JP2011132111A - Hydraulic composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydraulic composition which, even when made from a raw material such as industrial wastes, general wastes, or surplus construction soil, can produce mortar or concrete having reduced heat of hydration, excellent fluidity, and good long-term strength development. <P>SOLUTION: The hydraulic composition comprises a ground product from a fired product having a hydraulic modulus (H.M.) of 1.8-2.3, a silica modulus (S.M.) of 1.0-2.4, an iron modulus (I.M.) of 1.3-2.8, and a 3CaO-Al<SB>2</SB>O<SB>3</SB>content of 9.0-18.0 mass%, and having a B<SB>2</SB>O<SB>3</SB>content of 0.01 mass% or more and gypsum. It is desirable that the fired product satisfies the relationship: 0.0017X-0.005≤Y≤0.0667X-0.2 between the 3CaO-Al<SB>2</SB>O<SB>3</SB>content X (mass%) and B<SB>2</SB>O<SB>3</SB>content Y (mass%) during the firing. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a hydraulic composition that can reduce the heat of hydration and can produce mortar and concrete having excellent fluidity.

  In Japan, industrial waste, general waste, etc. are rapidly increasing with economic growth and population concentration in urban areas. Conventionally, most of the above waste has been reduced to a tenth volume by incineration and landfilled. Has become an urgent issue. In order to cope with this problem, the cement industry has conventionally recycled industrial waste, general waste, and the like as cement raw materials (Patent Documents 1 and 2).

JP-A 56-120552 JP 2000-281395 A

However, when a large amount of waste is used as a cement raw material, the amount of 3CaO · Al ₂ O _{3 in} the cement increases, resulting in a problem that the heat of hydration of the cement increases. Moreover, when manufacturing mortar and concrete using such a cement and an admixture, there also existed a problem that a mortar flow and slump became small and a flow loss and slump loss also became large. Furthermore, since the amount of calcium silicate is reduced, the strength development property at long-term material age may be lowered.

  Therefore, in the present invention, even if the raw material is industrial waste, general waste or construction generated soil, the heat of hydration can be reduced, the fluidity is excellent, and the long-term strength development is A hydraulic composition capable of producing good mortar and concrete is provided.

As a result of intensive studies in view of such circumstances, the present inventors have a specific hydraulic modulus, silicic acid rate and iron rate, and a specific amount of 3CaO · Al ₂ O ₃ and B ₂ O ₃ . It has been found that by combining the pulverized product of the fired product and gypsum, the heat of hydration of the hydraulic composition can be reduced, the fluidity is excellent, and the long-term strength development is also improved. The invention has been completed.
That is, the present invention has a hydraulic modulus (HM) of 1.8 to 2.3, a silicic acid rate (SM) of 1.0 to 2.4, an iron rate (IM) of 1.3 to 2.8, and a 3CaO · Al ₂ O ₃ content of 9.0 to The present invention provides a hydraulic composition characterized by containing a ground product of 18.0% by mass and a baked product having a B ₂ O ₃ content of 0.01% by mass or more and gypsum.

The hydraulic composition of the present invention can reduce the heat of hydration, can produce mortar and concrete having excellent fluidity and good long-term strength development.
Further, in the hydraulic composition of the present invention, one or more selected from industrial waste, general waste and construction generated soil can be used as a raw material, which can contribute to promotion of effective use of waste. it can.

