JP4796402B2 - Hydrated cured body and method for producing the same - Google Patents

Description

The present invention relates to a hydrated cured body having a reinforcing bar inside, and more specifically, it suppresses corrosion of the internal reinforcing bar even in an environment where neutralization is likely to proceed, such as an environment in which dry and wet conditions are repeated, and provides long-term durability. The present invention relates to a hydrated cured product excellent in neutralization resistance and a method for producing the same, which can be used as a structural member having a property.

  Reinforced concrete is a structural member that exhibits a strength and durability over a long period of time because a passive film is formed on the surface of the reinforcing bar by the alkali component in the concrete, thereby preventing corrosion of the reinforcing bar. Therefore, when the concrete is neutralized, the passive film is destroyed and the rebar is corroded, so that it does not function as a structural member.

  In recent years, the availability of concrete aggregates has deteriorated, and for example, andesite, which may cause an alkali aggregate reaction, has to be used as a concrete aggregate. When cracks occur in the concrete due to the alkali aggregate reaction, the neutralization of the concrete proceeds rapidly, causing problems such as corrosion of the reinforcing bars. Even in the case of concrete using high-quality aggregates, if it is used in an environment where neutralization is likely to progress, such as repeated drying and wetting, the neutralization of the concrete will result in passivity of the reinforcing bar surface. The film is destroyed and the rebar is corroded and the concrete is peeled off due to the volume expansion caused by the generated rust. Naturally, by increasing the thickness of the concrete existing between the reinforcing bar and the outside world (called “covering thickness”), it is possible to delay the time until the surface of the reinforcing bar becomes neutral, Since the structure becomes larger due to the increase in the cover thickness of the concrete, there arises a problem that the cost increases.

  The following techniques have been proposed as means for preventing corrosion of reinforcing bars due to the above-mentioned neutralization of concrete. For example, in Patent Document 1, a film of an organic polymer composition having a low carbon dioxide gas or water vapor permeability is formed on the surface of a concrete structure, and carbon dioxide gas or water vapor that causes neutralization is applied to the concrete structure. A method has been proposed to prevent the inside from entering. Further, Patent Document 2 proposes a method of kneading and compacting at a low cement ratio, densifying the concrete, and preventing carbon dioxide gas or water vapor that causes neutralization from entering the concrete. . Furthermore, Patent Document 3 discloses that an external electrode is installed on the surface of neutralized concrete, the reinforcing bar inside the concrete is used as the internal electrode, and the temperature of the concrete portion to which current is applied is increased between the external electrodes or outside. There has been proposed a method for recovering the alkalinity of neutralized concrete by applying an electric current between the electrode and the internal electrode.

  However, these methods have the following problems. That is, the method disclosed in Patent Document 1 for forming a coating that blocks the intrusion of carbon dioxide or water vapor on the surface of a concrete structure is altered by irradiation with sunlight or the like, and the coating is cracked or has a coating. There is a problem that it is not possible to prevent neutralization over a long period of time due to peeling. The method of reducing the water-cement ratio disclosed in Patent Document 2 is effective when a high-quality aggregate that does not cause an alkali-aggregate reaction is used, but an aggregate that causes an alkali-aggregate reaction is used. When used, it is not effective, and if the water-cement ratio is reduced, not only the cost is increased, but also the adverse effect that the self-shrinkage of the concrete increases. The method of applying a current disclosed in Patent Document 3 requires a large-scale device, and it is very expensive to operate and maintain such a device over a long period of time.

By the way, in recent years, Patent Document 4 and Non-Patent Document 1 disclose hydrated hardened bodies that can use steelmaking slag and blast furnace slag fine powder as main raw materials and that can replace concrete.
JP-A 61-236669 JP-A-2-208252 JP-A-7-291767 JP 2001-49310 A Steel Slag Hydrated Solids Technical Manual, Coastal Development Technology Research Center, 2003

The present inventors have studied various means for suppressing the neutralization of reinforced concrete. As a result, it is extremely effective to use steel slag and blast furnace slag fine powder as the main raw material as a substitute for concrete to suppress neutralization and prevent corrosion of reinforcing bars. And gained knowledge. This is because steelmaking slag has a high slag composition of CaO / SiO ₂ (basicity), and the periphery of the reinforcing bar is maintained at a high alkali for a long period of time. In addition, this hydrated cured product exhibits mechanical strength equivalent to that of concrete, and there is no problem as a substitute for concrete.

