JP2009084092A - Mortar-based restoring material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mortar-based restoring material which is excellent in workability in manufacturing and restoring construction, is suitable especially for plastering such as troweling, is substantially free from deterioration in strength, deformation, floating, exfoliation, and cracking for a long term after restoring construction, and is excellent also in durability. <P>SOLUTION: The mortar-based restoring material contains hollow inorganic particles with particle diameters of ≤50 μm which contain Al<SB>2</SB>O<SB>3</SB>of 15-40 mass% and SiO<SB>2</SB>of 40-90 mass% as chemical components, a cellulose-based water retaining agent, an expansive material and metakaolin having a Blaine specific surface area of 8,000-120,000 cm<SP>2</SP>/g. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention mainly relates to a mortar-based restoration material used for repairing a damaged part of a mortar or concrete structure or building.

There was a period when asbestos was used as a workability improver in mortar and mortar for concrete cross-section repair. Since then, due to safety problems, mortar restoration materials have been proposed that use fly ash, silica fume, heated foams of silicate minerals, and the like as materials to replace asbestos, ensuring workability. (For example, refer to Patent Document 1.) However, such a siliceous substance increases in shrinkage after construction as the blending amount increases, and the phenomenon such as cracking, floating, peeling, etc. easily occurs, and durability. It was difficult to obtain a good construction. As a measure to enhance mechanical durability, if the structure is made dense with pozzolanic reactants such as silica fume and fly ash, and a shrinkage-reducing agent and a water reducing agent are used together, the blending ratio of water is reduced to about 200 N / mm ² . It is known that very high compressive strength can also be obtained. (For example, refer to Patent Document 2.) However, this high-strength mortar is not suitable for a restoration material because it requires steam curing for a long time. When a polymer dispersion or a re-emulsified powder resin is mixed and used, deformation followability and adhesion can be improved, and a mortar having properties suitable for plastering such as cross-sectional repair can be easily obtained. In addition to the inclusion of polymer dispersion and re-emulsified powder resin, an expansion material and shrinkage reducing agent are also added to suppress shrinkage, eliminating deterioration phenomena such as deformation, cracking and peeling, and capable of thickening by dredging Mortar is known. (For example, refer to Patent Document 3.) In addition, silica fume, fly ash, metakaolin, etc. are used in combination with polymer mortar, inflating material and a large amount of fine slag powder, to improve mechanical durability such as long-term strength improvement and crack suppression by densification. In addition, cross-sectional restoration materials having chemical durability such as sulfuric acid resistance are also known. (For example, refer to Patent Document 4.) However, the former is a polymer cement mortar that is used for restoration after scraping the deteriorated part, and the construction work requires installation of the formwork. It is very difficult. In addition, the latter contains a large amount of slag grains with a large specific surface area in order to enhance mechanical and chemical durability. As a result, the bulk specific gravity of the binder is reduced, so the mixing workability before water injection is significantly reduced. To do. Changing the slag type and amount to improve mixing workability is likely to cause problems in obtaining sustainable and high durability, while also improving workability during manufacturing and construction from a practical standpoint. It is an essential property for the material.
JP 2001-139357 A JP 2001-181004 A JP-A-2005-336952 JP 2007-161507 A

  The present invention is a mortar-type restoration material with good workability at the time of manufacturing and restoration construction, and is particularly a restoration material suitable for plastering such as plastering. It is an object of the present invention to provide a mortar restoration material which is substantially free from phenomena such as deformation, floating, peeling and cracking and which is excellent in terms of durability.

As a result of intensive investigations for solving the problems, the present inventors have determined that hollow inorganic particles containing a specific amount of Al ₂ O ₃ and SiO ₂ as chemical components and having a specific particle size have metakaolin, an expanding material and cellulose. Cement-based mortar restoration material that is used in combination with water-based water retention agent has good workability at the time of manufacturing and construction, especially excellent plastering work such as plastering, and can express high strength over a long period of time, In addition, since the occurrence of cracks, peeling and the like can be sufficiently suppressed and excellent durability is exhibited, the present invention has been completed.

That is, the present invention relates to hollow inorganic particles having a particle size of 50 μm or less, containing 10 to 40% by mass of Al ₂ O ₃ and 40 to 90% by mass of SiO ₂ as chemical components, a cellulosic water retention agent, an expanding material, and a Blaine specific surface area. It is a mortar restoration material containing metakaolin of 8000 to 120,000 cm ² / g.

