JP5534932B2 - Premix mortar composition and premix non-shrink mortar composition - Google Patents

Description

  The present invention relates to a mortar composition used in the civil engineering / architecture field, and in particular, a premix that maintains the same quality as immediately after production even after a storage period from the production of the mortar composition to the use at the construction site. The present invention relates to a mortar composition and a premix non-shrink mortar composition.

  In general, when producing a hydraulic composition (paste, mortar, or concrete) that uses cement as a hydraulic binder, a water reducing agent is blended in order to reduce unit water volume or increase softness. . Premix mortar compositions such as premix non-shrink mortar compositions are required to have excellent fluidity. Conventionally, powdered naphthalene sulfonate-based water reducing agents have been used as water reducing agents to improve fluidity. Yes.

  A premix mortar composition such as a premix non-shrink mortar composition is usually transported as a dry powder to the site and used by mixing with water on site immediately before the construction work. For this reason, a long-term storage may be required after a premix mortar composition such as a premix no-shrink mortar composition is produced as a dry powder until it is actually used on site. However, when the conventional premixed mortar composition is stored for a long time, there is a problem that the quality deteriorates.

Therefore, in order to maintain the quality immediately after production for a long time after storage, a non-shrink mortar composition (Patent Document 1) containing a predetermined amount of metal aluminum having a predetermined particle size distribution as a foaming agent, cement and BET ratio A polyolefin film (Patent Document 2) that can store a premix cement composition containing a fine powder having a surface area of 5 to 25 m ² / g for a long period of time has been proposed.

  On the other hand, naphthalene sulfonate-based water reducing agents are suspected to be a causative substance of sick house syndrome, and it is required to use alternative water reducing agents. Thus, for example, it has been proposed to use a polycarboxylate-based water reducing agent as an alternative water reducing agent that improves the fluidity of grout using a mortar composition.

  When a polycarboxylate-based water reducing agent is premixed, if it is kneaded with water immediately after the production of a premix mortar composition such as a premix non-shrink mortar composition, no significant decrease in fluidity or the like is observed. However, when premix mortar compositions such as premix non-shrink mortar compositions are kneaded with water after long-term storage, there is a problem that the quality and workability of the hardened cement body are remarkably deteriorated due to a decrease in fluidity and the like. . Conventionally, the fluidity after long-term storage of a premix mortar composition such as a premix non-shrink mortar composition containing a polycarboxylate-based water reducing agent is appropriately selected, and the amount of the component is appropriately adjusted. There was a slight improvement. However, it was not enough. In addition, even when premix non-shrink mortar composition containing polycarboxylate-based water reducing agent is stored in a container with excellent moisture resistance, it cannot prevent the decrease in fluidity after long-term storage. It was.

JP 2001-328856 A JP 2009-132545 A

  In view of the above circumstances, the present invention provides a premixed mortar composition that can suppress a decrease in fluidity and a decrease in fluidity retention even when blended with a polycarboxylate-based water reducing agent and stored for a long period of time. It is an object of the present invention to provide a premix non-shrink mortar composition capable of suppressing a decrease in fluidity and a decrease in fluidity retention even when blended with a polycarboxylate-based water reducing agent and stored for a long period of time.

  A first aspect of the present invention is a premixed mortar composition comprising (A) cement, (B) aggregate, (C) a polycarboxylate-based water reducing agent, and (D) calcium carbonate powder. is there. That is, the premixed mortar composition of the above aspect is blended with a polycarboxylate-based powder that is not a causative agent of sick house syndrome as a water reducing agent, and in order to improve fluidity and fluid retention after long-term storage, calcium carbonate powder Is a powder blended.

  2nd aspect of this invention is characterized by including (A) cement, (B) aggregate, (C) polycarboxylate type water reducing agent, (D) calcium carbonate powder, and (E) expansion | swelling material. It is a premix non-shrink mortar composition. That is, the premix non-shrink mortar composition of the above aspect is a powder in which an expansion material is blended in order to impart non-shrinkage to the premix mortar composition of the first aspect. In this specification, the non-shrinking mortar means an expansion coefficient measured by the Japan Society of Civil Engineers standard "Bleeding rate of filling mortar and expansion rate test method (container method)" (JSCE-F 542-1999). % To 2.0%. Further, in this specification, “fluidity” means fluidity immediately after a premix mortar composition or a premix non-shrink mortar composition is kneaded with water, and “fluidity retention” It means fluidity when a predetermined time elapses after the mixed mortar composition or the premix non-shrink mortar composition is kneaded with water. In addition, the “fluidity” and the “fluidity retention” may be referred to as “fluidity”.

