WO2007029399A1 - 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 cm2/g or larger and a calcium sulfoaluminate expanding material having a Blaine specific surface area exceeding 4,500 cm2/g.

Description

 Specification

 Cement composition for grout and grout material using the same

 The present invention relates to a cement composition for grout used in the civil engineering / architecture field and a grout material using the same, and more particularly to a cement composition for grout having a high fluidity and high strength and a grout material using the same. Background art

 Conventionally, as a dart material, a cement containing a water reducing agent is generally used. Further, a foaming agent such as calcium sulfoaluminate-based or lime-based expansion material, aluminum powder, etc. is added to make it shrinkless. Materials such as river sand and silica sand, etc., and pastes and mortars for civil engineering and construction work, in particular, fine voids in concrete structures, voids in the reverse casting method, repair and reinforcement of structures, machinery It is widely used for the filling method under the base plate and under the track deck.

 And the grout materials include PC grout, prepacked concrete grout, tunnel and shield backfill grout, precast grout, structural repair and reinforcement grout, rebar joint grout, bridge support grout, Mechanical Under-base grout, under-paving grout, under-track slab grout, and nuclear power plant containment grout.

 In recent years, the quality of concrete used in civil engineering and building structures has improved, and the performance required for grouting materials has increased.

The performance required for cement admixtures for grout is (1) no shrinkage, (2) good flowability and good retention, and (3) bleeding without material separation. However, in recent years, the strength of concrete has been increasing, so depending on the application, it is also necessary to increase the strength of the grout material, and high fluidity is required depending on the filling location (non-patent literature). 1). Non-Patent Document 1: “Experimental Study on Fillability of High-Strength Grout Materials”, Summary of Academic Lectures of the Architectural Institute of Japan, N0.1313, August 1995.

 In addition, if a large amount of water reducing agent is added to improve fluidity, bubbles are likely to be generated in the mortar, particularly at high temperatures.

 If a large amount of foam was generated, not only did it not adhere to the concrete, but there was a possibility of material separation, and it was thought that a gap might be formed between the concrete and there were problems in construction.

 On the other hand, it is also known that by using a cement-type grout composition combined with a specific water reducing agent, the temperature dependency is low, the fluidity / fillability retention effect is remarkably high, and the strength enhancement effect can be expected over a long period of time. (See Patent Document 1).

 Patent Document 1: Japanese Patent Laid-Open No. 2003-1 71 162

Patent Document 1 states that, in a composition composed of cement, fine aggregate, water reducing agent, expansion material, fine inorganic powder, and foaming material, the mixing amount of the water reducing agent is 0.05 to 4 parts by mass with respect to 100 parts by mass of cement. Yes, 10 to 30 parts by mass of melamine sulfonate-based water reducing agent in 100 parts by mass of the water-reducing agent, 55 to 85 parts by mass of naphthalene sulfonate-based water reducing agent, 5 to 20 lignin sulfonate-based water reducing agent The invention according to claim 1 is described, wherein the expansion material includes “awin-based expansion material, lime-based expansion material, free lime, As an expansion material containing free lime, dAF and anhydrous gypsum, it is described that the use of an expansion material containing calcium aluminolite and secoc (paragraph [0006]) is described. things down specific surface area of 4000cm ² / g ( Although drop [0028]) are shown, not shown to combine certain Rise stretched member. In addition, the expansion material is used for the purpose of obtaining sufficient dimensional stability (paragraph [0007]), and it is not suggested that the use of a specific expansion material prevents the generation of bubbles.

 Furthermore, by using a specific expansion material in combination, it is possible to obtain an excellent effect of imparting high strength and good adhesion properties to the cured body with a large expansion amount that is stable at the early age of the material in a normal pre-delay time. Known (see Patent Document 2).

