JPH0243281A - Material for foundation conditioning - Google Patents
Material for foundation conditioningInfo
- Publication number
- JPH0243281A JPH0243281A JP63193638A JP19363888A JPH0243281A JP H0243281 A JPH0243281 A JP H0243281A JP 63193638 A JP63193638 A JP 63193638A JP 19363888 A JP19363888 A JP 19363888A JP H0243281 A JPH0243281 A JP H0243281A
- Authority
- JP
- Japan
- Prior art keywords
- slag
- converter slag
- gypsum
- improvement material
- strength
- 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.)
- Pending
Links
- 239000000463 material Substances 0.000 title claims abstract description 44
- 230000003750 conditioning effect Effects 0.000 title abstract 3
- 239000002893 slag Substances 0.000 claims abstract description 77
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 22
- 239000010440 gypsum Substances 0.000 claims abstract description 22
- 239000002245 particle Substances 0.000 claims abstract description 16
- 239000000843 powder Substances 0.000 claims abstract description 9
- 230000006872 improvement Effects 0.000 claims description 40
- 239000000654 additive Substances 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000002689 soil Substances 0.000 description 23
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 20
- 239000000203 mixture Substances 0.000 description 14
- 239000000292 calcium oxide Substances 0.000 description 10
- 235000012255 calcium oxide Nutrition 0.000 description 10
- 230000000694 effects Effects 0.000 description 6
- 239000004570 mortar (masonry) Substances 0.000 description 6
- 239000011398 Portland cement Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 239000004568 cement Substances 0.000 description 4
- 238000006477 desulfuration reaction Methods 0.000 description 4
- 230000023556 desulfurization Effects 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 239000006227 byproduct Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 229910002596 FexO Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 description 1
- 235000010261 calcium sulphite Nutrition 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012669 compression test Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
Landscapes
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、転炉スラグを利用した地盤改良材に関する。[Detailed description of the invention] (Industrial application field) The present invention relates to a ground improvement material using converter slag.
（従来の技術）
軟弱地盤を強化するための地盤改良材として、従来、生
石灰およびセメントが使用されてきたが、価格が高いた
め大量の地盤改良材を使用することができず、その結果
、地盤改良材の効果を充分に発揮させることができない
ことも多かった。(Conventional technology) Quicklime and cement have traditionally been used as ground improvement materials to strengthen soft ground, but due to their high prices, it was not possible to use large quantities of the soil improvement materials, and as a result, the soil In many cases, the effects of the improved materials could not be fully demonstrated.
また、生石灰を主材とした地盤改良材の場合、膨張性に
間しては良い特性を示すが、その含有■が多すぎると十
分な強度を発揮することができず、さらに、処理した地
盤が強アルカリ性となり、周辺の地下水その他の水域に
アルカリ汚染の影響が考えられるなどの欠点も有してい
た。In addition, in the case of a ground improvement material based on quicklime, it shows good properties in terms of expansion, but if it contains too much, it will not be able to exhibit sufficient strength. It also had the disadvantage of being strongly alkaline, potentially causing alkali contamination to surrounding groundwater and other water bodies.
地盤改良材に鉄鋼生産の副生物である転炉スラグを利用
する方法は、特開昭５３−８４３１１号および同５６−
４１９１６号などに開示されている。A method of using converter slag, which is a by-product of steel production, as a ground improvement material is disclosed in Japanese Patent Application Laid-open No. 53-84311 and No. 56-
No. 41916, etc.
特開昭５３−８４３１１号においては、遊離のＣａＯを
５〜１０％含むための吸収膨張効果を存するとともに、
ＦｅＯを含むためにＦｅＯが水と接触してＦｅｚＯ，と
なり周辺地盤に対して膠結作用を示して団粒させる効果
を有する転炉スラグを地盤改良材の一成分とすることで
生石灰の含有量を下げ、低価格化および高性能化をはか
っている。In JP-A No. 53-84311, there is an absorption expansion effect due to the inclusion of 5 to 10% free CaO, and
By using converter slag as a component of the ground improvement material, the content of quicklime can be reduced by using converter slag as a component of the ground improvement material. We are working to lower prices, lower prices, and improve performance.
