KR20080038184A - Cement composition for grouting and grout material comprising the same - Google Patents

Abstract

A cement composition for grouting which has excellent flowability, is prevented from bubbling, retains an appropriate length change and volume expansion, and has high-strength performance; and a grout material comprising the cement composition. The cement composition for grouting comprises a cement, expanding materials, a fine pozzolan powder, a blowing agent, and two or more water-reducing agents selected from the group consisting of naphthalenesulfonic acid water-reducing agents, melaminesulfonic acid water-reducing agents, lignoesulfonic acid water-reducing agents, and polycarboxylic acid water-reducing agents (provided that a combination of a naphthalenesulfonic acid water-reducing agent and a polycarboxylic acid water-reducing agent is excluded), and is characterized in that the expanding materials comprise a calcium aluminoferrite expanding material having a Blaine specific surface area of 2,000 cm^2/g or larger and a calcium sulfoaluminate expanding material having a Blaine specific surface area exceeding 4,500 cm^2/g.

Description

Cement composition for grout and grout material using the same

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grout cement composition used in civil engineering and construction, and to a grout material using the same, in particular, a high flow, high strength grout cement composition, and a grout material using the same.

Conventionally, as a grout material, it is common to add a water reducing agent to cement, and also shrinkage-free by adding a foaming agent such as calcium sulfoaluminate or lime-based expanding material or aluminum powder. As a material, steel sand, silica sand, etc. are mixed, and paste or mortar is used for civil engineering and construction work, in particular, fine pores of concrete structures, voids in reversing method, repair and reinforcement of structures, BACKGROUND OF THE INVENTION It is widely used in the method of filling the lower part of the base plate of a mechanical device, the lower part of the track top plate, or the like.

In addition, the grout material includes PC grout, grout for pre-concrete concrete, backfill grout of tunnel or shield, precast grout, repair or reinforcement injection grout of structure, reinforcing bar grout, bridge bottom grout. , Mechanical pedestal lower grout, pavement lower grout, orbital lower slab grout, and nuclear power plant containment lower grout.

In recent years, the quality of concrete used for civil engineering and architectural structures has been improved, and the performance required for grout materials has been advanced.

As the performance required for the cement grout for grout, it is required to have no shrinkage, good fluidity, good retention, no bleeding or material separation. Since high strength has been advanced, high strength is required for the grout material depending on the use, and high fluidization is required depending on the filling position (see Non-Patent Document 1).

[Non-Patent Document 1] 「Experimental Study on the Fillability of High Strength Grout Materials」, Academic Lecture Collection of Japanese Architecture Society, NO.1313, August 1995

Moreover, in order to improve fluidity | liquidity, when a large amount of a water reducing agent is mix | blended, foaming will be easy to generate | occur | produce in mortar, and especially it may arise remarkably under high temperature.

When a large amount of foam is generated, not only the adhesion with concrete is not good, but also there is a possibility of material separation, and there is a gap between the concrete and it is thought that there is a problem in construction.

On the other hand, by using the cement type grout composition which combined the specific water reducing agent, it is also known that there is little temperature dependence, the fluidity and filling retention effect is remarkably high, and the strength improvement effect can be expected over a long term (refer patent document 1).

[Patent Document 1] Japanese Patent Publication No. 2003-171162

In Patent Literature 1, "A composition comprising cement, fine aggregate, water reducing agent, expanding material, inorganic fine powder, and foaming material, the compounding amount of the water reducing agent is 0.05 to 4 parts by mass relative to 100 parts by mass of cement, this water reducing agent 100 A cement-based grout composition comprising 10 to 30 parts by mass of a melamine sulfonate-based water reducing agent, 55 to 85 parts by mass of a naphthalene sulfonate-based water reducing agent, and 5 to 20 parts by mass of a lignin sulfonate-based water reducing agent. '' (Claim 1) [0006] As described above, as the expandable material, an "expanded material made of free lime, calcium aluminoferrite and gypsum, etc., in addition to a Auyne-based expander or a lime-based expander" (paragraph [0006]) is used. It is described, and as a swelling material containing glass lime, C ₄ AF and anhydrous (non-water) gypsum, the thing of the Blaine specific surface area 4000 cm 2 / g (paragraph) is shown, Combining the intumescent material is not shown. In addition, the use of an inflating material (short circuit) for the purpose of obtaining sufficient dimensional stability, it is not suggested to prevent the generation of bubbles by using a specific inflating material.

