Method for producing cured body and cured body

Abstract

To provide a cured body production method and a cured body, capable of reducing an amount of discarded woody waste and reducing CO2 emissions.SOLUTION: A method comprises a step of producing charcoal from woody waste generated at a construction site, and a step of producing a cured body in which the charcoal is mixed.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a cured body and a cured body.

Background Art

[0002] Conventionally, it has been known to perform surface treatment on charcoal, which is a carbide made from biological resources and is said to be effective in activating organisms and improving the environment, and introduce it into cement or the like as a mixing material (see, for example, Patent Document 1). In addition, at construction sites including demolition work and new construction work (hereinafter referred to as construction sites), a large amount of used wood materials (for example, wood waste) are generated, and these wood wastes are incinerated.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When incinerating a large amount of wood waste generated at construction sites and the like, a large amount of CO2 is generated. In the face of the need to reduce CO2, which is a cause of global warming, it is required to reduce the amount of wood waste discarded and the amount of CO2 emissions in the disposal of wood waste.

[0005] The present invention has been made in view of such circumstances, and its object is to provide a method for manufacturing a cured body capable of reducing the amount of wood waste discarded and reducing the amount of CO2 emissions, and a cured body.

Means for Solving the Problems

[0006] The main invention for achieving such an object is a method for manufacturing a hardened body, comprising the steps of manufacturing charcoal from wood waste generated at a construction site and manufacturing a hardened body mixed with the charcoal. Other features of the present invention will be clarified by the description in this specification and the attached drawings.

Effects of the Invention

[0007] According to the present invention, it is possible to provide a method for manufacturing a hardened body capable of reducing the amount of wood waste discarded and reducing the amount of CO2 emissions, and a hardened body.

Brief Description of the Drawings

[0008]

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Mode for Carrying Out the Invention

[0009] From the descriptions in the following specification and drawings, at least the following matters become clear. Aspect 1: A method for manufacturing a hardened body, comprising a step of manufacturing charcoal from wood waste generated at a construction site and a step of manufacturing a hardened body mixed with the charcoal.

[0010] According to the method for manufacturing a hardened body of Aspect 1, the wood waste generated at the construction site is carbonized in an environment where it is not incinerated and does not combine with oxygen as much as possible to produce charcoal. Therefore, the amount of wood waste to be discarded can be reduced, and the emission of CO2 due to combustion can be suppressed to produce charcoal containing a large amount of carbon in a stable state. Then, since the manufactured charcoal is mixed with a binder such as cement, blast furnace slag fine powder, fly ash, amorphous powder, and alkali activator to manufacture a hardened body, it is possible to immobilize more CO2 with the manufactured hardened body. Therefore, it is possible to provide a method for manufacturing a hardened body capable of reducing the amount of wood waste to be discarded and reducing the amount of CO2 emissions.

[0011] Aspect 2: The method for manufacturing a hardened body according to Aspect 1, wherein the kneading time in the step of manufacturing a hardened body mixed with the charcoal is within 20 minutes.

[0012] According to the method for manufacturing a cured body of Mode 2, since the kneading time in the step of manufacturing a cured body mixed with carbon is within 20 minutes, it is possible to efficiently provide a cured body.

[0013] Mode 3: The method for manufacturing a cured body according to Mode 1 or Mode 2, wherein the slump in the fresh properties of the cured body is within ±2.5 cm of the specified slump of the cured body.

[0014] According to the method for manufacturing a cured body of Mode 3, since the slump in the fresh properties of the cured body is within ±2.5 cm of the specified slump of the cured body, it is possible to manufacture a cured body with excellent workability while ensuring the desired fluidity in the cured body.

[0015] Mode 4: The method for manufacturing a cured body according to any one of Modes 1 to 3, wherein the slump flow in the fresh properties of the cured body is within ±10.0 cm of the specified slump flow of the cured body.

[0016] According to the method for manufacturing a cured body of Mode 4, since the slump flow in the fresh properties of the cured body is within ±10.0 cm of the specified slump flow of the cured body, it is possible to manufacture a cured body with a more fluid fresh property.

