EP1805374B1 - Method for de-watering a slurry - Google Patents

Method for de-watering a slurry Download PDF

Info

Publication number
EP1805374B1
EP1805374B1 EP05776352A EP05776352A EP1805374B1 EP 1805374 B1 EP1805374 B1 EP 1805374B1 EP 05776352 A EP05776352 A EP 05776352A EP 05776352 A EP05776352 A EP 05776352A EP 1805374 B1 EP1805374 B1 EP 1805374B1
Authority
EP
European Patent Office
Prior art keywords
slurry
soil
water
watering
charge density
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.)
Not-in-force
Application number
EP05776352A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1805374A1 (en
Inventor
Qiu Feng
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.)
Construction Research and Technology GmbH
Original Assignee
Construction Research and Technology GmbH
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 Construction Research and Technology GmbH filed Critical Construction Research and Technology GmbH
Publication of EP1805374A1 publication Critical patent/EP1805374A1/en
Application granted granted Critical
Publication of EP1805374B1 publication Critical patent/EP1805374B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil

Definitions

  • This invention relates to jet grouting and to chemical compositions for use in jet grouting.
  • Jet grouting is a soil consolidating technique, widely used for many civil engineering applications. For example, it can be used to provide foundations for structures to be erected, to underpin existing structures, to create low permeability barriers, to create retaining or supporting structures, to reinforce a soil mass, and to complement other geotechnical structures.
  • the jet grouting process consists of the disaggregation of the soil or weak rock and its mixing with, and partial replacement by, a cementing agent, normally a cement-based grout; the disaggregation is achieved by means of a high energy jet of a fluid which can be water or the grout itself, depending on the system employed.
  • a bore of typically 90-150 mm diameter is drilled in the soil to the depth to which the soil is to be consolidated.
  • a fluid water or the cementing grout itself
  • the rod is gradually withdrawn while injection through the rotating rod is continued.
  • the result is a cylindrical column of consolidated soil which will harden and form a consolidated soil element.
  • the movement of the rod can be manipulated to form soil mass of different geometry, such as columns and panels.
  • slurry which is a mixture of soil, cement and water.
  • the slurry is normally pumped away from the spot where the jet grouting operation is taking place, so, if the slurry is not fluid enough for pumping using a hydraulic conventional pump, additional water is normally added.
  • the result is a slurry which contains a very large proportion of water, frequently in excess of 80%.
  • Typical contents of a slurry are (by weight) 50-85% water and 15-50% each of both cement and soil (the latter generally clay or silty sand).
  • such slurries can include other ingredients, such as placticisers, superplasticisers, accelerators and retarders, added to modify the properties of the grout. Because of the presence of cement, such slurries often have high pH, sometimmes in excess of 12.
  • the amount of slurry produced varies, depending on the type of soil treated. In clay soil where the jet grouting operation is typically much slower, the amount of slurry produced can be considerable. While such slurries can sometimes be utilized in, for example, backfills, large amounts usually have to be disposed of in landfills, which is expensive for jet grouting contractors.
  • JP-A-07300852 discloses such a treatment.
  • This invention provides a method of de-watering a slurry mixture produced from a jet grouting operation, comprising the addition to the mixture of an anionic polyacrylamide in such manner that it is uniformly distributed therein, the anionic polyacrylamide having a high molecular weight and a low-medium charge density.
  • An anionic polyacrylamide for use in this invention has a high molecular weight, that is, a weight-average molecular weight of at least 4,000,000.
  • the molecular weight is preferably between 5,000,000 and 20,000,000.
  • the polyacrylamide has a low-medium charge density.
  • Charge density which is an indication of the number of charged species for a given molecular weight, is a parameter well known to the art and to which there are frequent references in the commercial literature. It is quoted as the percentage of the sodium acrylate content of the polymer.
  • a low-medium charge density is one which lies within the range of from 5-70%.
  • Those high MW anionic polyacrylamides having a charge density of from 10%-50% are the most effective and are the referred materials for the purposes of this invention.
  • the dosage used is from 150-500, preferably from 200-350, ppm of the slurry.
  • the polyacrylamide is first dissolved in water, to give a typically 0.5-1% weight solution, and this solution is added to the slurry with stirring.
  • This has the effect of separating water out of the soil-cement slurry, and changing the consistency of the slurry from fluid to mortar-like.
  • the separation normally takes less than 5 minutes when some agitation is employed, and the separated water can be simply drained out, or some pressure may be employed to press it out.
  • the water which comes out is normally clear, and after appropriate neutralization can be simply discharged into the sewage system, or where allowed, the open environment.
  • the disposal cost such as in a landfill for the abovementioned slurry would be drastically reduced, because of the lower volume of slurry due to de-watering, and the lower price for disposing of dry material as opposed to fluid material.
  • the solids content by weight of a slurry to be treated should generally be 50% maximum, preferably 45% maximum, as measured by drying a sample in an oven at 105°C.
  • contents figures are based on a relatively uniform distribution of particle sizes of clay, silt, cement, etc.in the slurry.
  • the measured solids content of a given sample can be considerably higher. In such a case, the performance of the process of the invention is unaffected, and, for the purposes of this invention, such a slurry is considered to fall within the solids content limits given hereinabove.
  • a series of anionic polyacrylamides are tested for dewatering activity.
  • the materials tested are as follows: Example No. Polyacrylamide Average MW Charge density 1 SEDIPUR AF100 10,000,000 10% 2 SEDIPUR AF203 5,000,000 20% 3 SEDIPUR AF204 12,000,000 20% 4 SEDIPUR AF205 19,000,000 20% 5 SEDIPUR TF2-TR 11,000,000 20% 6 SEDIPUR AF404 15,000,000 40% 7 SEDTPUR AF701 13,000,000 70% 8 SEDIPUR AF900 15,000,000 90%
  • the mateials are tested as follows. A slurry containing 25% fine soil (silt and clay), 15% cement and 60% water is prepared. Each of the polyacrylamides hereinabove mentioned is added with gentle stirring to a sample of this slurry at a rate of 280ppm. The effectiveness of each polyacrylamide is assessed by how quickly water is removed, how much Water is removed and how quickly the remaining solid forms a stiff mass as a result of this dewatering.

