JP2007084420A - Mortar composition, coating material, and spray material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mortar composition having acid resistance and ozone resistance so that it can be used not only in an acid atmosphere such as in sewage treating system but also in an ozone atmosphere such as in an advanced water-purifying system, capable of keeping at least 2 cm coating thickness using a trowel or by spraying, and not liable to generate a crack, and a coating material for a plasterer and a spray material. <P>SOLUTION: This mortar composition is prepared by compounding fine aggregate (S) comprising number 3-8 silica sand to a binder composition (B) containing cement, silica fume, granulated blast furnace slag, fly ash, and an expanding agent, and, if necessary, anhydrous gypsum, and the binder composition (B) contains the cement at 40-50 wt.%, and the weight ratio S/B of the binder composition (B) to the fine aggregate (S) is made to be 2.05-2.15. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mortar composition having acid resistance and ozone resistance, and suitable as a coating material for water and sewage pipes or a treatment tank in an advanced water purification treatment facility, and a coating material comprising the mortar composition and spraying Regarding materials.

  The surface of concrete members used in acid wastewater treatment facilities in sewage treatment facilities and chemical product factories is constantly exposed to an acidic atmosphere, so that deterioration is severe. Therefore, conventionally, suppression of deterioration has been studied, and one of them is a method of covering with acid-resistant mortar.

  For example, Patent Document 1 describes a method of applying an acid-resistant mortar composition comprising alumina cement, alumina cement clinker aggregate, and steelmaking dust to the surface of a concrete compact.

Various acid-resistant mortars suitable for repairing deteriorated concrete are also known.
For example, Patent Document 2 discloses that (A) molten slag powder having a CaO / SiO ₂ molar ratio of 0.10 to 1.20, (B) water glass, (C) alumina cement, (D) blast furnace slag and An acid-resistant mortar containing a binder selected from furnace slag, dephosphorization slag, decalcification slag and desulfurization slag is described.

Further, Patent Document 3, alumina cement, acid-resistant mortar composition of CaO and Al ₂ O ₃ containing spherical granules consisting mainly is described as a chemical component.
On the other hand, in recent years, in order to improve the quality of tap water, advanced water purification treatment is performed in a process in which processes such as an ozone treatment process and a biological activated carbon adsorption treatment process are newly added. Such advanced water purification treatment removes substances that cause musty odor and ammoniacal nitrogen that cause odor of odor, which cannot be adequately handled by normal water treatment (precipitation, filtration, disinfection) This is done to reduce the amount of substances.

And most of each said process is performed in the concrete tank made from the ordinary concrete. However, when ozone treatment or biological activated carbon adsorption treatment as described above is performed in a concrete treatment tank, the concrete in the treatment tank will deteriorate faster than the concrete deterioration in the treatment by the conventional water purification treatment. Has become a problem.
On the other hand, when a material containing an organic substance is used in the treatment tank, there is a problem that the organic substance is decomposed in the course of ozone treatment or biological activated carbon adsorption treatment, and water quality safety cannot be ensured.

As a result of intensive investigations on measures for suppressing this deterioration, the present inventors have found that a hydraulic inorganic material having ozone resistance, carbonic acid / bicarbonate resistance, wear resistance, and an advanced water purification treatment facility using the same. Has been developed and applied as Japanese Patent Application No. 2005-179924.
In addition, a method of suppressing deterioration by covering with a mortar made of the same material as the hydraulic inorganic material is conceivable. Specifically, it is a method of applying or spraying a mortar having acid resistance and ozone resistance onto a concrete surface where deterioration is to be suppressed.

However, in order to use this hydraulic inorganic material as a coating material (a plastering material), it is unclear whether the iron finish is good, whether it can be thickly coated, and whether there are sufficient measures against cracks when thickly coated. The problem of solution was left. Moreover, when using as a spraying material, the unsolved problem with respect to securing of a thickness and a crack was left like the above.
JP 2004-292245 A Japanese Patent Laid-Open No. 2001-240456 JP 2002-97055 A

  The present invention has been made in view of the above circumstances, and has acid resistance and ozone resistance so that it can be used not only in an acidic atmosphere such as a sewerage treatment facility but also in an ozone atmosphere such as an advanced water purification treatment facility. In addition, water quality safety can be secured even in advanced water purification treatment, and a mortar composition that can secure a thickness of at least about 2 cm by using a cocoon or by spraying, and hardly causes cracks, and plastering coating material and spraying thereby. The purpose is to provide materials.