[0017] Mode 5: The method for manufacturing a cured body according to any one of Modes 1 to 4, wherein the carbon has a carbon content of 50% or more.

[0018] According to the method for manufacturing a cured body of Mode 5, since the carbon content of the carbon to be mixed is 50% or more, it is possible to manufacture a cured body mixed with carbon containing more carbon, and it is possible to suppress the emission of CO2 by incinerating woody waste.

[0019] Mode 6: The method for manufacturing a cured body according to any one of Modes 1 to 5, wherein the amount of carbon mixed is more than 0 kg / m 3 and not more than 100 kg / m 3 as follows.

[0020] According to the method for manufacturing a cured body of Embodiment 6, by mixing carbon, it is possible to surely contain more carbon, and since the mixing amount of carbon is 100 kg / m 3 as follows, it becomes possible to manufacture a cured body without requiring a long kneading time.

[0021] Embodiment 7: A method for manufacturing a cured body according to any one of Embodiments 1 to 3, wherein the mixing ratio of the binder of the cured body is cement: blast furnace slag fine powder = 25 to 100: 75 to 0 in terms of mass ratio.

[0022] According to the method for manufacturing a cured body of Embodiment 7, since the binder is used in the cured body at a mixing ratio of cement: blast furnace slag fine powder = 25 to 100: 75 to 0 in terms of mass ratio, it is possible to reduce the CO2 emissions of the manufactured cured body.

[0023] Embodiment 8: A cured body characterized by having carbon derived from wood waste generated at a construction site and a binder.

[0024] According to the cured body of Embodiment 8, since it has carbon with a high carbon content rate produced by carbonizing wood waste generated at a construction site in an environment where it is less likely to combine with oxygen, and a binder such as cement, blast furnace slag fine powder, fly ash, amorphous powder, and alkali activator, it is possible to immobilize more CO2, reduce the CO2 emissions, and reduce the amount of wood waste to be discarded.

[0025] Embodiment 9: The cured body according to Embodiment 8, wherein the carbon is mixed and the lightness is lower than that when there is no mixing.

[0026] According to the cured body of Embodiment 9, the lightness is lower than that of the cured body without the mixed carbon. Therefore, it is possible to manufacture a cured body with a lower lightness, and it is possible to clearly distinguish it from the cured body without the mixed carbon. Therefore, since the cured body can be provided with color variations, it has excellent designability.

[0027] ===Regarding this embodiment=== <<Background of the invention>> Concrete is mainly composed of cement, water, aggregates (fine aggregates, coarse aggregates), admixtures, etc., and is manufactured by the hydration reaction of water with cement and the like. Among the constituent materials of concrete, especially when cement is manufactured, a large amount of carbon dioxide (CO2), which is a greenhouse gas, is emitted. Since the increase in the concentration of carbon dioxide causes global warming, it is required to reduce the amount of carbon dioxide emissions.

[0028] In addition, for example, wooden waste materials (hereinafter referred to as wooden waste materials) generated at construction sites such as plywood for concrete formwork are discarded and incinerated without being reused after use. It is required to recycle waste materials generated at construction sites from the perspective of resource circulation, not to mention reducing the amount of carbon dioxide emissions by incineration.

[0029] In this embodiment, wooden waste materials generated at construction sites are carbonized in an environment where they are not combined with oxygen as much as possible without incineration to produce charcoal, and the produced charcoal is mixed with binders such as cement, blast furnace slag fine powder, fly ash, amorphous powder, and alkali activator to manufacture a cured body. A method for manufacturing a cured body and the cured body manufactured by this manufacturing method will be described.

[0030] <<Method for manufacturing a cured body of this embodiment>> The cured body of this embodiment contains charcoal derived from wooden waste materials when it is manufactured by mixing and kneading a binder, water, aggregates (fine aggregates, coarse aggregates), and an admixture. At this time, a part of the binder may be blast furnace slag fine powder, and the cured body may be cement paste and mortar. Further, the binder is not limited to cement, and may be blast furnace slag fine powder, fly ash, amorphous powder, alkali activator, etc.

