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JP6990140B2 - Manufacturing method of solidified soil - Google Patents
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JP6990140B2 - Manufacturing method of solidified soil - Google Patents

Manufacturing method of solidified soil Download PDF

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JP6990140B2
JP6990140B2 JP2018071694A JP2018071694A JP6990140B2 JP 6990140 B2 JP6990140 B2 JP 6990140B2 JP 2018071694 A JP2018071694 A JP 2018071694A JP 2018071694 A JP2018071694 A JP 2018071694A JP 6990140 B2 JP6990140 B2 JP 6990140B2
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soil
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solidified
water content
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JP2019183419A (en
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博 新舎
寛一 柳橋
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Penta Ocean Construction Co Ltd
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Description

本発明は、土質材料の含水比、この土質材料に対する固化材の混合比率の決定方法、及び固化処理土の製造方法に関する。本願では、土質材料とは土粒子と水との混合物を意味し、固化材は粉体を意味する。 The present invention relates to a method for determining the water content of a soil material, a method for determining a mixing ratio of a solidifying material with respect to the soil material, and a method for producing solidified treated soil. In the present application, the soil material means a mixture of soil particles and water, and the solidifying material means powder.

浚渫土は、処分場が不足しているため、有効利用が求められている。浚渫土の大きな処分方法の一つは、浚渫土に固化材を混合して埋立材として利用することであり、各地の建設工事などで既に利用されている。この場合の固化処理土の圧縮強度は、設計基準強度がおよそ0.1~0.2メガニュートン毎平方メートル[MN/m2]であり、安全率を考慮した室内配合強度は0.2~0.5メガニュートン毎平方メートル[MN/m2]である。 Dredged soil is required to be used effectively due to the lack of disposal sites. One of the major disposal methods for dredged soil is to mix the dredged soil with a solidifying material and use it as a landfill material, which has already been used in construction work in various places. In this case, the compressive strength of the solidified soil has a design standard strength of about 0.1 to 0.2 meganewtons per square meter [MN / m 2 ], and the indoor compounding strength considering the safety factor is 0.2 to 0. .5 meganewtons per square meter [MN / m 2 ].

さらなる用途拡大のため、浚渫土を用いて圧縮強度が10メガニュートン毎平方メートル[MN/m2]以上の高強度固化処理土ブロックを製造することも検討されている。この高強度固化処理土は、砂礫や自然石の代替品として利用することが考えられる。 In order to further expand the application, it is also considered to manufacture a high-strength solidified soil block having a compressive strength of 10 meganewtons per square meter [MN / m 2 ] or more using dredged soil. This high-strength solidified soil can be used as a substitute for gravel and natural stone.

圧縮強度が約10メガニュートン毎平方メートル[MN/m2]以上の固化処理土は、JISのA5003-1995「石材」において、強度的に準硬石の分類に入り、海水中で利用してもカルシウム分の溶出による劣化がほとんど生じないため、長期的安定性が期待される、という特長がある。 Solidified soil with a compressive strength of about 10 meganewtons per square meter [MN / m 2 ] or more is classified as semi-hard stone in terms of strength in JIS A5003-1995 "Stone", and can be used in seawater. It has the advantage that long-term stability is expected because it hardly deteriorates due to the elution of calcium.

非特許文献1には、圧縮強度が10メガニュートン毎平方メートル[MN/m2]以上の固化処理土を製造する方法として、高圧フィルタープレスを用いる方法が記載されている。この方法は、高含水比に調整した浚渫土に固化材を混合した後、4メガニュートン毎平方メートル[MN/m2]の高圧で脱水し、高強度の固化処理土を製造する方法である。 Non-Patent Document 1 describes a method using a high-pressure filter press as a method for producing solidified soil having a compressive strength of 10 meganewtons per square meter [MN / m 2 ] or more. This method is a method of producing high-strength solidified soil by mixing a solidifying material with dredged soil adjusted to a high water content and then dehydrating it at a high pressure of 4 meganewtons per square meter [MN / m 2 ].