  As a result of intensive studies on the above problems, the present inventors have found that the binder composition contains at least cement, silica fume, blast furnace granulated slag, fly ash, and an expansion material, and further contains anhydrous gypsum as necessary. The inventors have found that the above-mentioned object can be achieved by using a mortar composition composed only of a hydraulic inorganic material in which a specific fine aggregate is blended with an object, and the present invention has been completed.

  That is, in order to achieve the above object, the present invention comprises a binder composition comprising cement, silica fume, blast furnace granulated slag, fly ash, and an expansion material, and also containing anhydrous gypsum as necessary. B) is a mortar composition obtained by blending fine aggregate (S) composed of No. 3 to No. 8 silica sand, and the binder composition (B) contains 40 to 50% by weight of cement, A weight ratio S / B between the binder composition (B) and the fine aggregate (S) is 2.05 to 2.15.

  Further, the mortar composition according to the present invention is composed of 20 to 30% by weight of ordinary Portland cement, silica fume, blast furnace granulated slag, and fly ash in an embodiment from a practical viewpoint. In addition, 100 parts by weight of the inorganic composition (N) containing anhydrous gypsum is further blended with 35 to 45 parts by weight of early-strength Portland cement or eco-cement and 2.5 to 3.5 parts by weight of an expanding material. The binder composition (B) and fine aggregate (S) 250 to 350 parts by weight made of No. 3 to No. 8 silica sand are included. In the mortar composition of this embodiment, the inorganic composition (N) comprises 20 to 30% by weight of ordinary Portland cement, 15 to 25% by weight of silica fume, and 25 to 35% by weight of granulated blast furnace slag. It consists of 20 to 35% by weight of fly ash, and preferably contains anhydrous gypsum as needed.

  Moreover, it is preferable that the said binder composition (B) contains 2-20 weight part of clay minerals further with respect to 100 weight part of said inorganic compositions (N).

  The mortar composition according to the present invention has a particle size constitution of the fine aggregate (S), and the passage rate of each sieve is as follows: 1.2 mm sieve is 80 to 95% by weight, 0.6 mm sieve is 45 to 60% by weight, The 0.3 mm sieve is preferably 25 to 35% by weight, and the 0.15 mm sieve is preferably 10 to 30% by weight.

  In order to further improve the bending strength and the crack prevention effect, it is preferable that 0.05 to 2% by volume of the fiber (F) is further contained in the mortar composition according to the present invention.

  Another aspect of the present invention is a plaster coating material, which is characterized by comprising the mortar composition. Similarly, in another aspect, the present invention is a spray material and is characterized by comprising the mortar composition. In the present specification, the advanced water purification treatment facility refers to a treatment facility including a step of treating water using ozone.

  The mortar composition of the present invention is suitable as a plastering coating material or spraying material from the viewpoints of workability, strength, coating thickness, cracking, etc. while maintaining acid resistance. Therefore, in an acidic atmosphere such as a sewage treatment facility, it has a wide range of applicability as a mortar covering material such as an excellent plasterer or a concrete frame by spraying. In addition, the mortar composition of the present invention does not contain organic materials and is made of only hydraulic inorganic materials, so it is highly safe for the human body and the environment, and can also be applied to coating materials in waterworks treatment facilities and advanced water purification treatment facilities. it can.

  Hereinafter, the mortar composition, coating material, and spraying material according to the present invention will be described in more detail with reference to embodiments thereof.

The mortar composition according to the present invention is roughly divided into a binder composition (B) and a fine aggregate (S). And a fiber (F) is included as needed.
Binder composition (B)
The binder composition (B) includes at least cement, silica fume, blast furnace granulated slag, fly ash, and an expansion material. And anhydrous gypsum is added as needed.

