EP1805374A1 - Verfahren zur entwässerung einer aufschlämmung - Google Patents

Verfahren zur entwässerung einer aufschlämmung

Info

Publication number
EP1805374A1
EP1805374A1 EP05776352A EP05776352A EP1805374A1 EP 1805374 A1 EP1805374 A1 EP 1805374A1 EP 05776352 A EP05776352 A EP 05776352A EP 05776352 A EP05776352 A EP 05776352A EP 1805374 A1 EP1805374 A1 EP 1805374A1
Authority
EP
European Patent Office
Prior art keywords
slurry
soil
water
anionic polyacrylamide
watering
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.)
Granted
Application number
EP05776352A
Other languages
English (en)
French (fr)
Other versions
EP1805374B1 (de
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/de
Application granted granted Critical
Publication of EP1805374B1 publication Critical patent/EP1805374B1/de
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 imention relates tojet gioutingand to chemical compositions for use in j el grouting
  • Jet giouting is a soil consolidating teclinique, widely used for many civil engineering applications For example, it can be used to provide foundations for ultimatelyctuics to be erected, to underpin existing sliucluies, to create low pe ⁇ ncdbihtv ba ⁇ ieis, to create ietaining or supporting stnictuies to rcmfoice a soil mass and to complement othci geotechnical structures
  • the jet grouting piocess consists of the disaggregation of the soil or weak rock and its mixing with, and 10 partial replacement by, a cementing agent, normally a cement based giout, the disaggregation is achieved by means of a high energy jet of a fluid which can be watei or the grout itself depending on the system employed
  • This invention pio ⁇ ides a method of de-wate ⁇ ng a slurry mixture produced fiom a jet grouting operation, compi ising the addition to the mixture of an anionic polyacrylamide in such mannei that it is uniformly distributed therein, the anionic polyacryl amide having a high molecular weight and a low-medium charge density
  • An anionic polyacrylamide for use in this inv ention has a high molecular weight, that is, a weight-average molecular w eight of at least 4,000,000 The molecular weight is prefeiably between 5,000,000 and 20,000,000
  • the polyacrylamide has a low -medium chaige density Chai ge 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 theie are frequent references in the commercial hteratui e It is quoted as the percentage of the sodium acrylate content of the polymer
  • a low-medium charge density is one w hich lies within the i ange of from 5-70%
  • Those high MW anionic polyacrylamides having a charge density of from 10%-50% are the most effectiv e and are the prefe ⁇ ed matenals for the purposes of this in ⁇ ention Among the commercially-axailable mate ⁇ als which
  • the dosage used is fiom 150-500, preferably fiom 200-350, ppm of the sluiry
  • the polyacrylamide is First dissolved in water, to gi ⁇ e a topical! 05-1% weight solution, and this solution is added to the slurry with stirring This has the effect of separating water out of the soil-cement sluiry, and changing the consistency of
  • the slurry from fluid to mortai-like The sepaiation normally takes less than 5 minutes when some agitation is employed, and the sepaiated 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 aftet appropriate neutiahzation can be simply discharged into the sewage system, or where allowed, the open enviionment
  • the disposal cost such as in a landfill for the abovementioned ; slurry would be diasticalh ieduced, because of the lowei ⁇ olume of slurry due to de-wate ⁇ ng and the lower pi ice for disposing of dry material as opposed to fluid mate ⁇ al
  • the solids content by weight of a slurry to be treated should generally be 50% maximum, prefciably 45% maximum, as ⁇ measuied b ⁇ dning a sample in an o ⁇ en at 105 0 C
  • contents figuies are based on a relatively uniform distribution of particle sizes of clay, silt, cement, etc in the slurry
  • the measuied solids content of a given sample can be considerably higher hi such a case, the performance of the piocess of the imention is 5 unaffected, and, for the purposes of this invention, such a slurry is consideied to fall within the solids content limits given hereinabo ⁇ e
  • a se ⁇ es of anionic polyacrylamides are tested for dewate ⁇ ng activity
  • the mateiials tested are as follows Example No, Polvacrylamide Avera ⁇ e MW Charge densitv 1 SED ⁇ PUR APl oo 10,000,000 10% 2 SEDIPUR AF203 5,000,000 20% SEDDPUR AP204 12,000,000 20%
  • 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 polyacrylaimide 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 Verfahren zur entwässerung einer aufschlämmung Not-in-force EP1805374B1 (de)

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 true EP1805374A1 (de) 2007-07-11
EP1805374B1 EP1805374B1 (de) 2010-05-19

Family

ID=33427906

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05776352A Not-in-force EP1805374B1 (de) 2004-10-01 2005-08-24 Verfahren zur entwässerung einer aufschlämmung

Country Status (10)

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

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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006037403A1 *

Also Published As

Publication number Publication date
AU2005291642B2 (en) 2009-10-01
NO20072228L (no) 2007-07-02
GB0421841D0 (en) 2004-11-03
JP2008514411A (ja) 2008-05-08
EP1805374B1 (de) 2010-05-19
DE602005021386D1 (de) 2010-07-01
ES2345990T3 (es) 2010-10-07
CN101035951A (zh) 2007-09-12
AU2005291642A1 (en) 2006-04-13
WO2006037403A1 (en) 2006-04-13
CN101035951B (zh) 2010-05-26
ATE468439T1 (de) 2010-06-15

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