山下祐佳,善功企,陳光斉,笠間清伸:脱水固化処理による大型浚渫土ブロックの均質性および強度特性,土木学会論文集B3 (海洋開発), Vol.67, No.2, pp.440-444, 2011.Yuka Yamashita, Kouyoshi Chen, Mitsuyoshi Chen, Kiyonobu Kasama: Homogeneity and strength characteristics of large dredged soil blocks by dehydration solidification treatment, JSCE Proceedings B3 (Ocean Development), Vol.67, No.2, pp.440-444, 2011.

しかしながら、非特許文献1に記載の方法はコストが高く、大量施工には向かないという問題がある。 However, the method described in Non-Patent Document 1 has a problem that the cost is high and it is not suitable for mass construction.

本発明の目的の一つは、高圧フィルタープレスを用いる方法に比べて安価に10メガニュートン毎平方メートル以上の固化処理土を製造することである。 One of the objects of the present invention is to produce solidified soil of 10 meganewtons per square meter or more at a lower cost than the method using a high-pressure filter press.

本発明の請求項1に係る含水比及び混合比率の決定方法は、固化処理土を製造するための土質材料の含水比、及び該土質材料に対する固化材の混合比率を決定する方法であって、前記土質材料の塑性限界を測定するステップと、前記固化処理土に含まれる水の量から、前記塑性限界に基づき特定される前記土質材料の塑性分に相当する水の量と、前記固化材の水和反応に必要な水の量とを差し引いた量である余裕水の量が、所定の閾値以上となるように、前記含水比及び前記混合比率を決定するステップと、を備える含水比及び混合比率の決定方法である。 The method for determining the water content ratio and the mixing ratio according to claim 1 of the present invention is a method for determining the water content ratio of the soil material for producing the solidified soil and the mixing ratio of the solidifying material to the soil material. The step of measuring the plastic limit of the soil material, the amount of water corresponding to the plastic component of the soil material specified based on the plastic limit from the amount of water contained in the solidified soil, and the solidified material. A water content ratio and a mixture comprising: It is a method of determining the ratio.

本発明の請求項2に係る固化処理土の製造方法は、請求項1に記載の含水比及び混合比率の決定方法により決定された前記含水比により土質材料の含水比を調整し、決定された前記固化材の混合比率により前記土質材料と前記固化材とを混合して固化処理土を製造する固化処理土の製造方法である。 The method for producing solidified soil according to claim 2 of the present invention was determined by adjusting the water content of the soil material according to the water content ratio determined by the method for determining the water content ratio and the mixing ratio according to claim 1. This is a method for producing solidified soil by mixing the soil material and the solidifying material according to the mixing ratio of the solidifying material to produce the solidified soil.

本発明によれば、高圧フィルタープレスを用いる方法に比べて安価に10メガニュートン毎平方メートル以上の固化処理土を製造することができる。 According to the present invention, it is possible to produce solidified soil of 10 meganewtons per square meter or more at a lower cost than the method using a high-pressure filter press.

土質材料の含水比と該土質材料に対する固化材の混合比率の決定方法の例を示す図。The figure which shows the example of the method of determining the water content ratio of a soil material and the mixing ratio of a solidifying material with respect to the soil material. 水/固化材重量比と圧縮強度との関係を示す図。The figure which shows the relationship between the weight ratio of water / solidifying material and compressive strength. 配合試験の結果例を示す図。The figure which shows the result example of the compounding test.

<混合比率の決定方法>
図1は、土質材料の含水比と該土質材料に対する固化材の混合比率の決定方法の例を示す図である。固化処理土の製造者は、まず、固化処理土に利用する浚渫土等の土質材料の原料(原料土という)を選択し、この土質材料の塑性限界を測定する(ステップS101)。この塑性限界の測定は、例えばJISのA1205-2009「土の液性限界・塑性限界試験方法」に準じて行われる。
<Method of determining the mixing ratio>
FIG. 1 is a diagram showing an example of a method for determining the water content ratio of a soil material and the mixing ratio of a solidifying material with respect to the soil material. The manufacturer of the solidified soil first selects a raw material (referred to as raw material soil) for a soil material such as dredged soil to be used for the solidified soil, and measures the plastic limit of the soil material (step S101). The measurement of the plastic limit is performed according to, for example, JIS A1205-2009 "Soil Liquid Limit / Plastic Limit Test Method".

