JP6645825B2 - Mortar for finishing - Google Patents

Description

  The present invention relates to a cement-based finishing mortar used for building walls and the like.

  In recent years, the exterior wall of a detached house is mainly made of a siding which is easy to construct and has excellent durability, and a resin-based finishing agent is often constructed. On the other hand, the cement-based finishing agent is less deteriorated by ultraviolet rays than the resin-based finishing agent, but it is not easy to maintain an aesthetic appearance due to cracks and dirt. For this reason, a paint is usually applied to the surface to impart antifouling properties, but UV degradation occurs. As a measure for improving the durability of cement mortar, a method in which a polymer and a pozzolan substance are mixed and used (for example, see Patent Document 1) and a method in which polymer hollow particles and a powder resin are used in combination (for example, see Patent Document 2) have been proposed. . Further, as a countermeasure against cracking, a method of mixing and using a polymer, an expanding material, a shrinkage reducing agent, and a fiber is also being studied. (See, for example, Patent Document 3) Further, a mixture of a polymer, metakaolin, and a hygroscopic clay mineral which has both improved durability and antifouling measures has been proposed (for example, see Patent Document 4).

JP 2005-187281 A JP 2010-138031 A JP 2005-336952 A JP 2013-095615 A

  However, in the mortars and hydraulic compositions described in Patent Documents 1 to 3, the color of the finish is limited, and the molding properties such as surface shape and pattern and the durability are not sufficiently satisfactory. Further, in the finishing material described in Patent Document 4 which is greatly improved in adhesion durability and formability, the fineness among the formability, antifouling property, whitening, and cracking resistance required for the aesthetic appearance of the finished surface. Sufficient effects have not been confirmed with respect to suppression of cracks and the like. Further, while it is excellent in coloration of white itself, on the other hand, if it is attempted to perform arbitrary coloring on the basis of this, there is a problem that the white color may be overwhelmed and it is difficult to produce a desired color.

  Therefore, the object of the present invention is to improve the aesthetic appearance of the finished surface while having good durability and workability, and in addition to good antifouling properties and versatility in modeling, It is an object of the present invention to provide a cement-based finishing mortar that minimizes the occurrence of cracks on a finished surface, obtains a clear white color, is suitable for coloring, and has excellent color development of a finished color.

  Therefore, the present inventor studied to solve the above problems, and as a result, adopted white cement as the cement, specified the saturation in addition to the lightness of the color tone, and reduced the content of the particle size of less than 600 μm. Using ordinary fine aggregate having the same, using a hygroscopic clay mineral similarly specified color, metakaolin and a specific polymer, if these are blended in a specific ratio, it will give a clear white, but also suitable for coloring The present invention has found that it is possible to increase the degree of freedom of the finished color, and also to significantly increase the resistance to cracking, and to obtain a finishing mortar with good workability in which the finished surface is further improved in appearance. Was completed.

  That is, the present invention provides the following finishing mortars [1] to [6] and colored finishing mortars of [7].

[1] (A) 100 parts by mass of white cement, (B) 39 to 50% by mass when the particle size is 600 μm or more and less than 2500 μm, 23 to 29% by mass when the particle size is 300 μm or more and less than 600 μm, and 25 to 34% by mass when the particle size is less than 300 μm. % Of a Munsell color system having a particle size of 0.5% to 1.0%, 230 to 360 parts by mass of ordinary fine aggregate having a lightness of 8.5 to 9.5, (C) 2 to 4 parts by mass of metakaolin, (D) 0.3 to 2.5 parts by mass of a hygroscopic clay mineral having a saturation of 0.1 to 1.0 and a lightness of 8 to 9.5 of the Munsell color system, and (E) a silane-based water repellent 0.1 to 0.6 parts by mass, and (F) a polymer dispersion and / or re-emulsifying powder resin containing at least one selected from the group consisting of polyacrylate, styrene-butadiene copolymer and ethylene-vinyl acetate copolymer as an active ingredient. Solid fractionation Mortar for finishing containing 2 to 8 parts by mass in total.
[2] The finish of the above-mentioned [1], wherein the content of the fine aggregate other than the (B) ordinary fine aggregate is 5 parts by mass or less based on 100 parts by mass of the (B) ordinary fine aggregate. For mortar.
[3] The finishing mortar according to [1] or [2], further comprising (G) at least one selected from a quicklime-based expanding material and an ettringite-based expanding material.
[4] The finishing mortar according to any one of [1] to [3], further comprising (H) a cellulose-based water retention agent.
[5] The finishing mortar according to any of [1] to [4], further comprising (I) an antifoaming agent.
[6] The finishing mortar according to any one of [1] to [5], which does not contain a lightweight fine aggregate having a closed void.
[7] A finishing mortar obtained by adding a coloring material to the finishing mortar according to any of the above [1] to [6].

