JPH0158236B2 - - Google Patents
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- Publication number
- JPH0158236B2 JPH0158236B2 JP57193979A JP19397982A JPH0158236B2 JP H0158236 B2 JPH0158236 B2 JP H0158236B2 JP 57193979 A JP57193979 A JP 57193979A JP 19397982 A JP19397982 A JP 19397982A JP H0158236 B2 JPH0158236 B2 JP H0158236B2
- Authority
- JP
- Japan
- Prior art keywords
- cement
- acid
- weight
- soil stabilizer
- soil
- 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.)
- Expired
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- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Description
本発明は軟弱地盤の土質安定材組成物に関し、
詳しくは凝結遅延性を有する良好な土質安定材を
提供するものである。
従来から、軟弱地盤に土質安定材を混合して硬
化・強化する地盤改良工法は広く実施されてい
る。また近年、自然環境保全、公害防止の点から
海底、湖沼などの軟弱地盤を現位置で固定安定化
して改良する深層混合処理工法がある。かかる工
法においては、一般に撹拌翼を有する混合処理機
を軟弱地盤に挿入し、該処理機の軸先端からスラ
リー状の土質安定材を注入して混合するように工
夫して施工され、支持地盤層に密着・硬化して地
盤の改良が達成される。さらに、上記の施工を隣
接して連続的に実施することにより、順次に重複
接合して壁状、格子状、ブロツク状などの一体化
された改良地盤が得られる。
しかして、上記の如き連続的な施工により一体
化した改良地盤を形成する場合、重複部分が注入
された土質安定材と共に良好に混合された硬化を
達成するためには、一定期間の凝結遅延性を有
し、しかる後に速かな硬化強度を発現する土質安
定材が要求される。このような目的に応じた土質
安定材としては、例えば特開昭55−48282、同56
−139581によりセメント類、石灰類および酸化亜
鉛を構成々分とする凝結遅延性の土質安定剤が提
案されている。
本発明者らは上記の目的に鑑み、凝結遅延性を
有する新規な土質安定材としてセメント、石灰お
よびオキシカルボン酸またはその塩を構成々分と
する組成物を既に提案した。さらに良好な土質安
定材の開発について鋭意進めた結果、セメント、
リン酸二水素カルシウム、およびオキシカルボン
酸またはその塩よりなる組成物を用いる場合に
は、著しい凝結遅延性が発揮されると共に、しか
る後に凝結始発から凝結終結までの時間が極めて
短かく出来ること知見して、本発明を完成するに
至つたものである。即ち、本発明はセメントに対
して、リン酸二水素カルシウム0.1〜５重量％お
よびオキシカルボン酸またはその塩0.1〜10重量
％を配合して成る土質安定材組成物である。
本発明の土質安定材組成物は目的に応じて所定
量の水を添加してスラリー状に調製して、軟弱地
盤の改良に供されるが、その際に各成分の添加量
を調整することにより、例えば１日以上、特に３
日以上の長い凝結遅延期間を得ることも可能であ
り、しかも凝結の始発から終結まで時間を短かく
出来、さらに所望の硬化強度を得ることが出来
る。したがつて、本発明の土質安定材組成物は、
海底などの軟弱地盤を改良する深層混合処理工法
において、壁状などに一体化する地盤改良に有用
である。
本発明に用いるセメントとしては特に制限され
ず、一般に普通ポルトラントセメント、早強ある
いは中庸熱ポルトランドセメントなどの特殊セメ
ント、高炉セメントあるいにフライアツシユセメ
ントなどの混合セメントなどが挙げられ、それら
を単独または組合せて使用することが出来る。
本発明の土質安定材組成物においては、特にリ
ン酸二水素カルシウム（第一リン酸カルシウム）
を一構成々分として配合することが、著しい凝結
遅延性を発揮させるために極めて重要である。因
みに、本発明の土質安定材組成物において、リン
酸二水素カルシウム（第一リン酸カルシウム）の
代りにリン酸−水素カルシウム（第二リン酸カル
シウム）あるいはリン酸カルシウム（第三リン酸
カルシウムを用いた場合には、殆んど凝結遅延効
果が発揮されない。本発明の土質安定材組成物に
おいてはセメントに対してリン酸二水素カルシウ
ムを0.1〜５重量、特に0.5〜３重量％配合するこ
とが好ましい。リン酸二水素カルシウムの配合量
が上記した0.1重量％に満たない場合には、凝結
遅延効果が低下し、また５重量％を越えた場合に
はセメントスラリーの粘度が増加するため軟弱地
盤との撹拌混合が不足し、かつ凝結期間が異常に
長くなり、硬化強度が不足する。
次いで、本発明の土質安定材組成物においては
オキシカルボン酸またはその塩を他の一構成々分
として配合することも、所望の凝結遅延性を有す
る土質安定材を得るために至つて重要である。オ
キシカルボン酸としては、例えば酒石酸、クエン
酸、リンゴ酸、グルコン酸など、またそれらナト
リウム、カリウムなどのアルカリ金属塩、カルシ
ウム塩などが挙げられ、特にリンゴ酸およびグル
コン酸またはその塩が推奨される。オキシカルボ