 Patent Document 2: Japanese Patent Laid-Open No. 2003-128449

Patent Document 2, "CaO material, A1 ₂ Q ₃ raw material, a Fe ₂ 0 ₃ material and CAS0 ₄ material heat treatment A material obtained by heat-treating an expanded material containing free lime, calcium aluminoferrite and anhydrous gypsum, and a CaO raw material, Ak0 ₃ raw material and CaS0 ₄ raw material, A cement admixture consisting of a calcium sulfoaluminate and an expansion material containing non-aqueous gypsum. Although the invention of (claim 1) is described, “the particle size of the expansion material is not particularly limited, but usually a plain specific surface area of 1500 to 4500 cm ² / g is preferable. 1500 cm ² / If it is less than g, unreacted substances may remain for a long period of time, and durability may be reduced. If it exceeds 4500 cm ² / g, the hydration reaction may be fast and the prescribed expansion performance may not be obtained. ”(paragraph [ 0 0 1 3]) is not intended to use an expansion material (expansion material) having a specific surface area of Blaine exceeding 4500 cm ² / g, and prevents the generation of bubbles. For this purpose, no specific expansion material (expansion material) is used. Disclosure of the invention

 Problems to be solved by the invention

 The present invention is intended to solve the above-mentioned problems, and is excellent in fluidity, prevents generation of bubbles, maintains an appropriate length change rate and volume expansion rate, and has a high strength performance. It is an object to provide a cement composition for use and a grout material using the same. Means for solving the problem

 As a result of various studies to solve the above problems, the inventor of the present invention has used a specific expansion material, contains pozzolanic fine powder, and further uses a specific water reducing agent in combination with a cement composition for grouting. The present invention was completed by obtaining the knowledge that the above-mentioned problems can be solved by adopting.

The present invention includes a cement, an expanding material, a pozzolanic fine powder, a foaming agent, and a group consisting of a naphthalene sulfonic acid water reducing agent, a melamine sulfonic acid water reducing agent, a lignin sulfonic acid water reducing agent, and a polycarboxylic acid water reducing agent. Two or more selected water reducing agents (however, it consists of two kinds of naphthalene sulfonic acid type water reducing agent and polycarboxylic acid type water reducing agent) Excluding water reducing agents. ) In the cement composition for grout, the expanded material has a Blaine specific surface area value of 2,000 cm ² / g or more and a calcium aluminoferrite-based expanded material and the Blaine specific surface area value exceeds 4,500 cm ² / g. Calcium sulfoaluminate-based expansive material is contained, and the expansive material has a brane specific surface area value of 2,000 to 6,000 cm ² / g of calcium aluminoferrite based expansive material and a brane specific surface area value. A cement composition for grout comprising 5,000 to 9,000 cm ² / g of calcium sulfoaluminate-based expansive material, wherein the calcium aluminoferrite-based expansive material comprises cement, expansive material, and pozzolanic soot powder. The cement composition for grout, which is 1 to 4 parts in 100 parts of the binder (hereinafter referred to as binder), The grout cement yarn is composed of 0.5 to 2 parts in 100 parts of the binder, and the total amount of the calcium aluminoferate-based expansive material and the calcium sulfoaluminate-based expansive material Is a cement composition for grout that is 3 to 6 parts in 100 parts of the binder, and the pozzolana fine powder is 3 to 10 parts of the cement material for grout in 100 parts of the binder, Further, the cement is a grout cement composition which is an early-strength Portland cement, and a dart material using the cement composition for drout.

.The invention's effect

 By using the cement composition for grout of the present invention, it is possible to provide a grout mortar having high strength, which maintains good fluidity, does not generate bubbles. BEST MODE FOR CARRYING OUT THE INVENTION

 Hereinafter, the present invention will be described in detail.

 Unless otherwise specified, parts% used in the present invention are based on mass.

In the present invention, the grouting mortanol includes grouting paste. In the present invention, cement, an expansion material comprising a calcium aluminoferrite-based expansion material and a calcium sulfoaluminate-based expansion material, pozzolanic fine powder, foaming And two or more water reducing agents selected from the group consisting of a naphthalene sulfonic acid water reducing agent, a melamine sulfonic acid water reducing agent, a lignin sulfonic acid water reducing agent, and a polycarboxylic acid water reducing agent. A grout mortar is prepared by blending a cement composition for dart with fine aggregate as necessary and kneading with water. As the expansion material used in the present invention, mainly from the viewpoints of expandability, fluidity, and water retention, a calcium aluminoferrite-based expansion material, and mainly the effect of suppressing expansion and generation of bubbles. Calcium sulfoaluminate expansion material is used in combination. Expansion material, CaO raw material, AL0 ₃ raw material, Fe ₂ 〇 ₃ raw material, and blended CAS0 ₄ raw material to a predetermined ratio, by using an electric furnace or a rotary kiln, generally 1,100 ~ 1,600 ° C Manufactured by heat treatment. If the heat treatment temperature is less than 1,100 ° C, the resulting expansion material may not have sufficient expansion performance, and if it exceeds 1,600 ° C, anhydrous gypsum may decompose.

