JP2012031618A5 - - Google Patents
Download PDFInfo
- Publication number
- JP2012031618A5 JP2012031618A5 JP2010171237A JP2010171237A JP2012031618A5 JP 2012031618 A5 JP2012031618 A5 JP 2012031618A5 JP 2010171237 A JP2010171237 A JP 2010171237A JP 2010171237 A JP2010171237 A JP 2010171237A JP 2012031618 A5 JP2012031618 A5 JP 2012031618A5
- Authority
- JP
- Japan
- Prior art keywords
- mass
- mixed material
- steelmaking slag
- clay
- slaked lime
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Description
本発明はこのような知見に基づきなされたもので、以下を要旨とするものである。
［1］製鋼スラグを混合して浚渫土の改質を行う際に、浚渫土と製鋼スラグの混合材（x）の強度を推定する方法であって、下記（1）式に基づき、混合材（x）の２８日養生後の一軸圧縮強度の推定値ｆ（Ｎ／ｃｍ ２ ）を求めることを特徴とする改質浚渫土の強度推定方法。
ｆ＝α×Ｄs×Ｓg×｛（Ｃo−Ｃh）／Ｗa｝ …（1）
但し
Ｄs＝［混合材（x）中の粒径０．０７５ｍｍ以下の浚渫土粒子の質量］／［混合材（x）の固形分の質量］×１００（％）
Ｓg＝［混合材（x）中の粒径２ｍｍ以下の製鋼スラグ粒子の質量］／［混合材（x）の製鋼スラグの質量］×１００（％）
Ｃh：事前の試験において、改質対象である浚渫土に消石灰を混合し、その混合材の２８日養生後の一軸圧縮強度が５０ｋＮ／ｍ２となる場合の混合材１ｍ３中の消石灰の質量（ｋｇ）×１．５
Ｃo：製鋼スラグが含有する遊離ＣａＯであって、混合材（x）１ｍ３中の遊離ＣａＯの質量（ｋｇ）
Ｗa：混合材（x）１ｍ３中の水分の質量（ｋｇ）
α：Ｃhを求めるに当たって使用する消石灰の種類により決まる定数
The present invention has been made on the basis of such findings and has the following gist.
[1] A method for estimating the strength of the mixed material (x) of the clay and the steelmaking slag when the steelmaking slag is mixed and reforming the clay, and based on the following formula (1) A method for estimating the strength of the modified dredged material, characterized in that an estimated value f (N / cm 2 ) of the uniaxial compressive strength after the 28-day curing of (x) is obtained.
f = α × Ds × Sg × {(Co−Ch) / W a} (1)
However, Ds = [mass of clay particles having a particle size of 0.075 mm or less in the mixed material (x)] / [mass of solid content of the mixed material (x)] × 100 (%)
Sg = [mass of steelmaking slag particles having a particle diameter of 2 mm or less in the mixture (x)] / [mass of steelmaking slag of the mixture (x)] × 100 (%)
Ch: The mass of slaked lime in 1 m 3 of the mixed material when slaked lime is mixed with the clay to be modified in the prior test and the uniaxial compressive strength after the 28-day curing of the mixed material becomes 50 kN / m 2. (Kg) x 1.5
Co: free CaO contained in steelmaking slag, and the mass of free CaO in 1 m 3 of the mixed material (x) (kg)
Wa: Mass of moisture in mixed material (x) 1 m 3 (kg)
α: Constant determined by the type of slaked lime used to determine Ch
［2］製鋼スラグを混合して浚渫土の改質を行う方法であって、浚渫土と製鋼スラグの混合材（x）の２８日養生後の一軸圧縮強度の目標値をｆＯ （Ｎ／ｃｍ ２ ）とした場合、下記（2）式に基づき浚渫土に対する製鋼スラグの混合量を決定することを特徴とする浚渫土の改質方法。
ｆＯ＝α×Ｄs×Ｓg×｛（Ｃo−Ｃh）／Ｗa｝ …（2）
但し
Ｄs＝［混合材（x）中の粒径０．０７５ｍｍ以下の浚渫土粒子の質量］／［混合材（x）の固形分の質量］×１００（％）
Ｓg＝［混合材（x）中の粒径２ｍｍ以下の製鋼スラグ粒子の質量］／［混合材（x）の製鋼スラグの質量］×１００（％）
Ｃh：事前の試験において、改質対象である浚渫土に消石灰を混合し、その混合材の２８日養生後の一軸圧縮強度が５０ｋＮ／ｍ２となる場合の混合材１ｍ３中の消石灰の質量（ｋｇ）×１．５
Ｃo：製鋼スラグが含有する遊離ＣａＯであって、混合材（x）１ｍ３中の遊離ＣａＯの質量（ｋｇ）
Ｗa：混合材（x）１ｍ３中の水分の質量（ｋｇ）
α：Ｃhを求めるに当たって使用する消石灰の種類により決まる定数
[2] A method of modifying the clay by mixing steelmaking slag, wherein the target value of the uniaxial compressive strength after the 28-day curing of the mixed material (x) of clay and steelmaking slag is set to f O (N / cm 2 ) , the mixing method of the clay is determined by determining the amount of steelmaking slag mixed with the clay based on the following formula (2).
