Grout material

Abstract

To provide a grout material having favorable fluidity and being less likely to undergo material separation.SOLUTION: A grout material comprises fine powder that has passed through a sieve having an opening of 90 μm and that contains TiO2 as a chemical component. Preferably, the fine powder contains 0.03 mass% or more of TiO2 as a chemical component.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to grout materials.

Background Art

[0002] As a cement-based grout material used in the civil engineering and construction fields, it is common to add a water reducing agent to cement. Further, a calcium sulfoaluminate-based expansion agent, a lime-based expansion agent, or a foaming agent such as aluminum powder is added as necessary to make a non-shrinking material, and river sand, silica sand, etc. are blended therein, and it is widely used for filling fine voids in concrete structures, voids in the reverse casting method, repair and reinforcement parts of structures, under the base plates of mechanical devices, under the track slabs, etc.

[0003] When filling a void with a grout material, for example, when directly filling a relatively wide void of 10 cm or more, it can be filled if it has a certain degree of fluidity. However, when filling a narrower gap, for example, a void of about several centimeters, higher fluidity is required.

[0004] Therefore, for example, Patent Document 1 discloses that a grout material containing a binder containing cement and a predetermined expansion agent and an aggregate has good fluidity and high durability.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, when using a grout material with high fluidity such as that of Patent Document 1, there is a problem that material separation is likely to occur.

[0007] Accordingly, an object of the present invention is to provide a grout material having good fluidity and being less likely to cause material separation. **Means for Solving the Problems**

[0008] As a result of intensive studies to solve the above problems, the present inventors have conceived the following present invention and found that the problems can be solved. That is, the present invention is as follows.

[0009] [1] A grout material in which fine powder passing through a sieve with an opening size of 90 μm contains TiO2 as a chemical component. [2] The grout material according to [1], wherein the fine powder contains 0.03% by mass or more of TiO2 as a chemical component. [3] The grout material according to [1] or [2], wherein the TiO2 content of the coarse powder remaining without passing through a sieve with an opening size of 90 μm is smaller than the TiO2 content of the fine powder as a chemical component. [4] The grout material according to any one of [1] to [3], wherein the fine powder contains 0.05 to 5% by mass of P2O5 as a chemical component. [5] The grout material according to any one of [1] to [4], wherein the fine powder contains 10 to 40% by mass of particles having a particle size of 5 μm or less. [6] The grout material according to any one of [1] to [5], containing a foaming substance and / or a water reducing agent. **Advantages of the Invention**

[0010] According to the present invention, it is possible to provide a grout material having good fluidity and being less likely to cause material separation. **Modes for Carrying Out the Invention**

[0011] Hereinafter, an embodiment according to the present invention (hereinafter sometimes referred to as "the present embodiment") will be described. In the present specification, "parts" and "%" are based on mass unless otherwise specified.

[0012] The grout material according to this embodiment is a grout material in which the fine powder passing through a sieve with an opening size of 90 μm contains TiO2 as a chemical component. By containing TiO2 as a chemical component in the fine powder, it becomes possible to impart thixotropy when used as a grout material, and while showing good filling properties, it becomes possible to make it difficult for material separation to occur.

[0013] In addition, since the fine powder with a size smaller than 90 μm of the sieve has relatively high initial reactivity, it is presumed that the function of TiO2, that is, the above-mentioned thixotropy, is more likely to be exhibited because a predetermined amount of TiO2 is contained in the fine powder.

[0014] From the viewpoint of more favorably exhibiting thixotropy, the fine powder passing through a sieve with an opening size of 90 μm preferably contains 0.03 mass% or more of TiO2 as a chemical component, more preferably contains 0.03 to 5 mass%, and even more preferably contains 0.05 to 3 mass%. To contain 0.03 mass% or more of TiO2 as a chemical component, a material containing TiO2 (for example, titanium oxide) may be used as the material.

[0015] In this embodiment, the TiO2 content as a chemical component of the coarse powder remaining without passing through a sieve with an opening size of 90 μm is preferably smaller than the TiO2 content as a chemical component of the fine powder. That is, when the TiO2 content as a chemical component of the fine powder is larger than the TiO2 content of the coarse powder, the function of TiO2 in the highly reactive fine powder is more likely to be exhibited, and it becomes easier to impart thixotropy, resulting in good filling properties and making it difficult for material separation to occur.