CaO material as limestone or slaked lime or the like is, A1 ₂ 0 ₃ as a raw material bauxite Ya § Rumi residual ash and the like is, Fe ₂ 0 ₃ iron oxide copper Karami or commercial as raw material, and, as the CAS0 ₄ feedstock Examples include dihydrate gypsum, hemihydrate gypsum, and anhydrous gypsum.

Calcium aluminoferrite-based expansion material (hereinafter referred to as tAF expansion material) is a substance obtained by heat treatment of CaO raw material, A1 ₂ 0 ₃ raw material, Fe ₂ 0 ₃ raw material, and CaS 0 ₄ raw material, and free lime It is a swelling material containing calcium aluminoflite and anhydrous gypsum, and the proportion thereof is not particularly limited. However, in 100 parts of the swelling material, 30-60 parts of free lime is preferable, 40- 50 parts is more preferred. The calcium aluminoferrite is preferably 10 to 40 parts, more preferably 15 to 35 parts. Further, the anhydrous gypsum is preferably 10 to 40 parts, more preferably 20 to 35 parts.

The calcium aluminosilicate. Fuweraito of the present invention, although _{CaO-Al 2 0 3 -Fe 2} 0 3 system is a compound in which called total not particularly limited, in general, the CaO and C, AI2O3 A, When Fe ₂ 0 ₃ is F, compounds such as GAF and C ₆ AF ₂ are well known. You can think of it as a CAF.

The fineness of the expandable 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 surface area of the brane (hereinafter referred to as “brane value”). Below 2,000 cm ² / g, the amount of expansion is large and easy to breathe, and above 6,000 cm ² / g, good flow is achieved. There is a tendency that the time for maintaining the mobility is shortened.

 The amount of GAF expansion material used is preferably 1 to 4 parts, more preferably 2 to 3 parts, per 100 parts of the binder. If it is less than 1 part, good expansibility and water retention may not be obtained, and if it exceeds 4 parts, good expansibility may not be obtained as well.

Calcium sulfoaluminate-based expansive material (hereinafter referred to as CSA expansive material) is a substance obtained by heat-treating CaO raw material, Ak0 ₃ raw material, and CaS0 ₄ raw material, free stone ash, calcium sulfoaluminate The ratio is not particularly limited, but the free stone ash is preferably 5 to 40 parts, more preferably 15 to 35 parts, in 100 parts of the expanding material. Further, the calcium sulfoaluminate is preferably 10 to 40 parts, more preferably 15 to 35 parts. Further, the anhydrous gypsum is preferably 30 to 60 parts, more preferably 40 to 50 parts.

The calcium sulfoaluminate of the present invention consists of CaO-CaS0 ₄ -Al ₂ 0 ₃ system, and is a general term for an expansion material mainly composed of free lime, arwin, and anhydrous gypsum, and is particularly limited. but not, generally, result and the C, AI2O3 a, CaS0 ₄ and the CaO S, a compound represented as CSA is well known.

Fineness of CSA expansion material, preferably in excess of 4,500cm ² / g in Blaine value, more preferably 5,000 ~ 9,000cm ² / g. At 4,500 cm ² / g or less, the effect of suppressing foam generation may be small, and the amount of expansion may be larger than necessary. Even if it exceeds 9,000 cm ² / g, improvement in the effect cannot be expected. It is uneconomical.

 The amount of CSA expansion material used is preferably 0.5 to 2.0 parts in 100 parts of the binder. If it is less than 0.5 part, the effect of suppressing foam generation may not be obtained, and if it exceeds 2.0 part, improvement in effect cannot be expected.