Moreover, by using a specific expandable material in combination, the outstanding effect of providing a high strength and good adhesion property to a hardened body with a large expansion amount stabilized at the early stage of the aging at a normal transit time. It is also known to obtain (refer patent document 2).

[Patent Document 2] Japanese Patent Publication No. 2003-128449

Patent Document 2 discloses, "A material obtained by heat-treating a CaO raw material, an Al ₂ O ₃ raw material, a Fe ₂ O ₃ raw material, and a CaSO ₄ raw material, which contains free lime, calcium aluminoferrite and anhydrous gypsum. A cement admixture composed of an expanded material, an expanded material containing CaO raw material, Al ₂ O ₃ raw material and CaSO ₄ raw material, comprising an expanded material containing free lime, calcium sulfoaluminate and anhydrous gypsum. ”(Claim 1) Although this is described, "The particle size of an expandable material is not specifically limited, Usually, 1500-4500 cm <2> / g is preferable with respect to a blain specific surface area. If it is less than 1500 cm 2 / g, the unreacted substance may remain for a long time, and the durability may be lowered. If it exceeds 4500 cm 2 / g, the hydration reaction may be rapid, and the predetermined expansion performance may not be obtained. It is not intended to use an expandable material (expandable material) having a blain specific surface area of more than 4500 cm 2 / g because it is described as paragraph [0013], and also for the purpose of preventing the generation of bubbles, (Expandable material) is not used.

[Initiation of invention]

[Problem to Solve Invention]

The present invention is to solve the above problems, to provide an excellent flowability, to prevent the generation of bubbles, to maintain a moderate length change rate, volume expansion rate, a cement composition for grout having a high strength performance and a grout material using the same It is a task to do it.

[Means for solving the problem]

MEANS TO SOLVE THE PROBLEM As a result of carrying out various examinations in order to solve the said subject, the said subject can be solved by employing the grout cement composition which used the specific expansion material together, contained the fine pozzolanic powder, and used together the specific water reducing agent. It has been pointed out that the present invention has been completed by finding out that the present invention has been completed.

The present invention provides a cement, an expander, a fine pozzolanic powder, a blowing agent, and at least two water reducing agents selected from the group consisting of naphthalene sulfonic acid water reducing agents, melamine sulfonic acid water reducing agents, lignin sulfonic acid water reducing agents, and polycarboxylic acid water reducing agents. In the cement composition for grout comprising a naphthalene sulfonic acid sensitizer and a polycarboxylic acid sensitizer), the expanded material is calcium aluminoferrite having a specific surface area of at least 2,000 cm 2 / g. And a calcium sulfoaluminate-inflating material having a particle specific surface area value of more than 4,500 cm 2 / g, and the inflating material is a calcium aluminoferritic-inflating material and a grain having a specific surface area of 2,000 to 6,000 cm 2 / g. Contains calcium sulfoaluminate-based expander with a specific surface area of 5,000 to 9,000 cm2 / g This is a grout cement composition, wherein said calcium alumino ferrite expander is a cement composition for grout having 1 to 4 parts of 100 parts of a binder (hereinafter referred to as a binder) composed of cement, an expander, and a fine pozzolan powder, The calcium sulfoaluminate-based expander is a cement composition for grout having 0.5 to 2 parts of 100 parts of the binder, and the total amount of the calcium alumino ferrite-based expander and the calcium sulfoaluminate-based expander is 3 parts in 100 parts of the binder. It is the cement composition for grout which is -6 parts, The said pozzolan fine powder is the cement composition for grout which is 3-10 parts in 100 parts of binders, The cement composition for this grout whose said cement is a crude steel portland cement It is a grout material formed using this cement composition for grout.