Hereinafter, the present invention will be described in detail.
The fired product used in the present invention has a hydraulic modulus (HM) of 1.8 to 2.3, a silicic acid rate (SM) of 1.0 to 2.4, and an iron rate (IM) of 1.3 to 2.8.
When the hydraulic modulus (HM) of the fired product decreases, 3CaO · Al ₂ O ₃ (hereinafter abbreviated as C ₃ A) and 4CaO · Al ₂ O ₃ · Fe ₂ O ₃ (hereinafter referred to as C ₄ ) in the fired product are reduced. The abundance of (AF) is increased, the heat of hydration of the hydraulic composition is increased, and the fluidity of mortar and concrete tends to be decreased. Moreover, it becomes difficult to fire the fired product. On the other hand, when the hydraulic modulus (HM) is increased, the initial strength of mortar and concrete is improved, but the elongation of long-term strength tends to be dull. Therefore, the hydraulic modulus (HM) is preferably 1.8 to 2.3, more preferably 2.0 to 2.2.
When the silicic acid ratio (SM) of the fired product decreases, the content of C ₃ A and C ₄ AF in the fired product increases, the heat of hydration of the hydraulic composition increases, and the flow of mortar and concrete Tend to decrease. Moreover, it becomes difficult to fire the fired product. On the other hand, an increase in the silicic acid ratio (SM) is preferable in terms of fluidity of mortar and concrete, but the contents of C ₃ A and C ₄ AF are reduced, making it difficult to fire the fired product. In addition, it becomes difficult to use a large amount of waste as a cement raw material. Therefore, the silicic acid ratio (SM) is preferably 1.0 to 2.4, more preferably 1.05 to 2.3, and particularly preferably 1.1 to 2.2.
When the iron ratio (IM) of the fired product is small, it is preferable in terms of fluidity of mortar and concrete, but the grindability of the fired product is lowered. On the other hand, when the iron ratio (IM) increases, the content of C ₃ A in the fired product increases, the heat of hydration of the hydraulic composition increases, and the fluidity of mortar and concrete tends to decrease. . Therefore, the iron ratio (IM) is preferably 1.3 to 2.8, more preferably 1.5 to 2.6, and particularly preferably 1.6 to 2.4.

The fired product used in the present invention has a C ₃ A content of 9.0 to 18.0% by mass.
When the C ₃ A content is small, it is preferable in terms of fluidity of mortar and concrete, but it becomes difficult to use a large amount of waste as a cement raw material. On the other hand, when the C ₃ A content increases, the heat of hydration of the hydraulic composition increases and the fluidity of mortar and concrete tends to decrease. Therefore, the C ₃ A content is preferably 9.0 to 17.0% by mass, more preferably 10.0 to 16.0% by mass, and particularly preferably 11.0 to 15.0% by mass.
In the present invention, the C ₃ A content is a value calculated by the Borg equation.

The fired product used in the present invention has a B ₂ O ₃ content of 0.01% by mass or more.
When the B ₂ O ₃ content decreases, the heat of hydration of the hydraulic composition increases, and the fluidity of mortar and concrete tends to decrease. On the other hand, when the B ₂ O ₃ content is increased, the setting of the mortar and concrete is delayed and the initial strength tends to decrease. Therefore, the B ₂ O ₃ content is preferably 0.01 to 1.0% by mass, more preferably 0.02 to 0.8% by mass.

In the fired product used in the present invention, the content of 3CaO · Al ₂ O ₃ in the fired product X (from the heat of hydration of the hydraulic composition, the setting of mortar and concrete, the fluidity and strength development, etc. (Mass%) and the B ₂ O ₃ content Y (mass%) preferably satisfy 0.0017X−0.005 ≦ Y ≦ 0.0667X−0.2.

The fired product used in the present invention can be produced by firing at least one selected from industrial waste, general waste, and construction generated soil. Industrial wastes include, for example, coal ash; raw sludge, sewage sludge, purified water sludge, construction sludge, various types of sludge such as iron sludge; boring waste, various incineration ash, foundry sand, rock wool, waste glass, blast furnace secondary ash General wastes include, for example, sewage sludge dry powder, municipal waste incinerated ash, shells, and the like. Examples of construction generated soil include soil and residual soil generated from construction sites and construction sites, and waste soil.
As raw materials for B ₂ O ₃ , natural raw materials such as borolith and borax and waste such as waste borosilicate glass can be used.
Also, general Portland cement clinker raw materials, for example, CaO raw materials such as limestone, quicklime and slaked lime, SiO ₂ raw materials such as silica and clay, Al ₂ O ₃ raw materials such as clay, Fe ₂ O ₃ such as iron cake and iron cake Raw materials can also be used.

The above raw materials are mixed with predetermined HM, SM, and IM so as to have predetermined C ₃ A content and B ₂ O ₃ content, and preferably fired at 1200 to 1550 ° C. to produce a fired product. Is done. A more preferable firing temperature is 1350 to 1450 ° C.
The method of mixing each raw material is not particularly limited, and may be performed with a conventional apparatus or the like.
Moreover, the apparatus used for baking is not specifically limited, For example, a rotary kiln etc. can be used. When firing in a rotary kiln, alternative fuel wastes such as waste oil, waste tires, waste plastics, etc. can be used.
In the fired product used in the present invention, the amount of free lime is preferably 0.5 to 1.0% by mass from the viewpoint of improving the strength development of mortar and concrete, particularly the initial strength development.

