JPH0761846A - Highly hydrated active substance, quick setting material for cement and method for accelerating setting and hardening of concrete or mortar - Google Patents

Abstract

(57) [Summary] [Object] The present invention provides a cement quick-setting material that significantly accelerates the setting and hardening of cement paste, mortar and concrete, the main components of which are highly hydrated active substances and mortar and concrete. -To obtain a method for accelerating the setting and hardening of the grate. [Structure] A CaO-ZnO-Al ₂ O ₃ system composition is melted and then rapidly cooled. CaO is 10 to 79% by weight and ZnO is 1 to 30% by weight based on the total amount of CaO, ZnO and Al ₂ O _3. %, Al ₂ O ₃ is 20 to 60% by weight, and the total amount of CaO and ZnO is 40 to 80% by weight.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a highly hydrated active substance used as a quick-setting material for cement, a quick-setting material for cement, and the setting and hardening of concrete or mortar using the quick-setting material for cement. Regarding how to promote.

[0002]

2. Description of the Related Art By mixing an admixture having an excellent hydration activity with cement, the hardening and setting speed of the cement can be adjusted, whereby the initial strength of concrete and mortar can be remarkably increased and the setting can be improved. The time can be extremely shortened. Also, using this, the ceiling of the tunnel,
A so-called spraying method is widely used, in which concrete or mortar is sprayed on the top plate under the abutment.

As a quick-setting material for cement for this purpose, various materials have been conventionally available. The characteristics required as a fluid concrete used for spraying work are that it has good adhesion and little bounce, that the concrete quickly sets and then hardens immediately after adhesion, and that it does not corrode the steel that is the core material. Can be raised.

A large number of known quick-setting cement materials are roughly classified into water glass-based ones, aluminate-based ones, and calcined albite-based ones. However, those mainly composed of water glass have insufficient strength of the concrete after curing and insufficient long-term stability, and also have a large amount of alkali, which may cause alkali pollution.

Further, it has been pointed out that the quick-setting material composed of soda aluminate and soda carbonate has a problem that the setting time and the initial strength are largely changed due to the change of the addition amount and the quality is not stable. There is. Further, it has a high hygroscopicity, a large amount of alkali, and has a problem in long-term stability. Those mainly composed of calcined alum have low adhesion and low initial strength development. In addition, although there is usually no particular problem, there are also quick-setting materials for cement which have a poor quick-setting performance in the severe winter season, and quick-setting materials for cement which have particular problems in developing strength after curing.

[0006]

DISCLOSURE OF THE INVENTION The present invention is directed to a cement quick-setting material which significantly accelerates the setting and hardening of cement paste, mortar and concrete, the main components of which are highly hydrated active substances and mortar and concrete. -To obtain a method for accelerating the setting and hardening of the grate.

[0007]