次に、製造者は、土質材料の含水比の割合、及びその土質材料に対する固化材の割合を変化させた混合比率の候補を策定し(ステップS102)、各候補について水の量から、土質材料の塑性分に相当する水の量と、固化材の水和反応に必要な水の量とを差し引いた値を「余裕水の量」として特定する(ステップS103)。 Next, the manufacturer formulates candidates for a mixing ratio in which the ratio of the water content of the soil material and the ratio of the solidifying material to the soil material are changed (step S102), and for each candidate, the soil material is selected from the amount of water. The value obtained by subtracting the amount of water corresponding to the plastic component of the above and the amount of water required for the hydration reaction of the solidifying material is specified as the "amount of surplus water" (step S103).

製造者は、候補の中から、ステップS103で特定した余裕水の量が負になる候補を除外する(ステップS104)。なお、この例では、余裕水の量が負になる候補が除外されるが、製造者は、候補の中から余裕水の量が予め決められた閾値を下回る候補を除外してもよい。 The manufacturer excludes the candidates having a negative amount of surplus water specified in step S103 from the candidates (step S104). In this example, the candidate whose amount of surplus water is negative is excluded, but the manufacturer may exclude the candidate whose amount of surplus water is less than a predetermined threshold value from the candidates.

製造者は、除外後の各候補に対応する複数のサンプルを用意し(ステップS105)、そのそれぞれを28日間にわたって養生し(ステップS106)、その後、各サンプルの圧縮強度を測定する(ステップS107)。この圧縮強度の測定は、例えばJISのA1108-2006「コンクリート用圧縮強度試験」に準じて行われる。 The manufacturer prepares a plurality of samples corresponding to each candidate after exclusion (step S105), cures each of them for 28 days (step S106), and then measures the compressive strength of each sample (step S107). .. This compressive strength is measured, for example, according to JIS A1108-2006 "Compressive strength test for concrete".

圧縮強度が測定されると、製造者は、各サンプルについて測定された値と室内配合強度の目標値とを比較し、目標強度を満たすと推定されるサンプルの土質材料の含水比(水/土粒子重量比)と、該土質材料に対する固化材の混合比率(水/固化材重量比)を決定する(ステップS108)。この際の手順としては、土質材料の含水比を先に決定し、その後、固化材の混合比率を決定してもよい。 When the compressive strength is measured, the manufacturer compares the measured value for each sample with the target value of the indoor compound strength and the water content ratio (water / soil) of the soil material of the sample estimated to meet the target strength. The particle weight ratio) and the mixing ratio of the solidifying material to the soil material (water / solidifying material weight ratio) are determined (step S108). As a procedure at this time, the water content ratio of the soil material may be determined first, and then the mixing ratio of the solidifying material may be determined.

<固化処理土の製造方法>
上述した通り、室内配合強度の目標値を満たす固化処理土を製造するための土質材料の含水比、及びその土質材料に対する固化材の混合比率が決定される。そして、この決定された含水比、及び固化材の混合比率を用いて、原料土を乾燥又は加水して土質材料を製造し、この土質材料と固化材とを混合することで、固化処理土が製造される。
<Manufacturing method of solidified soil>
As described above, the water content ratio of the soil material for producing the solidified treated soil satisfying the target value of the indoor compounding strength and the mixing ratio of the solidified material with the soil material are determined. Then, using the determined water content ratio and the mixing ratio of the solidifying material, the raw material soil is dried or hydrated to produce a soil material, and the soil material and the solidifying material are mixed to obtain the solidified soil. Manufactured.

