorated and expanded. N cement and BB as described above
It is understood that the initiation and expansion of cracks generated in the cement-based hardened body correspond to this.

The mechanism of erosion by seawater is well known in general cement and concrete, and Al _{2 in} cement, which is a constituent of Friedel's salt and ettringite, is well known.
If the O ₃ component is reduced, the seawater resistance will be improved. However, the two-part grout is Na ₂ O.nSi
Since water glass composed of O ₂ is used as a gelling agent, it is expected that a reaction different from general cement / concrete will occur with seawater due to the action of the Na ₂ O component which is a strong alkali. It was considered that the softening phenomenon of the portion in contact with seawater, which occurred in the hardened body using the BB cement, also corresponds to this.

Therefore, in order to obtain a two-component cured grout having seawater resistance, it is necessary to thoroughly study under the special condition that water glass is used. For this purpose, a seawater resistance test was conducted on a two-part cured grout using Portland cement with various chemical compositions as a solidifying material component. As a result, the chemical composition of the cement was SiO ₂ and Al ₂ O. Weight ratio with ₃ (SiO ₂ / Al ₂
It has been found that when O ₃ ) is increased, a two-component grout having more excellent seawater resistance can be obtained.

That is, 3CaO is used as a component of cement.
・ SiO ₂ (hereinafter, C ₃ S), 2CaO ・ SiO ₂ (hereinafter, C ₂ S), 3CaO ・ Al ₂ O ₃ (hereinafter, C
_{3 A), 4CaO · Al 2} O 3 · Fe 2 O 3 ( hereinafter, C
₄ AF) and gypsum, and the cement having a SiO ₂ / Al ₂ O ₃ (weight ratio) of 8 to 15 is used as a solidifying material, and is composed of a mixture of a suspension containing this and water glass. It was found that the two-component cured grout has excellent seawater resistance.

That is, a two-component cured grout using a cement having a small value of SiO ₂ / Al ₂ O ₃ of less than 8 is:
It was inferior in seawater resistance. In addition, SiO ₂ / Al ₂ O
Cement having a large value of ₃ exceeding 15 has a small amount of Al ₂ O ₃ component forming a liquid phase at the time of firing the cement clinker during cement production, so that the clinker does not become agglomerate but becomes fine or powdery. It was not realistic because the rotary kiln and clinker cooler could not be operated continuously and stably, which hindered cement production.

SiO ₂ / Al ₂ O ₃ is called an activity coefficient in the field of cement production. The practical limit value of this activity coefficient is empirically set to be 2.5 to 6.0, and the activity coefficient of the cement currently in practical use is as shown in [Table 1].

[0017]

[Table 1]

Here, the features of excellent seawater resistance are exhibited.
The reason was considered as follows. First, SiO₂/ Al₂
O₃By increasing the value of
Calcium silicate (C₃S and C₃
Al for S) ₂O₃The ratio of components becomes smaller
Therefore, by reacting with seawater components, Friedel salt and
Even if ngite is generated, the amount of grouting hardened is healthy.
To keep calcium silicate hydrate (C-S-H)
The deterioration of the cured product or expansion cracks
It was understood that it is possible to prevent deterioration due to occurrence of.

Also, a hydrated product of calcium silicate
Calcium hydroxide Ca (OH) ₂With chloride ion
Highly soluble calcium chloride CaCl₂
, And the dissolved grout becomes porous,
It may deteriorate. However, in the present invention
For the cement used, SiO₂/ Al₂O₃Is high
C₃C for S₂The amount of S is increasing and C₂
S is C₃Less calcium hydroxide is produced than S
Therefore, it was understood that the deterioration phenomenon is unlikely to occur.

Further, C ₂ S is a compound having the highest chemical resistance among cement compounds, and even in a two-component grout hardened product which is affected by Na ₂ O which is a strong alkali by using water glass, It was understood that hydration proceeded so that a stable hardened body could be formed. Incidentally, the SiO ₂ / Al ₂ O ₃ (weight ratio) of the cement is preferably 8 to
13, more preferably 9-12, and even more preferably 9.
5 to 11.5.

