Fluidized soil

Abstract

To provide fluidized soil that does not use cement as a solidification material, and a method for determining blending of the fluidized soil.SOLUTION: When a unit water amount per unit volume of water is W, the amount of powder per unit volume of blast furnace slag fine powder and fly ash is P, the unit volume of fine aggregate per unit volume of fine aggregate is SL, the mortar unit volume per unit volume of the mortar made of water, blast furnace slag fine powder, fly ash, and fine aggregate is ML, and a replacement ratio of the blast furnace slag fine powder to the powder amount P is BF, the fly ash is a fly ash II class that conforms to JIS A6201, and the fine aggregate has a coarse grain ratio of 2.5 or less and the substitution rate BF is 5% or more but less than 20%, the unit water amount W is 385 kg / m3 or more and 500 kg / m3 or less, the powder water ratio (P / W) is 1.63 or more and 2.75 or less, and the fine aggregate volume ratio (SL / ML) is 35% or less.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a liquefied treated soil that does not contain cement as a solidification material and a method for determining the mix proportions of the liquefied treated soil. [Background technology]

[0002] Patent Documents 1 and 2 propose fluidized treated soil containing fly ash and blast furnace slag. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-224503 A [Patent Document 2] JP 2001-295264 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, both Patent Document 1 and Patent Document 2 use cement as the solidification material.

[0005] The present invention aims to provide a liquefied treated soil that does not use cement as a solidification material, and a method for determining the composition of the liquefied treated soil. [Means for solving the problem]

[0006] The fluidized soil of the present invention described in claim 1 contains ground granulated blast furnace slag, fly ash, water, and fine aggregate, and does not contain cement as a solidification material. Without using an alkaline activatorIn a fluidized treated soil having no water content per unit volume of the water, W is the amount of powder per unit volume of the ground granulated blast furnace slag and the fly ash, P is the unit volume of the fine aggregate per unit volume of the fine aggregate, ML is the unit volume of mortar per unit volume of the mortar consisting of the water, the ground granulated blast furnace slag, the fly ash, and the fine aggregate, and BF is the substitution rate of the ground granulated blast furnace slag for the amount of powder P, if the fly ash is fly ash type II conforming to JIS A6201, the fine aggregate has a coarse grain ratio of 2.5 or less, and the substitution rate BF is 5% or more and less than 20%, the unit water content W is 385 kg / m 3 Over 500kg / m 3 The powder-water ratio (P / W) is 1.63 or more and 2.75 or less, and the fine aggregate volume ratio (SL / ML) is 35% or less. The fluidized soil of the present invention described in claim 2 contains ground granulated blast furnace slag, fly ash, water, and fine aggregate, and does not contain cement as a solidification material. Without using an alkaline activator In a fluidized treated soil having no water content per unit volume of the water, W is the amount of powder per unit volume of the ground granulated blast furnace slag and the fly ash, P is the unit volume of the fine aggregate per unit volume of the fine aggregate, ML is the unit volume of mortar per unit volume of mortar consisting of the water, the ground granulated blast furnace slag, the fly ash, and the fine aggregate, and BF is the substitution rate of the ground granulated blast furnace slag for the amount of powder P, if the fly ash is fly ash type II conforming to JIS A6201, the fine aggregate has a coarse grain ratio of 2.5 or less, and the substitution rate BF is 20% or more and 40% or less, the unit water content W can be set to 400 kg / m 3 Over 500kg / m 3 The powder-water ratio (P / W) is 1.63 or more and 1.76 or less, and the fine aggregate volume ratio (SL / ML) is 33% or less. The fluidized soil of the present invention described in claim 3 contains ground granulated blast furnace slag, fly ash, water, and fine aggregate, and does not contain cement as a solidification material. Without using an alkaline activatorIn a fluidized treated soil having no water content per unit volume of the water, W is the amount of powder per unit volume of the ground granulated blast furnace slag and the fly ash, P is the unit volume of the fine aggregate per unit volume of the fine aggregate, ML is the unit volume of mortar per unit volume of the mortar consisting of the water, the ground granulated blast furnace slag, the fly ash, and the fine aggregate, and BF is the substitution rate of the ground granulated blast furnace slag for the amount of powder P, if the fly ash is fly ash type II conforming to JIS A6201, the fine aggregate has a coarse grain ratio exceeding 2.5, and the substitution rate BF is 5% or more and less than 20%, the unit water content W is 320 kg / m 3 Over 500kg / m 3 The powder-water ratio (P / W) is 1.32 or more and 2.65 or less, and the fine aggregate volume ratio (SL / ML) is 50% or less. The fluidized soil of the present invention described in claim 4 contains ground granulated blast furnace slag, fly ash, water, and fine aggregate, and does not contain cement as a solidification material. Without using an alkaline activator In a fluidized treated soil having no water content per unit volume of the water, W is the amount of powder per unit volume of the ground granulated blast furnace slag and the fly ash, P is the unit volume of the fine aggregate per unit volume of the fine aggregate, ML is the unit volume of mortar per unit volume of the mortar consisting of the water, the ground granulated blast furnace slag, the fly ash, and the fine aggregate, and BF is the substitution rate of the ground granulated blast furnace slag for the amount of powder P, if the fly ash is fly ash type II conforming to JIS A6201, the fine aggregate has a coarse grain ratio exceeding 2.5, and the substitution rate BF is 20% or more and 40% or less, the unit water content W is 335 kg / m 3 Over 500kg / m 3 The powder-water ratio (P / W) is 1.32 or more and 1.66 or less, and the fine aggregate volume ratio (SL / ML) is 48% or less. The fluidized soil of the present invention described in claim 5 contains ground granulated blast furnace slag, fly ash, water, and fine aggregate, and does not contain cement as a solidification material. Without using an alkaline activatorIn a fluidized treated soil having no water content per unit volume of the water, W is the amount of powder per unit volume of the ground granulated blast furnace slag and the fly ash, P is the unit volume of the fine aggregate per unit volume of the fine aggregate, ML is the unit volume of the mortar per unit volume of the mortar consisting of the water, the ground granulated blast furnace slag, the fly ash, and the fine aggregate, and BF is the substitution rate of the ground granulated blast furnace slag for the amount of powder P, if the fly ash is fly ash raw powder not conforming to JIS A6201 and having an ignition loss of 5% or more, the fine aggregate has a coarse particle ratio of 2.5 or less, and the substitution rate BF is 5% or more and less than 20%, then the unit water content W is 375 kg / m 3 Over 500kg / m 3 The powder-water ratio (P / W) is 1.44 or more and 2.65 or less, and the fine aggregate volume ratio (SL / ML) is 40% or less. The fluidized soil of the present invention described in claim 6 contains ground granulated blast furnace slag, fly ash, water, and fine aggregate, and does not contain cement as a solidification material. Without using an alkaline activator In a fluidized treated soil having no water content per unit volume of the water, W is the amount of powder per unit volume of the ground granulated blast furnace slag and the fly ash, P is the unit volume of the fine aggregate per unit volume of the fine aggregate, ML is the unit volume of mortar per unit volume of the mortar consisting of the water, the ground granulated blast furnace slag, the fly ash, and the fine aggregate, and BF is the substitution rate of the ground granulated blast furnace slag for the amount of powder P, if the fly ash is fly ash raw powder not conforming to JIS A6201 and having an ignition loss of 5% or more, the fine aggregate has a coarse particle ratio of 2.5 or less, and the substitution rate BF is 20% or more and 30% or less, the unit water content W is 390 kg / m 3 Over 500kg / m 3 The powder-water ratio (P / W) is 1.44 or more and 1.47 or less, and the fine aggregate volume ratio (SL / ML) is 38% or less. Effect of the Invention

[0007] According to the present invention, it is possible to obtain liquefied treated soil having excellent fluidity, resistance to material separation, and strength characteristics without using cement as a solidification material. [Brief description of the drawings]