As the cement, ordinary Portland cement, early-strength Portland cement or ultra-early-strength Portland cement such as Portland cement, eco-cement, or a mixture thereof is used.
Among the cements, early-strength Portland cement such as early-strength Portland cement or ultra-early-strength Portland cement, or eco-cement is used in a necessary amount mainly from the viewpoint of securing initial strength and preventing cracking. If it is used too much, acid resistance and ozone resistance may deteriorate depending on the formulation. These early-strength Portland cement or eco-cement preferably contains 35 to 45 parts by weight in the binder composition (B) with respect to 100 parts by weight of the inorganic composition (N) described later. Moreover, it is preferable that the total amount of the cement combined with the ordinary Portland cement in the inorganic composition (N) is 40 to 50% by weight in the binder composition (B). If it is less than 40% by weight, sufficient strength may not be obtained. If it exceeds 50% by weight, acid resistance and ozone resistance may be insufficient.

  Silica fume is used in a necessary amount from the viewpoint of ensuring the required strength, improving acid resistance and ozone resistance. The particle size and fineness of silica fume are not particularly limited, but the range specified in JIS A 6207 is preferable. Silica fume is preferably contained in an inorganic composition (N) described later in an amount of 15 to 25% by weight. If it is used too much, fluidity may decrease. If the amount is too small, the required strength, acid resistance and ozone resistance may be insufficient.

The required amount of granulated blast furnace slag is used from the viewpoints of ensuring fluidity, improving chemical durability, acid resistance, and ozone resistance. Fineness of granulated blast furnace slag is particularly but not limited to, 10000 cm ² / g is preferably from 4000 cm ² / g in Blaine value. Blast furnace granulated slag is preferably contained in an inorganic composition (N) described later in an amount of 25 to 35% by weight. When the amount is less than 25% by weight, fluidity, chemical durability, acid resistance and ozone resistance may not be improved. If it exceeds 35% by weight, cracks may occur when the granulated blast furnace granulated slag has a high degree of fineness.

  Fly ash is used in necessary amounts from various viewpoints such as ensuring fluidity (workability), ensuring coating thickness, preventing cracks, and improving acid resistance and ozone resistance. Although the kind of fly ash is not specifically limited, What is prescribed | regulated to JISA6201 is preferable. The fly ash is preferably contained in an inorganic composition (N) described later in an amount of 25 to 35% by weight. If it is less than 25% by weight, fluidity (workability), coating thickness, crack prevention, and acid / ozone resistance may not be improved. If it exceeds 35% by weight, sufficient strength may not be obtained.

  The expansion material is used in a necessary amount from the viewpoint of preventing cracking and reducing drying shrinkage. The expansion material is an inorganic powder expansion material, and examples thereof include a quicklime expansion material (for example, New Expan manufactured by Taiheiyo Materials Co., Ltd.) and a calcium sulfoaluminate expansion material (for example, Denka CSA manufactured by Denki Kagaku Kogyo Co., Ltd.). . The kind of expansion material to be used is not particularly limited. In the binder composition (B), the expansion material preferably contains 2.5 to 3.5 parts by weight with respect to 100 parts by weight of the inorganic composition (N) described later. When the amount of the expanded material used is less than 2.5 parts by weight, cracking prevention and drying shrinkage reduction may be insufficient. If the amount of the expansion material used exceeds 3.5 parts by weight, the acid resistance and ozone resistance may be insufficient, which may cause a pop-out phenomenon or swell expansion, which is not preferable.

  Anhydrous gypsum is added to the binder composition (B) as necessary. By adding anhydrous gypsum, an increase in initial strength and an improvement in fluidity can be obtained. Anhydrous gypsum is preferably contained in an inorganic composition (N) described later in an amount of 5% by weight or less. By adding, the initial strength can be increased and the fluidity can be improved. If it exceeds 5% by weight, delayed expansion may occur, which is not preferable.

Fine aggregate (S)
In the present invention, in order to achieve the above object, silica sand having a specific particle size range is used. The reason why such silica sand is used is to obtain good characteristics from the viewpoints of workability when used as a coating material or spraying material, securing of thickness, and prevention of cracking. Specifically, the fine aggregate is a fine aggregate formed by blending No. 3 to No. 8, preferably No. 3 to No. 6 and No. 8 silica sand. No. 3 silica sand has a particle size in the range of about 1.2 to 2.4 mm. No. 4 silica sand has a particle size in the range of about 0.6 to 1.2 mm. No. 5 silica sand has a particle size in the range of about 0.3 to 0.8 mm. No. 6 silica sand has a particle size in the range of about 0.2 to 0.4 mm. No. 8 silica sand has a particle size in the range of about 0.05 to 0.2 mm. In addition, No. 7 silica sand has a range of about 0.1 to 0.3 mm. No. 7 silica sand can be used in place of part of No. 6 silica sand or No. 8 silica sand as required.