[Effects of the Invention]

By using the cement composition for grout of the present invention, it is possible to provide grout mortar having good fluidity, no foaming, and high strength.

Best Mode for Carrying Out the Invention

Hereinafter, the present invention will be described in detail.

Part and% used by this invention are a mass reference | standard unless there is particular notice.

In addition, in this invention, grout mortar also includes grout paste.

In the present invention, an expanded material comprising cement, a calcium alumino ferrite-based expander and a calcium sulfoaluminate-based expander, a fine pozzolanic powder, a blowing agent, and a naphthalene sulfonic acid-based water reducing agent, a melamine sulfonic acid-based water reducing agent, a lignin sulfonic acid-type water reducing agent, and a poly A grout cement composition comprising two or more kinds of sensitizers selected from the group consisting of carboxylic acid-based sensitizers, and fine aggregates, if necessary, are kneaded and kneaded with water to grout mortar. It is to prepare.

As the expandable material used in the present invention, the calcium sulfoalumina is mainly used in view of the expansion properties, fluidity, and water retention, and the calcium aluminoferritic expandable material, and mainly in view of the effect of suppressing the expansion and foaming. Nate type expansion material is used together.

The expansion material is blended with CaO raw material, Al ₂ O ₃ raw material, Fe ₂ O ₃ raw material, and CaSO ₄ raw material in a predetermined ratio, and generally 1,100 to 1,600 using an electric furnace or a rotary kiln. It is prepared by heat treatment at ℃. If the heat treatment temperature is less than 1,100 ° C, the expansion performance of the obtained expanded material may not be sufficient, and if it exceeds 1,600 ° C, anhydrous gypsum may be decomposed.

Limestone or slaked lime as CaO raw materials, bauxite or aluminum residue as Al ₂ O ₃ raw materials, copper slag or commercially available iron oxides as Fe ₂ O ₃ raw materials, and CaSO ₄ Examples of the raw material include dihydrate gypsum, hemihydrate gypsum, and anhydrous gypsum.

Calcium alumino ferrite expander (hereinafter referred to as C ₄ AF expander) is a material obtained by heat-treating a CaO raw material, an Al ₂ O ₃ raw material, a Fe ₂ O ₃ raw material, and a CaSO ₄ raw material. It is an expanded substance containing lime, calcium aluminoferrite and anhydrous gypsum, and the ratio is not particularly limited. Among 100 parts of the expanded substance, free lime is preferably 30 to 60 parts, more preferably 40 to 50 parts. desirable. Moreover, 10-40 parts are preferable and, as for calcium alumino ferrite, 15-35 parts are more preferable. Moreover, 10-40 parts are preferable and, as for anhydrous gypsum, 20-35 parts are more preferable.

The calcium aluminoferrite of the present invention refers to a CaO-Al ₂ O ₃ -Fe ₂ O ₃ -based compound and is not particularly limited, but generally, CaO is C, Al ₂ O ₃ is A, Fe ₂ Assuming that the O ₃ F, is the compound represented by such as C ₄ AF or C ₆ AF ₂ is well known. Normally, it may be assumed that it exists as C ₄ AF.

The powder degree of the C ₄ AF expanding material is preferably 2,000 cm 2 / g or more, more preferably 2,000 to 6,000 cm 2 / g, in terms of the specific specific surface area value (hereinafter, referred to as the blain value). If it is less than 2,000 cm <2> / g, the expansion amount is large, and bleeding is easy to come out, and when it exceeds 6,000 cm <2> / g, the time which maintains favorable fluidity tends to become short.

The amount of C ₄ AF expandable material is, preferably 1 to 4 additional 100 parts of binder, and more preferably 2 to 3 additional. If it is less than 1 part, good expandability and water retention property may not be obtained, and if it exceeds 4 parts, similarly good expandability may not be obtained.