  According to the present invention, it is suitable for various molding properties, has good antifouling properties, excellent crack resistance and freedom of coloring, and has excellent durability with an aesthetic appearance having a clear white finished surface that does not inhibit color development. Mortar for finishing is obtained.

The finishing mortar of the present invention contains (A) white cement as a binder phase forming component and a hardening component. By using white cement, whiteness is improved, and coloring other than white is also possible. Commercial products can be used as the white cement. Preferably, a white cement having a lower impurity content has a higher whiteness, and in particular, a cement in which the Fe ₂ O ₃ content is adjusted to about 0.2% or less is preferable. Specifically, “White Cement” manufactured by Sanyo White Cement Co., Ltd. is exemplified.

  The content of the components of the finishing mortar of the present invention described below is a value based on 100 parts by mass of the content of the white cement in the finishing mortar, unless otherwise specified.

  The (B) ordinary fine aggregate used in the present invention has a particle diameter of from 600 μm to less than 2500 μm, 39 to 50% by mass, a particle diameter of 300 μm to less than 600 μm, 23 to 29% by mass, and a particle diameter of less than 300 μm, 25 to 34% by mass. It consists of the granularity of. By setting the particle size distribution of ordinary fine aggregate in this range, particularly by reducing the content of those having a particle size of 300 μm or more and less than 600 μm and those having a particle size of less than 300 μm, the workability is good and the variety of finished patterns is good. And crack resistance can be improved.

If the particle diameter is at least 600 μm and less than 2500 μm exceeds 50% by mass, the finishing method in terms of the construction method and the molding surface will be limited, and a finished material having excellent versatility in the finishing pattern cannot be obtained. If the particle diameter is 600 μm or more and less than 2500 μm is less than 39% by mass, the water-cement ratio becomes large, an appropriate construction thickness cannot be obtained, and the finished pattern becomes poor in design. Further, with an increase in the water-cement ratio, drying shrinkage also increases, which may cause cracking. When the particle diameter is 600 μm or more and less than 2500 μm, 42 to 50% by mass is preferable, and 43 to 50% by mass is more preferable.
When the particle diameter of less than 300 μm exceeds 34% by mass, the ratio of ordinary fine aggregate in another particle diameter range is reduced, so that it is difficult to obtain an appropriate construction thickness and the finished pattern is limited. , The drying shrinkage increases, and cracks may occur. If the particle size of less than 300 μm is less than 25% by mass, the amount of relatively coarse ordinary fine aggregate increases, so that the compactness is reduced and the durability is likely to be reduced, and the finished pattern may be roughened. When the particle size is less than 300 μm, it is preferably 25 to 33% by mass, more preferably 25 to 30% by mass.
Further, when the particle diameter of 300 μm or more and less than 600 μm exceeds 29% by mass, the ratio of ordinary fine aggregate in another particle size range is reduced, so that the finished pattern is limited, and versatility in modeling cannot be obtained, and Is low. If the particle diameter is at least 300 μm and less than 600 μm is less than 23% by mass, unevenness is likely to occur on the finished surface, and iron workability and formability are likely to be undesirably increased. When the particle diameter is 300 μm or more and less than 600 μm, the content is preferably from 24 to 29% by mass, more preferably from 24 to 28% by mass.

The (B) ordinary fine aggregate used in the present invention has a Munsell color system having a saturation of 0.5 to 1.0 and a lightness of 8.5 to 9.5 in addition to the above-mentioned particle size configuration. If the saturation of the Munsell color system is less than 0.5, it is not preferable because a desired color may not easily appear during coloring. On the other hand, if the chroma exceeds 1.0, the fine aggregate is conspicuous due to the color difference from the white cement, and a finished surface of uniform color cannot be obtained, which is not preferable. The saturation is more preferably from 0.5 to 9.0.
On the other hand, if the lightness of the Munsell color system is less than 8.5, the fine aggregate is usually conspicuous in the mortar due to the difference in color tone from the white cement, and it is difficult to obtain a finished surface having a uniform color tone, which is not preferable. Further, if the brightness exceeds 9.5, it exceeds the description limit of the color sample book of the Munsell color system, which is not preferable. The lightness is preferably 8.6 to 9.3.

