JP2672027B2 - Rapid cement composition and rapid mortar composition - Google Patents

Description

TECHNICAL FIELD The present invention relates to a rapid hardening cement composition and a rapid hardening mortar composition using the same.

[Prior art and its problems] Conventionally, as this type of mortar composition, a waterproof material composition comprising an ethylene-vinyl acetate copolymer emulsion having a glass transition temperature of the copolymer of -15 to 15 ° C and alumina cement. Alternatively, a mortar composition comprising white cement, white alumina cement, hemihydrate gypsum, polymer dispersion and aggregate has been proposed (Japanese Patent Publication No. 1-39).
713 and Japanese Patent Publication No. 2-10112).

However, with these compositions, there is a problem that rapid hardening and strength development after being kneaded with water are lacking, the time from the end of enforcement to actual use is long, and the request for shortening the construction period cannot be met. It was

Further, since the waterproof material composition described in JP-B-1-39713 is characterized by the emulsion used, it is difficult to use it for applications other than the waterproof material, and since only alumina cement is used as the cement, There are problems such as lack of hardness and long-term strength retention, and poor pigment dispersibility when producing a color mortar composition.

On the other hand, Portland cement, alumina cement, etc. are used as cement when producing color mortar.

However, Portland cement is 4CaO ・ Al ₂ O.
_It tends to be colored depending on the mineral composition of ₃ · FeO ₃ , and further tends to be colored by R ₂ O ₃ impurity components such as Fe ₂ O ₃ , TiO ₂ and Mn ₂ O ₃ .

Further, the color of the alumina cement, bauxite used, aluminum oxide obtained by the Bayer method, in raw materials such as quick lime and limestone, Fe ₂ O ₃ , TiO ₂ , MgO, SiO ₂ ,
The present alumina cement is used as a cement when producing color mortar, which is influenced by the amount and form of impurities such as K ₂ O and Na ₂ O, the manufacturing method such as firing method and melting method, and the particle size during clinker crushing. It was insufficient.

Therefore, there has been a demand for a quick-hardening white cement, but the prior art is insufficient in terms of pot life and quick-hardening, and its solution has been awaited.

As a result of intensive studies to solve the above problems, the present inventors have found that the mineral composition of alumina cement, particularly Al ₂ O ₃
Paying attention to the fact that the whiteness is affected by the content of the cement, and by using a specific rapid-hardening cement composition and rapid-hardening mortar composition, rapid hardening, strength development and long-term strength retention are achieved. The present invention has been completed based on the finding that a cement hardened product that is excellent and has little color unevenness when colored with a pigment can be obtained.

[Means for solving the problem]

That is, the present invention relates to a rapid-hardening material comprising anhydrous gypsum / alumina cement having a weight ratio of anhydrous gypsum / alumina cement of 0.1 to 5, white cement, and 100 parts by weight of the total of the rapid-hardening material and white cement. A rapid-hardening cement composition containing 5 to 200 parts by weight of an admixture as a main component, a rapid-hardening mortar composition containing the rapid-hardening cement composition and an aggregate as main components, and further containing a pigment. It is a rapid hardening mortar composition.

 Hereinafter, the present invention will be described in detail.

The white cement according to the present invention, what is referred to as white portland cement, as with ordinary Portland cement, as mineral composition, but mainly the hydraulic calcium silicates such as 3CaO · SiO ₂ and 2CaO · SiO _2, ordinary portland 4CaO ・ Al ₂ O ₃・ F
The eO ₃ mineral composition was made as small as possible, and 3CaO / Al ₂ O ₃ was roughly adjusted.

As for the cause of coloring of Portland cement, it is said that the influence of R ₂ O ₃ impurity components such as Fe ₂ O ₃ , TiO ₂ and Mn ₂ O ₃ is large, but among them, the influence of Fe ₂ O ₃ is considered to be the largest. Has been.

Therefore, the white cement according to the present invention is Fe ₂ O ₃
Is preferably less than 0.5%, and 0.3% or less is more preferable because the color of the pigment becomes glossy when combined with the pigment.

The rapid hardening material according to the present invention comprises anhydrous gypsum and alumina cement.

The anhydrous gypsum according to the present invention includes type I, type II and
Illustrative examples include type III anhydrous gypsum, among which type II anhydrous gypsum is preferable from the viewpoint of rapid hardening strength development by combining with other materials.

In addition, the particle size of anhydrous gypsum is important in order to bring out the synergistic effect of the combination with other materials.