特開昭５６−４１９１６号においては、転炉スラグの添
加材として生石灰を全く用いず、その代わりに製鉄所の
溶鉱炉から出る高炉スラグを急冷、粉砕した水砕スラグ
と少量のポルトランドセメントを用いている。この場合
、セメントが少量であるため転炉スラグおよび水砕スラ
グの水和硬化がきわめて徐々に進行し、過剰な遊離石灰
の生成が少なくなることから、改良地盤がアルカリ性に
汚染される心配はなくなる。また、製鉄過程において副
生成物として大量に発生する水砕スラグを高価な生石灰
の代わりに利用するため、より低価格な地盤改良材とな
る。In JP-A No. 56-41916, no quicklime was used as an additive for converter slag, and instead, granulated slag made by rapidly cooling and crushing blast furnace slag from a blast furnace at a steel mill and a small amount of Portland cement were used. There is. In this case, since the amount of cement is small, the hydration hardening of the converter slag and granulated slag proceeds very gradually, and the generation of excess free lime is reduced, so there is no need to worry about alkaline contamination of the improved ground. . In addition, since granulated slag, which is produced in large quantities as a by-product during the iron-making process, is used in place of expensive quicklime, it becomes a cheaper ground improvement material.
（発明が解決しようとする課題）
上記の転炉スラグを利用した地盤改良材のうち、特開昭
５３−８４１３１１号では、セメントの代わりに安価な
β型半水石膏を用いてはいるが、まだ生石灰を全成分の
半分程度の割合で含んでいる。また、平均粒径が０．１
〜５ＩＩＩｌ程度の転炉スラグを用いている。(Problems to be Solved by the Invention) Among the ground improvement materials using converter slag mentioned above, JP-A-53-841311 uses inexpensive β-type hemihydrate gypsum instead of cement; It still contains quicklime, which accounts for about half of its total content. In addition, the average particle size is 0.1
Converter slag of about ~5IIIl is used.
同５６−４１９１６号では、生石灰を全く用いず水砕ス
ラグを用いていることから、前例と比較してかなりの低
価格化ができると考えられるが、少量ではあるがポルト
ランドセメントを含んでいる。また、転炉スラグの粒度
は平均粒径で１００−以下に調整しているが、具体的組
成例は挙げられていない。No. 56-41916 does not use quicklime at all and uses granulated slag, so it is thought that the price can be reduced considerably compared to the previous example, but it also contains a small amount of Portland cement. Further, although the particle size of the converter slag is adjusted to an average particle size of 100 or less, no specific composition example is given.
よって、本発明の目的は、転炉スラグを利用した、価格
面および性能面において満足のいく地盤改良材を提供す
ることにある。Therefore, an object of the present invention is to provide a ground improvement material that utilizes converter slag and is satisfactory in terms of price and performance.
（課題を解決するための手段）
本発明者等は、地盤改良材として必要な性能を保ちなが
ら価格を低く抑えるために、転炉スラグを主成分とした
ときの添加材の組成および地盤改良材としての強度につ
いて種々検討した結果、転炉スラグの粒度を従来より細
かい一定の範囲に保ち、添加材として水砕スラグと石膏
とを転炉スラグに対しである割合で配合して得られた組
成物が、上記目的を満足することを見出し、本発明を完
成させた。(Means for Solving the Problems) In order to keep the price low while maintaining the necessary performance as a soil improvement material, the present inventors have developed a composition of additives and a soil improvement material when converter slag is the main component. As a result of various studies on the strength of converter slag, we found that the particle size of converter slag was kept within a certain range, finer than before, and a composition was obtained by mixing granulated slag and gypsum as additives in a certain ratio to converter slag. The inventors have discovered that a product satisfies the above objects, and have completed the present invention.
すなわち、本発明の要旨は、粒度が比表面積のプレーン
値で１０００〜５０００ｃＩＩＩｚ／ｇである転炉スラ
グ１００に対し、重量比で水砕スラグ徽粉末を１０〜４
０および石膏をｌＯ〜４０の割合で配合した地盤改良材
にある。That is, the gist of the present invention is that the granulated slag powder is added in a weight ratio of 10 to 4 to 100 converter slag whose particle size is 1000 to 5000 cIIIz/g in plain value of specific surface area.