The present invention is a CaO-Z
The nO-Al ₂ O ₃ composition was melted and then rapidly cooled.
CaO is 10 with respect to the total amount of aO, ZnO and Al ₂ O _3.
˜79 wt%, ZnO is 1 to 30 wt%, Al ₂ O ₃ is 20 to 60 wt%, and the total amount of CaO and ZnO is 40.
~ 80% by weight of highly hydrated active substance (claim 1), Ca
A composition obtained by melting an O—ZnO—Al ₂ O ₃ composition and then rapidly cooling it, and CaO with respect to the total amount of CaO, ZnO, and Al ₂ O _3.
Is 10 to 79% by weight, ZnO is 1 to 30% by weight, Al ₂
Gypsum, lime, alkali carbonate, soda aluminate and aluminum hydroxide for highly hydrated active substances having O ₃ of 20 to 60% by weight and CaO and ZnO of 40 to 80% by weight in total. A quick-setting material for cement in which at least one of the above is mixed (claim 2) CaO-ZnO-Al ₂ O ₃
The system composition was melted and then rapidly cooled. CaO, ZnO and A
10 to 79% by weight of CaO with respect to the total amount of l ₂ O ₃ , Z
nO is 1 to 30% by weight, Al ₂ O ₃ is 20 to 60% by weight
And the total amount of CaO and ZnO is 40 to 80% by weight for the highly hydrated active substance,
For 100 parts by weight of the total amount of aO, ZnO and Al ₂ O ₃ ,
Gypsum 5 to 35 parts by weight, lime 5 to 40 parts by weight, alkali carbonate 5 to 50 parts by weight, sodium aluminate 10 to 10 parts by weight.
Quick-setting material for cement added with 50 parts by weight (claim 3), C
An aO-ZnO-Al ₂ O ₃ composition was melted and then rapidly cooled, and Ca was added to the total amount of CaO, ZnO, and Al ₂ O _3.
O is 10 to 79% by weight, ZnO is 1 to 30% by weight, Al
In ₂ O ₃ is 20 to 60 wt%, and CaO and the total content of ZnO is to Kazu Takamizu active substance is 40 to 80 wt%, CaO, ZnO and Al ₂ O in the Kazu Takamizu active substance 5 to 35 parts by weight of gypsum, 5 to 40 parts by weight of lime, 5 to 50 parts by weight of alkali carbonate, and 100 parts by weight of the total amount of ₃ ;
When kneading a rapid-setting cement material (claim 4), concrete or mortar containing 10 to 50 parts by weight of sodium aluminate and 25 parts by weight or less of aluminum hydroxide,
A method for accelerating the setting and hardening of concrete or mortar, which comprises adding 2 to 25% by weight to the cement of the quick setting material for cement according to any one of claims 2 to 4 (claim 5). , CaO-BaO-Al ₂ O ₃ composition was melted and then rapidly cooled.
10 to 79% by weight of CaO with respect to the total amount of ₂ O ₃ , Ba
1 to 30 wt% O, 20 to 60 wt% Al ₂ O ₃
And a highly hydrated active substance having a total content of CaO and BaO of 40 to 80% by weight (claim 6), CaO-BaO-Al.
₂ O ₃ composition is melted and quenched, and CaO and Ba
10 to 79% by weight of CaO, 1 to 30% by weight of BaO, and 20 to 60% of Al ₂ O ₃ with respect to the total amount of O and Al ₂ O _3.
At least one of gypsum, lime, alkali carbonate, soda aluminate and aluminum hydroxide with respect to the highly hydrated active substance having a total content of CaO and BaO of 40 to 80% by weight. A rapid binding material for cement (Claim 7), which is mixed with CaO-BaO-Al ₂ O ₃ composition, is melted and then rapidly cooled, and CaO is 10 with respect to the total amount of CaO, BaO and Al ₂ O _3. ~ 79 wt%, BaO 1-30
% By weight, 20-60% by weight of Al ₂ O ₃ , and CaO
For a highly hydrated active substance having a total content of 40 to 80% by weight and BaO, 5 gypsum was added to 100 parts by weight of the total amount of CaO, BaO and Al ₂ O ₃ in the highly hydrated active substance. ~ 3
5 parts by weight, 5 to 40 parts by weight of lime, 5 to 5 parts of alkali carbonate
50 parts by weight, 10 to 50 parts by weight of sodium aluminate, a quick-setting cement material (claim 8), CaO-BaO-
Which was quenched after melting the Al ₂ O ₃ based compositions, CaO against the total amount of CaO and BaO, Al ₂ O ₃ is 10 to 79
% By weight, 1 to 30% by weight of BaO, 20 to 20% of Al ₂ O _3.
60 wt% and the total amount of CaO and BaO is 40-80
To 100% by weight of the total amount of CaO, BaO and Al ₂ O ₃ in the highly hydrated active substance, the gypsum is 5 to 35 parts by weight and the lime is 5 to 5% by weight. 40 parts by weight, 5 to 50 parts by weight of alkali carbonate, sodium aluminate
10. When kneading a quick-setting admixture for cement (claim 9) containing 10 to 50 parts by weight of da and 25 parts by weight or less of aluminum hydroxide, and concrete or mortar, the method according to claim 7 or 9. The method for accelerating the setting and hardening of concrete or mortar is characterized by adding 2 to 25% by weight of the above-mentioned quick-setting material for cement to the cement (claim 10).

In the above inventions, claims 1 to 5 use a CaO-ZaO-Al ₂ O ₃ composition in common as a highly hydrated active substance, whereas claims 6 to 10 highly hydrate. The difference is that a CaO—BaO—Al ₂ O ₃ based composition is used as the active substance, and the other points are the same.