As a result of further research, SiO ₂ / Al
₂ O ₃ is not only said to be 8 to 15, but (Fe ₂ O ₃ )
_{/ (C 3 S + C 2} S + C 3 A + C 4 AF + gypsum) is 2
It has also been found that when 4% by weight (more preferably 2-3% by weight) of cement is used, the seawater resistance of the two-part cured grout is further improved. That is, when cement having a large value of the above ratio exceeding 4% by weight was used, it was recognized that the seawater resistance of the two-component cured grout was inferior. On the other hand, a cement with a small value of less than 2% by weight has a small amount of Al ₂ O ₃ component, but also has a small amount of Fe ₂ O ₃ component, which has a role of forming a liquid phase during clinker firing, together with Al ₂ O ₃ , so that the cement content is too small. The reaction of forming compounds, especially C ₃ S, deteriorates and the amount of unreacted CaO in the clinker increases,
It was difficult to produce good quality cement.

Further, (C ₃ S) / (C ₃ S + C ₂ S + C ₃
A + C ₄ AF + gypsum) (hereinafter, C ₃ S ratio) is 20 to 4
0% by weight (desirably 23 to 33% by weight), (C
₂ S) / (C ₃ S + C ₂ S + C ₃ A + C ₄ AF + gypsum)
Cement having a C ₂ S ratio of 40 to 65% by weight (preferably 50 to 65% by weight) is preferable as a solidifying material constituting a backfill material (two-component cured grout) for shield tunnel construction. Is based on the following reasons.

In the backfilling injection in the shield tunnel construction, it is desired that the grout does not flow out of the tail void, that is, it does not leak to the face and unnecessarily escape to the surrounding ground. For this reason, it takes 5 to 20 seconds. The degree of gelation time is used as a guide. Further, after the tail void is filled with grout, it is preferable that the grout develops an early strength of a certain level or more until the next shield excavation, and the strength reaches a level equivalent to or higher than that of the natural ground as quickly as possible. For this reason, 0.2 hour intensity
The standard is early strength development of about 1 kgf / cm ² . The gelation time means the time from the mixing of the liquids A and B until the grout loses its fluidity.

Under the above-mentioned conditions, the amount of C ₃ S and C ₂ S in the cement used as the solidifying material component was varied and examined. As a result, the C ₃ S ratio was 20 to 40% by weight,
When the cement having a C ₂ S ratio of 40 to 65% by weight was used, the requirements for gelation time of about 5 to 20 seconds and the requirement of 1-hour strength were satisfied. If the C ₃ S ratio exceeds 40% by weight and the C ₂ S ratio is less than 40% by weight, the C having a slow reaction rate in a small amount of liquid phase components during clinker firing.
_Since the proportion of ₃ S is excessive, the amount of unreacted CaO increases, making it difficult to produce high-quality cement. or,
The C ₃ S ratio is less than 20% by weight and the C ₂ S ratio is 65%.
When the content exceeds 10% by weight, the gelling time of grout exceeds 20 seconds and the strength for 1 hour often falls below 0.2 kgf / cm ² .

The Ca ²⁺ ion supplied from the cement into the grout contributes to the gelation reaction between the cement and water glass, but C ₂ S supplies more Ca ²⁺ ion than C ₃ S. Since the amount of this compound is small, the C ₃ S ratio is 20.
If cement with a C ₂ S ratio of less than 65% by weight and a C ₂ S ratio of more than 65% by weight is used, Ca ²⁺ ions will be deficient, and the speed and amount of gelation reaction will decrease, so that a gelling time suitable for shield work and It was understood that early strength could not be obtained, and in order to comply with this, the proportion of C ₃ S in cement must be 20% by weight or more.

Next, a seawater resistance test was conducted on a two-component hardened grout using blast furnace slag obtained by adding blast furnace slag to the above-mentioned cement as a solidifying agent. When it was set to -50% by weight, higher strength development was exhibited by curing in seawater, and seawater resistance was also improved. The mixing ratio of the blast furnace slag is particularly preferably 15 to 45% by weight.

Such a high-strength-developing two-component grout can be used, for example, in a case where a high strength is required by the injection material filled in the cavities between the high-strength concrete structure and the ground soil or the ground after improvement. It is used for such purposes. If the mixing ratio of the blast furnace slag exceeds 50% by weight, cracks occur in the cured body during curing in seawater, the strength of the cured body also decreases, and the seawater resistance deteriorates. If the mixing ratio is less than 5% by weight,
The effect of addition was not significant.