  From this viewpoint, the hydrated cured product disclosed in Patent Document 4 and Non-Patent Document 1 was verified. However, the use of the hydrated cured body disclosed in Patent Document 4 is unclear, and the hydrated cured body disclosed in Non-Patent Document 1 limits the substitution of unreinforced concrete that does not contain reinforcing steel as a target. The performance of neutralization resistance itself was unknown.

  Accordingly, the present inventors investigated and measured the resistance to neutralization of these hydrated cured bodies. As a result, it was found that these hydrated cured bodies have extremely large variations in neutralization resistance and are difficult to use stably. That is, it has been found that it is difficult to prevent the corrosion of the reinforcing bars by suppressing the neutralization in the conventional hydrated hardened body made mainly of steelmaking slag and blast furnace slag fine powder.

The present invention has been made in view of the above circumstances, and the object of the present invention is to suppress corrosion of internal reinforcing bars even in an environment where neutralization is likely to proceed, such as in an environment where dry and wet conditions are repeated. An object of the present invention is to provide a hydrated cured product excellent in neutralization resistance and a method for producing the same, which can be used as a structural member having long-term durability.

The hydrated cured body according to the first invention for solving the above-mentioned problem is a hydrated cured body having a reinforcing bar inside, and the hydrated cured body has a CaO / SiO ₂ mass ratio of 1.5. Steel slag and blast furnace slag fine powder having a CaO concentration of less than 25% by mass or less, and one selected from the group of B type fly ash cement and slaked lime that conform to Portland cement , JIS R5213 "Fly ash cement" or a two or more, mixed with water in a range satisfying the following equation (1) state, and are obtained by curing the resulting mixture, the content of steel slag is at 2239kg / m ³ or more, the Content of the blast furnace slag fine powder in a mixture is 100-600 kg / m < ³ > , The said mixture contains fly ash further, It is characterized by the above-mentioned.
P + 0.85 × F + CH ≧ 55 ... (1)
However, in the formula (1), each symbol represents the following.
P: Portland cement content in the mixture (kg / m ³ )
F: Content of fly ash cement in the mixture (kg / m ³ )
CH: Slaked lime content in the mixture (kg / m ³ )

The method for producing a hydrated and cured product according to the second invention is a method for producing a hydrated and cured product having a reinforcing bar therein, wherein CaO / SiO ₂ is less than 1.5 by mass ratio or the CaO concentration is 25% by mass. a steel slag and blast-furnace slag under further Portland cement, and JIS R5213 "fly ash cement" to be selected from the group of compatible B species fly ash cement and hydrated lime were one or more, the (1) was mixed with water in a range satisfying a viewing including the step of curing the resulting mixture, the content of steel slag is at 2239kg / m ³ or more, inclusion of ground granulated blast furnace slag in the mixture The amount is 100 to 600 kg / m ³ , and the mixture further contains fly ash .

According to the hydrated cured body and the manufacturing method thereof according to the present invention having the above-described configuration, the steelmaking slag as a raw material acts as a neutralization inhibiting material, and the conventional concrete is formulated by blending blast furnace slag fine powder having latent hydraulic properties. A hardened material with a denser structure is formed, and the penetration and permeation of carbon dioxide and water vapor that cause neutralization is suppressed, and one or more of Portland cement , fly ash cement, and slaked lime are used. Since the inside of the hydrated cured body is kept alkaline for a long period of time by blending a predetermined amount of the above, corrosion of reinforcing bars arranged inside the hydrated cured body can be prevented for a long period of time. That is, according to the present invention, it is possible to provide a structure that can be used for a long period of time even in an environment where conventional reinforced concrete collapses in a short period due to corrosion of the reinforcing bar due to neutralization.

  By optimizing the raw material of the hydrated hardened body, the present inventors have made it more resistant to neutrality than the conventional hydrated hardened body made of conventional concrete, steelmaking slag, blast furnace slag fine powder, etc. An excellent hydrated and cured product is obtained, and it is found that it can be used as a structural member with long-term durability even in an environment where neutralization is likely to proceed, such as repeated drying and wetting, by combining this with a reinforcing bar. The present invention has been completed.