In the present invention, in combination with CSA expansion material at 2,000 cm ² / g or more C ₄ AF expansion material and Blaine exceeds 4,500cm ² / g as an expansion member in Blaine value. The total amount of both is preferably 3 to 6 parts in 100 parts of the binder. If it is less than 3 parts, proper expansion may not be exhibited, and if it exceeds 6 parts, good expansion may not be obtained.

The pozzolanic fine powder used in the present invention is not particularly limited, and examples thereof include blast furnace granulated slag, fly ash, and silica fume. Among them, silica fume is used, and granulated silica fume is used for breeding. Prevention, strong It is preferable from the viewpoint of obtaining good fluidity in accordance with the degree of expression.

The fineness of the pozzolanic powder is preferably 3,000 cm ² / g or more in terms of a brane value. If it is less than 3,000 cm ² / g, sufficient effects may not be obtained in terms of good flowability of grout mortar, prevention of bleeding and strength development.

 The amount of pozzolanic fine powder used is preferably 3 to 10 parts per 100 parts of the binder. If it is less than 3 parts, the effect of preventing bleeding is low, and if it exceeds 10 parts, further effects cannot be expected.

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

 The foaming agent is not particularly limited, and examples thereof include metal powder and peroxide. Of these, aluminum powder is preferable. However, since the surface of the aluminum powder is easily oxidized and the reactivity decreases when 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 used is preferably 0.0003 to 0.003 parts with respect to 100 parts of the binder. If the amount is less than 0.0003 parts, the amount of expansion may be extremely small. If the amount exceeds 0.003 parts, the amount of expansion may be large and the strength may be significantly reduced.

 As the cement used in the present invention, various portland cements such as normal, early strength, very early strength, low heat, and moderate heat, and various portland cements mixed with blast furnace slag, fly ash, silica, limestone fine powder, etc. Mixed cement, waste-use type cement, so-called eco-cement, and the like are mentioned. Of these, early-strength cement is preferable in terms of strength development.

The water reducing agent used in the present invention is a general term for those having a dispersing action and air entraining action on cement and improving fluidity and increasing strength. Specifically, naphthalene sulfonic acid water reducing agent, melamine sulfonic acid water reducing agent Agents, lignosulfonic acid water reducing agents, and polycarboxylic acid water reducing agents can be used. In the present invention, two or more of them are used. Among these, it is preferable to use two or more of naphthalene sulfonic acid-based water reducing agent, melamine sulfonic acid-based water reducing agent, and lignin sulfonic acid-based water reducing agent. Naphthalene sulfonic acid-based water reducing agent and melamine sulfonic acid More preferably, it is based on a water reducing agent. The amount of naphthalene sulfonic acid-based water reducing agent used in 100 parts of the binder is preferably 0.8 to 2.0 parts in powder form, and the amount of melamine sulfonic acid-based water reducing agent used is preferably 0.2 to 0.4 parts. If the naphthalene sulfonic acid-based water reducing agent is less than 0.8 part, high fluidity may not be obtained. If it exceeds 2.0 parts, material separation may occur. In addition, if the melamine sulfonic acid water reducing agent is outside this range, appropriate fluidity may not be obtained.

 Further, oxycarboxylic acid or a salt thereof, sugars such as dextrin and sucrose, and those having a retarding property such as inorganic salts can be used in combination.

 In addition, the water-reducing agent can be used in either liquid or powder form. However, when used as a premix product, powder is preferred, and the amount added is 1.0 per 100 parts of binder. ~ 2.5 parts is preferred. If it is less than 1.0 part, high fluidity may be difficult to obtain, and if it exceeds 2.5 parts, material separation may occur.

 As fine aggregates used in the present invention, commonly used river sand, sea sand, dredged sand, and silica sand can be used. When used as a premix product, those dry sands are preferred. From the viewpoint of fluidity, the maximum particle size is preferably 1.2 mm.

 The amount of fine aggregate used is preferably 70 to 150 parts per 100 parts of binder. If it is less than 70 parts, the amount of shrinkage may increase, and if it exceeds 150 parts, strength and fluidity may decrease.