  In addition, as for the suitable particle size structure of the said fine aggregate (S), 1.2 mm sieve is 80 to 95 weight%, 0.6 mm sieve is 45 to 60 weight%, and 0.3 mm sieve as a passage rate of each sieve. 25-35 wt%, 0.15 mm sieve is 10-30 wt%. When the particle size is in this range, when used as a coating material or a spraying material, workability is good, and securing of thickness and prevention of cracking are facilitated. For example, in fine aggregate (S), No. 3 silica sand is 30 to 40% by weight, No. 4 silica sand is 5 to 25% by weight, No. 5 silica sand is 5 to 25% by weight, No. 6 silica sand is 15 to 25% by weight, If the No. 8 silica sand is 10 to 20% by weight, the range of the sieve passing rate can be substantially satisfied.

  Therefore, a more preferable ratio of each No. silica sand in the fine aggregate (S) is, for example, about 35 wt% for No. 3 silica sand, about 15 wt% for No. 4 silica sand, and 15 wt. %, No. 6 silica sand is about 20% by weight, and No. 8 silica sand is about 15% by weight.

  The fine aggregate (S) needs to be blended so that the weight ratio S / B is 2.05 to 2.15 with respect to the binder composition (B). If it is less than 2.05, the amount of cement per unit volume increases, and cracking due to drying shrinkage or the like may occur easily. On the other hand, if it exceeds 2.15, the amount of cement per unit volume decreases, and sufficient strength may not be obtained. If sufficient strength cannot be obtained, cracks may occur due to restraint of the base such as walls.

More practical as compounding the mortar composition of the present invention the mortar composition is basically made of a binder composition (B) and the fine aggregate (S).
On the other hand, as described above, a hydraulic inorganic material having acid resistance and osson resistance mainly used for a concrete frame has been developed according to Japanese Patent Application No. 2005-179924. The invention of the mortar composition of the present invention has been made as a result of studying the application of the hydraulic inorganic material to a coating material (a plastering material) or a spraying material. Therefore, in this specification, in order to clarify the relationship with the hydraulic inorganic material and the positioning of the mortar composition, the concept of the inorganic composition (N) was introduced and explained. Further, when preparing the mortar composition of the present invention, such a hydraulic inorganic material is prepared as an inorganic composition (N), and an early-strength Portland cement such as early-strength Portland cement or eco-friendly is further added to the inorganic composition. It is preferable from a practical aspect to mix cement, an expansion material, fine aggregate (S), and the like in an external ratio. This is because, if the inorganic composition (N) is prepared, not only concrete but also a mixture separately based on this can be used for applications such as coating materials and spraying materials.

  In producing the mortar composition of the present invention, for example, it contains 20 to 30% by weight of ordinary Portland cement, is composed of silica fume, blast furnace granulated slag, and fly ash, and optionally contains anhydrous gypsum. An inorganic composition (N) is used, and with respect to 100 parts by weight of the inorganic composition (N), 35 to 45 parts by weight of early-strength Portland cement or eco-cement, and 2.5 to 3.5 parts by weight of an expanding material It is a more practical technique to mix the fine aggregate (S) made of No. 3 to No. 6 and No. 8 silica sand as containing 250 to 350 parts by weight. If the fine aggregate (S) is less than 250 parts by weight, cracks are likely to occur depending on the construction method. Moreover, when it exceeds 350 weight part, workability | operativity will worsen depending on the construction method.

  As described above, the breakdown of the inorganic composition (N) is preferably 15 to 25% by weight of silica fume, 25 to 35% by weight of granulated blast furnace slag, and 25 to 35% by weight of fly ash. Anhydrous gypsum added is 5% by weight or less. If it is the thing of this range, the coating material and spraying material which have acid resistance and ozone resistance will be easy to be obtained.