The hydraulic composition of the present invention contains the pulverized product of the fired product and gypsum. As the gypsum, dihydrate gypsum, α-type or β-type hemihydrate gypsum, anhydrous gypsum and the like can be used alone or in combination of two or more.
In the present invention, the proportion of SO ₃ in dihydrate gypsum and hemihydrate gypsum relative to total SO ₃ in the hydraulic composition is preferably 40% by mass or more. If the ratio of SO ₃ in dihydric gypsum and hemihydrate gypsum to the total SO ₃ in the hydraulic composition is less than 40% by mass, the heat of hydration of the hydraulic composition increases, and the fluidity of the mortar and concrete increases. Since it falls, it is not preferable. The proportion of SO ₃ in dihydrate gypsum and hemihydrate gypsum relative to total SO ₃ in the hydraulic composition is preferably 50 to 95% by mass from the viewpoint of improving the fluidity of mortar and concrete and compatibility with water reducing agents. 60 to 90% by mass is more preferable.

In the present invention, the ratio of hemihydrate gypsum to the total amount of dihydrate gypsum and hemihydrate gypsum in the hydraulic composition is preferably 30% by mass or more in terms of SO ₃ . If the ratio of hemihydrate gypsum to the total amount of dihydrate gypsum and hemihydrate gypsum is less than 30% by mass in terms of SO ₃ , the heat of hydration of the hydraulic composition will increase, and the setting time of mortar and concrete will be extremely short. This is not preferable for reasons such as low fluidity and reduced dimensional stability of the cured product. The ratio of hemihydrate gypsum to the total amount of 2-hydrate gypsum and hemihydrate gypsum is preferably 40 to 90% by mass from the viewpoint of reducing heat of hydration and improving fluidity of mortar and concrete.
The quantification of dihydrate gypsum and hemihydrate gypsum can be performed by thermal analysis (thermogravimetric measurement or the like) using a sample container described in JP-A-62-242035. Further, the quantification of total SO ₃ in the hydraulic composition can be performed by chemical analysis.

The hydraulic composition of the present invention can contain one or more inorganic powders selected from blast furnace slag powder, fly ash, limestone powder, and quartzite powder. By containing these inorganic powders, it is possible to further reduce heat of hydration and improve fluidity. As the inorganic powder, blast furnace slag powder, a combination of blast furnace slag powder and limestone powder is used because of the fluidity and strength development of mortar and concrete, as well as the effect of suppressing alkali-aggregate reaction and sulfate resistance. It is preferable.
In the present invention, the amount of inorganic powder in the hydraulic composition varies depending on the type of the inorganic powder. For example, in the case of blast furnace slag powder, the flowability and strength development of mortar and concrete, further the inhibitory effect of alkali-aggregate reaction, sulfate resistance, etc. It is preferable that it is -150 mass parts, and it is more preferable that it is 0.5-100 mass parts. If it is a fly ash, a limestone powder, or a quartzite powder, it is preferable that it is 0.1-100 mass parts with respect to 100 mass parts of pulverized products of a baked product, and it is more preferable that it is 0.5-80 mass parts. In addition, when using a combination of blast furnace slag powder and limestone powder, the blast furnace slag powder is 0.1 to 150 parts by mass with respect to 100 parts by mass of the pulverized product of the fired product because of fluidity and strength development of mortar and concrete. The limestone powder is preferably 0.1 to 20 parts by mass with respect to 100 parts by mass of the pulverized product of the fired product.

In the present invention, the amount of gypsum in the hydraulic composition is 1 to 5 parts by mass in terms of SO _{3 with} respect to 100 parts by mass of the pulverized product of the fired product from the fluidity and strength development of mortar and concrete. It is preferable that it is 1.5-3.5 mass parts.