[0031] Figure 1 is a flowchart showing the method for manufacturing a cured body of this embodiment. As shown in FIG. 1, the method for manufacturing a cured body according to this embodiment first includes a carbon manufacturing step (S1) of collecting wood waste used at various construction sites at a factory or the like and carbonizing it in an environment where it is not combined with oxygen as much as possible to produce carbon, and a cured body manufacturing step (S2) of using cement as a binder and using the produced carbon as part of the aggregate to produce concrete.

[0032] In the carbon manufacturing step (S1), wood waste formed of wood, which is a biological resource, is collected at a construction site and heated at a temperature exceeding 350°C under an oxygen concentration controlled to a level where the collected wood waste does not burn, thereby producing carbon. It is desirable that the carbon to be produced has a carbon content of 50% or more.

[0033] In the concrete manufacturing step (S2), the produced carbon is mixed as part of the aggregate into a binder, water, aggregate other than carbon, and admixture and kneaded to produce concrete. At this time, by adjusting the admixture so that the kneading time is within 20 minutes, the produced concrete can be efficiently supplied.

[0034] For example, in the fresh properties of the concrete to be produced, the slump is desirably set within ±2.5 cm of a specified slump, where the specified slump is a value at which a desired fluidity is obtained in the concrete. Also, when the fluidity of the concrete to be produced is high, it is desirable to set it within ±10.0 cm of a specified slump flow, where the specified slump flow is the value of the desired slump flow in the concrete.

[0035] In the method for manufacturing concrete (hardened body) of this embodiment, wood waste generated at the construction site is carbonized in an environment where it is not combined with oxygen as much as possible without incineration to produce charcoal. Therefore, since the wood waste is not discarded, the amount of wood waste discarded is reduced, and at the same time, the emission of CO2 due to combustion is suppressed, and it becomes possible to contain a large amount of carbon in the charcoal. And since the manufactured charcoal is mixed to produce concrete, it becomes possible to contain more carbon in the concrete. Therefore, it is possible to reduce the amount of wood waste discarded and also reduce the amount of CO2 emissions.

[0036] Also, by increasing the amount of charcoal mixed during concrete production to more than 0 kg / m 3 it becomes possible to surely contain more carbon, and by setting the amount of charcoal mixed to 100 kg / m or less 3 it becomes possible to produce concrete mixed with charcoal with a mixing time of, for example, within 20 minutes without requiring a long mixing time.

[0037] Also, the concrete mixed with charcoal has a lower lightness than the concrete without charcoal mixed. Therefore, it is possible to produce concrete with a clearly different color tone from the concrete without charcoal mixed. For this reason, it is possible to provide color variations in the concrete, so it is also excellent in design.

[0038] <<Example>> In this example, a confirmation test was conducted on the fresh properties and strength characteristics of specimens (concrete and ready-mixed concrete) mixed with charcoal produced by carbonizing wood waste. The test items and test methods are shown in Figure 2.

[0039] <Test 1: Comparison based on the presence or absence of charcoal contained as an admixture> Figure 3 is a diagram showing the conditions in Test 1. Example 1 (N-BI small 25) and Example 2 (N-BI small 50) and Comparative Example 1 (N-Base) are all concretes with a water-cement ratio of 55%, and the amount of carbon mixed in the fine aggregate to be mixed is different. As shown in Fig. 3, the amount of carbon mixed in Examples 1 and 2 is 25 kg / m for Example 1 3 , 50 kg / m for Example 2 3 .

[0040] · Specimen Specimens of concrete mixed with carbon were prepared. Water: Tap water Cement: Ordinary Portland cement (density 3.16 g / cm 3 ) Admixture: Carbon (granular about 0.1 mm, density 1.6 g / cm 3 , carbon content 67.1%) Fine aggregate: River sand (produced in Kakegawa, Shizuoka Prefecture, surface density 2.57 g / cm 3 , fineness modulus 67.7% water absorption 2.53%, coarse particle ratio 2.59) Coarse aggregate: Hard sandstone 2005 (produced in Chichibu, surface density 2.72 g / cm 3 , fineness modulus 58.8%, water absorption 0.59%, coarse particle ratio 6.76) Chemical admixture: High-performance AE water reducer

[0041] Fig. 3 is a diagram showing the fresh properties of specimens (concretes) of Example 1 (N-BI small 25), Example 2 (N-BI small 50), and Comparative Example 1 (N-Base). These specimens were mixed with concrete using a two-axis forced mixer in a thermo-hygrostat (20 °C, 60% RH). After putting in the coarse aggregate, fine aggregate, admixture (BI), and cement and mixing for 10 seconds, water containing the admixture was added and mixed.