First, the highly hydrated active substance according to claim 1 is CaO.
-ZnO-Al ₂ O ₃ composition was melted and quenched, and CaO, ZnO, and Al ₂ O ₃ were mixed with Ca.
O is 10 to 79% by weight, ZnO is 1 to 30% by weight, Al
₂ O ₃ is 20 to 60% by weight, and the total amount of CaO and ZnO is 40 to 80% by weight. This highly hydrated active substance is used as a minor component in addition to Na ₂ O, K ₂ , O,
MgO, may contain about 5% and Fe ₂ O _3.

This highly hydrated active substance is CaO, Al ₂ O.
₃ , obtained by melting the ZnO raw material in an electric furnace or the like and then rapidly cooling it to room temperature. It is preferable that the raw material is completely melted and then rapidly cooled to become amorphous. The faster the quenching rate, the more preferable. For example, cooling is performed at 300 to 1000 ° C./sec. It is preferable that the whole that is rapidly cooled after melting is amorphous, but some may contain a crystal. This highly hydrated active substance is mainly used as a main component of a quick-setting admixture for cement, but is also used as a fast-acting admixture for cement mortar and concrete together with other components. In such applications, the amount added to cement will vary depending on the type and amount of the additive used in combination, but
It is 40%, preferably 5 to 25%.

In claim 6, BaO is used in place of ZnO in the invention of claim 1, but the use and manufacturing method thereof are the same as in claim 1. With these inventions,
When ZnO or BaO exceeds 30% by weight, the hydration activity decreases. Further, when the content of ZnO or BaO is less than 1% by weight, the CaO-Al ₂ O ₃ based composition has sufficient Ca ²⁺ , A
The l ³⁺ ion cannot be eluted and an excellent quick-setting property cannot be obtained. A more preferable compounding ratio of ZnO or BaO is 5 to 15% by weight.

Further, CaO is 10 to 79% by weight. Further, Al ₂ O ₃ is 20 to 60% by weight. CaO
And Al ₂ O ₃ is in these ranges, the required C
Elution of a ²⁺ and Al ³⁺ ions occurs, and the hydration activity necessary for exhibiting rapid binding property can be obtained. Also, CaO is 79%
If it exceeds 5% by weight, quick lime is generated in the melt to increase the heat of hydration, but the quick-setting property decreases.

A feature of the above invention is that a composition obtained by adding ZnO or BaO to CaO-Al ₂ O ₃ facilitates the elution of Ca ²⁺ and Al ³⁺ ions necessary for obtaining quick-setting properties. In addition to the above requirements, the total amount of CaO and BaO or ZnO must be 40 to 80% by weight. This is 4
If it is less than 0% by weight, the hydration activity of calcium aluminate is lowered and the quick setting property is lowered. The higher the total amount of CaO and ZnO or the higher total amount of CaO and BaO, the more excellent the hydration activity is. However, if the total amount is too large, the compounding ratio of Al ₂ O ₃ decreases, so the upper limit is 80% by weight. The lower limit is 40% by weight. The total amount of CaO and ZnO, or Ca
A more preferable range of the total amount of O and BaO is 60 to 80% by weight.

The highly hydrated active substance of Zn or Ba-added calcium aluminate thus obtained has remarkably remarkable hydration activity as compared with molten calcium aluminate and sintered calcium aluminate, as shown in the experimental examples described later. However, in order to use it as a quick-setting material for cement, at least one of predetermined gypsum, lime, alkali carbonate, sodium aluminate, and aluminum hydroxide is further added. The second aspect is the addition of these auxiliary materials.

A seventh aspect of the present invention is the Z of the second aspect of the invention.
BaO is used instead of nO. The other points are the same as in claim 2. Claim 3 specifies the amounts of gypsum, lime, alkali carbonate, and sodium aluminate added to the highly hydrated active substance.

