JPWO2007029399A1 - Cement composition for grout and grout material using the same - Google Patents

Abstract

To provide a cement composition for grout having excellent fluidity, preventing generation of bubbles, maintaining an appropriate length change rate and volume expansion rate, and having high strength performance, and a grout material using the same. Is an issue. Two 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 a cement composition for grout containing at least one water reducing agent (excluding a water reducing agent consisting of two kinds of naphthalenesulfonic acid water reducing agent and polycarboxylic acid water reducing agent) and a grout material using the same The expansion material contains a calcium aluminoferrite-based expansion material having a Blaine specific surface area value of 2,000 cm2 / g or more and a calcium sulfoaluminate expansion material having a Blaine specific surface area value of more than 4,500 cm2 / g. It is characterized by that.

Description

  The present invention relates to a cement composition for grout used in the field of civil engineering and construction and a grout material using the same, and more particularly to a cement composition for grout with high flow and high strength and a grout material using the same.

Conventionally, grout materials are generally cement-added water-reducing agents. In addition, calcium sulfoaluminate-based or lime-based expansion materials, and foaming agents such as aluminum powder, are used as non-shrinkable materials. These are mixed with river sand, quartz sand, etc., and used as paste or mortar for civil engineering / construction work, especially fine voids in concrete structures, voids in the backlash method, repair and reinforcement of structures, under the base plate of machinery It is widely used in the construction method for filling under the track floor slab.
The grout materials include PC grout, prepacked concrete grout, tunnel and shield backfill grout, precast grout, structural repair and reinforcement infusion grout, rebar joint grout, bridge support grout, under machine pedestal There are grouts, pavement grouting, under-track slab grouting, and nuclear power plant containment grouting.
In recent years, the quality of concrete used for civil engineering and building structures has become higher, and the performance required for grout materials has become higher.
The performance required for cement admixtures for grout includes (1) no shrinkage, (2) good fluidity and good retention, and (3) no bleeding or material separation. However, in recent years, since the strength of concrete has been increased, it is necessary to increase the strength of the grout material depending on the use, and a high fluidity is required depending on the filling location (see Non-Patent Document 1). ).
"Experimental research on filling properties of high-strength grout materials", Summary of Academic Lectures of Architectural Institute of Japan, NO. 1313, August 1995

In addition, if a large amount of water reducing agent is blended in order to improve fluidity, bubbles are likely to be generated in the mortar, and may be remarkably generated particularly at high temperatures.
When a large amount of foam is generated, not only adhesion to the concrete can be removed, but there is a possibility that material separation has occurred, and it is considered that a gap is formed between the concrete and a construction problem.
On the other hand, it is also known that by using a cement-type grout composition in combination with a specific water reducing agent, temperature dependency is low, fluidity / fillability retention effect is remarkably high, and strength enhancement effect can be expected over a long period of time. (See Patent Document 1).
Japanese Patent Laid-Open No. 2003-171162

In Patent Document 1, “in a composition comprising cement, fine aggregate, water reducing agent, expansion material, fine inorganic powder and foamed material, the amount of water reducing agent is 0.05 to 4 parts by mass with respect to 100 parts by mass of cement. 10 to 30 parts by mass of the melamine sulfonate-based water reducing agent, 55 to 85 parts by mass of the naphthalene sulfonate-based water reducing agent, and 5 to 20 lignin sulfonate-based water reducing agent in 100 parts by mass of the water reducing agent. The invention according to claim 1 is described, wherein the expansion material includes “free lime, calcium in addition to the Auin expansion material and the lime expansion material”. describes the use of alumino ferrite and gypsum expansion material such as comprising a "(paragraph [0006]), as an expansion material free lime, it contains a C 4 _AF, and anhydrous gypsum, Blaine specific Those area 4000 cm ² / g (Paragraph [0028]) are shown, not shown to combine specific expandable material. In addition, an expansion material is used for the purpose of obtaining sufficient dimensional stability (paragraph [0007]), and it is not suggested to use a specific expansion material to prevent generation of bubbles.
Furthermore, it is also known that by using a specific expansion material in combination, it is possible to obtain an excellent effect of imparting high strength and good adhesive properties to the cured body with a large expansion amount that is stable at an early stage of the material age in a normal pre-set time. (See Patent Document 2).
JP 2003-128449 A