The third aspect of the present invention is the premix non-shrink mortar composition characterized in that the (D) calcium carbonate powder has a maximum particle size of 45 μm or less. 4th aspect of this invention is a premix no contraction mortar composition characterized by including 2-8 mass parts of said (D) calcium carbonate powder with respect to 100 mass parts of said (A) cement. The fifth aspect of the present invention is a premix non-shrink mortar composition further comprising (F) a blowing agent and (G) silica fume. A sixth aspect of the present invention is the premixed non-shrink mortar composition, wherein the (E) expansion material is a mixture of a calcium sulfoaluminate-based expansion material and a lime-based expansion material. In a seventh aspect of the present invention, the premixed non-shrinkable mortar composition is characterized in that the content of the calcium sulfoaluminate-based expansion material in the expansion material (E) is 25 to 75% by mass. It is. In an eighth aspect of the present invention, the foaming agent (F) is at least one selected from the group consisting of an aluminum powder, a sulfonyl hydrazide compound, an azo compound, and a nitroso compound. A mortar composition. A ninth aspect of the present invention is the premix non-shrink mortar composition, wherein the (G) silica fume has a BET specific surface area of 5 to 30 m ² / g. A tenth aspect of the present invention is the premix non-shrink mortar composition, wherein the (A) cement is Portland cement. An eleventh aspect of the present invention is a mortar obtained by mixing the premixed mortar composition and water. A twelfth aspect of the present invention is a mortar formed by mixing the premix no-shrink mortar composition and water.

  According to the present invention, by blending calcium carbonate powder into the premix mortar composition, quality deterioration after long-term storage can be prevented even if a polycarboxylate salt system is used as the water reducing agent. In particular, even if the premix mortar composition is stored for a long period of time, it is possible to suppress both a decrease in fluidity and a decrease in fluidity retention, thereby improving the workability at the work site. Further, by blending calcium carbonate powder into the premix non-shrink mortar composition, quality deterioration after long-term storage can be prevented even if a polycarboxylate salt system is used as a water reducing agent. In particular, even if the premix no-shrink mortar composition is stored for a long period of time, it is possible to suppress both a decrease in fluidity and a decrease in fluidity retention, thereby improving the workability at the work site.

  Next, the premix mortar composition and the premix non-shrink mortar composition according to the embodiment of the present invention will be described. A premix mortar composition according to an embodiment of the present invention includes (A) cement, (B) aggregate, (C) a polycarboxylate-based water reducing agent, and (D) calcium carbonate powder. Each component is as follows.

(A) Cement The cement of the component (A) used in the present invention is not particularly limited. For example, various portland cements such as normal, early strength, ultra-early strength, moderate heat, low heat and sulfate resistance, blast furnace cement And various mixed cements such as silica cement and fly ash cement, alumina cement, and quick-hardening cement. Of these, ordinary Portland cement, early-strength Portland cement, and a mixture of ordinary Portland cement and early-strength Portland cement are preferable from the viewpoint of excellent kneadability and improved mechanical strength. Moreover, the above various cements may be used alone or in combination of two or more.

(B) Aggregate The aggregate of component (B) is blended for preventing shrinkage, reducing heat of hydration, and the like. The aggregate of the component (B) used in the present invention is not particularly limited as long as it is a fine aggregate generally used. For example, river sand, mountain sand, sea sand, beach sand, crushed sand, quartz sand, limestone sand, and the like. Can be mentioned. In addition, from the point of use as premixed products, the various sands are preferably dried products. The various aggregates described above may be used alone or in combination of two or more.

  The maximum particle size of the aggregate is 5 mm or less, preferably 2.5 mm or less, particularly preferably 2.0 mm or less from the viewpoint of preventing separation of the mortar. Further, the upper limit of the amount of aggregate is preferably 200 parts by mass with respect to 100 parts by mass of cement from the viewpoint of preventing a decrease in fluidity before curing and a decrease in compressive strength after curing. 180 parts by mass is particularly preferable from the viewpoint of suppressing a decrease in fluidity and the like and a decrease in compression strength after curing in a balanced manner. On the other hand, the lower limit of the amount of aggregate is preferably 60 parts by mass with respect to 100 parts by mass of cement from the viewpoint of preventing shrinkage and reducing heat of hydration, and more reliably preventing shrinkage and reducing heat of hydration. 80 parts by mass is particularly preferable from the viewpoint of making it.