It is a ground improvement material containing 0 and gypsum at a ratio of 10 to 40.
プレーン値とは、特にセメント工業関係で広く用いられ
ているプレーン法によって測定された比表面積の測定値
である。上記プレーン値１０００〜５０００ｃｍ２／ｇ
は粒径に換算すると、平均粒径で約１１〜１７Ｉｓ程度
に相当する。The plain value is a measured value of specific surface area measured by the plain method, which is widely used especially in the cement industry. Above plain value 1000-5000cm2/g
When converted into particle size, the average particle size corresponds to about 11 to 17 Is.
（作用） 以下、本発明について詳細に説明する。(effect) The present invention will be explained in detail below.
本発明において使用する転炉スラグは、いわゆる転炉精
練に際して副生されるスラグであれば特に制限はなく、
その１例を挙げれば下記の範囲の組成を有する。The converter slag used in the present invention is not particularly limited as long as it is slag produced as a by-product during so-called converter scouring.
One example thereof has a composition within the following range.
第１表
（注）＊：Ｔ−Ｆｅとして
転炉スラグはすでに知られているように、成分として含
まれているＦｅＯが水と接触してＦｅｘＯ＊となり、周
辺地盤に対して膠結作用を施し団粒を促進するため、地
盤改良材としての効果が大きい。Table 1 (Note) *: As converter slag is already known as T-Fe, the FeO contained as a component becomes FexO* when it comes into contact with water, which causes agglomeration to the surrounding ground. It is highly effective as a soil improvement material because it promotes agglomeration.
さらに、遊離のＣａＯを５〜１０％含んでいるため、硬
化中にわずかに膨張してクラックを防ぐ作用を有してい
る。それに加えて、本発明においては、プレーン値で１
０００〜５０００ａＪ／ｇの範囲にある比表面積を有す
る転炉スラグを使用する。Furthermore, since it contains 5 to 10% free CaO, it expands slightly during curing and has the effect of preventing cracks. In addition, in the present invention, the plane value is 1
A converter slag with a specific surface area in the range from 000 to 5000 aJ/g is used.
前述のように、特開昭５６−４１９１６号では転炉スラ
グの粒度調整を１００−以下としているが、本発明者等
による多くの実験の結果、粒度を表す特性値として比表
面積（Ｉｇの粉体が有する表面積）の値を用い、転炉ス
ラグが従来の生石灰に代用でき得る反応性を有し、かつ
、地盤改良材としての所要強度を達成するためにはプレ
ーン値１０００ａＪ／ｇ以上の比表面積を有することが
必要なことがわかった。As mentioned above, in JP-A-56-41916, the grain size of converter slag is adjusted to 100- or less, but as a result of many experiments by the present inventors, the specific surface area (Ig powder) is a characteristic value representing grain size. In order for converter slag to have reactivity that can be used as a substitute for conventional quicklime and to achieve the required strength as a ground improvement material, a plain value of 1000 aJ/g or more is required. It turns out that it is necessary to have a surface area.
プレーン値１０００ｃｍ２／ｇは平均粒径で約１１ｔＪ
Ｉに相当するため、従来の１００−以下という粒度調整
と比較して、本発明では、最大でも１７５以下の細かい
粒子のみを用いることになる。The plain value of 1000cm2/g is approximately 11tJ in average particle size.
Therefore, compared to the conventional particle size adjustment of 100 or less, in the present invention, only fine particles of 175 or less are used at most.
転炉スラグはボールミルにより粉砕され、得られた微粉
の比表面積をプレーン法により測定する。The converter slag is pulverized by a ball mill, and the specific surface area of the resulting fine powder is measured by the plain method.
プレーン値が１０００ａＪ／ｇ以上になるまで、この粉
砕および測定の作業を繰り返す。This grinding and measuring operation is repeated until the plain value becomes 1000 aJ/g or more.
転炉スラグの比表面積が大きいほどその反応性は高く、
地盤改良材としての所要強度を達成するのに有利である
が、比表面積を上げるための粉砕に時間がかかると製造
コストが高（なってしまう。The larger the specific surface area of converter slag, the higher its reactivity.