Generally, most of the particle sizes of anhydrous gypsum that are commercially available have a Blaine value of 2,000 to 3,000 cm ² / g.
In the present invention, preferably 3,000 cm ² / g or more, 4,000 cm ²
/ g or more is preferable, and a finely pulverized product of 6,000 cm ² / g or more is most preferable.

The alumina cement according to the present invention is preferably white and / or white type alumina cement.

In particular, the content of Al ₂ O ₃ in the alumina cement, from the aspect of rapid hardening, strength development and luster of the color of the cured product,
70% or more is preferable and 72 to 89% is more preferable.

Further, the alumina cement according to the present invention, CaO · Al
Other ₂ O _3, hydraulic calcium aluminate such as 12CaO · 7Al ₂ O ₃ and CaO · 2Al ₂ O _3, be those containing alpha · Al ₂ O _3, As commercially available products, manufactured by electrochemical Co. Product name "High Alumina Cement", "High Alumina Cement NEO", "High Alumina Cement D""High Alumina Cement # 8"
0 "," High Alumina Cement F "," High Alumina Cement Super "," High Alumina Cement Super 2 "," High Alumina Cement Super 90 "," High Alumina Cement Super G "and" High Alumina Cement Super F "etc. Alcoa product name "CA14", "CA
15 "," CA25 "," CA25 type C "and" CA25 type G "and the like, and Lafarge's product names" Secal 80 "," Secal 70 "," Secal 71 "and the like can be used.

Further, as particularly preferable alumina cement, aluminum hydroxide and / or aluminum oxide obtained by the Bayer method is used as an alumina source, and CaO 90% or more limestone and / or CaCO ₃ 95% or more limestone is used as a calcia source. , mineral composition, after blending as CaO · Al ₂ O ₃ is 50% or more, such as firing method or by a rotary kiln or a shaft kiln, an electric furnace, the clinker produced by the melting method according to open hearth and reverberatory furnace or the like, need According to, Al ₂ O ₃ in alumina cement is 70% or more, preferably 72 to 89%, so that the component is adjusted by adding α-alumina, other than CaO · Al ₂ O ₃ , 12CaO / 7Al ₂ O ₃
It is also possible to contain CaO.2Al ₂ O ₃ as a hydraulic mineral.

The grain size of the alumina cement is preferably 4,000 cm ² / g or more in terms of Blaine value, and more preferably 4,500 cm ² / g or more.

In particular, it is preferable that the calcination rate of the calcium aluminate-based mineral in the alumina cement is 70 to 100% from the viewpoint of rapid hardening and strength development of the entire rapid hardening mortar composition. Ca
If the O.Al ₂ O ₃ crystal content is low, the strength of the rapid-hardening cement composition is lacking, and if the crystallization rate is less than 70%, the pot life tends to be insufficient during operation. .

The crystallization rate (%) of the calcium aluminate mineral is calculated by the following formula.

Crystallization rate (%) = (peak diffraction peak area / total peak area) × 100 Further, from the viewpoint of whiteness when using alumina cement as a white quick-hardening cement composition and a quick-hardening mortar composition, powder It is preferable that the whiteness value by a method Hunter whiteness meter is an index of 60 or more, preferably 70 or more.

The weight ratio of anhydrous gypsum / alumina cement in the rapid hardening material is 0.1-5. If the weight ratio of anhydrous gypsum alumina cement is less than 0.1, ettringite (3Ca
O · Al ₂ O ₃ / 3CaSO ₄ · 31 to 32H ₂ O) is less produced, and rapid hardening and strength tend to be insufficient. If the weight ratio of anhydrous gypsum / alumina cement exceeds 5, excess CaSO ₄ will be present after the hydration reaction, resulting in decreased rapid hardening, insufficient strength and white sinter, and durability due to dissolution of CaSO ₄ . It tends to cause a decrease in Particularly, it is more preferable that the weight ratio of anhydrous gypsum / alumina cement is 0.2 to 2.

The quick-hardening cement composition in the present invention contains white cement and a quick-hardening material as the main components, and with respect to 100 parts by weight of white cement, a mixture of 20-300 parts by weight of the quick-hardening material is used. preferable. If the ratio of the rapid hardening material is less than 20 parts by weight relative to 100 parts by weight of white cement, rapid hardening and strength development are insufficient, and if it exceeds 300 parts by weight, the pot life at the time of implementation tends to be insufficient. . From the viewpoint of the balance between pot life, rapid hardening and strength, 25 to 100 parts by weight of the quick hardening material is preferable to 100 parts by weight of white cement.