[0008] [Figure 1] Graph showing the relationship between powder amount P and flow value [Diagram 2] A graph showing the relationship between the powder amount P and unit water amount W at different replacement rates BF to obtain the target flow value. [Diagram 3] Graph showing the relationship between powder water ratio and bleeding at different replacement rates BF [Figure 4] Graph showing the relationship between powder water ratio and bleeding at different replacement rates BF [Diagram 5] Graph showing the relationship between unit water volume W and bleeding at different replacement rates BF [Figure 6] Graph showing the relationship between unit water volume W and bleeding at different replacement rates BF [Figure 7] Graph showing the relationship between powder amount P and bleeding at different substitution rates BF [Figure 8] Graph showing the relationship between powder amount P and bleeding at different substitution rates BF [Figure 9] Graph showing the relationship between fine aggregate volume ratio and bleeding at different replacement rates BF [Figure 10] Graph showing the relationship between fine aggregate volume ratio and bleeding at different replacement rates BF [Figure 11] Graph showing the relationship between powder water ratio and unconfined compressive strength (28 days) for different replacement rates BF [Figure 12] Graph showing the relationship between unconfined compressive strength at ages of 7 days and 28 days for different replacement rates BF [Figure 13] Graph showing the relationship between unconfined compressive strength at ages of 7 days and 28 days for different replacement rates BF [Figure 14] Graph showing the relationship between powder amount P and flow value [Figure 15]A graph showing the relationship between powder amount P and unit water content W for different types of fine aggregate to obtain the target flow value [Figure 16] Graph showing the relationship between powder water ratio and bleeding for different types of fine aggregate [Figure 17] Graph showing the relationship between powder water ratio and bleeding for different types of fine aggregate [Figure 18] Graph showing the relationship between unit water content W and bleeding for different types of fine aggregate [Figure 19] Graph showing the relationship between powder amount P and bleeding for different types of fine aggregate [Figure 20] Graph showing the relationship between fine aggregate volume ratio and bleeding for different types of fine aggregate [Figure 21] A graph showing the relationship between powder water ratio and unconfined compressive strength (28 days) for different types of fine aggregate [Figure 22] A graph showing the relationship between unconfined compressive strength at ages of 7 days and 28 days for different types of fine aggregate [Figure 23] Graph showing the relationship between powder amount P and flow value [Figure 24] A graph showing the relationship between the powder amount P and unit water amount W for different types of fly ash to achieve a target flow value of 250 mm [Diagram 25] A graph showing the relationship between water-to-powder ratio and bleeding for different types of fly ash [Figure 26] A graph showing the relationship between water-to-powder ratio and bleeding for different types of fly ash [Figure 27] A graph showing the relationship between unit water volume W and bleeding for different types of fly ash [Figure 28] Graph showing the relationship between powder amount P and bleeding for different types of fly ash [Figure 29] Graph showing the relationship between fine aggregate volume ratio and bleeding for different types of fly ash [Diagram 30] A graph showing the relationship between powder water ratio and unconfined compressive strength (28 days) for different types of fly ash [Diagram 31] A graph showing the relationship between unconfined compressive strength at 7 days and 28 days for different fly ash types DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] In the liquefied treated soil according to the first embodiment of the present invention, the fly ash is type II fly ash conforming to JIS A6201, the fine aggregate has a coarse aggregate ratio of 2.5 or less, and the replacement rate BF is 5% or more and less than 20%, the unit water content W is 385 kg / m 3 Over 500kg / m 3 The powder-water ratio (P / W) is 1.63 or more and 2.75 or less, and the fine aggregate volume ratio (SL / ML) is 35% or less. According to this embodiment, when fly ash type II and fine aggregate with a coarse aggregate ratio of 2.5 or less are used and the replacement rate BF is 5% or more and less than 20%, it is possible to obtain fluidized treated soil with excellent fluidity, resistance to material separation, and strength properties.

[0010] In the liquefied treated soil according to the second embodiment of the present invention, the fly ash is type II fly ash conforming to JIS A6201, the fine aggregate has a coarse aggregate ratio of 2.5 or less, and the replacement rate BF is 20% or more and 40% or less, the unit water content W is 400 kg / m 3 Over 500kg / m 3 The powder-water ratio (P / W) is 1.63 or more and 1.76 or less, and the fine aggregate volume ratio (SL / ML) is 33% or less. According to this embodiment, when fly ash type II and fine aggregate with a coarse aggregate ratio of 2.5 or less are used and the replacement rate BF is 20% or more and 40% or less, it is possible to obtain liquefied treated soil with excellent fluidity, resistance to material separation, and strength properties.

[0011] In the liquefied treated soil according to the third embodiment of the present invention, the fly ash is type II fly ash conforming to JIS A6201, the fine aggregate has a coarse aggregate ratio exceeding 2.5, and the replacement rate BF is 5% or more and less than 20%, the unit water content W is 320 kg / m 3 Over 500kg / m 3The powder-water ratio (P / W) is set to 1.32 or more and 2.65 or less, and the fine aggregate volume ratio (SL / ML) is set to 50% or less. According to this embodiment, when fly ash type II and fine aggregate with a coarse aggregate ratio exceeding 2.5 are used and the replacement rate BF is 5% or more and less than 20%, it is possible to obtain fluidized treated soil with excellent fluidity, resistance to material separation, and strength properties.

[0012] In the liquefied treated soil according to the fourth embodiment of the present invention, the fly ash is type II fly ash conforming to JIS A6201, the fine aggregate has a coarse aggregate ratio exceeding 2.5, and the replacement rate BF is 20% or more and 40% or less, the unit water content W is 335 kg / m 3 Over 500kg / m 3 The powder-water ratio (P / W) is 1.32 or more and 1.66 or less, and the fine aggregate volume ratio (SL / ML) is 48% or less. According to this embodiment, when fly ash type II and fine aggregate with a coarse aggregate ratio exceeding 2.5 are used and the replacement rate BF is 20% or more and 40% or less, it is possible to obtain liquefied treated soil with excellent fluidity, resistance to material separation, and strength properties.

[0013] In the fifth embodiment of the present invention, the liquefied treated soil is fly ash powder not conforming to JIS A6201 and having an ignition loss of 5% or more, the fine aggregate has a coarse aggregate ratio of 2.5 or less, and the replacement rate BF is 5% or more and less than 20%, and the unit water content W is 375 kg / m 3 Over 500kg / m 3 The powder-water ratio (P / W) is 1.44 or more and 2.65 or less, and the fine aggregate volume ratio (SL / ML) is 40% or less. According to this embodiment, when fly ash raw powder and fine aggregate with a coarse aggregate ratio of 2.5 or less are used and the replacement rate BF is 5% or more and less than 20%, it is possible to obtain fluidized treated soil with excellent fluidity, material separation resistance, and strength characteristics.

[0014] In the sixth embodiment of the present invention, the liquefied treated soil is fly ash raw powder not conforming to JIS A6201 and having an ignition loss of 5% or more, the fine aggregate has a coarse aggregate ratio of 2.5 or less, and the replacement rate BF is 20% or more and 30% or less, and the unit water content W is 390 kg / m 3 Over 500kg / m 3 The powder-water ratio (P / W) is set to 1.44 or more and 1.47 or less, and the fine aggregate volume ratio (SL / ML) is set to 38% or less. According to this embodiment, when fly ash raw powder and fine aggregate with a coarse aggregate ratio of 2.5 or less are used and the replacement rate BF is set to 20% or more and 30% or less, it is possible to obtain fluidized treated soil with excellent fluidity, material separation resistance, and strength characteristics. EXAMPLES

[0015] An embodiment of the present invention will now be described with reference to the drawings. The fluidized treated soil according to this embodiment contains ground granulated blast furnace slag, fly ash, water, and fine aggregate, but does not contain cement as a solidification material. For the ground granulated blast furnace slag, "ground granulated blast furnace slag 4000" conforming to JIS A 6206 was used. Ground granulated blast furnace slag is prepared by spraying a large amount of water or air at high speed onto molten slag discharged from a blast furnace in a steelworks to produce rapidly cooled granular material, which is then finely pulverized. The fly ash used was "Type II fly ash" that complies with JIS A 6201 and "raw fly ash powder" with an ignition loss of 5% or more that does not comply with JIS A 6201. Fly ash is a by-product of burning pulverized coal in coal-fired power plants, in which molten ash cools and turns into globular particles that are then collected by an electric dust collector or the like. The fine aggregates used were those conforming to JIS A 5308 Appendix A, with a coarse aggregate ratio of 2.5 or less (2.20±0.30) and those with a coarse aggregate ratio of more than 2.5 (2.70±0.15). The fluidized soil was prepared by adding fine aggregate, powder (ground granulated blast furnace slag, fly ash), and water to the mixer in that order, and mixing was continued for 30 to 90 seconds after all materials had been added. In the following explanation, the unit water amount per unit volume of water is W, the powder amount per unit volume of ground granulated blast furnace slag and fly ash is P, the unit volume of fine aggregate per unit volume of fine aggregate is SL, the unit volume of mortar per unit volume of mortar consisting of water, ground granulated blast furnace slag, fly ash, and fine aggregate is ML, and the replacement rate of ground granulated blast furnace slag for the powder amount P is BF.

