Mortar composition, repair material and concrete composition

Abstract

To provide a mortar composition which can be applied thickly well during trowel work or the like. The mortar composition contains fine powder that has passed through a sieve with 90 μm mesh and contains TiO2 as a chemical component, and the fine powder contains 0.03 to 3 mass % of TiO2 as a chemical component.

Description

[Technical field]

[0001] The present invention relates to a mortar composition, a repair material, and a concrete composition. [Background technology]

[0002] Mortar (mortar composition) applied to the walls of structures and other structures must be easy to work with with a trowel and adhere well to the surface. Plastering is carried out on a variety of surfaces, including base materials, finishing materials, repair materials, and joint materials, and the performance required for these materials is also diverse. Among these, the thickness of the coating (thick application) is often considered to be the most important required performance.

[0003] For example, Patent Document 1 proposes a technique aimed at a mortar that is excellent in terms of thick application properties and trowel workability. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2013-139349 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, this mortar had a problem in that the water contained in it was rapidly consumed by the hydration reaction with the cement and pozzolanic reactive substances. To solve this problem, it was considered to increase the amount of water-retaining agent, but adding an effective amount of this agent would make the mortar too viscous, which would reduce the workability of the plastering work.

[0006] In view of the above, an object of the present invention is to provide a mortar composition which can be applied thickly with ease during trowel work or the like. [Means for solving the problem]

[0007] As a result of intensive research aimed at solving the above problems, the present inventors have come up with the following invention and found that the above problems can be solved.

[0008] [1] A mortar composition in which fine powder passed through a 90 μm mesh sieve contains TiO2 as a chemical component. [2] The mortar composition according to [1], wherein the fine powder contains 0.03 mass% or more of TiO2 as a chemical component. [3] A mortar composition according to [1] or [2], wherein the TiO2 content as a chemical component of the coarse powder that did not pass through a sieve with a mesh size of 90 μm is smaller than the TiO2 content as a chemical component of the fine powder. [4] The mortar composition according to any one of [1] to [3], having a mini slump flow value (measurement temperature: 20°C ± 2°C) of 5 to 30 mm, measured using a mini slump flow cone conforming to JIS A 1171:2020 and in accordance with JIS A 1150:2020 "Test method for slump flow of concrete". [5] The mortar composition according to any one of [1] to [4], wherein the fine powder contains 0.05 to 5 mass % of P2O5 as a chemical component. [6] The mortar composition according to any one of [1] to [5], wherein the fine powder contains 10 to 40 mass % of particles having a particle diameter of 5 μm or less. [7] A repair material comprising the mortar composition according to any one of [1] to [6]. [8] A concrete composition comprising the mortar composition according to any one of [1] to [6], or the repair material according to [7]. Effect of the Invention

[0009] According to the present invention, it is possible to provide a mortar composition which can be applied thickly with ease during trowel work or the like. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, one embodiment of the present invention (hereinafter, may be referred to as "this embodiment") will be described. In this specification, "parts" and "%" are based on mass unless otherwise specified.

[0011] [Mortar composition] The mortar composition according to the present embodiment is a mortar composition in which fine powder passing through a sieve with an opening of 90 μm contains TiO2 as a chemical component. By containing TiO2 as a chemical component in the fine powder, it is possible to impart thixotropy when used for trowel work, etc., and it is possible to apply the mortar composition with a good thickness.

[0012] In addition, since fine powders with a sieve size of 90 μm or less have a relatively high initial reactivity, it is presumed that the inclusion of a certain amount of TiO2 in the fine powder makes it easier for the function of TiO2, namely, thixotropy (prevents sagging), to be exerted.

[0013] From the viewpoint of better exerting thixotropy, the fine powder passed through a sieve with an opening of 90 μm preferably contains 0.03 mass % or more of TiO2 as a chemical component, more preferably 0.03 to 5 mass %, and even more preferably 0.05 to 3 mass %. In order 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.

[0014] In this embodiment, the TiO2 content as a chemical component of the coarse powder that did not pass through the 90 μm mesh sieve is preferably smaller than the TiO2 content as a chemical component of the fine powder. In other words, 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 easily exerted, and thixotropy is more easily imparted, enabling good thickening.

[0015] In order to more effectively exert 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.

[0016] The mortar composition according to this embodiment is preferably a mortar composition having a mini slump flow value (measurement temperature: 20°C ± 2°C) of 5 to 30 mm when made into mortar, measured using a mini slump flow cone conforming to JIS A 1171:2020 and in accordance with JIS A 1150:2020 "Test method for slump flow of concrete". The composition of the mortar is preferably as described in the Examples.

[0017] It contains TiO2 as a chemical component and has a mini-slump flow value of 5 to 30 mm, which improves adhesion and enables it to be applied thickly when applied with a trowel.

[0018] The mini-slump flow value is preferably 5 to 30 mm, and more preferably 7 to 28 mm. The mini-slump flow value can be adjusted by adding mixing water, for example.