[0042] The mixing time is determined by adjusting the amount of chemical admixture so that the median value of the desired slump of the concrete is the specified slump, the slump of the concrete is within ±2.5 cm of the specified slump (e.g., 21.0 cm), the median value of the desired slump flow of the concrete is the specified slump flow, the slump flow of the concrete is within ±10.0 cm of the specified slump flow, and the mixing time is efficiently manufacturable in actual use, for example, within 20 minutes.

[0043] The fresh property test was carried out on the concrete in the state immediately after mixing, and the strength property test was carried out after the end of each curing period of 7 days and 28 days of age.

[0044] · Test results <Fresh property test> Figure 4 shows the results of the fresh property test, Figure 5 shows the relationship between the mixing amount of carbon replaced with a part of the fine aggregate and the addition amount of the chemical admixture added to obtain the desired slump and the desired slump flow, and Figure 6 shows the relationship between the mixing amount of carbon replaced with a part of the fine aggregate and the mixing time when kneaded with the addition of the chemical admixture to obtain the desired slump and the desired slump flow.

[0045] As shown in Figure 5, it was confirmed that as the mixing amount of carbon increased from 0 kg / m 3 to 25 kg / m 3 to 50 kg / m 3 , the addition amount of the chemical admixture increased.

[0046] As shown in Figure 6, it was confirmed that as the mixing amount of carbon increased from 0 kg / m 3 to 25 kg / m 3 to 50 kg / m 3 , the mixing time became longer. Also, when the addition amount of the chemical admixture was the amount shown in Figure 3, it was confirmed that the desired slump and the desired slump flow could be obtained within 20 minutes of the mixing time.

[0047] <Strength property test> Figure 7 shows the relationship between the amount of carbon mixed in replacing a part of the fine aggregate and the compressive strength. Figure 8 shows the compressive strength ratios of Examples 1 and 2 to Comparative Example 1. Figure 9 shows the relationship between the amount of carbon mixed in replacing a part of the fine aggregate and the Young's modulus. Figure 10 shows the relationship between the compressive strength and the Young's modulus of the carbon replacing a part of the fine aggregate. As shown in Figures 7 and 8, it was confirmed that the compressive strength was enhanced by mixing carbon.

[0048] As shown in Figure 9, it was confirmed that the Young's modulus, which is an index in concrete structures, was almost the same for Examples 1 and 2 as for Comparative Example 1, and it was confirmed that it was suitable for concrete structures.

[0049] In the relationship between the compressive strength and the Young's modulus, concrete is required to be in the range of 0.8 to 1.2 times in the NewRC formula (Formula 1). Y = k1 × k2 × 33.5 × (γ / 2.4) 2 × (X / 60) 1 / 3 ···(Formula 1) Y: Young's modulus k1: Correction coefficient determined by the type of coarse aggregate k2: Correction coefficient determined by the type of admixture γ: Unit volume mass of concrete (t / m 3 ) As shown in Figure 10, it was confirmed that Examples 1 and 2 were in the range of 0.8 to 1.2 times in the NewRC formula (Formula 1), similar to Comparative Example 1.

[0050] <Test 2: Comparison by the presence or absence of carbon in concrete with blast furnace slag micro powder added as an admixture> Figure 11 is a diagram showing the conditions in Test 2. Example 3 (CC-BI small 25), Example 4 (CC-BI small 50), and Comparative Example 2 (CC-Base) are all concretes with a water binder ratio of 55%. They are different from Test 1 in that a part of the cement is replaced by fine blast furnace slag powder. Also, in Example 3, Example 4, and Comparative Example 2, the amount of carbon mixed in the fine aggregate to be mixed is different. As shown in Fig. 11, the amount of carbon mixed in Example 3 and 4 is 25 kg / m 3 for Example 3 and 50 kg / m 3 for Example 4.

