JP2013023429A - Mortar composition having unevenness adjusting function and surface finishing function accompanied by fine appearance, and construction method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mortar composition and a construction method therefor capable of performing unevenness adjustment of 2-25 mm of a concrete structure formwork surface placed by using a formwork, and surface finishing which is strong against efflorescence, neutralization and shrinkage crack and which has fine appearance performance, efficiently at one time with excellent work efficiency by an application process by using a trowel or a spatula.SOLUTION: A mortar composition material is used, which comprises cement, a resin, titanium oxide, an expansive additive, a higher fatty acid, a fine aggregate, an inorganic pigment and water as main components for the composition, and which is formed by adding the fine aggregate, the inorganic pigment and water to a mixture obtained by adding a 2-8 pts. wt acrylic re-emulsified powder resin, 3-20 pts. wt titanium oxide, a 2-10 pts. wt expansive additive, and a 0.1-3 pts. wt higher fatty acid to 100 pts. wt cement. In the construction method, the mortar composition is applied by using a trowel or a spatula.

Description

  TECHNICAL FIELD The present invention relates to a material capable of performing surface finishing with unevenness adjustment and aesthetics of a concrete structure surface placed using a formwork at once, and a method for the same.

  In the construction of a concrete structure, there are many methods in which a steel, wooden, or resin mold is used to frame and concrete is placed therein.

  When the predetermined curing is completed after the concrete is placed and the self-supporting strength is ensured, an operation of removing the mold is performed.

  It is common for the surface of a demolded concrete structure to have a formwork pattern, irregularities, joints, bubbles, jumpers, and toro leaks depending on the type of concrete, the placement method, and seasonal conditions. .

  Therefore, if the surface of the demolded concrete structure is left as it is, the structure will become defective and the dimensions will be poor.In addition, due to the deterioration of the concrete over time, white surface, neutralization, shrinkage cracks will progress from the surface and the appearance will be poor. Become.

  As a method for coping with such a problem, an uneven mortar has been developed to correct structural defects and dimensional defects. (For example, see Patent Document 1)

  Furthermore, a mortar having a non-land surface adjustment function of 5 mm or less has been developed for the purpose of protecting the surface of concrete from whiteness, neutralization, and shrinkage cracking by utilizing resin performance. (See, for example, Patent Document 2, Patent Document 3, and Patent Document 4)

JP 2001-39755 A JP 2002-80254 A JP 2008-37717 A JP 2004-225375 A

  However, the uneven mortar for correcting dimension defects of 5mm or more has no surface finish function with aesthetics, and finally it is made of acrylic, urethane, silicon, fluorine-based paints with high weather resistance. It becomes a method of coating with a material, and it involves two steps, ie, a mortar material trowel or spatula and a paint-based material brush or roller coating.

  In addition, mortar materials that have surface finish functions with aesthetics that protect the underlying concrete while also adjusting for unevenness, only use resin performance, depend on the amount of resin added, and from the surface due to deterioration over time. In order to improve the performance against white flower, neutralization and shrinkage cracking, the only way to increase the resin content is to increase the viscosity of the material, causing it to stick to the iron and spatula, resulting in poor workability and thinning. There was a problem that it was not possible to correct a step of 5 mm or more at a time.

  The present invention provides 2 mm to 25 mm uneven adjustment and surface finish of concrete structure formwork placed using a formwork, which is resistant to whiteness, neutralization, shrinkage cracking, and has aesthetic performance. A good mortar composition material is used, and it is applied by the application method using a trowel or spatula at once.

  As a result of diligent development, the inventors of the present invention have good workability with a method of applying a mortar material using a trowel or a spatula and can be thickly coated with a thickness of 5 mm or more at a time. To make the mortar material excellent in neutralization and shrinkage cracking performance, the range of the amount of acrylic re-milk powder resin is limited, and appropriate amounts of titanium oxide, expansion material and higher fatty acid are added, fine aggregate, inorganic The present invention has been completed by finding that good results can be obtained by using a mortar composition material adjusted with pigment and water.

  The mortar composition material is 2 to 8 parts by weight of acrylic re-emulsified powder resin, 3 to 20 parts by weight of titanium oxide, 2 to 10 parts by weight of an expanding material, and 0.1 to 3 parts by weight of higher fatty acid with respect to 100 parts by weight of cement. The material added in the range of part is adjusted with fine aggregate, inorganic pigment and water.