 The amount of kneading water used in the present invention is not particularly limited, but is usually preferably 25 to 45%, more preferably 30 to 40% in terms of the water-Z binder ratio. Outside this range, fluidity may be greatly reduced, material separation may occur, and strength may be reduced.

 The present invention will be described more specifically with reference to the following examples. However, the present invention is not limited to these examples. Example 1

In 100 parts of binder, expansion material shown in Table 1, 6 parts of pozzolana fine powder, 0.0014 part of foaming agent, 1.3 part of naphthalene sulfonic acid-based water reducing agent and 0.2 part of melamine sulfonic acid-based water reducing agent, and Prepare a grout material by mixing 100 parts of fine aggregate, add water so that the water / binder ratio is 32%, and knead using a high-speed hand mixer to make a grout mortar. Was measured to evaluate the generation of bubbles.

 The grout mortar produced was placed in a mold in a constant temperature and humidity chamber of 20 ° C and 80% RH, and the curing after one day was 20 ° C underwater curing. The rate, and compressive strength were measured. The results are also shown in Table 1.

<Materials used>

Cement: Early strong Portland cement, commercial product

Expansion material A: C ₄ AF expansion material, Brain value 2,500cm ² / g, Commercially available product

Expandable material B: CSA expanded material, brain value 6,050cm ² / g

Pozzolanic fine powder: Silica fumed granulated product, commercial product

Foaming agent: Aluminum powder, commercial product

Water reducing agent a: Naphthalenesulfonic acid water reducing agent, commercial product

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

Fine aggregate: Lime sand aggregate, density 2.62g / cm ³ , 1.2mm vulgar

 <Measurement method>

Fluidity: Measured according to the People's Republic of China National Standard GB2419-81 “Mortar fluidity measurement method”. Changes in fluidity over time are measured by grinding grout mortar with a high-speed hand mixer for 10 seconds each time.

Generation of bubbles: visual feeling

Length change rate: Measured according to the Japanese Standards Association ^ A 6202 “Expansion test for concrete using expansion material mortar” in Annex 1 Measured value at ages 2-8 days Volume expansion coefficient: Directional expansion coefficient, in accordance with the National Standard GBJ119 “Guidelines for Application of Concrete External Force Mouth” in a constant temperature and humidity chamber at 20 ° C and 80% RH Measure the value of 1 day after installation

Compressive strength: Compressive strength, measured according to China's National Standard GB177 “Cement Mortar Strength Test” table 1

From Table 1, experiment No. using expansion material A (C ₄ AF expansion material) with a brain value of 2,000 cm ² / g or more and expansion material B (CSA expansion material) with a brain value exceeding 4,500 cm ² / g No The grout mortars of Examples 1-2 to 1-5 and Nos. 1-7 to 1-10 have excellent fluidity, no bubble formation, length change rate, and volume expansion rate. It can be seen that it is held moderately and has high compressive strength.

C ₄ AF expandable material has a remarkable effect from 1 part in 100 parts of binding material, and if it exceeds 4 parts, the fluidity increases. The compressive strength decreases and the length change rate becomes too large. ! ~ 4 parts are preferred.

 The effect of CSA expansion material becomes remarkable from 0.5 part in 100 parts of the binder, and if it exceeds 2 parts, the improvement in compressive strength will reach its peak, so 0.5 to 2 parts is preferable.

On the other hand, the grout mortar of the comparative example of Experiment No. 1-1, which uses only the expansion material B (CSA expansion material) and does not use the expansion material A (C ₄ AF expansion material), is fluid as time passes. Decreases, bubbles are generated, and the rate of change in length is small. In addition, the grout mortar of the comparative example of Experiment No.1-6, which does not use the expansion material B (CSA expansion material) only with the expansion material A (C ₄ AF expansion material), has high fluidity, but does not generate bubbles. Yes, the volume expansion coefficient is small. Therefore, C ₄ AF expansion material with a brain value of 2,000 cm ² / g or more and a plain value It is preferable to add a CSA expansion material exceeding 4,500 cm ² / g to the grout mortar. 'Example 2