  Moreover, it is preferable that 2-20 weight part of clay minerals are contained in the binder composition (B) with respect to 100 weight part of the inorganic composition (N). If it is less than 2 parts by weight, a sufficient effect cannot be obtained. When the amount exceeds 20 parts by weight, workability is deteriorated unless the amount of kneading water is increased. Preferred examples of the clay mineral include sepiolite, metakaolin (calcined kaolin), allophane and bentonite.

  Since sepiolite has a property of excellent water retention, the addition of sepiolite makes cracks less likely to occur. By adding metakaolin (calcined kaolin) or allophane, resistance to permeation of sulfate ions, chloride ions and the like is increased, so that acid resistance is improved. Since bentonite has swelling properties, the addition of bentonite does not cause sagging and enables thicker coating.

  In order to further improve the bending strength and the crack prevention effect, it is preferable to include 0.05 to 2% by volume of the fiber (F) with respect to the mortar composition. If it is less than 0.05% by volume, a sufficient effect cannot be obtained. If it exceeds 2% by volume, the workability is deteriorated unless the amount of kneading water is increased. Examples of the fiber include organic fibers such as vinylon, polypropylene and nylon, and inorganic fibers such as glass. The type of fiber is not particularly limited as long as effects such as improvement in bending strength and prevention of cracks can be obtained. The fiber length is preferably 3 to 30 mm. If it is less than 3 mm, sufficient improvement in bending strength and further improvement in crack prevention effect cannot be obtained. When it exceeds 30 mm, workability will deteriorate unless the amount of kneading water is increased. In addition, inorganic fibers such as glass are preferred for use in advanced water purification treatment facilities, but organic fibers can be used as long as the elution amount in the 45 items elution test based on the Ministry of Health and Welfare Ordinance No. 15 is less than the reference value. .

Production of mortar composition The mortar composition of the present invention is preferably produced as a premixed mortar. In this case, the said constituent material is mixed and manufactured by the method similar to manufacturing the conventional premix mortar. More preferably, only the inorganic composition (N) is produced as a premix material, and this premix material and early-strength Portland cement or eco-cement, an expansion material and a fine aggregate are mixed later. In addition to these, early-strength Portland cement, expansion material and fine aggregate may be used as separate premix materials, and this premix material and the premix material of the inorganic composition (N) may be mixed on site. . Alternatively, the binder composition (B) may be used as a premix material, and the premix material and a fine aggregate (S) having a predetermined blending ratio may be mixed on site.

  What is necessary is just to perform the mortar composition of this invention containing a fiber by the method similar to the manufacture of the conventional fiber mortar. When mixing the fibers, the fibers cut in advance may be mixed with the premix material, or the mortar composition, the fibers and water may be mixed during kneading.

Mortar composition of the coating material the invention, sewage treatment facilities, water supply treatment plant, advanced water treatment concrete deterioration preventing mortar covering material in facilities, can be suitably used as cross restorative material when repairing a degraded concrete However, it is better to use it as a plastering material. By using the mortar composition of the present invention, a thick coating of 2 cm can be performed with good workability without generating cracks or sagging. The applied coating material has acid resistance and ozone resistance. In addition, the amount of kneading water at the time of producing the coating material is preferably 13 to 15% by weight with respect to the mortar composition. The coating material of the present invention can be obtained, for example, by adding kneaded water to the premix material or the like at the construction site and kneading.
For the construction, for example, a net woven in a mesh shape may be installed at a construction location, and then the coating material of the present invention may be applied to a predetermined thickness using a plastering iron.

Spray Material The mortar composition of the present invention can be used as a spray material in addition to the coating material. By using the mortar composition of the present invention, a spraying thickness of 2 cm can be ensured without cracking or sagging when sprayed. Moreover, the applied spraying material has acid resistance and ozone resistance. In addition, the amount of kneading | mixing water at the time of manufacturing a spraying material is good to 13 to 15 weight% with respect to a mortar composition like a coating material. The spray material of the present invention can be obtained, for example, by adding kneaded water to the premix material or the like at the construction site and kneading. The spraying method may be performed according to a conventional method. A normal spraying machine may be used.
The construction may be carried out by installing the net woven into a mesh shape at the construction site and spraying the spraying material of the present invention using a spraying machine as described above.

