Hydraulic materials

Abstract

To provide a hydraulic material that can produce high-strength mortar without using cement.SOLUTION: The hydraulic material comprises a copper slag powder and an alkaline stimulant. It is preferable that the specific surface area of the copper slag powder is 4000 cm2 / g or more and 8000 cm2 / g or less. It is preferable that the ratio of the mass of alkaline stimulant to the mass of 100 mass% of copper slag powder is 5 mass% or more in outer percentage. As alkali stimulant, one or more of alkali hydroxide, alkali silicate, alkali carbonate, and alkali borate can be used.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a hydraulic material. [Background technology]

[0002] The following Patent Document 1 describes a hydraulic material (i.e., a mortar material) containing cement and copper slag powder. The same document also describes the production of high-strength mortar by kneading and mixing this hydraulic material with water.

[0003] By the way, a cement burning process is necessary to produce cement. This process emits a large amount of carbon dioxide. Meanwhile, in recent years, there has been a demand to reduce carbon dioxide emissions. However, when cement is not used as a hydraulic material, the strength of the mortar obtained from the hydraulic material tends to be insufficient. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2006-315883 A Summary of the Invention [Problem to be solved by the invention]

[0005] As a result of various research conducted by the inventors on this point, they discovered that by mixing an alkaline stimulant with copper slag powder, it is possible to obtain a high-strength mortar without using cement. The present invention was made based on this discovery, and aims to provide a hydraulic material that can produce a high-strength mortar without using cement. [Means for solving the problem]

[0006] The hydraulic material according to the first aspect of the present invention contains copper slag powder and an alkaline stimulant. According to the first aspect, the alkaline stimulant can impart hydraulic properties to the copper slag powder. This makes it possible to manufacture high-strength mortar without using cement. This will be described in detail in the test examples below. As the alkaline stimulant, for example, one or more of an alkali hydroxide, an alkali silicate, an alkali carbonate, and an alkali borate can be used.

[0007] The hydraulic material according to the second aspect of the present invention is a copper slag powder having a specific surface area of ​​4000 cm 2 / g or more 8000cm 2 / g or less. According to the second item, the copper slag powder can be given stronger hydraulic properties by the alkaline stimulant. This makes it possible to manufacture a mortar with even higher strength. This point will be explained in detail in the test example described later.

[0008] The hydraulic material according to the third aspect of the present invention is one in which the mass ratio of the alkali stimulant to the mass of the copper slag powder (100 mass%) is 5 mass% or more. According to the third aspect, the alkali stimulant can impart stronger hydraulic properties to the copper slag powder. This allows the production of a mortar with even higher strength. This will be described in detail in the test examples below. Effect of the Invention

[0009] As described above, according to the present invention, a high-strength mortar can be produced without using cement. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a graph showing the results of a test example of a hydraulic material according to one embodiment of the present invention, showing the relationship between the mixing ratio of the alkaline irritant and the compressive strength of the mortar. [Diagram 2]FIG. 2 is a graph showing the results of a test example of a hydraulic material according to one embodiment of the present invention, showing the relationship between the specific surface area of ​​copper slag powder and the compressive strength of mortar. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] A hydraulic material according to one embodiment of the present invention will be described. This hydraulic material contains copper slag powder and an alkali stimulant. As the alkali stimulant, for example, one or more of an alkali hydroxide, an alkali silicate, an alkali carbonate, and an alkali borate can be used. Specifically, sodium hydroxide can be used as the alkali hydroxide, or water glass can be used as the alkali silicate, but the present invention is not limited to these.

[0012] In order to manufacture a high-strength mortar by mixing the hydraulic material according to this embodiment with water, the specific surface area of ​​the copper slag powder must be 4000 cm 2 / g or more 8000cm 2 / g or less, and this specific surface area is preferably 5110 cm 2 / g or more 7880cm 2 / g or less is even more preferable. In this specification, the specific surface area means the specific surface area measured using a Blaine air permeation device. The specific method for measuring this specific surface area is specified in the Japanese Industrial Standard JIS R 5201 "Physical Testing Methods for Cement".

[0013] In order to produce a high-strength mortar by mixing the hydraulic material of this embodiment with water, it is preferable that the mass ratio of the alkaline irritant to 100% by mass of the copper slag powder is 5% by mass or more, and it is even more preferable that this ratio is 10% by mass or more.

