JPH09263758A - Neutral solidifying agent - Google Patents
Neutral solidifying agentInfo
- Publication number
- JPH09263758A JPH09263758A JP7770596A JP7770596A JPH09263758A JP H09263758 A JPH09263758 A JP H09263758A JP 7770596 A JP7770596 A JP 7770596A JP 7770596 A JP7770596 A JP 7770596A JP H09263758 A JPH09263758 A JP H09263758A
- Authority
- JP
- Japan
- Prior art keywords
- soil
- weight
- blast furnace
- solidifying material
- hemihydrate gypsum
- 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.)
- Withdrawn
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、土壌改良等に用い
る固化材に関するもので、排土等を埋立処理する場合
に、埋立のためのｐＨ基準値に適応させることができる
中性固化材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solidifying material used for soil improvement and the like, and relates to a neutral solidifying material which can be adjusted to a pH standard value for landfill when landfilling waste soil or the like. .
【０００２】[0002]
【従来の技術】例えば含水率の高い建設排土等を埋立処
理する場合には、これを排土を固化させて埋立処理する
必要がある。ところで、埋立処理のために許容される排
土はｐＨを５．８〜８．６としなければならない。従来
の土壌改良材などの土を固化させる固化材はｐＨが高い
ので、このような埋立処理する場合に使用することがで
きない。例えば、普通ポルトランドセメントに無水石膏
等を加え土壌改良用固化材が知られているが、このよう
な固化材はｐＨが１０．５〜１１．５程度であり、例え
ば、排土１００重量部に固化材７重量部程度を加える通
常の土壌の固化処理では、埋立てに適当とされているｐ
Ｈ基準値の上限を上回り、適切ではない。上記ｐＨ基準
値５．８〜８．６は、水道法第４条の水質基準許容値に
準ずる値である。2. Description of the Related Art For example, when landfilling construction waste having a high water content, it is necessary to solidify the wastewater for landfilling. By the way, the pH of the soil that is allowed for landfill treatment must be 5.8 to 8.6. A conventional solidifying material for solidifying soil, such as a soil improving material, has a high pH, and therefore cannot be used for such landfill treatment. For example, a solidifying material for soil improvement by adding anhydrous gypsum or the like to ordinary Portland cement is known, and such a solidifying material has a pH of about 10.5 to 11.5. In the normal soil solidification process, in which about 7 parts by weight of solidifying material is added, it is considered suitable for landfill.
It exceeds the upper limit of the H standard value and is not appropriate. The pH standard value of 5.8 to 8.6 is a value according to the water quality standard allowable value of Article 4 of the Water Supply Act.
【０００３】[0003]
【発明が解決しようとする課題】本発明は上記実情に鑑
み開発されたもので、埋立処理すべき排土に、必要な固
化性能を付与すると共に必要な埋立土のｐＨ基準値を充
足することができる中性固化材を提供することを目的と
するものである。必要な固化性能としては、固化材を排
土等に混合後の１軸圧縮強度が建設重機の接地圧を考え
て、材令３時間で、０．４ｋｇ／ｃｍ2 を越え、材令７
日で、１．０ｋｇ／ｃｍ2 を越える値を確保するものと
する。SUMMARY OF THE INVENTION The present invention has been developed in view of the above circumstances, and it is necessary to provide necessary solidification performance to the discharged soil to be landfilled and to satisfy the required pH standard value of the landfill. The purpose of the present invention is to provide a neutral solidifying material. As for the required solidification performance, the uniaxial compressive strength after mixing the solidified material with the soil etc. exceeds 0.4 kg / cm 2 after 3 hours in consideration of the ground pressure of the construction heavy equipment.
A value exceeding 1.0 kg / cm 2 shall be secured per day.
【０００４】[0004]
【課題を解決するための手段】本発明は、上記問題点を
解決するためになされたもので、半水石膏７０〜９０重
量％と高炉スラグ１０〜３０重量％とからなることを特
徴とする中性固化材を提供するものである。本発明で
は、水硬性は大きいがｐＨの高いセメント系の材料を用
いることが適当でない。そこで、ｐＨが低く、ある程度
の初期強度を確保し、また、長期的に十分な水硬性を有
する中性固化材を開発したものである。The present invention has been made to solve the above problems, and is characterized by comprising hemihydrate gypsum 70 to 90% by weight and blast furnace slag 10 to 30% by weight. A neutral solidifying material is provided. In the present invention, it is not appropriate to use a cement-based material having a high hydraulic property but a high pH. Therefore, the present invention is to develop a neutral solidifying material having a low pH, ensuring a certain initial strength, and having sufficient hydraulic property in the long term.
【０００５】半水石膏はｐＨが約７．０であり、混合土
に初期強度を与えるもので、排土に混合後３時間で０．
４ｋｇ／ｃｍ2 程度の強度を付与する。本発明に用いる
半水石膏としては、純度７０％程度の副産石膏を用いる
ことができる。高炉スラグは、製鉄所の高炉から流出す
るスラグを水砕したものであって、ｐＨは９．０〜１
０．０程度である。高炉スラグは潜在水硬性を有し、水
和反応により長時間経過後に排土を固化させ安定した地
盤を形成するものである。Hemihydrate gypsum has a pH of about 7.0 and imparts an initial strength to the mixed soil.