Gypsum balances the formation of ethrin guide and monosulfate hydrate, water-insoluble type II anhydrous gypsum being most preferred. The addition amount varies depending on the use temperature, but is 5 to 35 with respect to 100 parts by weight of the total amount of CaO, ZnO, and Al ₂ O ₃ (hereinafter referred to as the “total amount of three components”) in the above-mentioned highly hydrated active substance. The range is parts by weight. When the working temperature is 5 to 10 ° C, the compounding ratio of gypsum is preferably 5 to 10 parts by weight. In the case of using at low temperature, if it is less than 5 parts by weight or more than 10 parts by weight, the amount of ethrin guide produced is low and the strength development may be low, so the above range is preferable. When the use temperature is 10 to 30 ° C, gypsum shows 10 to 20 parts by weight, and when the use temperature is 30 ° C or higher, the gypsum shows 20 to 35 parts by weight, and further shows quick setting property.

Lime is substantially 80% or more of CaO or Ca.
It becomes (OH) and plays an important role in controlling the production amount and production rate of the ethrin guide. The compounding ratio is in the range of 5 to 40 parts by weight based on 100 parts by weight of the total amount of the above three components. When it exceeds 40 parts by weight, the strength development decreases, and when it is less than 5 parts by weight, sufficient quick-setting property is not exhibited. When quick lime is used as the lime, it is hard-cooked to reduce the elution of Ca ²⁺ ions as much as possible, which shows good performance.

The alkali metal carbonate is an auxiliary material such as lithium carbonate, soda carbonate, calcium carbonate, etc., which plays a complementary role in imparting quick setting property, and is 5 parts per 100 parts by weight of the total amount of the three components. To 50 parts by weight. If this is less than 5 parts by weight, the elution of Al ₂ O ₃ ions cannot be enhanced,
It does not show sufficient quick-setting property. If it exceeds 50 parts by weight, long-term strength and durability are deteriorated, which is not preferable.

Further, 10 to 50 parts by weight of sodium aluminate is added to 100 parts by weight of the total amount of the three components. If it is less than 5 parts by weight, the quick-setting property will be deteriorated, and if it exceeds 50 parts by weight, the durability will be deteriorated.

The eighth aspect of the present invention is the Z of the third aspect of the invention.
BaO is used instead of nO. The other points are the same as in claim 3. A fourth aspect of the invention is that the aluminum hydroxide is added to the invention of the third aspect in an amount of 25 parts by weight or less. This can further improve the quick-setting property. Aluminum hydroxide does not require much soluble aluminum when the compounding ratio of sodium aluminate is large.
When the blending ratio of soda aluminate is 15% by weight or less,
Good results are obtained when used. The compounding ratio of aluminum hydroxide is 10 when the working temperature is 20 ° C or lower.
It is preferably 20 parts by weight and less than 10 parts by weight when the temperature is 20 ° C. or higher.

A ninth aspect of the invention is the Z of the fourth aspect of the invention.
BaO is used instead of nO. The other points are the same as in claim 4. The invention of claim 5 is such that when the concrete or mortar is kneaded, 2 to 25 parts by weight of the quick-setting cement for cement according to any one of claims 2 to 4 is added to the cement.

That is, the quick-setting material according to any one of claims 2 to 4 is added to the cement or the mortar during the kneading of the concrete or the mortar without being premixed with the cement, and the concrete or the mortar is condensed. This is a method of promoting curing. This method is usually carried out by spraying concrete or mortar, but the present invention uses the quick-setting material used in such a case as described in any one of claims 2 to 4 and cement. 2 to 25% by weight is added. If this is less than 2% by weight, condensation
The curing speed is slow and it is not sufficient for spraying work, and if it exceeds 25% by weight, the long-term strength is lowered and the cost is increased, which is not preferable. In the tenth aspect, BaO is used in place of the ZnO of the fifth aspect of the invention. The other points are the same as in claim 5.

[0023]

【Example】

(Examples 1 to 17, Comparative Examples 1 to 6) Various Ca shown in Table 1
The O—ZnO—Al ₂ O ₃ composition was heated at 1800 ° C. in an electric furnace.
Completely melted, and then air-cooled to normal temperature. The calorific value of hydration of this product was measured using a micro calorimeter, and the cumulative calorific value of hydration up to 1 hour was measured. The results are shown in Table 1.
In Table 1, compositions outside the scope of the present invention and calcium aluminate without ZnO are shown as Comparative Examples 1 to 6.