[0014] Next, test examples (Test Examples 1 to 6) of the hydraulic material according to one embodiment of the present invention will be described. In these test examples, the compressive strength of a specimen obtained from a mixture of hydraulic material (mixture of copper slag powder and alkaline activator), fine aggregate, and water was measured with reference to JIS R 5201 "Physical Testing Methods for Cement".

[0015] Specifically, the test was carried out as follows. First, an alkaline stimulant dissolved in water was added to a Hobart mixer (manufactured by Hobart Japan Co., Ltd.). Next, copper slag powder was added to the Hobart mixer to prepare a hydraulic material. Then, the Hobart mixer was operated in low-speed mode (rotation speed: 140 rpm for rotation, 62 rpm for revolution) for 30 seconds to mix the hydraulic material and water. Here, fine aggregate was added to the Hobart mixer while operating in low-speed mode. Furthermore, the Hobart mixer was operated in medium-speed mode (rotation speed: 285 rpm for rotation, 125 rpm for revolution) for 30 seconds to mix the hydraulic material, fine aggregate, and water. After the 30 seconds had elapsed, the operation of the Hobart mixer was stopped. Then, the mixture (hydraulic material, fine aggregate, and water mixture) attached to the paddle of the Hobart mixer was scraped off from the paddle and the mixer was left on standby for 75 seconds. Then, the Hobart mixer was operated in a medium speed mode for 1 minute to mix the hydraulic material, the fine aggregate, and the water. Then, the operation of the Hobart mixer was stopped and the kneaded material was taken out from the Hobart mixer.

[0016] The material composition in this test was as follows: copper slag powder 450 g, alkaline irritant in a mass that was a specified ratio to the copper slag powder, fine aggregate 1350 g, and water in a mass that was 50% of the total mass of the copper slag powder.

[0017] Further, the triple-frame was placed on the table vibrator. Here, each frame in the triple-frame was formed into a rectangular parallelepiped with a length of 16 cm, a width of 4 cm, and a height of 4 cm. In addition, only the top surface of each frame was open. Next, while vibrating the table vibrator, the kneaded material taken out from the Hobart mixer was filled into each frame in the triple-frame with a spoon in a range of 0 cm to 2 cm in height for 15 seconds. After that, the table vibrator was kept vibrating and the frame was left standing for 15 seconds. Then, the kneaded material taken out from the Hobart mixer was filled into each frame in the triple-frame with a spoon in a range of 2 cm to 4 cm in height for 15 seconds. After that, the table vibrator was kept vibrating and the frame was left standing for 75 seconds.

[0018] Here, the vibration of the table vibrator was stopped. After that, the kneaded material that protruded upward from the upper surface of each formwork in the triple formwork was scraped off using a trowel. Furthermore, the upper surface of each formwork in the triple formwork was blocked with a flat plastic plate. Then, the kneaded material filled in the triple formwork was cured for 24 hours in an environment of 20°C. Then, the hardened kneaded material was steam cured and then demolded to obtain a geopolymer hardened body. Specifically, for the steam curing, the hardened kneaded material was heated from room temperature to 80°C over 3 hours, held in an environment of 80°C for 5 hours, and cooled from 80°C to room temperature over 3 hours. Furthermore, this geopolymer hardened body was cured under high temperature and high pressure conditions using an autoclave curing device. Specifically, for the autoclave curing, the geopolymer hardened body was heated from room temperature to 180°C over 3 hours, held in an environment of 180°C and 10 atm for 5 hours, and cooled from 180°C to room temperature over 3 hours. The compressive strength of the hardened geopolymer (test specimen) was then measured with reference to JIS R 5201 "Physical testing methods for cement."

[0019] [Table 1]

[0020] Table 1 shows the specific surface area (cm2) of the copper slag powder charged into the Hobart type mixer in Test Examples 1 to 3. 2 / g), the type of alkaline irritant charged into the Hobart mixer, the ratio (mass%) of the mass of the alkaline irritant to 100 mass% of the copper slag powder charged into the Hobart mixer, and the compressive strength (N / mm 2 ) relationship.