ン酸またはそれらの塩の配合量は、セメントに対
して一般に0.1〜10重量％、好ましくは１〜６重
量％である。即ち、オキシカルボン酸の配合量が
上記の0.1重量％に満たない場合には凝結遅延効
果が十分に発揮されず、また10重量％を越えた場
合には凝結遅延期間が長くなるばかりか、硬化強
度も不足する。
本発明の土質安定材組成物に水を添加して土質
安定材スラリーを調整する方法は、特に制限され
ない。例えばセメント、リン酸二水素カルシウ
ム、およびオキシカルボン酸またはその塩を配合
した組成物に水を添加する方法、セメントに水を
添加したスラリー（ミルク）に所定量のリン酸二
水素カルシウムおよびオキシカルボン酸またはそ
の塩を添加する方法およびその抽出液を添加する
方法など、それらの添加順序は適宜に選択でき
る。なお、本発明の土質安定材組成物には、他の
凝結遅延材など必要に応じて公知のセメント添加
剤を混合することも特に制限されない。
本発明の土質安定材組成物は一般に水・土質安
定材組成物比50〜150％のスラリーに調製されて、
軟弱地盤の特に連続的な施工に供され、例えば壁
状など一体化した改良地盤を得ることが出来る。
この場合、所望の長時間の凝結遅延効果を得るこ
とが出来、しかも凝結の始開から終結の時間が短
かく出来て、十分に所定の一般に７Kg-f／cm2以上
の設計強度を速かに得ることが出来る。
以下、本発明について実施例を挙げるが、本発
明はこれらによつて何ら限定されるものではな
い。
実施例 １
広島港の海底より採取した自然含水比90％の粘
土100重量部に、普通ポルトランドセメントに対
してリン酸二水素カルシウムCa（H2PO4）2を２重
量％と第１表に示す各種オキシカルボン酸または
その塩を1.5重量％混合した土質安定材組成物
10.7重量部を水・土質安定材組成物比100％のセ
メントスラリーとして注入し、撹拌混合して処理
土の凝結時間と一軸圧縮強度を測定した。それら
の結果を第１表に示した。なお、第１表中のNo.１
は比較例に相当する。
The present invention relates to a soil stabilizer composition for soft ground,
Specifically, the purpose is to provide a good soil stabilizing material that has a setting retarding property. BACKGROUND ART Ground improvement methods have been widely used in the past to mix soil stabilizers into soft ground to harden and strengthen it. In addition, in recent years, from the viewpoint of preserving the natural environment and preventing pollution, there has been a deep mixing method that improves soft ground such as seabeds and lakes by fixing and stabilizing it in its current location. In this construction method, a mixing machine with stirring blades is generally inserted into the soft ground, and a soil stabilizer in the form of slurry is injected from the tip of the shaft of the machine and mixed. It adheres to and hardens to achieve ground improvement. Furthermore, by carrying out the above-mentioned constructions adjacently and consecutively, it is possible to obtain an integrated improved ground in the form of walls, grids, blocks, etc. by sequentially overlapping and joining. Therefore, when forming an integrated improved ground through continuous construction as described above, in order to achieve good mixing and hardening of the overlapping parts with the injected soil stabilizing material, it is necessary to retard setting for a certain period of time. There is a need for a soil stabilizing material that has the following properties and then exhibits rapid hardening strength. Examples of soil stabilizing materials suitable for such purposes include JP-A-55-48282 and JP-A-56.