The polymer admixture according to the present invention, by compounding, is excellent in elasticity, can prevent the occurrence of cracks, and can exhibit excellent adhesiveness to an applied part, specifically, an aqueous polymer dispersion, a powder. Examples thereof include emulsions, water-soluble polymers and liquid polymers.

Examples of the aqueous polymer dispersion include rubber latex, resin emulsion and mixed dispersion.

Specifically, as an aqueous polymer dispersion,
Polyacrylic ester (PAE), polyvinyl acetate (PVA
C), acrylic ester styrene, polyvinyl propionate (PVP), ethylene vinyl acetate (EVA), polypropylene (PP), chloroprene rubber (CR), styrene butadiene rubber (SBR), acrylonitrile butadiene rubber (NBR), methacrylic acid Examples thereof include methyl butadiene rubber (MBR) and natural rubber latex (NR).

Also, powder emulsions include ethylene vinyl acetate (EVA), vinyl acetate and vinyl versatate (VAVeo
Va) and the like.

Examples of water-soluble polymers include cellulose derivatives (methyl cellulose), polyvinyl alcohol (PVA), and acrylates such as calcium acrylate and magnesium acrylate.

Examples of liquid polymers include unsaturated polyester resins and epoxy resins.

Specifically, "New Admixture for Concrete, 199-2
Although the polymer admixture described in "Page 16, published in 1989" can be used, in the present invention, an aqueous polymer dispersion is preferable from the viewpoint of dispersibility of the polymer in a cured product.

Further, a powder emulsion such as EVA or VAVeoVa is particularly preferable because it is easy to handle by premixing.

The aqueous polymer dispersion, the water-soluble polymer and the liquid polymer are preferably kneaded separately with the powder material, and the powder emulsion is mixed with the powder material in advance and kneaded with water at the time of execution. preferable.

The amount of the polymer admixture used is 5 to 200 parts by weight based on 100 parts by weight of the total amount of the rapid hardening material and the white cement. 5
If it is less than 100 parts by weight, it lacks elasticity, and if it exceeds 200 parts by weight, the curing of the mortar tends to be delayed or the strength tends to be insufficient.

As a polymer admixture, when using a dispersion, 20 to 150 parts by weight, and when using a powder emulsion, 10 to 100 parts by weight, properties such as rapid hardening, strength development, elasticity and crack prevention. Is preferred.

The aggregate according to the present invention is specifically sand and colored sand, limestone grains, rock grains, etc.
The materials described in No. 415 “Special Issue on Aggregate”, September 1981 issue can be used. In particular, those which are unlikely to cause salt damage and white sinter are preferred, and those having a particle size of JIS 5 to 8 or so are preferable, and JIS 6 to 8 or equivalent are more preferable in terms of filling property, depending on the use and construction site. .

The colored sand is obtained by using river sand, silica sand, crushed sand of rock grains, sea sand, mountain sand, etc. as a raw material, and coating the surface of the particles with a coloring material having good alkali resistance, weather resistance and affinity.

It is important that the aggregate used contains as little as possible soluble components such as calcium, potassium and sodium in order to prevent white sinter and discoloration after curing.

The amount of the aggregate used is preferably 50 to 500 parts by weight with respect to 100 parts by weight of the quick-hardening cement composition, and the required characteristics of the enforcement site, such as strength, crack prevention and adhesiveness, and the bone to be blended. The amount used can be appropriately changed depending on the particle size of the material, but usually 100 to 300 parts by weight is preferable in terms of strength and elasticity.

The pigment according to the present invention is an inorganic pigment, and specifically, red iron oxide, Fe ₂ O ₃ , FeO, Fe ₂ O ₃ · H ₂ O and Fe ₂ O ₃ · F.
Examples thereof include synthetic iron oxide such as eO, chromium oxide, and titanium oxide.

The particle size of the pigment is 1,000 to 8,000 in terms of Blaine value because it has excellent light resistance and dispersibility when used and does not deteriorate workability and strength characteristics of the mortar kneaded product.
cm ² / g are preferred, particularly 2,000~6,000cm about ² / g and more preferably from the viewpoint of dispersibility of the mortar. Blaine value is 1,000c
If it is less than m ² / g, it tends to be too coarse to cause uneven coloring, and if it exceeds 8,000 cm ² / g, it tends to agglomerate to give a shade of coloring.

Further, the pigment is preferably mixed with other materials in advance so as to be uniformly dispersed in the cured body.