(C) Polycarboxylate-based water reducing agent (C) The component polycarboxylic acid salt-based water reducing agent is used to increase fluidity before hardening and increase mechanical strength after hardening by dispersing action on cement. It is to be blended. The (C) component polycarboxylate-based water reducing agent used in the present invention is not particularly limited as long as it is a commonly used polycarboxylate-based water reducing agent. For example, a high-performance water reducing agent, an AE water reducing agent, Examples include high performance AE water reducing agents. In the present invention, from the viewpoint of use as a premix product, the polycarboxylate-based water reducing agent is preferably a powder, particularly a dry-processed powder. The above-mentioned various polycarboxylic acid salt water reducing agents may be used alone or in combination of two or more.

  The upper limit of the blending amount of the polycarboxylate-based water reducing agent (in terms of solid content) is preferably 1.2 parts by mass with respect to 100 parts by mass of cement from the viewpoint of preventing delay in setting time and preventing separation of the mortar composition. From the viewpoint of preventing the mechanical strength from being lowered, 0.6 part by mass is particularly preferable. On the other hand, the lower limit of the blending amount of the polycarboxylate-based water reducing agent (in terms of solid content) is preferably 0.06 parts by mass with respect to 100 parts by mass of cement from the viewpoint of improving the fluidity before curing. 0.08 parts by mass is particularly preferable from the viewpoint of miscibility.

(D) Calcium carbonate powder (D) The calcium carbonate powder of the component maintains the fluidity and fluidity retention even if the premix mortar composition and the premix non-shrink mortar composition are stored for a long period of time. It is blended to prevent it. Examples of the calcium carbonate powder include those derived from minerals obtained by pulverizing limestone, calcite and meteorite, and those produced industrially. Further, from the point of use as a premix product, the calcium carbonate powder may be dried by a dryer or the like before blending. The maximum particle size of the calcium carbonate powder is preferably 45 μm or less from the viewpoint of improving flow retention before curing after long-term storage (for example, storage for 1 month) and improving compressive strength. From the point of improving the mechanical strength after storage), 35 μm or less is particularly preferable.

  The upper limit of the blending amount of calcium carbonate powder is 8 parts by mass with respect to 100 parts by mass of cement from the viewpoint of preventing a decrease in compressive strength after curing of a long-term storage product (for example, one month storage). 6 parts by mass is preferable from the viewpoint of excellent strength, and 5 parts by mass is particularly preferable from the viewpoint of excellent balance between the compressive strength and flow retention after long-term storage (for example, storage for one month). On the other hand, the lower limit of the blending amount of calcium carbonate powder is 2 parts by mass with respect to 100 parts by mass of cement from the viewpoint of preventing a decrease in fluidity retention after long-term storage (for example, 1 month storage). 3 parts by mass is preferable from the viewpoint of reliably preventing a decrease in fluidity retention (for example, storage for one month) and securing a pot life, and compressive strength and flow after long-term storage (for example, storage for one month) 4 parts by mass is particularly preferable from the viewpoint of excellent balance with retention.

  In addition to the above-mentioned (A) cement, (B) aggregate, (C) polycarboxylate-based water reducing agent and (D) calcium carbonate powder, the premix no-shrink mortar composition according to the embodiment of the present invention, Furthermore, (E) an expansion material is included.

(E) Expansion material The expansion material of (E) component is mix | blended for the improvement of the mechanical strength after hardening, and ensuring non-shrinkability. The expansion material is not particularly limited as long as it is generally used, for example, lime-based, such as quick lime, limestone and slaked lime, gypsum-based, such as anhydrous gypsum, aluminum-based, such as alumina and aluminum hydroxide, calcium-aluminoferrite-based And calcium sulfoaluminate type. The above-mentioned various expanding materials may be used alone or in combination of two or more.

  As a commercial product of the expansion material, for example, “Expan” (manufactured by Taiheiyo Materials Co., Ltd.) for lime-based materials, “DENKA CSA” (manufactured by Denki Kagaku Kogyo Co., Ltd.) for calcium sulfoaluminate-based materials, etc. it can.