Examples and comparative examples according to the present invention are shown below.
As Examples 1 to 11 and Comparative Examples 1 to 7, mortar compositions shown in Table 1 were prepared. Test bodies were prepared using the mortar compositions of Examples 1 to 11 and Comparative Examples 1 to 7, and the following various tests were performed. Table 2 shows the particle size distribution of the fine aggregate (S) in each example and comparative example.

In Table 1, units other than the ratio are parts by weight.
Moreover, the symbol in a table | surface shows the following raw materials.
Symbol NC: Normal Portland cement (manufactured by Taiheiyo Cement)
Symbol BS: Blast Furnace Granulated Slag (Brain 4000 grade manufactured by Day Shi)
Symbol FA: Fly Ash (manufactured by Power Supply Development Company, Class II equivalent)
Symbol SF: Silica fume (Norway)
Symbol AG: anhydrous gypsum (Thai natural anhydrous gypsum)
Symbol HC: Early strong Portland cement (manufactured by Taiheiyo Cement)
Symbol EC: Ecocement (made by Taiheiyo Cement)
Symbol EX: Expansion material (New Expan made by Taiheiyo Materials Co., Ltd.)
Symbol 3Q: No. 3 quartz sand (silica sand N30 manufactured by Nichetsu)
Symbol 4Q: Mixed sand of No. 4 and 5 silica sand (Yamagata silica sand mix manufactured by Maeda Construction Materials Co., Ltd.)
Symbol 6Q: No. 6 quartz sand (Toshu Sand Co., Ltd. Enshu quartz sand)
Symbol 8Q: No. 8 silica sand (Niche Tsuchibu silica sand No. 8 made by Nichetsu)
Symbol SE: Sepiolite (trade name: Sepiolite coarse)
Symbol ME: Metakaolin (Burges Isberg)
Symbol GF: Glass fiber (Nippon Electric Glass Co., Ltd. chopped thrust ACS6H-103)
Symbol W: Tap water Symbol C: Cement Symbol B: Binder composition Symbol N: Inorganic composition Symbol S: Fine aggregate

  Furthermore, tap water (W) was mix | blended with the coating material using the mortar composition which concerns on the said Examples 1-11 and Comparative Examples 1-7, and the coating material was prepared. Similarly, the spray material was adjusted. The ratio of tap water (W) to the total of the binder composition (B) and fine aggregate (S) in these is shown in Table 3 below.

A. Basic Performance Confirmation Test Using the mortar compositions according to Examples 1 to 11 and Comparative Examples 1 to 7, first, an acid resistance test, an ozone resistance test, and an elution test were performed.

A-1. Acid resistance test A specimen specified in JIS R5201 was molded, cured in water until the age of 28 days, immersed in a 5% sulfuric acid solution for 30 days, and the mass change rate of the specimen was measured.

  The results of the acid resistance test are shown in Table 4 below.

  In the mortar compositions according to Examples 1 to 11 and Comparative Examples 1 and 3 to 6, there was no decrease in mass due to immersion in the sulfuric acid solution, and the acid resistance was excellent. In Comparative Example 2 where 55 parts by weight of early strength Portland cement is used with respect to 100 parts by weight of the inorganic composition (N) and C / B is 0.54 (the amount of cement in the binder composition is 54% by weight) Resulted in a large decrease in the mass of the specimen after immersion in the sulfuric acid solution, resulting in poor acid resistance. In Comparative Example 7 in which the binder composition (B) was only ordinary cement, the mass reduction of the specimen after immersion in the sulfuric acid solution was significant. In order to have excellent acid resistance, the inorganic composition (N) is indispensable. For Comparative Example 7, the subsequent test was not performed.

A-2. Sulfuric acid penetration depth A-1. In the acid resistance test, the specimen whose mass change rate was measured was cut with a bending strength test device, a phenolphthalein solution was applied to the cross section that appeared, and the depth from the surface of the non-colored portion was measured. The results are shown in Table 5 below.
The specimens of Examples 1 to 11 each had a sulfuric acid penetration depth of about 5 mm, and exhibited good characteristics. In particular, Examples 5 to 7 to which metakaolin was added had a better result of about 2 mm.

