Repair methods for sediment control dams, filling materials, slag-based slow-setting injection materials, and slag-based instant-setting injection materials

Abstract

We provide technology that can reduce carbon dioxide emissions during the repair of sediment control dams. [Solution] A repair method comprising at least the steps of drilling a borehole 24 to a predetermined depth in the vertical direction from the top surface 20 of the sediment control dam 10, and inserting a filling pipe 26 into the formed borehole 24, and filling the cavity 12 inside the sediment control dam 10 with the filling material by pulling up the filling pipe 26 while discharging the filling material from the opening of the filling pipe 26, wherein the filling material consists of a substance mainly composed of blast furnace slag to which a weighting agent consisting of at least water and barium sulfate is added.

Description

Technical Field

[0001] The present invention relates to a repair method for erosion control dams, and particularly relates to a technique for filling voids inside an aged erosion control dam.

Background Art

[0002] Erosion control dams of rubble concrete structure constructed around 1945 to 1955 shortly after the post-war period are generally of low quality, and nearly 80 years after their construction, serious problems such as horizontal cracks and collapse of masonry have now occurred (see Figure 26). For this reason, repair work has been carried out to fill voids generated inside erosion control dams due to aging deterioration with cement milk or the like.

[0003]

Non-Patent Document 1

Non-Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] By implementing these repair works, it is certainly possible to fill the voids inside the erosion control dam and restore water cutoff performance. However, it has been pointed out that cement used as a void filling material cannot meet the recent demand for carbon neutrality, since a large amount of carbon dioxide that causes global warming is emitted during its production. Furthermore, since cement grout cannot provide the same strength and weight as concrete, the current practice is to compensate for the lack of strength and weight by adding concrete to existing facilities. This not only increases carbon dioxide emissions but also leads to increased costs and longer construction periods. In addition, some sediment control dams that are more than 50 years old are considered historical structures and require the preservation of their landscape. In such cases, adding concrete can damage the landscape.

[0005] This invention was devised in light of the current situation and aims to provide a technology that can reduce carbon dioxide emissions when repairing sediment control dams. [Means for solving the problem]

[0006] To achieve the above objective, the repair method for a sediment control dam described in claim 1 comprises at least the steps of drilling a borehole to a predetermined distance from the surface of the sediment control dam and filling the void inside the sediment control dam with the filling material by discharging a filling material into the formed borehole, wherein the filling material is composed of a substance mainly made of blast furnace slag, blast furnace slag cement, or cement, to which a weighting agent consisting of at least water and sulfate is added. The above-mentioned "sulfates" include barium sulfate, calcium sulfate, aluminum sulfate, strontium sulfate, magnesium sulfate, and manganese sulfate.

[0007] The repair method for a sediment control dam described in claim 2 is a method that adds the steps of drilling again to a predetermined distance from the surface of the sediment control dam after filling the gap with a filler material in the method of claim 1, and filling the cracks inside the sediment control dam with a slag-based loosening injection material by discharging a slag-based loosening injection material into the formed borehole, characterized in that the slag-based loosening injection material is composed of a substance mainly made of blast furnace slag to which a dispersant consisting of at least water and a polymer compound is added.

[0008] The repair method for a sediment control dam described in claim 3 is a method in which, prior to the method of claim 1 or 2, a borehole is drilled diagonally from the surface of the sediment control dam along the upstream side wall and / or the downstream side wall to a predetermined distance, and a slag-based instant-setting injection material is discharged into the formed borehole to form a liquid leakage prevention layer on the inside of the upstream side wall and / or the downstream side wall, characterized in that the slag-based instant-setting injection material is composed mainly of blast furnace slag to which at least water, hydroxide and carbonate are added. Examples of the above-mentioned "hydroxides" include slaked lime, boric acid, sodium hydroxide, magnesium hydroxide, potassium hydroxide, tin(II) hydroxide, iron(II) hydroxide, and strontium hydroxide. Examples of "carbonates" include potassium carbonate, sodium carbonate, calcium carbonate, zinc carbonate, lithium carbonate, nickel(II) carbonate, and ammonium carbonate.

[0009] The repair method for a sediment control dam described in claim 4 is characterized by forming an additional concrete layer on the downstream side wall of the sediment control dam after the construction of the methods described in claims 1 to 3.