<余裕水の考え方の説明>
以下に、土質材料の含水比と、固化材の混合比率、及び余裕水の考え方を実施例に基づいて説明する。
表1は、固化処理土に利用する原料土の物理特性を示す表である。なお、この例では、原料土として、浚渫土である名古屋港海成粘土を使用した。
<Explanation of the concept of surplus water>
Hereinafter, the water content ratio of the soil material, the mixing ratio of the solidifying material, and the concept of surplus water will be described based on Examples.
Table 1 is a table showing the physical characteristics of the raw material soil used for the solidified soil. In this example, the dredged soil, Nagoya Port Marine Clay, was used as the raw material soil.

上述した通り、固化処理土の製造者は、原料土(浚渫土)の塑性限界、すなわち、土質材料の塑性限界を測定した。表1に示す通り、試験の結果、この浚渫土の塑性限界は24.4パーセント[%]であることがわかった。 As described above, the producer of the solidified soil measured the plastic limit of the raw soil (dredged soil), that is, the plastic limit of the soil material. As shown in Table 1, as a result of the test, it was found that the plastic limit of this dredged soil was 24.4% [%].

Figure 0006990140000001
Figure 0006990140000001

次に、製造者は、土質材料の含水比と、この土質材料に対する固化材の混合比率を変化させた混合案(以下、配合案という)を策定した。表2は、この配合案で製造された試料(サンプルともいう)の試験結果を示す表である。なお、土質材料の含水比[%]は「100×Ww/Ws」で表され、土質材料に対する固化材の割合は「Wc/(Ws+Ww)」で表される。 Next, the manufacturer formulated a mixing plan (hereinafter referred to as a compounding plan) in which the water content ratio of the soil material and the mixing ratio of the solidifying material to the soil material were changed. Table 2 is a table showing the test results of the sample (also referred to as a sample) produced by this formulation plan. The water content ratio [%] of the soil material is represented by "100 x Ww / Ws", and the ratio of the solidifying material to the soil material is represented by "Wc / (Ws + Ww)".

Figure 0006990140000002
Figure 0006990140000002

ここで、固化材には太平洋セメント株式会社製の普通ポルトランドセメントを、室内配合における水には水道水を用いることとした。このポルトランドセメントの水和反応に必要な水の量は、固化材であるポルトランドセメントの重量「Wc」に対して0.6倍の重量であることがわかっている。したがって、固化材の水和反応に必要な水の量「Ww(H)」は、次の式(1)により計算される。
Ww(H)=0.6×Wc …(1)
Here, it was decided to use ordinary Portland cement manufactured by Taiheiyo Cement Co., Ltd. as the solidifying material and tap water as the water in the indoor formulation. It is known that the amount of water required for the hydration reaction of this Portland cement is 0.6 times the weight "Wc" of the solidifying material Portland cement. Therefore, the amount of water "Ww (H)" required for the hydration reaction of the solidifying material is calculated by the following formula (1).
Ww (H) = 0.6 × Wc… (1)

また、上述した通り、土質材料である名古屋港海成粘土の塑性限界は24.4%である。したがって、塑性限界に基づき特定される土質材料の塑性分に相当する水の量「Ww(wp)」は、土質材料の重量「Ws」を用いて次の式(2)により計算される。
Ww(wp)=0.244×Ws …(2)
Further, as described above, the plastic limit of Nagoya Port marine clay, which is a soil material, is 24.4%. Therefore, the amount of water "Ww (wp)" corresponding to the plastic component of the soil material specified based on the plastic limit is calculated by the following equation (2) using the weight "Ws" of the soil material.
Ww (wp) = 0.244 × Ws… (2)

そして、余裕水の量は、次の式(3)により、固化処理土に用いられる水の量「Ww」から、上述した「Ww(H)」と、「Ww(wp)」とを差し引いて計算される。
余裕水の量=Ww-Ww(H)-Ww(wp) …(3)
Then, the amount of surplus water is obtained by subtracting the above-mentioned "Ww (H)" and "Ww (wp)" from the amount of water "Ww" used for the solidified soil according to the following formula (3). It is calculated.
Amount of surplus water = Ww-Ww (H) -Ww (wp) ... (3)