  First, the compounding raw material of the hydrated cured product according to the present invention will be described. In the hydrated cured product according to the present invention, as a raw material for mixing, steelmaking slag and blast furnace slag fine powder, and further, one or more selected from the group of Portland cement, blast furnace cement, fly ash cement and slaked lime are used. To do. In addition to these, it is preferable to further use fly ash. Naturally, the reinforcing bar arranged inside the hydrated cured body is also one of the raw materials constituting the hydrated cured body according to the present invention, and kneading water, admixture and the like are blended raw materials. The hydrated cured product according to the present invention is obtained by mixing these blending raw materials to form a mixture and curing the mixture.

1. Steelmaking slag Among the blended raw materials of the hydrated hardened body according to the present invention, steelmaking slag acts as an aggregate and a binder, and further as a neutralization inhibiting material for the hydrated hardened body. The particle size distribution of the steelmaking slag for acting as an aggregate is a particle size corresponding to fine aggregate or coarse aggregate for concrete, the particle size is about 0.075 mm or more, and the maximum particle size is about 40 mm or less. It is preferable to do. Moreover, it is preferable that the steelmaking slag for making it act as a binder is a fine powder, and it is preferable that a particle size is less than about 0.15 mm. Therefore, a steelmaking slag having an appropriate particle size distribution containing slag particles satisfying the particle size as a binder and the particle size as an aggregate (for example, steelmaking slag or pulverization processed under certain conditions). It is desirable to use steelmaking slag that is sieved later.

Steelmaking slag for acting as a neutralization inhibiting material preferably has a slag composition of CaO / SiO ₂ of 1.5 or more by mass ratio or a CaO concentration in the slag of 25% by mass or more. CaO / SiO ₂ is 1.5 or more or CaO concentration of 25 mass% or more steel slag in mass ratio, was dissolved in water CaO component in the steelmaking slag is contained in the hydrated cured body over a long period of time, hydration Keep the cured body weakly alkaline and suppress neutralization. Therefore, a more preferable steelmaking slag has a mass ratio of CaO / SiO ₂ of 2.0 or more or a CaO concentration of 30 mass% or more. In general, when the CaO / SiO ₂ or CaO concentration is increased, the hydration and expansion property by free CaO (free-CaO) in the steelmaking slag is increased, but there is no problem if the expansion stability of the hydrated cured body is ensured. These upper limits are not specified.

In addition, steelmaking slag does not cause an alkali-aggregate reaction unlike aggregates such as ordinary gravel, so it not only has excellent durability of the hydrated hardened body itself, but can also suppress the occurrence of cracks due to the alkali-aggregate reaction. Therefore, neutralization through cracks does not occur, which is preferable from the viewpoint of corrosion prevention of reinforcing steel in the hydrated cured body. The compounding amount of the steelmaking slag is preferably 500 kg / m ³ or more in the mixture in which the compounding raw materials constituting the hydrated cured body are mixed.

2. Blast-furnace slag fine powder Blast-furnace slag fine powder is used as a raw material of the hydrated cured product according to the present invention because the blast furnace slag fine powder having latent hydraulic properties is subjected to alkali stimulation by steelmaking slag and efficiently hydrates. Not only for this purpose, but because the cured product has a denser structure than conventional concrete, the penetration and permeation of carbon dioxide gas and water vapor, which cause neutralization of the hydrated cured body, can be remarkably suppressed. Moreover, it is because blast furnace slag fine powder and the free CaO in steelmaking slag react, and the hydration expansion of steelmaking slag is suppressed. As the blast furnace slag fine powder, JIS A 6206: 1997 “Blast furnace slag fine powder for concrete” can be used particularly preferably.

It is preferable that the compounding quantity of blast furnace slag fine powder shall be 100-600 kg / m < ³ > in the mixture with which the compounding raw material which comprises a hydration hardening body was mixed. If it is less than 100 kg / m ³ , the compressive strength of 18 N / mm ² or more necessary as a concrete substitute may not be obtained. On the other hand, if it exceeds 600 kg / m ³ , there will be almost no increase in strength and it will be uneconomical. . A more preferable blending amount of the blast furnace slag fine powder is 200 to 400 kg / m ³ .

3. Portland cement, blast furnace cement, fly ash cement, slaked lime The hydrated and cured product according to the present invention comprises one or more selected from the group of Portland cement, blast furnace cement, fly ash cement and slaked lime as described below (1 ) In a range that satisfies the formula. However, in the formula (1), P is the content (kg / m ³ ) of Portland cement in the mixture in which the blended raw materials constituting the hydrated cured body are mixed, and B is the content of blast furnace cement in the mixture The amount (kg / m ³ ), F is the fly ash cement content (kg / m ³ ) in the mixture, and CH is the slaked lime content (kg / m ³ ) in the mixture.