[0051] · Specimen Specimens of concrete with carbon mixed in were prepared. Water: Tap water Cement: Ordinary Portland cement (density 3.16 g / cm 3 ) Admixture: Fine blast furnace slag powder (density 2.89 g / cm 3 ) Carbon (granular, about 0.1 mm, density 1.67 g / cm 3 , carbon content 67.1%) Fine aggregate: River sand (produced in Kakegawa, Shizuoka Prefecture, surface density 2.59 g / cm 3 , performance rate 67.8% water absorption rate 2.53%, coarse grain rate 2.59) Coarse aggregate: Hard sandstone 2005 (produced in Chichibu, surface density 2.72 g / cm 3 , performance rate 57.6%, water absorption rate 0.48%, coarse grain rate 6.61) Chemical admixture: High-performance AE water reducer

[0052] Fig. 12 is a diagram showing the fresh properties of specimens (concretes) of Example 3 (CC-BI small 25) and Example 4 (CC-BI small 50) and Comparative Example 2 ((CC-Base). These specimens were mixed with concrete using a two-axis forced mixer in a thermo-hygrostat chamber (20°C, 60% RH). After putting in the coarse aggregate, fine aggregate, admixture (BS or BI), and cement and mixing for 10 seconds, water containing the admixture was added and mixed.

[0053] The mixing time is determined by adjusting the amount of chemical admixture so that the median value of the desired slump of the concrete is taken as the specified slump, the slump of the concrete is within ±2.5 cm of the specified slump (for example, 21.0 cm), the median value of the desired slump flow of the concrete is taken as the specified slump flow, the slump flow of the concrete is within ±10.0 cm of the specified slump flow, and the mixing time is efficient for actual use and can be within, for example, 20 minutes.

[0054] Fresh property tests were carried out on the concrete in the state immediately after mixing, and strength property tests were carried out after the end of each curing period of 7 days and 28 days of age.

[0055] · Test results <Fresh property test> Figure 12 shows the results of the fresh property test on the concrete in which part of the cement was replaced with fine blast furnace slag powder. Figure 13 shows the relationship between the mixing amount of carbon replaced with part of the fine aggregate and the addition amount of the chemical admixture added to obtain the desired slump and the desired slump flow. Figure 14 shows the relationship between the mixing amount of carbon replaced with part of the fine aggregate and the mixing time when the chemical admixture was added and mixed to obtain the desired slump and the desired slump flow.

[0056] Even in the concrete in which part of the cement was replaced with fine blast furnace slag powder, as shown in Figure 13, it was confirmed that as the mixing amount of carbon increased from 0 kg / m 3 , 25 kg / m 3 , 50 kg / m 3 , the addition amount of the chemical admixture increased.

[0057] Even in the concrete in which part of the cement was replaced with fine blast furnace slag powder, as shown in Figure 14, when the mixing amount of carbon was 0 kg / m 3 , 25 kg / m 3 , 50 kg / m 3It was also confirmed that the kneading time became longer as the amount increased. Further, when the addition amount of the chemical admixture was the amount shown in Fig. 11, it was confirmed that a desired slump and a desired slump flow could be obtained within 20 minutes of kneading time.

[0058] <Strength characteristic test> Figs. 15 to 18 show the results of the strength characteristic test in concrete in which part of the cement was replaced with fine blast furnace slag powder. Fig. 15 shows the relationship between the mixing amount of carbon replaced with part of the fine aggregate and the compressive strength. Fig. 16 shows the compressive strength ratio of Examples 3 and 4 to Comparative Example 2. Fig. 17 shows the relationship between the mixing amount of carbon replaced with part of the fine aggregate and the Young's modulus. Fig. 18 shows the relationship between the compressive strength and the Young's modulus in carbon replaced with part of the fine aggregate.

[0059] As shown in Figs. 15 and 16, it was confirmed that in the concrete in which part of the cement was replaced with fine blast furnace slag powder, compressive strength equivalent to that of the concrete without carbon incorporation was obtained.

