JP3678834B2 - Usage of hard dehydrated cake fine particles - Google Patents
Usage of hard dehydrated cake fine particles Download PDFInfo
- Publication number
- JP3678834B2 JP3678834B2 JP06509796A JP6509796A JP3678834B2 JP 3678834 B2 JP3678834 B2 JP 3678834B2 JP 06509796 A JP06509796 A JP 06509796A JP 6509796 A JP6509796 A JP 6509796A JP 3678834 B2 JP3678834 B2 JP 3678834B2
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- fine particles
- dehydrated cake
- muddy water
- mud
- cake
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- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Processing Of Solid Wastes (AREA)
- Treatment Of Sludge (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Description
【０００１】
【産業の属する技術分野】
本発明は、残存生コンクリートより骨材を分離した後のスラッジを、即時脱水して得られた硬質ケーキをさらに細粒状化した微粒子Ｂの利用方法に関する。
【０００２】
【従来の技術】
スラッジの脱水は、翌日に行われている従来の処理方法では、脱水ケーキはセメントの水和反応が進行していて硬化しないため、その再利用の方法がなく、規制型産業廃棄物として扱われていたことによって、その多大な処理費や、公害等に問題点が多々あった。それらの問題点を解決するために、本出願人は、前記のような、スラッジの即時脱水工法と装置を発明した。該工法によって得られた活性脱水ケーキを再利用しやすい形状に造粒し微粒子Ａとなす方法（平成７年特許願第１３０９９０号）を発明した。
【０００３】
【発明が解決しようとする課題】
本出願人は、即時脱水する方法を発明し、それによって得られたケーキは、未水和部分が大きいので含水率を２５〜３０％迄効率良く脱水することができることを知った。こうして取り出したケーキは、採取後時間の経過とともに硬化が進行し、生コンクリートに劣らない圧縮強度を得ることができるようになった。その採取されたケーキを段階的に粉砕、乾燥し微粒子Ｂとし、その特性を活かした用途を開発したものである。
【０００４】
【課題を解決するめの手段】
残存生コンクリートの骨材を分離したスラッジを、３〜４時間以内に脱水して得られた活性脱水ケーキを、所定養生時間経過後、造粒装置にて粒状とした粒状ケーキにおいて、さらに、有天蓋の貯溜場に１〜３日間の養生行程を経で乾燥と粉砕工程を経て粒度０．１５ｍｍ程度以下の微粒子Ｂを作る。
前記微粒子Ｂを土木工事で発生する泥水の処理における従来の固化材の代わりに増量材として混入する方法。又、前記微粒子Ｂを軟弱地盤の、地盤改良用固化材の主原料とする方法。
さらに、ベントナイト泥水及び関東ローム層等粘土質土壌から発生する低濃度の泥水で従来、そのままでは脱水困難な微粒成分の泥水において凝集剤の代りに微粒子Ｂを脱水助剤として混入する方法である。
【０００５】
【作用】
請求項１について、土木工事における泥水処理の固化材として使用する場合について、従来の土木工事において、水位の高い地盤又は基礎工事の種別によって、水を使用する工法については、発生する多量の泥水で高濃度のものは、工事現場より搬出する手段として、該泥水に固化材（市販のもの）を概ね泥水１Ｍ３につき２００ｋｇ〜１００ｋｇを混合かきまぜて固化状となし、搬出していた。この固化材の代わりに、該微粒子Ｂを使用するものである。
「表１」は微粒子Ｂと固化材（市販品）の物性比較表であり、「表２」は残土代替材料としての配合試験結果表、「表３」は、固化材の増量材としての配合試験結果表である。
【０００６】
【表１】
【表２】
【表３】
「表１」において、吸水量試験、比表面積試験をおこなったもので、いずれも微粒子Ｂが市販固化材より優れているという結果を得た。
【００１０】
請求項２は、上記の結果に示す微粒子Ｂの特性を利用するものとして、軟弱地盤の固化を行い、地盤改良をなすものである。
さらに請求項３について、これは、低濃度泥水の処理における脱水助剤として使用するものであり、低濃度の場合は、固化材を使用するには不経済であるので、従来は脱水機にて、脱水するのであるが、それにはやはり脱水助剤として凝集剤を使用して脱水している。本開発の微粒子Ｂを脱水助剤として混入することにより、前記高価な凝集剤を使用することなくベントナイト泥水及び関東ローム層泥水等についても効率よく脱水することができる。
「図１」はベントナイト泥水における従来使用している凝集剤と微粒子Ｂとの濾過性比較図である。
【００１１】
【図１】
【００１２】
【発明の実施の形態】
前記用途に供するための基本的試験は下記の通りである。
流動化処理土工法の要求性能および目標値は次の通りである。
▲１▼ 高流動性（締固めを必要としない高流動性） 公団フロー値１６０〜３００ｍｍ
▲２▼ 低フリーディング性（材料分離がなく高品質）：フリーディング率３％以下
▲３▼ 低強度性（埋戻し後に再掘削が容易な低強度）：一軸圧縮強さ０．２〜１．０ＭＰａ
残土代替材料の検討として上記目標を満足する処理土１ｍ３当りの固化材料、微粒子Ｂ量及び、水量を把握するための配合試験を実施した。また固化材の増量の検討として阿蘇黒ボクと微粒子Ｂ及び水量を把握すめための配合試験を実施した。
【００１３】
試験結果
微粒子Ｂの残土代替材料としての試験結果を「表２」に示し固化材の増量材としての試験結果を「表３」に示す。試験結果より「表２」および「表３」にしめした配合により、微粒子Ｂの流動化処理工法の適用が可能であることが判明した。なお、本配合選定試験は、所用の性能が得られるよう微粒子Ｂの使用を適宜著性したがその使用条件にちいて更に検討を要する。
【００１４】
「図１」に示すように、ベントナイト使用の泥水を濾過脱水した場合、無添加の場合の脱水はもとより、市販の凝集剤を７．５％混入した場合と、微粒子Ｂを１５％混入した場合を比較した場合、濾過時間１０分未満において、濾過水量は微粒子Ｂの成績が上回り、以後明らかに脱水効率が優れているという結果を得た。
【００１５】
【発明の効果】
本発明の大きな効果として、先ず第一に言えることは、従来規制型産業廃棄物として処理されなければならならなかったものが、そのまま再資源として利用されるということは、公害防止をし環境保全をなすという面での大きな効果である。
次に、上げられることは、経済的効果である。固化材として使用するとすれば、市販固化材は末端で１２，０００円〜１５，０００円／ｔ当り、である。脱水ケーキを微粒子Ｂとするまでの設備費と人件費はｔ当り３，０００円程度であるので生コン工場側としては、従来の産業廃棄物としての処理費の支出額が一転して販売収益となる効果は大きい。又、凝集剤の替りとしての脱水助剤の場合混入量において市販の凝集剤の約２倍を必要とするも、価額において市販凝集剤は、１８ｌ缶（液体）＠２，４００円〜２，６００円／缶であるのでその効果も大変に大きい。