[0010] The repair method for a sediment control dam described in claim 5 comprises the steps of: drilling a predetermined distance diagonally from the surface of the sediment control dam along the upstream side wall and / or the downstream side wall; discharging a slag-based quick-setting injection material into each formed borehole to form a liquid leakage prevention layer on the inside of the upstream side wall and / or the downstream side wall; drilling a predetermined distance from the surface of the sediment control dam; discharging a slag-based slow-setting injection material into each formed borehole to fill cavities and cracks in the sediment control dam with the slag-based slow-setting injection material; and forming an additional concrete layer on the downstream side wall of the sediment control dam, wherein the slag-based quick-setting injection material is composed of a substance mainly made of blast furnace slag to which at least water, hydroxide and carbonate are added, and the slag-based slow-setting injection material is composed of a substance mainly made of blast furnace slag to which at least water and a dispersant consisting of a polymer compound are added.

[0011] Furthermore, the filler described in claim 6 is characterized by comprising a substance mainly composed of blast furnace slag, blast furnace slag cement, or cement, to which a weighting agent consisting of at least water and sulfate is added.

[0012] The slag-based loosening-type injection material described in claim 7 is characterized by comprising a substance mainly composed of blast furnace slag, to which a dispersant consisting of at least water and a polymer compound is added.

[0013] The slag-based instantaneous injection material described in claim 8 is characterized by comprising a substance mainly composed of blast furnace slag to which at least water, hydroxide, and carbonate are added. [Effects of the Invention]

[0014] In the repair method described in claim 1, since a weighting agent consisting of sulfates with a relatively high specific gravity is added to the filling material used to fill the void, it becomes easier to secure the weight required for a sediment control dam, and as a result, the amount of additional concrete to be poured can be reduced, thereby reducing the amount of carbon dioxide emissions associated with the repair. Furthermore, if blast furnace slag or blast furnace slag cement is used instead of cement as a binder, carbon dioxide emissions can be further reduced.

[0015] According to the repair method described in claim 2, after filling the cavities with a filler material, any remaining fine cracks can be filled with a slag-based loosening injection material, thereby improving the watertightness of the sediment control dam. This slag-based, loosely setting grout uses blast furnace slag as a binder instead of cement, thus contributing to a reduction in carbon dioxide emissions.

[0016] According to the repair method described in claim 3, a liquid leakage prevention layer can be formed in advance on at least one of the upstream and downstream walls of the sediment control dam using a slag-based instant-setting injection material, which is particularly effective when repairing sediment control dams with severe surface damage. Since this slag-based quick-setting grout also uses blast furnace slag as the binder instead of cement, it contributes to the reduction of carbon dioxide emissions.

[0017] According to the repair method described in Claim 4, when the required strength and weight are insufficient after the repair work of the sabo dam, the required strength and weight can be ensured by forming an additional cast concrete layer on the downstream side wall surface of the sabo dam. Even in this case, since most of the weight required for the sabo dam is ensured by the filler containing the weighting agent, the amount of the additional cast concrete can be reduced correspondingly.

[0018] According to the repair method described in Claim 5, after forming a fluid loss prevention layer with the slag-based quick-setting grout on the upstream side wall surface and / or downstream side wall surface of the sabo dam, the cavities and cracks can be collectively filled with the slag-based slow-setting grout. In addition, both the slag-based quick-setting grout and the slag-based slow-setting grout use blast furnace slag as the main component instead of cement, which makes it possible to reduce carbon dioxide emissions accordingly.

[0019] The filler described in Claim 6 is added with a weighting agent composed of sulfate having a relatively large specific gravity, so it is effective for works requiring weight such as the repair of sabo dams. However, its application is not limited to the repair work of sabo dams, and it is naturally possible to use it for other works. In addition, when blast furnace slag or blast furnace slag cement is adopted as the binder instead of cement, carbon dioxide emissions during production can be reduced.

[0020] The slag-based slow-setting grout described in Claim 7 uses blast furnace slag as the binder instead of cement, so it can reduce carbon dioxide emissions during production. Furthermore, since a dispersant composed of a polymer compound is added, high flowability and homogeneity can be exhibited, and there is an advantage that it easily penetrates between existing aggregates during repair of a sabo dam. However, its use is not limited to repair work of sabo dams, and it can also be used for other construction works.