The amount of pigment used depends on the intended color and the pigment used.
Although the optimum amount is determined as appropriate, a rapid hardening cement composition
It is preferably 100 parts by weight or less with respect to 100 parts by weight, and particularly preferably less than 50 parts by weight from the viewpoint of dispersibility, uniformity and coloring degree of the pigment.

In the present invention, since a white powder is blended, if the target color is white, it is possible to perform the operation without using a pigment. When the target color is red, the maximum amount of pigment used is 3 per 100 parts by weight of the rapid hardening cement composition.
Stable coloring can be obtained in an amount of 0 to 40 parts by weight, and in the case of a blue type, 40 to 50 parts by weight.

As a mixing method of each material, at least one kind of powder or solid content may be premixed and mixed with a mixer such as an omni mixer, a Nauta mixer, a V blender, a corn blender and a pan mixer. ,Also,
Although all the materials may be mixed at the execution site, when a pigment is used, it is preferable to previously mix the pigment with at least one kind of powder or solid content from the viewpoint of uniform dispersion of the pigment.

The order of mixing each material is to mix anhydrous gypsum, alumina cement, white cement and pigment from the viewpoint of the effect of rapid hardening material and uniform dispersion of pigment, and then aggregate, and then polymer admixture as required. It is preferable to mix them.

The quick-hardening cement composition of the present invention can be used by a conventional method and, if necessary, with addition of water, for spraying with a cement lysing gun or mortar spraying gun, coating with a trowel, and the like.

In addition, long-term strength improvement, shrinkage relaxation and crack
For the purpose of preventing warpage, a material having a pozzolanic activity, for example, slag powder, fly ash, silica fume and the like can be added as an admixture in an appropriate amount. In particular, silica fume is preferable from the viewpoint of water retention, and slag powder and fly ash are preferable from the viewpoint of long-term strength. Each admixture can be used alone or in combination.

Further, for the purpose of improving the pot life and the curability of the rapid hardening cement composition and the rapid hardening mortar composition, an AE water reducing agent, a water reducing agent,
A curing retarder, a curing accelerator, and the like, specifically, lignin sulfonate, formalin condensate, melamine sulfonate formalin condensate, polycarboxylate, phosphoric acid, boric acid, and oxycarboxylic acid. Acid type or its salts,
Additives such as concrete admixtures and alumina cement additives that are commonly used can be used alone or in combination as long as the characteristics of the present invention are not impaired.

〔Example〕

 Hereinafter, the present invention will be described with reference to examples.

Reference Example 1 A quick-hardening cement composition was prepared with the composition shown in Table 1. As the other materials, a first-grade reagent manufactured by Ishizu Pharmaceutical Co., Ltd. was used.

With respect to 100 parts by weight of the quick-hardening cement composition, 200 parts by weight of aggregate and 60 parts by weight of tap water were kneaded with a mixer to prepare a mortar kneaded product.

For comparison, instead of white cement, using jet cement manufactured by Sumitomo Cement Co., Ltd. of ultra-rapid hardening cement and early strength Portland cement manufactured by Onoda Cement Co., Ltd., and instead of anhydrous gypsum, using gypsum dihydrate or gypsum hemihydrate. It carried out similarly. The results are shown in Table 1.

(Physical property measurement method)

All physical properties were measured as follows in a thermostatic chamber at 20 ° C.

Pot life; time immediately after pouring water until the kneaded material is softened by touching strength; compressive strength after casting the kneaded material into a 4 x 4 x 16 cm mold and curing for a predetermined time.

Hardened body color; Visual [Materials used] White cement: White cement made by Onoda Cement Anhydrous gypsum; Type II, Central Glass, Blaine 4,0
00cm ² / g Gypsum dihydrate; Central Glass Co., Ltd., Brain 4,000cm ²
/ g Semi-water gypsum; Central Glass Co., Ltd., Brain 4,000 cm ²
/ g Alumina cement; Denki Kagaku Co., Ltd. product name "High Alumina Cement" CaO 25.4%, Al ₂ O ₃ 73.5% Aggregate 6; JIS No. 6 silica sand, Ube Sand Industry Co., Ltd. product name "Ube silica sand" As can be seen from Table-1, when using anhydrous cement gypsum / alumina cement with a weight ratio of anhydrous gypsum of 0.1 to 5 and a rapid hardening material made of alumina cement and white cement, it is possible to obtain the necessary and sufficient amount when performing. You can secure the usage time,
Moreover, because of its excellent strength development, the construction period from construction to use can be shortened. Further, in particular, the color of the hardened material is important, and the rapid-hardening material composed of anhydrous gypsum and alumina cement with a weight ratio of anhydrous gypsum / alumina cement of 0.1 to 5 and white cement are white. Excellent as a base material for blended color rapid hardening cement mortar and color polymer cement.