[0016] From the viewpoint of more effectively exhibiting the function of TiO2 in the fine powder, the ratio (B / A) of the TiO2 content (B) of the fine powder to the TiO2 content (A) of the coarse powder is preferably 1.1 to 100, and more preferably 1.5 to 55.

[0017] The grout material according to this embodiment preferably contains 0.05 to 5% by mass of P2O5 as a chemical component in the fine powder that has passed through a sieve with an opening size of 90 μm, and more preferably contains 0.08 to 3% by mass. By setting the content of P2O5 to 0.05 to 5% by mass, it becomes easier to maintain fluidity and suppress phenomena such as flow-down.

[0018] To make the material contain 0.05 to 5% by mass of P2O5 as a chemical component, a material containing P2O5 (for example, calcium phosphate) can be used as the material.

[0019] In this embodiment, the content of P2O5 as a chemical component in the coarse powder is preferably smaller than the content of P2O5 as a chemical component in the fine powder. That is, when the content of P2O5 as a chemical component in the fine powder is larger than the P2O5 content in the coarse powder, the function of P2O5 in the highly reactive fine powder is more likely to be exerted.

[0020] From the viewpoint of more effectively exerting the function of P2O5 in the fine powder, the ratio (D / C) of the content of P2O5 in the fine powder (D) to the content of P2O5 in the coarse powder (C) is preferably 1.1 to 100, and more preferably 2 to 65.

[0021] The grout material of this embodiment preferably contains a foaming agent and / or a water reducing agent.

[0022] The foaming agent is used for the purpose of more effectively suppressing the settlement and shrinkage of the grout material that has not yet hardened after the grout material is constructed due to bleeding. The foaming agent is preferably a gas foaming agent that generates gas after kneading with water.

[0023] Examples of the gas foaming substances include oily substances such as vegetable oils and mineral oils. Further, examples of the gas foaming substances include powdery substances such as flaky aluminum powder surface-treated with stearic acid and aluminum powder produced by an atomizing method. Further, examples of the gas foaming substances include nitrogen gas foaming substances that foam nitrogen gas in an alkaline atmosphere, such as azo compounds, nitroso compounds, and hydrazine derivatives. Further, examples of the gas foaming substances include percarbonates such as sodium percarbonate, potassium percarbonate, and ammonium percarbonate, perborates such as sodium perborate and potassium perborate, permanganates such as sodium permanganate and potassium permanganate, and peroxide substances such as hydrogen peroxide.

[0024] As the above gas foaming substance, it is preferable to use aluminum powder surface-treated with stearic acid or the like because of its large sedimentation suppression effect.

[0025] From the viewpoint of further suppressing bleeding, the content ratio of the foaming substance is preferably 0.0001 to 1%, more preferably 0.0005 to 0.5%, and even more preferably 0.001 to 0.2% in the grout material.

[0026] The water reducing agent helps disperse each material and plays a role in making the fluidity of the kneaded grout material better.

[0027] The water reducing agent is not particularly limited, and examples thereof include naphthalene-based water reducing agents, melamine-based water reducing agents, amino sulfonic acid-based water reducing agents, and polycarboxylic acid-based water reducing agents, and these can be used alone or in combination.

[0028] Specific examples of water-reducing agents include, for example, as naphthalene-based water-reducing agents, products named "Reobuild SP-9 series" manufactured by NMB Co., Ltd., products named "Mighty 2000 series" manufactured by Kao Corporation, and products named "Sunflow HS-100" manufactured by Nippon Paper Industries Co., Ltd., etc. Examples of melamine-based water-reducing agents include products named "Seekament 1000 series" manufactured by Nippon Shika Co., Ltd. and products named "Sunflow HS-40" manufactured by Nippon Paper Industries Co., Ltd., etc. Examples of amino sulfonic acid-based water-reducing agents include products named "Paric FP-200 series" manufactured by Fujisawa Pharmaceutical Co., Ltd., etc. Examples of polycarboxylic acid-based water-reducing agents include products named "Reobuild SP-8 series" manufactured by NMB Co., Ltd., products named "Darlex Super 100PHX" manufactured by Grace Chemicals, and products named "Chupol HP-8 series", "Chupol HP-11 series", etc. manufactured by Takemoto Yushi Co., Ltd.