Since these cement raw materials and slaked lime are different in alkali strength but are alkaline, by adding these cement raw materials satisfying the formula (1), CaO / SiO ₂ is less than 1.5 by mass ratio. Even in the case of a hydrated and cured body using a steelmaking slag having a CaO concentration of less than 25% by mass, the inside can be kept alkaline for a long period of time. That is, neutralization of the hydrated cured product can be prevented. From the viewpoint of keeping the inside of the hydrated cured body alkaline for a long period of time, it is preferable that the sum of the left side of the formula (1) is 70 or more. The upper limit value of the sum of the left sides of the equation (1) is not particularly set, but even if it exceeds 150, the neutralization effect is saturated and there is almost no further improvement. The coefficient of each raw material in the formula (1) is based on the alkali strength of each raw material.

  In addition, the Portland cement in the present invention is a normal Portland cement described in JIS R 5210: 2003 “Portland cement”, an early early Portland cement, an ultra early early Portland cement, a moderately hot Portland cement, a low heat Portland cement, a sulfuric acid resistant material. It is salt Portland cement. The blast furnace cement is A type, B type or C type described in JIS R 5211: 2003 “Blast furnace cement”. The fly ash cement is A type, B type or C type described in JIS R 5213: 1997 “Fly ash cement”.

4). Fly ash It is preferable that the hydrated cured body according to the present invention further contains fly ash. Fly ash is used as a raw material for the hydrated hardened body because the Ca component in the steelmaking slag and fly ash react efficiently, so that the pozzolanic reaction of fly ash proceeds and a dense hardened body is formed. This is because the penetration and permeation of carbon dioxide and water vapor, which cause neutralization of the Japanese cured product, can be suppressed. Moreover, it is also for fly ash and the free CaO in steelmaking slag to react, and to suppress the hydration expansion of steelmaking slag. Furthermore, there is an effect of improving workability by blending an appropriate amount of fly ash. As the fly ash, JIS A 6201: 1999 “Fly ash for concrete” is preferably used, but it is also possible to use raw powder and pressurized fluidized bed ash.

Although the compounding quantity of fly ash is not specifically limited, It is preferable that it is 50-300 kg / m < ³ > in the mixture with which the compounding raw material which comprises a hydration hardening body was mixed. If it is less than 50 kg / m ³ , the effect of suppressing the hydration expansion of steelmaking slag is low. On the other hand, if it exceeds 300 kg / m ³ , the viscosity of the fresh state after adding water and kneading increases and the workability deteriorates. This is because the effect of suppressing the hydration expansion of the steelmaking slag is also unchanged and uneconomical.

5. Reinforcing Bar The hydrated cured body according to the present invention has a reinforcing bar inside, thereby ensuring the proof stress necessary as a structural member. As the reinforcing bars, it is preferable to use JIS G 3112: 2004 “Steel bars for reinforced concrete” or JIS G 3117: 1987 “Recycled bars for reinforced concrete”.

  The ratio of the reinforcing bars to the hydrated hardened body is such that the cross-sectional area of the reinforcing bars relative to the cross-sectional area of the hydrated hardened body is 0.2 to 10% in the cross section perpendicular to the longitudinal direction of the reinforcing bars. It is preferable to do. When the cross-sectional area of the reinforcing bar is less than 0.2%, it is difficult to obtain the effect of reinforcing the strength of the structural member by the reinforcing bar composition, and when the cross-sectional area of the reinforcing bar exceeds 10%, an effect commensurate with the raw material cost is obtained. This is because the working efficiency tends to decrease.

  Using these raw materials, the hydrated cured body according to the present invention is produced. That is, the above raw materials are blended, and water is further added to form a mixture. This mixture is kneaded, and is cast into a predetermined formwork and cured. Reinforcing bars are placed and hardened during driving to obtain a hydrated hardened body having reinforcing bars.

  As a curing method for the hydrated cured body, any method that is usually used, such as underwater curing, on-site curing, and steam curing, can be used as long as a predetermined strength can be secured. The cover thickness, which is the thickness from the surface of the reinforcing bar to the outer surface of the hydrated cured body, is preferably 20 mm or more. This is because if the cover thickness is less than 20 mm, the penetration and permeation of carbon dioxide gas and water vapor that cause neutralization from the outside may not be sufficiently blocked.