On the other hand, as a comparative example, N cement was used as a blast furnace powder.
Two liquids using blast furnace cement mixed with lag as solidifying material
Cured grout will crack in a short period of time during seawater curing.
When N cement is used alone by
Seawater resistance worsened rather than. And the former deterioration
Not only the occurrence and expansion of cracks, but also the contact with seawater.
Progressed by softening and falling. This is understood as
It was Blast furnace slag has more Al than N cement₂O
₃Contains ingredients. Two-component grout with water glass
The cured product is a strong alkali Na₂Under the action of O
Therefore, the hydration reaction of cement and blast furnace slag is accelerated,
N cement Al₂O₃Sometimes the content of ingredients is high,
Al in hardened liquid phase³⁺I think that the ion concentration will be extremely high
available. Then, due to the intrusion of seawater components, the hardened tissue
The amount of Al ³⁺Ions in the cured body
Without being fixed as a stable hydrate to, for example, binding
It becomes a weak aluminum hydroxide gel, causing a softening phenomenon.
Is expected.

On the other hand, since the cement used as the base material of the present invention has a small content of Al ₂ O ₃ component, the Al ³⁺ ion concentration in the liquid phase does not become so high even if blast furnace slag is mixed, Al ³⁺ ions were considered to be fixed as a hydrate in the cured product. It was understood that the hydration of blast furnace slag consumes calcium hydroxide, which is a hydrate of calcium silicate, and the cured product has excellent seawater resistance.

The cement used in the two-component grout composition of the present invention may be produced by crushing clinker, blast furnace slag and a suitable amount of gypsum separately or after appropriately combining them and then mixing them. Alternatively, an appropriate amount of gypsum may be added to the clinker and the blast furnace slag, and the mixture may be crushed and manufactured. In the present invention, the amount of gypsum added is set to 0.5 to 4.5% by weight in terms of SO ₃ in cement for the following reason.

Gypsum is indispensable for normalizing the setting and hardening of cement. Usually, gypsum is added in an amount of 0.5 to 2.5% by weight in terms of SO ₃ in cement. There is. Then, since it contains originally clinker from 0.5 to 1.0 wt% of SO ₃ minutes, SO ₃ content in the cement 1. has about 5 to 3.5 wt%. Therefore, also in the present invention, the lower limit of the amount of gypsum added is the S in cement.
It was set to 0.5% by weight in terms of O ₃ .

On the other hand, it is known that the seawater resistance of a general cement hardened product is better when the amount of SO ₃ in cement, that is, the amount of gypsum added, is large to some extent. In the present invention, even if the amount of SO ₃ in the cement is about 2% by weight, the two-component grout using the same shows sufficiently good seawater resistance, but if the amount of SO _{3 in} the cement increases, It is expected that the seawater resistance of the two-pack grout will be further improved. However, even if the maximum amount of SO ₃ in cement according to Japanese Industrial Standard is large, it is 4.5% by weight, so 4.5% by weight was selected as the upper limit.

Further, as a result of further study, the water glass used for the two-component grout has a molar ratio of SiO ₂ and Na ₂ O (SiO ₂ / Na ₂ O molar ratio) of 3.3 to 4.0. It was found that the gelation time is shorter than that in the case where the SiO ₂ / Na ₂ O molar ratio is 3.0, the early strength is improved, and the seawater resistance is good. Became.

If the SiO ₂ / Na ₂ O molar ratio is less than 3.3, the above performance improving effect is small. Hereinafter, the present invention will be described with reference to specific examples.

[0035]

EXAMPLE Portland cement having a chemical composition and a compound composition (according to the Borg formula) shown in [Table 2] obtained by a manufacturing facility of a cement factory and having a fineness of 3250 to 3450 cm ² / g was used as a solidifying material component. A seawater resistance test was performed on the liquid grout cured product.

[0036]

[Table 2]

The two-part grout was prepared based on the formulation shown in Table 3.

[0038]

[Table 3]

The suspension of the liquid A was prepared by first dispersing the auxiliary material in water, dissolving the retarder, and finally adding and mixing cement so that the finished amount was 5 L. . A 200 mesh sieve residue 6.5% bentonite produced in Gunma prefecture was used as an auxiliary material, a sodium polyhydroxycaproate 33 W / V% aqueous solution was used as a retarder, and tap water was used as water.