[0029] There are also powdered water-reducing agents. Specifically, as naphthalene-based water-reducing agents, products named "Mighty 100" manufactured by Kao Corporation, products named "Sanyo Levoron P" manufactured by Sanyo Chemical Industries Co., Ltd., and products named "Selflow 110P" manufactured by Daiichi Kogyo Seiyaku Co., Ltd., etc. can be mentioned. Examples of melamine-based water-reducing agents include "Melmment F10M" manufactured by BASF Pozolith Co., etc. Examples of polycarboxylic acid-based water-reducing agents include, for example, products named "Quinflow 750" manufactured by Mitsubishi Kasei Corporation and products named "CAD9000P" manufactured by Kao Corporation, etc.

[0030] From the perspective of better fluidity, the content ratio of the water-reducing agent is preferably 0.1 to 2% in terms of solid content in the grout material, more preferably 0.2 to 1.8%, and even more preferably 0.3 to 1.0%.

[0031] In this embodiment, the fine powder passing through a sieve with an opening size of 90 μm preferably contains 10 to 40% by mass of particles with a particle size of 5 μm or less, and more preferably 15 to 35% by mass. By containing 10 to 40% by mass of particles with a particle size of 5 μm or less, better thixotropy can be obtained.

[0032] In the grout material according to this embodiment, the fine powder that has passed through a sieve with a mesh size of 90 μm preferably contains CaO, SiO2, Al2O3, and Fe2O3 in addition to the aforementioned chemical components as chemical components. The content of CaO is preferably 10 to 70% by mass, SiO2 is preferably 10 to 50% by mass, Al2O3 is preferably 1 to 20% by mass, and Fe2O3 is preferably 0.1 to 40% by mass.

[0033] The grout material according to this embodiment can be produced, for example, by mixing a CaO raw material, an Al2O3 raw material, an Fe2O3 raw material, an SiO2 raw material, and a TiO2 raw material, and optionally a P2O5 raw material, firing to synthesize clinker, pulverizing using a ball mill, and then appropriately mixing fine aggregate, foaming agent, water reducing agent, etc. For mixing, mixing devices such as a tilting drum mixer, an omnimixer, a Henschel mixer, a V-type mixer, and a Nauta mixer can be used.

[0034] As the fine aggregate, commonly used fine aggregate can be used. Also, various admixtures can be mixed.

[0035] The content of the fine aggregate is preferably 50 to 350 parts by mass, more preferably 70 to 250 parts by mass, with respect to 100 parts by mass of the cement component obtained by subtracting the fine aggregate from the grout material. By the content of the fine aggregate being within the above range, the thick coating property can be enhanced.

[0036] As the CaO raw material, for example, calcium oxide powder, limestone powder can be used. As the Al2O3 raw material, for example, aluminum oxide powder, bauxite powder can be used. As the Fe2O3 raw material, for example, iron oxide powder can be used. As the SiO2 raw material, for example, silicon dioxide powder, silica powder can be used. As the TiO2 raw material, for example, titanium oxide powder can be used. As the P2O5 raw material, for example, calcium phosphate powder can be used.

[0037] Note that, from the viewpoint of efficiently exerting its function, the content of the fine powder is preferably 10 to 80% by mass, more preferably 20 to 70% by mass in the grout material.

[0038] The grout material of this embodiment can be used after being kneaded with water. The amount of kneading water at this time is not particularly limited because it varies depending on the purpose of use and the content ratio of each material, but it is preferably 10 to 70 parts, more preferably 14 to 65 parts, and even more preferably 16 to 60 parts with respect to 100 parts of the grout material. By the amount of kneading water being equal to or more than the above lower limit value, a decrease in fluidity can be suppressed, and an extremely large calorific value can be suppressed. Also, by the amount of kneading water being equal to or less than the above upper limit value, strength development can be ensured.

[0039] The method of kneading the grout material and water is not particularly limited, but it is preferable to use a hand mixer with a rotation speed of 900 rpm or more, a normal high-speed grout mixer, or a twin-shaft forced mixer.

[0040] For kneading with a hand mixer or a high-speed grout mixer, for example, it is preferable to put a predetermined amount of water in a container such as a pail or a mixer in advance, then put the grout mortar composition while rotating the mixer, and knead for 3 minutes or more.

[0041] Also, for kneading with a forced mixer, for example, it is preferable to put the grout mortar composition in the mixer in advance, put a predetermined amount of water while rotating the mixer, and knead for at least 4 minutes or more.

[0042] The kneaded grout material is usually pumped to the construction site by a manual injection gun, a diaphragm hand pump, or a mortar pump such as a squeeze type, and is filled and constructed to become a hardened body.