製造者は、試料番号「1」から「15」までの候補について余裕水の量を特定する。この場合、試料番号「7」から「11」までは、余裕水の量が負になる。したがって、製造者は、この試料番号「7」から「11」までの配合案を除外し、その他の試料番号の候補について定めた混合比率に沿ってサンプルを作製する。 The manufacturer specifies the amount of surplus water for the candidates from sample numbers "1" to "15". In this case, the amount of surplus water is negative from the sample numbers "7" to "11". Therefore, the manufacturer excludes the formulation proposals of the sample numbers "7" to "11" and prepares the sample according to the mixing ratio defined for the other sample number candidates.

図2は、水/固化材重量比と圧縮強度との関係を示す図である。図2には、作製されたサンプルを28日間にわたって養生した後、圧縮強度を測定した結果が表されている。ここでは説明のため、除外した候補についてもいくつかのサンプルを作製し、養生して圧縮強度を測定した。 FIG. 2 is a diagram showing the relationship between the water / solidifying material weight ratio and the compressive strength. FIG. 2 shows the results of measuring the compressive strength after curing the prepared sample for 28 days. Here, for the sake of explanation, some samples were prepared for the excluded candidates, cured, and the compressive strength was measured.

図2に示すように、余裕水量が負の試験結果(破線枠内)は、図内に示した強度推定ラインから大きく外れており、除外した候補は他の候補とは異なる傾向を示している。 As shown in FIG. 2, the test results with a negative margin water amount (inside the broken line frame) are far from the strength estimation line shown in the figure, and the excluded candidates tend to be different from the other candidates. ..

すなわち、これらの配合では余裕水の量が負であって、固化材の水和反応に用いられる水が十分に確保されず、サンプルに不均一な箇所が生じて圧縮強度が低下したものと推察される。 That is, it is presumed that in these formulations, the amount of surplus water was negative, sufficient water used for the hydration reaction of the solidifying material was not secured, and non-uniform parts were generated in the sample, resulting in a decrease in compressive strength. Will be done.

製造者は、余裕水の量が正であった配合で作製されたサンプルのみについて、その水/固化材重量比と圧縮強度との関係を特定する。水/固化材重量比「Ww/Wc」と圧縮強度「qu」とには、次の式(4)の関係があることがわかっている。
u=a×(Ww/Wc)-b …(4)
The manufacturer identifies the relationship between the water / solidifying material weight ratio and the compressive strength only for samples made in formulations where the amount of margin water was positive. It is known that the water / solidifying material weight ratio “Ww / Wc” and the compressive strength “q u ” are related to the following equation (4).
q u = a × (Ww / Wc) -b … (4)

すなわち、式(4)は、固化体の圧縮強度は、その固化体の水/固化材重量比の累乗に比例することを示している。製造者は、実際に測定したデータを用いて、最小二乗法等により式(4)の係数a、bを求める補間計算を行い、近似式を得た。その結果、a=20.273、b=1.144という係数が算出された。つまり、水/固化材重量比「Ww/Wc」と、材齢28日の圧縮強度「qu28」とには、次の式(5)の関係があることがわかった。ただし、式(5)は、水/固化材重量比「Ww/Wc」と、材齢28日のサンプルについて測定した圧縮強度の平均値「qu28」に対する式であり、含水比「100×Ww/Ws」に対して、圧縮強度は約20%の変動があることがわかる。
u28=20.273×(Ww/Wc)-1.144 …(5)
That is, the formula (4) shows that the compressive strength of the solidified body is proportional to the power of the water / solidified material weight ratio of the solidified body. Using the actually measured data, the manufacturer performed an interpolation calculation to obtain the coefficients a and b of the equation (4) by the least squares method or the like, and obtained an approximate equation. As a result, the coefficients a = 20.273 and b = 1.144 were calculated. That is, it was found that the water / solidifying material weight ratio “Ww / Wc” and the compressive strength “q u28 ” at the age of 28 days are related to the following equation (5). However, the formula (5) is a formula for the water / solidifying material weight ratio “Ww / Wc” and the average value of compressive strength “q u28 ” measured for a sample of 28 days of age, and has a water content ratio of “100 × Ww”. It can be seen that the compressive strength fluctuates by about 20% with respect to "/ Ws".
q u28 = 20.273 × (Ww / Wc) -1.144 … (5)