[0060] As shown in Fig. 17, the Young's modulus, which is an index in the structure, was confirmed to be almost the same for Examples 3 and 4 of the concrete in which part of the cement was replaced with fine blast furnace slag powder as that of Comparative Example 2, and it was confirmed to be suitable for concrete structures.

[0061] As shown in Fig. 18, it was confirmed that Examples 3 and 4 of the concrete in which part of the cement was replaced with fine blast furnace slag powder were in the range of 0.8 to 1.2 times in the NewRC formula (Formula 1), similar to Comparative Example 2.

[0062] <Test 3: Comparison based on difference in carbon content in concrete with fine blast furnace slag powder added as admixture> Fig. 19 is a diagram showing the conditions in Test 3. Example 5 (CC-BI small 75), Example 6 (CC-BI small 100), and Comparative Example 3 (CC-Base) are all concretes with a water binder ratio of 55%, and more carbon is added than in Test 2. And in Example 5, Example 6, and Comparative Example 3, the amount of carbon mixed in the fine aggregate to be mixed is different. As shown in Fig. 19, the amount of carbon mixed in Examples 5 and 6 is 75 kg / m for Example 5 3 , and 100 kg / m for Example 6 3 .

[0063] · Specimen Specimens of concrete mixed with carbon were prepared. Water: Tap water Cement: Ordinary Portland cement (density 3.16 g / cm 3 ) Admixture: Blast furnace slag fine powder (density 2.89 g / cm 3 ) Carbon (granular, about 0.1 mm, density 1.67 g / cm 3 , carbon content 67.1%) Fine aggregate: River sand (produced in Kakegawa, Shizuoka Prefecture, surface density 2.59 g / cm 3 , performance rate 67.8% water absorption rate 2.53%, coarse grain rate 2.59) Coarse aggregate: Hard sandstone 2005 (produced in Chichibu, surface density 2.72 g / cm 3 , performance rate 57.6%, water absorption rate 0.48%, coarse grain rate 6.61) Chemical admixture: High-performance AE water reducer

[0064] Fig. 20 is a diagram showing the fresh properties of specimens (concretes) of Example 5 (CC-BI small 75) and Example 6 (CC-BI small 100) and Comparative Example 3 ((CC-Base). These specimens were mixed with concrete using a two-axis forced mixer in a thermo-hygrostat (20 °C, 60% RH). After putting in the coarse aggregate, fine aggregate, admixture (BS or BI), and cement and mixing for 10 seconds, water containing the admixture was added and mixed.

[0065] The mixing time is determined by adjusting the amount of chemical admixture so that the median value of the desired slump of the concrete is the specified slump, the slump of the concrete is within ±2.5 cm of the specified slump (for example, 21.0 cm), the median value of the desired slump flow of the concrete is the specified slump flow, the slump flow of the concrete is within ±10.0 cm of the specified slump flow, and the mixing time is efficiently manufacturable in actual use, for example, within 20 minutes.

[0066] The concrete was subjected to a fresh property test in the state of ready-mixed concrete after mixing, and a strength property test was carried out after the end of each curing period of 7 days and 31 days of age.

[0067] · Test results <Fresh property test> Figure 21 shows the results of the fresh property test for concrete in which part of the cement was replaced with fine blast furnace slag powder and the amount of carbon admixture was increased. Figure 21 shows the relationship between the amount of carbon admixture increased by replacing part of the fine aggregate and the amount of chemical admixture added to obtain the desired slump and the desired slump flow. Figure 14 shows the relationship between the amount of carbon admixture increased by replacing part of the fine aggregate and the mixing time when the chemical admixture was added and mixed to obtain the desired slump and the desired slump flow.

[0068] Even in the case of concrete in which part of the cement was replaced with fine blast furnace slag powder and the amount of carbon admixture was increased, as shown in Figure 21, when the amount of carbon admixture was 0 kg / m 3 , 75 kg / m 3 , 100 kg / m 3 It was confirmed that the amount of chemical admixture added increased as the amount increased.

[0069] Even in the case of concrete in which part of the cement was replaced with fine blast furnace slag powder and the amount of carbon admixture was increased, as shown in Figure 22, when the amount of carbon admixture was 0 kg / m 3 , 75 kg / m 3 , 100 kg / m 3It was also confirmed that the kneading time became longer as the amount increased. Further, when the addition amount of the chemical admixture was the amount shown in Fig. 19, it was confirmed that a desired slump and a desired slump flow could be obtained within 20 minutes of the kneading time.