 In 100 parts of binder, 2 parts of expansion material A, 2 parts of expansion material B, pozzolanic fine powder shown in Table 2, 0.0014 part of foaming agent, 1.3 part of water reducing agent and 0.2 part of water reducing agent, and 100 parts of fine aggregate The same procedure as in Example 1 was conducted except that the grout material was prepared by mixing. The results are also shown in Table 2. 'Table 2

From Table 2, the grout mortars of Examples No.2-2 to 2-4 and No.1-3 containing 3 to 10 parts of pozzolana fine powder in 100 parts of binder showed excellent flow. As a result, it is understood that there is no generation of bubbles, the length change rate and the volume expansion rate are appropriately maintained, and the compressive strength is high.

 On the other hand, the grout mortar of Comparative Example No. 2-1 which does not contain pozzolanic fine powder has low fluidity, large volume expansion coefficient, and low compressive strength.

 Therefore, it is preferable to add 3 to 10 parts of pozzolana fine powder in 100 parts of the binder to form dart mortar. Example 3

In 100 parts of binder, 2 parts of expanded material A, 2 parts of expanded material B, 6 parts of pozzolanic fine powder, foaming agent The same procedure as in Example 1 was conducted, except that 0.0014 parts, a water reducing agent shown in Table 3, and 100 parts of fine aggregate were mixed to prepare a dart material. The results are also shown in Table 3.

 <Used materials>

 Water-reducing agent c: lignosulfonic acid-based water reducing agent, commercial product

 Water reducing agent d: Polycarboxylic acid based water reducing agent, commercial product, Table 3

表 3より、 減水剤 a (ナフタレンスルホン酸系減水剤）、 減水剤 b (メラミン スルホン酸系減水剤）、 減水剤 c (リグニンスルホン酸系減水剤）、 減水剤 d (ポ リカルボン酸系減水剤） からなる群より選ばれた二種以上 （ナフタレンスルホン 酸系減水剤及びポリカルボン酸系減水剤の二種の組合せを除く） を組み合わせて 含有させた実験 No.3-1 〜 3-3、 No.1-3, No.3-8〜 3-13の実施例のグラゥトモルタ ルは、 優れた流動性が得られ、 泡の発生がなく、 長さ変化率、 体積膨張率が適度 に保持され、 圧縮強度が高いことが分かる。

From Table 3, water reducing agent a (naphthalene sulfonic acid water reducing agent), water reducing agent b (melamine sulfonic acid water reducing agent), water reducing agent c (lignin sulfonic acid water reducing agent), water reducing agent d (polycarboxylic acid water reducing agent) ) Experiment Nos. 3-1 to 3-3 in which two or more selected from the group consisting of (excluding two combinations of naphthalene sulfonic acid water reducing agent and polycarboxylic acid water reducing agent) were combined. The grout mortars of the examples of No.1-3 and No.3-8 to 3-13 have excellent fluidity, no generation of bubbles, and the length change rate and volume expansion rate are maintained moderately. It can be seen that the compressive strength is high.

 On the other hand, the grout mortar of Comparative Example No. 3-4, which contains the water reducing agent a (naphthalenesulfonic acid-based water reducing agent) but does not contain the water reducing agents b, c, d, has high fluidity. However, bubbles are generated and the volume expansion coefficient becomes negative.

Contains water reducing agent b (melamine sulfonic acid based water reducing agent), but water reducing agents a, c, d The grout mortar of the comparative example of Experiment No. 3-5, which does not contain, the fluidity greatly decreases with the passage of time, bubbles are generated, and the volume expansion coefficient becomes negative.

 The grout mortar of Comparative Example No. 3-6, which contains the water reducing agent c (lignin sulfonic acid water reducing agent) but does not contain the water reducing agent abd, has low fluidity, foam generation, and volume expansion. The rate becomes negative and the compressive strength is small.