On the other hand, when the conventional rapid hardening cement or quick hardening cement is used, the color of the hardened body becomes gray or greenish gray, so the color of the pigment does not become glossy, and it is suitable for use in blending the pigment. Not preferable. Further, when dihydrated gypsum is used instead of anhydrous gypsum, setting delay is caused and the strength development is very poor, and when semihydrated gypsum is used, the pot life is shortened and workability is deteriorated, which is not preferable.

The rapid-hardening cement composition of the present invention can be widely applied in fields such as civil engineering and construction, including adhesives such as tiles, jointing materials, waterproofing materials, repairing materials and food resistant materials.

Reference Example 2 A predetermined amount of the product name "Calcined Alumina NMA-20" manufactured by Nippon Light Metal Co., Ltd. and the product name "High-purity B-type quick lime" manufactured by Nippon Lime Co., Ltd. was mixed, melted in an electric furnace, and then melted by air during tapping. Was blown away to produce clinker with different mineral composition and crystallization rate. This clinker was crushed by a batch type ball mill to produce alumina cement.

Further, anhydrous gypsum was crushed with a Pont mill to prepare anhydrous gypsum having different particle sizes.

A predetermined amount of the obtained alumina cement and anhydrous gypsum was mixed and mixed with white cement at a ratio shown in Table 2 to prepare a cement composition.

2 parts of Aggregate No. 6 to 100 parts by weight of this cement composition
00 parts by weight was compounded to obtain a mortar composition, and each physical property was measured. The results are shown in Table-2.

The physical properties were measured in accordance with Reference Example 1, and the composition was Experiment No. 1.
-7 was used.

As is clear from Table 2, the alumina cement to be blended with the rapid hardening material is preferably 70% or more of Al ₂ O _{3, and} more preferably 72% or more because the color of the cured product is close to white. From the balance of strength development, 72 to 89% is most preferable. Particularly, those containing a large amount of CaO / Al ₂ O ₃ are preferable because they have a long pot life.

If the crystallization rate of calcium aluminate is small, the pot life tends to be short, and the crystallization rate is preferably 70% or more.

If the particle size of the alumina cement is coarse, the strength development tends to deteriorate, and it is preferable that the grain is 4,000 cm ² / g or more.

4 If the particle size of the anhydrous gypsum to be mixed with the quick-hardening material is coarse, the quick-hardening property tends to deteriorate and strength development tends to deteriorate.
In the present invention, preferably not less than Blaine 3,000 cm ² / g, more preferable because the 4,000 cm ² / g or more is excellent in rapid hardening.

Example 1 100 parts by weight of white cement, 50 parts by weight of a quick hardening material having a weight ratio of anhydrous gypsum / alumina cement of 1 and a polymer admixture shown in Table 3 were blended to prepare a quick hardening cement composition.

To 100 parts by weight of this rapid-hardening cement composition, 200 parts by weight of Aggregate No. 7 and an appropriate amount of water were added and mixed with a mixer to prepare a rapid-hardening cement mortar.

The prepared rapid-hardening cement mortar was applied on a SUS plate so as to have a thickness of 4 mm, aged at 20 ° C and 60% RH for a predetermined time, and the physical properties were measured as follows.

 The test formulation and the results are shown in Table-3.

[Materials used]

Aggregate No. 7: JIS No. 7 silica, product name "Ube silica" manufactured by Ube Sand Industry Co., Ltd. polymer admixture A: EVA emulsion, product name "Denka EVA 83PLE" manufactured by Denki Kagaku Kogyo Co., Ltd. polymer admixture B: acrylic modified emulsion, Denka Kagaku Co., Ltd. product name "Denka NK1000" Polymer admixture C: powdered EVA, Kanebo UNSC "RESYN78-6263" As is clear from Table 3, when the rapid-hardening mortar composition of the present invention is used, a white cured product having particularly excellent curability, no surface cracks and excellent elasticity can be obtained.

The blending ratio of the polymer admixture is preferably in the range of 5 to 200 parts by weight with respect to the total 100 parts by weight of the rapid hardening material and the white cement.