Calcium sulfoaluminate-based expander (hereinafter referred to as CSA expander) is a material obtained by heat-treating a CaO raw material, an Al ₂ O ₃ raw material, and a CaSO ₄ raw material, and includes free lime, calcium sulfoaluminate, and anhydrous. Although it is an expanded substance containing gypsum and it does not specifically limit about the ratio, Among 100 parts of expanded substances, 5-40 parts of glass lime are preferable and 15-35 parts are more preferable. Moreover, 10-40 parts are preferable and, as for calcium sulfoaluminate, 15-35 parts are more preferable. Moreover, 30-60 parts are preferable and, as for anhydrous gypsum, 40-50 parts are more preferable.

Calcium sulfoaluminate of the present invention is composed of CaO-CaSO ₄ -Al ₂ O ₃ system, and refers to the expansion material mainly composed of glass lime, Auyne, and anhydrous gypsum, but is not particularly limited. In general, when CaO is C, Al ₂ O ₃ is A, and CaSO ₄ is S, compounds represented by CSA are well known.

It is preferable that the powder degree of a CSA expanded material exceeds 4,500 cm <2> / g by a blain value, and 5,000-9,000 cm <2> / g is more preferable. If it is 4,500 cm <2> / g or less, the foaming inhibitory effect may be small, and the amount of expansion may become larger than necessary, and even if it exceeds 9,000 cm <2> / g, the improvement of the effect cannot be expected and it is uneconomical.

As for the usage-amount of a CSA expanding material, 0.5-2.0 parts are preferable in 100 parts of binders. If it is less than 0.5 part, the suppression effect of foaming may not be obtained, and even if it exceeds 2.0 parts, the improvement of an effect cannot be expected.

In the present invention, a C ₄ AF expanding material having a plain value of 2,000 cm 2 / g or more and a CSA expanding material having more than 4,500 cm 2 / g having a blain value are used as the expanding material. As for the total amount of both, 3-6 parts are preferable in 100 parts of binders. If it is less than 3 parts, an appropriate expansion may not be shown, and when it exceeds 6 parts, favorable expandability may not be obtained.

The pozzolane fine powder to be used in the present invention is not particularly limited, but may include blast furnace hydrous slag, fly ash, silica fume, and the like. Among them, silica fume is also a particle forming agent. One silica fume is preferable in terms of preventing bleeding and developing strength and obtaining good fluidity.

As for the powder degree of pozzolan fine powder, 3,000 cm <2> / g or more is preferable at a blain value. If it is less than 3,000 cm <2> / g, sufficient effect may not be acquired in terms of the favorable fluidity | liquidity of grout mortar, prevention of bleeding, and strength development.

The amount of pozzolan fine powder used is preferably 3 to 10 parts in 100 parts of the binder. If it is less than 3 parts, the bleeding prevention effect is low, and even if it exceeds 10 parts, the improvement effect cannot be expected.

In the present invention, in order to obtain initial expansion of the grout mortar after kneading, a blowing agent that generates gas when kneaded with water is used in combination.

It does not specifically limit as a blowing agent, For example, metal powder, a peroxide, etc. are mentioned. Among them, aluminum powder is preferable, but since the surface of the aluminum powder is easily oxidized and the reactivity decreases when it is covered with an oxide film, aluminum powder surface-treated with vegetable oil, mineral oil, stearic acid, or the like is preferable.

The amount of the blowing agent is preferably 0.0003 to 0.003 parts based on 100 parts of the binder. If it is less than 0.0003 parts, the amount of expansion may be extremely small, and if it exceeds 0.003 parts, the amount of expansion may be large and the strength decrease may be remarkable.

As the cement used in the present invention, various portland cements such as crude steel, ultra crude steel, low heat, and medium heat, such as blast furnace slag, fly ash, silica, Or various mixed cement which mixed limestone fine powder etc., waste utilization type | mold, what is called an eco cement, etc. are mentioned, Among them, a crude steel cement is preferable at the point of strength expression.

