JPH11181424A - Foundation improvement material - Google Patents

Foundation improvement material

Info

Publication number
JPH11181424A
JPH11181424A JP35082797A JP35082797A JPH11181424A JP H11181424 A JPH11181424 A JP H11181424A JP 35082797 A JP35082797 A JP 35082797A JP 35082797 A JP35082797 A JP 35082797A JP H11181424 A JPH11181424 A JP H11181424A
Authority
JP
Japan
Prior art keywords
cement
gypsum
intermediate process
powder
raw material
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
Application number
JP35082797A
Other languages
Japanese (ja)
Inventor
Masatake Arai
正剛 新井
Yukio Nakasaki
幸男 中崎
Michio Hirakawa
道生 平川
Hiroki Goto
博樹 後藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Okutama Kogyo Co Ltd
Taiheiyo Cement Corp
Original Assignee
Okutama Kogyo Co Ltd
Nihon Cement Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Okutama Kogyo Co Ltd, Nihon Cement Co Ltd filed Critical Okutama Kogyo Co Ltd
Priority to JP35082797A priority Critical patent/JPH11181424A/en
Publication of JPH11181424A publication Critical patent/JPH11181424A/en
Pending legal-status Critical Current

Links

Landscapes

  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Soil Conditioners And Soil-Stabilizing Materials (AREA)

Abstract

PROBLEM TO BE SOLVED: To obtain a foundation improvement material capable of giving an improving effect identical to conventional ones and being more economically produced than the conventional ones. SOLUTION: This foundation improvement material is composed of intermediate products in producing cement, which are separated and acquired from a suspension-type preheater of a cement calcination system and contain quick lime obtained by heating cement raw materials as a principal component. Powder of a calcium sulphate-containing substance can be added to the intermediate products. Powder of the calcium sulphate-containing substance and/or an inorganic hardening material (or an inorganic hardening agent) can also be added to the above intermediate products.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、路床等として軟弱
地盤等を改良する地盤改良材に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground improvement material for improving soft ground as a subgrade.

【0002】[0002]

【従来の技術】地盤改良材としては従来から種々のもの
が使用されているが、石灰系の地盤改良材は、生石灰
(CaO)を主成分として、石膏、スラグ等を配合した
ものであり、生石灰が地中の水分と反応して、反応によ
る水分の消費、反応熱による水分の蒸発によって含水率
を低下させ、地盤を改良するようになっている。
2. Description of the Related Art Conventionally, various types of soil improvement materials have been used. However, lime-based soil improvement materials are those obtained by blending gypsum, slag, etc., with quick lime (CaO) as a main component. Quicklime reacts with moisture in the ground to reduce the water content by consuming water by the reaction and evaporating the water by the heat of reaction, thereby improving the ground.

【0003】[0003]

【発明が解決しようとする課題】上述の石灰系地盤改良
材では生石灰の脱水作用と石灰による、高アルカリ雰囲
気中で添加されている石膏、スラグ等と土から溶出す
る、アルミナ、シリカの反応により強度発現が得られる
もので、強度発現が比較的遅いなどの問題があった。
The above-mentioned lime-based soil improvement material uses the dehydrating action of quick lime and the reaction of alumina and silica, which are eluted from the gypsum and slag added in a highly alkaline atmosphere with lime due to lime. The strength can be obtained, and the strength is relatively slow.

【0004】本発明は、このような従来の問題に鑑み、
従来の生石灰に代わるものを主成分とし、従来と同等の
効果が得られ、かつ、経済的に地盤改良材の提供を行う
ことを目的としたものである。
The present invention has been made in view of such a conventional problem,
An object of the present invention is to provide a ground improvement material that has the same effect as the conventional one and that is economical, with a main component being a substitute for the conventional quick lime.