f O = α × Ds × Sg × {(Co−Ch) / W a} (2)
However, Ds = [mass of clay particles having a particle size of 0.075 mm or less in the mixed material (x)] / [mass of solid content of the mixed material (x)] × 100 (%)
Sg = [mass of steelmaking slag particles having a particle diameter of 2 mm or less in the mixture (x)] / [mass of steelmaking slag of the mixture (x)] × 100 (%)
Ch: The mass of slaked lime in 1 m 3 of the mixed material when slaked lime is mixed with the clay to be modified in the prior test and the uniaxial compressive strength after the 28-day curing of the mixed material becomes 50 kN / m 2. (Kg) x 1.5
Co: free CaO contained in steelmaking slag, and the mass of free CaO in 1 m 3 of the mixed material (x) (kg)
Wa: Mass of moisture in mixed material (x) 1 m 3 (kg)
α: Constant determined by the type of slaked lime used to determine Ch
以下、本願の第一の発明である改質浚渫土の強度推定方法について説明する。
この改質浚渫土の強度推定方法は、製鋼スラグを混合して浚渫土の改質を行う際に、浚渫土と製鋼スラグの混合材（x）の強度を推定する方法であり、下記（1）式に基づき、混合材（x）の２８日養生後の一軸圧縮強度の推定値ｆ（Ｎ／ｃｍ ２ ）を求めるものである。
ｆ＝α×Ｄs×Ｓg×｛（Ｃo−Ｃh）／Ｗa｝ …（1）
但し
Ｄs＝［混合材（x）中の粒径０．０７５ｍｍ以下の浚渫土粒子の質量］／［混合材（x）の固形分の質量］×１００（％）
Ｓg＝［混合材（x）中の粒径２ｍｍ以下の製鋼スラグ粒子の質量］／［混合材（x）の製鋼スラグの質量］×１００（％）
Ｃh：事前の試験において、改質対象である浚渫土に消石灰を混合し、その混合材の２８日養生後の一軸圧縮強度が５０ｋＮ／ｍ２となる場合の混合材１ｍ３中の消石灰の質量（ｋｇ）×１．５
Ｃo：製鋼スラグが含有する遊離ＣａＯであって、混合材（x）１ｍ３中の遊離ＣａＯの質量（ｋｇ）
Ｗa：混合材（x）１ｍ３中の水分の質量（ｋｇ）
α：Ｃhを求めるに当たって使用する消石灰の種類により決まる定数
Hereinafter, the strength estimation method of the modified clay, which is the first invention of the present application, will be described.
The strength estimation method of the modified clay is a method for estimating the strength of the mixed material (x) of the clay and the steelmaking slag when the steelmaking slag is mixed to improve the clay. ) To obtain an estimated value f (N / cm 2 ) of uniaxial compressive strength after 28 days of curing of the mixed material (x).