[0024]

[Table 1]

As can be seen from Table 1, the Zn-added calcium aluminate used in the present invention has an extremely high heat value of hydration up to 1 hour as compared with those without Zn and those outside the scope of the present invention. It is recognized that the hydration activity is large and remarkable. (Examples 18 to 34, Comparative Examples 7 to 9) Various Cs shown in Table 2
The aO-BaO-Al ₂ O ₃ composition, totally melted in the same manner as in Example 1 to 17, which was then the room temperature cooled air.
The calorific value of hydration of this product was measured in the same manner, and the cumulative calorific value of hydration up to 1 hour was measured. The results are shown in Table 2. In Table 2, those outside the scope of the present invention are shown as Comparative Examples 7-9.

[0026]

[Table 2]

As can be seen from Table 2, the barium-added calcium aluminate used in the present invention has a very large hydration calorific value up to 1 hour and a remarkable hydration activity as compared with those of the comparative examples. To be (Examples 35 to 82, Comparative Examples 10 to 18) Above Example 1
~ 17 and various CaO-Zn obtained in 18-34
O-Al ₂ O ₃ based composition or CaO-BaO-Al ₂
A highly hydrated active substance of the O ₃ -based composition was used, and Table 3 to Table 6 were used.
Anhydrous gypsum, quick lime, aluminum hydroxide, soda carbonate and soda aluminate were mixed in the proportions shown in Table 1 to prepare a quick-setting material. These are shown in Tables 3-6.

To this quick-setting material, 260 kg of cement, 520 g of Toyoura standard sand, and 18.2 g of the above-mentioned quick-setting material (7% based on cement) were mixed, and this was put into a cylindrical plastic container having a diameter of 10 cm and a height of 15 cm. Fill it with 168 ml of water (water ratio 65
%), And immediately with a stirrer with impeller at 1000 rpm,
The mixture was kneaded for about 8 seconds, and then tapped around the container to make the flat surface smooth and allowed to stand.

From the time when the above water was added, Table 7 to Table 10
When the time shown in (1) has elapsed, the resistance value (× 40 ps) when the 1/40 in ² proctor needle penetrates 1 in depth
i) was measured.

The compressive strength of this mortar is
The measurement was performed on 3 and 28 days. These results are shown in Tables 7 to 10.
It was shown to. In these tables, quick-setting materials obtained in the same manner by using Comparative Examples 1 to 9 of the highly hydrated active substances shown in Tables 1 and 2 are shown as Comparative Examples 10 to 18.

Tables 11 and 12 show the case where 10.4 g (4% of cement) of the same quick-setting material as above was mixed with the same cement and sand as above. Comparative examples thereof are shown in Comparative Examples 19 and 20 in the table.

[0032]

[Table 3]

[0033]

[Table 4]

[0034]

[Table 5]

[0035]

[Table 6]

[0036]

[Table 7]

[0037]

[Table 8]

[0038]

[Table 9]

[0039]

[Table 10]

[0040]

[Table 11]

[0041]

[Table 12]

In Examples 35 to 39 of Table 3, any one of gypsum, lime, aluminum hydroxide, soda carbonate and soda aluminate was added to the highly hydrated active substance shown in Table 1. This is an example of a quick-setting material for cement. Example 40
~ 49 is gypsum per 100 parts by weight of highly hydrated active substance,
This is an example of a quick-setting material for cement, which is added by using lime, soda carbonate, and soda aluminate together. In this case, gypsum is 5 to 35 parts by weight with respect to 100 parts by weight of the highly hydrated active substance,
5 to 40 parts by weight for lime, 5 to 50 parts by weight for soda carbonate, 10 to 5 for soda aluminate.
An example of compounding at 0 parts by weight is shown.

Examples 50 to 55 in Table 4 are examples in which all of the above-mentioned gypsum, lime, soda carbonate, soda aluminate and aluminum hydroxide were added together to the highly hydrated active substance shown in Table 1. Is shown. Examples 56 to 58 use one or more of gypsum, lime, aluminum hydroxide and soda carbonate. Comparative Examples 10 to 15 shown in the table are Comparative Examples 1 to 6 as highly hydration active substances.
It is an example of using the one.