【0005】[0005]

【課題を解決するための手段】上述のごとき従来の問題
を解決し、所期の目的を達成するための本発明の特徴
は、セメント焼成系のサスペンションプレヒーターから
分取され、セメント原料を加熱して得られる生石灰を主
成分とするセメント中間工程品を主成分とする地盤改良
材にあり(請求項1)、さらにこのセメント中間工程品
に天然石膏、排煙脱硫石膏、燐酸石膏、フッ酸石膏、廃
石膏ボード等の硫酸カルシウム含有物質のいずれか一種
以上の粉末を配合してなる地盤改良材にあり(請求項
2)、さらにまたこのセメント中間工程品に上記硫酸カ
ルシウム含有物質をいずれか一種以上及び/または生石
灰、スラグ粉末、ポルトランドセメント、高炉セメン
ト、フライアッシュセメント等の無機系硬化材のいずれ
か一種以上を配合してなる地盤改良材(請求項3)にあ
る。
SUMMARY OF THE INVENTION In order to solve the conventional problems as described above and to achieve the intended object, a feature of the present invention is to separate a cement raw material from a suspension preheater of a cement firing system and heat a cement raw material. A ground improvement material mainly composed of a cement intermediate process product mainly composed of quick lime obtained by the method (Claim 1), and the cement intermediate process product further includes natural gypsum, flue gas desulfurization gypsum, phosphate gypsum, hydrofluoric acid A ground improvement material comprising one or more powders of calcium sulfate-containing substances such as gypsum and waste gypsum board (Claim 2). Do not mix one or more and / or one or more of inorganic hardening materials such as quicklime, slag powder, Portland cement, blast furnace cement, fly ash cement, etc. In soil improvement material (claim 3).

【0006】セメント中間工程品に、硫酸カルシウム含
有物質の粉末および/または無機系硬化材を配合する場
合、セメント中間工程品100重量部に対し、硫酸カル
シウム含有物質の粉末および無機系硬化材が、それぞれ
0〜300重量部であることが望ましく、さらにセメン
ト中間工程品は、セメント原料を850〜900゜Cの
温度で加熱して得られる粒度5mm以下の生石灰を含む
粉末であることが好ましい。
[0006] In the case where the powder of the calcium sulfate-containing substance and / or the inorganic hardening material is mixed with the cement intermediate process product, the powder of the calcium sulfate-containing material and the inorganic hardening material are added to 100 parts by weight of the cement intermediate process product. Each of the cement intermediate process products is desirably 0 to 300 parts by weight, and the cement intermediate process product is preferably a powder containing quicklime having a particle size of 5 mm or less obtained by heating a cement raw material at a temperature of 850 to 900 ° C.

【0007】[0007]

【発明の実施の形態】本発明に係わる地盤改良材に用い
られるセメント中間工程品は、図1に示すセメント焼成
系のサスペンションプレヒーターから分取されたもので
ある。セメント焼成系のサスペンションプレヒーター
は、複数段(図1は4段の例を示す)のサイクロン5、
6、7、8と仮焼炉9をもって構成されており、ロータ
リーキルン10の排ガスが、仮焼炉9、サイクロン8、
7、6、5へ順に供給されるようになっている。この場
合、仮焼炉9は必ずしも備えなくてもよい。サスペンシ
ョンプレヒーターの最下段のサイクロン8の下部出口に
は、セメント中間工程品を分取するための分取ダンパー
20が設けられている。
BEST MODE FOR CARRYING OUT THE INVENTION A cement intermediate process product used for a ground improvement material according to the present invention is obtained by fractionating from a cement firing suspension preheater shown in FIG. The suspension preheater of the cement firing system has a plurality of stages (FIG. 1 shows an example of four stages) of cyclones 5,
6, 7 and 8 and a calciner 9. The exhaust gas from the rotary kiln 10 is supplied to the calciner 9, the cyclone 8,
7, 6, and 5 are supplied in order. In this case, the calciner 9 need not always be provided. At the lower outlet of the cyclone 8 at the lowermost stage of the suspension preheater, a sorting damper 20 for sorting the cement intermediate process product is provided.