[0021] In the slag-based quick-setting grout material according to claim 8, since blast furnace slag is used instead of cement as a binder, the amount of carbon dioxide emissions during production can be reduced. Furthermore, since hydroxides and carbonates are added, the gel time can be adjusted to be extremely short, and by using this, a liquid leakage prevention layer can be rapidly formed on the surface of a severely damaged sabo dam. However, its use is not limited to repair work of sabo dams, and it can also be used for other construction works. Brief Description of the Drawings

[0022] [Figure 1] This is a conceptual diagram showing a sabo dam to be repaired. [Figure 2] This is a flowchart showing the steps of the first repair method for a sabo dam. [Figure 3] This is a conceptual diagram showing the steps of the first repair method. [Figure 4] This is a conceptual diagram showing the steps of the first repair method. [Figure 5] This is a conceptual diagram showing the steps of the first repair method. [Figure 6] This is a conceptual diagram showing the steps of the first repair method. [Figure 7] This is a mixing table for the slag-based filler material. [Figure 8] This is a mixing table for a conventional cement-based filler material. [Figure 9] This is a mixing table for the slag-based slow-setting grout material. [Figure 10] This is a flowchart showing the steps of the second repair method for a sabo dam. [Figure 11] This is a conceptual diagram showing the steps of the second repair method. [Figure 12]This is a conceptual diagram illustrating the process of the second repair method. [Figure 13] This is a conceptual diagram illustrating the process of the second repair method. [Figure 14] This is a conceptual diagram illustrating the process of the second repair method. [Figure 15] This is a conceptual diagram illustrating the process of the second repair method. [Figure 16] This is a mixing chart for slag-based, quick-setting injection materials. [Figure 17] This is a flowchart showing the process for the third repair method of a sediment control dam. [Figure 18] This is a conceptual diagram illustrating the process of the third repair method. [Figure 19] This is a conceptual diagram illustrating the sixth repair method for sediment control dams. [Figure 20] This table shows the specific surface area of ​​blast furnace slag contained in slag-based fillers, slag-based slow-setting injection materials, and slag-based instant-setting injection materials. [Figure 21] This graph shows the change in unconfined compressive strength of slag-based fillers as the curing period increases. [Figure 22] This graph shows the relationship between the number of days elapsed and the bleeding rate of slag-based fillers. [Figure 23] This graph shows the change in viscosity of slag-based filler over time. [Figure 24] This graph shows the change in flow value of slag-based filler over time. [Figure 25] This graph shows the change in gel time depending on the amount of carbonate added to a slag-based instant-setting injection material. [Figure 26] This is a photograph showing the deteriorated wall surface of a sediment control dam. [Best Mode for Carrying Out the Invention]

[0023] [First repair method] Figure 1 is a schematic diagram showing a cross-section of the sediment control dam 10 to be repaired, and shows numerous cavities 12 caused by the outflow of coarse stones and cracks 14 caused by concrete deterioration inside. The first repair method for this aging sediment control dam 10 will be explained according to the flowchart in Figure 2.

[0024] First, as shown in Figure 3(a), the upstream wall surface 16 and the downstream wall surface 18 of the sediment control dam 10 are treated with caulking to prevent leaks (S10). Specifically, large collapsed areas and deteriorated parts of the surface are covered with cloth and fixed using quick-setting cement or the like. If the degree of surface deterioration is relatively low, this step can be omitted.

[0025] Next, a boring machine (not shown) is used to drill vertically from the top surface 20 of the sediment control dam 10 to the vicinity of the installation surface 22, and a filling pipe 26 is inserted into the formed borehole 24 (S12). As shown in Figure 3(b), multiple boreholes 24 are formed at predetermined intervals along the longitudinal direction of the top surface 20 of the sediment control dam 10.

[0026] Subsequently, a slag-based filler material (details described later) is discharged from the side opening formed in the filling pipe 26 at a predetermined pressure using a grout pump (not shown), while the filling pipe 26 is rotated and pulled up vertically at a predetermined speed, so that the internal cavity 12 is filled with the slag-based filler material 28, as shown in Figure 4 (S14).