f = α × Ds × Sg × {(Co−Ch) / W a} (1)
However, Ds = [mass of clay particles having a particle size of 0.075 mm or less in the mixed material (x)] / [mass of solid content of the mixed material (x)] × 100 (%)
Sg = [mass of steelmaking slag particles having a particle diameter of 2 mm or less in the mixture (x)] / [mass of steelmaking slag of the mixture (x)] × 100 (%)
Ch: The mass of slaked lime in 1 m 3 of the mixed material when slaked lime is mixed with the clay to be modified in the prior test and the uniaxial compressive strength after the 28-day curing of the mixed material becomes 50 kN / m 2. (Kg) x 1.5
Co: free CaO contained in steelmaking slag, and the mass of free CaO in 1 m 3 of the mixed material (x) (kg)
Wa: Mass of moisture in mixed material (x) 1 m 3 (kg)
α: Constant determined by the type of slaked lime used to determine Ch
以上の結果から、以下に示すような特定の強度推定式を用いることにより、改質対象の浚渫土に試薬（消石灰）を添加して所定の強度が得られる試薬量を求めるだけで、浚渫土と製鋼スラグの混合材の強度を的確に推定できることが判った。すなわち、事前の試験において、改質対象である浚渫土に消石灰を混合し、その混合材の２８日養生後の一軸圧縮強度が５０ｋＮ／ｍ２となる場合の消石灰の配合量を求めておき、下記（1）式に基づき、混合材（x）の２８日養生後の一軸圧縮強度の推定値ｆ（Ｎ／ｃｍ ２ ）を求めるものである。
ｆ＝α×Ｄs×Ｓg×｛（Ｃo−Ｃh）／Ｗa｝ …（1）
但し
Ｄs＝［混合材（x）中の粒径０．０７５ｍｍ以下の浚渫土粒子の質量］／［混合材（x）の固形分の質量］×１００（％）
Ｓg＝［混合材（x）中の粒径２ｍｍ以下の製鋼スラグ粒子の質量］／［混合材（x）の製鋼スラグの質量］×１００（％）
Ｃh：事前の試験において、改質対象である浚渫土に消石灰を混合し、その混合材の２８日養生後の一軸圧縮強度が５０ｋＮ／ｍ２となる場合の混合材１ｍ３中の消石灰の質量（ｋｇ）×１．５
Ｃo：製鋼スラグが含有する遊離ＣａＯであって、混合材（x）１ｍ３中の遊離ＣａＯの質量（ｋｇ）
Ｗa：混合材（x）１ｍ３中の水分の質量（ｋｇ）
α：Ｃhを求めるに当たって使用する消石灰の種類により決まる定数
From the above results, by using a specific strength estimation formula as shown below, it is only necessary to add a reagent (slaked lime) to the modification target clay and obtain the amount of reagent that gives a predetermined strength. It was found that the strength of steel and slag mixed material can be estimated accurately. That is, in the preliminary test, slaked lime is mixed with the clay to be modified, and the blended amount of slaked lime when the uniaxial compressive strength after the 28-day curing of the mixed material is 50 kN / m 2 , Based on the following formula (1), the estimated value f (N / cm 2 ) of the uniaxial compressive strength after the 28-day curing of the mixed material (x) is obtained.
f = α × Ds × Sg × {(Co−Ch) / W a} (1)
However, Ds = [mass of clay particles having a particle size of 0.075 mm or less in the mixed material (x)] / [mass of solid content of the mixed material (x)] × 100 (%)
Sg = [mass of steelmaking slag particles having a particle diameter of 2 mm or less in the mixture (x)] / [mass of steelmaking slag of the mixture (x)] × 100 (%)
Ch: The mass of slaked lime in 1 m 3 of the mixed material when slaked lime is mixed with the clay to be modified in the prior test and the uniaxial compressive strength after the 28-day curing of the mixed material becomes 50 kN / m 2. (Kg) x 1.5
Co: free CaO contained in steelmaking slag, and the mass of free CaO in 1 m 3 of the mixed material (x) (kg)
Wa: Mass of moisture in mixed material (x) 1 m 3 (kg)
α: Constant determined by the type of slaked lime used to determine Ch