【0008】石灰石、粘土、珪石、鉄原料等からなるセ
メント原料Lが、原料貯蔵場1から原料乾燥機2、原料
粉砕機3、原料タンク4を介して、サスペンションプレ
ヒーターの最上段のサイクロン5に供給され、サイクロ
ン6、7、8へと順に移動し、最下段のサイクロン8に
達するまでに850〜900゜Cに加熱され、セメント
中間工程品Qとなる。このセメント中間工程品Qは、サ
スペンションプレヒーターの最下段のサイクロン8から
ロータリーキルン10へ供給され、焼成されてセメント
クリンカとなるが、セメント中間工程品Qの一部が地盤
改良材の原料として、分取ダンパー20から抽出され
る。なお、地盤改良材の原料として抽出されるセメント
中間工程品は、850〜900゜Cの温度で加熱されて
いれば、最下段のサイクロン8以外の場所から抽出して
もよい。このセメント中間工程品は、粒度5mm以下の
生石灰を含む粉末であり、その成分の一例を示すと SiO2 19.0%、 Al2 3 4.3%、 F
2 3 2.7%、CaO 60.5%、 MgO
1.5% である。
[0008] A cement raw material L composed of limestone, clay, silica stone, iron raw material and the like is supplied from a raw material storage site 1 through a raw material dryer 2, a raw material crusher 3, and a raw material tank 4 to a cyclone 5 at the uppermost stage of a suspension preheater. , And sequentially moves to cyclones 6, 7, and 8, and is heated to 850 to 900 ° C. until reaching the lowermost cyclone 8, to be a cement intermediate process product Q. This cement intermediate process product Q is supplied from the cyclone 8 at the lowermost stage of the suspension preheater to the rotary kiln 10 and is baked to become a cement clinker. A part of the cement intermediate process product Q is used as a raw material for the ground improvement material. It is extracted from the take damper 20. In addition, the cement intermediate process product extracted as a raw material of the ground improvement material may be extracted from a place other than the cyclone 8 at the lowest stage as long as it is heated at a temperature of 850 to 900 ° C. This cement intermediate process product is a powder containing quicklime having a particle size of 5 mm or less, and as an example of the components, 19.0% of SiO 2 , 4.3% of Al 2 O 3 , and F
e 2 O 3 2.7%, CaO 60.5%, MgO
1.5%.

【0009】セメント中間工程品中の生石灰成分の反応
によって、地中の水分が反応に消費されると共に反応熱
により蒸発されて、脱水効果を発揮する。そして、セメ
ント中間工程品中のシリカ、アルミナ成分が、生石灰の
反応による高アルカリ雰囲気と、反応熱により活性化さ
れることによって溶解して、 珪酸カルシウム水和物(CaO−SiO2 −H2 O) アルミン酸カルシウム水和物(CaO−Al2 3 −H
2 O) 珪酸カルシウムアルミネート水和物(CaO−Al2
3 −SiO2 −H2 O) を生成して強度発現する。
[0009] By the reaction of the quicklime component in the cement intermediate process product, water in the ground is consumed in the reaction and is evaporated by the heat of reaction, thereby exhibiting a dewatering effect. Then, the silica and alumina components in the cement intermediate process product are dissolved by being activated by the reaction heat of the highly alkaline atmosphere and the reaction of quick lime, and calcium silicate hydrate (CaO—SiO 2 —H 2 O) is dissolved. ) calcium aluminate hydrate (CaO-Al 2 O 3 -H
2 O) Calcium silicate aluminate hydrate (CaO-Al 2 O)
3- SiO 2 —H 2 O) to produce strength.