Patent Document 2 states that “a material obtained by heat-treating a CaO raw material, an Al ₂ O ₃ raw material, an Fe ₂ O ₃ raw material, and a CaSO ₄ raw material, which contains free lime, calcium aluminoferrite, and anhydrous gypsum. And a cement admixture comprising a material obtained by heat-treating a CaO raw material, an Al ₂ O ₃ raw material, and a CaSO ₄ raw material, and an expanded material containing free lime, calcium sulfoaluminate, and anhydrous gypsum. While the invention of claim 1) have been described, the particle size of the "expansion material is not particularly limited, usually, the 1500～4500Cm ² / g in Blaine specific surface area is preferably .1500cm less than ² / g unreacted substances remain a long time, may reduce durability, fast hydration exceeds 4500cm 2 / ^g, a predetermined expansion Sometimes ability can not be obtained. "From being described as (paragraph [0013]), it is not intended to use the inflation material (expandable member) having a Blaine specific surface area greater than 4500cm 2 / ^g Moreover, a specific expansion material (expansion material) is not used for the purpose of preventing the generation of bubbles.

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

As a result of repeating various studies to solve the above problems, the present inventor employs a cement composition for grout that uses a specific expansion material, contains a pozzolanic fine powder, and further uses a specific water reducing agent. As a result, the inventors have obtained knowledge that the above problems can be solved, and have completed the present invention.
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. In the cement composition for grout, comprising two or more selected water reducing agents (excluding a water reducing agent comprising two kinds of naphthalene sulfonic acid type water reducing agent and polycarboxylic acid type water reducing agent). The material contains a calcium aluminoferrite type expansion material having a Blaine specific surface area value of 2,000 cm ² / g or more and a calcium sulfoaluminate type expansion material having a Blaine specific surface area value of more than 4,500 cm ² / g. , and the said expansion member is, 2,000~6,000cm ² / g calcium alumino ferrite expansion at Blaine specific surface area And a said grout cement composition comprising a calcium monkey follower aluminate expansion material 5,000~9,000cm 2 / ^g in Blaine specific surface area value, said calcium alumino ferrite expansion material, cement, The cement composition for grout, which is 1 to 4 parts in 100 parts of an expanding material and a binding material (hereinafter referred to as a binding material) made of pozzolanic fine powder, and the calcium sulfoaluminate-based expanding material is a binding material It is the cement composition for grout which is 0.5 to 2 parts in 100 parts, and the total amount of the calcium aluminoferrite-based expansion material and the calcium sulfoaluminate-based expansion material is 3 parts in 100 parts of the binder. -6 parts of the cement composition for grout, wherein the pozzolana fine powder is 3-10 parts in 100 parts of a binder. It is a cement composition, and further, the cement is a cement composition for grout, which is an early-strength Portland cement, and is a grout material using the cement composition for grout.

  By using the cement composition for grout of the present invention, it is possible to provide a grout mortar that maintains good fluidity, does not generate bubbles, and has high strength.