ここで、浚渫土と製鋼スラグの混合材における強度発現は、セメントにおけるポゾラン反応と同様の機構であり、製鋼スラグから供給されるＣａと浚渫土のＳｉ分とが反応して、Ｃａ−Ｓｉ−Ｈ２Ｏ化合物を生成することにより強度が発現する。したがって、強度発現にはＣａ量、Ｓｉ量、およびセメントなどの反応の場合に強度と逆比例している水量がそれぞれ影響すると考えられる。このような観点と、上述した製鋼スラグや浚渫土の各種特性を組み合わせて解析した結果、上記の強度推定式が見出されたものである。すなわち、Ｃａ量に関与するパラメータとして、製鋼スラグからのＣａ供給量があり、これには混合材中の粒径２ｍｍ以下のスラグ粒子の質量を混合材中の製鋼スラグの質量で除した比率Ｓgと遊離ＣａＯ量Ｃoの寄与がある。一方、浚渫土がＣａを吸着することによる反応抑制効果があり、この反応抑制効果は、事前の試験で求められる、混合材の所定の強度が発現するまでの消石灰量が指標となり、したがって、反応に寄与する遊離ＣａＯは（Ｃo−Ｃh）で表される。また、セメントにおける結合材／水と同様の考え方で、強度発現は（Ｃo−Ｃh）と混合材に含まれる水分（浚渫土が持ち込んだ海水や水、或いはさらに添加され海水や水）との比（Ｃo−Ｃh）／Ｗaに大きく依存する。なお、Ｃhについて、「混合材の所定の強度が発現するまでの消石灰の質量×１．５」としたのは、図２に示されるように、強度発現する製鋼スラグの添加率と消石灰の添加率は強い相関があり、消石灰の添加量と製鋼スラグ中の遊離ＣａＯ含有率を元に計算した製鋼スラグ中の遊離ＣａＯ含有量とを比較すると、製鋼スラグ中の遊離ＣａＯ含有量は消石灰の１．５倍相当を要するからである。一方、Ｓｉ分については、浚渫土のうちの土の量に起因するパラメータは、混合材中の粒径０．０７５ｍｍ以下の浚渫土粒子の比率Ｄsの寄与がある。これらを掛け合わせることで、強度指標の骨格が求められ、これを一軸圧縮強度に適用させるための定数αを掛けたものが、混合材（x）の一軸圧縮強度の推定値ｆ（Ｎ／ｃｍ ２ ）となる。
ここで、定数αはＣhを求めるに当たって使用する消石灰の種類（例えば、活性度を左右する粒度及び／又は純度）により決まり、通常は、３〜４程度の範囲で選択される。
Here, the strength expression in the mixed material of the clay and the steelmaking slag is the same mechanism as the pozzolanic reaction in the cement, and Ca supplied from the steelmaking slag reacts with the Si content of the clay and Ca-Si- Strength is developed by generating the H 2 O compound. Accordingly, it is considered that the amount of water that is inversely proportional to the strength in the case of reactions such as Ca amount, Si amount, and cement affects the strength development. As a result of analyzing by combining such viewpoints and various characteristics of the steelmaking slag and clay described above, the above strength estimation formula has been found. That is, as a parameter related to the amount of Ca, there is a Ca supply amount from steelmaking slag, which is a ratio Sg obtained by dividing the mass of slag particles having a particle size of 2 mm or less in the mixed material by the mass of steelmaking slag in the mixed material. And free CaO amount Co. On the other hand, there is a reaction suppression effect due to the adsorption of Ca by the clay, and this reaction suppression effect is an index based on the amount of slaked lime obtained until the predetermined strength of the mixed material is obtained, which is obtained in a prior test. The free CaO that contributes to is represented by (Co-Ch). In addition, the strength development is the ratio between (Co-Ch) and the moisture contained in the mixed material (seawater and water brought in by dredged soil, or seawater and water added further) in the same way as the binder / water in cement. It largely depends on (Co-Ch) / Wa. As for Ch, “mass of slaked lime until a predetermined strength of the mixed material is developed × 1.5” is set as shown in FIG. 2. The rate has a strong correlation. Comparing the added amount of slaked lime with the free CaO content in steelmaking slag calculated based on the free CaO content in steelmaking slag, the free CaO content in steelmaking slag is 1 This is because the equivalent of 5 times is required. On the other hand, with respect to the Si component, the parameter due to the amount of soil in the clay has a contribution of the ratio Ds of clay particles having a particle size of 0.075 mm or less in the mixed material. By multiplying these, the skeleton of the strength index is obtained, and this is multiplied by a constant α for applying to the uniaxial compressive strength, and the estimated value f (N / cm ) of the uniaxial compressive strength of the mixed material (x). 2 ) .
Here, the constant α is determined by the type of slaked lime used for obtaining Ch (for example, the particle size and / or purity that affects the activity), and is usually selected in the range of about 3 to 4.