The water reducing agent used in the present invention is a generic term for improving the fluidity and enhancing the strength by dispersing or entraining the cement, and specifically, naphthalene sulfonic acid water reducing agents, melamine sulfonic acid water reducing agents, and lignin sulfonic acid systems. A water reducing agent and a polycarboxylic acid type water reducing agent can be used, and in this invention, 2 or more types of them are used. Among these, it is preferable to use 2 or more types of a naphthalene sulfonic acid type | system | group sensitizer, a melamine sulfonic acid type | system | group sensitizer, and a lignin sulfonic acid type | system | group sensitizer, and it is more preferable to base on a naphthalene sulfonic acid type | system | group sensitizer and a melamine sulfonic acid type | system | group sensitizer.

As for the usage-amount of a naphthalene sulfonic-acid reducing agent with respect to 100 parts of binders, 0.8-2.0 parts are preferable in powder, and the usage-amount of a melamine sulfonic-acid reducer is 0.2-0.4 part. If the naphthalene sulfonic acid-based water reducing agent is less than 0.8 part, high fluidity may not be obtained. If it is more than 2.0 part, material separation may occur. In addition, a melamine sulfonic acid type reducing agent may not obtain appropriate fluidity outside this range.

Furthermore, it is possible to use together oxycarboxylic acid or its salt, sugars, such as dextrin and sucrose, and things which have retardation, such as an inorganic salt.

In addition, although the liquid and powder can be used as a mode of using a water reducing agent, when using as a premix product, powder is preferable and the addition amount is 1.0-2.5 parts with respect to 100 parts of binders. If it is less than 1.0 part, it may be difficult to obtain high fluidity, and if it exceeds 2.5 parts, material separation may occur.

As the fine aggregate used in the present invention, commonly used steel sand, sea sand, crushed sand, silica sand, and the like can be used, and when used as a premixed product, these dry sands are preferable, and their grain size is preferred. In terms of fluidity, the maximum particle size is preferably 1.2 mm.

The use amount of fine aggregate is preferably 70 to 150 parts with respect to 100 parts of the binder. When it is less than 70 parts, shrinkage may increase, and when it exceeds 150 parts, strength and fluidity may fall.

Although the quantity of kneaded water used by this invention is not specifically limited, Usually, 25 to 45% is preferable and 30 to 40% is more preferable at a water / binder ratio. Outside this range, fluidity may greatly decrease, material separation may occur, and strength may decrease.

Although an Example is given to the following and this invention is demonstrated to it further more concretely, this invention is not limited to these Examples.

Example 1

In 100 parts of binder, the expanded material shown in Table 1, 6 parts of fine pozzolanic powder, 0.0014 parts of foaming agents, 1.3 parts of naphthalene sulfonic acid water reducing agents, 0.2 parts of melamine sulfonic acid water reducing agents, and 100 parts of fine aggregates were mixed to prepare a grout material, and the water / binder ratio was Water was added to 32%, kneaded using a high speed hand mixer to prepare a grout mortar, the fluidity thereof was measured, and foaming conditions were evaluated.

In addition, the produced grout mortar is poured into a mold in a constant temperature and humidity chamber at 20 ° C. and 80% RH, and curing after 1 day is made in 20 ° C. in water curing, and the rate of change of length and volume expansion rate , And compressive strength were measured. The results are written together in Table 1.

<Used materials>

Cement: crude steel Portland cement, commercial item

Inflator A: C ₄ AF inflator, Blaine value 2,500 cm 2 / g, Commercial item

Inflator B: CSA Inflator, Blaine 6,050㎠ / g

Pozzolanic fine powder: Silica fume particle forming product, commercially available product

Foaming agent: aluminum powder, commercially available

Water reducing agent a: Naphthalene sulfonic acid water reducing agent, a commercial item

Water reducing agent b: Melamine sulfonic acid water reducing agent, commercial item

Fine aggregate: lime aggregate, density 2.62g / cm3, lower grade 1.2mm

<Measurement method>

Liquidity: Measured in accordance with National Standard GB2419-81 "Method of Measuring Mortar Flow" of the People's Republic of China, and the change of liquidity over time is measured by re-opening grout mortar for 10 seconds with a high speed hand mixer each time.