[0027] Next, after a predetermined curing time (for example, 6 hours) has elapsed, a check boring is performed to confirm the degree of completion of the repair work (S16). At this stage, a predetermined permeability coefficient (e.g., 1.0 × 10) is determined. -6 The repair work will be considered complete when it is confirmed that the speed is below m / sec (S18 / Y).

[0028] In contrast, if the permeability coefficient does not fall below a predetermined level (S18 / N), it suggests that cracks 14 remain inside that the slag-based filler 28 cannot reach, and therefore additional waterproofing treatment is performed. Specifically, as shown in Figure 5, a borehole is drilled again vertically from the top surface 20 of the sediment control dam 10, and an injection pipe 30 is inserted into the resulting borehole 24 (S20). Then, a step is added in which a slag-based loosening injection material (details described later) is discharged from the side opening of the injection pipe 30 at a predetermined pressure, while the injection pipe 30 is rotated and pulled up vertically at a predetermined speed (S22). As a result, as shown in Figure 6, the slag-based slow-setting injection material 32 penetrates into each crack 14 of the sediment control dam 10, and the repair work is completed after a predetermined hardening time (for example, 6 hours) has elapsed.

[0029] Figure 7(a) is a table showing the basic composition of the slag-based filler described above, and is characterized by the use of finely powdered blast furnace slag as a binder instead of cement. Blast furnace slag has the advantage of producing less carbon dioxide emissions during manufacturing compared to cement.

[0030] Furthermore, because it contains sulfate (barium sulfate), which has a relatively high specific gravity, as a weighting agent, the overall specific gravity reaches "2.30," which is higher than the "1.52" of existing cement-based fillers, as shown in Figure 8. Therefore, it eliminates the need for additional concrete pouring, which is carried out in conventional repair work.

[0031] While the weight portion of water is only "40," the weight portion of particles, which combine blast furnace slag, hydroxides, and sulfates, reaches "175." Due to this high particle concentration, it has a uniaxial compressive strength (18 N / mm²) equivalent to that of concrete. 2 It meets the above requirements and has a unit volume weight (2.3 kg / L), and can reduce the bleeding rate to 5% or less.

[0032] Furthermore, because it contains a polycarboxylic acid-based polymer compound that functions as a dispersant, it exhibits high fluidity and uniformity, enabling mixing and pumping by general plant machinery, and allowing for flexible penetration between existing aggregates.

[0033] Figure 7(b) illustrates the range of mixing ratios for other materials, with the weight of the main material, blast furnace slag, set to 100. For blast furnace slag, the amount added is adjusted, for example, within the range of 720 to 1,500 kg. Even when changing the ratio of each compounding material within this range, it is desirable to adjust the ratio of blast furnace slag to sulfate to keep the overall specific gravity within the range of 2.0 to 2.3 kg / L.

[0034] Figure 9(a) is a mix design table showing the basic composition of the slag-based loose-setting grout described above. Since finely powdered blast furnace slag is used as a binder instead of cement, it can also contribute to reducing carbon dioxide emissions. Furthermore, because it contains a relatively large amount of polycarboxylic acid-based polymer compounds, it exhibits high fluidity and uniformity, allowing it to flexibly penetrate between existing aggregates and into fine cracks. The uniaxial compressive strength of the slag-based loose-setting injection material in this basic mix is ​​1.0 N / mm². 2 It reaches. Figure 9(b) illustrates the range of mixing ratios for other materials when the weight of the main material, blast furnace slag, is set to 100. For blast furnace slag, the amount added is adjusted, for example, within the range of 187 to 250 kg.

[0035] [Second repair method] The second repair method for the sediment control dam 10 will be explained according to the flowchart in Figure 10. First, as shown in Figure 11(a), the upstream wall surface 16 and the downstream wall surface 18 of the sediment control dam 10 are subjected to the same caulking treatment as described above (S30).

[0036] Next, a boring machine is used to drill obliquely from the top surface 20 of the sediment control dam 10 to the inside of the upstream side wall 16 and the downstream side wall 18, and injection pipes 30 are inserted into the formed boreholes 25a and 25b (S32). As shown in Figure 11(b), boreholes 25a and 25b are formed at predetermined intervals along the longitudinal direction of the top surface 20 of the sediment control dam 10.