 The grout mortanol of the comparative example of Experiment No.3-14, which contains the water reducing agent d (polycarboxylic acid-based water reducing agent) but does not contain the water reducing agent abc, can improve the flowability with a small amount of addition S, Bubbles are generated, the volume expansion coefficient becomes negative, and the compressive strength is small. Even when the two types are combined, Experiment No. 3-7 contains two types of water reducing agents, water reducing agent a (naphthalenesulfonic acid-based water reducing agent) and water reducing agent d (polycarboxylic acid-based water reducing agent). The grout mortar of the comparative example has no generation of bubbles, the length change rate and the volume expansion rate are appropriately maintained, and the compression strength is high, but the flow down is large and the fluidity is hindered. Therefore, the combination of naphthalenesulfonic acid-based water reducing agent and polycarboxylic acid-based water reducing agent is not preferable in terms of fluidity, and in order to improve this fluidity, experiments No.3-8 No.3-11, It is necessary to combine another type (water reducing agent bc) or more like No.3-13.

■ Example 4

 100 parts of binder, 50 parts of expansion material A and 50 parts of expansion material B, the expansion material shown in Table 4, 6 parts of pozzolanic fine powder, 0.0014 parts of foaming agent, 1.3 parts of water reducing agent and 0.2 part of water reducing agent b, and The same procedure as in Example 1 was conducted except that 100 parts of fine aggregate was mixed to prepare a grout material. The results are also shown in Table 4.

 Table 4

表 4より、 膨張材 Aと膨張材 Bを合計量で、 結合材 100部中、 3〜 6部含有さ せた実験 No.4-2 〜 4-4、 No.1-3の実施例のグラゥトモルタルは、 優れた流動性が 得られ、 泡の発生がなく、 長さ変化率、 体積膨張率が適度に保持され、 圧縮強度 が高いことが分かる。

From Table 4, the total amount of expansion material A and expansion material B in 3 to 6 parts of binder in 100 parts of the experiment Nos. 4-2 to 4-4 and Nos. 1-3 It can be seen that grout mortar has excellent fluidity, no generation of bubbles, length change rate and volume expansion rate are moderately maintained, and compressive strength is high.

 On the other hand, the grout mortar of the comparative example of Experiment No. 4-1, which does not contain an expandable material, has bubbles and has a small rate of change in length.

Accordingly, it is preferable to add 3 to 6 parts of C ₄ AF expansion material and CSA expansion material in a total amount of 100 parts of binder to form grout mortar. Example 5

 In 100 parts of binder, 2 parts of expansion material A, 2 parts of expansion material B, 6 parts of pozzolana fine powder, foaming agent shown in Table 5, 1.3 parts of water reducing agent and 0.2 part of water reducing agent b, and 100 parts of fine aggregate The same procedure as in Example 1 was conducted except that the grout material was prepared by mixing. The results are also shown in Table 5.

 Table 5

表 5より、発泡剤を、結合材 100部中、 0.0003 〜 0.003部含有させた実験 No.5-l、 No.5-2、 No.1-3 の実施例のグラウトモルタルは、 優れた流動性が得られ、 泡の発 生がなく、 長さ変化率、 体積膨張率が適度に保持され、 圧縮強度が高いことが分 かる。 実施例 6

From Table 5, the grout mortars of Examples No. 5-l, No. 5-2, and No. 1-3 in which 0.0003 to 0.003 parts of the foaming agent was contained in 100 parts of the binder had excellent flow. As a result, it is understood that there is no generation of bubbles, the length change rate and the volume expansion rate are appropriately maintained, and the compressive strength is high. Example 6

In 100 parts of binder, 2 parts of expansion material A and 2 parts of expansion material C, 2 parts of expansion material A and 2 parts of expansion material D Example 1 except that 6 parts of pozzolana fine powder, 0.0014 part of foaming agent, 1.3 part of water reducing agent, 0.2 part of water reducing agent b, and 100 parts of fine aggregate were mixed to prepare a grout material. went. The results are also shown in Table 6.