The manufacturing method of the hydraulic composition of this invention is demonstrated.
As a method for producing a hydraulic composition comprising a pulverized product of a fired product and gypsum, for example,
(1) A method of pulverizing the fired product and gypsum simultaneously
(2) A method of pulverizing the fired product and mixing gypsum with the pulverized product,
Etc.
In the case of (1) above, the fired product and gypsum are preferably pulverized to a Blaine specific surface area of 2500 to 4800 cm ² / g, more preferably 3000 to 4600 cm ² / g.
In the case of (2) above, the fired product is preferably pulverized to a Blaine specific surface area of 2500 to 4800 cm ² / g, more preferably 3000 to 4600 cm ² / g. The gypsum is preferably one having a specific surface area of 2500 to 5000 cm ² / g, more preferably 3000 to 4500 cm ² / g.

As a method for producing a hydraulic composition comprising a pulverized product of calcined product, gypsum and inorganic powder, for example,
(1) A method of simultaneously pulverizing a fired product and gypsum, and mixing the pulverized product with one or more inorganic powders selected from blast furnace slag powder, fly ash, limestone powder, and quartzite powder,
(2) A method of pulverizing a fired product and mixing the pulverized product with gypsum and one or more inorganic powders selected from blast furnace slag powder, fly ash, limestone powder, and silica stone powder,
(3) A method of simultaneously pulverizing one or more inorganic powders selected from a calcined product, gypsum, blast furnace slag powder, fly ash, limestone powder, and silica powder,
Etc.
In the case of (1) above, the fired product and gypsum are preferably pulverized to a Blaine specific surface area of 2500 to 4800 cm ² / g, more preferably 3000 to 4600 cm ² / g. The inorganic powder preferably has a Blaine specific surface area of 2500 to 5000 cm ² / g, more preferably 3000 to 4500 cm ² / g.
In the case of (2) above, the fired product is preferably pulverized to a Blaine specific surface area of 2500 to 4800 cm ² / g, more preferably 3,000 to 4600 cm ² / g. Further, as the gypsum and the inorganic powder, those having a specific surface area of 2500 to 5000 cm ² / g are preferable, and those having 3000 to 4500 cm ² / g are more preferable.

In the present invention, the brane specific surface area of the hydraulic composition is preferably 2500 to 4800 cm ² / g, preferably 3000 to 4600 cm ² / g in view of fluidity and strength development of mortar and concrete. Is more preferable.

The hydraulic composition of the present invention is used in the state of paste, mortar or concrete. As the water reducing agent, lignin-based, naphthalenesulfonic acid-based, melamine-based, and polycarboxylic acid-based water reducing agents (including AE water reducing agents, high-performance water reducing agents, and high-performance AE water reducing agents) can be used.
When used in the state of mortar or concrete, fine aggregates and coarse aggregates that are usually used in the production of mortar and concrete, that is, river sand, land sand, crushed sand, river gravel, mountain gravel, crushed stone, etc. Can be used. In addition, molten slag produced by melting one or more of municipal waste, municipal waste incineration ash, and sewage sludge incineration ash, or blast furnace slag, steelmaking slag, copper slag, coconut scrap, glass cullet, ceramic waste, clinker ash, waste brick In addition, waste such as concrete waste can be used for some or all of fine aggregate and coarse aggregate.
If necessary, an admixture such as an air entraining agent or an antifoaming agent may be used within a range that does not hinder the operation.

The method of kneading paste, mortar, or concrete is not particularly limited. For example, (1) a method in which each material is put into a mixer at once and kneaded for 1 minute or more, and (2) a material other than water is mixed in the mixer. After adding and kneading, water can be added and mixed for 1 minute or longer. The mixer used for kneading is not particularly limited, and may be kneaded with a conventional mixer such as a Hobart mixer, a pan type mixer, or a biaxial mixer.
The method for forming the paste, mortar or concrete is not particularly limited, and for example, vibration molding or the like may be performed.
Further, the curing conditions are not particularly limited, and for example, air curing, underwater curing, steam curing, or the like may be performed.

Hereinafter, the present invention will be described by way of examples.
1. Example 1
(1) Production of fired product:
As raw materials, sewage sludge, construction generated soil, waste borosilicate glass (SiO ₂ : 81.0 mass%, Al ₂ O ₃ : 2.0 mass%, R ₂ O: 4.0 mass%, B ₂ O ₃ : 13 mass%), Using general Portland cement clinker raw materials such as limestone, hydraulic rate: 2.2, silicic acid rate: 2.35, iron rate: 1.8, C ₃ A content: 9.5 mass%, B ₂ O ₃ content: 0.03 mass %, SO ₃ content; 0.5% by mass of the fired product was produced by firing at 1450 ° C. using an electric furnace.
The amount of free lime in the fired product was 0.6% by mass.

