Mortar composition, repair material, and concrete composition

Abstract

To provide a mortar composition that can be applied in thick layers in a favorable manner during troweling or similar operations.SOLUTION: A mortar composition comprises fine powder that passes through a 90-μm sieve and that contains TiO2 as a chemical component, where the fine powder preferably contains 0.03 mass% or more of TiO2 as a chemical component.SELECTED DRAWING: None

Description

Technical Field

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

Background Art

[0002] For mortar (mortar composition) plastered on the wall surface of a structure, etc., workability of troweling work and adhesiveness to the construction target are required. The targets of plastering work are various, such as base materials, finishing materials, repair materials, joint materials, etc., and the performances required in relation to these are diverse. Among them, the coating thickness (thick application) is often an important required performance.

[0003] For example, in Patent Document 1, a technique aiming at mortar excellent in thick coating property and troweling workability has been proposed.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, this mortar has a problem that the contained kneading water is rapidly consumed by the hydration reaction with cement or pozzolanic reactive substances. Therefore, an increase in the water retention agent is considered, but when an effective amount thereof is added, there is a problem that the viscosity becomes too high and the plastering workability deteriorates.

[0006] From the above, an object of the present invention is to provide a mortar composition that can be well thick-applied during troweling work or the like.

Means for Solving the Problems

[0007] As a result of intensive studies to solve the above problems, the present inventors have found that they have arrived at the following present invention and can solve the problems. That is, the present invention is as follows.

[0008] [1] A mortar composition in which fine powder passing through a sieve with an opening size of 90 μm contains TiO as a chemical component. 2 [2] The mortar composition according to [1], wherein the fine powder contains 0.03% by mass or more of TiO as a chemical component. 2 [3] The content of TiO as a chemical component of the coarse powder remaining without passing through a sieve with an opening size of 90 μm is smaller than the content of TiO as a chemical component of the fine powder. The mortar composition according to [1] or [2]. 2 2 [4] Using a mini slump flow cone conforming to JIS A 1171:2020, the mini slump flow value (measurement temperature: 20°C ± 2°C) measured in accordance with JIS A 1150:2020 "Test Method for Slump Flow of Concrete" is 5 to 30 mm. The mortar composition according to any one of [1] to [3]. [5] The mortar composition according to any one of [1] to [4], wherein the fine powder contains 0.05 to 5% by mass of P 2 O 5 [6] The mortar composition according to any one of [1] to [5], wherein the fine powder contains 10 to 40% by mass of particles having a particle size of 5 μm or less. [7] A repair material containing the mortar composition according to any one of [1] to [6]. [8] A concrete composition containing the mortar composition according to any one of [1] to [6] or the repair material according to [7].

Advantages of the Invention

[0009] According to the present invention, it is possible to provide a mortar composition that can be well thickened during troweling work or the like.

Modes for Carrying Out the Invention

[0010] ​ Hereinafter, an embodiment according to the present invention (hereinafter sometimes 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 this embodiment is a mortar composition in which fine powder passed through a sieve with an opening of 90 μm contains TiO as a chemical component. 2 By the fine powder containing TiO as a chemical component, 2 it becomes possible to impart thixotropy when used for putty work etc., and it becomes possible to apply a good thickness.

[0012] In addition, since the fine powder with a sieve opening of less than 90 μm has a relatively high initial reactivity, when a predetermined amount of TiO is contained in the fine powder, 2 it is presumed that the function of TiO, that is, thixotropy (prevention of sagging) is more likely to be exhibited. 2

[0013] From the viewpoint of more favorably exhibiting thixotropy, the fine powder passed through a sieve with an opening of 90 μm preferably contains 0.03 mass% or more of TiO 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 TiO as a chemical component, a material containing TiO (for example, titanium oxide) may be used as a material. 2 2 2

[0014] In this embodiment, the content of TiO as a chemical component of the coarse powder remaining without passing through a sieve with an opening of 90 μm is preferably smaller than the content of TiO as a chemical component of the fine powder. That is, by the content of TiO as a chemical component of the fine powder being larger than the content of TiO of the coarse powder, 2 2 2 2 in the highly reactive fine powder, 2The function is more likely to be exerted, and it is easier to impart thixotropy, enabling good thickening.