Further, the liquid B contains 22.4% of SiO ₂ and N
A water glass having an a ₂ O amount of 7.7% and a SiO ₂ / Na ₂ O molar ratio of 3.0 was used. For the grout cured product for testing, the liquid A and the liquid B were weighed in separate containers so that the total amount of both was 1400 mL, and the mixing of both was quickly repeated.
JIS 2 to 3 seconds before the gelation time measured in advance
It was prepared by pouring it into a mold for strength test of R 5201 “Physical test method for cement” (specimen size: 4 × 4 × 16 cm). The grout placed in the mold was immediately sealed with a polyvinylidene chloride film, and after 1 hour of sharpening,
The specimens were demolded at a material age of 1 day, and artificial seawater curing and underwater curing for comparison were started. The preparation and curing of the specimen were carried out in a thermostatic chamber at 20 ° C.

For the artificial seawater for curing, the Ka shown in [Table 4] is used.
The tap water was used as the water prepared by the formulation of lle. Each curing water was replaced with new one every 2 weeks until the age of 3 months and thereafter every 1 month. The results of the uniaxial compressive strength test of the specimen at the specified age [Table 5]
Shown in. In the table, the state of crack generation of the test piece is indicated by Δ or ×, and when the test piece loses its automorphism and collapses when water is drawn, it is indicated as “collapse”.

[0042]

[Table 4]

[0043]

[Table 5]

According to this, the two-part hardened grout using the cement of Examples 1 and 2 as the solidifying material has a slightly lower compressive strength value by artificial seawater curing than in the case of underwater curing. However, the strength continued to increase up to 1 year old, and it showed excellent seawater resistance. The required compressive strength of the two-component grout for a long period of time is, for example, about 30 kgf / cm ² for a backfill material for shield tunnel construction.
As described above, the strengths of Example 1 and Example 2 are
Even in seawater curing, it is well above this value.

On the other hand, the hardened body using the N cement of Comparative Example 1 as the solidifying material cracked at the age of 2 months in the artificial seawater, and thereafter the crack expanded and the strength decreased, and the age of 1
It had collapsed over the years, and had poor seawater resistance. Also, in the case of the sulfate-resistant Portland cement (SRC cement) of Comparative Example 2, cracking occurred at the age of 3 months, the strength decreased thereafter, and the seawater resistance was poor.

Next, a breakdown of the four types of cements having different compound compositions (according to the Borg formula) obtained by the manufacturing equipment of the cement factory is shown in [Table 6], and the two-component grout gel using them as a solidifying material is shown. The aging time and the early uniaxial compressive strength are shown in Table 7 as Examples 3 to 6. The fineness of the cement was 3250 to 3450 cm ² / g, and the materials used for the two-component grout except the cement, the compounding and preparing method of the grout, and the manufacturing method of the cured product were the same as in Example 1.

[0047]

[Table 6]

[0048]

[Table 7]

According to this, the larger the amount of C ₃ S in the cement, that is, the smaller the amount of C ₂ S, the shorter the gelation time and the early strength of 1 hour and 3 hours increases. The performance of the grout that is suitable for the backfill material for shield tunnel construction is that the gelling time is about 5 to 20 seconds, as described above.
The time strength is about 0.2 to 1 kgf / cm ^2, and the amount of C ₃ S in the cement is 20 to 40% by weight and C ₂ S.
It can be seen that if the amount is 40 to 65% by weight, this is satisfied.

Further, blast furnace cement prepared by mixing Portland cement of Example 1 with commercially available blast furnace slag powder having a fineness of 4,520 cm ² / g and an SO ₃ amount of 2.0% by weight of 20% and 40% by weight. [Table 8] shows the results of the seawater resistance test of the two-component cured grouts using as a solidifying agent, as Examples 7 and 8. For comparison, the test results in the case of a blast furnace cement prepared by mixing N cement manufactured by Chichibu Cement Co., Ltd. with the slag described above are Comparative Example 3 and Comparative Example 4.
Show as. Materials other than the cement used for the two-component grout, the compounding and preparing method of the grout, the manufacturing method of the cured product, and the curing method with artificial seawater were the same as in Example 1.

[0051]

[Table 8]

According to this, when N cement is mixed with blast furnace slag, no matter whether the mixing ratio of slag is 20% by weight or 40% by weight, the specimen for artificial seawater curing is: Cracks had already occurred at the age of 1 month and collapsed at the age of 3 months, resulting in poor seawater resistance. On the other hand, in the products of the present invention shown in Examples 7 and 8, the strength continued to be enhanced even by curing in seawater, and the strength value itself was also the result of Example 1 in which the blast furnace slag was not added. It is clear that it increases as the amount of blast furnace slag added increases. That is, it is possible to produce a two-component grout having excellent seawater resistance and capable of exhibiting high strength.