<実施例>
室内配合での強度目標値は、施工現場における不均一性等を考慮して10メガニュートン毎平方メートル[MN/m2]よりも高い15メガニュートン毎平方メートル[MN/m2]に設定した。
<Example>
The strength target value for indoor compounding was set to 15 meganewtons per square meter [MN / m 2 ], which is higher than 10 meganewtons per square meter [MN / m 2 ] in consideration of non-uniformity at the construction site.

次に、製造者は、配合案の候補を策定した。配合案は、含水比「100×Ww/Ws」を60%、80%、100%とし、水/固化材重量比「Ww/Wc」を1.2、2.0、4.0とした。これらの配合の余裕水量はすべて正である。 Next, the manufacturer formulated a candidate formulation. In the formulation plan, the water content ratio "100 x Ww / Ws" was set to 60%, 80% and 100%, and the water / solidifying material weight ratio "Ww / Wc" was set to 1.2, 2.0 and 4.0. The amount of surplus water in these formulations is all positive.

表3は、上記の組み合わせによる混合比率の候補で製造された試料の試験結果を示す表である。試料番号「13」から「15」までは表2に記述したものであり、いずれも水/固化材重量比「Ww/Wc」が「1.2」である。 Table 3 is a table showing the test results of the samples produced by the candidates of the mixing ratio by the above combination. The sample numbers "13" to "15" are described in Table 2, and the water / solidifying material weight ratio "Ww / Wc" is "1.2" in each case.

また試料番号「16」「17」は、含水比が、試料番号「13」と同じ「60%」になるものであり、試料番号「16」は、水/固化材重量比「Ww/Wc」が「2」、試料番号「17」は、水/固化材重量比「Ww/Wc」が「4」になるものである。 Further, the sample numbers "16" and "17" have a water content ratio of "60%", which is the same as the sample number "13", and the sample number "16" is a water / solidifying material weight ratio "Ww / Wc". Is "2" and the sample number "17" means that the water / solidifying material weight ratio "Ww / Wc" is "4".

同様に、試料番号「18」「19」は、含水比が、試料番号「14」と同じ「80%」になるものであり、試料番号「18」は、水/固化材重量比「Ww/Wc」が「2」、試料番号「19」は、水/固化材重量比「Ww/Wc」が「4」になるものである。 Similarly, sample numbers "18" and "19" have a water content ratio of "80%", which is the same as sample number "14", and sample number "18" is a water / solidifying material weight ratio "Ww /". When "Wc" is "2" and sample number "19", the water / solidifying material weight ratio "Ww / Wc" is "4".

そして、試料番号「20」「21」は、含水比が、試料番号「15」と同じ「100%」になるものであり、試料番号「20」は、水/固化材重量比「Ww/Wc」が「2」、試料番号「21」は、水/固化材重量比「Ww/Wc」が「4」になるものである。 The sample numbers "20" and "21" have a water content ratio of "100%", which is the same as the sample number "15", and the sample number "20" is a water / solidifying material weight ratio "Ww / Wc". "2" and the sample number "21" mean that the water / solidifying material weight ratio "Ww / Wc" is "4".

Figure 0006990140000003
Figure 0006990140000003

図3は、配合試験の結果例を示す図である。図3には、上述した試料番号「13」から「21」までのサンプルの水/固化材重量比と、これらサンプルを28日間にわたって養生した後、圧縮強度を測定した結果とが対応付けて表されている。 FIG. 3 is a diagram showing an example of the result of the compounding test. FIG. 3 shows the water / solidifying material weight ratios of the above-mentioned samples from sample numbers “13” to “21” and the results of measuring the compressive strength after curing these samples for 28 days. Has been done.