Hereinafter, the present invention will be described in detail.
Parts and% used in the present invention are based on mass unless otherwise specified.
In the present invention, grout mortar includes grout paste.
In the present invention, an expansion material comprising a cement, a calcium aluminoferrite-based expansion material and a calcium sulfoaluminate-based expansion material, a pozzolanic fine powder, a foaming agent, a naphthalenesulfonic acid-based water reducing agent, a melaminesulfonic acid-based material A cement composition for grout containing two or more water reducing agents selected from the group consisting of a water reducing agent, a lignin sulfonic acid type water reducing agent, and a polycarboxylic acid type water reducing agent, and a fine aggregate as necessary. It mix | blends and knead | mixes with water and prepares grout mortar.
As the expansion material used in the present invention, mainly from the viewpoint of expansion, fluidity, and water retention, calcium aluminoferrite-based expansion material, and mainly the effect of suppressing expansion and generation of bubbles. Calcium sulfoaluminate expansion material is used in combination.
The expansion material is a mixture of 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 is generally 1,100 using an electric furnace or a rotary kiln. Manufactured by heat treatment at ˜1,600 ° C. 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 as the raw material limestone or hydrated lime or the _like, Al 2 _{O 3} as the raw material bauxite, aluminum residual ash and the like, _Fe 2 _{O 3} as a raw material of copper Karami and commercial iron oxide has And, two as CaSO ₄ material Examples thereof include water gypsum, hemihydrate gypsum, and anhydrous gypsum.
A calcium aluminoferrite-based expansion material (hereinafter referred to as C ₄ AF expansion material) is a substance obtained by heat treatment of a CaO raw material, an Al ₂ O ₃ raw material, an Fe ₂ O ₃ raw material, and a CaSO ₄ raw material, and is free It is an expanding material containing lime, calcium aluminoferrite, and anhydrous gypsum, and the ratio thereof is not particularly limited. However, in 100 parts of the expanding material, 30-60 parts are preferable, and 40-50 parts of free lime is preferable. More preferred. Further, 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 aluminoferrite of the present invention is a general term for CaO—Al ₂ O ₃ —Fe ₂ O ₃ compounds and is not particularly limited, but generally, CaO is C, and Al ₂ O ₃ is When A and Fe ₂ O ₃ are F, compounds represented by C ₄ AF and C ₆ AF ₂ are well known. Usually, it may be considered as C ₄ AF.
Fineness of C ₄ AF expansion material, Blaine specific surface area value (hereinafter, referred to as Blaine value) is preferably 2,000 cm ² / g or more, 2,000~6,000cm ² / g is more preferable. If it is less than 2,000 cm ² / g, the amount of expansion is large and bleeding is likely to occur, and if it exceeds 6,000 cm ² / g, the time for maintaining good fluidity tends to be shortened.
The amount of the C ₄ AF expansion material used is preferably 1 to 4 parts, more preferably 2 to 3 parts, in 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.
The calcium sulfoaluminate-based expansion material (hereinafter referred to as CSA expansion material) is a substance 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 sulfoaluminum. Although it is an expansion | swelling substance containing an nate and an anhydrous gypsum and the ratio is not specifically limited, 5-40 parts are preferable in 100 parts of expansion | swelling substances, and 15-35 parts are more preferable. The calcium sulfoaluminate is preferably 10 to 40 parts, more preferably 15 to 35 parts. Furthermore, 30-60 parts of anhydrous gypsum is preferable, and 40-50 parts is more preferable.
The calcium sulfoaluminate of the present invention is a general term for an expansion material composed mainly of free lime, Auin, and anhydrous gypsum, which is made of CaO—CaSO ₄ —Al ₂ O ₃ and is not particularly limited. In general, a compound represented by CSA is well known when C is CaO, A is Al ₂ O ₃ and S is CaSO ₄ .
Fineness of CSA expansion material, preferably in excess of 4,500cm ² / g in Blaine value, 5,000~9,000cm ² / g is more preferable. If the amount is less than 4,500 cm ² / g, the effect of suppressing foam generation may be small, and the amount of expansion may be larger than necessary. Even if the amount exceeds 9,000 cm ² / g, the improvement of the effect can 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 the amount is less than 0.5 part, the effect of suppressing the generation of bubbles may not be obtained.
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, it may not show appropriate expansion, and if it exceeds 6 parts, good expandability may not be obtained.
The pozzolanic fine powder used in the present invention is not particularly limited, and examples thereof include granulated blast furnace slag, fly ash, and silica fume. Among them, silica fume, which is granulated silica fume, prevents bleeding. From the standpoint of obtaining good fluidity in accordance with strength development.
The fineness of the pozzolanic fine powder is preferably 3,000 cm ² / g or more in terms of Blaine value. If it is less than 3,000 cm ² / g, sufficient effects may not be obtained in terms of good fluidity of the grout mortar, prevention of bleeding and strength development.
The amount of pozzolanic fine powder used is preferably 3 to 10 parts in 100 parts of the binder. If it is less than 3 parts, the effect of preventing bleeding is low, and even if it exceeds 10 parts, further effects cannot be expected.
In the present invention, in order to obtain 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 foaming 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 part, the amount of expansion may be extremely small. If the amount exceeds 0.003 part, 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, ultra-early strength, low heat, and moderate heat, various portland cements mixed with blast furnace slag, fly ash, silica, limestone fine powder, etc. Examples thereof include mixed cements, waste-use type cements, so-called eco-cements, etc. Among them, early-strength cements are 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-based water reducing agent, melamine sulfonic acid-based water reducing agent An agent, a lignin sulfonic acid water reducing agent, and a polycarboxylic acid water reducing agent 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 a naphthalene sulfonic acid-based water reducing agent, a melamine sulfonic acid-based water reducing agent, and a lignin sulfonic acid-based water reducing agent, a naphthalene sulfonic acid-based water reducing agent and a melamine sulfonic acid-based water reducing agent. More preferably, it is based on an agent.
The amount of naphthalene sulfonic acid 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 water reducing agent used is 0.2 to 0.4 part. Is preferred. If the naphthalenesulfonic acid-based water reducing agent is less than 0.8 part, high fluidity may not be obtained, and if it exceeds 2.0 part, material separation may occur. In addition, if the melamine sulfonic acid water reducing agent is outside this range, appropriate fluidity may not be obtained.
Furthermore, it is possible to use oxycarboxylic acid or a salt thereof, sugars such as dextrin and sucrose, and those having delay properties such as inorganic salts.
In addition, the use form of the water reducing agent can be either liquid or powder, but when used as a premix product, powder is preferable, and the amount added is 1 with respect to 100 parts of the binder. 0.0 to 2.5 parts are 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, crushed sand, silica sand and the like can be used, and when used as a premix product, those dry sands are preferred, and their particle size In view of fluidity, the maximum particle size is preferably 1.2 mm.
The amount of fine aggregate used is preferably 70 to 150 parts with respect to 100 parts of the binder. If it is less than 70 parts, the amount of shrinkage may increase, and if it exceeds 150 parts, the strength and fluidity may decrease.
Although the amount of kneading water used by this invention is not specifically limited, Usually, 25-45% is preferable at a water / binder ratio, and 30-40% is more preferable. 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.