[0016] <Consideration 1> The replacement ratio BF of ground granulated blast furnace slag to the powder amount P and its effect on the fluidity (flow value), material separation characteristics (bleeding rate), and hardening properties (uniaxial compressive strength) of fluidized treated soil in the range of excessive and insufficient powder amount P were investigated. Fluidity (flow value) was measured according to JHS A 313 "Test methods for air mortar and air milk". Material separation characteristics (bleeding rate) were measured according to JSCE-F 522 "Test method for bleeding rate and expansion rate of injection mortar for prepacked concrete". Strength characteristics (uniaxial compressive strength) were measured according to JIS A 1216 "Uniaxial compression test method for soil". <Target quality> Flow value is 250±20mm (230~270mm), bleeding rate is less than 3%, uniaxial compressive strength is 100~1000kN / m 2 It was decided.

[0017] <Composition conditions> The ground granulated blast furnace slag was replaced with 6 levels of powder amount P at mass ratios of 5, 10, 15, 20, 30, and 40%, and the powder amount P was set to 300 to 1000 kg / m for each replacement rate BF. 3 The range was set to 3 to 6 levels. The unit water amount was adjusted so that the flow value for each powder amount P was within the range of 250±20 mm.

[0018] <Considerations by factor> <Liquidity (flow value)> FIG. 1 is a graph showing the relationship between the powder amount P and the flow value. As shown in Figure 1, the powder amount P is 300 kg / m 3 ~1000kg / m 3 In this case, the unit water content W is 300 kg / m 3 ~500kg / m 3 By increasing or decreasing the flow rate within this range, the target fluidity (flow value 250±20mm) can be obtained.

[0019] <Unit water volume> FIG. 2 is a graph showing the relationship between the powder amount P and the unit water amount W for different replacement rates BF to obtain a target flow value. When the target flow value was constant, the unit water volume W increased with an increase in the powder amount P regardless of the difference in the replacement rate BF, showing a positive correlation. Powder amount P is 500kg / m 3 In the following undersized region, the proportion of fine aggregate becomes relatively excessive, resulting in a large density difference between the paste and fine aggregate, and it was confirmed that the unit water volume W required to obtain the target flow value tends to be slightly larger. The relationship between the powder amount P and the unit water amount W was not significantly different depending on the substitution rate BF. 3 In the following undersized region, the unit water content W decreased slightly with increasing replacement rate BF. The rate of increase in unit water volume W relative to the increase in powder volume P is 500 kg / m 3 In the following undersized regions, the powder amount is P50kg / m 3 The unit water volume W for increase or decrease is 0 to 5 kg / m 3 Increase or decrease, powder amount P is 500kg / m 3 In the excessive region exceeding P50kg / m 3 The unit water volume W for the increase or decrease is 10 to 15 kg / m 3 It became. From the above, once the powder amount P is determined, the unit water amount W for obtaining the target flow value can be determined, and once the unit water amount W is determined, the powder amount P can be determined.

[0020] <Breeding rate> 3 and 4 are graphs showing the relationship between the powder water ratio and bleeding at different substitution rates BF. Regardless of the difference in the replacement rate BF, the bleeding rate decreased with an increase in the powder-water ratio, showing a negative correlation. No significant difference was found in the relationship between the powder-water ratio and the bleeding rate due to differences in the replacement rate BF. Therefore, the linear approximation formula in Figure 4 can be used regardless of differences in the replacement rate BF. A small powder-to-water ratio means that the unit water volume W is relatively large compared to the powder volume P, so it is thought that as the powder-to-water ratio decreased, the mixed water became surplus water, causing an increase in bleeding. The approximate formula obtained is as follows: y=-4.1578x+9.7891 According to the results of this approximation formula, the powder-water ratio to obtain a bleeding rate of less than 3% is 1.63 or more.

[0021] 5 and 6 are graphs showing the relationship between the unit water content W and bleeding at different replacement rates BF. Regardless of the difference in replacement rate BF, the bleeding rate decreased with an increase in unit water content W, showing a negative correlation. No significant difference was found in the relationship between the unit water volume W and the bleeding rate due to differences in the replacement rate BF, but when the replacement rate BF was 20% or higher, the bleeding rate showed a slight tendency to increase. Therefore, a substitution rate BF of 20% was used as a threshold value to obtain a linear approximation equation for FIG. The approximate formula obtained is as follows: (BF 20% or more) y = -0.0525x + 23.975 (BF less than 20%) y = -0.020x + 10.751 From the results of this approximation formula, the unit water volume W to obtain a bleeding rate of less than 3% is 400 kg / m for BF of 20% or more. 3 Above 385kg / m for BF20% or less 3 That's all.

[0022] 7 and 8 are graphs showing the relationship between the powder amount P and bleeding for different replacement rates BF. Regardless of the difference in the replacement rate BF, the bleeding rate decreased with an increase in the powder amount P, showing a negative correlation. No significant difference was found in the relationship between the powder amount P and the bleeding rate due to differences in the replacement rate BF, but when the replacement rate BF was 20% or higher, bleeding showed a slight tendency to increase. Therefore, a substitution rate BF of 20% was set as the threshold value to obtain the linear approximation equation in FIG. The approximate formula obtained is as follows: (BF 20% or more) y = -0.0098x + 9.3 (BF less than 20%) y = -0.0053x + 6.3417 From the results of this approximation formula, the powder amount P to obtain a bleeding rate of less than 3% is 640 kg / m for BF 20% or more. 3 Above 630kg / m for BF20% or less 3 That's all.

[0023] 9 and 10 are graphs showing the relationship between the fine aggregate volume ratio and bleeding at different replacement rates BF. Regardless of the difference in replacement rate BF, the bleeding rate increased with an increase in the volume ratio of fine aggregate in mortar, showing a positive correlation. No significant difference was found in the relationship between the volume ratio of fine aggregate in mortar and the bleeding rate due to differences in the replacement rate BF, but when the replacement rate BF was 20% or more, the bleeding rate showed a slight tendency to increase. Therefore, a substitution rate BF of 20% was used as a threshold value to obtain a linear approximation equation for FIG. The approximate formula obtained is as follows: (BF 20% or more) y = 0.1529x - 1.9809 (BF less than 20%) y = 0.0769x + 0.3559 From the results of this approximation formula, the guideline for the fine aggregate volume ratio to achieve a bleeding rate of less than 3% is 33% or less for BF 20% or more, and 35% or less for BF less than 20%. In addition, a large fine aggregate volume ratio in mortar means that the proportion of fine aggregate in the mortar is relatively large. Therefore, it is considered that the fine aggregate settles in the water due to the difference in density, causing the fine aggregate to separate from the water, and that bleeding increases as the fine aggregate volume ratio in mortar increases.

[0024] <Uniaxial compressive strength> FIG. 11 is a graph showing the relationship between the powder-water ratio and the unconfined compressive strength (at 28 days) for different replacement rates BF. Regardless of the difference in the replacement rate BF, there was a positive correlation between the two indices, and the unconfined compressive strength increased with an increase in the powder-water ratio. The larger the replacement rate BF with latent hydraulic properties, the steeper the slope became. The approximate formula obtained is as follows: (BF40)y=2.2687e4.4539x (BF30)y=2.3647e3.8294x (BF20)y=2.5352e3.382x (BF15)y=3.0326e2.9431x (BF10)y=3.8116e2.5455x (BF5)y=6.9953e1.8024x By using this approximate formula, the required unconfined compressive strength is 100 to 1000 kN / m 2 The powder-water ratio required to obtain this can be determined, and the inverse of this, the water-powder ratio, can be calculated for each substitution rate BF. The range of powder water ratio for each replacement rate BF is as follows: (BF40)0.86~1.36 (BF30)0.98~1.57 (BF20)1.09~1.76 (BF15)1.19~1.97 (BF10)1.29~2.18 (BF5)1.48~2.75

[0025] 12 and 13 are graphs showing the relationship between the unconfined compressive strength at ages of 7 days and 28 days for different replacement rates BF. Regardless of the difference in replacement rate BF, the greater the unconfined compressive strength at 7 days, the greater the unconfined compressive strength at 28 days, showing a positive correlation. No significant difference was found between the linear approximation equations for ages 7 and 28 days due to differences in replacement rate BF. Therefore, the linear approximation equation in Figure 13 can be used regardless of differences in replacement rate BF. From the above, when there is a limit to the number of days spent on curing, the unconfined compressive strength at 28 days can be estimated from the unconfined compressive strength at 7 days, which can serve as an indicator for determining the mix ratio to achieve the design strength in a short period of time. The approximate formula obtained is as follows: y=2.5212x-8.6465 From the results of this approximation, the unconfined compressive strength at 28 days is 100 to 1000 kN / m 2 The estimated strength at 7 days to obtain the above value is 43 to 400 kN / m 2 It becomes.