-139581 proposes a setting-retarding soil stabilizer containing cement, lime, and zinc oxide as constituents. In view of the above object, the present inventors have already proposed a composition comprising cement, lime, and oxycarboxylic acid or a salt thereof as a new soil stabilizer having setting retarding properties. As a result of our efforts to develop better soil stabilizing materials, cement,
Knowledge that when using a composition consisting of calcium dihydrogen phosphate and oxycarboxylic acid or its salt, not only remarkable setting retardation properties are exhibited, but also the time from the start of setting to the end of setting can be extremely shortened. As a result, the present invention was completed. That is, the present invention is a soil stabilizer composition comprising 0.1 to 5% by weight of calcium dihydrogen phosphate and 0.1 to 10% by weight of oxycarboxylic acid or its salt, based on cement. The soil stabilizer composition of the present invention is prepared into a slurry by adding a predetermined amount of water depending on the purpose and used for improving soft ground, but at that time, the amount of each component added may be adjusted. For example, for more than 1 day, especially for 3 days.
It is possible to obtain a setting delay period as long as 1 day or more, and the time from the start to the end of setting can be shortened, and furthermore, the desired hardening strength can be obtained. Therefore, the soil stabilizer composition of the present invention has the following characteristics:
It is useful for improving the ground that is integrated into walls, etc. in the deep mixing treatment method for improving soft ground such as the seabed. The cement used in the present invention is not particularly limited, and generally includes ordinary portland cement, special cements such as early strength or medium heat portland cement, mixed cements such as blast furnace cement and fly ash cement, and these may be used alone. Or they can be used in combination. In the soil stabilizer composition of the present invention, especially calcium dihydrogen phosphate (monocalcium phosphate)
It is extremely important to blend these as one component in order to exhibit remarkable setting retardation properties. Incidentally, in the soil stabilizer composition of the present invention, when calcium hydrogen phosphate (dibasic calcium phosphate) or calcium phosphate (tertiary calcium phosphate) is used instead of calcium dihydrogen phosphate (monocalcium phosphate), almost no In the soil stabilizer composition of the present invention, calcium dihydrogen phosphate is preferably blended in an amount of 0.1 to 5% by weight, particularly 0.5 to 3% by weight, based on the cement.Calcium dihydrogen phosphate If the blending amount is less than the above 0.1% by weight, the setting retardation effect will decrease, and if it exceeds 5% by weight, the viscosity of the cement slurry will increase, resulting in insufficient stirring and mixing with the soft ground. , and the setting period becomes abnormally long, resulting in insufficient hardening strength.Next, in the soil stabilizer composition of the present invention, it is also possible to blend oxycarboxylic acid or its salt as another component to achieve the desired setting. It is extremely important for obtaining soil stabilizing materials with retarding properties. Examples of oxycarboxylic acids include tartaric acid, citric acid, malic acid, gluconic acid, and their alkali metal salts such as sodium and potassium, calcium salts, etc. Malic acid and gluconic acid or their salts are particularly recommended.The amount of oxycarboxylic acid or their salts is generally 0.1 to 10% by weight, preferably 1 to 6% by weight based on the cement. That is, if the amount of oxycarboxylic acid blended is less than the above 0.1% by weight, the setting retardation effect will not be sufficiently exhibited, and if it exceeds 10% by weight, not only will the setting delay period become longer, The curing strength is also insufficient. The method for preparing the soil stabilizer slurry by adding water to the soil stabilizer composition of the present invention is not particularly limited. For example, cement, calcium dihydrogen phosphate, and oxycarboxylic acid or its salt. A method of adding water to a composition containing cement, a method of adding a predetermined amount of calcium dihydrogen phosphate and an oxycarboxylic acid or its salt to a slurry (milk) made by adding water to cement, and a method of adding an extract thereof. The order of their addition can be selected as appropriate.The soil stabilizer composition of the present invention may be mixed with other known cement additives, such as other setting retarders, if necessary. The soil stabilizer composition of the invention is generally prepared into a slurry with a water/soil stabilizer composition ratio of 50 to 150%.
It is especially suitable for continuous construction on soft ground, and can provide improved ground that is integrated into a wall shape, for example.