製造者は、表3及び図3に示したデータを参照し、含水比wを「60%」「80%」「100%」の3つの水準で比較したところ、含水比「80%」の圧縮強度が、含水比「60%」及び「100%」の圧縮強度に比べて、水/固化材重量比に関わらず高いことがわかった。 The manufacturer referred to the data shown in Table 3 and FIG. 3, and compared the water content ratio w at the three levels of "60%", "80%", and "100%", and found that the water content ratio was "80%". It was found that the strength was higher regardless of the water / solidifying material weight ratio than the compressive strength of the water content ratios "60%" and "100%".

そこで、製造者は、含水比「80%」の圧縮強度のプロットについて最小二乗法等により式(4)の係数a、bを求める補間計算を行い、近似式を得た。その結果、a=22.647、b=1.061という係数が算出された。つまり、この条件下で、水/固化材重量比「Ww/Wc」と、材齢28日の圧縮強度「qu28」とには、次の式(6)の関係があることがわかった。
u28=22.647×(Ww/Wc)-1.061 …(6)
Therefore, the manufacturer performed an interpolation calculation to obtain the coefficients a and b of the equation (4) by the least squares method or the like for the plot of the compressive strength having a water content ratio of "80%", and obtained an approximate equation. As a result, the coefficients a = 22.647 and b = 1.061 were calculated. That is, under these conditions, it was found that the water / solidifying material weight ratio “Ww / Wc” and the compressive strength “q u28 ” at the age of 28 days are related to the following equation (6).
q u28 = 22.647 × (Ww / Wc) -1.061 … (6)

製造者は、式(6)で示される近似曲線に対して、室内配合強度の目標値を当てはめ、対応する水/固化材重量比「Ww/Wc」を決定した。室内配合強度の目標値は15メガニュートン毎平方メートル[MN/m2]に設定しており、この目標値に対応する水/固化材重量比「Ww/Wc」は、図3により1.5に決定された。 The manufacturer applied the target value of the indoor compounding strength to the approximate curve represented by the formula (6), and determined the corresponding water / solidifying material weight ratio “Ww / Wc”. The target value of indoor compounding strength is set to 15 meganewtons per square meter [MN / m 2 ], and the water / solidifying material weight ratio “Ww / Wc” corresponding to this target value is set to 1.5 according to Fig. 3. It has been determined.

すなわち、製造者は、上述した試験結果を考慮して、含水比を80%にした土質材料の量を1356kg/m3とし、固化材である粉体状のポルトランドセメントの量を402kg/m3とした。 That is, in consideration of the above-mentioned test results, the manufacturer sets the amount of soil material having a water content of 80% to 1356 kg / m 3 and the amount of powdered Portland cement as a solidifying material to 402 kg / m 3 . And said.

製造者は、陸上の仮置き場で長期間天日乾燥された名古屋港海成粘土(浚渫土)を原料土とした。この原料土は天日乾燥のため含水比が80%を下回っており、製造者は、不足した水分を水道水で補うことにより、固化処理土の製造に使用する土質材料の含水比を調整した。そして、製造者はバッチ式ミキサーを用いて、この土質材料とポルトランドセメントとを混合した。 The manufacturer used Nagoya Port marine clay (dredged soil), which had been dried in the sun for a long period of time at a temporary storage site on land, as the raw material soil. The water content of this raw soil is less than 80% due to sun drying, and the manufacturer adjusted the water content of the soil material used to produce the solidified soil by supplementing the lack of water with tap water. .. The manufacturer then used a batch mixer to mix this soil material with Portland cement.