(2) Manufacture of hydraulic composition To the above-mentioned baked product, drained dihydrate gypsum (manufactured by Sumitomo Metals) and hemihydrate gypsum obtained by heating the drained dihydrate gypsum at 140 ° C. are added, batch type A hydraulic composition was produced by simultaneous grinding with a ball mill so that the specific surface area of the brain was 3250 cm ² / g.
The amount of dihydrate gypsum (in terms of SO ₃ ) in the hydraulic composition is 0.8 parts by mass with respect to 100 parts by mass of the pulverized product of the baked product, and the amount of hemihydrate gypsum (in terms of SO ₃ ) is pulverized of the baked product. 0.8 parts by mass with respect to 100 parts by mass of the product.

(3) Evaluation About the said hydraulic composition, the hydration heat, the flow value, and the compressive strength were measured with the following method.
(1) Heat of hydration Measured according to “JIS R 5201 (physical test method for cement)”.
(2) Flow value Using the above hydraulic composition and fine aggregate (standard sand defined in JIS R 5201), water and polycarboxylic acid-based high-performance AE water reducing agent (BASF Pozzolith "Reobuild SP8N"), Mortar was prepared and the mortar flow value immediately after kneading was measured. The mortar was formulated such that the water / hydraulic composition (mass) ratio = 0.35, the fine aggregate / hydraulic composition (mass) ratio = 2.0, and the water reducing agent / hydraulic composition (mass) ratio = 0.0005. Kneading was carried out for 7 minutes. The mortar immediately after kneading was put into a flow cone (top diameter 5 cm, bottom diameter 10 cm, height 15 cm), and the spread of the mortar when the flow cone was removed upward was measured to obtain a flow value. .
(3) Compressive strength The compressive strength (3 days, 7 days and 28 days) of mortar was measured according to "JIS R 5201 (Cement physical test method)". The mortar was mixed with a water / hydraulic composition (mass) ratio of 0.5 and a fine aggregate / hydraulic composition (mass) ratio of 3.0.
As a result, the heat of hydration on the 7th was 330 (J / g), the heat of hydration on the 28th was 380 (J / g), the flow value was 281 (mm), and the compression strength on the 3rd was 31.2 (N / mm ² ), the compression strength on the 7th was 46.0 (N / mm ² ), and the compression strength on the 28th was 62.8 (N / mm ² ).

2. Example 2
To the fired product of Example 1, drained dihydrate gypsum (manufactured by Sumitomo Metals) and hemihydrate gypsum obtained by heating the drained dihydrate gypsum at 140 ° C. were added. After simultaneous grinding to 3250 cm ² / g, blast furnace slag powder (Brain specific surface area 4000 cm ² / g) was mixed to produce a hydraulic composition.
The amount of blast furnace slag powder in the hydraulic composition is 65 parts by mass with respect to 100 parts by mass of the pulverized product of the fired product, and the amount of dihydrate gypsum (in terms of SO ₃ ) is 100 parts by mass of the pulverized product of the calcined product. The amount of hemihydrate gypsum (in terms of SO ₃ ) is 0.6 parts by mass with respect to 100 parts by mass of the pulverized product of the fired product.
The hydraulic composition was measured for heat of hydration, flow value and compressive strength in the same manner as in Example 1.
As a result, the heat of hydration on the 7th was 304 (J / g), the heat of hydration on the 28th was 340 (J / g), the flow value was 330 (mm), and the compression strength on the 3rd was 23.3 (N / mm ² ), the compression strength on the 7th was 34.2 (N / mm ² ), and the compression strength on the 28th was 59.0 (N / mm ² ).