  Further, the present invention is the mortar restoration material comprising at least one of a polymer dispersion or a re-emulsified powder resin, a pozzolanic reactant, a fiber, and a water reducing agent.

  The mortar restorative material of the present invention is excellent in workability due to plastering, for example, for cross-sectional repair of concrete structures, etc., so it is difficult to be subjected to construction restrictions such as the repaired part and its shape, and further, mixing workability before water injection Therefore, it can be easily manufactured and used as a premix mortar restoration material, and a restoration having excellent durability over a long period of time can be easily formed.

The mortar restorative material of the present invention contains hollow inorganic particles containing 10 to 40% by mass of Al ₂ O ₃ and 40 to 90% by mass of SiO ₂ as chemical components and having a particle size of 50 μm or less. By containing the hollow inorganic particles, this easily reacts with calcium hydroxide, which is a hydration reaction product of cement, in the presence of water, and CaO—SiO ₂ —Al ₂ O ₃ —H ₂ O gel is produced. It can be generated at a high production rate. When a CaO—SiO ₂ —Al ₂ O ₃ —H ₂ O gel is formed, the structure after hardening becomes dense, and mechanical durability including strength can be enhanced. When the content of Al ₂ O ₃ as a chemical component of the hollow inorganic particles is less than 15% by mass or the SiO ₂ content is less than 40% by mass, CaO—SiO ₂ —Al ₂ O ₃ —H leads to enhanced mechanical durability. _{This is} not preferable because the amount of ₂ O gel produced cannot be secured. Further, when the content of Al ₂ O ₃ as a chemical component of the hollow inorganic particles exceeds 40% by mass, or when the SiO ₂ content exceeds 90% by mass, CaO is sufficient to improve long-term strength development. unfavorably can not be ensured production of _{-SiO 2 -Al 2 O 3 -H 2} O gel. The inorganic particles may contain chemical components other than SiO ₂ and Al ₂ O ₃ . Further, particles having a particle diameter exceeding 50 μm are not preferable because the reaction activity is low and the reaction with calcium hydroxide does not proceed. The lower limit of the particle size is not particularly limited, but is preferably about 1 μm from the viewpoint of handleability and ease of mixing. In addition, the non-hollow structure is not preferable because the reaction activity is low, and the workability of the mortar restoration material is increased, and the workability is lowered due to the difficulty of crushing during dredging. Hollow spherical particles consisting of shells with a thickness of about 5% or less of the particle size are preferred. A method for obtaining hollow spherical particles is not limited in any way, but an example of an industrially obtained method is as follows. Mineral powder containing SiO ₂ and Al ₂ O ₃ as chemical components, if necessary, a foaming aid such as SiC is used. In addition, it can be obtained by molding into a substantially spherical shape and heating and foaming the molded sphere so that the bulk specific gravity is about 0.08 to 0.35.

  The content of the hollow inorganic particles in the mortar restoration material is preferably 0.5 to 3% by mass. If it is less than 0.5% by mass, strength development and construction workability are difficult to improve, so it is not suitable. If it exceeds 3% by mass, the unit volume mass of the mortar restoration material decreases and the unit water volume increases relatively. Therefore, it is difficult to obtain high strength.

  The mortar restoration material of the present invention contains a cellulosic water retention agent. Cellulose water-retaining agents may be any as long as they can be used for mortar and concrete. Can be mentioned. Use of a cellulosic water-retaining agent can maintain an appropriate water-retaining state for a considerable period of time after construction, thereby preventing rapid drying shrinkage. Moreover, the kneadability at the time of pouring water becomes good, and the fluidity suitable for dredging construction is easily developed. The content of the cellulosic water retention agent is preferably 0.05 to 0.15% by mass. If it is less than 0.05% by mass, it is not suitable because appropriate water retention cannot be imparted, and if it exceeds 0.15% by mass, the viscosity is excessively increased and workability may be deteriorated.