[0015] TiO in the fine powder 2 From the viewpoint of more effectively exerting the function of, the ratio (B / A) of the content (B) of TiO in the fine powder to the content (A) of TiO in the coarse powder is preferably 1.1 to 100, and more preferably 1.5 to 55. 2 content (B) of TiO in the fine powder with respect to the content (A) of TiO in the coarse powder 2 The ratio (B / A) is preferably 1.1 to 100, and more preferably 1.5 to 55.

[0016] The mortar composition according to this embodiment, when made into mortar, uses a mini slump flow cone conforming to JIS A 1171:2020 and is measured in accordance with JIS A 1150:2020 "Test Method for Slump Flow of Concrete" (measurement temperature: 20°C ± 2°C). It is preferably a mortar composition with a mini slump flow value of 5 to 30 mm. Regarding the composition of the above mortar, etc., it is preferably as described in the examples.

[0017] TiO as a chemical component 2 By containing and having a mini slump flow value of 5 to 30 mm, the adhesiveness is improved, and good thickening can be achieved when applying 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 kneading water or the like.

[0019] In the mortar composition according to this embodiment, the fine powder passed through a sieve with an opening of 90 μm preferably contains 0.05 to 5% by mass of P 2 O 5 and more preferably 0.08 to 3% by mass. By setting the content of P 2 O 5 to 0.05 to 5% by mass, it is easy to improve the trowel release when applying with a trowel and can improve the trowel workability.

[0020] P as a chemical component 2 O 5 To contain 0.05 to 5 mass% of P 2 O 5 as a material, a material containing P

[0021] In this embodiment, P as a chemical component of the coarse powder 2 O 5 The content is preferably less than the content of P 2 O 5 as a chemical component of the fine powder. That is, P as a chemical component of the fine powder 2 O 5 The content is greater than the content of P in the coarse powder 2 O 5 By this, the function of P in the highly reactive fine powder is more likely to be exerted, and it becomes easier to impart better spatula release property and enables good spatula workability. 2 O 5

[0022] From the viewpoint of more effectively exerting the function of P in the fine powder 2 O 5 in the fine powder, the ratio (D / C) of the content (D) of P 2 O 5 in the fine powder to the content (C) of P in the coarse powder is preferably 1.1 to 100, and more preferably 2 to 65. 2 O 5

[0023] The fine powder passing through a sieve with an opening of 90 μm preferably contains 10 to 40 mass% of particles with a particle size of 5 μm or less, and more preferably 15 to 35 mass%. By containing 10 to 40 mass% of particles with a particle size of 5 μm or less, thixotropy can be improved and thickening property can be improved.

[0024] In the mortar composition according to this embodiment, the fine powder passing through a sieve with an opening of 90 μm, as a chemical component, in addition to the above-mentioned chemical components, contains CaO, SiO 2 , Al 2 O 3 , Fe 2 O​​3 Preferably, it contains The content of CaO is preferably 10 to 70% by mass, and SiO 2 is preferably 10 to 50% by mass, and Al 2 O 3 is preferably 1 to 20% by mass, and Fe 2 O 3 is preferably 0.1 to 40% by mass.

[0025] The mortar composition according to this embodiment is, for example, a CaO raw material, Al 2 O 3 raw material, Fe 2 O 3 raw material, SiO 2 raw material, and TiO 2 raw material, and, if necessary, P 2 O 5 raw material are mixed, fired to synthesize clinker, pulverized using a ball mill, and then mixed with fine aggregate to be manufactured. 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. Note that as the fine aggregate, commonly used fine aggregate 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, with respect to 100 parts by mass of the cement component obtained by subtracting the fine aggregate from the mortar composition. By the content of the fine aggregate being within the above range, the thick coating property can be enhanced.

[0027] The CaO raw material is, for example, calcium oxide powder, limestone powder, and the Al 2 O 3 raw material is, for example, aluminum oxide powder, bauxite powder, and the Fe 2 O 3 raw material is, for example, iron oxide powder, and the SiO 2 raw material is, for example, silicon dioxide powder, silica powder, and the TiO 2 raw material is, for example, titanium oxide powder, and the P 2 O5 As the raw material, for example, calcium phosphate powder can be used.

[0028] 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 mortar composition.

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

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

[0031] The concrete compositions of this embodiment may be prepared by mixing the respective materials during construction, or some or all of them may be mixed in advance. Also, the mixing method of each material and water is not particularly limited, and each material may be mixed during construction, or some or all of them may be mixed in advance. Further, after mixing a part of the materials with water, the remaining materials may be mixed.