Next, with the same composition as in Example 1, SiO₂
/ Na₂When using water glass with an O molar ratio of 3.7,
Investigation of gelation time and early uniaxial compressive strength of liquid grout
In the case of using the cement of Example 2, gelation time
Is 11 seconds, uniaxial compressive strength (1 hour) is 0.5 kgf / c
m², Uniaxial compressive strength (3 hours) is 2.8kgf / cm ²
In addition, when the cement of Example 8 is used,
13 seconds, uniaxial compression strength (1 hour) 0.4k
gf / cm², Uniaxial compressive strength (3 hours) is 3.2kgf
/ Cm²On the other hand, SiO₂/ Na₂O molar ratio
Of two-part grout with water glass of 3.0
When the cement of Example 2 was used, the gelling time was
The conversion time is 26 seconds and SiO₂/ Na₂O molar ratio is
When water glass of 3.3 to 4.0 is used, during gelation
It can be seen that the time is short and the early strength increases.

[0054]

[Effect] By using the two-component grout composition of the present invention, it is possible to obtain a backfilling material or an injecting material having excellent resistance to erosion of seawater. It can contribute greatly to the development of areas affected by seawater, including the use of water.

It should be noted that having excellent seawater resistance means having resistance to erosion of sulfate ions and chlorine ions, and the two-component grout composition of the present invention is used as a sulfate salt grout or chloride resistance grout. Can also be applied.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location // C04B 28/26 (C04B 28/26 18:14 14:10 Z 24:04 28:26 28 : 14) 103: 20 111: 70 C09K 103: 00 (72) Inventor Takasei Kamata 1-28-10 Hongo, Bunkyo-ku, Tokyo Chichibu Cement Co., Ltd. Related Products Division (72) Inventor Mitsuo Tanaka Saitama Prefecture 2-1-1 Tsukimi-cho, Kumagaya-shi Chichibu Cement Co., Ltd. Central Research Laboratory (72) Inventor Saburo Ishii 1-6-15 Hokima Hokima, Adachi-ku, Tokyo Within Tachibana Material Tokyo Branch Co., Ltd.

Claims (6)

[Claims] 1. A two-component grout composition comprising a mixture of a suspension containing cement and water glass, wherein 3CaO.SiO ₂ , 2CaO.Si is contained as a component of the cement.
_{O 2, 3CaO · Al 2 O} 3, 4CaO · Al 2 O 3 ·
A two-part grout composition containing Fe ₂ O ₃ and gypsum, and having a SiO ₂ / Al ₂ O ₃ (weight ratio) of 8 to 15 in this cement. 2. (Fe₂O₃) / (3CaO ・ SiO₂
+ 2CaO / SiO ₂+ 3CaO / Al₂O₃+ 4Ca
O ・ Al₂O₃・ Fe₂O₃2-4% by weight of gypsum)
The cement according to claim 1, wherein the cement is used.
Two-part grout composition. 3. (3CaO.SiO ₂ ) / (3CaO.)
_{SiO 2 + 2CaO · SiO 2 +} 3CaO · Al 2 O 3
+ 4CaO ・ Al ₂ O ₃・ Fe ₂ O ₃ + gypsum) is 20 ~
40% by weight, (2CaO · SiO ₂ ) / (3CaO · S
_{iO 2 + 2CaO · SiO 2 +} 3CaO · Al 2 O 3 +
4CaO ・ Al ₂ O ₃・ Fe ₂ O ₃ + gypsum) 40-6
The two-part grout composition according to claim 1 or 2, wherein 5% by weight of cement is used. 4. (Blast furnace slag) / (3CaO.SiO)₂
+ 2CaO / SiO ₂+ 3CaO / Al₂O₃+ 4Ca
O ・ Al₂O₃・ Fe₂O₃+ Gypsum + blast furnace slag) is 5
Cement added with blast furnace slag so as to be up to 50% by weight
Claim 1, characterized in that
The two-part grout composition of claim 2 or claim 3. 5. Gypsum is 0.5 in terms of SO _{3 in} cement.
The two-part grout composition according to claim 1, claim 2, claim 3 or claim 4, wherein the cement is used in an amount of ˜4.5% by weight. 6. The SiO ₂ / Na ₂ O (molar ratio) is 3.3.
2. The two-part grout composition according to claim 1, wherein water glass of 4.0 is used.