表１より、ブレーン値で２，０００ｃｍ^２／ｇ以上の膨張材Ａ（Ｃ_４ＡＦ膨張材）とブレーン値で４，５００ｃｍ^２／ｇを超える膨張材Ｂ（ＣＳＡ膨張材）を併用した実験Ｎｏ．１−２〜１−５、Ｎｏ．１−７〜１−１０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。
Ｃ_４ＡＦ膨張材は、結合材１００部中、１部から効果が顕著になり、４部を超えると流動性は高くなるが、圧縮強度が低下し、長さ変化率が大きくなりすぎるから、１〜４部が好ましい。
ＣＳＡ膨張材は、結合材１００部中、０．５部から効果が顕著になり、２部を超えると圧縮強度の向上は頭打ちになるから、０．５〜２部が好ましい。
これに対して、膨張材Ｂ（ＣＳＡ膨張材）のみで、膨張材Ａ（Ｃ_４ＡＦ膨張材）を使用しない実験Ｎｏ．１−１の比較例のグラウトモルタルは、時間の経過に従って流動性が低下し、泡の発生があり、長さ変化率が小さい。また、膨張材Ａ（Ｃ_４ＡＦ膨張材）のみで膨張材Ｂ（ＣＳＡ膨張材）を使用しない実験Ｎｏ．１−６の比較例のグラウトモルタルは、流動性は高いが、泡の発生があり、体積膨張率が小さい。
したがって、ブレーン値で２，０００ｃｍ^２／ｇ以上のＣ_４ＡＦ膨張材とブレーン値で４，５００ｃｍ^２／ｇを超えるＣＳＡ膨張材を組み合わせてグラウトモルタルに含有させることが好ましい。In 100 parts of binder, the expansion material shown in Table 1, 6 parts of pozzolanic fine powder, 0.0014 part of foaming agent, 1.3 parts of naphthalene sulfonic acid-based water reducing agent, 0.2 part of melamine sulfonic acid-based water reducing agent, and fine Mix 100 parts of aggregate to prepare a grout material, add water to a water / binder ratio of 32%, knead using a high-speed hand mixer to make a grout mortar, and measure its fluidity Then, the occurrence of bubbles was evaluated.
The prepared grout mortar was placed in a mold in a constant temperature and humidity chamber of 20 ° C. and 80% RH, and the curing after 1 day was a 20 ° C. water curing, the rate of change in length, the volume expansion rate, And the compressive strength was measured. The results are also shown in Table 1.
<Materials used>
Cement: Early strength Portland cement, commercial product expansion material A: C ₄ AF expansion material, brain value 2,500 cm ² / g, commercial product expansion material B: CSA expansion material, brain value 6,050 cm ² / g
Pozzolanic fine powder: Silica fume granulated product, commercial product foaming agent: aluminum powder, commercial product water reducing agent a: naphthalene sulfonic acid type water reducing agent, commercial product water reducing agent b: melamine sulfonic acid type water reducing agent, commercial product fine aggregate: lime Sand aggregate, density 2.62 g / cm ³ , 1.2 mm under-grade <measuring method>
Flowability: Measured according to the People's Republic of China National Standard GB2419-81 “Mortar fluidity measurement method”. Changes in fluidity with time are measured by re-grown grout mortar with a high-speed hand mixer for 10 seconds each time. : Luminous length change rate: Measured according to Japanese Standards Association JIS A 6202 “Expandable material for concrete”, Annex 1 “Expansion test method using mortar of expanded material”. Measured value at 28 days of age Volume expansion rate: Directional expansion rate, according to the National Standard GBJ119 “Technology for Applied Concrete Additives”, after placing in a constant temperature and humidity chamber at 20 ° C. and 80% RH 1 Measures the value of the day Compressive strength: Measured according to the compressive strength, National Standard GB177 “Cement Mortar Strength Test” of the People's Republic of China