3. Example 3
A fired product (hydraulic modulus: 2.05, silicic acid rate: 1.32, iron rate: 1.81, C ₃ A content: 14.5% by mass, B ₂ O ₃ content: 0.1% by mass using the same raw materials as in Example 1. , SO ₃ content; 0.2% by mass).
To the calcined product, drained dihydrate gypsum (manufactured by Sumitomo Metals) and hemihydrate gypsum obtained by heating the drained dihydrate gypsum at 140 ° C. were added, and the specific surface area of the brain was 4200 cm ² / A hydraulic composition was produced by simultaneous grinding to g.
The amount of dihydrate gypsum in the hydraulic composition (in terms of SO ₃ ) is 1.2 parts by mass with respect to 100 parts by mass of the pulverized product of the fired product, and the amount of hemihydrate gypsum (in terms of SO ₃ ) It is 1.5 parts by mass with respect to 100 parts by mass of the object.
The hydraulic composition was measured for heat of hydration, flow value and compressive strength in the same manner as in Example 1.
As a result, the heat of hydration on the 7th was 350 (J / g), the heat of hydration on the 28th was 418 (J / g), the flow value was 240 (mm), and the compression strength on the 3rd was 29.0 (N / mm ² ), the compression strength on the 7th was 44.8 (N / mm ² ), and the compression strength on the 28th was 57.0 (N / mm ² ).

4). Example 4
A fired product (hydraulic modulus: 2.05, silicic acid ratio: 1.32, iron ratio: 1.81, C ₃ A content: 14.5 mass%, B ₂ O ₃ content: 0.3 mass% using the same raw materials as in Example 1. , SO ₃ content; 0.3% by mass).
A hydraulic composition was produced in the same manner as in Example 3 above.
The hydraulic composition was measured for heat of hydration, flow value and compressive strength in the same manner as in Example 1.
As a result, the heat of hydration on the 7th was 339 (J / g), the heat of hydration on the 28th was 398 (J / g), the flow value was 260 (mm), and the compression strength on the 3rd was 27.9 (N / mm ² ), the compression strength on the 7th was 43.8 (N / mm ² ), and the compression strength on the 28th was 59.5 (N / mm ² ).

5. Example 5
To the fired product of Example 4, drained dihydrate gypsum (manufactured by Sumitomo Metals Co., Ltd.) and hemihydrate gypsum obtained by heating the drained dihydrate gypsum at 140 ° C. were added. After simultaneous pulverization to 4200 cm ² / g, blast furnace slag powder (Brain specific surface area 4000 cm ² / g) was mixed to produce a hydraulic composition.
The amount of blast furnace slag powder in the hydraulic composition is 65 parts by mass with respect to 100 parts by mass of the pulverized product of the fired product, and the amount of dihydrate gypsum (in terms of SO ₃ ) is 100 parts by mass of the pulverized product of the fired product. The amount of hemihydrate gypsum (in terms of SO ₃ ) is 1.5 parts by mass with respect to 100 parts by mass of the pulverized product.
The hydraulic composition was measured for heat of hydration, flow value and compressive strength in the same manner as in Example 1.
As a result, the heat of hydration on the 7th was 310 (J / g), the heat of hydration on the 28th was 360 (J / g), the flow value was 340 (mm), and the compression strength on the 3rd was 23.0 (N / mm ² ), the compression strength on the 7th was 34.9 (N / mm ² ), and the compression strength on the 28th was 59.5 (N / mm ² ).

6). Example 6
To the fired product of Example 4, drained dihydrate gypsum (manufactured by Sumitomo Metals Co., Ltd.) and hemihydrate gypsum obtained by heating the drained dihydrate gypsum at 140 ° C. were added. After simultaneous grinding to 4200 cm ² / g, blast furnace slag powder (Blaine specific surface area 4000 cm ² / g) and limestone powder (Blaine specific surface area 4000 cm ² / g) were mixed to produce a hydraulic composition.
The amount of blast furnace slag powder in the hydraulic composition is 65 parts by weight with respect to 100 parts by weight of the pulverized product of the fired product, and the amount of limestone powder is 5 parts by weight with respect to 100 parts by weight of the pulverized product of the fired product, two water gypsum weight (SO ₃ equivalent) of 1.2 parts by mass based on the pulverized product 100 parts by weight of the baked product, 1.5 mass relative to pulverized product 100 parts by weight of hemihydrate gypsum weight (SO ₃ equivalent) fired product Part.
The hydraulic composition was measured for heat of hydration, flow value and compressive strength in the same manner as in Example 1.
As a result, the heat of hydration on the 7th was 305 (J / g), the heat of hydration on the 28th was 350 (J / g), the flow value was 342 (mm), and the compression strength on the 3rd was 24.0 (N / mm ² ), the compression strength on the 7th was 35.8 (N / mm ² ), and the compression strength on the 28th was 60.5 (N / mm ² ).