[0026] From the above results, the target fluidity is 300 to 1000 kg / m 3 In the range of 300 to 500 kg / m 3 The required unit water volume W can be estimated from the relationship between the powder volume P and the unit water volume W when the powder volume P increases or decreases. The target material segregation resistance can be estimated from the powder-water ratio, which is calculated from the ratio of the unit water volume W and powder volume P, as they interact with each other, and can be determined at a powder-water ratio of 1.63 or more regardless of differences in the replacement rate BF. The standard unit water volume W to satisfy the target material separation resistance is 400 kg / m when the replacement rate BF is 20% or more. 3 More than 20% is 385kg / m 3 The above can be set arbitrarily. The powder amount P required to satisfy the target material separation resistance is 640 kg / m at a replacement rate of BF of 20% or more. 3 More than 20% is 630kg / m 3 The above is set arbitrarily. The guideline for the fine aggregate volume ratio to satisfy the target material separation resistance (bleeding rate of less than 3%) is 33% or less when the replacement rate BF is 20% or more, and 35% or less when the replacement rate is less than 20%, and can be set at will. The unconfined compressive strength is greatly affected by the substitution rate BF and the powder-water ratio, and the powder-water ratio required to obtain the required unconfined compressive strength can be estimated by using an approximate formula for each substitution rate BF. (BF40)0.86~1.36 (BF30)0.98~1.57 (BF20)1.09~1.76 (BF15)1.19~1.97 (BF10)1.29~2.18 (BF5)1.48~2.75 The unconfined compressive strength at 28 days can be estimated from the unconfined compressive strength at 7 days, which can shorten the time required for mix design.

[0027] <Study 2: Aggregate comparison> The effects of different types of fine aggregate on the fluidity (flow value), material separation characteristics (bleeding rate), and hardening properties (unconfined compressive strength) of liquefied treated soil were examined. The fine aggregates used for comparison were two types: relatively fine fine aggregate with a fractional fine aggregate (FM) of 2.5 or less, and ordinary fine aggregate with a fractional fine aggregate (FM) of over 2.5.

[0028] <Target quality> Flow value is 250±20mm (230~270mm), bleeding rate is less than 3%, and uniaxial compressive strength is 100kN / m 2 ~1000kN / m 2 It was decided.

[0029] <Composition conditions> For two types of fine aggregate, blast furnace slag powder was used at a constant replacement rate of 15% for the powder amount P, and the powder amount P was set to 400 to 800 kg / m 3 There are five levels in the range. The unit water volume W was adjusted so that the flow value for each powder volume P was within the range of 250±20 mm.

[0030] <Considerations by factor> <Liquidity (Flow)> FIG. 14 is a graph showing the relationship between the powder amount P and the flow value. As shown in FIG. 14, regardless of the type of fine aggregate, the target fluidity (flow value 250±20 mm) can be obtained by increasing or decreasing the unit water content W.

[0031] <Unit water volume> FIG. 15 is a graph showing the relationship between the powder amount P and the unit water amount W for different types of fine aggregate to obtain a target flow value. When the target flow value was constant, the unit water content W increased with an increase in the powder content P regardless of the type of fine aggregate, showing a positive correlation. For coarse aggregates with a coarse aggregate ratio of over 2.5, the unit water content W to obtain the target flow value is 10 kg / m 3 It was possible to reduce it. When the coarse aggregate ratio of fine aggregate is large, the unit water content W to obtain the required workability can be reduced, and when the coarse aggregate ratio of fine aggregate is small, the opposite is true. In this test, the target flow value was kept constant, which led to a reduction in the unit water content W for the mix using fine aggregate with a large coarse aggregate ratio. Regardless of the type of fine aggregate, there was no difference in the rate of increase in unit water content W relative to an increase in powder content P, and the unit water content W increased or decreased by 5 to 20 kg for a 50 kg increase or decrease in powder content P. From the above, even if the type of fine aggregate is different, it is possible to design a mix that meets the required performance by sliding the unit water content result, and the powder amount P can be determined based on the determined unit water content W.

[0032] <Breeding rate> 16 and 17 are graphs showing the relationship between the powder water ratio and bleeding for different types of fine aggregate. Regardless of the type of fine aggregate, the bleeding rate decreased with an increase in the water-to-powder ratio, showing a negative correlation. Although there was no significant difference in the tendency to reduce bleeding depending on the type of fine aggregate, coarser fine aggregate with a coarse aggregate ratio of over 2.5 was able to reduce the bleeding rate by about 1%. When the target flow value is constant, fine aggregate with a higher coarse aggregate ratio leads to a reduction in the unit water content W, which in turn leads to a reduction in the amount of bleeding that becomes excess water and moves to the surface. The approximate formula obtained from the relationship between the powder water ratio and the bleeding rate when fine aggregate with a coarse aggregate ratio exceeding 2.5 is as follows. y=-2.6441x+6.4943 According to the results of this approximation formula, the powder-water ratio to obtain a bleeding rate of less than 3% is 1.32 or more. When fine aggregate with a coarse aggregate ratio of 2.5 or less is used, the water-to-powder ratio is 1.63 or more, so when fine aggregate with a coarse aggregate ratio of more than 2.5 is used, the water-to-powder ratio can be designed to be approximately 0.3 lower.

[0033] FIG. 18 is a graph showing the relationship between unit water content W and bleeding for different types of fine aggregate. Regardless of the type of fine aggregate, the bleeding rate decreased with an increase in unit water content W, showing a negative correlation. The approximate formula for the unit water content W and bleeding rate obtained when using fine aggregate with a coarse aggregate ratio exceeding 2.5 at a replacement rate of BF 15% is as follows. y=-0.0118x+6.7682 From the results of this approximation, the unit water volume W to obtain a bleeding rate of less than 3% is approximately 320 kg / m 3 This means that the unit water content W is approximately 65 kg / m compared to fine aggregate with a coarse aggregate ratio of 2.5 or less. 3 It can be reduced.

[0034] FIG. 19 is a graph showing the relationship between the powder amount P and bleeding for different types of fine aggregate. Regardless of the type of fine aggregate, the bleeding rate decreased with an increase in the powder content P, showing a negative correlation. The approximate formula for the powder amount P and bleeding rate obtained when using fine aggregate with a coarse aggregate ratio exceeding 2.5 at a replacement rate of BF 15% is as follows. y=-0.0038x+4.5833 From the results of this approximation formula, the powder amount P to obtain a bleeding rate of less than 3% is approximately 420 kg / m 3 This means that the powder amount P is approximately 210 kg / m compared to fine aggregate with a coarse aggregate ratio of 2.5 or less. 3 It can be reduced.

[0035] FIG. 20 is a graph showing the relationship between fine aggregate volume ratio and bleeding for different types of fine aggregate. Regardless of the type of fine aggregate, the bleeding rate increased with an increase in the volume ratio of fine aggregate in mortar, showing a positive correlation. The approximate formula for the fine aggregate volume ratio and bleeding ratio obtained when using fine aggregate with a coarse aggregate ratio exceeding 2.5 at a replacement rate of BF 15% is as follows. y=0.0517x+0.4088 From the results of this approximation formula, the target fine aggregate volume ratio for achieving a bleeding rate of less than 3% is 50% or less, and the fine aggregate volume ratio can be increased by approximately 15% compared to fine aggregate with a coarse aggregate ratio of 2.5 or less. From the above, even if the type of fine aggregate is different, the unit water content W, powder content P, fine aggregate volume ratio, and powder water ratio can be estimated from the relationship between various factors and the bleeding rate, and a mix design can be made to satisfy the required bleeding rate.

[0036] <Uniaxial compressive strength> FIG. 21 is a graph showing the relationship between the powder water ratio and the unconfined compressive strength (at 28 days) for different types of fine aggregate. Regardless of the type of fine aggregate, there was a positive correlation between the two indices, and the unconfined compressive strength increased as the powder-water ratio increased. Coarse fine aggregate with a coarse aggregate ratio of over 2.5 was more effective in developing strength. Fine aggregate with a coarse aggregate ratio of more than 2.5 is considered to have led to good strength development due to a reduction in the unit water content W to obtain the same flow and a reduction in bleeding that leads to strength defects after hardening. The approximate equation obtained from the relationship between the powder water ratio and unconfined compressive strength when fine aggregate with a coarse aggregate ratio of more than 2.5 is as follows. y=88.737e1.2862x From the results of this approximate formula, the unconfined compressive strength is 100~1000kN / m 2 The powder-water ratio range for obtaining this is 0.10 to 1.88. When using fine aggregate with a coarse aggregate ratio of 2.5 or less, the powder water ratio ranges from 1.19 to 1.97, so the upper limit is 1000 kN / m 2 In order to satisfy this requirement, the powder-water ratio can be designed to be approximately 0.1 smaller.