From Table 1, experiment No in combination an expansion material B to 2,000 cm ² / g or more expandable material A in Blaine value and _(C 4 AF expansion material) exceeds 4,500cm ² / g in Blaine value (CSA Expansive) . 1-2 to 1-5, no. It can be seen that the grout mortars of Examples 1-7 to 1-10 have excellent fluidity, no bubbles are generated, the length change rate and the volume expansion rate are appropriately maintained, and the compressive strength is high. .
The effect of C ₄ AF expansion material is significant from 1 part in 100 parts of the binder, and if it exceeds 4 parts, the fluidity increases, but the compressive strength decreases, and the length change rate becomes too large. 1-4 parts are preferred.
The effect of the CSA expansion material is prominent from 0.5 parts 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, Experiment No. which uses only the expansion material B (CSA expansion material) and does not use the expansion material A (C ₄ AF expansion material). In the grout mortar of Comparative Example 1-1, the fluidity decreases with the passage of time, bubbles are generated, and the rate of change in length is small. In addition, Experiment No. in which the expansion material B (CSA expansion material) is not used only with the expansion material A (C ₄ AF expansion material). The grout mortar of Comparative Example 1-6 has high fluidity, but foam is generated and the volume expansion coefficient is small.
Accordingly, it is contained in combination CSA expansion material at 2,000 cm ² / g or more _C 4 AF expansion material and Blaine exceeds 4,500cm ² / g in Blaine value grout mortar is preferable.

表２より、ポゾラン微粉末を、結合材１００部中、３〜１０部含有させた実験Ｎｏ．２−２〜２−４、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。
これに対して、ポゾラン微粉末を含有しない実験Ｎｏ．２−１の比較例のグラウトモルタルは、流動性が低く、体積膨張率が大きく、圧縮強度が低い。
したがって、ポゾラン微粉末を、結合材１００部中、３〜１０部含有させてグラウトモルタルとすることが好ましい。In 100 parts of binder, expansion material A2 part, expansion material B2 part, pozzolanic fine powder shown in Table 2, foaming agent 0.0014 part, water reducing agent a1.3 part and water reducing agent b0.2 part, and fine aggregate 100 The same procedure as in Example 1 was conducted except that the grout material was prepared by mixing the parts. The results are also shown in Table 2.