以上のような効果のある硬質脱水ケーキ微粒子の使用法である。
【図面の簡単な説明】
図１はベントナイト泥水における従来使用している凝集剤と微粒子Ｂとの濾過性比較図である。[0001]
[Technical field to which industry belongs]
The present invention relates to a method of using fine particles B obtained by further finely granulating a hard cake obtained by immediately dewatering sludge after separating aggregate from residual ready-mixed concrete.
[0002]
[Prior art]
In the conventional treatment method that is performed the next day, sludge is treated as regulated industrial waste because the dehydrated cake does not harden because the hydration reaction of the cement proceeds and does not harden. As a result, there were many problems in the large processing costs and pollution. In order to solve these problems, the present applicant has invented the method and apparatus for instant dewatering of sludge as described above. The inventors have invented a method (1995 Patent Application No. 130990) in which the activated dehydrated cake obtained by this method is granulated into a shape that can be easily reused to form fine particles A.
[0003]
[Problems to be solved by the invention]
The present inventor has invented a method of immediate dehydration, and knew that the cake obtained thereby can be efficiently dehydrated to a moisture content of 25 to 30% because the unhydrated portion is large. The cake taken out in this way was cured with the passage of time after collection, and a compressive strength not inferior to that of ready-mixed concrete could be obtained. The collected cake was pulverized and dried step by step to form fine particles B, and the application utilizing the characteristics was developed.
[0004]
[Means for solving the problems]
An activated dehydrated cake obtained by dewatering sludge from which the aggregate of residual green concrete is dehydrated within 3 to 4 hours is further added to a granular cake granulated by a granulator after a predetermined curing time. Fine particles B having a particle size of about 0.15 mm or less are made in a canopy reservoir through a drying process and a grinding process after a curing process of 1 to 3 days.
A method in which the fine particles B are mixed as an extender instead of the conventional solidified material in the treatment of muddy water generated in civil engineering work. A method of using the fine particles B as a main raw material for a softening ground solidifying material.
Furthermore, it is a method in which fine particles B are mixed as a dehydrating aid in place of a flocculant in a mud of low-concentration components which are conventionally difficult to dehydrate with low-concentration muddy water generated from a clay soil such as bentonite mud and Kanto loam layer.
[0005]
[Action]
About claim 1, in the case of using as solidification material for muddy water treatment in civil engineering work, in the conventional civil engineering work, depending on the type of ground or foundation construction with a high water level, a large amount of mud generated high concentrations of things, as a means for unloading from the construction site,該泥water solidifying material (commercially available) a generally solidified form and without agitated mixing 200kg~100kg per mud 1M 3, was carried out. Instead of this solidifying material, the fine particles B are used.