Although it is advantageous in achieving the required strength as a soil improvement material, the manufacturing cost becomes high as it takes time to crush it to increase the specific surface area.
また、地盤改良材の強度に対する転炉スラグ比表面積の
影響を調べたところ、プレーン値が５００Ｍ／ｇを超え
たあたりで、得られる地盤改良材の強度は頭打ちとなり
、それ以上転炉スラグの比表面積をあげたところで強度
の飛躍的な向上は望めないことが判明した。したがって
、地盤改良材として高性能化が実現でき、かつコストが
低いという本発明の目的を満足するために、転炉スラグ
の粒度はプレーン値１０００〜５０００ａＪ／ｇの範囲
に調整する。In addition, when the influence of the converter slag specific surface area on the strength of the soil improvement material was investigated, the strength of the obtained soil improvement material reached a ceiling when the plain value exceeded 500 M/g, and the strength of the obtained soil improvement material reached a peak when the plain value exceeded 500 M/g, It has been found that increasing the surface area does not lead to a dramatic improvement in strength. Therefore, in order to satisfy the object of the present invention that high performance can be achieved as a ground improvement material and cost is low, the particle size of converter slag is adjusted to a plain value in the range of 1000 to 5000 aJ/g.
好ましくは、２０００〜４０００ａｊ／ｇが良い。Preferably, 2000 to 4000aj/g is good.
さらに、本発明では水砕スラグ微粉末を使用するが、こ
の水砕スラグはいわゆる高炉製練に際して副生されるス
ラグ（高炉スラグ）を急冷、粉砕したスラグであれば特
に制限はないが、粒度に関しては、プレーン値３０００
〜５０００ｃｄ／ｇ程度の微粉末を用いることが好まし
い。Further, in the present invention, pulverized granulated slag is used, but there are no particular restrictions on the granulated slag as long as it is slag obtained by rapidly cooling and pulverizing slag produced by blast furnace smelting (blast furnace slag). For the plain value 3000
It is preferable to use a fine powder of about 5000 cd/g.
本発明においては、添加材として、上記の転炉スラグ１
００に対し重量比で水砕スラグ徽粉末を１０〜４０およ
び石膏をｌＯ〜４０の割合で配合する。特開昭５６−４
１９１６号では、同じく添加材として、水砕スラグおよ
び少量のポルトランドセメントを用いているが、本発明
ではこのポルトランドセメントの代わりに、非常に安価
な石膏を用いている。In the present invention, the above-mentioned converter slag 1 is used as an additive.
The granulated slag powder is blended in a weight ratio of 10 to 40, and the gypsum is blended in a weight ratio of 10 to 40. Japanese Unexamined Patent Publication No. 56-4
No. 1916 similarly uses granulated slag and a small amount of Portland cement as additives, but in the present invention, very inexpensive gypsum is used instead of this Portland cement.
本発明において使用する石膏としては、α型およびβ型
半水石膏などを用いてもよいが、排煙脱硫からの回収物
である亜硫酸カルシウムを空気酸化して得られる、排煙
脱硫石膏などを用いるとよりいっそうの低価格化が期待
できる。As the gypsum used in the present invention, α-type and β-type hemihydrate gypsum may be used, but flue gas desulfurization gypsum, etc. obtained by air oxidation of calcium sulfite, which is recovered from flue gas desulfurization, may also be used. If used, further price reduction can be expected.
また、本発明では、ポルトランドセメントの代わりに石
膏を用いるために、改良地盤のアルカリ度功（希釈され
るという利点もある。Furthermore, in the present invention, since gypsum is used instead of Portland cement, there is also the advantage that the alkalinity of the improved ground is diluted.