A-3. Ozone Resistance Test After the mortar specimen was cured under water until the age of 28 days, the mass change rate after immersion for 2, 4 and 10 weeks in a test tank maintained at a dissolved ozone gas concentration of 2 ppm and a temperature of 20 ° C. in tap water was measured.

  The results of the ozone resistance test are shown in Table 6 below.

  In the mortar compositions according to Examples 1 to 11 and Comparative Examples 1 and 3 to 6, all good results were obtained in the ozone resistance stability test. Similarly to the acid resistance result, 55 parts by weight of early strong Portland cement is used with respect to 100 parts by weight of the inorganic composition (N), and C / B is 0.54 (the amount of cement in the binder composition is 54 weights). %), The decrease in the mass of the specimen after acid immersion was large, resulting in poor ozone resistance.

A-4 . Dissolution Test 2000 Ministry of Health and Welfare Decree No. 15 (Revised 2000 Ministry of Health and Welfare Ordinance No. 127, 2002 Ministry of Health, Labor and Welfare Ordinance No. 139, 2004 Ministry of Health, Labor and Welfare Ordinance No. 5) A 45-item elution test was conducted according to No. 45 (test on materials such as materials and equipment).

  In the mortar compositions according to Examples 1 to 11 and Comparative Examples 1 to 6, since the elution amount in the 45 items of the elution test was less than the standard value, the safety to the human body and the environment is excellent, and the water supply facility It was confirmed that it is effective for the application.

B. Performance Confirmation Test as Coating Material Next, using the mortar compositions according to Examples 1 to 11 and Comparative Examples 1 to 6, the compression strength, the adhesive strength, the rate of change in length, and the case of being used as a coating material Tests were conducted to confirm the occurrence of cracks, workability, and whether or not there was sag.

B-1. Compressive strength The compressive strength was measured by the method specified in JIS R 5201. The age was 1, 3, 7, 28 days.
The results of the compressive strength test are shown in Table 7 below.

  In Comparative Examples 1 and 6 having a low C / B and Comparative Example 4 having a high S / B, the compression strength was low. In Examples 1 to 11 in which 35 parts by weight or more of early-strength Portland cement or eco-cement was used with respect to 100 parts by weight of the inorganic composition, good strength expression was obtained from the initial stage.

B-2. Adhesive strength A coating material prepared from 10 liters of a mortar composition was kneaded with a hand mixer, and after the mortar was applied to the wall, the adhesive strength was measured at a material age of 7 days. The adhesion test method was carried out according to JSCE-K 531-1999.
The measurement results at a coating thickness of 2.0 cm are shown in Table 8 below.

  In Comparative Examples 1 and 6 having a low C / B and Comparative Example 4 having a high S / B, the expression of adhesive strength was low. In Examples 1 to 11 in which 35 parts by weight or more of early-strength Portland cement or eco-cement was used with respect to 100 parts by weight of the inorganic composition, good adhesion strength was obtained.

B-3. Length change rate It was performed by the method prescribed in JIS A 1129. It was carried out 7, 14, 28 days after underwater curing until the age of 7 days.
The results of measuring the length change rate are shown in Table 9 below.

  In Comparative Examples other than Comparative Example 2, the length change rate was large. In Examples 1 to 11 using 35 parts by weight or more of early-strength Portland cement or eco-cement with respect to 100 parts by weight of the inorganic composition, a small rate of change in length was obtained compared to the comparative example.

B-4. Confirmation of the crack generation state The coating material prepared using the mortar composition on the wall was applied with a lacquer with a coating thickness of 0.5 cm, 1 cm, 2 cm, and 2.5 cm, and then the crack generation state was visually observed.
The results are shown in Table 10 below.

  In Comparative Example 1 having a low C / B, cracks occurred after 3 days when the coating thickness was 0.5 cm, and after 10 days in other cases. In Comparative Example 3 with low S / B, cracks occurred after 1 day when the coating thickness was 0.5 cm, after 3 days in other cases, and in Comparative Example 4 with high S / B after 3 days. In Comparative Example 5 in which no expansion material was used, cracks occurred after 10 days. In Comparative Example 6 in which none of early-strength Portland cement, eco-cement, or expansion material was used, cracks occurred after one day. On the other hand, in Examples 1 to 11 in which early strength Portland cement or eco cement and an expansion material are used, C / B is 0.40 to 0.50, and S / B is 2.05 to 2.15. No cracks were observed. In particular, it was good in Sepiolite, Example 1, Example 4, Example 9, Example 10 and Example 11 using glass fiber.