  By using the mortar composition material of the present invention, it is resistant to unevenness adjustment and white flower, neutralization, shrinkage cracking, and aesthetics of a concrete structure formwork surface placed using a formwork. Surface finish with performance can be performed once by a method of applying using a trowel or spatula, and the conventional method of using a relatively large area with general aesthetics, white flower, neutralization, shrinkage cracking performance Applying using a mortar for adjusting the surface that does not take into account, and then using a two-step construction procedure, such as finishing with a brush or roller with materials of acrylic, urethane, silicon, fluorine-based paints with high weather resistance performance The mortar composition of the present invention compared to a construction method that uses an elastic mortar material with high viscosity utilizing resin performance and ensures a thickness by repeating a thin coating process of 5 mm or less many times. The construction method using materials reduces work processes and material application tools, which means that work can be done efficiently and rationally. When constructing external walls that are easily affected by weather conditions such as rainfall, etc. In particular, reducing man-hours is particularly effective.

  The mortar composition having the surface finish function with the unevenness adjusting function and the aesthetics of the present invention is 2 to 8 parts by weight of acrylic re-emulsified powder resin, 3 to 20 parts by weight of titanium oxide, with respect to 100 parts by weight of cement. A material added in the range of 2 to 10 parts by weight of an expanding material and 0.1 to 3 parts by weight of a higher fatty acid is adjusted with fine aggregates, inorganic pigments and water.

  The cement used in the present invention is not particularly limited as long as it is a general cement conventionally used in civil engineering and construction. For example, Portland cement, white cement, blast furnace cement, rapid hardening cement, fly ash cement, etc. These may be used in combination, but it is preferable in terms of cost to use Portland cement or white cement.

  The acrylic re-emulsified powder resin used in the present invention is not particularly limited as long as it is conventionally added to cement as a resin mortar and used in a premix cement material, but is defined in JIS A 6203. It is reliable to use a re-emulsified powder resin for cement admixture with a certain quality.

  The titanium oxide used in the present invention is not particularly limited as long as it is conventionally used as a pigment for imparting white color to mortar or concrete.

  The expansion material used in the present invention is not particularly limited as long as it is composed of at least one of lime-based and calcium sulfoaluminate-based materials that are conventionally added to mortar and concrete.

  The higher fatty acid used in the present invention is not particularly limited as long as it is stearic acid, but it is preferable to use one or more of calcium stearate, zinc stearate, and magnesium stearate.

  Aggregates and inorganic pigments used for adjustment in the present invention are not particularly limited as long as they are conventionally used in mortar and concrete, but regarding aggregates, river sand and silica sand are versatile and readily available. It is preferable to use a mixture of lightweight aggregates such as calcium carbonate and pearlite. Moreover, iron oxide etc. are mentioned as an inorganic pigment.

  In addition, the mortar composition having the surface finish function with the unevenness adjusting function and the aesthetics of the present invention is, for example, an antifoaming agent, a thickener, Materials, water reducing agents, curing accelerators, curing retarders, inorganic fibers, organic fibers, organic pigments, antiseptics, antibacterial agents, water repellents, EVA re-emulsified powder resins, and the like may be mixed.

  In addition, the construction method that can effectively implement the mortar composition having the surface finish function with the unevenness adjustment function and the aesthetics of the present invention is a construction method using a trowel or a spatula. As long as the action of the invention is not hindered, it is preferable to perform primer treatment and water hammering treatment on the concrete base. Moreover, as a preparation process, it is preferable to remove the mold release agent, dust and latency attached to the surface of the concrete structure.

  The mortar composition having a surface finish function with a non-land surface adjustment function and an aesthetic appearance of the present invention is less sticky, has excellent workability when applying with a trowel or spatula, and the mortar is fresh. Since it is difficult to droop when it is in a state, it can be thickly coated up to 25 mm, so various shapes and patterns can be molded with a trowel or spatula.

  Hereinafter, the mortar composition having a surface finish function with an uneven surface adjusting function and an aesthetic appearance will be described in detail using examples, but is not limited to the examples.

  An acrylic re-emulsified powder resin, titanium oxide, which is based on mortar with a water-to-cement ratio of 50% and a cement / aggregate / water weight ratio of 1: 1: 0.5. Add about 2.5kg of material that is soft enough to be applied with plastering iron, using inorganic additives to add color, changing the proportion of expanding material and higher fatty acids, adding inorganic pigment to obtain color tone, admixture, fiber, etc. It was prepared by sufficiently stirring with a high-speed hand mixer, and the proportion of the blending in which the present invention was effective was tested.