“Table 1” is a physical property comparison table between fine particles B and solidified material (commercially available product), “Table 2” is a blending test result table as a residual soil substitute material, and “Table 3” is a blending material of the solidified material as an extender. It is a test result table.
[0006]
[Table 1]
[Table 2]
[Table 3]
In "Table 1", a water absorption amount test and a specific surface area test were performed, and both obtained the results that the fine particles B were superior to the commercially available solidified material.
[0010]
According to the second aspect of the present invention, the soft ground is solidified and the ground is improved by utilizing the characteristics of the fine particles B shown in the above result.
Further, for claim 3, this is used as a dehydration aid in the treatment of low-concentration mud water, and in the case of low concentration, it is uneconomical to use a solidifying material. It is dehydrated by using a flocculant as a dehydrating aid. By mixing the fine particles B of the present development as a dehydrating aid, it is possible to efficiently dehydrate bentonite mud and Kanto loam mud without using the expensive flocculant.
"FIG. 1" is a comparative view of filterability between a conventionally used flocculant and fine particles B in bentonite mud.
[0011]
[Figure 1]
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Basic tests for use in the above applications are as follows.
The required performance and target values of the fluidized earth method are as follows.
▲ 1 ▼ High fluidity (High fluidity that does not require compaction) Public corporation flow value 160-300mm
(2) Low freeing property (high quality without material separation): Freezing rate of 3% or less (3) Low strength (low strength easy to re-excavate after backfilling): Uniaxial compressive strength 0.2-1 .0 MPa
As a study of surplus soil substitute materials, a blending test was conducted to grasp the solidified material, the amount of fine particles B, and the amount of water per 1 m 3 of the treated soil satisfying the above target. In addition, as a study of increasing the amount of solidified material, a blending test was conducted to ascertain the amount of Aso Black Me, fine particles B, and water.
[0013]
Test Results Test results of the fine particles B as a residual soil substitute material are shown in “Table 2”, and test results of the solidified material as an extender are shown in “Table 3”. From the test results, it was found that the fluidization treatment method for the fine particles B can be applied according to the formulations shown in “Table 2” and “Table 3”. In this blending selection test, the use of the fine particles B was appropriately marked so as to obtain the required performance, but further examination is required according to the use conditions.
[0014]
As shown in "Fig. 1", when dewatering bentonite-containing muddy water, 7.5% of commercially available flocculant and 15% of fine particles B are mixed, as well as dehydration without addition. When the filtration time was less than 10 minutes, the filtration water amount exceeded the result of the fine particles B, and thereafter, the dehydration efficiency was clearly superior.
[0015]
【The invention's effect】
As a major effect of the present invention, the first thing that can be said is that what had to be treated as regulated industrial waste in the past can be used as a resource as it is to prevent pollution and preserve the environment. It is a big effect in terms of making.
Next, what is raised is the economic effect. If used as a solidifying material, the commercial solidifying material is 12,000 yen to 15,000 yen / t at the end. The equipment cost and labor cost until the dehydrated cake is changed to fine particle B is about 3,000 yen per t. The effect is great. In addition, in the case of a dehydrating aid as a substitute for the flocculant, the amount required for mixing is about twice that of a commercially available flocculant. The effect is very large because it is 600 yen / can.
This is a method of using hard dehydrated cake fine particles having the above effects.
[Brief description of the drawings]
FIG. 1 is a comparative view of filterability between a conventionally used flocculant and fine particles B in bentonite mud.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06509796A JP3678834B2 (en) | 1996-02-14 | 1996-02-14 | Usage of hard dehydrated cake fine particles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06509796A JP3678834B2 (en) | 1996-02-14 | 1996-02-14 | Usage of hard dehydrated cake fine particles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09217343A JPH09217343A (en) | 1997-08-19 |
| JP3678834B2 true JP3678834B2 (en) | 2005-08-03 |
Family
ID=13277081
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06509796A Expired - Fee Related JP3678834B2 (en) | 1996-02-14 | 1996-02-14 | Usage of hard dehydrated cake fine particles |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3678834B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4698043B2 (en) * | 2001-03-01 | 2011-06-08 | 嘉昭 佐藤 | Concrete sludge fine powder recovery method and apparatus |
| JP5001732B2 (en) * | 2007-07-11 | 2012-08-15 | 鹿島建設株式会社 | Concrete for building foundation ground |
| JP6168711B2 (en) * | 2015-03-17 | 2017-07-26 | 三和石産株式会社 | Concrete sludge fine powder recovery method and concrete sludge fine powder |
-
1996
- 1996-02-14 JP JP06509796A patent/JP3678834B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09217343A (en) | 1997-08-19 |
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