  In addition, since the ordinary fine aggregate having the saturation and lightness of the Munsell color system as described above is easily obtained, and furthermore, a durable construction can be obtained, the ordinary aggregate may be limestone. Preferably, more preferably, hydrated stone (white limestone) is used, but the ordinary aggregate is not limited to limestone aggregate.

  The finishing mortar of the present invention can also contain ordinary fine aggregates other than the ordinary fine aggregate (B) having the color tone and the particle size configuration of the Munsell color system as described above, but the color development and the crack resistance Therefore, the content is preferably 5 parts by mass or less (including 0 parts by mass) based on 100 parts by mass of the (B) ordinary fine aggregate, and more preferably 3 parts by mass. The content is more preferably not more than 0 parts by mass (including 0 parts by mass). In addition, aggregates other than ordinary fine aggregates, for example, lightweight aggregates, especially foamed lightweight aggregates such as pearlite, glass hollow particles, lightweight fine aggregates that are lightweight by including closed voids such as resin hollow particles Use is easy to break at the time of construction, it is difficult to form a fine finished surface pattern, and it is a construction with low strength expression and poor durability, so the fine aggregate of the finishing mortar of the present invention Desirably does not contain such lightweight aggregate.

  The content of the (B) ordinary fine aggregate in the finishing mortar of the present invention is 230 to 360 parts by mass, preferably 260 to 300 parts by mass, based on 100 parts by mass of the (A) white cement. If the content of the (B) ordinary fine aggregate is less than 230 parts by mass, the ratio of the amount of white cement becomes too large, the viscosity increases, and the workability is reduced. For this reason, a good finished pattern cannot be obtained, and a proper construction thickness cannot be obtained. In addition, the water-cement ratio increases, and drying shrinkage increases, which may cause cracking. On the other hand, if the content exceeds 360 parts by mass, the workability of the iron decreases. In addition, since the content ratio of the white cement is reduced, the contour of the finished pattern becomes unclear, resulting in deterioration of the formability.

  The finishing mortar of the present invention contains (C) metakaolin. In the present invention, metakaolin contributes to increasing the compactness, gives a tightness to the mortar after construction, and can improve the workability and durability. Metakaolin has higher whiteness than other pozzolan-reactive substances, and can achieve high density without inhibiting the finish color. When other pozzolan-reactive substances are used, the finish color tends to be inhibited.

(C) Metakaolin having a lower impurity content is more suitable for use because it has higher whiteness, and more preferably has an effect of improving iron workability. Therefore, use of fine powder having a specific surface area of 10,000 cm ² / g or more is more preferable. good. The content of metakaolin in the finishing mortar of the present invention is 2 to 4 parts by mass with respect to (A) the white cement mass part. If the content of metakaolin is less than 2 parts by mass, it may not be possible to obtain a high density, and if the content exceeds 4 parts by mass, it is necessary to increase the amount of water required for the reaction, and the water-cement ratio increases to increase the strength. It is not preferable because it causes a decrease. A more preferred content of kaolin is 2.2 to 3.8 parts by mass.

The finishing mortar of the present invention contains (D) a hygroscopic clay mineral. The hygroscopic clay mineral is a clay mineral that can absorb water, and has a good fluidity and a function of improving adhesion at the time of construction by containing water, and greatly contributes to improvement of workability. Such viscous minerals include sepiolite, bentonite, zeolite and attapulgite. In addition, the hygroscopic clay mineral to be contained is required to have a saturation of 0.5 to 1.0 and a lightness of 8.5 to 9.5 of the Munsell color system. If the saturation of the Munsell color system is less than 0.5, the saturation is too low and pure white is difficult to obtain, which is not preferable. If the saturation exceeds 1.0, the color difference from the white cement is too wide, and the moisture absorption is contained. It is not preferable because the clayey mineral may be seen as a color spot.
On the other hand, if the lightness of the Munsell color system is less than 8.5, the color difference from the white cement is increased, and the fine aggregate is usually conspicuous in the mortar, making it difficult to obtain a finished surface having a uniform color tone, which is not preferable. The brightness 9.5 is a substantial upper limit of the Munsell color system itself.
By adopting such a value of the Munsell color system, while contributing to providing a clear white color, it is possible to suppress the inhibition of desired color development when performing coloring. As long as it is a hygroscopic clay mineral corresponding to the value of the Munsell color system, the chemical composition and composition are not particularly limited, and any of them can be used. The preferred chroma of the hygroscopic clay mineral is 0.6 to 0.9, and the lightness is 8.5 to 9.3.