次に、本願の第二の発明である浚渫土の改質方法について説明する。
製鋼スラグを混合して浚渫土の改質を行うに当たり、混合材の目標強度（設計強度）が与えられれば、上記強度推定式により目標強度を得るための製鋼スラグの混合量を求めることができる。
すなわち、本発明の浚渫土の改質方法では、浚渫土と製鋼スラグの混合材（x）の２８日養生後の一軸圧縮強度の目標値をｆＯ （Ｎ／ｃｍ ２ ）とした場合、下記（2）式に基づき浚渫土に対する製鋼スラグの混合量を決定する。
ｆＯ＝α×Ｄs×Ｓg×｛（Ｃo−Ｃh）／Ｗa｝ …（2）
但し
Ｄs＝［混合材（x）中の粒径０．０７５ｍｍ以下の浚渫土粒子の質量］／［混合材（x）の固形分の質量］×１００（％）
Ｓg＝［混合材（x）中の粒径２ｍｍ以下の製鋼スラグ粒子の質量］／［混合材（x）の製鋼スラグの質量］×１００（％）
Ｃh：事前の試験において、改質対象である浚渫土に消石灰を混合し、その混合材の２８日養生後の一軸圧縮強度が５０ｋＮ／ｍ２となる場合の混合材１ｍ３中の消石灰の質量（ｋｇ）×１．５
Ｃo：製鋼スラグが含有する遊離ＣａＯであって、混合材（x）１ｍ３中の遊離ＣａＯの質量（ｋｇ）
Ｗa：混合材（x）１ｍ３中の水分の質量（ｋｇ）
α：Ｃhを求めるに当たって使用する消石灰の種類により決まる定数
Next, a method for reforming clay, which is the second invention of the present application, will be described.
When the steelmaking slag is mixed to improve the clay, if the target strength (design strength) of the mixed material is given, the mixing amount of the steelmaking slag for obtaining the target strength can be obtained by the above strength estimation formula. .
That is, in the modification method of dredged material of the present invention, when the target value of 28 days uniaxial compressive strength after curing of the mixed material and dredged material steel slag (x) was f O (N / cm 2) , the following (2) Based on the formula, determine the amount of steelmaking slag mixed with the clay .
f O = α × Ds × Sg × {(Co−Ch) / W a} (2)
However, Ds = [mass of clay particles having a particle size of 0.075 mm or less in the mixed material (x)] / [mass of solid content of the mixed material (x)] × 100 (%)
Sg = [mass of steelmaking slag particles having a particle diameter of 2 mm or less in the mixture (x)] / [mass of steelmaking slag of the mixture (x)] × 100 (%)
Ch: The mass of slaked lime in 1 m 3 of the mixed material when slaked lime is mixed with the clay to be modified in the prior test and the uniaxial compressive strength after the 28-day curing of the mixed material becomes 50 kN / m 2. (Kg) x 1.5
Co: free CaO contained in steelmaking slag, and the mass of free CaO in 1 m 3 of the mixed material (x) (kg)
Wa: Mass of moisture in mixed material (x) 1 m 3 (kg)
α: Constant determined by the type of slaked lime used to determine Ch
さきに述べたように、本発明の強度推定式により求められる混合材の強度は、実測値との相関が高いため、上記（2）式により目標強度ｆＯに応じた製鋼スラグの混合量を決定することにより、製鋼スラグを目標強度ｆＯに応じた適正な混合量で浚渫材に混合することができる。
浚渫土に所定量の製鋼スラグを混合して強度改質を行う場合、混合方法としては、浚渫された泥土等に対して所定量の製鋼スラグを投入し、混ぜ合わせればよい。混ぜ合わせる方法としては、例えば、バックホーなどの重機を用いて混合する方法、連続式ミキサーに泥土と製鋼スラグを適正比率で投入しながら混合する方法、バッチ式ミキサーに泥土と製鋼スラグを所定量計量して投入して混合する方法などが適用できる。また、混合材の施工方法としては、例えば、混合直後の流動性がある状態でトレミー管などを通して海中に施工する方法、一旦、土運船などに取りおき、少し硬化が始まった状態でバケット投入や底開バージにより施工する方法などが適用できる。また、陸域で使用する場合には、例えば、混合後にトラック等で運搬して施工する方法、泥土発生現地で製鋼スラグを所定量混合し、そのまま養生する方法などが適用できる。
製鋼スラグの混合で改質された浚渫土（混合材）は、主に水域の土工材や盛土材などに好適に利用されるが、陸上の土工材などとしても利用できる。
As described above, since the strength of the mixed material obtained by the strength estimation formula of the present invention has a high correlation with the actual measurement value, the amount of steelmaking slag mixed according to the target strength f 2 O is calculated by the above formula (2). By determining, the steelmaking slag can be mixed with the brazing material in an appropriate mixing amount according to the target strength f 2 O.