  The expanded material used is preferably a mixed expanded material of a lime-based expanded material and a calcium sulfoaluminate-based expanded material from the viewpoint of preventing bleeding. In addition, the upper limit of the content of the calcium sulfoaluminate-based expansion material in the mixed expansion material is to avoid shortening the pot life during construction and after long-term storage (for example, storage for one month). 75 mass% is preferable from points, such as the outstanding fluidity | liquidity, 65 mass% is especially preferable. On the other hand, the lower limit of the content of the calcium sulfoaluminate-based expansion material in the mixed expansion material is preferably 25% by mass and particularly preferably 35% by mass from the viewpoint of preventing bleeding.

  The upper limit of the amount of the expanded material is 10 parts by mass with respect to 100 parts by mass of cement, and 5 parts by mass is preferable from the viewpoint of improving mechanical strength. On the other hand, the lower limit of the compounding amount of the expansion material is 0.2 parts by mass from the viewpoint of fluidity and the like with respect to 100 parts by mass of cement, and 0.5 mass from the viewpoint of optimization of non-shrinkage and setting time. Part is preferred.

  In the premix mortar composition according to the embodiment of the present invention, in addition to (A) cement, (B) aggregate, (C) polycarboxylate-based water reducing agent and (D) calcium carbonate powder, (F) A foaming agent and (G) silica fume can be mix | blended as needed. In the premix no-shrink mortar composition according to the embodiment of the present invention, (A) cement, (B) aggregate, (C) polycarboxylate-based water reducing agent, (D) calcium carbonate powder and ( E) In addition to the expansion material, (F) a foaming agent and (G) silica fume can be further blended as necessary.

(F) Foaming agent The foaming agent of component (F) is blended in order to generate a gas (for example, an inert gas such as nitrogen gas) at the time of kneading with water to obtain an initial expansion of the grout. The foaming agent is not particularly limited as long as it is generally used, and examples thereof include aluminum powder and aluminum alloy powder. Further, sulfonyl hydrazide compounds, azo compounds and nitroso which generate nitrogen gas by reaction in the mortar composition. A compound etc. can be mentioned. The various foaming agents described above may be used alone or in combination of two or more.

  The blending amount of the foaming agent can be appropriately selected depending on the type of foaming agent to be added. For example, the upper limit of the blending amount of aluminum powder is 0.01 parts by mass with respect to 100 parts by mass of cement from the viewpoint of preventing the matrix from being densified by initial foaming, and prevents a decrease in mechanical strength. From the point, 0.008 parts by mass is preferable. On the other hand, the lower limit of the blending amount of the foaming agent is 0.001 part by mass from the viewpoint of obtaining initial expansion with respect to 100 parts by mass of cement, and 0.003 part by mass is preferable from the viewpoint of reliably imparting expansibility. .

(G) Silica fume (G) The silica fume of a component is mix | blended in order to improve the mechanical strength after hardening about the mortar which uses the premix mortar composition, and the mortar which uses the premix non-shrink mortar composition. Silica fume is not particularly limited as long as it is generally used, and examples thereof include “Meiko MS610” (manufactured by BASF Pozzolith Co., Ltd.), “EFACO” (manufactured by Sakai Kogyo Co., Ltd.), and the like. BET specific surface area of silica fume is preferably 5 to 30 m ² / g from the viewpoint of workability and mechanical strength properties, particularly preferred 15-20 meters ² / g from the viewpoint of separation resistance and strength development properties.

  The upper limit of the compounding amount of silica fume is 40 parts by mass with respect to 100 parts by mass of cement from the viewpoint of strength development, and preferably 20 parts by mass from the viewpoint of fluidity. On the other hand, the lower limit of the compounding amount of silica fume is 0.1 parts by mass with respect to 100 parts by mass of cement from the viewpoint of preventing deterioration of fluidity before curing and improving mechanical strength characteristics after curing. Is 0.2 part by mass.

  Furthermore, in the premix mortar composition and the premix non-shrink mortar composition of the present invention, components that are usually used, for example, an antifoaming agent, a waterproofing agent, a fiber, as long as the effects of the present invention are not impaired. Ingredients such as reinforcing materials such as reinforcing agents, curing accelerators, water repellents, thickeners, rust inhibitors, pigments, setting modifiers, clay minerals such as bentonite, anion exchangers such as hydrotalcite, etc. May be used in combination.