水砕スラグおよび石膏の転炉スラグに対する配合比は、
各種配合比に関して実験を行い、地盤改良材としたとき
の性能（強度）とこれら添加材の添加量の増大に伴う製
造コストとの兼ね合いから決定した。すなわち、転炉ス
ラグを１００としたときの水砕スラグおよび石膏の添加
量をそれぞれ重量比で１０未満とすると、地盤改良材と
して必要最低限の強度が得られないことが判明した。ま
た、これらの添加量を転炉スラグ１００に対してそれぞ
れ重量比で４０より多くしても、地盤改良材としての強
１度はさほど変わらないため、経済性を考えた場合重量
比で４０以下が適当である。より好ましくは、転炉スラ
グ１００に対して水砕スラグの添加量は重量比で３０〜
４０および石膏の添加量は１５〜４０が良い。The mixing ratio of granulated slag and gypsum to converter slag is:
Experiments were conducted on various blending ratios, and the decision was made based on the balance between the performance (strength) when used as a soil improvement material and the manufacturing cost associated with an increase in the amount of these additives added. That is, it has been found that if the weight ratio of granulated slag and gypsum added is less than 10 when the converter slag is 100, the minimum strength required as a ground improvement material cannot be obtained. In addition, even if the weight ratio of each of these additives is increased to 100% of converter slag, the strength as a soil improvement material does not change much, so when considering economic efficiency, the weight ratio should be 40 or less. is appropriate. More preferably, the amount of granulated slag added to 100 parts of converter slag is from 30 to 100 parts by weight.
40 and the amount of gypsum added is preferably 15 to 40.
本発明の組成物は、比表面積がプレーン値１０００〜５
０００ｃｄ／ｇになるようにボールミルなどを用いて転
炉スラグを粉砕した後に、３０００〜５０００ｃｍ２／
ｇ程度に粉砕された水砕スラグ微粉末と特に粒度調整を
していない石膏とを所定の割合で混合することによって
得られる。または、はじめに転炉スラグと石膏とを所定
の割合で配合し、ボールミルなどにより粉砕して得られ
た粒度がプレーン値１０００〜５０００ｃｄの混合物に
、３０００〜５０００ａＪ／ｇ程度に粉砕された水砕ス
ラグ微粉末を所定の割合で添加し、全体を混合すること
によっても得られる。The composition of the present invention has a specific surface area of 1000 to 5
After crushing the converter slag using a ball mill etc. to 000 cd/g, 3000 to 5000 cm2/g
It is obtained by mixing granulated slag fine powder, which has been ground to about 1.5 g, with gypsum, which has not been particularly adjusted in particle size, in a predetermined ratio. Alternatively, first, converter slag and gypsum are mixed in a predetermined ratio and crushed using a ball mill, etc., and the obtained mixture has a plain value of 1000 to 5000 cd, and granulated slag is crushed to about 3000 to 5000 aJ/g. It can also be obtained by adding fine powder at a predetermined ratio and mixing the whole.
以下に、実施例をあげて本発明の詳細な説明するが、本
発明の範囲は以下の実施例により制限されるものではな
い。The present invention will be described in detail below with reference to Examples, but the scope of the present invention is not limited by the Examples below.
実施例１
第２表の化学組成を有する転炉スラグおよび水砕スラグ
をそれぞれ別途にボールミルを用いて粉砕しながら、そ
の比表面積をプレーン法にて測定し、転炉スラグはプレ
ーン値４０００ａＪ／ｇに、水砕スラグはプレーン値４
０００ａＪ／ｇに調整した０石膏は排煙脱硫石膏を用い
た。Example 1 While converter slag and granulated slag having the chemical compositions shown in Table 2 were separately ground using a ball mill, their specific surface areas were measured by the plain method. The converter slag had a plain value of 4000 aJ/g. The granulated slag has a plain value of 4.
As the 0 gypsum adjusted to 000 aJ/g, flue gas desulfurization gypsum was used.
第２表 （重量％）
上記の転炉スラグ１ ｋｇに、転炉スラグ１００に対し
て重量比で５．１０．３０．４０．５０の割合に相当す
る５０．１００．３００．４００．５００ ｇの上記水
砕スラグ、および転炉スラグ１００にして重量比で５．
１５．３０．４０．５０の割合に相当する５０．１５０
．３００．４００、５００ ｇの排煙脱硫石膏を添加し
たそれぞれの組成物を地盤改良材とし、重量比で水：各
地盤改良材：砂＝１：２：３の割合で混合しモルタルと
した。得られたモルタルを直径５ｃ−×高さ１０ｃ＋ａ
モールド内で３日間湿った空気中で養生した後、２０℃
の水中で養生した。養生７日後および２８日後に各試料
をモールドから抜き出し、それぞれについて−軸圧縮試
験を行った。その結果を第１図にグラフで示す。Table 2 (% by weight) 1 kg of the above converter slag contains 50.100.300.400.500 g, which corresponds to a weight ratio of 5.10.30.40.50 to 100 converter slag. The above-mentioned granulated slag and converter slag have a weight ratio of 5.