From Table 2, the experiment No. 1 containing 3 to 10 parts of pozzolana fine powder in 100 parts of the binder was obtained. 2-2 to 2-4, no. It can be seen that the grout mortars of Examples 1 to 3 have excellent fluidity, no bubbles are generated, the length change rate and the volume expansion rate are appropriately maintained, and the compressive strength is high.
On the other hand, Experiment No. which does not contain pozzolanic fine powder. The grout mortar of the comparative example 2-1 has low fluidity, a large volume expansion coefficient, and low compressive strength.
Therefore, it is preferable to contain 3 to 10 parts of pozzolana fine powder in 100 parts of the binder to make grout mortar.

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。
これに対して、減水剤ａ（ナフタレンスルホン酸系減水剤）を含有するが、減水剤ｂ、ｃ、ｄを含有しない実験Ｎｏ．３−４の比較例のグラウトモルタルは、流動性は大きいが、泡の発生があり、体積膨張率が負になってしまう。
減水剤ｂ（メラミンスルホン酸系減水剤）を含有するが、減水剤ａ、ｃ、ｄを含有しない実験Ｎｏ．３−５の比較例のグラウトモルタルは、時間の経過に従って流動性が大きく低下し、泡の発生があり、体積膨張率が負になってしまう。
減水剤ｃ（リグニンスルホン酸系減水剤）を含有するが、減水剤ａ、ｂ、ｄを含有しない実験Ｎｏ．３−６の比較例のグラウトモルタルは、流動性が低く、泡の発生があり、体積膨張率が負になってしまい、圧縮強度も小さい。
減水剤ｄ（ポリカルボン酸系減水剤）を含有するが、減水剤ａ、ｂ、ｃを含有しない実験Ｎｏ．３−１４の比較例のグラウトモルタルは、少量の添加で流動性は改善されるが、泡の発生があり、体積膨張率が負になってしまい、圧縮強度も小さい。
なお、二種を組み合わせた場合でも、減水剤ａ（ナフタレンスルホン酸系減水剤）及び減水剤ｄ（ポリカルボン酸系減水剤）の二種からなる減水剤を含有する実験Ｎｏ．３−７の比較例のグラウトモルタルは、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、圧縮強度は高いが、フローダウンが大きく流動性が阻害されてしまう。したがって、ナフタレンスルホン酸系減水剤とポリカルボン酸系減水剤のみの組合せは、流動性の点で好ましくなく、この流動性を改善するためには、実験Ｎｏ．３−８、Ｎｏ．３−１１、Ｎｏ．３−１３のように他にもう一種（減水剤ｂ、ｃ）以上を組み合わせる必要がある。A grout material is prepared by mixing 100 parts of the binder, 2 parts of the expansion material A, 2 parts of the expansion material B, 6 parts of pozzolanic powder, 0.0014 part of the foaming agent, 100 parts of the water reducing agent shown in Table 3, and 100 parts of fine aggregate. Except that, the same procedure as in Example 1 was performed. The results are also shown in Table 3.
<Materials used>
Water reducing agent c: Lignin sulfonic acid water reducing agent, commercially available water reducing agent d: Polycarboxylic acid water reducing agent, commercially available product