When a predetermined amount of steelmaking slag is mixed with dredged soil to improve the strength, the mixing method may be to put a predetermined amount of steelmaking slag into the dredged mud and mix it. As a method of mixing, for example, a method of mixing using a heavy machine such as a backhoe, a method of mixing while adding mud and steelmaking slag in an appropriate ratio to a continuous mixer, and a predetermined amount of mud and steelmaking slag are measured in a batch mixer The method of charging and mixing can be applied. In addition, the construction method of the mixed material is, for example, a method of constructing in the sea through a tremmy pipe etc. in a state where there is fluidity immediately after mixing. And a method of construction by bottom open barge can be applied. In addition, when used in the land, for example, a method of transporting and mixing with a truck after mixing, a method of mixing a predetermined amount of steelmaking slag at the site where mud is generated, and curing as it is can be applied.
The dredged soil (mixed material) modified by mixing steelmaking slag is preferably used mainly as an earthwork material or embankment material in water, but can also be used as an earthwork material on land.
［実施例２］
表１に示す浚渫土Ａに対して製鋼スラグを混合して強度改質するに当たり、２８日養生後の一軸圧縮強度の目標値（平均値）を５００ｋＮ／ｍ２とした。製鋼スラグとしては、遊離ＣａＯ含有量が３．５質量％のものを使用した。使用する製鋼スラグについて、実施時における粒径２ｍｍ以下のスラグ粒子の比率を粒度分布測定により評価した上で、（2）式により製鋼スラグの混合量を２８質量％と決定した。この混合割合でバッチ式の大型ミキサーにより浚渫土と製鋼スラグを大量混合し、複数個所のサンプルを採取した。混合材の２８日養生後の一軸圧縮強度を実測した結果を図８に示す。これによれば、大量製造であるために浚渫土や製鋼スラグの粒度にある程度の変動があり、このため強度にはある程度の幅はあるものの、平均値は５０６ｋＮ／ｍ２である。したがって、本発明の浚渫土の改質方法によれば、設計強度に応じた製鋼スラグの適正な混合量を決定することができ、浚渫土を所望の設計強度に改質することができることが確認できた。
[Example 2]
When the steelmaking slag was mixed with the clay A shown in Table 1 to improve the strength, the target value (average value) of the uniaxial compressive strength after curing for 28 days was set to 500 kN / m 2 . As the steelmaking slag, one having a free CaO content of 3.5% by mass was used. For steel slag to be used, after the ratio of the particle diameter 2mm or less slag particles during implementation assessed by a particle size distribution measurement was determined to 28% by weight mixture of more steelmaking slag (2). At this mixing ratio, a large amount of batch type mixer was used to mix a large amount of clay and steelmaking slag, and samples were taken at a plurality of locations. FIG. 8 shows the results of actual measurement of the uniaxial compressive strength after 28 days of curing of the mixed material. According to this, because of mass production, there is some variation in the grain size of the clay and steelmaking slag, and although there is some range in strength, the average value is 506 kN / m 2 . Therefore, according to the clay reforming method of the present invention, it is possible to determine an appropriate mixing amount of the steelmaking slag according to the design strength, and to confirm that the clay can be modified to a desired design strength. did it.
Claims (2)
下記（1）式に基づき、混合材（x）の２８日養生後の一軸圧縮強度の推定値ｆ（Ｎ／ｃｍ ２ ）を求めることを特徴とする改質浚渫土の強度推定方法。
ｆ＝α×Ｄs×Ｓg×｛（Ｃo−Ｃh）／Ｗa｝ …（1）
但し
Ｄs＝［混合材（x）中の粒径０．０７５ｍｍ以下の浚渫土粒子の質量］／［混合材（x）の固形分の質量］×１００（％）
Ｓg＝［混合材（x）中の粒径２ｍｍ以下の製鋼スラグ粒子の質量］／［混合材（x）の製鋼スラグの質量］×１００（％）
Ｃh：事前の試験において、改質対象である浚渫土に消石灰を混合し、その混合材の２８日養生後の一軸圧縮強度が５０ｋＮ／ｍ２となる場合の混合材１ｍ３中の消石灰の質量（ｋｇ）×１．５
Ｃo：製鋼スラグが含有する遊離ＣａＯであって、混合材（x）１ｍ３中の遊離ＣａＯの質量（ｋｇ）
Ｗa：混合材（x）１ｍ３中の水分の質量（ｋｇ）
α：Ｃhを求めるに当たって使用する消石灰の種類により決まる定数 A method for estimating the strength of a mixed material (x) of clay and steelmaking slag when mixing steelmaking slag and modifying the clay,
A method for estimating the strength of the modified clay characterized by obtaining an estimated value f (N / cm 2 ) of uniaxial compressive strength after 28 days of curing of the mixed material (x) based on the following formula (1).