Occurrence of bubbles: Observed visually

Length change rate: Measured according to the Japanese Standards Association JIS A 6202 Annex 1 "Expansion Test Method for Mortar of Expandable Material". Measures of 28-day old age

Volume expansion rate: Vertical expansion rate, measured in 1 day after pouring in a constant temperature and humidity chamber at 80 ° C and 80% RH, in accordance with the National Standard GBJ119 "Technical Standards for Application of Concrete External Additives"

Compressive strength: Measured according to the tensile strength and the national standard GB177 Cement Mortar Strength Test of the People's Republic of China

From Table 1, used in combination with a Blaine value 2,000㎠ / g or more expandable material A (C ₄ AF expandable material), and the expandable material B (CSA expandable material) over the 4,500㎠ / g in Blaine value experiment No.1-2~1-5, It is understood that the grout mortar of the examples of Nos. 1-7 to 1-10 has excellent fluidity, no bubbles, no change in length and volume expansion ratio, and high compressive strength.

The effect of C ₄ AF expanding material becomes remarkable from one part among 100 parts of the binder, and if it exceeds 4 parts, the fluidity increases, but the compressive strength is lowered and the rate of change of length is too large, so 1 to 4 parts are preferred.

Since the effect becomes remarkable from 0.5 part among 100 parts of binders, and the improvement of compressive strength will become a limit when it exceeds 2 parts, 0.5-2 parts are preferable.

In contrast, the grout mortar of Comparative Example No. 1-1, which does not use only the inflator B (CSA inflator) and does not use the inflator A (C ₄ AF inflator), has a low fluidity, and bubbles are generated over time. It has a small length change rate. In addition, the grout mortar of Comparative Example No. 1-6, which uses only the expansion material A (C ₄ AF expansion material) and does not use the expansion material B (CSA expansion material), has high fluidity but generates bubbles and has a low volume expansion ratio.

Therefore, it is preferable to combine C ₄ AF inflator having a plain value of 2,000 cm 2 / g or more and CSA inflator having more than 4,500 cm 2 / g having a blain value and to include it in the grout mortar.

Example 2

Except that the grout material was prepared by mixing 2 parts of expander A, 2 parts of expander B, 0.0014 parts of foaming agent, 1.3 parts of reducing agent a, 0.2 parts of reducing agent b, and 100 parts of fine aggregate in 100 parts of a binder. It carried out similarly to 1. The results are written together in Table 2.

From Table 2, grout mortar of the examples of Experiment Nos. 2-2 to 2-4 and No. 1-3 containing fine pozzolane powder containing 3 to 10 parts of 100 parts of binder was obtained, and excellent fluidity was obtained. It can be seen that there is no occurrence, the length change rate and the volume expansion rate are maintained to an appropriate level, and the compressive strength is high.

In contrast, the grout mortar of Comparative Example No. 2-1 containing no pozzolan fine powder has low fluidity, high volume expansion coefficient, and low compressive strength.

Therefore, it is preferable to contain 3-10 parts of fine powder of pozzolane in 100 parts of binders, and to set it as grout mortar.

Example 3

It carried out similarly to Example 1 except having prepared the grout material by mixing 2 parts of expander A, 2 parts of expander B, 6 parts of fine powders of pozzolane, 0.0014 parts of foaming agents, the water reducing agent shown in Table 3, and 100 parts of fine aggregates. The results are written together in Table 3.

<Used materials>

Water reducing agent c: lignin sulfonic acid water reducing agent, commercial item

Water reducing agent d: polycarboxylic acid type water reducing agent, commercial item

From Table 3, 2 types selected from the group which consists of a water reducing agent a (naphthalene sulfonic acid water reducing agent), a water reducing agent b (melamine sulfonic acid water reducing agent), a water reducing agent c (lignin sulfonic acid water reducing agent), and a water reducing agent d (polycarboxylic acid water reducing agent) Experiment Nos. 3-1 to 3-3, No. 1-3, No. 3-8 to 3 containing the above-mentioned (except the combination of 2 types of a naphthalene sulfonic-acid reducer and a polycarboxylic acid-type reducer) The grout mortar of the Example -13 shows that excellent fluidity is obtained, there is no foaming, the rate of change of length and the rate of volume expansion are maintained to an appropriate level, and the compressive strength is high.