【0010】[0010]

【実施例】以下のような配合の実施例1〜4、比較例1
〜3について、CBR値(Cali-fornia Bearing Rati
o)を測定した。 実施例1:セメント中間工程品 100 排煙脱硫石膏 25 (重量部) 実施例2:セメント中間工程品 100 石膏 33.3 セメント 33.3(重量部) 実施例3:セメント中間工程品 100 生石灰 233 (重量部) 実施例4:セメント中間工程品 100 生石灰 100 (重量部) 比較例1:生石灰 100 排煙脱硫石膏 25 (重量部) 比較例2:生石灰 100 石膏 33.3 セメント 33.3(重量部) 比較例3:生石灰 100 (重量部) 図2、図4に示されるように、含水率が比較的高い地盤
に対しては実施例1、2は比較例1、2をやや下回る
が、概略同等の効果を発揮した。また、実施例3、4は
比較例3と同等の効果を発揮した。
EXAMPLES Examples 1 to 4 and Comparative Example 1 having the following composition:
CBR value (Cali-fornia Bearing Rati
o) was measured. Example 1: Cement intermediate process product 100 flue gas desulfurization gypsum 25 (parts by weight) Example 2: Cement intermediate process product 100 gypsum 33.3 Cement 33.3 (parts by weight) Example 3: Cement intermediate process product 100 quicklime 233 (parts by weight) Example 4: Cement intermediate process product 100 Quicklime 100 (parts by weight) Comparative Example 1: Quicklime 100 flue gas desulfurization gypsum 25 (parts by weight) Comparative Example 2: Quicklime 100 gypsum 33.3 Cement 33.3 (parts by weight) Comparative Example 3: Quicklime 100 (Parts by weight) As shown in FIGS. 2 and 4, Examples 1 and 2 exhibited comparatively the same effect on the ground having a relatively high water content, though slightly lower than Comparative Examples 1 and 2. Examples 3 and 4 exhibited the same effects as Comparative Example 3.

【0011】また、図3、図5に示されるように含水率
が比較的低い地盤に対しては実施例1、2は比較例1、
2をやや上回る改良効果を発揮した。また、実施例3、
4は比較例3と同等の効果を発揮した。
In addition, as shown in FIGS. 3 and 5, for the ground having a relatively low water content, Examples 1 and 2 are Comparative Examples 1 and 2.
The improvement effect slightly exceeded 2. Example 3
No. 4 exhibited the same effect as Comparative Example 3.

【0012】[0012]

【発明の効果】本発明の地盤改良材によれば、セメント
中間工程品を原料とするため、従来の生石灰を原料とす
る地盤改良材に比べ、経済的に、かつ、同等の改良効果
が得られる。
According to the soil improving material of the present invention, since the cement intermediate process product is used as a raw material, compared with the conventional soil improving material using quick lime as a raw material, the same improvement effect can be obtained economically. Can be

【図面の簡単な説明】[Brief description of the drawings]

【図1】 本発明に係る地盤改良材を構成するセメント
中間工程品を製造する工程の概略を示す図である。
FIG. 1 is a view schematically showing a process of manufacturing a cement intermediate process product constituting a ground improvement material according to the present invention.

【図2】 本発明に係る地盤改良材の実施例の、含水率
の比較的高い地盤に対する改良効果を示す図である。
FIG. 2 is a diagram showing the effect of improving the ground having a relatively high water content in the embodiment of the ground improving material according to the present invention.

【図3】 本発明に係る地盤改良材の実施例の、含水率
の比較的低い地盤に対する改良効果を示す図である。
FIG. 3 is a view showing the effect of an embodiment of the ground improvement material according to the present invention on a ground having a relatively low water content.

【図4】 本発明に係る地盤改良材の実施例の、含水率
の比較的高い地盤に対する改良効果を示す図である。
FIG. 4 is a view showing an effect of improving the ground having a relatively high water content in the embodiment of the ground improving material according to the present invention.

【図5】 本発明に係る地盤改良材の実施例の、含水率
の比較的低い地盤に対する改良効果を示す図である。
FIG. 5 is a diagram showing the effect of the embodiment of the soil improvement material according to the present invention on the ground having a relatively low water content.