Example 2 Example 1 Table-3 Experiment No. 3-5 The rapid hardening mortar composition was blended with Ube Sand Industry Co., Ltd. "Ube silica sand" JIS No. 5-8 in a predetermined amount as shown in Table-4, and water was added. Was added appropriately and mixed with a mixer to prepare a rapid-hardening mortar.

The rapid-hardening mortar was applied onto a SUS plate so as to have a thickness of 4 mm, and cured at 20 ° C. and 60% RH for a predetermined time, and the curability, surface cracks and elasticity were the same as in Example 3. It was measured. The strength was measured as follows. Table-Results
It is shown in FIG.

[Physical property measurement method] Strength measurement: Kneaded rapid-hardening mortar was cast into a 4x4x16 cm test piece, cured for a predetermined time at 20 ° C and 60% RH, and then the compression strength was measured.

[Materials used]

Aggregate No. 5: JIS No. 5 silica, product name "Ube silica sand" manufactured by Ube Sand Industry Co., Ltd. Aggregate No. 8: JIS No. 8 silica, product name "Ube silica sand" manufactured by Ube Sand Industry Co., Ltd. As is clear from Table 4, the rapid-hardening mortar composition of the present invention is excellent in curability, prevention of surface cracks and elasticity, particularly required and sufficient strength can be obtained in a short time, and the cured product is white and has a pigment content. Most suitable as a colored substrate.

Example 3 A color polymer cement mortar was prepared by mixing the materials shown in Experiment No. 4-5 of Table 2 in Example 2 with a pigment in a predetermined amount as shown in Table 5.

In the production, first, the pigments were each pulverized with a small pot mill until a predetermined Blaine value was obtained and used.

After mixing these pigments, quick-hardening materials and white cement for 30 minutes in a V-type brane, add Aggregate No. 7 and further mix for 15 minutes, and obtain the mixture, polymer admixture and water in a mixer. And kneaded to prepare a color polymer cement mortar.

Color polymer cement mortar was applied on a SUS plate to a thickness of 4 mm and cured at 20 ° C. and 60% RH for 1 day to prepare a cured product.

Water was sprayed on the surface of this cured product, and after leaving it at room temperature for 3 days, the physical properties were measured as follows, and the condition of white sinter was checked. The results are shown in Table-5.

[Physical property measurement method] Color unevenness; applied to a SUS plate of 500 × 500 mm to a thickness of 4 mm,
The color unevenness was visually evaluated.

○: No color unevenness, △: Slightly present, ×; Yes White flower, ○: No white flower, △: Somewhat, ×; Yes [Materials used] Bengal iron; Red, Ishihara Sangyo Co., Ltd., Iron oxide (Fe ₂ O ₃ ) Chromium oxide; green, "Chromium oxide S-" manufactured by Nippon Kagaku Kogyo Co., Ltd.
1 " As is clear from Table 5, the rapid-hardening mortar composition of the present invention has little color unevenness and white sinter as the color polymer cement mortar, and is required in a short time to obtain sufficient strength.

The mixing ratio of the pigment is preferably 100 parts by weight or less, and more preferably 5 to 50 parts by weight from the viewpoint of less color unevenness, with respect to 100 parts by weight of the rapid hardening cement composition.

Further, if the particle size of the pigment is less than 1,000 cm ² / g, color unevenness is likely to occur, and if it exceeds 8,000 cm ² / g, the dispersibility of the pigment during kneading of the mortar is poor, and color unevenness and white fluff are generated, which is not preferable. It is preferably 1,000 to 8,000 cm ² / g, more preferably 2,000 to 6,000 cm ² / g.

〔The invention's effect〕

As described above, when the rapid-hardening cement composition of the present invention is used, the pot life at the time of construction, the curability and the strength developability are excellent,
Since the base material is a quick-hardening white cement, it is suitable for a color mortar in which a pigment is blended, particularly a polymer cement mortar, and is good without color unevenness or white sinter.

Claims (3)

(57) [Claims] 1. A polymer mixture based on 100 parts by weight of a total of 100 parts by weight of a rapid-hardening material, white cement, and anhydrous gypsum-alumina cement having a weight ratio of anhydrous gypsum / alumina cement of 0.1-5. Material 5-200
A quick-hardening cement composition whose main component is parts by weight. 2. A rapid-hardening mortar composition comprising the rapid-hardening cement composition according to claim 1 and an aggregate as main components. 3. The rapid-hardening mortar composition according to claim 2, further comprising a pigment.