  As described above, according to the hydrated and cured body according to the present invention, the steelmaking slag as a raw material for blending acts as a neutralization inhibitor, and by blending fine powder of blast furnace slag having latent hydraulic properties, compared with conventional concrete. A hardened material having a dense structure is formed, and the penetration and permeation of carbon dioxide gas and water vapor, which cause neutralization, is suppressed, and one or two of Portland cement, blast furnace cement, fly ash cement, slaked lime Since the inside of the hydrated cured body is kept alkaline for a long period of time by blending a predetermined amount of seeds or more, corrosion of the reinforcing bars disposed inside the hydrated cured body can be prevented for a long period of time.

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

  Steelmaking slag having the chemical composition and physical properties shown in Table 1 (maximum dimensions, coarse grain ratio, fine aggregate ratio, surface dry density) was used. The coarse grain ratio is a coarse grain ratio of No. 3115 defined in JIS A 0203: 1999 “Concrete terms”. The fine aggregate ratio is a value representing the absolute volume of the steelmaking slag amount with a particle size of 5 mm or less with respect to the total capacity of the steelmaking slag as a percentage.

  Blast furnace slag fine powder used was blast furnace slag fine powder 4000 in JIS A 6206: 1997 “Blast furnace slag fine powder for concrete”, and fly ash used type II in JIS A 6201: 1999 “fly fly ash for concrete”. As the Portland cement, ordinary Portland cement conforming to JIS R 5201: 2003 “Portland cement” was used. As the blast furnace cement, B type that conforms to JIS R 5211: 2003 “Blast furnace cement” was used. As the fly ash cement, type B conforming to JIS R 5213: 1997 “fly ash cement” was used. The slaked lime used was industrial slaked lime / special name conforming to JIS R 9001: 1993. As the admixture, a polycarboxylic acid-based high-performance AE water reducing agent conforming to JIS A 6204: 2000 was used.

The raw materials of these hydrated cured bodies were charged into a mixer with the formulation shown in Table 2, and this mixture was kneaded with the mixer, poured into a mold having a diameter of 100 mm and a height of 200 mm, cured, and blended No. 1 Twelve test pieces for measuring compressive strength were produced. The compressive strength was measured according to JIS A 1108 “Method for testing compressive strength of concrete”. The curing conditions were standard curing 28 days. At the same time, a test piece for a neutralization promotion test of 100 mm in length, 100 mm in width, and 400 mm in height was manufactured. The curing conditions were standard curing 28 days. Neutralization acceleration test conforms to JIS A 1153: 2003 “Accelerated neutralization test method for concrete” and test pieces are exposed for 26 weeks under conditions of 5% CO ₂ concentration, temperature 20 ° C. and relative humidity 60%. Then, about what was cut | disconnected by 60 mm pitch, the neutralization depth was measured and it evaluated by the average value. The neutralization depth was measured by using a 1% by mass aqueous solution spraying method of phenolphthalein and setting the non-colored portion to the neutralized portion. Table 2 also shows the measurement results of the compressive strength and the results of the neutralization promotion test. In the remarks column of Table 2, the hydrated cured product having a blending ratio that satisfies the scope of the present invention is indicated as “Invention Example”, and the other hydrated cured product is indicated as “Comparative Example”. .

  As a conventional example for comparison, concrete raw materials are kneaded by a mixer with the composition shown in Table 3, and poured into a mold having a diameter of 100 mm, a height of 200 mm, and a mold having a length of 100 mm, a width of 100 mm, and a height of 400 mm. After curing, test pieces for measuring compressive strength and test pieces for promoting neutralization were prepared (Formulation No. 13). The curing conditions were 28 days for standard curing for both the test piece for compressive strength measurement and the test piece for neutralization promotion test. The compressive strength test and the neutralization promotion test were performed by the same method as described above. In addition, the aggregate of the raw material for concrete used the quality thing determined to be "harmless" by the test by JIS A 1145: 2001 "Aggregate alkali-silica reactivity test method (chemical method)". Table 3 also shows the measurement results of the compressive strength and the results of the neutralization promotion test.