In this case, the desired long-term setting retardation effect can be obtained, and the time from the start to the end of setting can be shortened, and the design strength of 7 kg -f /cm 2 or more can be achieved quickly enough. can be obtained. Examples of the present invention will be described below, but the present invention is not limited thereto. Example 1 To 100 parts by weight of clay with a natural moisture content of 90% collected from the seabed of Hiroshima Port, 2% by weight of calcium dihydrogen phosphate Ca (H 2 PO 4 ) 2 was added to ordinary Portland cement as shown in Table 1. A soil stabilizer composition containing 1.5% by weight of various oxycarboxylic acids or their salts as shown.
10.7 parts by weight was injected as a cement slurry with a water/soil stabilizer composition ratio of 100%, stirred and mixed, and the setting time and unconfined compressive strength of the treated soil were measured. The results are shown in Table 1. In addition, No. 1 in Table 1
corresponds to a comparative example.
【表】
実施例 ２
実施例１と同一の粘土100重量部に、普通ポル
トランドセメントに対して第２表に示すグルコン
酸およびグルコン酸ナトリウムとリン酸塩のそれ
ぞれ所定量を配合した土質安定材組成物10.7重量
部を、水・土質安定材組成物比100％のセメント
スラリーとして注入し、撹拌混合して処理上の凝
結時間と一軸圧縮強度を測定した。それらの結果
を第２表に示す。なお、第２表中のNo.３〜６およ
びNo.９〜12は比較例に相当する。[Table] Example 2 Soil stabilizer composition in which 100 parts by weight of the same clay as in Example 1 was mixed with predetermined amounts of gluconic acid, sodium gluconate, and phosphate shown in Table 2 relative to ordinary Portland cement. 10.7 parts by weight of the cement was injected as a cement slurry with a water/soil stabilizer composition ratio of 100%, stirred and mixed, and the treatment setting time and unconfined compressive strength were measured. The results are shown in Table 2. Note that Nos. 3 to 6 and Nos. 9 to 12 in Table 2 correspond to comparative examples.
Claims (1)
0.1〜５重量％およびオキシカルボン酸またはそ
の塩0.1〜10重量％を配合して成る土質安定材組
成物。 ２ セメントが普通、早強、中庸熱ポルトランド
セメント、高炉セメントまたはフライアツシユセ
メントである特許請求の範囲第１項記載の土質安
定材組成物 ３ オキシカルボン酸がリンゴ酸、酒石酸、クエ
ン酸またはグルコン酸である特許請求の範囲第１
項記載の土質安定材組成物。 ４ オキシカルボン酸の塩がナトリウム塩である
特許請求の範囲第１項記載の土質安定材組成物。[Claims] 1 Calcium dihydrogen phosphate for cement
A soil stabilizer composition comprising 0.1 to 5% by weight and 0.1 to 10% by weight of oxycarboxylic acid or its salt. 2. The soil stabilizer composition according to claim 1, wherein the cement is normal, early strength, moderate heat Portland cement, blast furnace cement, or fly ash cement. 3. The oxycarboxylic acid is malic acid, tartaric acid, citric acid, or gluconic acid. The first claim is
Soil stabilizing material composition described in section. 4. The soil stabilizer composition according to claim 1, wherein the oxycarboxylic acid salt is a sodium salt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57193979A JPS5984974A (en) | 1982-11-06 | 1982-11-06 | Soil stabilizer composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57193979A JPS5984974A (en) | 1982-11-06 | 1982-11-06 | Soil stabilizer composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5984974A JPS5984974A (en) | 1984-05-16 |
| JPH0158236B2 true JPH0158236B2 (en) | 1989-12-11 |
Family
ID=16316954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57193979A Granted JPS5984974A (en) | 1982-11-06 | 1982-11-06 | Soil stabilizer composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5984974A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5591259A (en) * | 1994-09-20 | 1997-01-07 | Sandoz Ltd. | Rapid setting cementitious compositions and method |
| US6076997A (en) * | 1997-12-03 | 2000-06-20 | Mbt Holding Ag | Deep mix soil stabilization method |
| US8280697B2 (en) | 2007-11-08 | 2012-10-02 | Cemex, Inc. | Concrete pavement system and method |
| JP7545653B2 (en) * | 2020-04-17 | 2024-09-05 | 住友大阪セメント株式会社 | Fluorine elution suppression type solidification material, improved soil, and manufacturing method of improved soil |
-
1982
- 1982-11-06 JP JP57193979A patent/JPS5984974A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5984974A (en) | 1984-05-16 |
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