  The content of (D) the hygroscopic clay mineral in the finishing mortar of the present invention is 0.3 to 2.5 parts by mass based on 100 parts by mass of (A) white cement. If the content of the hygroscopic clay mineral is less than 0.3 parts by mass, the effect of improving workability with respect to iron workability or the like may not be obtained, and therefore, if the content exceeds 2.5 parts by mass, the viscosity increases and the kneading property increases. If the amount of water is increased to solve this problem, the strength tends to decrease and cracks tend to occur, which is not preferable. (D) The preferable content of the hygroscopic clay mineral is 0.5 to 2.5 parts by mass, more preferably 0.5 to 2.0 parts by mass.

  The finishing mortar of the present invention contains (E) a silane-based water repellent. The silane-based water repellent is useful for imparting antifouling properties, frost resistance, and salt resistance to the finishing mortar. As the silane-based water repellent used in the present invention, a silane compound which becomes a reactive silanol under highly alkaline conditions when mixed with cement mortar is preferable. For example, organic silane, polysilane, and the like. The surface of the reactive silanol is modified to be hydrophobic by crosslinking between silanol groups or reaction with an inorganic compound. Therefore, the silane-based water repellent has good kneading properties, and the finishing mortar of the present invention exhibits excellent water repellency after curing.

  The content of the (E) silane-based water repellent in the finishing mortar of the present invention is 0.1 to 0.6 parts by mass based on 100 parts by mass of the (A) white cement. If the content of the silane-based water repellent is less than 0.1 part by mass, appropriate water repellency cannot be obtained, and there is no content effect, which is not preferable. However, the amount of expensive silane-based water repellent used only increases, which is uneconomical and not preferable. (E) The preferable content of the silane-based water repellent is 0.2 to 0.6 parts by mass, and more preferably 0.2 to 0.5 parts by mass.

  The finishing mortar of the present invention comprises (F) a polymer dispersion containing as an active ingredient at least one selected from the group consisting of polyacrylate, styrene butadiene copolymer (SBR) and ethylene vinyl acetate copolymer (EVA). Or it contains a re-emulsified powder resin. By using such a polymer dispersion or re-emulsifying type powder resin in combination with a silane-based water repellent or metakaolin, it contributes to the reduction of cracks in the finishing mortar and the improvement of adhesion to the substrate, and the ability to follow the deformation of the substrate. It also contributes to the improvement of durability such as salt damage resistance and neutralization prevention.

  In the finishing mortar of the present invention, (F) a polymer dispersion and / or a re-emulsified powder resin containing at least one selected from the group consisting of polyacrylate, styrene-butadiene copolymer and ethylene-vinyl acetate copolymer as an active ingredient. The content is 2 to 8 parts by mass in terms of solid content based on 100 parts by mass of the white cement (A). When the content is less than 2 parts by mass, the content effect is hardly obtained, so that it is not preferable. When the content is more than 8 parts by mass, the viscosity is too high and the workability is deteriorated.

  It is preferable that the finishing mortar of the present invention further comprises (G) at least one selected from quicklime-based expanding materials and ettringite-based expanding materials in addition to the components (A) to (F). By including the quicklime-based expanding material and / or the ettringite-based expanding material, shrinkage in the initial stage of hardening can be suppressed, which contributes to prevention of crack generation and dimensional stability. In addition, the combined use of the water repellent (E) or the polymer dispersion (F) and / or the re-emulsifying type powder resin has an effect of preventing water dispersion and unnecessary moisture absorption, and thus has a long term crack resistance. Will be sustainable. The quicklime-based expansive material contains quicklime as an active ingredient, and its hydration reaction causes volume expansion due to the generation of calcium hydroxide. The ettringite-based expanding material contains calcium sulfoaluminate as an active ingredient, and expands in volume by forming ettringite by a hydration reaction. It is not necessary to use a particularly limited one of these expanders, and for example, any commercially available product can be used, or both can be used in combination.

  In the finishing mortar of the present invention, the content of the (G) quicklime-based expanding material and / or the ettringite-based expanding material is preferably 2 to 6 parts by mass with respect to (A) 100 parts by mass of the white cement. More preferably, it is 3.3 to 5.5 parts by mass. By setting the content of the quicklime-based expanding material and / or the ettringite-based expanding material to 2 to 6 parts by mass, the effects related to the contribution of the expanding material can be sufficiently exhibited.