【符号の説明】[Explanation of symbols]

1 原料貯蔵場 2 原料乾燥機 3 原料粉砕機 4 原料タンク 5、6、7、8 サイクロン(サスペンションプレヒー
ター) 9 仮焼炉 10 ロータリーキルン 20 分取ダンパ
DESCRIPTION OF SYMBOLS 1 Raw material storage place 2 Raw material dryer 3 Raw material crusher 4 Raw material tank 5, 6, 7, 8 Cyclone (suspension preheater) 9 Calcination furnace 10 Rotary kiln 20 Preparative damper

───────────────────────────────────────────────────── フロントページの続き (72)発明者 平川 道生 東京都渋谷区千駄ケ谷5丁目32番7号 奥 多摩工業株式会社内 (72)発明者 後藤 博樹 東京都渋谷区千駄ケ谷5丁目32番7号 奥 多摩工業株式会社内 ──────────────────────────────────────────────────続 き Continued on the front page (72) Michio Hirakawa 5-32-7 Sendagaya, Shibuya-ku, Tokyo Oku Inside Tama Industry Co., Ltd. (72) Hiroki Goto 5-32-7 Sendagaya, Shibuya-ku, Tokyo Oku Tama Industry Co., Ltd.

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】セメント焼成系のサスペンションプレヒー
ターから分取され、セメント原料を加熱して得られる生
石灰を主成分とするセメント中間工程品を主成分とする
地盤改良材。
1. A soil improvement material mainly composed of quick lime and a cement intermediate process product obtained by heating a cement raw material, which is fractionated from a cement firing suspension preheater.
【請求項2】セメント焼成系のサスペンションプレヒー
ターから分取され、セメント原料を加熱して得られる生
石灰を主成分とするセメント中間工程品に天然石膏、排
煙脱硫石膏、燐酸石膏、フッ酸石膏、廃石膏ボード等の
硫酸カルシウム含有物質のいずれか一種以上の粉末を配
合してなる地盤改良材。
2. A cement intermediate process mainly containing quicklime obtained by heating a cement raw material, which is separated from a cement firing suspension preheater, includes natural gypsum, flue gas desulfurization gypsum, phosphate gypsum, and hydrofluoric gypsum. A ground improvement material comprising a powder of any one or more of calcium sulfate-containing substances such as waste gypsum board.
【請求項3】セメント焼成系のサスペンションプレヒー
ターから分取され、セメント原料を加熱して得られる生
石灰を主成分とするセメント中間工程品に、天然石膏、
排煙脱硫石膏、燐酸石膏、フッ酸石膏、廃石膏ボード等
の硫酸カルシウム含有物質のいずれか一種以上の粉末、
および/または、生石灰、スラグ粉末、ポルトランドセ
メント、高炉セメント、フライアッシュセメント等の無
機系硬化材のいずれか一種以上を配合してなる地盤改良
材。
3. A cement intermediate process product mainly composed of quick lime obtained by heating a cement raw material, which is separated from a cement firing suspension preheater, is provided with natural gypsum,
Flue gas desulfurization gypsum, phosphate gypsum, hydrofluoric gypsum, powder of any one or more of calcium sulfate-containing substances such as waste gypsum board,
And / or a ground improvement material containing at least one of inorganic hardening materials such as quicklime, slag powder, Portland cement, blast furnace cement, fly ash cement and the like.
【請求項4】セメント中間工程品100重量部に対し、
硫酸カルシウム含有物質の粉末および無機系硬化材を、
それぞれ0〜300重量部配合してなる請求項2または
請求項3に記載の地盤改良材。
4. An amount of 100 parts by weight of the cement intermediate process product
Powder of calcium sulfate-containing substance and inorganic hardener,
The ground improvement material according to claim 2, wherein each of the ground improvement materials comprises 0 to 300 parts by weight.
【請求項5】セメント中間工程品は、セメント焼成系の
サスペンションプレヒーターから分取される、セメント
原料を850〜900゜Cに加熱して得られる粒度5m
m以下の生石灰を含む粉末である請求項1〜4のいずれ
か1項に記載の地盤改良材。
5. The cement intermediate process product has a particle size of 5 m obtained by heating a cement raw material to 850 to 900 ° C., which is separated from a suspension preheater of a cement firing system.
The ground improvement material according to any one of claims 1 to 4, which is a powder containing quicklime of m or less.
JP35082797A 1997-12-19 1997-12-19 Foundation improvement material Pending JPH11181424A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP35082797A JPH11181424A (en) 1997-12-19 1997-12-19 Foundation improvement material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP35082797A JPH11181424A (en) 1997-12-19 1997-12-19 Foundation improvement material