B-5. Workability, presence / absence of sagging As with the test of B-4, mortar was applied to the wall with a thickness of 0.5cm, 1cm, 2cm, 2.5cm using a scissors to visually confirm the workability and sagging evaluated.
The results are shown in Table 11 below.

  In Comparative Example 6 in which No. 3 silica sand was not used, the mortar was sticky, the workability deteriorated, and sagging occurred. All other mortars had good workability, and no sagging occurred.

C. Performance confirmation test as a spraying material Using a spraying test machine as described below, a performance confirmation test was performed when the mortar compositions of Examples 1 to 11 were used as a spraying material.
Kneading with a mortar mixer of 0.75 KW and capacity of 0.08 m ³ , sucking up with a squeeze pump of 3.7 KW and discharge volume of 70 liters / minute, spraying using a taper tube with a diameter of 50 mm and 40 mm, and using an inverter The discharge amount was adjusted.

Cracks, workability, and the presence or absence of sagging when the mortars of Examples 1 to 11 were sprayed onto the wall at a coating thickness of 0.5 cm, 1 cm, 2 cm, and 2.5 cm were visually evaluated. The adhesive strength was measured at a material age of 7 days at an adhesion thickness of 2.0 cm. The adhesion test method was carried out according to JSCE-K 531-1999.
The results are shown in Table 12.

  The spray materials using the mortar compositions according to Examples 1 to 11 all had good adhesive strength and workability, and no sagging occurred. Also, no cracks occurred in any mortar at the age of 28 days.

  As understood from the results of Examples 1 to 11 and Comparative Examples 1 to 7 above, acid resistance, ozone resistance, and compression strength, adhesive strength, and length change rate required as a coating material and spraying material Examples 1 to 11 that fall within the scope of the present invention were able to obtain satisfactory characteristics with respect to the occurrence of cracks, workability, sagging, and the like.

Claims (8)

  Fine bone made of No. 3 to No. 8 silica sand to a binder composition (B) made of cement, silica fume, blast furnace granulated slag, fly ash, and expandable material, and optionally also containing anhydrous gypsum. A mortar composition comprising a material (S), wherein the binder composition (B) contains 40 to 50% by weight of the cement, and the binder composition (B) and the fine aggregate A mortar composition having a weight ratio S / B to (S) of 2.05 to 2.15.   20 to 30% by weight of ordinary Portland cement, silica fume, blast furnace granulated slag, and fly ash, and if necessary, 100 parts by weight of an inorganic composition (N) containing anhydrous gypsum, even faster. Fine bone made of 35 to 45 parts by weight of strong Portland cement or eco-cement and 2.5 to 3.5 parts by weight of the expansion material (B) and 3 to 8 silica sand The mortar composition according to claim 1, comprising 250 to 350 parts by weight of the material (S).   The inorganic composition (N) contains 20 to 30% by weight of ordinary Portland cement, 15 to 25% by weight of silica fume, 25 to 35% by weight of blast furnace granulated slag, and 20 to 35% by weight of fly ash. The mortar composition according to claim 2, further comprising anhydrous gypsum as necessary.   The mortar composition according to claim 2 or 3, wherein the binder composition (B) further comprises 2 to 20 parts by weight of clay mineral with respect to 100 parts by weight of the inorganic composition (N).   The fine aggregate (S) has a particle size constitution, and the passing rate of each sieve is 80 to 95% by weight for 1.2 mm sieve, 45 to 60% by weight for 0.6 mm sieve, and 25 to 35% by weight for 0.3 mm sieve. %, 0.15 mm sieve is 10-30% by weight, mortar composition according to any one of claims 1-4.   A mortar composition comprising 0.05 to 2% by volume of fibers (F) with respect to the mortar composition according to any one of claims 1 to 5.   A coating material comprising the mortar composition according to any one of claims 1 to 6.   The spray material which consists of a mortar composition in any one of the said Claims 1-6.