50.150 corresponding to the ratio of 15.30.40.50
．． 300. The respective compositions to which 400 and 500 g of flue gas desulfurization gypsum were added were used as soil improvement materials, and mixed at a weight ratio of water: each soil improvement material: sand = 1:2:3 to form mortar. The obtained mortar is 5c in diameter x 10c in height + a
After curing in the mold in humid air for 3 days, the temperature is 20°C.
It was cured in water. After 7 days and 28 days of curing, each sample was taken out of the mold and subjected to an axial compression test. The results are shown graphically in FIG.
第１図より、転炉スラグに対して水砕スラグおよび石膏
の添加率が大きいと、強度が上がるのがわかる０本発明
の転炉スラグ１００に対する水砕スラグおよび石膏の配
合比の範囲である重量比で１０〜４０において、７日間
養生後の強度は４ｋｇ／−前後である。２８日間養生後
の強度は３８〜７８ｋｇ／ｃ＋Ｊとなり、地盤改良材と
して必要な強度に相当する１０ｋｇ／ｃｍ２以上になっ
ている。From FIG. 1, it can be seen that when the addition ratio of granulated slag and gypsum to the converter slag is large, the strength increases. At a weight ratio of 10 to 40, the strength after curing for 7 days is around 4 kg/-. The strength after curing for 28 days was 38 to 78 kg/c+J, which is 10 kg/cm2 or more, which corresponds to the strength required as a soil improvement material.
実施例２
第２表の化学組成を有する転炉スラグを粉砕して、比表
面積をそれぞれプレーン値５００．１０００．２０００
．３０００．４０００．５０００．６０００ｃ＋Ｊ／ｇ
とした。その転炉スラグｋ １ ｋ＋ｒを、転炉スラグ
１００に対し重量脱硫石膏１５０ｇ配合した組成物を地
盤改良材として、重量比で水：各地盤改良材：砂＝１：
２：３の割合で混合しモルタルとした。得られたモルタ
ルについて実施例１と同様の処理を行い、２８日養生後
の圧縮強度を測定した。その結果を第２図に示す。Example 2 Converter slag having the chemical composition shown in Table 2 was pulverized to give a specific surface area of 500.1000.2000, respectively.
．． 3000.4000.5000.6000c+J/g
And so. A composition in which the converter slag k 1 k+r is mixed with 150 g of weight desulfurized gypsum per 100 parts of the converter slag is used as a soil improvement material, and the weight ratio of water: each soil improvement material: sand = 1:
They were mixed at a ratio of 2:3 to form mortar. The obtained mortar was subjected to the same treatment as in Example 1, and the compressive strength after curing for 28 days was measured. The results are shown in FIG.
第２図かられかるように、プレーン値が上がれば強度は
大きくなるが、５０００ｃｄ／ｇを超えると強度のグラ
フはなだらかな１頃斜になる。フ゛レーンイ直が１００
０ｃ＋Ｊ／ｇより小さい場合、強度は８ｋｇ／−となり
、地盤改良材として必要な強度に相当する１０ ｋｇ
／ ｃｔＡ以上を満足しない、つまり、５０００ｃ＋ｌ
ｌ／ｇと１０００ｃｄ／ｇとはこの強度のグラフにおい
て変曲点となっており、１０００ｃ＋Ｊ／ｇ未満になる
と極端に強度は低下し、もはや地盤改良材として使用不
可能になる。As can be seen from Figure 2, as the plane value increases, the intensity increases, but when it exceeds 5000 cd/g, the intensity graph becomes a gentle slope around 1. Free lane directness is 100
If it is smaller than 0c+J/g, the strength will be 8 kg/-, which is 10 kg, which corresponds to the strength required as a soil improvement material.