[0019] In the mortar composition according to the present embodiment, the fine powder passed through a sieve with an opening of 90 μm contains, as a chemical component, preferably 0.05 to 5 mass % of P2O5, more preferably 0.08 to 3 mass %. By making the P2O5 content 0.05 to 5 mass %, the mortar composition is easily released from the trowel when applied with a trowel, and the trowel workability can be improved.

[0020] In order to include 0.05 to 5 mass % of P2O5 as a chemical component, a material containing P2O5 (for example, calcium phosphate) may be used.

[0021] In this embodiment, the P2O5 content as a chemical component of the coarse powder is preferably smaller than the P2O5 content as a chemical component of the fine powder. In other words, when the P2O5 content as a chemical component of the fine powder is larger than the P2O5 content of the coarse powder, the function of P2O5 in the highly reactive fine powder is easily exerted, and the trowel releasability is more easily imparted, enabling good trowel work.

[0022] In order to more effectively exert the function of P2O5 in the fine powder, the ratio (D / C) of the P2O5 content (D) of the fine powder to the P2O5 content (C) of the coarse powder is preferably 1.1-100, more preferably 2-65.

[0023] The fine powder passed through a sieve with 90 μm openings preferably contains 10 to 40 mass % of particles having a particle diameter of 5 μm or less, more preferably 15 to 35 mass %. By containing 10 to 40 mass % of particles having a particle diameter of 5 μm or less, the thixotropy can be improved, and the thick buildability can be improved.

[0024] In the mortar composition according to this embodiment, the fine powder that has passed through a sieve with an opening of 90 μm preferably contains, as chemical components, CaO, SiO 2 , Al 2 O 3 , and Fe 2 O 3 in addition to the chemical components already described. The content of CaO is preferably 10 to 70 mass %, SiO2 is preferably 10 to 50 mass %, Al2O3 is preferably 1 to 20 mass %, and Fe2O3 is preferably 0.1 to 40 mass %.

[0025] The mortar composition according to this embodiment can be produced by, for example, mixing a CaO raw material, an Al2O3 raw material, an Fe2O3 raw material, a SiO2 raw material, a TiO2 raw material, and optionally a P2O5 raw material, calcining the mixture to synthesize clinker, pulverizing the mixture using a ball mill, and then mixing the mixture with fine aggregate. For mixing, a mixing device such as a tilting mixer, an omni mixer, a Henschel mixer, a V-type mixer, or a Nauta mixer can be used. As the fine aggregate, any fine aggregate that is commonly used can be used. Also, various admixtures can be mixed.

[0026] The content of the fine aggregate is preferably 50 to 350 parts by mass, more preferably 70 to 250 parts by mass, per 100 parts by mass of the cement component obtained by subtracting the fine aggregate from the mortar composition. By keeping the content of the fine aggregate within the above range, it is possible to improve the thick coating property.

[0027] The CaO raw material may be, for example, calcium oxide powder or limestone powder, the Al2O3 raw material may be, for example, aluminum oxide powder or bauxite powder, the Fe2O3 raw material may be, for example, iron oxide powder, the SiO2 raw material may be, for example, silicon dioxide powder or silica powder, the TiO2 raw material may be, for example, titanium oxide powder, and the P2O5 raw material may be, for example, calcium phosphate powder.

[0028] From the viewpoint of efficiently exerting its functions, the content of the fine powder in the mortar composition is preferably 10 to 80 mass %, and more preferably 20 to 70 mass %.

[0029] [Concrete composition] The concrete composition according to this embodiment includes the mortar composition of the present invention described above.

[0030] The coarse aggregate that can be contained in the concrete composition is not particularly limited, and any commonly used coarse aggregate can be used. In addition, various admixtures can be contained.

[0031] The concrete composition of the present embodiment may be prepared by mixing the respective materials at the time of construction, or may be prepared by mixing some or all of them in advance. The method of mixing the respective materials and water is not particularly limited, and the respective materials may be mixed at the time of construction, or may be mixed some or all of them in advance. Also, the remaining materials may be mixed after some of the materials are mixed with water.

[0032] As the mixing device, any existing device can be used, for example, a tilting mixer, an omni mixer, a Henschel mixer, a V-type mixer, a Nauta mixer, or the like.

[0033] The content of the coarse aggregate is preferably 30 to 450 parts by mass, and more preferably 50 to 350 parts by mass, relative to 100 parts by mass of the above-mentioned cement component. By keeping the content of the coarse aggregate within the above range, durability can be improved.

[0034] The amount of water used for mixing is not particularly limited because it varies depending on the purpose and application of use and the content of each material, but is preferably 10 parts by mass or more and 200 parts by mass or less, more preferably 12 parts by mass or more and 150 parts by mass or less, and even more preferably 14 parts by mass or more and 100 parts by mass or less, relative to 100 parts by mass of the cement component described above. By having the amount of water used for mixing be equal to or more than the lower limit, the fluidity is improved and the workability is improved. Also, by having the amount of water used for mixing be equal to or less than the upper limit, it is easier to ensure strength development.