[0070] <Strength characteristic test> Figs. 23 to 26 show the results of strength characteristic tests on concrete in which part of the cement was replaced with fine blast furnace slag powder and the amount of carbon mixed was increased. Fig. 23 shows the relationship between the amount of carbon mixed replacing part of the fine aggregate and the compressive strength. Fig. 24 shows the compressive strength ratios of Examples 3 and 4 to Comparative Example 2. Fig. 25 shows the relationship between the amount of carbon mixed replacing part of the fine aggregate and the Young's modulus. Fig. 26 shows the relationship between the compressive strength and the Young's modulus of the carbon replacing part of the fine aggregate.

[0071] As shown in Figs. 23 and 24, it was confirmed that in the concrete in which part of the cement was replaced with fine blast furnace slag powder and the amount of carbon mixed was increased, a compressive strength equivalent to that of the concrete without carbon mixed was obtained.

[0072] As shown in Fig. 25, the Young's modulus, which is an index in the structure, was confirmed to be almost the same for Examples 5 and 6 of the concrete in which part of the cement was replaced with fine blast furnace slag powder and the amount of carbon mixed was increased as that of Comparative Example 3, and it was confirmed to be suitable for concrete structures.

[0073] As shown in Fig. 26, it was confirmed that Examples 5 and 6 of the concrete in which part of the cement was replaced with fine blast furnace slag powder and the amount of carbon mixed was increased were in the range of 0.8 to 1.2 times in the NewRC formula (Formula 1), similar to Comparative Example 3.

[0074] As described above, the above embodiments are for facilitating the understanding of the present invention and are not for limiting and interpreting the present invention. It goes without saying that the present invention can be changed and improved without departing from its gist, and equivalents thereof are included in the present invention.

[0075] <Test 4: Comparison of brightness due to differences in carbon content in concrete with addition of fine blast furnace slag powder as admixture> Figure 27 is a diagram showing the conditions in Test 4. In Test 4, for three types of mortar (Examples 7 to 9) with different mixing ratios (mass ratios) of binder, the brightness was measured with the carbon content (converted as concrete) being 0 kg / m 3 , 50 kg / m 3 , 100 kg / m 3 respectively. Figure 28 shows the results of Test 4. The brightness is indicated by values from 0 to 100, with higher brightness indicating white and lower brightness indicating black.

[0076] As shown in Figure 28, it was confirmed that in any of Examples 7 to 9, the brightness decreased as the carbon content increased.

Claims

1. A method for manufacturing a hardened body, comprising: a step of manufacturing charcoal from wood waste generated at a construction site; and a step of manufacturing a hardened body mixed with the charcoal.

2. The method for manufacturing a hardened body according to Claim 1, wherein the kneading time in the step of manufacturing a hardened body mixed with the charcoal is within 20 minutes.

3. The method for manufacturing a hardened body according to Claim 1 or Claim 2, wherein the slump in the fresh state of the hardened body is within ±2.5 cm of the specified slump of the hardened body.

4. The method for manufacturing a hardened body according to Claim 1 or Claim 2, wherein the slump flow in the fresh state of the hardened body is within ±10.0 cm of the specified slump flow of the hardened body.

5. The method for manufacturing a hardened body according to Claim 1 or Claim 2, wherein the charcoal has a carbon content of 50% or more.

6. The method for manufacturing a hardened body according to Claim 1 or Claim 2, The mixing amount of the carbon is more than 0 kg / m ３ and not more than 100 kg / m ３ The method for producing a cured body is characterized by the above.

7. The method for manufacturing a hardened body according to Claim 1 or Claim 2, wherein the mixing ratio of the binder of the hardened body is cement: blast furnace slag fine powder = 25 to 100: 75 to 0 by mass ratio.

8. A hardened body comprising charcoal derived from wood waste generated at a construction site and a binder.

9. The hardened body according to Claim 8, wherein the charcoal is mixed in and the brightness is lower than that without mixing.

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