  Moreover, the mortar restoration material of the present invention contains an expansion material. The expansion material is not particularly limited as long as it becomes a solid product whose volume is increased from that before the reaction by hydration reaction or the like. Specifically, those having quick lime as an active ingredient and those having an ettringite phase forming substance such as calcium sulfoaluminate as an active ingredient are exemplified. Generation of cracks due to shrinkage can be suppressed by containing the expansion material. As for content in the mortar restoration material of an expandable material, 1-2 mass% is preferable. If it is less than 1% by mass, it is difficult to suppress volume reduction and cracking due to shrinkage. On the other hand, if it exceeds 2% by mass, it is not suitable because it may cause excessive expansion or delayed expansion at low temperatures.

The mortar restoration material of the present invention contains metakaolin. Metakaolin is an intermediate that appears from kaolinite, which is a hydrous clay mineral, until mullite, a dehydrated mineral, is formed by dehydration, for example, by heat treatment. In the present invention, the metakaolin has a specific surface area of 8000 to 120,000 cm ² / g. Use metakaolin. Preferably, since the necessary reaction activity can be ensured, the kaolinite metakaolin obtained by heating 400 ° C. to 700 ° C. is used. By including the metakaolin in the brane, a large amount of CaO—SiO ₂ —Al ₂ O ₃ —H ₂ O-based gel reacts with the hollow inorganic particles and the cement, and is easily produced, increasing the strength development and durability. Sexuality is strengthened. If the Blaine specific surface area is less than 8000 cm ² / g, the production efficiency of the CaO—SiO ₂ —Al ₂ O ₃ —H ₂ O-based gel is reduced, and it is difficult to obtain a dense construction and sufficient durability cannot be obtained. Absent. On the other hand, if the Blaine specific surface area exceeds 120,000 cm ² / g, an increase in the unit water amount is indispensable for obtaining appropriate dredging workability, so that high strength development is not obtained, which is not preferable. In particular, in the case of metakaolin obtained by heating kaolinite at 400 ° C. to 900 ° C., a CaO—SiO ₂ —Al ₂ O ₃ —H ₂ O gel is obtained with a higher production rate. The metakaolin content in the present mortar restoration material is preferably 1 to 4% by mass. Not suitable because a sufficient amount of _{CaO-SiO 2 -Al 2 O 3} -H 2 O -based gel can not be secured for enhanced durability is less than 1 wt%, it exceeds 4 mass%, good in plastering construction In order to ensure workability, it is necessary to increase the unit water amount of the mortar restoration material, which is not appropriate because the strength is lowered.

  Moreover, the restoration | repair material of this invention is mortar, uses cement as a main hardening component, and requires water for fine aggregate and fresh state formation. The cement used for the mortar restoration material of the present invention is not particularly limited. For example, portland cement such as normal, early strength, very early strength, moderate heat, low heat, various mixed cements such as blast furnace cement and fly ash cement, white cement And special cements such as eco-cement. Preferably, early-strength Portland cement is used because the repair effect is exhibited relatively quickly. Early strength Portland cement can be used in combination with ordinary Portland cement, and the best strength development and workability can be obtained by adjusting the blending ratio. As for content in the mortar restoration material of cement, 36-45 mass% is preferable. If it is less than 36% by mass, the cured phase is insufficient and the strength is lowered, which is not suitable. If it exceeds 45% by mass, drying shrinkage increases and cracks or the like may occur, which is not suitable.

  In addition, the fine aggregate used in the mortar restoration material of the present invention is not particularly limited, for example, natural fine aggregates such as river sand, mountain sand, sea sand, crushed sand, volcanic gravel, etc., and polymers such as ethylene vinyl Examples thereof include artificial lightweight fine aggregates containing a resin. Preferably, natural ordinary fine aggregate is preferably used because it is easy to improve the durability of the construction after repair. The content of the fine aggregate is preferably about 45 to 60 parts by mass with respect to 100 parts by mass of cement in the mortar restoration material. If the amount is less than 45 parts by mass, the amount of drying shrinkage increases, and cracking may occur, which is not appropriate. When the fine aggregate content exceeds 60 parts by mass, the aggregate is excessive and the strength is lowered, so that it is not appropriate.

  In addition to the above components, the mortar restorative material of the present invention preferably contains one or more of polymer dispersion or re-emulsified powder resin, pozzolanic reactant, fiber, water reducing agent. .