[0035] The mortar composition or concrete composition according to this embodiment can be suitably used for plastering and the like as a base material, finishing material, repair material, joint material, and the like, and is particularly preferably used as a repair material. In particular, a repair material containing the mortar composition of the present invention is preferred. In this case, the mortar composition is preferably contained in an amount of 90 mass % or more, and more preferably 100 mass %.

[0036] When used as a repair material, examples of the repair target include hardened mortar or concrete parts that have deteriorated, been damaged, or been broken. Some repair areas are large, while others are small, and the repair method is selected based on the repair area and the amount of repair material applied. If the area is relatively large, spraying is often used. On the other hand, if the repair area is small, it is preferable to apply the repair material with a trowel. When performing partial cross-sectional repair, the area is small but the thickness of the repair material is often thick, so a method of applying multiple layers is used. EXAMPLES

[0037] (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 Fine aggregate: JIS standard sand Water reducing agent: Naphthalene-based water reducing agent, "Selflo-110P" manufactured by Daiichi Kogyo Seiyaku Co., Ltd. Water: Tap water

[0038] The CaO raw material, Al2O3 raw material, Fe2O3 raw material, SiO2 raw material, TiO2 raw material, and P2O5 raw material were mixed so that the chemical components of the fine and coarse powders were in the ratios shown in Table 1, and then calcined at 1,350°C to synthesize clinker. The clinker was then milled in a ball mill to a Blaine specific surface area of ​​3,500 cm. 2 / g to produce a cement component, and 100 parts by mass of the cement component was mixed with 200 parts by mass of fine aggregate, 45 parts by mass of water, and 0.5 parts by mass of a water reducing agent to prepare a mortar composition.

[0039] The prepared mortar composition was sieved through a sieve with 90 μm openings, and the contents of chemical components in the fine powder that passed through and the coarse powder that remained on the sieve were measured. CaO, Al2O3, Fe2O3, and SiO2 were measured by X-ray fluorescence diffraction (XRF). TiO2, P2O5, etc. were also measured by X-ray fluorescence diffraction (XRF). In addition, the "other" components in the table are trace components such as SO3, MgO, Na2O, K2O, etc. The content of fine powder in the mortar composition was 35 mass%.

[0040] In addition, the ratio of particles having a particle diameter of 5 μm or less that were obtained by sieving a 5 μm mesh size among the fine powder that had passed through a sieve with a 90 μm mesh size was measured. The results are shown in Table 1.

[0041] The mini-slump flow value of this mortar composition was measured in a room at 20°C. The mini-slump flow value was measured using a mini-slump flow cone conforming to JIS A 1171:2020 and in accordance with JIS A 1150:2020 "Test method for slump flow of concrete" (measurement temperature: 20°C ± 2°C). The results are shown in Table 1.

[0042] The mortar compositions thus prepared were evaluated for the following resistance to dripping and trowel releasability. The results are shown in Table 1.

[0043] <Anti-sagging properties (adhesive strength)> The adhesive strength (N / mm) after 7 days of application to a 300 x 300 mm concrete wall (slope 90°) with a trowel at a thickness of 40 mm 2 ) was measured (JSCE-K 561-2013). The adhesion strength was 0.3N / mm 2 Above is considered a pass.

[0044] <Soldering iron releasability> When the mortar composition was applied to a thickness of 40 mm on a 300 x 300 mm concrete wall (inclined at 90°) with a trowel, the mass (g) of the mortar composition attached to the trowel was measured. This measurement was carried out 10 times, and the average was used for evaluation. Trowel releasability of 20 g or less was considered to be acceptable.

[0045] [Table 1] [Industrial Applicability]

[0046] The mortar composition of the present invention can be suitably used for plastering and the like, as a base material, a finishing material, a repair material, a joint material, and the like.

Claims

1. The fine powder that passed through a sieve with 90 μm openings contained TiO ２ , CaO, SiO2, Al2O3, Fe2O3, The fine powder has TiO as a chemical component. ２ A mortar composition containing 0.03 to 3 mass% of the above.

2. TiO as a chemical component of the coarse powder that did not pass through a sieve with 90 μm openings ２ The content of TiO as a chemical component of the fine powder ２ The mortar composition according to claim 1, wherein the content is less than 1.

0.

3. 3. The mortar composition according to claim 1 or 2, wherein the mini slump flow value (measurement temperature: 20 ° C. ± 2 ° C.) measured in accordance with JIS A 1150: 2020 "Concrete slump flow test method" using a mini slump flow cone conforming to JIS A 1171: 2020 is 5 to 30 mm.

4. The fine powder contains P as a chemical component. ２ O ５ The mortar composition according to claim 1 or 2, containing 0.05 to 5 mass% of

5. The mortar composition according to claim 1 or 2, wherein the fine powder contains 10 to 40 mass% of particles having a particle diameter of 5 μm or less.

6. A repair material comprising the mortar composition according to claim 1 or 2.

7. A concrete composition comprising the mortar composition according to claim 1 or 2.

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