[0037] FIG. 22 is a graph showing the relationship between the unconfined compressive strength at ages of 7 days and 28 days for different types of fine aggregate. Regardless of the type of fine aggregate, the greater the unconfined compressive strength at 7 days, the greater the unconfined compressive strength at 28 days, showing a positive correlation. No significant difference was found between the linear approximation equations for ages of 7 days and 28 days due to differences in fine aggregate type. Therefore, the strength can be estimated by using the approximation equation obtained in Figure 13 even for fine aggregate with a coarse aggregate ratio exceeding 2.5.

[0038] From the above results, the target fluidity can be estimated from the relationship between the powder amount P and the unit water content W regardless of the type of fine aggregate, and when using fine aggregate with a high coarse aggregate ratio, the unit water content W must be reduced when designing the mix. The target material separation resistance can be estimated from the powder-water ratio, which is calculated from the ratio of the unit water volume W and the powder volume P, as they interact with each other. When using fine aggregate with a high coarse particle ratio, the powder-water ratio can be designed to be small, and can be set to 1.32 or more. The unit water content W required to achieve the target material separation resistance is approximately 65 kg / m when using fine aggregate with a large coarse aggregate ratio. 3 It can be reduced. The powder amount P required to achieve the target material separation resistance is approximately 210 kg / m when using fine aggregate with a high coarse aggregate ratio. 3 It can be reduced. The guideline for the fine aggregate volume ratio to satisfy the target material separation resistance can be increased by approximately 15% when fine aggregate with a high coarse aggregate ratio is used. The unconfined compressive strength can be increased by using fine aggregate with a high coarse aggregate ratio, and the powder-water ratio required to obtain the required strength can be designed to be approximately 0.1 lower. The ability to design a small powder-water ratio leads to the ability to reduce the powder amount P required to obtain the required flow, bleeding rate, and unconfined compressive strength.

[0039] <Study 3: Differences in fly ash> The effects of different fly ash types on the fluidity (flow value), material separation characteristics (bleeding rate), and hardening properties (unconfined compressive strength) of liquefied treated soil were examined. The fly ash used for comparison was two types: fly ash type II conforming to JIS A 6201, and raw fly ash powder that had not been adjusted to produce JIS-conforming fly ash type II.

[0040] <Target quality> Flow value is 250±20mm (230~270mm), bleeding rate is less than 3%, and uniaxial compressive strength is 100kN / m 2 ~1000kN / m 2 It was decided. <Composition conditions> For two types of fly ash, the powdered blast furnace slag was replaced by a constant 15% of the powder amount P, and the powder amount P was set to 400 to 800 kg / m 3 There are five levels in the range. The unit water volume W was adjusted so that the flow value for each powder volume P was within the range of 250±20 mm.

[0041] <Considerations by factor> <Liquidity (Flow)> FIG. 23 is a graph showing the relationship between the powder amount P and the flow value. As shown in Figure 14, regardless of the type of fly ash, the powder amount P is 400 to 800 kg / m 3 Within this range, the target fluidity (flow value 250±20 mm) can be obtained by increasing or decreasing the unit water volume W.

[0042] <Unit water volume> FIG. 24 is a graph showing the relationship between the powder amount P and the unit water amount W for different types of fly ash to obtain a target flow value of 250 mm. When the target flow value was constant, the unit water content W increased with an increase in the powder amount P regardless of the type of fly ash, showing a positive correlation. Fly ash raw powder that does not comply with JIS has a unit water content W of about 10 kg / m to obtain the target flow value, compared to fly ash type II that complies with JIS. 3 It increased. Fly ash raw powder has a larger loss on ignition than type II fly ash, and when the loss on ignition is large, the amount of unburned carbon contained in the fly ash also increases. This is thought to result in the unburned carbon absorbing the moisture required to obtain the required flow, resulting in an increase in the unit water content W. Regardless of the type of fly ash, there was no difference in the rate of increase in unit water volume W relative to an increase in powder amount P, and the unit water volume W increased or decreased by 5 to 20 kg for an increase or decrease in powder amount P of 50 kg. From the above, even if the main fly ash type is different, it is possible to design a mix that satisfies the required performance by sliding the unit water content results shown in Figure 2, and the powder amount P can be determined based on the determined unit water content W.

[0043] <Breeding rate> 25 and 26 are graphs showing the relationship between the powder water ratio and bleeding for different types of fly ash. Regardless of the type of fly ash, the bleeding rate decreased with an increase in the powder-water ratio, showing a negative correlation. Although there was no significant difference in the tendency to reduce bleeding depending on the type of fly ash, the raw fly ash that did not comply with JIS was able to reduce the bleeding rate by about 0.5% compared to the fly ash type II that complies with JIS. When the target flow value was kept constant, the unit water content W of the fly ash raw powder increased, but it is thought that the amount of bleeding also decreased because the unburned carbon adsorbed the excess water that migrated to the surface. The approximate formula obtained from the relationship between the powder water ratio and the bleeding rate when fly ash raw powder is used is as follows. y=-3.0568x+7.409 From the results of this approximation formula, the powder-water ratio to obtain a bleeding rate of less than 3% is 1.44 or more. When using Type II fly ash that complies with JIS, the water-to-powder ratio is 1.63 or more, so when using raw fly ash, the water-to-powder ratio can be designed to be approximately 0.2 lower.

[0044] FIG. 27 is a graph showing the relationship between unit water content W and bleeding for different types of fly ash. Regardless of the type of fly ash, the bleeding rate decreased with an increase in unit water content W, showing a negative correlation. At a replacement rate of BF15%, the approximate formula for the unit water content W and bleeding rate obtained when using fly ash raw powder that does not comply with JIS is as follows. y=-0.0177x+9.6528 From the results of this approximation, the unit water volume W to obtain a bleeding rate of less than 3% is approximately 375 kg / m 3 This means that the unit water content W is approximately 10 kg / m compared to JIS-compliant fly ash type II. 3 It can be reduced.

[0045] FIG. 28 is a graph showing the relationship between the powder amount P and bleeding for different types of fly ash. Regardless of the type of fly ash, the bleeding rate decreased with increasing powder content P, showing a negative correlation. At a replacement rate of BF15%, the approximate formula for the powder amount P and bleeding rate obtained when using fly ash raw powder that does not comply with JIS is as follows. y=-0.0048x+5.6167 From the results of this approximation formula, the powder amount P to obtain a bleeding rate of less than 3% is 545 kg / m 3 This means that the powder amount P is approximately 85 kg / m compared to JIS-compliant fly ash type II. 3 It can be reduced.

[0046] FIG. 29 is a graph showing the relationship between the fine aggregate volume ratio and bleeding for different types of fly ash. Regardless of the type of fly ash, the bleeding rate increased with an increase in the volume ratio of fine aggregate in mortar, showing a positive correlation. The approximate formula for the fine aggregate volume ratio and bleeding ratio obtained when using fly ash raw powder that does not comply with JIS at a replacement rate of BF 15% is as follows. y=0.0692x+0.2827 From the results of this approximation formula, the guideline for the fine aggregate volume ratio to achieve a bleeding rate of less than 3% is 40% or less, which means that the fine aggregate volume ratio can be increased by approximately 5% compared to JIS-compliant fly ash type II. From the above, even if the type of fly ash is different, the unit water content W, powder content P, fine aggregate volume ratio, and powder water ratio can be estimated from the relationship between various factors and the bleeding rate, and a mix design can be made to satisfy the required bleeding rate.

[0047] <Uniaxial compressive strength> FIG. 30 is a graph showing the relationship between the powder water ratio and the unconfined compressive strength (at 28 days) for different types of fly ash. Regardless of the type of fly ash, there was a positive correlation between the two indices, and the unconfined compressive strength increased with an increase in the powder-water ratio. Fly ash raw powder that did not comply with JIS was more effective in developing strength. It is believed that the fly ash raw powder was able to reduce bleeding, which leads to strength defects after hardening, thereby leading to increased strength. The approximate formula obtained from the relationship between the powder water ratio and unconfined compressive strength when using fly ash raw powder is as follows. y=4.8943e2.8469x From the results of this approximate formula, the unconfined compressive strength is 100~1000kN / m 2 The powder-water ratio range for obtaining this is 1.06 to 1.86. When using Type II fly ash that complies with the JIS, the powder-water ratio range is 1.19 to 1.97, so the fly ash raw powder can be designed to have a powder-water ratio that is approximately 0.1 lower.