/ does not satisfy ctA or more, that is, 5000c+l
l/g and 1000cd/g are inflection points in this strength graph, and when it becomes less than 1000c+J/g, the strength decreases extremely and it can no longer be used as a ground improvement material.
以上のことから、添加材の組成を限定するとともに、粒
度がプレーン値１０００〜５０００ｃｄ／ｇの転炉スラ
グを用いる本発明の組成は、従来の組成と比較して、地
盤改良材として必要な性能を保ちながらも非常に安価な
材料であることがわかる。From the above, the composition of the present invention, which limits the composition of additives and uses converter slag with a plain value of 1000 to 5000 cd/g, has better performance than conventional compositions as a ground improvement material. It can be seen that it is a very inexpensive material while maintaining the same properties.
（発明の効果）
使用する転炉スラグを、従来より平均粒径で１７５以下
に相当する細かい粒度に限定し、添加材として水砕スラ
グおよび石膏をある範囲の比率で配合することだけで、
地盤改良材としての所要強度を満たし、なおかつ、製造
コストの安価である本発明の地盤改良材の効果は、大量
の地盤改良材を必要とする地盤改良工事を促進させるた
めに大きな貢献を約束するものである。(Effects of the invention) By simply limiting the converter slag used to a finer particle size corresponding to an average particle size of 175 or less than before, and adding granulated slag and gypsum as additives in a certain range of ratios,
The effect of the soil improvement material of the present invention, which satisfies the required strength as a soil improvement material and is inexpensive to manufacture, promises to make a significant contribution to promoting soil improvement work that requires a large amount of soil improvement material. It is something.
第１図は、地盤改良材の組成に対する、各地盤改良材を
モルタルとしたときの７日問および２８日間養生後の強
度を示すグラフ；および
第２図は、本発明にかかる地盤改良材をモルタルとした
ときの強度について、転炉スラグの各プレーン値による
影響を示すグラフである。
第１図Fig. 1 is a graph showing the strength after curing for 7 days and 28 days when each ground improvement material is used as a mortar against the composition of the soil improvement material; and Fig. 2 shows the strength of the soil improvement material according to the present invention. It is a graph showing the influence of each plane value of converter slag on the strength when made into mortar. Figure 1
Claims (1)
＾２／ｇである転炉スラグ１００に対し、重量比で水砕
スラグ微粉末を１０〜４０および石膏を１０〜４０の割
合で配合した地盤改良材。Particle size is 1000 to 5000 cm in plain value of specific surface area.
A ground improvement material containing 100 parts by weight of granulated slag powder and 10 to 40 parts by weight of gypsum with respect to 100 parts of converter slag having a weight ratio of 2/g.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63193638A JPH0243281A (en) | 1988-08-03 | 1988-08-03 | Material for foundation conditioning |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63193638A JPH0243281A (en) | 1988-08-03 | 1988-08-03 | Material for foundation conditioning |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0243281A true JPH0243281A (en) | 1990-02-13 |
Family
ID=16311270
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63193638A Pending JPH0243281A (en) | 1988-08-03 | 1988-08-03 | Material for foundation conditioning |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0243281A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010120987A (en) * | 2008-11-17 | 2010-06-03 | Nisshin Steel Co Ltd | Solidifying agent |
| JP2012149426A (en) * | 2011-01-18 | 2012-08-09 | Nippon Steel Corp | Manufacturing method of modified soil and water area environment restoration execution method |
| JP2020500142A (en) * | 2016-10-31 | 2020-01-09 | ロエシェ ゲーエムベーハー | Method for processing and activating steel mill slag |
-
1988
- 1988-08-03 JP JP63193638A patent/JPH0243281A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010120987A (en) * | 2008-11-17 | 2010-06-03 | Nisshin Steel Co Ltd | Solidifying agent |
| JP2012149426A (en) * | 2011-01-18 | 2012-08-09 | Nippon Steel Corp | Manufacturing method of modified soil and water area environment restoration execution method |
| JP2020500142A (en) * | 2016-10-31 | 2020-01-09 | ロエシェ ゲーエムベーハー | Method for processing and activating steel mill slag |
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