In Examples 59 to 63 of Table 5, any one of gypsum, lime, aluminum hydroxide, soda carbonate and soda aluminate was added to the highly hydrated active substance shown in Table 2. This is an example of a quick-setting material for cement. Examples 64-7
3 is gypsum, lime, carbonate soda for highly hydrated substances
This is an example of a quick-setting material for cement, which was added by using both aluminum and sodium aluminate. In this case, 5 to 35 parts by weight of gypsum, 5 to 40 parts by weight of lime, 5 to 50 parts by weight of soda carbonate, and 5 to 50 parts by weight of soda aluminate are added to 100 parts by weight of the highly hydrated active substance. Cases of 10 to 50 parts by weight are shown.

Examples 74 to 79 in Table 6 show examples in which gypsum, lime, soda carbonate, soda aluminate, and aluminum hydroxide were added together to the highly hydrated active substance shown in Table 2. It is a thing. Examples 80 to 82 use one type or three or more types of gypsum, lime, aluminum hydroxide and soda carbonate. Comparative Example 1 shown in the table
3 to 18 are cases in which those of Comparative Examples 4 to 9 were used as the highly hydrated active substance.

In Tables 7 to 10, after adding water to the various raw material mixtures shown in each table of adding 7% of quick-setting material, when the time shown in Tables 7 to 10 has elapsed, the proctor needle penetrates into this. The resistance value at that time was measured and shown.
The compressive strength of 3 days and 28 days was shown. The comparative example is also shown in the same manner. Tables 11 and 12 show examples in which 4% of a quick-setting material similar to the above was blended.

As can be seen from the table, all the products of the present invention show a good quick-setting property at room temperature of 20 ° C. In particular, a good quick-setting property is shown in the first 1 to 3 minutes. It can be seen that a good effect can be expected even at a low temperature of 5 ° C.
Further, it can be seen that the compression strength also shows a high value. On the other hand, the comparative examples are all inferior in quick setting property to the present invention. In particular, it can be seen that the initial quick setting property for 1 to 3 minutes is poor.

[0048]

According to the present invention, ZnO or BaO is added to the CaO-Al ₂ O ₃ system so as to impart the hydration activity of calcium aluminate, and Ca ²⁺ , which is necessary for obtaining the quick-setting property of cement, This is a quick setting material for cement which is excellent in quick setting property and initial and long-term strength development properties by controlling elution of Al ³⁺ ions.

[0049]

[Effect] The quick-setting material of the present invention exhibits excellent quick-setting properties as described above, and also exhibits good early and long-term strength, and can be said to be a quick-setting material that has solved the problems so far.
Therefore, when this is used for spraying a conventional concrete or mortar, the construction can be reliably performed and a stronger structure can be formed.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI technical display location // C04B 103: 10 (72) Inventor Tadakuni Arimoto 2-4-2 Daisaku Sakura, Chiba Prefecture Central Research Laboratory, Onoda Cement Co., Ltd. (72) Takayoshi Okamura, 2-4-2 Daisaku Sakura, Chiba Prefecture, Central Research Laboratory, Onoda Cement Co., Ltd.

Claims (10)