f = α × Ds × Sg × {(Co−Ch) / W a} (1)
However, Ds = [mass of clay particles having a particle size of 0.075 mm or less in the mixed material (x)] / [mass of solid content of the mixed material (x)] × 100 (%)
Sg = [mass of steelmaking slag particles having a particle diameter of 2 mm or less in the mixture (x)] / [mass of steelmaking slag of the mixture (x)] × 100 (%)
Ch: The mass of slaked lime in 1 m 3 of the mixed material when slaked lime is mixed with the clay to be modified in the prior test and the uniaxial compressive strength after the 28-day curing of the mixed material becomes 50 kN / m 2. (Kg) x 1.5
Co: free CaO contained in steelmaking slag, and the mass of free CaO in 1 m 3 of the mixed material (x) (kg)
Wa: Mass of moisture in mixed material (x) 1 m 3 (kg)
α: Constant determined by the type of slaked lime used to determine Ch
浚渫土と製鋼スラグの混合材（x）の２８日養生後の一軸圧縮強度の目標値をｆＯ （Ｎ／ｃｍ ２ ）とした場合、下記（2）式に基づき浚渫土に対する製鋼スラグの混合量を決定することを特徴とする浚渫土の改質方法。
ｆＯ＝α×Ｄs×Ｓg×｛（Ｃo−Ｃh）／Ｗa｝ …（2）
但し
Ｄs＝［混合材（x）中の粒径０．０７５ｍｍ以下の浚渫土粒子の質量］／［混合材（x）の固形分の質量］×１００（％）
Ｓg＝［混合材（x）中の粒径２ｍｍ以下の製鋼スラグ粒子の質量］／［混合材（x）の製鋼スラグの質量］×１００（％）
Ｃh：事前の試験において、改質対象である浚渫土に消石灰を混合し、その混合材の２８日養生後の一軸圧縮強度が５０ｋＮ／ｍ２となる場合の混合材１ｍ３中の消石灰の質量（ｋｇ）×１．５
Ｃo：製鋼スラグが含有する遊離ＣａＯであって、混合材（x）１ｍ３中の遊離ＣａＯの質量（ｋｇ）
Ｗa：混合材（x）１ｍ３中の水分の質量（ｋｇ）
α：Ｃhを求めるに当たって使用する消石灰の種類により決まる定数 A method of reforming clay by mixing steelmaking slag,
If mixed material dredged material and steel slag 28 days target value of the uniaxial compressive strength after curing of (x) was f O (N / cm 2) , a mixture of steel slag for dredged material on the basis of the following equation (2) A method for reforming dredged soil, wherein the amount is determined.