（実施例１〜７）
表１に示す実施例１〜７の配合において、本発明におけるモルタルで有効な成分であるアクリル系再乳化粉末樹脂、酸化チタン、膨張材、高級脂肪酸の添加量を変化させ性能評価を行った。
（比較例１〜８）
表１に示す比較例１、２はアクリル系再乳化粉末樹脂の添加量、比較例３、４は酸化チタンの添加量、比較例５、６は膨張材の添加量、比較例７、８は高級脂肪酸の添加量に着目して性能評価を行った。

(Examples 1-7)
In the formulations of Examples 1 to 7 shown in Table 1, performance evaluation was performed by changing the addition amounts of acrylic re-emulsified powder resin, titanium oxide, expansion material, and higher fatty acid, which are mortar and effective components in the present invention.
(Comparative Examples 1-8)
Comparative Examples 1 and 2 shown in Table 1 are addition amounts of acrylic re-emulsified powder resin, Comparative Examples 3 and 4 are addition amounts of titanium oxide, Comparative Examples 5 and 6 are addition amounts of expansion material, and Comparative Examples 7 and 8 are Performance evaluation was performed focusing on the amount of higher fatty acid added.

* Product names used in the test formulation are shown below.
Cement: Ordinary Portland cement manufactured by Taiheiyo Cement, Inc. Acrylic re-emulsified powder resin: Movinyl LDM7000P manufactured by Nippon Synthetic Chemical Co., Ltd.
Titanium oxide: Titanium white manufactured by Toda Kogyo Co., Ltd. Expanding material: CSA # 10 manufactured by Electrochemical Co.
Higher fatty acid: Reagent Calcium stearate Fine aggregate: Silica sand No. 5 manufactured by Toyo Materan Inorganic pigment: Baiferox 920G manufactured by LANXESS
Fiber: Nippon Electric Glass Co., Ltd. Chopped Strand ACS6H-103
Thickener: Hi-Metrouse 90SH4000 manufactured by Shin-Etsu Chemical Co., Ltd.
Water retention material: Hojun Co., Ltd. Bentonite Haruna Water reducing agent: Kao Corporation Mighty 21P

Test Method (1) Coating Thickness and Workability Evaluation Examples 1 to 7 and Comparative Examples 1 to 8 were applied to wall surfaces stacked with steps using concrete blocks at a test site with an environmental temperature of 20 ± 2 ° C. About 2.5 kg of the mortar test material was kneaded, and using a plastering iron, a thickness of 2 mm or more was applied, and evaluation was performed based on the following criteria.
○: Thickness of 25 mm or more can be applied, and the workability is good without sticking to the iron. Δ: Thickness of 10 to 25 mm can be applied, the iron is somewhat sticky but the workability is relatively good. There is sagging, workability is bad

(2) Whiteness In order to easily generate primary whiteness of mortar materials, a concrete block with high water absorption performance is installed at a test site having an environment of 3 ± 2 ° C. Similarly, apply a mortar test material that has been kneaded with a plastering iron to a thickness of 2 to 25 mm. After 24 hours, aim at the secondary white flower and spray water evenly onto the test material every 2 hours. This operation was repeated 4 times and the same 4 times on the next day for 3 days, and then allowed to stand for 14 days for evaluation according to the following criteria.
○: No white flower △: Thin white flower phenomenon is seen on the surface, but disappears when rubbed by hand.

(3) Neutralization suppression test In a test room of 20 ± 2 ° C environment, the mortar test material kneaded in the same manner as in the evaluation test of (1) above was placed in a 40 x 40 x 160 mm cuboid mold, The specimen that was demolded the next day was cured outdoors for 28 days under an environmental test at a carbon dioxide concentration of 5%, a relative humidity of 60 ± 10%, and a temperature of 20 ± 2 ° C., and a 1% solution of phenolphthalein was applied. The neutralization depth was measured and evaluated according to the following criteria.
○: Neutralization depth is 3 mm or less on average, and there is neutralization suppression effect ×: Neutralization depth is 3 mm or more on average, and neutralization suppression effect is poor

(4) Crack evaluation test A mortar test material kneaded in the same manner as in the evaluation test of (1) above in a test room of 20 ± 2 ° C. is 5 mm thick on the entire surface of a concrete flat plate having an area of 300 × 300. After the following day, after the 28th exposure outdoors, the presence or absence of cracks was confirmed by visual inspection, and evaluation was performed according to the following criteria.
○: Good without cracking ×: Cracking

(5) Aesthetic performance evaluation test (accelerated weather resistance evaluation test)
A 90 × 90 × 10 mm specimen was prepared using the mortar test material kneaded in the same manner as in the evaluation test of (1) above, and the wavelength QUV− was measured using a super UV test apparatus (machine manufacturer: manufactured by Q Lab Corporation). With the setting of A340nm, temperature 60 ° C, illuminance 0.71W / m ² , UV irradiation and mist spraying every 4 hours for 300 hours, and 20 ± 2 ° C environmental conditions without using test equipment The comparison with what was left still was evaluated visually according to the following criteria.
○: No difference is observed Δ: Partial color fading is observed ×: Discoloration or severe color fading

The results of the tests (1) to (5) are shown in Table 2.