On the other hand, the grout mortar of the comparative example of Experiment No. 3-4 which contains the water reducing agent a (naphthalene sulfonic acid type water reducing agent) but does not contain the water reducing agents b, c, and d has a large fluidity, but there is foaming and volume The expansion rate becomes negative.

The grout mortar of the comparative example of Experiment No. 3-5, which contains a water reducing agent b (melamine sulfonic acid water reducing agent) but does not contain water reducing agents a, c, and d, has a large decrease in fluidity over time and generation of bubbles. The volume expansion ratio is negative.

The grout mortar of the comparative example of Experiment No. 3-6, which contains a water reducing agent c (lignin sulfonic acid water reducing agent) but does not contain water reducing agents a, b, and d, has low fluidity, bubbles, and a negative rate of volume expansion. And the compressive strength is small.

Although the grout mortar of the comparative example of Experiment No. 3-14 which contains a water reducing agent d (polycarboxylic acid-type water reducing agent) but does not contain water reducing agents a, b, and c, fluidity is improved by the addition of a small amount, there is foaming. The volume expansion ratio is negative and the compressive strength is small.

However, even when the two types are combined, the grout mortar of the comparative example of Experiment No. 3-7 containing the water reducing agent which consists of two types of a water reducing agent a (naphthalene sulfonic acid water reducing agent) and a water reducing agent d (polycarboxylic acid water reducing agent), No bubbles are generated, the rate of change of length and the rate of volume expansion are maintained to an appropriate level, and the compressive strength is high, but the flow is so large that fluidity is impaired. Therefore, the combination of a naphthalene sulfonic acid type reducing agent and a polycarboxylic acid type reducing agent only is not preferable from the viewpoint of fluidity, and in order to improve this fluidity, experiment No. 3-8, No. 3-11, No. 3-13. It is necessary to combine another 1 type (reducing agent b, c) more like this.

Example 4

In 100 parts of the binder, the expanded material shown in Table 4 consisting of 50 parts of expanded material A and 50 parts of expanded material B, 6 parts of fine pozzolan powder, 0.0014 parts of blowing agent, 1.3 parts of water reducing agent a, 0.2 parts of water reducing agent b, and 100 parts of fine aggregate were prepared to prepare a grout material. It carried out similarly to Example 1 except the thing. The results are written together in Table 4.

From Table 4, the grout mortar of the examples of Experiment Nos. 4-2 to 4-4 and No. 1-3, which contained 3 to 6 parts of the binder in 100 parts of the total amount of the expander A and the expander B in total amount, has excellent fluidity. It can be seen that there is no foaming, the rate of change of length and the rate of volume expansion are maintained to an appropriate level, and the compressive strength is high.

On the other hand, grout mortar of the comparative example of Experiment No. 4-1 which does not contain an expansion material has foaming, and its length change rate is small.

Therefore, the total content of C ₄ AF and CSA expandable material expandable material, 100 parts of the binding agent, 3 to 6 parts by containing it is preferable that the grout mortar.

Example 5

Except that the grout material was prepared by mixing 2 parts of expander A, 2 parts of expander B, 6 parts of pozzolane powder, 6 parts of foaming agent shown in Table 5, 1.3 parts of water reducing agent and 0.2 parts of water reducing agent b, and 100 parts of fine aggregate. It carried out similarly to 1. The results are written together in Table 5.

From Table 5, the grout mortar of Examples No. 5-1, No. 5-2, and No. 1-3 containing the foaming agent in an amount of 0.0003 to 0.003 parts in 100 parts of the binder was obtained with excellent fluidity. It can be seen that there is no occurrence, the length change rate and the volume expansion rate are maintained to an appropriate level, and the compressive strength is high.