  Both the premix mortar composition and the premix non-shrink mortar composition of the present invention are powders prepared by mixing the above-mentioned components after blending a predetermined amount. The mixing method of each component is not particularly limited, and examples thereof include a mixing method using a general-purpose mixer such as an Eirich mixer, a planetary mixer, and a Henschel mixer.

  The kneading method of the premix mortar composition of the present invention and water and the kneading method of the premix non-shrink mortar composition and water are not particularly limited as long as they are generally used methods. In the case of the premix non-shrink mortar composition, for example, there is a method in which the premix non-shrink mortar composition and water are put into a kneader and kneaded. The upper limit of the amount of water added is 50 parts by mass with respect to 100 parts by mass of the premix no-shrink mortar composition, and 40 parts by mass is preferable in terms of preventing a decrease in mechanical strength after curing. On the other hand, the lower limit value of the amount of water is 25 parts by mass with respect to 100 parts by mass of the premix no-shrink mortar composition, and 30 parts by mass is preferable in terms of workability, kneadability and fluidity before curing. In addition, the specific example of the kneading | mixing method of a premix mortar composition and water is the same as that of the example of an above-described premix non-shrink mortar composition. The kneader to be used is not particularly limited, and examples thereof include general-purpose kneaders such as a hand mixer, a pan mixer, a grout mixer, and a biaxial mixer.

  Next, the present invention will be described in more detail using examples. However, this invention is not limited to the aspect of the Example shown below.

Example 1, Comparative Examples 1-3
(1) About ingredients of premix mortar composition (A) Cement ordinary Portland cement: made by Taiheiyo Cement Co., Ltd. Early strength Portland cement: made by Taiheiyo Cement Co., Ltd. (B) Aggregate quartz sand: produced in Yamagata Prefecture, 5 mm under Manufactured by Kita Nippon Sangyo Co., Ltd. (C) Polycarboxylate water reducing agent water reducing agent a: Modified polycarboxylate water reducing agent ("MELFLUX", manufactured by BASF Japan Ltd.)
Water reducing agent b: Polycarboxylate water reducing agent ("Coreflow NF100", manufactured by Taiheiyo Material Co., Ltd.)
(D) Calcium carbonate powder Calcium carbonate powder a: 45 μm under product, ball mill pulverized product, anhydrous gypsum
Type II anhydrous gypsum: "D-700", manufactured by Noritake Company Limited

  About the said mixing | blending component, the premix mortar composition which concerns on Example 1 and Comparative Examples 1-3 by the mixing | blending composition shown in Table 1 was prepared.

(2) measurement items and the pre-curing method for measuring flow and fluidity retention was measured with J ₁₄ funnel flow time by the Japanese Society of Civil Engineering standard JSCE-F541. J ₁₄ funnel flow time is measured immediately after the completion of kneading with water (2 minutes kneading time) for each of the premixed mortar composition immediately after production and the product stored for 1 month after production. After 10 minutes (10 minutes), 20 minutes after the end of kneading with water (20 minutes) and 30 minutes after the end of kneading with water (30 minutes). J ₁₄ funnel flow time of both the product immediately after production and the product stored for 1 month after production was evaluated as pass when it was 6.0 seconds or more and 10.0 seconds or less, and the determination was “good”. On the other hand, when the flow time of the J ₁₄ funnel at least one of the product immediately after production and the product stored for 1 month after production was less than 6.0 seconds or more than 10.0 seconds, it was evaluated as rejected and described as “x”. Furthermore, when the J ₁₄ funnel flow time exceeded 10 seconds based on the above criteria, the subsequent flow retention measurement was stopped even if it was less than 30 minutes after completion of the kneading with water. In this case, “-” was written.

  Table 2 shows the measurement results of the above measurement items. In addition, the “immediately manufactured product” in Table 2 indicates a product using a premixed mortar composition immediately after preparation. Further, the “one month storage product” refers to a product using a premixed mortar composition which is immediately packaged and stored indoors at room temperature for one month after preparation.

As shown in Table 2, in Example 1 in which calcium carbonate powder was blended with the premix mortar composition, even after storage for 1 month from the preparation of the premix mortar composition, The J ₁₄ funnel flow time was 10 seconds or less at 30 minutes after the kneading. Therefore, even after 1 month of storage from the preparation of the premix mortar composition, it had good fluidity and fluidity retention. As a result, quality deterioration after long-term storage could be prevented even if a polycarboxylate salt was used as the water reducing agent.