  Further, the finishing mortar of the present invention preferably further contains (H) a cellulose-based water retention agent. As the cellulosic water retention agent, any substance can be used as long as it contains a cellulose derivative as an active ingredient and is water-soluble at room temperature. Specific examples include methylcellulose, carboxymethylcellulose, hydroxypropylmethylcellulose, hydroxyethylcellulose, hydroxyethylmethylcellulose, hydroxypropylcellulose, cellulose sulfate and the like. Among these, a water retention agent containing methylcellulose, hydroxypropylmethylcellulose or hydroxyethylmethylcellulose as an active ingredient is more preferable. By containing a cellulose-based water retention agent, it is possible to obtain workability, particularly a finishing mortar suitable for plastering, and to contribute to suppression of rapid drying in the initial stage of work and improvement of curability.

  The content of the (H) cellulose-based water retention agent in the finishing mortar of the present invention is preferably 0.1 to 0.25 parts by mass based on 100 parts by mass of the (A) white cement. By setting the content of the cellulosic water retaining agent to 0.1 to 0.25 parts by mass, the above-mentioned effects of the cellulosic water retaining agent can be sufficiently exhibited.

  The finishing mortar of the present invention preferably further contains (I) an antifoaming agent. As the defoaming agent, any of a polyether type and a silicone type can be used, and for example, a commercially available product for mortar and concrete can be used. The inclusion of an antifoaming agent significantly reduces the residual air bubbles that are trapped during kneading, and can suppress a decrease in strength and denseness. In addition, it can prevent the occurrence of foam break marks after construction, contributing to improved aesthetics. .

The content of (I) the antifoaming agent in the finishing mortar of the present invention is preferably 0.08 to 0.15 parts by mass based on 100 parts by mass of (A) white cement. By setting the content of the water retention agent containing a cellulose derivative as an active ingredient to 0.08 to 0.15 parts by mass, the above-described effect of the antifoaming agent can be sufficiently exhibited.

  The finishing mortar of the present invention can contain components other than the above (A) to (I) as long as the effects of the present invention are not substantially lost. Such components include, for example, drying shrinkage reducing agents, water reducing agents (dispersing agents, high performance water reducing agents, high performance AE water reducing agents, fluidizing agents, etc.) which can be used in mortar or concrete. And a setting regulator.

  When a coloring agent (material) is added to the finishing mortar of the present invention for coloring other than white to make a coloring mortar for finishing, the desired coloring agent (material) is added to the finishing mortar. Add by percentage. The amount added at this time may be appropriately determined according to the colorant (material), the desired color tone, and the like. When the standard of the addition amount is illustrated, the addition amount may be approximately 15 parts by mass or less, preferably 0.5 to 15 parts by mass with respect to 100 parts by mass of the finishing mortar containing other components except for the kneading water. . If the amount of addition is greater than this, in many cases, a change in color tone with an increase in the amount of addition tends to be difficult to perceive. Further excessive addition in large amounts may impair good durability and workability. The colorant (material) that can be added is not particularly limited as long as it does not substantially cause a chemical reaction with other contained components, and examples thereof include mortar pigments and colored ore particles. In addition, coloring can be performed in a case where the entire finished surface is uniformly colored without unevenness, and in a case where the colored particles dispersed near the surface of the finished surface are colored. In the latter case, the color tone (background color) of the finished surface in the portion where the dispersed colored particles do not appear is usually white.

  The finishing mortar of the present invention can be constructed by using a mixer such as a mortar mixer, for example, adding water to each of the above components, kneading the mixture, and applying the mixture to an outer wall or the like. The amount of the kneading water in the finishing mortar of the present invention is not particularly limited, and may be appropriately set according to the composition, the construction means, and the like. As an example, when showing the standard when performing plastering using a gold iron or a wooden iron, as an amount of kneading water with respect to 100 parts by mass of the white cement content in the finishing mortar, 16 to 18 parts by mass may be mentioned. As a guideline for performing spraying using a spraying device, 17 to 19 parts by mass can be mentioned. It is not limited to these amounts.

  Examples of construction objects of the finishing mortar of the present invention include detached houses, apartment houses, outer walls of public buildings, artificial trees, artificial stones, and the like. As a construction means, a trowel construction, a roller construction or the like is preferable, but a spray construction can also be performed. As a finishing means in modeling, for example, a scraping finish, a plaster finish, a wood trowel finish, or the like can be performed. Also, various patterns such as combs and sculptures can be applied to the finished surface.