Landscapes

  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Paleontology (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Agronomy & Crop Science (AREA)
  • Civil Engineering (AREA)
  • Soil Sciences (AREA)
  • Soil Conditioners And Soil-Stabilizing Materials (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Treatment Of Sludge (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)
  • Glass Compositions (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
EP05776352A 2004-10-01 2005-08-24 Method for de-watering a slurry Not-in-force EP1805374B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB0421841.8A GB0421841D0 (en) 2004-10-01 2004-10-01 Process
PCT/EP2005/009112 WO2006037403A1 (en) 2004-10-01 2005-08-24 Method for de- watering a slurry

Publications (2)

Publication Number Publication Date
EP1805374A1 EP1805374A1 (en) 2007-07-11
EP1805374B1 true EP1805374B1 (en) 2010-05-19

Family

ID=33427906

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05776352A Not-in-force EP1805374B1 (en) 2004-10-01 2005-08-24 Method for de-watering a slurry

Country Status (10)

Country Link
EP (1) EP1805374B1 (ja)
JP (1) JP2008514411A (ja)
CN (1) CN101035951B (ja)
AT (1) ATE468439T1 (ja)
AU (1) AU2005291642B2 (ja)
DE (1) DE602005021386D1 (ja)
ES (1) ES2345990T3 (ja)
GB (1) GB0421841D0 (ja)
NO (1) NO20072228L (ja)
WO (1) WO2006037403A1 (ja)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6041509B2 (ja) * 2012-03-29 2016-12-07 栗田工業株式会社 自硬性汚泥の造粒固化処理土の製造方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5286806C1 (en) * 1993-05-14 2001-01-30 Cytec Tech Corp Methods of making and using high molecular weight acrylamide polymers
JP3540838B2 (ja) * 1994-05-02 2004-07-07 三信建設工業株式会社 ジェットグラウトの余剰スライム処理方法及び装置
US5961839A (en) * 1997-02-07 1999-10-05 Simmsgeiger; Patrick A. Method for clearing ornamental bodies of water
JPH10272306A (ja) * 1997-03-31 1998-10-13 Nitto Chem Ind Co Ltd 排泥水の脱水方法
US5922207A (en) * 1997-05-16 1999-07-13 Engelhard Corporation Filter aid for clay processing

Also Published As

Publication number Publication date
GB0421841D0 (en) 2004-11-03
DE602005021386D1 (ja) 2010-07-01
ES2345990T3 (es) 2010-10-07
EP1805374A1 (en) 2007-07-11
NO20072228L (no) 2007-07-02
CN101035951B (zh) 2010-05-26
ATE468439T1 (de) 2010-06-15
JP2008514411A (ja) 2008-05-08
CN101035951A (zh) 2007-09-12
AU2005291642B2 (en) 2009-10-01
AU2005291642A1 (en) 2006-04-13
WO2006037403A1 (en) 2006-04-13

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