Publications (1)

Publication Number Publication Date
JPH11181424A true JPH11181424A (en) 1999-07-06

Family

ID=18413160

Family Applications (1)

Application Number Title Priority Date Filing Date
JP35082797A Pending JPH11181424A (en) 1997-12-19 1997-12-19 Foundation improvement material

Country Status (1)

Country Link
JP (1) JPH11181424A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005126536A (en) * 2003-10-22 2005-05-19 Mitsubishi Materials Corp Soil improving material
JP2008267016A (en) * 2007-04-20 2008-11-06 Hikari Kensetsu:Kk Soil improving method
JP2011195410A (en) * 2010-03-23 2011-10-06 Fukui Prefecture Environmentally acceptable solidifying material

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005126536A (en) * 2003-10-22 2005-05-19 Mitsubishi Materials Corp Soil improving material
JP4514187B2 (en) * 2003-10-22 2010-07-28 三菱マテリアル株式会社 Solidification method of volcanic ash clay
JP2008267016A (en) * 2007-04-20 2008-11-06 Hikari Kensetsu:Kk Soil improving method
JP2011195410A (en) * 2010-03-23 2011-10-06 Fukui Prefecture Environmentally acceptable solidifying material

Similar Documents

Publication Publication Date Title
Locher Cement: principles of production and use
US5356472A (en) Portland cement clinker and portland cement
US4600438A (en) Co-production of cementitious products
CA1062735A (en) Hydraulic cements
US4508573A (en) Co-production of cementitious products
US4971627A (en) Method for producing and using a cement-type binding material
JP3038679B2 (en) Porcelain tile
US5851282A (en) Portland cement clinker and use thereof
EP0748302A1 (en) Method and plant for manufacturing mineralized portland cement clinker
JPS6336840B2 (en)
JPH11181424A (en) Foundation improvement material
Seco et al. Assessment of the ability of MGO based binary binders for the substitution of Portland cement for mortars manufacturing
JP2630665B2 (en) How to use slag and coal ash
US4220475A (en) Raw mix for producing Portland cement clinker
Chatterjee Burnability and clinkerization of cement raw mixes
CN1039638C (en) Portland cement containing sulphur-slag and its production
KR100473642B1 (en) a Method for Manufacturing Aluminate Clinker and Cement using a By-Product Steel and By-Plaster
JP4514187B2 (en) Solidification method of volcanic ash clay
WO2024219334A1 (en) Manufacturing method of portland cement clinker
SU1168530A1 (en) Method of preparing raw mixture for producing cement
JPH0313182B2 (en)
JP4315565B2 (en) Cement admixture and cement composition
JPH07206492A (en) Cement admixture and cement composition
KR20010110965A (en) decarbonized compound obtained at a cement manufacturing process and its manufacturing method
SU639827A1 (en) Raw mix for obtaining portland clinker

Legal Events

Date Code Title Description
A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20040430

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20040622

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20040823

A02 Decision of refusal

Effective date: 20060516

Free format text: JAPANESE INTERMEDIATE CODE: A02