[0037] Subsequently, a slag-based instant-setting injection material (details described later) is discharged from the side opening formed in the injection pipe 30 at a predetermined pressure, and the injection pipe 30 is rotated and pulled up diagonally at a predetermined speed, thereby forming liquid leakage prevention layers 34a and 34b on the inside of the upstream side wall surface 16 and the downstream side wall surface 18, as shown in Figure 12 (S34).

[0038] Next, as shown in Figure 13(a), a boring machine is used to drill vertically from the top surface 20 of the sediment control dam 10 to the vicinity of the installation surface 22, and a filling pipe 26 is inserted into the formed borehole 24 (S36). As shown in Figure 13(b), multiple boreholes 24 are formed at predetermined intervals along the longitudinal direction of the top surface 20 of the sediment control dam 10.

[0039] Subsequently, while discharging the slag-based filler material at a predetermined pressure from the side opening formed in the filling pipe 26, the filling pipe 26 is rotated and pulled up vertically at a predetermined speed, so that the internal cavity 12 is filled with the slag-based filler material 28, as shown in Figure 14 (S38).

[0040] Next, after a predetermined curing time (for example, 6 hours) has elapsed, a check boring is performed to confirm the degree of completion of the repair work (S40). At this stage, a predetermined permeability coefficient (e.g., 1.0 × 10) is determined. -6 The repair work will be considered complete when it is confirmed that the speed is below m / sec (S42 / Y).

[0041] In contrast, if the permeability coefficient does not fall below a predetermined level (S42 / N), it suggests that many cracks 14 remain inside, and therefore, the same waterproofing treatment as described above is added. In other words, although not shown in the diagram, a borehole is drilled again vertically from the top surface 20 of the sediment control dam 10, and an injection pipe 30 is inserted into the resulting borehole 24 (S44). Then, a step is added in which a slag-based loosening injection material is discharged from the side opening of the injection pipe 30 at a predetermined pressure while the injection pipe 30 is pulled up vertically at a predetermined speed (S46). As a result, as shown in Figure 15, the slag-based slow-setting injection material 32 penetrates into each crack 14 within the sediment control dam 10, and the repair work is completed after a predetermined hardening time (for example, 6 hours) has elapsed.

[0042] Figure 16(a) shows the mix design for the slag-based instant-setting grout described above. Because finely powdered blast furnace slag is used as a binder instead of cement, a reduction in carbon dioxide emissions can be expected. Furthermore, this slag-based instant-setting injection material contains relatively large amounts of hydroxide (slaked lime) and carbonate (potassium carbonate), and its gel time is extremely short, about 10 seconds. Therefore, it is possible to quickly form leak prevention layers 34a and 34b on sediment control dams 10 that have severe surface damage. Figure 16(b) illustrates the range of mixing ratios for other materials, with the weight of the main material, blast furnace slag, set to 100. For blast furnace slag, the amount added is adjusted, for example, within the range of 187 to 300 kg.

[0043] [Third repair method] The third repair method for the sediment control dam 10 will be explained according to the flowchart in Figure 17. This construction method includes the steps of applying caulking to the upstream side wall 16 and downstream side wall 18 of the sediment control dam 10 (S50), drilling obliquely from the top surface 20 of the sediment control dam 10 along the upstream side wall 16 and downstream side wall 18, and inserting injection pipes 30 into the formed boreholes 25a and 25b (S52), and forming liquid leakage prevention layers 34a and 34b by diagonally pulling up the injection pipe while discharging slag-based instant-setting injection material from the side opening of the injection pipe 30 (S54). Up to this point, it is the same as the second repair process shown in Figures 11 and 12.

[0044] A distinctive feature of the third repair method is that, after forming the water leakage prevention layers 34a and 34b, a borehole is drilled vertically from the top surface 20 of the sediment control dam 10 to the vicinity of the installation surface 22, and then an injection pipe 30 is inserted into the formed borehole 24 instead of the filling pipe 26 shown in Figure 13 (S56). Subsequently, while discharging a slag-based loosening injection material at a predetermined pressure from the side opening formed in the injection pipe 30 instead of the slag-based filler, the injection pipe 30 is rotated and pulled up vertically at a predetermined speed. As shown in Figure 18, the slag-based loosening injection material penetrates into the internal cavity 12 and crack 14, filling the gap (S58).