[0032] As the mixing device, any existing device can be used. For example, a tilting drum mixer, an omnimixer, a Henschel mixer, a V-type mixer, a Nauta mixer, etc. can be used.

[0033] The content of the coarse aggregate is preferably 30 to 450 parts by mass, more preferably 50 to 350 parts by mass with respect to 100 parts by mass of the above-described cement component. When the content of the coarse aggregate is within the above range, the durability can be enhanced.

[0034] The amount of water during kneading is not particularly limited as it varies depending on the purpose of use and the content of each material. However, it 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 with respect to 100 parts by mass of the cement component described above. When the kneading water amount is at least the above lower limit value, the fluidity is improved and the workability becomes better. Also, when the kneading water amount is at most the above upper limit value, it becomes easier to ensure strength development.

[0035] The mortar composition or concrete composition according to this embodiment can be suitably used as an underlayer material, a finishing material, a repair material, a joint material, etc. for plastering work, etc., and in particular, it is preferably used as a repair material. In particular, it is preferably a repair material containing the mortar composition of the present invention. At this time, the mortar composition is preferably contained in an amount of 90% by mass or more, and more preferably 100% by mass.

[0036] Examples of the repair target when used as a repair material include portions that have deteriorated, been damaged, or broken in a hardened mortar part or concrete part. As for the repair location, there are those that repair a large area and those that repair a partial small area, and the repair method is selected based on the repair area and the amount of the repair material to be constructed. If the area is relatively large, it is often constructed by a spraying method. On the other hand, when the repair area is small, it is preferably done by troweling. When performing partial cross-section repair, although the area is small, the coating thickness of the repair material is often thick, and a method of applying it in multiple layers is used.

Examples

[0037] (Materials used) CaO raw material: Limestone powder Al 2 O 3 Raw material: Bauxite powder Fe 2 O 3 Raw material: Iron oxide powder SiO 2 Raw material: Silica powder TiO 2 Raw material: Titanium oxide powder P 2 O 5 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] CaO raw material, Al 2 O 3 raw material, Fe 2 O 3 raw material, SiO 2 raw material, and TiO 2 raw material, P 2 O 5 The raw materials, i.e., fine powder and coarse powder, were blended so that the chemical components 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. A mortar composition was prepared by mixing 200 parts by mass of fine aggregate, 45 parts by mass of water, and 0.5 part by mass of water reducing agent with 100 parts by mass of the cement component.

[0039] The prepared mortar composition was sieved with a sieve having an aperture 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. CaO, Al 2 O 3 , Fe 2 O 3 , SiO 2 were measured by X-ray fluorescence diffraction method (XRF). TiO 2 and P 2 O 5 etc. were also measured by X-ray fluorescence diffraction method (XRF). Note that the "other" components in the table are trace components such as SO 3 , MgO, Na 2 O, K 2 O, etc. Also, the content of the fine powder in the mortar composition was 35% by mass.

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

[0041] For this mortar composition, the mini slump flow value 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] For the prepared mortar composition, the following evaluations of sag prevention and trowel release were carried out. The results are shown in Table 1.

[0043] <Sag prevention (adhesion strength)> The adhesion strength (N / mm 2 ) after 7 days of age of the material was measured on a 300×300 mm concrete wall surface (inclined 90°) with a thickness of 40 mm after applying it with a trowel (JSCE-K 561-2013). The adhesion strength is considered qualified if it is 0.3 N / mm 2 or more.

[0044] <Trowel release> When applying with a trowel to a 300×300 mm concrete wall surface (inclined 90°) with a thickness of 40 mm, the mass (g) of the mortar composition adhering to the trowel was measured. This measurement was carried out 10 times and evaluated by the average. The trowel release is considered qualified if it is 20 g or less.

[0045]

Table 1

Industrial applicability

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

Claims

1. The fine powder that passed through a sieve with 90 μm openings contained TiO ２ A mortar composition comprising:

2. The fine powder has TiO as a chemical component. ２ The mortar composition according to claim 1, containing 0.03 mass% or more of

3. 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 is ２ The mortar composition according to claim 1 or 2, wherein the content is less than 1.

0.

4. 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.

5. 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

6. 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.

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

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

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