  The polymer dispersion or re-emulsified powder resin that can be contained in the mortar restorative material of the present invention is not particularly limited as long as it is a polymer dispersion or re-emulsified powder resin that can be used for mortar and concrete. As the polymer dispersion, for example, a polymer dispersion specified in JIS A 6203 can be used, and specific examples include polyacrylic acid ester, styrene butadiene, or ethylene vinyl acetate as an active ingredient. As the re-emulsified powder resin, for example, a re-emulsified powder resin defined in JIS A 6203 can be used. Specifically, polyacrylic acid ester, styrene butadiene, ethylene vinyl acetate, vinyl acetate / versaic acid vinyl ester, acetic acid The thing which uses vinyl / vinyl versatic acid / acrylic acid ester as an active ingredient can be illustrated. By including a polymer dispersion or a re-emulsified powder resin, properties such as adhesion to the precursor, bending strength, crack resistance, and deformation followability can be improved and strengthened. The content of the polymer dispersion or the re-emulsified powder resin in the mortar restoration material is preferably 0.01 to 4% by mass in terms of solid content. If it is less than 0.01% by mass, the blending effect does not substantially appear. Moreover, when it exceeds 4 mass%, viscosity will become high too much and workability | operativity and workability will fall.

Further, the pozzolanic reactant that can be contained in the mortar restoration material of the present invention is not particularly limited as long as it can be used for mortar and concrete and causes a pozzolanic reaction in the presence of water. Specific examples include silica fume, fly ash, slag fine powder, and the like. The inclusion of pozzolanic reactants makes the construction denser, improving durability in the long run and improving dredging workability. The content of the pozzolanic reactant in the mortar restoration material is preferably 1 to 10% by mass. If it is less than 1% by mass, the blending effect does not substantially appear. Moreover, when it exceeds 10 mass%, fluidity | liquidity may fall so that it becomes unsuitable for construction, or there exists a possibility of causing a crack. Silica fume preferably has a brain specific surface area of about 200,000 cm ² / g, and fly ash preferably has a brain surface area of about 2500 cm ² / g. The slag fine powder is, for example, blast furnace slag, waste molten slag or the like, and a powder having a Blaine specific surface area of about 4000 cm ² / g is preferable.

  The fiber that can be contained in the mortar restoration material of the present invention is not particularly limited as long as it is a fiber that can be used in mortar and concrete. For example, a polymer made of a material such as steel fiber, vinylon, aramid, polypropylene, polyethylene, acrylic, or the like. Mention may be made of ceramic fibers made of materials such as fibers, carbon fibers and alkali-resistant glass. Thickening workability and crack resistance are improved by the inclusion of fiber. The fiber content in the mortar restoration material is preferably 1 to 10% by mass. If it is less than 1% by mass, the blending effect does not substantially appear. On the other hand, when it exceeds 10% by mass, the fluidity is lowered, and therefore, when the unit water amount is increased, dry cracking and strength reduction are likely to occur.

  Further, the water reducing agent that can be contained in the mortar restoration material of the present invention may be any one that can be used in mortar or concrete, and in addition to what is simply referred to as a water reducing agent, for example, a high performance water reducing agent, an AE water reducing agent. Even what is called a high performance AE water reducing agent, a fluidizing agent or a dispersing agent can be used. Examples of the component include those having a naphthalene sulfonic acid type, a melamine sulfonic acid type, a lignin sulfonic acid type or a polycarboxylic acid type as an active ingredient. Among these, naphthalenesulfonic acid-based water reducing agents are preferable because a restoration material with good thickness can be easily obtained. Since a fresh state suitable for application work can be easily obtained without increasing the amount of water by containing a water reducing agent, strength reduction can be prevented and dry cracking can be suppressed, and durability can be improved. The content of the water reducing agent in the mortar restoration material is preferably 0.25 to 0.40% by mass in terms of solid content. If it is less than 0.25% by mass, the blending effect does not substantially appear. Moreover, when it exceeds 0.40 mass%, material separation will occur and sclerosis | hardenability will deteriorate remarkably.

  Further, the mortar restorative material of the present invention may further contain components other than the above components, and examples thereof include shrinkage reducing materials, setting retarders, setting accelerators, water repellents, antifoaming agents, antibacterial agents, and the like. be able to. These components can be contained and used as long as the effects of the present invention are not substantially lost.