Examples

[0043] (Materials Used) · CaO raw material: limestone powder · Al2O3 raw material: bauxite powder · Fe2O3 raw material: iron oxide powder · SiO2 raw material: silica powder · TiO2 raw material: titanium oxide powder · P2O5 raw material: calcium phosphate powder · Foaming substance (gas foaming substance): flaky aluminum powder surface-treated with stearic acid, commercially available product · Water reducing agent: naphthalene-based water reducing agent, "Self Flow 110P" manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd. Water: tap water

[0044] The CaO raw material, Al2O3 raw material, Fe2O3 raw material, SiO2 raw material, and TiO2 raw material, P2O5 raw material were blended so that the chemical components of the fine powder and the coarse powder were in the ratios shown in Table 1, and then fired at 1,350 °C to synthesize clinker, which was pulverized using a ball mill to a Blaine specific surface area of 3,500 cm 2 / g to produce a cement component. For 100 parts by mass of the cement component, a grout material was prepared by mixing 200 parts by mass of fine aggregate, 45 parts by mass of water, 0.0025 parts by mass of gas foaming substance, and 0.5 parts by mass of water reducing agent.

[0045] The prepared grout material was sieved with a sieve having an opening of 90 μm, and the contents of the chemical components of the fine powder that passed through and the coarse powder remaining on the sieve were measured. For CaO, Al2O3, Fe2O3, and SiO2, measurement was performed by X-ray fluorescence spectrometry (XRF). For TiO2, P2O5, etc., measurement was also performed by X-ray fluorescence spectrometry (XRF). Note that the "other" components in the table are trace components such as SO3, MgO, Na2O, and K2O. Also, the content of the fine powder in the grout material was 35% by mass.

[0046] Also, among the fine powder that passed through the sieve having an opening of 90 μm, the ratio of the particles having a particle diameter of 5 μm or less obtained by the sieve having an opening of 5 μm was measured. The results are shown in Table 1.

[0047] For the prepared grout material, the porosity, bleeding amount, and fluidity were evaluated in the following filling tests. The results are shown in Table 1.

[0048] <Filling ratio of the filling test> In a box-shaped container with a length of 100 cm, a width of 100 cm, and a height of 5 cm, and having a Φ4 cm hole at the center of each of the two opposite sides, mortar (grout material) is poured in from one hole. When the mortar flows out from the other hole, the pouring of the mortar is terminated. After the mortar hardens, the container is removed, and for the upper surface of 100 cm × 100 cm, the filling ratio of the mortar is measured. To measure the filling ratio, a 100 cm × 100 cm vinyl sheet is prepared, pasted on the upper surface of the hardened body, and the unfilled part is marked. The marked part is cut off, and the weight of the vinyl sheet with only the filled part remaining is measured and calculated using the following formula. Filling ratio (%) = Weight of the vinyl sheet of the filled part (g) / Weight of the entire vinyl sheet (g) Note that a higher filling ratio is preferred.

[0049] <Bleeding ratio> In accordance with JSCE-F542, the bleeding ratio (%) was determined. The lower the bleeding ratio, the better the resistance to material separation.

[0050] <Fluidity> In accordance with JSCE-F541, the measurement was taken immediately after remixing (immediately after preparing the grout material) and 30 minutes later at the J14 funnel flow value under a 30°C environment.

[0051]

Table 1

Industrial applicability

[0052] The grout material of the present invention can be suitably used for filling fine voids in concrete structures, voids in the reverse casting method, repair and reinforcement parts of structures, under the base plates of mechanical devices, under track slabs, etc.

Claims

Claim 1 A fine powder that has passed through a sieve with an opening of 90 μm, and is a grout material containing TiO as a chemical component. ２ ​ Claim 2 The fine powder contains TiO as a chemical component ２ The grout material according to claim 1, which contains 0.03% by mass or more of ２ . Claim 3 The TiO content as the chemical composition of the coarse powder remaining without passing through a sieve with an opening of 90 μm ２ is less than the TiO content as the chemical composition of the fine powder. The grout material according to claim 1 or 2 ２ wherein the TiO content is less than the TiO content as the chemical composition of the fine powder. Claim 4 The fine powder contains P as a chemical component ２ O ５ The grout material according to claim 1 or 2, which contains 0.05 to 5% by mass thereof. Claim 5 The grout material according to claim 1 or 2, wherein the fine powder contains 10 to 40% by mass of particles having a particle diameter of 5 μm or less. Claim 6 The grout material according to claim 1 or 2, containing a foaming substance and / or a water reducing agent.

Images