Expandable material C: CSA expanded material, plain value 4,580cm ² / g

Expandable material D: CSA expanded material, brain value 5,070cm ² / g

 Table 6

表 6より、 CSA膨張材のブレーン値が実施例の実験 No.1-3 よりも小さい場合 でも、 実験 No.6-1及び 6-2の実施例の 4,500cm²/gを超える CSA膨張材 （膨張材 C及び膨張材 D ) を使用したグラウトモルタルは、 優れた流動性が得られ、 泡の 発生がなく、 長さ変化率、 体積膨張率が適度に保持され、 圧縮強度が高いことが 分かる。

From Table 6, even if the Blaine value of CSA Expansive is smaller than the experimental No.1-3 embodiment, CSA Expansive exceeding 4,500cm ² / g of Example experiments No.6-1 and 6-2 Grout mortar using (Expanding Material C and Expanding Material D) has excellent fluidity, no bubbles are generated, length change rate and volume expansion rate are moderately maintained, and compressive strength is high. I understand.

• Comparative example

In 100 parts of binder, 2 parts of expansion material A, 2 parts of expansion material E, 6 parts of pozzolanic powder, 0.0014 part of foaming agent, 1.3 parts of water reducing agent and 0.2 part of water reducing agent, and 100 parts of fine aggregate are mixed. Then, the same procedure as in Example 1 was performed except that the dial material was prepared. The results are also shown in Table 7. Expandable material E: CSA expanded material, Blaine 4,380cm ² / g

 Table 7

表 7に示されるように、 実験 No.7-1 の比較例のブレーン値が 4，500cm²/g以下 の CSA膨張材 （膨張材 E ) を使用したグラウトモルタルには、 泡の発生が見ら れた。 産業上の利用可能性

As shown in Table 7, the grout mortar using CSA Expansive Blaine value of comparative example following 4,500cm ² / g Experimental Nanba7-1 (expansive E), seen bubble formation It was. Industrial applicability

 As described above, the grout mortar (grouting material) using the cement composition for grout of the present invention has excellent fluidity, no generation of bubbles, length change rate and volume expansion rate. Because it is moderately retained and has high compressive strength, civil engineering / construction work, especially fine voids in concrete structures, voids in the reverse driving method, repair and reinforcement of structures, under the base plate of machinery and under the track deck It can be used for the construction method that fills to etc. .

Claims

The scope of the claims 1. selected from the group consisting of cement, expansive material, pozzolanic fine powder, foaming agent, and naphthalene sulfonic acid water reducing agent, melamine sulfonic acid water reducing agent, lignin sulfonic acid water reducing agent, and polycarboxylic acid water reducing agent. In the cement composition for grout, comprising two or more water-reducing agents (excluding a water-reducing agent comprising two kinds of naphthalene sulfonic acid-based water reducing agents and poly-strong sulfonic acid-based water reducing agents). The material contains brae: / a calcium aluminate-based expansion material with a specific surface area value of 2,000 cm ² / g or more and a calcium sulfoaluminate-based expansion material with a specific surface area value of 4,500 cm ² / g. A cement composition for dartite. 2. The expansion material comprises a calcium aluminate-based expansion material having a brain surface area value of 2,000 to 6,000 cm ² / g and a calcium sulfoaluminate expansion material having a brain surface area value of 5,000 to 9,000 cm ² / g. 2. The cement composition for grout according to claim 1, which is contained.  3. The calcium aluminoferrite-based expansion material is 1 to 4 parts in 100 parts of a binder composed of cement, expansion material, and pozzolanic fine powder. The cement composition for dartite according to item.  4. The calcium sulfoaluminate-based expansion material is 0.5 to 2 parts in 100 parts of a binder composed of cement, expansion material, and pozzolanic fine powder. The cement composition for grout as described in any one of items 3. 5. The total amount of the calcium aluminoferrite-based expansive material and the calcium sulfonoreluminate-based expansive material is 3-6 parts in 100 parts of a binder composed of cement, expansive material, and pozzolanic fine powder. The cement composition for dartite according to any one of claims 1 to 4, wherein the cement composition is used for drout.  6. The pozzolan fine powder is 3 to 10 parts out of 100 parts of a binder made of cement, an expanding material, and pozzolanic fine powder, according to any one of claims 1 to 5. The cement composition for dalat according to one item. 7. The cement is an early-strength Portland cement, The cement composition for dartite according to any one of items 1 to 6 in the range.  8. A grout material obtained by using the cement composition for grout according to any one of claims 1 to 7.