On the other hand, in Comparative Examples 1 and 2 in which calcium carbonate powder was not blended in the premix mortar composition, when stored for 1 month after preparation of the premix mortar composition, the J ₁₄ funnel flow time was 20 minutes after the completion of kneading with water. Was over 10 seconds, and the fluid retention was poor. Furthermore, even in Comparative Example 3 in which gypsum, which is said to have an effect of improving fluidity, is stored for one month after the preparation of the premixed mortar composition, J ₁₄ is required in 20 minutes after the completion of the kneading with water. The funnel flow time exceeded 10 seconds and the flow retention was poor.

Example 2 and Comparative Examples 4-6
(1) About the components of the premix non-shrink mortar composition (E) Expansion material expansion material a: Lime-based expansion material "Expan K", Taiheiyo Materials Co., Ltd. expansion material b: Calcium sulfoaluminate-based expansion material “DENKA CSA # 20” manufactured by Denki Kagaku Kogyo Co., Ltd. (A) component normal Portland cement and early strong Portland cement, (B) component quartz sand, (C) component water reducing agent a and water reducing agent b, And about the calcium carbonate powder a which is (D) component, it is the same as the mixing | blending component used in above-described Example 1 and Comparative Examples 1-3.

  About the said mixing | blending component, the premix non-shrink mortar composition which concerns on Example 2 and Comparative Examples 4-6 was prepared by the compounding composition shown in Table 3.

(2) About measurement item and measurement method-Fluidity and fluid retention before curing: The same as in Example 1 and Comparative Examples 1 to 3 described above.

  Table 4 shows the measurement results of the above measurement items. From Table 4 onward, “immediately manufactured product” in the table refers to a product using a premix non-shrink mortar composition immediately after preparation. In addition, “stored for one month” refers to a product using a premixed non-shrink mortar composition which is immediately packaged and stored indoors at room temperature for one month.

As shown in Table 4, Example 2, in which calcium carbonate powder was blended with the premix non-shrink mortar composition, was kneaded with water even after 1 month of storage from the preparation of the premix non-shrink mortar composition. Immediately afterwards, the J ₁₄ funnel flow time was 10 seconds or less at 30 minutes after completion of the kneading with water. Therefore, even after 1 month storage from the preparation of the premix no-shrink mortar composition, it had good fluidity and fluidity retention. As a result, quality deterioration after long-term storage could be prevented even if a polycarboxylate salt was used as the water reducing agent.

On the other hand, in Comparative Examples 4 and 5 in which calcium carbonate powder was not blended with the premix non-shrinkable mortar composition, if the premix non-shrinkage mortar composition was stored for one month, J _{14 The} funnel flow time exceeded 10 seconds, and the flow retention was poor. Furthermore, even in Comparative Example 6 containing gypsum, which is said to have an effect of improving fluidity and the like, if it is stored for one month after the preparation of the premix no-shrink mortar composition, it will take 20 minutes after the end of kneading with water. The J ₁₄ funnel flow time exceeded 10 seconds and the flow retention was poor.

Examples 3-6, Comparative Examples 7-10
(1) About the components of the premix no-shrink mortar composition (F) Foaming agent foaming agent a: aluminum powder, “aluminum powder”, Yamato Metal Powder Industry Co., Ltd. foaming agent b: benzenesulfonylhydrazide foaming agent, “Neoselbon 1000S”, Eiwa Kasei Kogyo Co., Ltd. (G) Silica fume: “Meiko MS610”, BASF Pozzolith Co., Ltd. (BET specific surface area 20 m ² / g)
(A) component normal Portland cement and early strong Portland cement, (B) component quartz sand, (C) component water reducing agent a and water reducing agent b, component (D) calcium carbonate powder a and ( About the expansion | swelling material which is E) component, it is the same as that of the mixing | blending component used in above-described Examples 1-2 and Comparative Examples 1-6.

  About the said mixing | blending component, the premix non-shrink mortar composition which concerns on Examples 3-6 and Comparative Examples 7-10 was prepared with the compounding composition shown in Table 5.