次に、製造者は、混合によって製造した固化処理土を0.3メートル[m]の厚みで撒き出し、ハンドガイドタイプの振動ローラを用いて締固め、約1日間放置した後に、固化した処理土をブレーカー付きバックホウで幅、奥行き、高さのいずれもが30センチメートル[cm]程度の破片に破砕した。そしてその28日後に、製造者は、破砕した破片から作製したサンプルで圧縮強度を測定した。測定の結果、材齢28日のこのサンプルの圧縮強度は10メガニュートン毎平方メートル[MN/m2]以上であったため、海水中での捨石材として利用した。 Next, the manufacturer sprinkled the solidified treated soil produced by mixing to a thickness of 0.3 m [m], compacted it using a hand guide type vibrating roller, left it for about 1 day, and then solidified the treated soil. Was crushed into pieces having a width, depth, and height of about 30 cm [cm] with a backhoe equipped with a breaker. Twenty-eight days later, the manufacturer measured the compressive strength with a sample made from the crushed debris. As a result of the measurement, the compressive strength of this sample at the age of 28 days was 10 meganewtons per square meter [MN / m 2 ] or more, so it was used as a rubble material in seawater.

以上、説明した通り、土質材料の塑性限界を測定し、固化処理土に含まれる水の量から、測定したこの塑性限界に基づき特定される土質材料の塑性分に相当する水の量と、固化材の水和反応に必要な水の量とを差し引いた量である余裕水の量が、所定の閾値以上となるように、土質材料の含水比及び土質材料に対する固化材の混合比率を決定することで、高圧フィルタープレスを用いる方法に比べて安価に10メガニュートン毎平方メートル[MN/m2]以上の固化処理土を製造することが可能となることがわかった。 As explained above, the plastic limit of the soil material is measured, and the amount of water corresponding to the plastic content of the soil material specified based on the measured plastic limit from the amount of water contained in the solidified treated soil and solidification. The water content ratio of the soil material and the mixing ratio of the solidifying material to the soil material are determined so that the amount of surplus water, which is the amount obtained by subtracting the amount of water required for the hydration reaction of the material, is equal to or more than a predetermined threshold value. As a result, it was found that it is possible to produce solidified soil of 10 meganewtons per square meter [MN / m 2 ] or more at a lower cost than the method using a high-pressure filter press.

Claims (2)

固化処理土を製造するための土質材料の含水比、及び該土質材料に対する固化材の混合比率を決定する方法であって、
前記土質材料の塑性限界を測定するステップと、
前記固化処理土に含まれる水の量から、前記塑性限界に基づき特定される前記土質材料の塑性分に相当する水の量と、前記固化材の水和反応に必要な水の量とを差し引いた量である余裕水の量が、所定の閾値以上となるように、前記含水比及び前記混合比率を決定するステップと、を備える含水比及び混合比率の決定方法。
A method for determining the water content ratio of a soil material for producing solidified soil and the mixing ratio of the solidified material to the soil material.
The step of measuring the plastic limit of the soil material and
From the amount of water contained in the solidified soil, the amount of water corresponding to the plastic content of the soil material specified based on the plastic limit and the amount of water required for the hydration reaction of the solidified material are subtracted. A method for determining a water content ratio and a mixing ratio, comprising:
請求項1に記載の含水比及び混合比率の決定方法により決定された前記含水比により土質材料の含水比を調整し、決定された前記固化材の混合比率により前記土質材料と前記固化材とを混合して固化処理土を製造する固化処理土の製造方法。 The water content of the soil material is adjusted by the water content ratio determined by the method for determining the water content ratio and the mixing ratio according to claim 1, and the soil material and the solidifying material are mixed by the determined mixing ratio of the solidifying material. A method for producing solidified soil by mixing and producing solidified soil.
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JP2006326422A (en) 2005-05-24 2006-12-07 Fujita Corp Mud improvement method and mud improvement material addition rate evaluation method
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寺師 昌明、奥村 樹郎、光本 司,石灰安定処理土の基本的特性に関する研究(第1報),港湾技術研究所報告,第16巻 第1号,日本,国立研究開発法人 港湾空港技術研究所,1977年07月03日

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