It gives strength of about 4 kg / cm 2 . As the hemihydrate gypsum used in the present invention, by-product gypsum having a purity of about 70% can be used. Blast furnace slag is water granulated slag flowing out of a blast furnace of an iron mill, and has a pH of 9.0 to 1
It is about 0.0. Blast-furnace slag has latent hydraulic properties, and solidifies the discharged soil after a long time due to the hydration reaction to form a stable ground.
【０００６】半水石膏と高炉スラグとの混合割合は重量
比で（７０〜９０）：（３０〜１０）とする。半水石膏
が７０重量％未満では、高炉スラグの混合量が多くな
り、適正なｐＨを得ることが困難になるので制限され
る。一方半水石膏が９０重量％を越えると、高炉スラグ
の混合量が少なくなり、長期強度が不足するので９０重
量％以下に限定した。従って半水石膏を７０〜９０重量
％、高炉スラグを３０〜１０重量％とした。The mixing ratio of hemihydrate gypsum and blast furnace slag is (70 to 90) :( 30 to 10) by weight. If the amount of hemihydrate gypsum is less than 70% by weight, the amount of blast furnace slag to be mixed increases and it becomes difficult to obtain an appropriate pH, so that it is limited. On the other hand, if the amount of hemihydrate gypsum exceeds 90% by weight, the amount of blast furnace slag mixed will be small and the long-term strength will be insufficient, so it was limited to 90% by weight or less. Therefore, hemihydrate gypsum was 70 to 90% by weight, and blast furnace slag was 30 to 10% by weight.
【０００７】[0007]
【発明の実施の形態】本発明の中性固化材は、必要な初
期強度を確保し、長期的に十分な水硬性を有し、ｐＨの
低い中性固化材である。必要な強度としては、排土等の
初期の建設重機等によるトラフカビリティの確保及び埋
立後の長期強度を考慮して、排土の１軸圧縮強度が、材
令３時間で、０．４ｋｇ／ｃｍ2 を越え、材令７日で、
１．０ｋｇ／ｃｍ2 を越える値を基準とした。また確保
すべきｐＨ値としては、５．８〜８．６を基準とした。BEST MODE FOR CARRYING OUT THE INVENTION The neutral solidifying material of the present invention is a neutral solidifying material having a required initial strength, a sufficient hydraulic property for a long term, and a low pH. As for the required strength, the uniaxial compressive strength of the soil discharge is 0.4 kg after 3 hours, considering the troughability of the early construction heavy equipment such as soil discharge and the long-term strength after landfill. / Cm 2 over 7 days
A value exceeding 1.0 kg / cm 2 was used as a standard. The pH value to be ensured was 5.8 to 8.6.
【０００８】このような中性固化材は、半水石膏７０〜
９０重量％と高炉スラグ３０〜１０重量％を混合したも
のである。半水石膏としては、純度７０％程度の粉状副
産半水石膏を用いることができる。無水石膏はｐＨが高
く、１０．５〜１１．５であり使用することができな
い。本発明の中性固化材は、半水石膏の粉末と、ブレー
ン値（比表面積）４０００±３００ｃｍ2 ／ｇに微粉砕
した高炉スラグとを、混合器等を用いて均一に混合する
ことによって製造することができる。この中性固化材
は、対象とする排土等を混練しながら均一に所要量を添
加することによって使用することができる。この中性固
化材は、混入後、排土等の含有水分と反応して初期強度
を発生し、また長期強度を発現する。必要に応じて、排
土等の混練中に必要な水分を添加するとよい。このよう
な排土は、ｐＨが埋立処理に適する８．６以下の値を確
保し、埋立段階でハンドリングに適切な性状を有し、埋
立て後長期的には適正な強度を有する地盤を形成する。Such a neutral solidifying material is a hemihydrate gypsum 70-
90% by weight and 30 to 10% by weight of blast furnace slag are mixed. As the hemihydrate gypsum, powdery by-product hemihydrate gypsum having a purity of about 70% can be used. Anhydrous gypsum cannot be used because it has a high pH of 10.5-11.5. The neutral solidifying material of the present invention is produced by uniformly mixing hemihydrate gypsum powder and blast furnace slag finely ground to a Blaine value (specific surface area) of 4000 ± 300 cm 2 / g using a mixer or the like. can do. This neutral solidifying material can be used by uniformly adding a required amount while kneading the target soil and the like. After being mixed, the neutral solidifying material reacts with the water content of soil and the like to generate an initial strength and develop a long-term strength. If necessary, it is advisable to add necessary water during kneading such as soil removal. Such soil discharge has a pH value of 8.6 or less, which is suitable for landfill treatment, has suitable properties for handling at the landfill stage, and forms a ground with appropriate strength in the long term after landfill. To do.