[0048] FIG. 31 is a graph showing the relationship between the unconfined compressive strength at ages of 7 days and 28 days for different types of fly ash. Regardless of the type of fly ash, the greater the unconfined compressive strength at 7 days, the greater the unconfined compressive strength at 28 days, showing a positive correlation. No significant difference was found between the linear approximation equations for ages 7 and 28 days due to differences in fly ash type. Therefore, the strength of fly ash raw powder can also be estimated using the approximation equation obtained in Figure 13.

[0049] From the above results, the target fluidity can be estimated from the relationship between the powder amount P and the unit water content W regardless of the type of fly ash. When using fly ash with a large ignition loss, it is necessary to increase the unit water content W when designing the mix. The target material separation resistance can be estimated from the powder-water ratio, which is calculated from the ratio of the unit water volume W and powder volume P, as they interact with each other. When using fly ash with a large ignition loss, the powder-water ratio can be designed to be slightly smaller, and can be set to 1.44 or more. The unit water content W required to achieve the target material separation resistance is approximately 10 kg / m when using fly ash powder that does not conform to JIS. 3 It can be reduced. The powder amount P required to satisfy the target material separation resistance is approximately 85 kg / m when using fly ash raw powder that does not conform to JIS. 3 It can be reduced. The guideline for the fine aggregate volume ratio to satisfy the target material separation resistance can be increased by approximately 5% when using fly ash raw powder that does not conform to JIS. The unconfined compressive strength can be increased by using fly ash raw powder that does not conform to the JIS, and the powder-water ratio required to obtain the required strength can be designed to be approximately 0.1 lower. The ability to design a small powder-water ratio leads to the ability to reduce the powder amount P required to obtain the required flow, bleeding rate, and unconfined compressive strength.

[0050] Based on the above considerations, when the unit amount of water per unit volume of water is W, the powder amount per unit volume of ground granulated blast furnace slag and fly ash is P, the unit volume of fine aggregate per unit volume of fine aggregate is SL, the unit volume of mortar per unit volume of mortar consisting of water, ground granulated blast furnace slag, fly ash, and fine aggregate is ML, and the replacement rate of ground granulated blast furnace slag for the powder amount P is BF, the target qualities (fluidity, resistance to material separation, and strength characteristics) of the following fluidized treated soil can be obtained, and the target qualities (fluidity, resistance to material separation, and strength characteristics) can be obtained by the following method of determining the mix proportions of fluidized treated soil.

[0051] In the liquefied soil according to the first embodiment, the fly ash is type II fly ash conforming to JIS A6201, the fine aggregate has a coarse aggregate ratio of 2.5 or less, and the replacement rate BF is 5% or more and less than 20%, the unit water content W is 385 kg / m 3 Over 500kg / m 3 The powder water ratio (P / W) is 1.63 to 2.75, and the fine aggregate volume ratio (SL / ML) is 35% or less. In the fluidized soil according to the first embodiment, the powder amount P is 630 kg / m 3 Over 1000kg / m 3 The following is the result.

[0052] In the second embodiment of the liquefied soil, the fly ash is type II fly ash conforming to JIS A6201, the fine aggregate has a coarse aggregate ratio of 2.5 or less, and the replacement rate BF is 20% or more and 40% or less, and the unit water content W is 400 kg / m 3 Over 500kg / m 3 The powder water ratio (P / W) is 1.63 to 1.76, and the fine aggregate volume ratio (SL / ML) is 33% or less. In the fluidized soil according to the second embodiment, the powder amount P is 640 kg / m 3 Over 1000kg / m 3 The following is the result.

[0053] In the third embodiment of the liquefied soil, the fly ash is type II fly ash conforming to JIS A6201, the fine aggregate has a coarse aggregate ratio of more than 2.5, and the replacement rate BF is 5% or more and less than 20%, the unit water content W is 320 kg / m 3 Over 500kg / m 3 The powder water ratio (P / W) is 1.32 to 2.65, and the fine aggregate volume ratio (SL / ML) is 50% or less. In the fluidized soil according to the third embodiment, the powder amount P is 420 kg / m 3 Over 1000kg / m 3 The following is the result.

[0054] In the liquefied soil according to the fourth embodiment, the fly ash is type II fly ash conforming to JIS A6201, the fine aggregate has a coarse aggregate ratio exceeding 2.5, and the replacement ratio BF is between 20% and 40%, and the unit water content W is set to 335 kg / m 3 Over 500kg / m 3 The powder water ratio (P / W) is 1.32 to 1.66, and the fine aggregate volume ratio (SL / ML) is 48% or less. In the fluidized soil according to the fourth embodiment, the powder amount P is 430 kg / m 3 Over 1000kg / m 3 The following is the result.

[0055] In the fifth embodiment of the liquefied soil, the fly ash is fly ash powder that does not conform to JIS A6201 and has an ignition loss of 5% or more, the fine aggregate has a coarse aggregate ratio of 2.5 or less, and the replacement rate BF is 5% or more and less than 20%, the unit water content W is 375 kg / m 3 Over 500kg / m 3 The powder water ratio (P / W) is 1.44 to 2.65, and the fine aggregate volume ratio (SL / ML) is 40% or less. In the fluidized soil according to the fifth embodiment, the powder amount P is 545 kg / m 3 Over 1000kg / m 3 The following is the result.

[0056] In the sixth embodiment of the liquefied soil, the fly ash is fly ash powder not conforming to JIS A6201 and having an ignition loss of 5% or more, the fine aggregate has a coarse aggregate ratio of 2.5 or less, and the replacement rate BF is 20% or more and 30% or less. If this is the case, the unit water content W is 390 kg / m 3 Over 500kg / m 3 The powder water ratio (P / W) is 1.44 to 1.47, and the fine aggregate volume ratio (SL / ML) is 38% or less. In the fluidized soil according to the sixth embodiment, the powder amount P is 555 kg / m 3 Over 1000kg / m 3 The following is the result.

[0057] The method for determining the mix proportion of liquefied treated soil according to the seventh embodiment uses fly ash II conforming to JIS A6201 as fly ash, and determines the replacement rate BF to be in the range of 5% or more and less than 20% when the coarse aggregate ratio is 2.5 or less, and determines the powder amount P to be 300 kg / m 3 Over 1000kg / m 3 The unit water amount W that is within the range of the fluidity target flow value for the powder amount P is 300 kg / m 3 Over 500kg / m 3 In the following range, the powder water ratio (P / W) is determined to be 1.63 or more and not below the target value of the unconfined compressive strength, and the fine aggregate volume ratio (SL / ML) is determined to be 35% or less. In addition, in the method for determining the mix ratio of liquefied treated soil according to the seventh embodiment, the powder amount P is further set to 630 kg / m 3 In the above range, the unit water content W is 385 kg / m 3 Within the above range, it is preferable to determine the powder-water ratio (P / W) to be 2.75 or less.

[0058] The method for determining the mix proportion of liquefied treated soil according to the eighth embodiment uses fly ash II conforming to JIS A6201 as fly ash, and determines the replacement rate BF in the range of 20% to 40% when the fine aggregate has a coarse aggregate ratio of 2.5 or less, and determines the powder amount P to be 300 kg / m 3 Over 1000kg / m 3 The unit water amount W that is within the range of the fluidity target flow value for the powder amount P is 300 kg / m 3 Over 500kg / m 3 In the following range, the powder water ratio (P / W) is determined to be 1.63 or more and not below the target value of the unconfined compressive strength, and the fine aggregate volume ratio (SL / ML) is determined to be 33% or less. In addition, in the method for determining the mix ratio of liquefied treated soil according to the eighth embodiment, the powder amount P is further set to 640 kg / m 3 In the above range, the unit water content W is 400 kg / m 3 Within the above range, it is preferable to determine the powder-water ratio (P / W) to be 1.76 or less.

[0059] In the ninth embodiment, the method for determining the mix proportion of liquefied treated soil is as follows: fly ash type II conforming to JIS A6201 is used as fly ash, and the fine aggregate has a coarse aggregate ratio exceeding 2.5. The replacement rate BF is determined to be in the range of 5% or more and less than 20%, and the powder amount P is determined to be 300 kg / m 3 Over 1000kg / m 3 The unit water amount W that is within the range of the fluidity target flow value for the powder amount P is 300 kg / m 3 Over 500kg / m 3 In the following range, the powder water ratio (P / W) is determined to be 1.32 or more and not below the target value of the unconfined compressive strength, and the fine aggregate volume ratio (SL / ML) is determined to be 50% or less. In addition, in the ninth embodiment of the method for determining the mix proportion of liquefied treated soil, the powder amount P is set to 420 kg / m 3 In the above range, the unit water content W is 320 kg / m 3 Within the above range, it is preferable to determine the powder-water ratio (P / W) to be 2.65 or less.