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 No. 2 containing a combination of two or more selected from the group consisting of (excluding two combinations of naphthalenesulfonic acid-based water reducing agent and polycarboxylic acid-based water reducing agent). 3-1 to 3-3, no. 1-3, no. It can be seen that the grout mortars of Examples 3-8 to 3-13 have excellent fluidity, no bubbles are generated, the length change rate and the volume expansion rate are appropriately maintained, and the compressive strength is high. .
On the other hand, although it contains the water reducing agent a (naphthalenesulfonic acid-based water reducing agent), it does not contain the water reducing agents b, c, d. The grout mortar of Comparative Example 3-4 has high fluidity, but bubbles are generated, and the volume expansion coefficient becomes negative.
Experiment No. containing water reducing agent b (melamine sulfonic acid-based water reducing agent) but not containing water reducing agents a, c, d. In the grout mortar of Comparative Example 3-5, the fluidity greatly decreases with the passage of time, bubbles are generated, and the volume expansion coefficient becomes negative.
Experiment No. containing water reducing agent c (lignin sulfonic acid-based water reducing agent) but not containing water reducing agents a, b and d. The grout mortar of Comparative Example 3-6 has low fluidity, bubbles are generated, the volume expansion coefficient becomes negative, and the compressive strength is small.
Experiment No. containing water reducing agent d (polycarboxylic acid-based water reducing agent) but not containing water reducing agents a, b, c. In the grout mortar of Comparative Example 3-14, the flowability is improved by adding a small amount, but bubbles are generated, the volume expansion coefficient becomes negative, and the compressive strength is also small.
In addition, even when combining 2 types, Experiment No. containing the water reducing agent which consists of 2 types, water reducing agent a (naphthalenesulfonic acid type water reducing agent) and water reducing agent d (polycarboxylic acid type water reducing agent). In the grout mortar of Comparative Example 3-7, no foam is generated, 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 inhibited. Therefore, the combination of only the naphthalene sulfonic acid-based water reducing agent and the polycarboxylic acid-based water reducing agent is not preferable in terms of fluidity. 3-8, no. 3-11, no. It is necessary to combine another kind (water reducing agents b and c) or more in addition to 3-13.

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。
これに対して、膨張材を含有しない実験Ｎｏ．４−１の比較例のグラウトモルタルは、泡の発生があり、長さ変化率が小さい。
したがって、Ｃ_４ＡＦ膨張材とＣＳＡ膨張材を合計量で、結合材１００部中、３〜６部含有させてグラウトモルタルとすることが好ましい。In 100 parts of binder, the expansion material shown in Table 4 consisting of 50 parts of expansion material A and 50 parts of expansion material B, 6 parts of pozzolanic fine powder, 0.0014 part of foaming agent, 1.3 parts of water reducing agent and 0.2 part of water reducing agent b 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.

From Table 4, the experiment No. 1 in which 3 to 6 parts of the expansion material A and the expansion material B were contained in a total amount of 100 parts of the binding material. 4-2-4-4, no. It can be seen that the grout mortars of Examples 1 to 3 have excellent fluidity, no bubbles are generated, the length change rate and the volume expansion rate are appropriately maintained, and the compressive strength is high.
On the other hand, Experiment No. which does not contain an expanding material. The grout mortar of the comparative example of 4-1 has generation | occurrence | production of a bubble, and its length change rate is small.
Therefore, 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 make grout mortar.

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．５−１、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。In 100 parts of binder, expandable material A2 parts, expandable material B2 parts, pozzolanic fine powder 6 parts, foaming agent shown in Table 5, water reducing agent a1.3 parts and water reducing agent b0.2 parts, and fine aggregate 100 parts. The same procedure as in Example 1 was performed except that the grout material was prepared by mixing. The results are also shown in Table 5.

From Table 5, the experiment No. in which 0.0003 to 0.003 part of the foaming agent was contained in 100 parts of the binder. 5-1. 5-2, no. It can be seen that the grout mortars of Examples 1 to 3 have excellent fluidity, no bubbles are generated, the length change rate and the volume expansion rate are appropriately maintained, and the compressive strength is high.