[Claims] 1. A CaO—ZnO—Al ₂ O ₃ composition melted and then rapidly cooled, wherein CaO is 10 to 79% by weight and ZnO is 1 to 1% by weight based on the total amount of CaO, ZnO and Al ₂ O ₃ .
30% by weight, 20 to 60% by weight of Al ₂ O ₃ , and C
A highly hydrated active substance in which the total amount of aO and ZnO is 40 to 80% by weight. 2. A CaO—ZnO—Al ₂ O ₃ system composition melted and rapidly cooled, wherein CaO is 10 to 79% by weight and ZnO is 1 to 1% by weight based on the total amount of CaO, ZnO and Al ₂ O ₃ .
30% by weight, 20 to 60% by weight of Al ₂ O ₃ , and C
For cement in which at least one of gypsum, lime, alkali carbonate, sodium aluminate and aluminum hydroxide is mixed with a highly hydrated active substance having a total content of aO and ZnO of 40 to 80% by weight. Quick binding material. 3. A CaO—ZnO—Al ₂ O ₃ composition melted and then rapidly cooled, wherein CaO is 10 to 79% by weight and ZnO is 1 to 100% by weight based on the total amount of CaO, ZnO and Al ₂ O ₃ .
30% by weight, 20 to 60% by weight of Al ₂ O ₃ , and C
CaO and Zn in the highly hydrated active substance with respect to the highly hydrated active substance in which the total amount of aO and ZnO is 40 to 80% by weight.
5 gypsum is added to 100 parts by weight of O and Al ₂ O ₃ in total.
~ 35 parts by weight, 5-40 parts by weight of lime, 5-50 parts by weight of alkali carbonate, 10-50 parts by weight of soda aluminate, a quick-setting cement material. 4. A CaO—ZnO—Al ₂ O ₃ system composition melted and then rapidly cooled, wherein CaO is 10 to 79% by weight and ZnO is 1 to 1% by weight based on the total amount of CaO, ZnO and Al ₂ O ₃ .
30% by weight, 20 to 60% by weight of Al ₂ O ₃ , and C
CaO and Zn in the highly hydrated active substance with respect to the highly hydrated active substance in which the total amount of aO and ZnO is 40 to 80% by weight.
5 gypsum is added to 100 parts by weight of O and Al ₂ O ₃ in total.
-35 parts by weight, 5-40 parts by weight of lime, 5-50 parts by weight of alkali carbonate, 10-50 parts by weight of soda aluminate, and 25 parts by weight or less of aluminum hydroxide, a quick-setting cement material. 5. A concrete characterized in that when the concrete or mortar is kneaded, the quick-setting admixture for cement according to any one of claims 2 to 4 is added in an amount of 2 to 25% by weight with respect to the cement. A method of accelerating the setting and hardening of resin or mortar. 6. A CaO—BaO—Al ₂ O ₃ composition is melted and then rapidly cooled, wherein CaO is 10 to 79% by weight and BaO is 1 to 1 based on the total amount of CaO, BaO and Al ₂ O ₃ .
30% by weight, 20 to 60% by weight of Al ₂ O ₃ , and C
A highly hydrated active substance in which the total amount of aO and BaO is 40 to 80% by weight. 7. A CaO—BaO—Al ₂ O ₃ composition is melted and then rapidly cooled, wherein CaO is 10 to 79 wt% and BaO is 1 to 1 based on the total amount of CaO, BaO and Al ₂ O ₃ .
30% by weight, 20 to 60% by weight of Al ₂ O ₃ , and C
For cement in which at least one of gypsum, lime, alkali carbonate, sodium aluminate and aluminum hydroxide is mixed with a highly hydrated active substance having a total content of aO and BaO of 40 to 80% by weight. Quick binding material. 8. A CaO—BaO—Al ₂ O ₃ composition is melted and then rapidly cooled, wherein CaO is 10 to 79% by weight and BaO is 1 to 1 based on the total amount of CaO, BaO and Al ₂ O ₃ .
30% by weight, 20 to 60% by weight of Al ₂ O ₃ , and C
For the highly hydrated active substance in which the total amount of aO and BaO is 40 to 80% by weight, CaO and Ba in the highly hydrated active substance are contained.
5 gypsum is added to 100 parts by weight of O and Al ₂ O ₃ in total.
~ 35 parts by weight, 5-40 parts by weight of lime, 5-50 parts by weight of alkali carbonate, 10-50 parts by weight of soda aluminate, a quick-setting cement material. 9. A CaO—BaO—Al ₂ O ₃ composition is melted and then rapidly cooled, wherein CaO is 10 to 79% by weight and BaO is 1 to 1 based on the total amount of CaO, BaO and Al ₂ O ₃ .
30% by weight, 20 to 60% by weight of Al ₂ O ₃ , and C
For the highly hydrated active substance in which the total amount of aO and BaO is 40 to 80% by weight, CaO and Ba in the highly hydrated active substance are contained.
5 gypsum is added to 100 parts by weight of O and Al ₂ O ₃ in total.
-35 parts by weight, 5-40 parts by weight of lime, 5-50 parts by weight of alkali carbonate, 10-50 parts by weight of soda aluminate, and 25 parts by weight or less of aluminum hydroxide, a quick-setting cement material. 10. A concrete characterized in that when the concrete or mortar is kneaded, the rapid-setting cement for cement according to any one of claims 7 to 9 is added in an amount of 2 to 25% by weight with respect to the cement. A method of accelerating the setting and hardening of resin or mortar.