Evaluation Results Hereinafter, using Table 1 and Table 2, the evaluation results will be described based on changes in weight parts of other constituent materials with respect to 100 parts by weight of cement.

  As in Comparative Example 2, the addition amount of 10 parts by weight of the acrylic re-emulsified powder resin is large, and the mortar becomes sticky, resulting in poor workability. However, when the amount of the acrylic re-emulsified powder resin in Example 3 was 8 parts by weight, there was no stickiness and workability was good. As in Comparative Example 4, when the added amount of titanium oxide was 25 parts by weight, the mortar became soft and sagging occurred, and a coating thickness of 25 mm or more could not be secured, and further a delay in curing occurred. When the amount of the higher fatty acid added was 4 parts by weight as in Comparative Example 8, the mixing of the materials was poor and the texture was uneven, resulting in poor workability.

  As in Comparative Example 1, the addition amount of 0.5 parts by weight of the acrylic re-emulsified powder resin was small, and the surface of the mortar finished surface was not dense and the white flower performance fell. Moreover, when the higher fatty acid was not added like the comparative example 7, the inflow and inflow of the water | moisture content of the mortar surface increased, and it became white. However, when the amount of the higher fatty acid added was 0.1 parts by weight as in Example 6, the white flower performance was considerably improved.

  As in Comparative Example 3, the addition amount of 2 parts by weight of titanium oxide is small, and the neutralization suppressing effect is poor. In Comparative Example 5, the amount of the expanded material added is small, and several fine shrinkage cracks occur on the surface. In Comparative Example 6, the amount of the expanded material added is large, and a turtle-shell-shaped expanded crack is generated on the surface. The neutralization of the department became terrible.

  The aesthetic loss due to discoloration in the accelerated weather resistance evaluation test is less discolored with the addition amount of 2 parts by weight of titanium oxide of Comparative Example 3, and the surface cracking occurs with the addition amount of the expansion material of Comparative Examples 5 and 6. Discoloration occurred, resulting in a loss of aesthetics.

  From the above evaluation results, when the addition amount of the acrylic re-emulsified powder resin is less than 2, the performance for white flower and neutralization is not exhibited, and when it exceeds 8, the material becomes sticky and the workability is inferior. When the added amount of titanium oxide is less than 3, the neutralization and discoloration performance is not exhibited. If the amount of the expansion material added is less than 2, shrinkage cracks are generated, and if it exceeds 10, expansion cracks are generated. If the amount of the higher fatty acid added is less than 0.1, water on the mortar surface will be absorbed and discharged more easily, and if it exceeds 3, the material will be scattered and the workability will deteriorate.

  The mortar composition having the surface finish function with the non-land surface adjustment function and the aesthetics of the present invention has good iron workability, and can be corrected by a single iron work if the unevenness of the ground concrete is up to 25 mm, And since it has the ability to keep the surface aesthetics excellent in whiteness suppression performance, neutralization suppression performance, shrinkage cracking suppression performance, weather resistance, if you want to perform the unevenness adjustment and finishing process in a short time, It can also be used as a surface finish for structures that need to be finished with patterns with large irregularities.

Claims (5)

  It was added in an amount of 2 to 8 parts by weight of acrylic re-emulsified powder resin, 3 to 20 parts by weight of titanium oxide, 2 to 10 parts by weight of an expanding material, and 0.1 to 3 parts by weight of higher fatty acid with respect to 100 parts by weight of cement. A mortar composition prepared by adjusting materials with fine aggregate, inorganic pigment, and water, and a method for its construction.   A construction method comprising applying the mortar composition according to claim 1 at a thickness of 2 mm to 25 mm at once using a trowel or a spatula.   The mortar composition according to claim 1, wherein the expansion material is one or more of lime-based and calcium sulfoaluminate-based.   The higher fatty acid according to claim 1, wherein a stearic acid is used.   5. The mortar composition according to claim 1, wherein the stearic acid according to claim 4 uses at least one of calcium stearate, zinc stearate, and magnesium stearate.