[0045] This third repair method has the advantage of eliminating the need for double work, as it allows for the simultaneous sealing of both the cavity 12 and the crack 14 using the slag-based loosening injection material, instead of filling the cavity 12 with a slag-based filler and then filling the crack 14 with a slag-based loosening injection material, as in the second repair method.

[0046] However, since the slag-based loose-setting injection material does not contain sulfate (barium sulfate) as a weighting agent, it is difficult to secure the necessary weight for the sediment control dam 10, so an additional concrete layer 38 is formed on the downstream side wall 18 (S60). As mentioned above, the slag-based quick-setting injection material and slag-based slow-setting injection material used in this third repair method do not contain cement, and therefore have the effect of reducing carbon dioxide emissions.

[0047] [The fourth repair method] The fourth repair method is characterized only by replacing the "blast furnace slag" in the slag-based filler mixture shown in Figure 7(a) with the same amount of "blast furnace slag cement." The other components are basically the same as those of the first repair method, so they are not shown in the illustration. Here, "blast furnace slag cement" refers to a mixture of blast furnace slag and ordinary Portland cement, and a mixture in a ratio of, for example, "formula:latter = 4:6" is used.

[0048] Even in this case, since the filler contains sulfate (barium sulfate), the advantage of easily securing the necessary weight for the sediment control dam 10 can be enjoyed, and the formation of an additional concrete layer can be omitted. Furthermore, in terms of strength development, using blast furnace slag cement is considered more advantageous than using blast furnace slag. Furthermore, because the filler contains blast furnace slag, the amount of cement used can be reduced. When implementing the second repair method described above, a slag-based filler material can be used in which "blast furnace slag" is replaced with "blast furnace slag cement."

[0049] [Fifth Repair Method] The fifth repair method is characterized by the use of a cement-based filler instead of the slag-based filler used in the first repair method. Since the other components are basically the same as those of the first repair method, the diagram is omitted. This cement-based filler is made by replacing only the "blast furnace slag" in the composition of the slag-based filler shown in Figure 7(a) with the same amount of "ordinary cement," while the other constituent materials are the same as those of the slag-based filler.

[0050] In other words, because it also contains sulfate (barium sulfate) which functions as a weighting agent, it has the advantage of easily securing the necessary weight for the sediment control dam 10. Therefore, additional concrete is not required, and carbon dioxide emissions can be reduced accordingly. Furthermore, in terms of strength development, it can be said to be more advantageous compared to using blast furnace slag or blast furnace slag cement. When implementing the second or fourth repair methods described above, cement-based fillers can also be used in which "blast furnace slag" or "blast furnace slag cement" is replaced with "ordinary cement."

[0051] [The sixth repair method] Figure 19 shows the sixth repair method, in which an additional concrete layer 38 is formed on the downstream side wall 18 of the sediment control dam 10 to which the first repair method has been applied. In the first repair method, as mentioned above, a filler containing sulfate (barium sulfate), which is easy to secure in terms of weight, is used. However, depending on the site conditions after the repair, there is a possibility that the unit volume weight may be insufficient.

[0052] Therefore, if a check boring after the first repair method reveals that the required unit volume weight (e.g., 2.30 kg / L) is not met, the required weight can be secured by adding an additional concrete layer 38 as shown in the figure. Although an additional concrete layer 38 is formed, the majority of the required weight is secured by a filler containing sulfate (barium sulfate), which allows for a reduction in the amount of concrete used. When implementing the second, fourth, or fifth repair methods described above, the missing weight can be compensated for by forming the minimum necessary additional concrete layer 38 according to the site conditions.

[0053] Figure 20 shows the specific surface area of ​​blast furnace slag in slag-based fillers, slag-based slow-setting injection materials, and slag-based instant-setting injection materials. The larger the specific surface area, the finer the particles become, making it easier for them to penetrate narrow gaps.

[0054] Figure 21 is a graph showing the relationship between the curing period of slag-based filler and its unconfined compressive strength (the thickness of the graph represents the range of the mix design), and it can be seen that the unconfined compressive strength tends to increase as the curing period increases.

[0055] Figure 22 is a graph showing the relationship between the number of days elapsed and the bleeding rate of the slag-based packing material. It can be seen that in both cases, when the amount of blast furnace slag added was 1,059 kg and 1,288 kg, the bleeding rate on the third day was kept low at 5% or less.