(2) About measurement item and measurement method-Fluidity and fluid retention before curing: The same as in Examples 1 to 2 and Comparative Examples 1 to 6 described above.

  Table 6 shows the measurement results of the above measurement items.

As shown in Table 6, Examples 3 to 6 in which calcium carbonate powder was blended with a premix non-shrink mortar composition, even when a foaming agent and silica fume were blended, were prepared as a premix non-shrink mortar composition. Even after storage for 1 month, the J ₁₄ funnel flow-down time was 10 seconds or less both after the end of kneading with water and 30 minutes after the end of kneading with water. Therefore, even after 1 month storage from the preparation of the premix no-shrink mortar composition, it had good fluidity and fluidity retention. As a result, quality deterioration after long-term storage could be prevented even when a foaming agent and silica fume were blended.

On the other hand, in Comparative Examples 7 to 10 in which calcium carbonate powder was not blended in the premix non-shrink mortar composition, when stored for one month after the preparation of the premix non-shrink mortar composition, in 20 minutes after the completion of the kneading with water. The J ₁₄ funnel flow time exceeded 10 seconds, and the flow retention was poor.

Examples 7-10, Comparative Examples 11-18
(1) Compounding components of premix non-shrink mortar composition (D) Calcium carbonate powder Calcium carbonate powder b :: Under 300 μm, inventor pulverized product (A) Normal Portland cement and early strength Portland cement (B) component silica sand, (C) component water reducing agent a, component (D) calcium carbonate powder a, component (E) expansion material a and expansion material b, component (F) About the silica fume which is a foaming agent a and (G) component, it is the same as that of the compounding component used in above-described Examples 1-6 and Comparative Examples 1-10.

  About the said mixing | blending component, the premix non-shrink mortar composition which concerns on Examples 7-10 and Comparative Examples 11-18 was prepared with the compounding composition shown in Table 7.

(2) About measurement item and measurement method-Fluidity and fluidity retention before curing: The same as in Examples 1 to 6 and Comparative Examples 1 to 10 described above.
Compressive strength: According to JSCE-G505-1999 “Testing method for compressive strength of mortar or paste using cylindrical specimen”, cement hardened body using premixed non-shrinkable mortar composition after storage for one month from preparation. The compressive strength at 1 day and 3 days of age was measured. Compressive strength, 20.0N / mm ² or more in a day an age, and was judged as acceptable 50.0N / mm ² or more in age of 3 days.

  Table 8 shows the measurement results of the above measurement items. In Table 8, when both the fluidity before curing and the criteria of flow retention and compressive strength were satisfied, the judgment was “good”, and the others were judged as “good”.

As shown in Examples 7 to 10 of Table 8, when 2 to 8 parts by mass of calcium carbonate powder a which is a 45 μm under product is blended with respect to 100 parts by mass of Portland cement, 1 from the preparation of the premix no-shrink mortar composition even after months storage, immediately after the completion of kneading with water, kneading completion after 30 minutes both with water, J ₁₄ funnel flow time is 10 seconds or less, were excellent in flowability. Further, when 2 to 8 parts by mass of calcium carbonate powder a, which is a 45 μm under product, is blended with respect to 100 parts by mass of Portland cement, the compressive strength is 24 N / mm ² or more at 1 day of age and 51 N / 3 at 3 days of age. and mm ² or more, was excellent in mechanical strength by using a premix non-shrink mortar composition after 1 month storage.

  In addition, as shown in Example 9, when 6 parts by mass of calcium carbonate powder a, which is a 45 μm-under product, was blended with 100 parts by mass of Portland cement, the compressive strength was particularly improved. Furthermore, as shown in Example 10, when 8 parts by mass of calcium carbonate powder a, which is a 45 μm under product, is blended with respect to 100 parts by mass of Portland cement, good compressive strength is maintained even if the product is stored for 1 month. However, the fluidity retention for 30 minutes after completion of the kneading with water was particularly excellent.

On the other hand, as shown in Comparative Example 11, when 1 part by mass of calcium carbonate powder a, which is a 45 μm-under product, is blended with 100 parts by mass of Portland cement, 30 minutes after completion of kneading with water for a one-month storage product J ₁₄ funnel flow time exceeded 10 seconds, and flow retention decreased. Further, as shown in Comparative Example 12, when 10 parts by mass of calcium carbonate powder a, which is 45 μm under, is added to 100 parts by mass of Portland cement, the compressive strength at 3 days of age becomes less than 50 N / mm ² , and the machine Strength decreased.