7). Comparative Example 1
Commercial Portland cement (hydraulic modulus: 2.1, silicic acid rate: 2.5, iron rate: 1.8, C ₃ A content: 8.8% by mass, B ₂ O ₃ content: 0.006% by mass, dihydrate gypsum content (SO ₃ conversion) is 0.8 parts by mass with respect to 100 parts by mass of the clinker pulverized product, and the amount of hemihydrate gypsum (SO ₃ conversion is 0.9 part by mass with respect to 100 parts by mass of the clinker pulverized product). The compressive strength was measured in the same manner as in Example 1.
As a result, the heat of hydration on the 7th was 340 (J / g), the heat of hydration on the 28th was 400 (J / g), the flow value was 262 (mm), and the compression strength on the 3rd was 30.8 (N / mm ² ), the compression strength on the 7th was 46.0 (N / mm ² ), and the compression strength on the 28th was 61.0 (N / mm ² ).

8). Comparative Example 2
The heat of hydration, flow value and compressive strength were measured in the same manner as in Example 1 for commercially available Blast Furnace Cement B (content of blast furnace slag powder was 40% by mass).
As a result, the heat of hydration on the 7th was 308 (J / g), the heat of hydration on the 28th was 360 (J / g), the flow value was 310 (mm), and the compression strength on the 3rd was 20.5 (N / mm ² ), the compression strength on the 7th was 34.0 (N / mm ² ), and the compression strength on the 28th was 58.0 (N / mm ² ).

9. Comparative Example 3
Commercially available eco-cement (hydraulic rate: 2.05, silicic acid rate: 1.40, iron rate: 1.81, C ₃ A content: 13.5% by mass, B ₂ O ₃ content: 0.009% by mass, dihydrate gypsum content (SO ₃ equivalent) of 1.5 parts by mass based on clinker ground product 100 parts by mass, the hemihydrate gypsum weight (SO ₃ equivalent) 1.5 parts by weight with respect to clinker pulverized product 100 parts by mass, Blaine specific surface area of 4200cm ² / g) The heat of hydration, flow value and compressive strength were measured in the same manner as in Example 1.
As a result, the heat of hydration on the 7th was 366 (J / g), the heat of hydration on the 28th was 426 (J / g), the flow value was 200 (mm), and the compression strength on the 3rd was 31.1 (N / mm ² ), the compression strength on the 7th was 44.0 (N / mm ² ), and the compression strength on the 28th was 55.5 (N / mm ² ).

  As described above, in the hydraulic composition of the present invention, the heat of water hydration was small and the fluidity was good even when the waste composition was used as a raw material. Moreover, in the mortar using the hydraulic composition of the present invention, strength development was also good.

Claims (4)

Hydraulic ratio (HM) is 1.8 to 2.3, silicic acid ratio (SM) is 1.0 to 2.4, iron ratio (IM) is 1.3 to 2.8, 3CaO · Al ₂ O ₃ content is 9.0 to 18.0 mass%, and, B ₂ O ₃ and pulverized content fired product is at least 0.01 mass%, hydraulic composition, which comprises a gypsum. The relationship between the 3CaO · Al ₂ O ₃ content X (mass%) and the B ₂ O ₃ content Y (mass%) in the calcined product is 0.0017X−0.005 ≦ Y ≦ 0.0667X−0.2. The hydraulic composition according to claim 1, wherein the hydraulic composition is a satisfactory fired product.   The hydraulic composition according to claim 1 or 2, comprising at least one inorganic powder selected from blast furnace slag powder, fly ash, limestone powder, and silica powder. Ratio of SO ₃ 2 dihydrate gypsum and hemihydrate gypsum to the total SO ₃ hydraulic composition is 40 mass% or more and the proportion of hemihydrate gypsum for the total amount of 2 dihydrate gypsum and hemihydrate gypsum the hydraulic composition according to claim 1 converted to SO ₃ is 30 mass% or more.