[0060] The method for determining the mix proportion of liquefied treated soil according to the tenth embodiment uses fly ash type II conforming to JIS A6201 as fly ash, and determines the replacement rate BF to be in the range of 20% to 40% when the fine aggregate has a coarse aggregate ratio of more than 2.5, and determines the powder amount P to be 300 kg / m 3 Over 1000kg / m 3 The unit water amount W that is within the range of the fluidity target flow value for the powder amount P is 300 kg / m 3 Over 500kg / m 3 In the following range, the powder water ratio (P / W) is determined to be 1.32 or more and not below the target value of the unconfined compressive strength, and the fine aggregate volume ratio (SL / ML) is determined to be 48% or less. In the method for determining the mix proportion of liquefied treated soil according to the tenth embodiment, the powder amount P is further set to 430 kg / m 3 In the above range, the unit water content W is 335 kg / m 3 Within the above range, it is preferable to determine the powder-water ratio (P / W) to be 1.66 or less.

[0061] The method for determining the mix proportion of liquefied treated soil according to the eleventh embodiment uses fly ash powder not conforming to JIS A6201 and having an ignition loss of 5% or more as fly ash, and determines the replacement rate BF in the range of 5% or more and less than 20% when the fine aggregate has a coarse grain ratio of 2.5 or less, and determines the powder amount P to be 300 kg / m 3 Over 1000kg / m 3 The unit water amount W that is within the range of the fluidity target flow value for the powder amount P is 300 kg / m 3 Over 500kg / m 3 In the following range, the powder water ratio (P / W) is determined to be 1.44 or more and not below the target value of the unconfined compressive strength, and the fine aggregate volume ratio (SL / ML) is determined to be 40% or less. In the 11th embodiment of the method for determining the mix proportion of liquefied treated soil, the powder amount P is further set to 545 kg / m 3 In the above range, the unit water content W is 375 kg / m 3 Within the above range, it is preferable to determine the powder-water ratio (P / W) to be 2.65 or less.

[0062] The method for determining the mix proportion of liquefied treated soil according to the 12th embodiment uses fly ash powder not conforming to JIS A6201 and having an ignition loss of 5% or more as fly ash, and determines the replacement rate BF in the range of 20% to 40%, when the fine aggregate has a coarse grain ratio of 2.5 or less, and sets the powder amount P at 300 kg / m 3 Over 1000kg / m 3 The unit water amount W that is within the range of the fluidity target flow value for the powder amount P is 300 kg / m 3 Over 500kg / m 3 In the following range, the powder water ratio (P / W) is determined to be 1.44 or more and not below the target value of the unconfined compressive strength, and the fine aggregate volume ratio (SL / ML) is determined to be 38% or less. In addition, in the method for determining the mix ratio of liquefied treated soil according to the 12th embodiment, the powder amount P is further set to 555 kg / m 3 In the above range, the unit water content W is 390 kg / m 3 Within the above range, it is preferable to determine the powder-water ratio (P / W) to be 1.26 or less. [Industrial Applicability]

[0063] According to the present invention, it is possible to obtain liquefied treated soil that does not contain cement as a solidification material.

Claims

1. A fluidized soil containing ground granulated blast furnace slag, fly ash, water, and fine aggregate, and not containing cement as a solidification material, The unit water amount per unit volume of the water is W, The powder amount per unit volume of the ground granulated blast furnace slag and the fly ash is P, The fine aggregate unit volume per unit volume of the fine aggregate is SL, ML is a mortar unit volume per unit volume of the mortar composed of the water, the ground granulated blast furnace slag, the fly ash, and the fine aggregate; The replacement rate of the ground granulated blast furnace slag to the powder amount P is BF, When The fly ash is type II fly ash conforming to JIS A6201, The fine aggregate has a coarse aggregate ratio of 2.5 or less, If the replacement rate BF is 5% or more and less than 20%, The unit water amount W is 385 kg / m ３ Above 500 kg / m ３ The following: The powder-water ratio (P / W) is 1.63 or more and 2.75 or less, The fine aggregate volume ratio (SL / ML) was set at 35% or less. A liquefied treated soil characterized by the above.

2. A fluidized soil containing ground granulated blast furnace slag, fly ash, water, and fine aggregate, and not containing cement as a solidification material, The unit water amount per unit volume of the water is W, The powder amount per unit volume of the ground granulated blast furnace slag and the fly ash is P, The fine aggregate unit volume per unit volume of the fine aggregate is SL, ML is a mortar unit volume per unit volume of the mortar composed of the water, the ground granulated blast furnace slag, the fly ash, and the fine aggregate; The replacement rate of the ground granulated blast furnace slag to the powder amount P is BF, When The fly ash is type II fly ash conforming to JIS A6201, The fine aggregate has a coarse aggregate ratio of 2.5 or less, If the replacement rate BF is 20% or more and 40% or less, The unit water amount W is 400 kg / m ３ Above 500 kg / m ３ The following: The powder-water ratio (P / W) is 1.63 or more and 1.76 or less, The fine aggregate volume ratio (SL / ML) was set to 33% or less. A liquefied treated soil characterized by the above.

3. A fluidized soil containing ground granulated blast furnace slag, fly ash, water, and fine aggregate, and not containing cement as a solidification material, The unit water amount per unit volume of the water is W, The powder amount per unit volume of the ground granulated blast furnace slag and the fly ash is P, The fine aggregate unit volume per unit volume of the fine aggregate is SL, ML is a mortar unit volume per unit volume of the mortar composed of the water, the ground granulated blast furnace slag, the fly ash, and the fine aggregate; The replacement rate of the ground granulated blast furnace slag to the powder amount P is BF, When The fly ash is type II fly ash conforming to JIS A6201, The fine aggregate has a coarse aggregate ratio exceeding 2.5, If the replacement rate BF is 5% or more and less than 20%, The unit water amount W is 320 kg / m ３ Above 500 kg / m ３ The following: The powder / water ratio (P / W) is 1.32 or more and 2.65 or less, The fine aggregate volume ratio (SL / ML) is set to 50% or less. A liquefied treated soil characterized by the above.

4. A fluidized soil containing ground granulated blast furnace slag, fly ash, water, and fine aggregate, and not containing cement as a solidification material, The unit water amount per unit volume of the water is W, The powder amount per unit volume of the ground granulated blast furnace slag and the fly ash is P, The fine aggregate unit volume per unit volume of the fine aggregate is SL, ML is a mortar unit volume per unit volume of the mortar composed of the water, the ground granulated blast furnace slag, the fly ash, and the fine aggregate; The replacement rate of the ground granulated blast furnace slag to the powder amount P is BF, When The fly ash is type II fly ash conforming to JIS A6201, The fine aggregate has a coarse aggregate ratio exceeding 2.5, If the replacement rate BF is 20% or more and 40% or less, The unit water amount W is 335 kg / m ３ Above 500 kg / m ３ The following: The powder-water ratio (P / W) is 1.32 or more and 1.66 or less, The fine aggregate volume ratio (SL / ML) was set at 48% or less. A liquefied treated soil characterized by the above.

5. A fluidized soil containing ground granulated blast furnace slag, fly ash, water, and fine aggregate, and not containing cement as a solidification material, The unit water amount per unit volume of the water is W, The powder amount per unit volume of the ground granulated blast furnace slag and the fly ash is P, The fine aggregate unit volume per unit volume of the fine aggregate is SL, ML is a mortar unit volume per unit volume of the mortar composed of the water, the ground granulated blast furnace slag, the fly ash, and the fine aggregate; The replacement rate of the ground granulated blast furnace slag to the powder amount P is BF, When The fly ash is a fly ash raw powder that does not conform to JIS A6201 and has an ignition loss of 5% or more, The fine aggregate has a coarse aggregate ratio of 2.5 or less, If the replacement rate BF is 5% or more and less than 20%, The unit water amount W is 375 kg / m ３ Above 500 kg / m ３ The following: The powder / water ratio (P / W) is 1.44 or more and 2.65 or less, The fine aggregate volume ratio (SL / ML) is set to 40% or less. A liquefied treated soil characterized by the above.