  The manufacturing method of the mortar restoration material of this invention is not specifically limited, For example, it can manufacture with the method substantially the same as general cementitious mortar. As a specific example, it can be obtained by mixing the above-mentioned blending components into a commercially available mortar mixer, adding water and kneading. The amount of the kneading water is not particularly limited, but is preferably 30 to 50 parts by mass with respect to 100 parts by mass of the cement to be blended. If it is less than 30 parts by mass, it is not suitable because it tends to cause a decrease in adhesive force during construction and a decrease in kneadability during production. It is not suitable because it tends to cause a decrease in the property. When repairing by plastering such as plastering, the amount of kneaded water is more preferably 32 to 45 parts by mass with respect to 100 parts by mass of cement. Moreover, when using this mortar restoration material by spraying construction, 35-50 mass parts of kneading | mixing water amounts are more preferable. In addition, the construction method of the mortar restoration material of the present invention is most suitable for plastering by applying scissors, putty, etc. to a place / part where a concrete structure or the like needs to be repaired. It is not limited to plastering. For example, using a mortar spraying machine and spraying the repaired part with fresh mortar restoration material (spraying construction) You may construct with.

  Hereinafter, the present invention will be described in detail by way of examples, but the present invention is not limited to the examples shown here.

  [Preparation of Mortar Restoring Material] A material selected from A1 to G3 shown below is put into a mortar mixer so as to have the blending amount shown in Table 1, and mixed for 1 minute in an environment of about 20 ° C. and 80% humidity. did. Water of the amount shown in Table 1 is poured into the obtained mixture, and the mixture is further kneaded for about 2 minutes in the same environment to obtain a mortar restoration material (present products 1-8, reference products 11-19). It was.

A1; hollow inorganic particles I (center particle size of about 2 μm, maximum particle size of 51 μm, chemical component content; SiO ₂ : 72.9% by mass, Al ₂ O ₃ : 16% by mass, CaO: 0.9% by mass, MgO: 0.1 wt%, alkali metal oxides: 8.5 wt%, Fe ₂ O _3: 1.1 wt%)
A2: hollow inorganic particles II (center particle size: about 600 μm, maximum particle size: about 800 μm, chemical component content: SiO ₂ : 37.9% by mass, Al ₂ O ₃ : 10.6% by mass, MgO: 21.2 (Mass%, Fe ₂ O ₃ : 9.4 mass%)
A3: Hollow inorganic particles III (center particle size of about 800 μm, maximum particle size of 1.2 mm, chemical components are the same as those of hollow inorganic particles I)
B: Propylmethylcellulose water retention agent (trade name “Marporose 90MP-4T”, manufactured by Matsumoto Yushi Seiyaku Co., Ltd.)
C1: Ordinary Portland cement (manufactured by Taiheiyo Cement Co., Ltd.)
C2: Early strong Portland cement (manufactured by Taiheiyo Cement Co., Ltd.)
D: Expansion material containing free quick lime as an active ingredient (trade name “Pacific Expan Structure”, manufactured by Taiheiyo Materials Co., Ltd.)
E: Metakaolin I (BASF Construction Systems Co., Ltd., BET specific surface area 10 m ² / g)
F1: re-emulsified powder resin (trade name “TITAN 8100”, manufactured by NSC Japan)
F2: Polymer dispersion (Brand name "Movinyl 7700", manufactured by Nichigo Movinyl Co., Ltd.)
F3: Fly ash (JIS A 6201 regulated fly ash type II equivalent)
F4: Silica fume (commercially available product, BET specific surface area 21.2 m ² / g)
F5: Vinylon fiber (commercial product, fiber length of about 6 mm)
F6; naphthalenesulfonic acid AE water reducing agent (manufactured by Kao Corporation)
F7: Normal fine aggregate I (Kashima quartz sand No. 3B)
F8: Ordinary fine aggregate II (an equal weight mixture of Yamagata silica sand No. 6 and No. 7)
G1; blast furnace slag powder (Blaine specific surface area 4000 cm ² / g)
G2: calcium formate (commercially available reagent)
G3: Antifoaming agent (trade name “Agitane P801”, manufactured by Enomoto Kasei Co., Ltd.)

  [Evaluation of Fresh State of Mortar Restoring Material] It was examined whether fresh properties suitable for construction work were obtained, particularly for application work. That is, the mortar flow value was measured by the method according to JIS R 5201 in an environment of a temperature of 20 ° C. and a humidity of 80% with respect to the mortar restoration material just prepared after kneading as described above. Furthermore, a unit volume mass was measured by a method according to JIS A 1171 using a 500 ml stainless steel container. The results are shown in Table 2.