[0021] FIG. 1 shows the relationship between the ratio (mass%) and the compressive strength (N / mm 2 ) in the range where the ratio is 5 mass% or more. 2 Furthermore, when the ratio is 10% by mass or more, the compressive strength exceeds the standard design strength for concrete structures of 24 N / mm 2 Moreover, there is a positive correlation between the ratio and the compressive strength.

[0022] Therefore, the following conclusion can be drawn from the results shown in FIG. 1. According to a hydraulic material containing copper slag powder and an alkaline activator, the alkaline activator can impart hydraulic properties to the copper slag powder. Therefore, by mixing this hydraulic material with water, a high-strength mortar can be produced without using cement. Here, when the above ratio is 5 mass% or more, the above compressive strength is 5 N / mm 2 In addition, when the above ratio is 10 mass% or more, the above compressive strength exceeds 24 N / mm 2 Exceeds.

[0023] [Table 2]

[0024] Table 2 shows the specific surface area (cm2) of the copper slag powder charged into the Hobart type mixer in Test Examples 2, 4 and 5. 2 / g), the type of alkaline irritant charged into the Hobart mixer, the ratio (mass%) of the mass of the alkaline irritant to 100 mass% of the copper slag powder charged into the Hobart mixer, and the compressive strength (N / mm 2 ) relationship.

[0025] FIG. 2 shows the specific surface area (cm 2 / g) and the above compressive strength (N / mm 2 The compressive strength is a function of the specific surface area of ​​5110 cm. 2 / g or more 7880cm 2 Within the range of 24N / mm2 / g, the design strength (standard) of concrete structures is 24N / mm2 2 The above compressive strength is preferably greater than the above specific surface area of ​​5110 cm 2 / g or more 7880cm 2 / g or less, the specific surface area is almost constant regardless of the specific surface area. 2 / g or more 8000cm 2 / g or less, the compressive strength is not significantly reduced and is considered to be within a sufficiently practical range.

[0026] Therefore, the following conclusions can be drawn from the results shown in Figure 2. The specific surface area of ​​the copper slag powder is 4000 cm 2 / g or more 8000cm 2 If the specific surface area is 5110 cm2 or less, the compressive strength of the mortar produced from the hydraulic material containing the copper slag powder and the alkali stimulant can be kept within a practical range. 2 / g or more 7880cm 2 / g or less, the compressive strength of this mortar is 24 N / mm 2 Exceeds.

[0027] [Table 3]

[0028] Table 3 shows the specific surface area (cm2) of the copper slag powder charged into the Hobart type mixer in Test Examples 2 and 6. 2 / g), the type of alkaline irritant charged into the Hobart mixer, the ratio (mass%) of the mass of the alkaline irritant to 100 mass% of the copper slag powder charged into the Hobart mixer, and the compressive strength (N / mm 2 ) relationship.

[0029] As shown in Table 3, in Test Examples 2 and 6, the specific surface area and the ratio are the same, but the type of alkaline irritant is different. However, in both Test Example 2, in which water glass (alkali silicate) was used as the alkaline irritant, and Test Example 6, in which sodium hydroxide (alkali hydroxide) was used as the alkaline irritant, the compressive strength was 24 N / mm 2 It is believed that similar results can be obtained by using alkali carbonate or alkali borate as an alkaline irritant.

[0030] Therefore, the following conclusion can be drawn from the results shown in Table 3. In a hydraulic material containing copper slag powder and an alkaline stimulant, whether an alkali hydroxide, an alkali silicate, an alkali carbonate, or an alkali borate is used as the alkaline stimulant, the alkaline stimulant can give hydraulic properties to the copper slag powder. Therefore, by mixing this hydraulic material with water, a high-strength mortar can be produced without using cement.

Claims

1. It consists of copper slag powder and an alkaline stimulant, The alkaline irritant is water glass or sodium hydroxide; And does not contain cement A hydraulic material characterized by:

2. The specific surface area of ​​the copper slag powder is 4000 cm 2 / g or more 8000cm 2 / g or less of the hydraulic material according to claim 1.

3. 3. The hydraulic material according to claim 1, wherein the mass ratio of the alkaline irritant to 100% by mass of the copper slag powder is 5% by mass or more.

4. 3. The hydraulic material according to claim 1, wherein the mass ratio of the alkaline irritant to 100% by mass of the copper slag powder is 10% by mass or more.

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