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４，５００ｃｍ^２／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。
比較例
結合材１００部中、膨張材Ａ２部、膨張材Ｅ２部、ポゾラン微粉末６部、発泡剤０．００１４部、減水剤ａ１．３部と減水剤ｂ０．２部、及び細骨材１００部を混合してグラウト材料を調製したこと以外は実施例１と同様に行った。結果を表７に併記する。
膨張材Ｅ：ＣＳＡ膨張材、プレーン４，３８０ｃｍ^２／ｇ

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４，５００ｃｍ^２／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。In 100 parts of binder, expansion material A2 and expansion material C2, part of expansion material A2 and expansion material D2, pozzolane fine powder 6 parts, foaming agent 0.0014 parts, water reducing agent a1.3 parts and water reducing agent b0 The same procedure as in Example 1 except that 2 parts and 100 parts of fine aggregate were mixed to prepare a grout material. The results are also shown in Table 6.
Expandable material C: CSA expanded material, brain value 4,580 cm ² / g
Expandable material D: CSA expanded material, brain value 5,070 cm ² / g

From Table 6, the brane value of the CSA expansion material is the experiment No. of the example. Even when smaller than 1-3, Experiment No. The grout mortar using the CSA expansion material (expansion material C and expansion material D) exceeding 4,500 cm ² / g in the examples of 6-1 and 6-2 has excellent fluidity, and the generation of bubbles. It can be seen that the length change rate and the volume expansion rate are appropriately maintained, and the compressive strength is high.
Comparative Example In 100 parts of binder, expansion material A2 parts, expansion material E2 parts, pozzolanic fine powder 6 parts, foaming agent 0.0014 parts, water reducing agent a1.3 parts and water reducing agent b0.2 parts, and fine aggregate 100 The same procedure as in Example 1 was conducted except that the grout material was prepared by mixing the parts. The results are also shown in Table 7.
Expansion material E: CSA expansion material, plain 4,380 cm ² / g

As shown in Table 7, Experiment No. In the grout mortar using the CSA expansion material (expansion material E) having a brain value of 4,500 cm ² / g or less in the comparative example of 7-1, generation of bubbles was observed.

  As described above, the grout mortar (grout material) using the cement composition for grout of the present invention has excellent fluidity, does not generate bubbles, has a moderate rate of change in length and volume expansion. Because of its high compressive strength, civil engineering and construction work, in particular, fine voids in concrete structures, voids in the backlash method, repair and reinforcement of structures, under base plates of machinery and equipment, under track decks, etc. It can be used for construction method etc.

Claims (8)

Two 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 containing at least one kind of water reducing agent (excluding a water reducing agent comprising two kinds of naphthalene sulfonic acid type water reducing agent and polycarboxylic acid type water reducing agent), It contains a calcium aluminoferrite-based expansion material having a specific surface area value of 2,000 cm ² / g or more and a calcium sulfoaluminate-based expansion material having a Blaine specific surface area value of more than 4,500 cm ² / g. Cement composition for grout. The expandable material is, 5,000~9,000cm ² / g calcium monkey follower aluminate with calcium alumino ferrite expanding material and Blaine specific surface area value of 2,000~6,000cm ² / g in Blaine specific surface area The cement composition for grout according to claim 1, comprising an inflating material. The said calcium aluminoferrite type expansion | swelling material is 1-4 parts in 100 parts of binders which consist of cement, an expansion | swelling material, and a pozzolanic fine powder, The range of Claim 1 or 2 characterized by the above-mentioned. Cement composition for grout. The said calcium sulfo aluminate type expansion | swelling material is 0.5-2 parts in 100 parts of binders which consist of cement, an expansion | swelling material, and a pozzolanic fine powder, The range 1st-3rd characterized by the above-mentioned. The cement composition for grout as described in any one of claim | item. The total amount of the calcium aluminoferrite-based expansion material and the calcium sulfoaluminate-based expansion material is 3 to 6 parts in 100 parts of a binder composed of cement, expansion material, and pozzolanic fine powder. The cement composition for grout according to any one of claims 1 to 4. The said pozzolanic fine powder is 3-10 parts in 100 parts of binders which consist of cement, an expansion | swelling material, and a pozzolanic fine powder, The range of any one of Claims 1-5 characterized by the above-mentioned. The cement composition for grout as described. The cement composition for grout according to any one of claims 1 to 6, wherein the cement is an early-strength Portland cement. A grout material obtained by using the cement composition for grout according to any one of claims 1 to 7.