  Next, the present invention will be described in more detail with reference to examples. Note that the present invention is not limited to these examples.

[Preparation of finishing mortar]
The fabrication was performed at a temperature of 20 (± 1) ° C. unless otherwise specified.
Using the material and water shown in Table 1, using a Hobart mixer or a hand mixer so as to have the composition shown in Table 3-1 to Table 3-3, kneading for about 1 minute and finishing mortar in a fresh state ( Inventive products 1 to 29 and reference products 31 to 43) were produced. Here, among the materials shown in Table 1, the granularity of ordinary fine aggregate is shown in Table 2 in detail. For a part of the materials used, the hue, lightness and saturation of the Munsell color system were determined from the L value, a value and b value per 1 cm ² measured with a color difference meter (manufactured by Nippon Denshoku Industries). The results are shown in Table 1. Further, among the ordinary fine aggregates mixed in the finishing mortar, the particle size configuration of only ordinary fine aggregates corresponding to the brightness 8.5 to 9.5 and the saturation 0.5 to 1.0 of the Munsell color system Table 4-1 to Table 4-3 show the mass ratio of the color tone in the ordinary fine aggregate).

[Fresh properties of finishing mortar]
The following properties of the prepared fresh finishing mortar were measured. Each measurement result is shown collectively in Table 5-1 and Table 5-2. The measurement of the basic properties was performed at a temperature of 20 (± 1) ° C.

(1) Flow value of mortar The measuring method was performed according to JIS R5201. This measurement was performed within approximately 30 seconds after the preparation of each finishing mortar.

(2) Unit Volume Mass The measuring method was a method using a stainless steel cylindrical container with an inner volume of 500 mL and conforming to JIS A 1171.

  From the results of Tables 5-1 and 5-2, the mortar for finishing of the product of the present invention generally has a mortar flow value (160 to 190 mm at 20 ° C.) which is considered to be suitable for both plastering and spraying. It can be seen that it is within the range.

[Test on formability and workability of finishing mortar]
The prepared finishing mortar was placed on a 450 × 600 × 60 mm concrete plate placed vertically on the ground with one of the 60 × 450 mm surfaces as the bottom surface. The method was applied and applied, and the workability and formability were examined. The construction was performed at a temperature of 20 (± 1) ° C.

(1) Test of Iron Workability and Formability by Iron Work A 7 mm comb iron was used as a gold iron, and the finishing mortar was applied to a concrete wall surface with a thickness of about 5 mm. If there was no dripping or dropping of the applied material and there was substantially no adhesion of the finishing mortar on the coated iron iron, it was judged that the iron workability was "good". The sex was determined to be "poor".
In addition, if a clear comb pattern could be formed on the construction by one iron coating, the formability by ironing was judged to be “good”, and if not, the formability was judged to be “poor”. did. Table 6 shows the above results.

(2) Molding property test of scraping with a trowel After applying the finishing mortar to a concrete wall with a gold trowel to a thickness of about 5 mm with a gold trowel, and after elapse of 180 minutes or more, the irregularities on the surface of the applied material were scraped. I scraped it off with a trowel. Such scraping can be carried out by a manual iron trowel, and a substantially uniform goosebump-like projection pattern can be formed on the surface of the scraped application object, and the formability is determined to be "good". A pattern that was not formed or lacked clarity was judged to have poor formability. Table 6 shows the above results.

(3) Test of the formability of the plaster finish with a trowel After applying the finishing mortar on a concrete wall with a gold trowel to a thickness of about 5 mm using a gold trowel, the applied material on the concrete wall is pressed against the wall with a gold trowel and leveled against the wall. The gold trowel was pulled away from the coated material as it was. If the applied material was not peeled off from the wall surface and the stucco-like pattern was formed on the surface of the applied material, the formability was judged to be "good". It was judged. Table 6 shows the above results.

(4) Test of sprayability and formability by spraying A commercially available lysing gun was used as a spraying device, and the finishing mortar was sprayed on a concrete wall surface. A coating material having a thickness of about 5 mm can be formed, no dripping or falling of the coating material, and no obstruction was observed in the injection port of the used lysing gun, and the spraying workability was determined to be "good". Those which did not reach such a situation were judged as spraying workability "poor".
In addition, when a clear lysine pattern was formed on the surface of the applied material sprayed on the concrete wall, the formability by spraying was judged to be "good", and such a lysine pattern could not be obtained, or In both cases, a pattern lacking clarity was judged to have poor formability. The above results are shown in Table 6-1 and Table 6-2.