[0056] Figure 23 is a graph showing the change in viscosity of the slag-based packing material over time. It shows that a relatively low viscosity is maintained within the gel time of 6 hours, regardless of whether the amount of blast furnace slag added is 1,059 kg or 1,288 kg.

[0057] Figure 24 is a graph showing the change in flow value of the slag-based packing material over time. It shows that a relatively high flow value is maintained within the gel time of 6 hours, regardless of whether the amount of blast furnace slag added is 1,059 kg or 1,288 kg.

[0058] Figure 25 is a graph showing the change in gel time depending on the amount of carbonate (potassium carbonate) added to a slag-based instantaneous grouting material (the thickness of the graph represents the range of the formulation), and it shows that the gel time is shortened as the amount of carbonate added increases. [Explanation of Symbols]

[0059] 10. Sediment control dam 12 Cavity 14 Cracks 16 Upstream wall 18 Downstream side wall 20 Top surface 24 boreholes 25a Borehole 25b Borehole 26 Filling tube 28. Slag-based fillers 30 Injection tube 32 Slag-based loose-setting injection material 34a Liquid spill prevention layer 34b Liquid spill prevention layer 38. Additional concrete layer

Claims

1. The process involves drilling a hole to a predetermined distance from the surface of the sediment control dam, The process includes at least the step of filling the cavities within the sediment control dam with a filling material by discharging a filling material into the formed borehole, A method for repairing sediment control dams, characterized in that the above-mentioned filling material consists of blast furnace slag, blast furnace slag cement, or a substance mainly composed of cement, to which a weighting agent consisting of at least water and sulfate is added.

2. The process involves drilling again to a predetermined distance from the surface of the sediment control dam after filling the gap with a filler material, A construction method that adds a step of filling cracks in a sediment control dam with a slag-based loosening injection material by discharging a slag-based loosening injection material into the formed borehole, The repair method for a sediment control dam according to claim 1, characterized in that the slag-based loosening injection material is composed of a substance mainly made of blast furnace slag to which a dispersant consisting of at least water and a polymer compound is added.

3. The process involves first drilling a hole diagonally from the surface of the sediment control dam along the upstream and / or downstream side walls to a predetermined distance, A construction method that involves performing the step of forming a liquid leakage prevention layer on the inside of the upstream side wall and / or the inside of the downstream side wall by discharging a slag-based instant-setting injection material into the formed borehole, The repair method for a sediment control dam according to claim 1 or 2, characterized in that the above-mentioned slag-based instant-setting injection material is composed of a substance mainly made of blast furnace slag to which at least water, hydroxides, and carbonates are added.

4. A method for repairing a sediment control dam according to claim 1 or 2, characterized by forming an additional concrete layer on the downstream side wall of the sediment control dam.

5. The process involves drilling a hole diagonally from the surface of the sediment control dam along the upstream side wall and / or the downstream side wall to a predetermined distance, The process involves discharging a slag-based instant-setting injection material into the formed borehole to create a liquid leakage prevention layer on the inside of the upstream side wall and / or the inside of the downstream side wall, The process involves drilling a hole to a predetermined distance from the surface of the sediment control dam, The process involves discharging a slag-based loosening injection material into the formed boreholes to fill cavities and cracks within the sediment control dam with the slag-based loosening injection material, The process includes forming an additional concrete layer on the downstream side wall of the sediment control dam. The above-mentioned slag-based instantaneous injection material is composed of a substance mainly made of blast furnace slag, to which at least water, hydroxides, and carbonates are added. A method for repairing sediment control dams, characterized in that the above-mentioned slag-based loosening injection material is composed of a substance mainly made of blast furnace slag, to which a dispersant consisting of at least water and a polymer compound is added.

6. A filler made of blast furnace slag, blast furnace slag cement, or cement as the main material, to which a weighting agent consisting of at least water and sulfate is added.

7. A slag-based loose-setting injection material comprising blast furnace slag as the main material, to which a dispersant consisting of at least water and a polymer compound is added.

8. A slag-based instantaneous setting injection material consisting mainly of blast furnace slag, to which at least water, hydroxides, and carbonates are added.

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