  [Evaluation of glazing workability] The mortar restoration material was evaluated for the mortar restoration material by the following method. First, a 100 × 100 × 15 cm concrete flat plate was placed vertically on the ground with one side of 100 × 15 cm as the bottom surface. A fresh mortar restoration material prepared as described above was applied to one side of the installed concrete flat plate of 100 × 100 cm using a commercially available hammer. The evaluation examined whether or not the following items (1) to (3) were applied, and judged that the mortar restoration material that had all been applied was “good” by applying the mortar. Moreover, the mortar quality restoration material which became the condition which remove | deviates in any one of (1)-(3) was judged that the glazing construction property was "bad". The evaluation results are summarized in Table 2. (1) Coated with a hammer, and the restoration material can be stretched over 10 cm wide without any smears. (2) A mortar restoration material that remained attached to the hammer after coating was not substantially observed. (3) Even if it was applied to a vertical surface to a thickness of about 3 cm, no dripping or peeling was observed within 24 hours.

  [Evaluation of Crack Resistance] Crack resistance was evaluated by the following method for the prepared mortar restoration material. First, a 30 × 30 × 6 cm concrete flat plate was placed perpendicular to the ground with one side of 30 × 6 cm as the bottom. A fresh mortar restoration material was applied to one side of 30 × 30 cm with a hammer. After finishing painting, the concrete plate is left on the same side as the bottom for 28 days in an environment with a temperature of about 20 ° C and humidity of 60%, and then the surface of the work on the plate is visually observed to determine whether cracks have occurred. did. Those where no cracks were observed were judged as “good” crack resistance, and those where cracks were found were judged as “bad” crack resistance. This evaluation result is also shown in Table 2.

  [Investigation of Occurrence of Peeling or Lifting of Construction Work] In the above-mentioned crack resistance evaluation test, in which no cracking was observed after standing for 28 days, it was allowed to stand in the same environment for 60 days. It was visually observed whether the construction floated on a part of the adhesive surface with the flat plate or whether a part of the construction was peeled off. The case where there was no lift or peeling of the construction was judged as “no” over time, and the case other than that was judged as “present”. This evaluation result is also shown in Table 2.

  [Evaluation of Compressive Strength] A fresh mortar restoration material was poured into a forming mold to prepare a 4 × 4 × 16 cm specimen. The specimens were subjected to wet air curing (temperature 20 ° C., humidity 80%) for 24 hours, followed by water curing at 20 ° C. until the age of 3 or 28 days. The compressive strength was measured by the method based on JISR5201 with respect to the test piece after completion | finish of underwater curing. The compressive strength measurement results are also shown in Table 2.

  [Evaluation of bending strength] A mortar restoration material in a fresh state was poured into a molding mold to prepare a 4 × 4 × 16 cm specimen. The specimens were subjected to wet air curing (temperature 20 ° C., humidity 80%) for 24 hours, and then water-cured at 20 ° C. until the age of 28 days. The bending strength of the specimen after completion of underwater curing was measured by a method based on JIS R 5201. The bending strength measurement results are also shown in Table 2.

  From the results of Table 2, the mortar restoration materials of the present invention all show high compression and bending strength even at the age of 28 days, and further, for 2 months or more, neither cracking nor peeling / floating from the fuselage occurred. It turns out that it has high durability in the long term. In addition to such excellent durability, it was easy to obtain fresh properties suitable for plastering, and the plasterability was extremely good. In addition, workability in the manufacturing process such as mixing and kneading was also good. On the other hand, it is understood that the reference product outside of the present invention is not applicable to the mortar restoration material having both the workability and durability because the coating workability is poor or the long-term strength development and construction conditions are sluggish. .

Claims (2)

Hollow inorganic particles having a particle diameter of 50 μm or less, containing 10 to 40% by mass of Al ₂ O ₃ and 40 to 90% by mass of SiO ₂ as chemical components, a cellulose-based water retention agent, an expanding material, and a Blaine specific surface area of 8000 to 120,000 cm ² / g. Mortar restoration material containing metakaolin. The mortar restoration material according to claim 1, further comprising one or more of polymer dispersion or re-emulsified powder resin, pozzolanic reactant, fiber and water reducing agent.