  From the results of Table 6-1 and Table 6-2, it is understood that the finishing mortar of the product of the present invention is suitable for various moldability.

[Test of physical properties related to durability of finishing mortar]
The following physical properties related to durability were examined for the finishing mortar prepared above. In addition, the test and measurement for grasping the properties were performed at a temperature of 20 (± 1) ° C. unless otherwise specified. These results are summarized in Table 7.

(1) Evaluation test of shape and dimension stability A length change rate at a material age of 28 days was measured by a method based on JIS A 1171. If the rate of change in length is less than 0.1%, it is easy to maintain the state of adhesion to the construction symmetrical material, so that peeling or interface cracking is unlikely to occur over a long period of time, and in this regard, the durability is considered to be “good”. Is determined.

(2) Test of water absorption The water absorption for 24 hours was measured by a method based on JIS A 1171. Those having a high water absorption increase the possibility of cracking due to drying shrinkage.

(3) Evaluation test for freeze-thaw resistance A mortar for finishing was filled in a mold having an inner size of 100 × 100 × 400 mm, and the mold was removed after 48 hours. Next, after curing the obtained molded hardened body for 4 weeks, it was immersed in water at 20 ° C. for 24 hours to obtain a test body. The test specimen was subjected to a freeze-thaw test by 300 cycles at a time in accordance with the method A specified in JIS A 1148, and the relative dynamic elastic modulus (%) at 300 freeze-thaw cycles was determined. When the relative kinematic elasticity coefficient is 85% or more, the building has sufficient frost damage resistance, and thus the durability is judged to be "good" in this regard.

(4) Compressive strength and bending strength test A mortar for finishing was filled into a mold having an inner size of 40 × 40 × 160 mm, and was demolded after 48 hours. The obtained cured molded body was cured in the air, and a specimen having a material age of 28 days was used as a specimen, and the uniaxial compressive strength and bending strength were measured by a method in accordance with JIS A 6916.

  From the results of Tables 7-1 and 7-2, it is understood that the finishing mortar of the present invention is excellent in crack resistance and durability. On the other hand, the reference mortars other than the present invention were inferior in such properties.

[Evaluation of properties related to aesthetic appearance of finishing mortar]
The following tests were performed on the prepared finishing mortar, and properties related to aesthetic appearance were examined.

(1) Evaluation test for antifouling property Two 150 × 300 × 3 mm flexible plates were placed on the prepared mortar for finishing using a gold iron so that the 150 × 300 mm surface was horizontal to the ground. Was applied so as to have a thickness of about 5 mm. After curing in an indoor atmosphere at 20 (± 1) ° C. for 3 weeks, one of the flexible plates was coated with an epoxy resin on the remaining five surfaces to which the finishing mortar had not been applied. It was placed vertically on an outdoor ground with one side of 150 × 3 mm as the bottom so that the surface on which the coating material was formed faced south, and an exposure test was conducted at an average temperature of 23 ° C. for 90 days. The flexible board not subjected to the exposure test was placed in a dust prevention case and stored as it was indoors at 20 ° C. (± 1 ° C.) for 90 days. The coated surface of the flexible plate after the end of the exposure test and the coated surface of the flexible plate that had been stored in the case until the same time were measured with a color difference meter (commercially available), and the color difference (Δ * _ab ) between the two was measured. I asked. When the color difference (Δ * _ab ) is less than 2.0, it is difficult to confirm a clear color difference with the naked eye, so that there is no noticeable stain on the exposed body and the antifouling property is judged to be “good”. You. When the color difference (Δ * _ab ) is 2.0 or more, it becomes possible to distinguish the color difference between the applied materials of both flexible boards with the naked eye, so that the possibility of contaminant adherence during exposure increases, and the antifouling property becomes “poor”. It was judged. The results are shown in Tables 8-1 and 8-2.

(2) Evaluation of crack resistance In the antifouling evaluation test described above, cracks were generated on the surface of the coated material of the flexible plate after the exposure test and the surface of the coated material of the flexible plate stored in the case until the same time. Was examined. Visual observation using a 5 × magnifier was used to judge that no cracks, including fine cracks, were found at all. Bad. " The results are also shown in Table 8.

(3) Evaluation of color tone after application of finishing mortar In the above-mentioned evaluation test of antifouling properties, coating at the time when the flexible board after applying the finishing mortar was cured in an indoor air at 20 (± 1) ° C for 3 weeks. Using the Munsell Color System Color Swatch Book, the hue, lightness and saturation of the Munsell Color System were examined. The results are also shown in Tables 8-1 and 8-2.