  As shown in Comparative Examples 13 to 18 in Table 8, even when calcium carbonate powder b, which is an under 300 μm product, is blended with 100 parts by mass of Portland cement, both the fluid retention and compressive strength of the one-month storage product are reduced. Could not prevent. This was the same even when 2 to 8 parts by mass of calcium carbonate powder b, which is an under 300 μm product, was added to 100 parts by mass of Portland cement (Comparative Examples 14 to 17).

Examples 11-14
(1) About premix non-shrinkable mortar composition (A) Normal Portland cement and early strength Portland cement as component, (B) Silica sand as component, (C) Water reducing agent a, (D) Regarding the calcium carbonate powder a as the component, the expansion material a and the expansion material b as the component (E), the foaming agent a as the component (F), and the silica fume as the component (G), Examples 1 to 10 described above And it is the same as the mixing | blending component used by Comparative Examples 1-18.

  About the said mixing | blending component, the premix no contraction mortar composition which concerns on Examples 11-14 was prepared with the compounding composition shown in Table 9. FIG.

(2) About measurement item and measurement method-Fluidity and fluid retention before curing: The same as in Examples 1 to 10 and Comparative Examples 1 to 18 described above.
Bleeding test: The product immediately after production was measured by JSCE-F533 “Testing method for PC grout bleeding rate and expansion rate (container method)”.

  Table 10 shows the measurement results of the above measurement items. In Table 10, judgment was made when both the fluidity before curing and the criteria of both fluidity retention and bleeding test were satisfied, “◎”, although some bleeding occurred, it had the criteria of fluidity and fluidity retention before curing. In this case, the determination was “◯”, and the other determination was “x”.

  As shown in Table 10, when a mixture of a lime-based expansion material a and a calcium sulfoaluminate-based expansion material b is used, it is possible to prevent quality deterioration of the hardened cement body without causing bleeding in a product immediately after production. (Examples 11 to 13). On the other hand, when the lime-based expansive material a is used alone, the fluidity and fluidity of the one-month storage product are good, but the quality deterioration of the hardened cement body is sufficiently prevented from the point that slight bleeding occurs. (Example 14).

  When the premix mortar composition and the premix non-shrink mortar composition of the present invention are used, excellent fluidity and fluidity retention are maintained even after long-term storage, so that civil engineering, construction structures and grout materials are maintained. Can be used as

Claims (10)

(A) a cement, a (B) aggregate, (C) polycarboxylate-based water reducing agent, and (D) calcium carbonate powder containing Mpu Les mix mortar composition,
The (D) calcium carbonate powder has a maximum particle size of 45 μm or less and contains 2 to 8 parts by mass of the (D) calcium carbonate powder with respect to 100 parts by mass of the (A) cement. Mortar composition . (A) cement, (B) aggregate, a (C) polycarboxylate-based water reducing agent, (D) including Mpu Remikkusu non-shrink mortar composition calcium carbonate powder and (E) expanding material,
The (D) calcium carbonate powder has a maximum particle size of 45 μm or less and contains 2 to 8 parts by mass of the (D) calcium carbonate powder with respect to 100 parts by mass of the (A) cement. Non-shrink mortar composition . The premix non-shrink mortar composition according to claim 2 , further comprising (F) a foaming agent and (G) silica fume.   The premix non-shrink mortar composition according to claim 2, wherein the (E) expansion material is a mixture of a calcium sulfoaluminate-based expansion material and a lime-based expansion material. The premix non-shrink mortar composition according to claim 4 , wherein the content of the calcium sulfoaluminate-based expansion material in the expansion material (E) is 25 to 75 mass%. The premix non-shrink mortar composition according to claim 3 , wherein the foaming agent (F) is at least one selected from the group consisting of aluminum powder, sulfonyl hydrazide compounds, azo compounds and nitroso compounds. . The premix non-shrink mortar composition according to claim 3 , wherein the (G) silica fume has a BET specific surface area of 5 to 30 m ² / g.   The premix non-shrink mortar composition according to claim 2, wherein the (A) cement is Portland cement.   A mortar obtained by mixing the premixed mortar composition according to claim 1 and water. A mortar obtained by mixing the premix non-shrink mortar composition according to any one of claims 2 to 8 and water.