f O = α × Ds × Sg × {(Co−Ch) / W a} (2)
However, Ds = [mass of clay particles having a particle size of 0.075 mm or less in the mixed material (x)] / [mass of solid content of the mixed material (x)] × 100 (%)
Sg = [mass of steelmaking slag particles having a particle diameter of 2 mm or less in the mixture (x)] / [mass of steelmaking slag of the mixture (x)] × 100 (%)
Ch: The mass of slaked lime in 1 m 3 of the mixed material when slaked lime is mixed with the clay to be modified in the prior test and the uniaxial compressive strength after the 28-day curing of the mixed material becomes 50 kN / m 2. (Kg) x 1.5
Co: free CaO contained in steelmaking slag, and the mass of free CaO in 1 m 3 of the mixed material (x) (kg)
Wa: Mass of moisture in mixed material (x) 1 m 3 (kg)
α: Constant determined by the type of slaked lime used to determine Ch
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010171237A JP5728845B2 (en) | 2010-07-30 | 2010-07-30 | Method for estimating strength of modified dredged soil and method for modifying dredged soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010171237A JP5728845B2 (en) | 2010-07-30 | 2010-07-30 | Method for estimating strength of modified dredged soil and method for modifying dredged soil |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2012031618A JP2012031618A (en) | 2012-02-16 |
| JP2012031618A5 true JP2012031618A5 (en) | 2013-09-12 |
| JP5728845B2 JP5728845B2 (en) | 2015-06-03 |
Family
ID=45845340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2010171237A Active JP5728845B2 (en) | 2010-07-30 | 2010-07-30 | Method for estimating strength of modified dredged soil and method for modifying dredged soil |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP5728845B2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6020990B2 (en) * | 2012-06-26 | 2016-11-02 | 五洋建設株式会社 | Quality control method for clay and steelmaking slag mixed material |
| JP2015101830A (en) * | 2013-11-21 | 2015-06-04 | 一般財団法人砂防・地すべり技術センター | Sand arrestation soil cement method utilizing organic soil as construction material |
| JP6409581B2 (en) * | 2015-01-13 | 2018-10-24 | 新日鐵住金株式会社 | Strength prediction method for modified soil |
| JP6464904B2 (en) * | 2015-04-16 | 2019-02-06 | 新日鐵住金株式会社 | Method for predicting strength of modified soil and method for producing modified soil |
| JP6851882B2 (en) * | 2017-04-04 | 2021-03-31 | 日本製鉄株式会社 | Manufacturing method of Calcia modified soil |
| JP6891062B2 (en) * | 2017-07-11 | 2021-06-18 | 清水建設株式会社 | Method of estimating the strength of the root compaction |
| KR102097590B1 (en) * | 2017-12-14 | 2020-04-06 | 재단법인 포항산업과학연구원 | Improved dredged soil comprising steel slag and temporary road using the same |
| JP6960840B2 (en) * | 2017-12-14 | 2021-11-05 | 清水建設株式会社 | Soil cement strength judgment method and strength judgment system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5293111A (en) * | 1976-01-30 | 1977-08-05 | Kobe Steel Ltd | Method of improving and reinforcing poor subsoil |
| JP5014961B2 (en) * | 2007-11-16 | 2012-08-29 | 新日本製鐵株式会社 | Mud modification material and modification method |
-
2010
- 2010-07-30 JP JP2010171237A patent/JP5728845B2/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2012031618A5 (en) | ||
| JP5728845B2 (en) | Method for estimating strength of modified dredged soil and method for modifying dredged soil | |
| AU2011294528B2 (en) | Cement composition, method for producing mixed material and method for producing cement composition | |
| JP2008037891A (en) | Method for preparing soil cement slurry | |
| JP2021183699A (en) | Soil solidification method | |
| JP6032013B2 (en) | Soft soil improvement material, soft soil improvement method using the same, and soft ground improvement method | |
| JP5790597B2 (en) | Method for predicting strength of modified soil and method for producing modified soil using the same | |
| Ahmed et al. | Stabilisation of soft soil with recycled plaster admixtures | |
| JP7133281B2 (en) | Dredged soil modification method | |
| JP2018002509A (en) | Neutralization suppression of cement-based cured product and chloride ion permeation suppression method | |
| JP6487133B1 (en) | Ground improvement method | |
| Wong et al. | A review on experimental investigations of peat stabilization | |
| JP6464904B2 (en) | Method for predicting strength of modified soil and method for producing modified soil | |
| JP6498716B2 (en) | Ground improvement method | |
| JP3886980B2 (en) | Improved soil formulation design method | |
| JP7121717B2 (en) | Method for estimating physical properties of hardened slurry | |
| JP2007217255A (en) | Method of preparing soil cement slurry | |
| JP6409581B2 (en) | Strength prediction method for modified soil | |
| WO2021161868A1 (en) | Soil improvement method | |
| JP2021127446A (en) | Ground improvement method | |
| JP6639723B1 (en) | Ground improvement method | |
| JP2016074559A (en) | Cement slurry and ground improvement method | |
| JP6331514B2 (en) | Slightly acidic solidification method for soil | |
| CN106032314B (en) | A kind of concrete and preparation method thereof | |
| JP6204099B2 (en) | Ground improvement method |