  As apparent from Tables 2 and 3, Portland cement, blast furnace cement, fly ash cement, and slaked lime are included in the range containing steelmaking slag and fine powder of blast furnace slag and satisfying the above-mentioned formula (1). Hydrated cured bodies (mixture Nos. 1 to 8) obtained by curing a mixture containing one or more selected from the above are ordinary concrete (mixed No. 1-8) using a high-quality aggregate The neutralization depth was smaller than that of No. 13), indicating excellent neutralization resistance. On the other hand, the hydrated cured product (mixing No. 9 to 12) which does not fall under the present invention is more resistant to neutrality than ordinary concrete (mixing No. 13) with a water binder ratio of 50% using good quality aggregates. inferior.

  Further, in the raw material mixture of the hydrated cured body with the composition of Table 2 and Table 3, the cross section of the reinforcing bar is 2% relative to the cross sectional area of the hydrated cured body in the cross section perpendicular to the longitudinal direction of the reinforcing bar Under such conditions, the cover thickness was set to 30 mm, and it was driven into a mold having a length of 100 mm, a width of 100 mm, and a height of 400 mm. As the reinforcing bar, a round bar SR235 D13 conforming to JIS G 3112: 2004 “Steel for Reinforced Concrete” was used. After removing the frame, it was cured in water at 20 ° C. until the age of 28 days, leaving a surface with a controlled cover thickness, and covering all other surfaces with an epoxy resin to obtain a test material.

  This test material was subjected to a dry / wet repeated test with one cycle consisting of 60 ° C., 50% relative humidity, 4 days of drying conditions, and 60 ° C., 3% by weight NaCl aqueous solution for 3 days. It was. After 30 cycles of this wet and dry test, the hydrated hardened body was destroyed and the rebar was taken out. The rebar was gradually rusted with a 10% by mass ammonium dihydrogen citrate aqueous solution, and the corrosion area ratio and measurement with a micrometer were performed. The maximum corrosion depth was measured. Table 4 shows the measurement results.

As shown in Table 4, no corrosion was observed in the reinforcing bars in the hydrated and cured body according to the present invention of Formulation Nos. 1 to 8. On the other hand, in the reinforcing steel in the ordinary concrete of the blend No. 13, the corrosion area ratio was 22% and the maximum erosion depth was 350 μm. On the other hand, corrosion was recognized by the neutralization of the hydration hardening body of the reinforcing steel in the hydration hardening body of the mixing | blending No. 9-12 which does not correspond to this invention.

Claims (2)

A hydrated and cured product having a reinforcing bar inside, the hydrated and cured product having a mass ratio of CaO / SiO ₂ of less than 1.5 or a CaO concentration of less than 25% by mass, and blast furnace slag fine powder, Further, one or two or more selected from the group of Portland cement , B-type fly ash cement and slaked lime conforming to JIS R5213 “Fly ash cement” are used as long as the following formula (1) is satisfied. mixed with state, and are obtained by curing the resulting mixture, the content of steel slag is at 2239kg / m ³ or more, the content of ground granulated blast furnace slag in the mixture are located at 100~600kg / m ³ The hydrated cured product , wherein the mixture further contains fly ash .
P + 0.85 × F + CH ≧ 55 ... (1)
However, in the formula (1), each symbol represents the following.
P: Portland cement content in the mixture (kg / m ³ )
F: Content of fly ash cement in the mixture (kg / m ³ )
CH: Slaked lime content in the mixture (kg / m ³ ) A method for producing a hydrated hardened body having a reinforcing bar inside, wherein steelmaking slag and blast furnace slag fine powder with a CaO / SiO ₂ ratio of less than 1.5 or a CaO concentration of less than 25% by mass, and Portland cement 1 type or 2 types or more selected from the group of B type fly ash cement and slaked lime that conform to JIS R5213 “Fly ash cement” are mixed with water in a range satisfying the following formula (1): look including the step of curing the resulting mixture, the content of steel slag is at 2239kg / m ³ or more, the content of ground granulated blast furnace slag in the mixture is 100~600kg / m ^3, wherein the mixture Furthermore , the manufacturing method of the hydration hardening body characterized by including a fly ash .
P + 0.85 × F + CH ≧ 55 ... (1)
However, in the formula (1), each symbol represents the following.
P: Portland cement content in the mixture (kg / m ³ )
F: Content of fly ash cement in the mixture (kg / m ³ )
CH: Slaked lime content in the mixture (kg / m ³ )