6. A fluidized soil containing ground granulated blast furnace slag, fly ash, water, and fine aggregate, and not containing cement as a solidification material, The unit water amount per unit volume of the water is W, The powder amount per unit volume of the ground granulated blast furnace slag and the fly ash is P, The fine aggregate unit volume per unit volume of the fine aggregate is SL, ML is a mortar unit volume per unit volume of the mortar composed of the water, the ground granulated blast furnace slag, the fly ash, and the fine aggregate; The replacement rate of the ground granulated blast furnace slag to the powder amount P is BF, When The fly ash is a fly ash raw powder that does not conform to JIS A6201 and has an ignition loss of 5% or more, The fine aggregate has a coarse aggregate ratio of 2.5 or less, If the replacement rate BF is 20% or more and 30% or less, The unit water amount W is 390 kg / m ３ Above 500 kg / m ３ The following: The powder-water ratio (P / W) is 1.44 or more and 1.47 or less, The fine aggregate volume ratio (SL / ML) was set at 38% or less. A liquefied treated soil characterized by the above.

7. A method for determining the proportion of liquefied treated soil containing ground granulated blast furnace slag, fly ash, water, and fine aggregate, and not containing cement as a solidification material, comprising: The unit water amount per unit volume of the water is W, The powder amount per unit volume of the ground granulated blast furnace slag and the fly ash is P, The fine aggregate unit volume per unit volume of the fine aggregate is SL, ML is a mortar unit volume per unit volume of the mortar composed of the water, the ground granulated blast furnace slag, the fly ash, and the fine aggregate; The replacement rate of the ground granulated blast furnace slag to the powder amount P is BF, When As the fly ash, fly ash type II conforming to JIS A6201 is used, When the fine aggregate has a coarse aggregate ratio of 2.5 or less, The replacement rate BF is determined in the range of 5% or more and less than 20%, The powder amount P is 300 kg / m ３ Above 1000kg / m ３ The unit water amount W that is within the range of the fluidity target flow value for the powder amount P is set to 300 kg / m ３ Above 500 kg / m ３ Within the following range, the powder-water ratio (P / W) is determined to be 1.63 or more and not below the target value of unconfined compressive strength; The fine aggregate volume ratio (SL / ML) is determined to be 35% or less. A method for determining the composition of liquefied treated soil.

8. A method for determining the proportion of liquefied treated soil containing ground granulated blast furnace slag, fly ash, water, and fine aggregate, and not containing cement as a solidification material, comprising: The unit water amount per unit volume of the water is W, The powder amount per unit volume of the ground granulated blast furnace slag and the fly ash is P, The fine aggregate unit volume per unit volume of the fine aggregate is SL, ML is a mortar unit volume per unit volume of the mortar composed of the water, the ground granulated blast furnace slag, the fly ash, and the fine aggregate; The replacement rate of the ground granulated blast furnace slag to the powder amount P is BF, When As the fly ash, fly ash type II conforming to JIS A6201 is used, When the fine aggregate has a coarse aggregate ratio of 2.5 or less, The replacement rate BF is determined in the range of 20% or more and 40% or less, The powder amount P is 300 kg / m ３ Above 1000kg / m ３ The unit water amount W that is within the range of the fluidity target flow value for the powder amount P is set to 300 kg / m ３ Above 500 kg / m ３ Within the following range, the powder-water ratio (P / W) is determined to be 1.63 or more and not below the target value of unconfined compressive strength; The fine aggregate volume ratio (SL / ML) is determined to be 33% or less. A method for determining the composition of liquefied treated soil.

9. A method for determining the proportion of liquefied treated soil containing ground granulated blast furnace slag, fly ash, water, and fine aggregate, and not containing cement as a solidification material, comprising: The unit water amount per unit volume of the water is W, The powder amount per unit volume of the ground granulated blast furnace slag and the fly ash is P, The fine aggregate unit volume per unit volume of the fine aggregate is SL, ML is a mortar unit volume per unit volume of the mortar composed of the water, the ground granulated blast furnace slag, the fly ash, and the fine aggregate; The replacement rate of the ground granulated blast furnace slag to the powder amount P is BF, When As the fly ash, fly ash type II conforming to JIS A6201 is used, When the fine aggregate has a coarse aggregate ratio exceeding 2.5, The replacement rate BF is determined in the range of 5% or more and less than 20%, The powder amount P is 300 kg / m ３ Above 1000kg / m ３ The unit water amount W that is within the range of the fluidity target flow value for the powder amount P is set to 300 kg / m ３ Above 500 kg / m ３ Within the following range, the powder-water ratio (P / W) is determined so as to be 1.32 or more and not to fall below the target value of the unconfined compressive strength; Determine the fine aggregate volume ratio (SL / ML) to be 50% or less. A method for determining the composition of liquefied treated soil.

10. A method for determining the proportion of liquefied treated soil containing ground granulated blast furnace slag, fly ash, water, and fine aggregate, and not containing cement as a solidification material, comprising: The unit water amount per unit volume of the water is W, The powder amount per unit volume of the ground granulated blast furnace slag and the fly ash is P, The fine aggregate unit volume per unit volume of the fine aggregate is SL, ML is a mortar unit volume per unit volume of the mortar composed of the water, the ground granulated blast furnace slag, the fly ash, and the fine aggregate; The replacement rate of the ground granulated blast furnace slag to the powder amount P is BF, When As the fly ash, fly ash type II conforming to JIS A6201 is used, When the fine aggregate has a coarse aggregate ratio exceeding 2.5, The replacement rate BF is determined in the range of 20% or more and 40% or less, The powder amount P is 300 kg / m ３ Above 1000kg / m ３ The unit water amount W that is within the range of the fluidity target flow value for the powder amount P is set to 300 kg / m ３ Above 500 kg / m ３ Within the following range, the powder-water ratio (P / W) is determined so as to be 1.32 or more and not to fall below the target value of the unconfined compressive strength; The fine aggregate volume ratio (SL / ML) is determined to be 48% or less. A method for determining the composition of liquefied treated soil.

11. A method for determining the proportion of liquefied treated soil containing ground granulated blast furnace slag, fly ash, water, and fine aggregate, and not containing cement as a solidification material, comprising: The unit water amount per unit volume of the water is W, The powder amount per unit volume of the ground granulated blast furnace slag and the fly ash is P, The fine aggregate unit volume per unit volume of the fine aggregate is SL, ML is a mortar unit volume per unit volume of the mortar composed of the water, the ground granulated blast furnace slag, the fly ash, and the fine aggregate; The replacement rate of the ground granulated blast furnace slag to the powder amount P is BF, When As the fly ash, a fly ash raw powder having an ignition loss of 5% or more that does not conform to JIS A6201 is used, When the fine aggregate has a coarse aggregate ratio of 2.5 or less, The replacement rate BF is determined in the range of 5% or more and less than 20%, The powder amount P is 300 kg / m ３ Above 1000kg / m ３ The unit water amount W that is within the range of the fluidity target flow value for the powder amount P is set to 300 kg / m ３ Above 500 kg / m ３ Within the following range, the powder-water ratio (P / W) is determined to be 1.44 or more and not below the target value of unconfined compressive strength; The fine aggregate volume ratio (SL / ML) is determined to be 40% or less. A method for determining the composition of liquefied treated soil.

12. A method for determining the proportion of liquefied treated soil containing ground granulated blast furnace slag, fly ash, water, and fine aggregate, and not containing cement as a solidification material, comprising: The unit water amount per unit volume of the water is W, The powder amount per unit volume of the ground granulated blast furnace slag and the fly ash is P, The fine aggregate unit volume per unit volume of the fine aggregate is SL, ML is a mortar unit volume per unit volume of the mortar composed of the water, the ground granulated blast furnace slag, the fly ash, and the fine aggregate; The replacement rate of the ground granulated blast furnace slag to the powder amount P is BF, When As the fly ash, a fly ash raw powder having an ignition loss of 5% or more that does not conform to JIS A6201 is used, When the fine aggregate has a coarse aggregate ratio of 2.5 or less, The replacement rate BF is determined in the range of 20% or more and 40% or less, The powder amount P is 300 kg / m ３ Above 1000kg / m ３ The unit water amount W that is within the range of the fluidity target flow value for the powder amount P is set to 300 kg / m ３ Above 500 kg / m ３ Within the following range, the powder-water ratio (P / W) is determined to be 1.44 or more and not below the target value of unconfined compressive strength; The fine aggregate volume ratio (SL / ML) is determined to be 38% or less. A method for determining the composition of liquefied treated soil.

13. The fluidity target flow value is in the range of 200 mm to 300 mm. A method for determining the proportion of liquefied treated soil according to any one of claims 7 to 12.

14. The bleeding rate of the liquefied treated soil is set to 3% or less. A method for determining the proportion of liquefied treated soil according to any one of claims 7 to 12.

15. The target unconfined compressive strength is the unconfined compressive strength of the liquefied treated soil at a material age of 28 days, and the target unconfined compressive strength is 100 kN / m ２ ~1000kN / m ２ Let's say A method for determining the proportion of liquefied treated soil according to any one of claims 7 to 12.

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