【０００９】なお、以上の説明では、使用対象物として
埋立てする排土を主体に説明してきたが、本発明の中性
固化材はこれに限定されるものではなく、軟弱地盤の改
良、植生土の造成、転用、建設残土産業廃棄物としての
取り扱い、その他の対象物に適用することができるもの
である。In the above description, the soil to be landfilled as the object to be used has been mainly described, but the neutral solidifying material of the present invention is not limited to this, and improvement of soft ground and vegetation are possible. It can be applied to soil creation, diversion, handling as construction waste industrial waste, and other objects.
【００１０】[0010]
【実施例】湿潤密度が１．４４６ｇ／ｃｍ3 、含水比が
１０４．６％粒度が細粒分１００％、ｐＨが７．４の試
料土を用い、中性固化材を添加し、一軸圧縮強度及びｐ
Ｈを測定し表１に示した。表１から、半水石膏７０〜９
０重量％、高炉スラグ３０〜１０重量％の範囲内で練込
時のｐＨは８．０〜８．６であり、一軸圧縮強度は材令
３時間で０．４〜０．７ｋｇ／ｃｍ2 、材令１日で０．
４〜０．８ｋｇ／ｃｍ2 、材令７日で１．０〜１．４ｋ
ｇ／ｃｍ2 であった。EXAMPLE A sample soil having a wet density of 1.446 g / cm 3 , a water content of 104.6%, a fine particle size of 100% and a pH of 7.4 was used, a neutral solidifying material was added, and uniaxial compression was performed. Strength and p
H was measured and shown in Table 1. From Table 1, hemihydrate gypsum 70-9
Within the range of 0 wt% and blast furnace slag 30 to 10 wt%, the pH during kneading is 8.0 to 8.6, and the uniaxial compressive strength is 0.4 to 0.7 kg / cm 2 after 3 hours of age. , 1 day in order.
4 to 0.8 kg / cm 2 , 1.0 to 1.4 k in 7 days
g / cm 2 .
【００１１】これに対し、半水石膏９５重量％、高炉ス
ラグ５重量％では一軸圧縮強度の長期値が不足し、また
半水石膏６５重量％、高炉スラグ３５重量％では練込時
のｐＨが８．７となり埋立基準ｐＨに合格しなかった。
また一軸圧縮強度が材令３時間で０．３ｋｇ／ｃｍ2 と
なり不足であった。On the other hand, hemihydrate gypsum 95% by weight and blast furnace slag 5% by weight lack the long-term value of uniaxial compressive strength, and hemihydrate gypsum 65% by weight and blast furnace slag 35% by weight have a pH during kneading. It became 8.7 and did not pass the landfill standard pH.
Further, the uniaxial compressive strength was 0.3 kg / cm 2 after 3 hours and was insufficient.
【００１２】[0012]
【表１】 [Table 1]
【００１３】[0013]
【発明の効果】本発明によれば、埋立処理すべき排土等
に、１軸圧縮強度が、材令３時間で、０．４ｋｇ／ｃｍ
2 を越え、材令７日で、１．０ｋｇ／ｃｍ2 を越えるよ
うな優れた固化性能を付与することができると共に、必
要な埋立土のｐＨ基準値を満足することができる。EFFECTS OF THE INVENTION According to the present invention, the uniaxial compressive strength of the soil to be landfilled is 0.4 kg / cm in 3 hours.
2 traversal, in wood age 7 days, it is possible to impart excellent solidification properties such as exceeding 1.0 kg / cm 2, it is possible to satisfy the pH reference value of the required landfill soil.
Claims (1)
１０〜３０重量％とからなることを特徴とする中性固化
材。1. A neutral solidifying material comprising 70 to 90% by weight of hemihydrate gypsum and 10 to 30% by weight of blast furnace slag.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7770596A JPH09263758A (en) | 1996-03-29 | 1996-03-29 | Neutral solidifying agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7770596A JPH09263758A (en) | 1996-03-29 | 1996-03-29 | Neutral solidifying agent |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09263758A true JPH09263758A (en) | 1997-10-07 |
Family
ID=13641323
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7770596A Withdrawn JPH09263758A (en) | 1996-03-29 | 1996-03-29 | Neutral solidifying agent |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09263758A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100423410B1 (en) * | 2001-06-20 | 2004-03-18 | 재단법인 포항산업과학연구원 | Stabilization material of sewage sludge |
| JP2014012930A (en) * | 2012-07-03 | 2014-01-23 | Nippon Steel & Sumitomo Metal | Estimation method of modified soil strength and manufacturing method of modified soil using the same |
| JP7193105B1 (en) * | 2022-10-03 | 2022-12-20 | 強化土エンジニヤリング株式会社 | Ground injection method using ground injection material and ground injection material |
-
1996
- 1996-03-29 JP JP7770596A patent/JPH09263758A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100423410B1 (en) * | 2001-06-20 | 2004-03-18 | 재단법인 포항산업과학연구원 | Stabilization material of sewage sludge |
| JP2014012930A (en) * | 2012-07-03 | 2014-01-23 | Nippon Steel & Sumitomo Metal | Estimation method of modified soil strength and manufacturing method of modified soil using the same |
| JP7193105B1 (en) * | 2022-10-03 | 2022-12-20 | 強化土エンジニヤリング株式会社 | Ground injection method using ground injection material and ground injection material |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20030603 |