Example 6

In 100 parts of binder, 2 parts of expander A and 2 parts of expander C, 2 parts of expander A and 2 parts of expander D, 6 parts of fine pozzolanic powder, 0.0014 parts of foaming agent, 1.3 parts of reducing agent a and 0.2 parts of reducing agent b, and fine aggregate 100 It carried out similarly to Example 1 except having mixed the parts and preparing the grout material. The results are written together in Table 6.

Expanding material C: CSA expanding material, blain value 4,580 cm 2 / g

Inflator D: CSA inflator, blain value 5,070 cm2 / g

From Table 6, CSA expanders (expandables C and expanders D) exceeding 4,500 cm 2 / g of the examples of Experiments Nos. 6-1 and 6-2, even if the BSA value of the CSA expanders was smaller than Experiment No. 1-3 of the Examples. It is understood that grout mortar using) has excellent fluidity, no foam, no change in length and volume expansion ratio, and high compressive strength.

[Comparative Example]

Example 1 except that 100 parts of the binder was prepared by mixing 2 parts of expander A, 2 parts of expander E, 6 parts of fine pozzolan powder, 0.0014 parts of foaming agent, 1.3 parts of water reducing agent a, 0.2 parts of water reducing agent b, and 100 parts of fine aggregate. The same was done. The results are written together in Table 7.

Expanding material E: CSA expanding material, brain 4,380 cm 2 / g

As shown in Table 7, the generation | occurrence | production of the bubble was seen in the grout mortar using the CSA expanded material (expandable material E) whose blain value of the comparative example of Experiment No.7-1 is 4,500 cm <2> / g or less.

As described above, the grout mortar (grout material) formed by using the cement composition for grout of the present invention has excellent fluidity, no foaming, length change rate and volume expansion ratio are maintained to an appropriate level, and the compressive strength It is so high that it is filled in civil engineering and construction works, especially fine pores of concrete structures, voids in reversed punching method, repair and reinforcement of structures, lower part of base plate of machinery and lower part of track top plate. It can be used for construction methods and the like.

Claims (8)

Cement, expander, pozzolane fine powder, foaming agent, and at least two water reducing agents selected from the group consisting of naphthalene sulfonic acid water sensitizers, melamine sulfonic acid water sensitizers, lignin sulfonic acid water sensitizers, and polycarboxylic acid water sensitizers, provided that naphthalene sulfonic acid type In the cement composition for grout containing the water reducing agent and the water reducing agent which consists of two types of a water reducing agent and a polycarboxylic acid type reducing agent), The expansion material is a cement composition for grout comprising a calcium aluminoferritic expansion material having a specific surface area value of 2,000 cm2 / g or more and a calcium sulfoaluminate-based expansion material exceeding 4,500 cm2 / g in a surface specific surface area value. . The method according to claim 1, A grout comprising the expandable material comprising calcium aluminoferritic expandable material having a specific surface area of 2,000 to 6,000 cm 2 / g and calcium sulfoaluminate expanded material having a specific surface area of 5,000 to 9,000 cm 2 / g. Cement composition. The method according to claim 1 or 2, The calcium alumino ferrite expansion material is a grout cement composition, characterized in that 1 to 4 parts out of 100 parts of the binder composed of cement, expanded material, and pozzolane fine powder. The method according to any one of claims 1 to 3, The calcium sulfoaluminate-based expansion material is 0.5 to 2 parts in 100 parts of a binder composed of cement, an expansion material, and a fine pozzolan powder. The method according to any one of claims 1 to 4, The total amount of the calcium alumino ferrite expander and the calcium sulfoaluminate expander is 3 to 6 parts in 100 parts of a binder composed of cement, an expander, and a fine pozzolan powder. The method according to any one of claims 1 to 5, The said pozzolan fine powder is 3-10 parts out of 100 parts of binders which consist of cement, an expanded material, and a pozzolan fine powder, The cement composition for grout characterized by the above-mentioned. The method according to any one of claims 1 to 6, The cement composition for grout, wherein the cement is a crude steel portland cement. The grout material which uses the cement composition for grout of any one of Claims 1-7.