(4) Preparation and evaluation of colored mortar for finish For some of the finish mortars of the formulations shown in Tables 3-1 to 3-3 and Tables 4-1 to 4-3, water was removed during the preparation. Mortar pigment (manufactured by Ozeki Co., Ltd.) or 2% by mass (Example) in an amount corresponding to 10% by mass (Example 1-6, Comparative Example 1-4) of the total amount of the materials used for the blending. 7) Colored synthetic ore particles shown in Table 9 in an amount corresponding to 10% by mass (Example 8) and 15% by mass (Example 9) (melted and granulated inorganic ceramic pigments for ceramics. 1.2 mm) was added and kneaded, and a colored coloring mortar for finishing was prepared. This mortar was applied to the upper surface of a 150 × 300 × 3 mm flexible plate placed so that the 150 × 300 mm surface was horizontal to the ground with a gold trowel so as to have a thickness of about 5 mm. The color of the surface of the coated material after curing for 3 weeks in an indoor atmosphere at 20 (± 1) ° C. was measured for L value, a value and b value per 1 cm ² with a color difference meter (manufactured by Nippon Denshoku Industries Co., Ltd.). To the hue, lightness and saturation of the Munsell color system. The results are shown in Table 9. In Examples 7 and 8, the finished surface had fine blue spots on a white background. However, the hue, lightness, and saturation of the Munsell color system were L values by a color difference meter for a surface of about 1 cm ² , a The value and b value were determined from the measured values. Therefore, the measurement using the color difference meter was not performed for the respective color tones of the white portion and the blue portion. As long as the color tone of the fine spots that have developed blue is visually observed using the Munsell Color System color sample book, the color tone of the colored ore grains before mixing is substantially the same as the Munsell value tone (both lightness and chroma are single). From within ± 0.2).

From the results of Tables 8-1 and 8-2, the finishing mortar of the product of the present invention was visually observed, even after exposure for at least 90 days, compared to that stored in an antifouling case without exposure. Since there is no color difference that can be easily identified, it is difficult to attach dirt, and it is considered that the attached dirt is easily removed naturally by rainwater. In addition, it can be seen that the finishing mortar of the product of the present invention has no fine cracks even after long-term exposure, and can maintain the surface appearance at the time of application without any deterioration.
In addition, the finishing mortar of the present invention can normally exhibit a clear white color stably. However, from the results in Table 9, when a coloring substance such as a pigment is added, the color more faithful to the color of the coloring substance is obtained. Is obtained, which indicates that the mortar is suitable as a substrate for finishing to a desired color tone.

Claims (7)

  (A) 100 parts by mass of white cement, (B) particle size of 39-50% by mass when the particle size is 600 μm or more and less than 2500 μm, 23-29% by mass when the particle size is 300 μm or more and less than 600 μm, and 25-34% by mass when the particle size is less than 300 μm. 230 to 360 parts by mass of ordinary fine aggregate having a saturation of 0.5 to 1.0 and a lightness of 8.5 to 9.5, (C) 2 to 4 parts by mass of metakaolin, (D) 0.3 to 2.5 parts by mass of a hygroscopic clay mineral having a saturation of 0.1 to 1.0 and a lightness of 8 to 9.5 of the Munsell color system, and (E) a silane-based water repellent 0.1 to 0.6. Parts by weight, and (F) a polymer dispersion and / or re-emulsified powder resin containing at least one selected from the group consisting of polyacrylates, styrene-butadiene copolymers, and ethylene-vinyl acetate copolymers as active ingredients, in terms of solid content. 2 Mortar for finishing containing ８8 parts by mass.   The finishing mortar according to claim 1, wherein the content of the fine aggregate other than the (B) ordinary fine aggregate is 5 parts by mass or less based on 100 parts by mass of the (B) ordinary fine aggregate.   The finishing mortar according to claim 1 or 2, further comprising (G) at least one member selected from quicklime-based expanding material and ettringite-based expanding material.   The finishing mortar according to any one of claims 1 to 3, further comprising (H) a cellulose water retention agent.   The finishing mortar according to any one of claims 1 to 4, further comprising (I) an antifoaming agent.   The finishing mortar according to any one of claims 1 to 5, which does not contain a lightweight fine aggregate having a closed void.   A coloring mortar for finishing obtained by adding a coloring material to the finishing mortar according to any one of claims 1 to 6.