FR2842128A1 - Conversion of dredged silt into trench filling material by sieving, draining and mixing with used foundry sand, cement and polymer fibers - Google Patents

Conversion of dredged silt into trench filling material by sieving, draining and mixing with used foundry sand, cement and polymer fibers Download PDF

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Publication number
FR2842128A1
FR2842128A1 FR0208778A FR0208778A FR2842128A1 FR 2842128 A1 FR2842128 A1 FR 2842128A1 FR 0208778 A FR0208778 A FR 0208778A FR 0208778 A FR0208778 A FR 0208778A FR 2842128 A1 FR2842128 A1 FR 2842128A1
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France
Prior art keywords
sludge
silt
sieving
conversion
filling material
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FR0208778A
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French (fr)
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FR2842128B1 (en
Inventor
Arnould Jacquart
Naumann Regis Gremont
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Priority to FR0208778A priority Critical patent/FR2842128B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09C—RECLAMATION OF CONTAMINATED SOIL
    • B09C1/00—Reclamation of contaminated soil
    • B09C1/08—Reclamation of contaminated soil chemically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE
    • B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
    • B09B3/20—Agglomeration, binding or encapsulation of solid waste
    • B09B3/25—Agglomeration, binding or encapsulation of solid waste using mineral binders or matrix
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/0436—Dredged harbour or river sludge
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00—Excavations; Bordering of excavations; Making embankments
    • E02D17/06—Foundation trenches ditches or narrow shafts
    • E02D17/12—Back-filling of foundation trenches or ditches
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00017—Aspects relating to the protection of the environment
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00034—Physico-chemical characteristics of the mixtures
    • C04B2111/00103—Self-compacting mixtures
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Abstract

Conversion of dredged silt into trench filling material procedure consists of taking dredges silt from rivers and other water courses, sieving it to remove foreign bodies, and storing it in tanks where it is covered and allowed to drain naturally to a given water content. Conversion of dredged silt into trench filling material procedure consists of taking dredges silt from rivers and other water courses, sieving it to remove foreign bodies, and storing it in tanks where it is covered and allowed to drain naturally to a given water content. The silt is then removed as required and transferred to the hopper of a mixing plant of the type used for concrete and mixed with used foundry sand, 4-10 mm slag granules, a special cement and polymer fibers, with added water if necessary. The mixture is transported in a concrete mixer truck to the site of use and tipped directly into a trench.

Description

La présente invention concerne l'élimination des boues de dragage, deThe present invention relates to the disposal of dredging sludge,

fleuves, de rivières ou de tous cours d'eau en général, d'origine minérale essentiellement, par valorisation en coulis auto compactant, utilisé pour le remblaiement de tranchées d'assainissement, d'adduction d'eau ou de  rivers, streams or any watercourse in general, mainly of mineral origin, by recovery in self-compacting grout, used for backfilling trenches for sanitation, water supply or

différents concessionnaires, tels EDF, GDF, etc.....  different dealers, such as EDF, GDF, etc .....

Aujourd'hui, les boues de dragage, sont stockées à proximité du lieu de dragage, parfois traitées  Today, dredging sludge is stored near the dredging site, sometimes treated

au liant hydraulique, et dans le meilleur des cas, isolées du sol, par une membrane plastic.  with hydraulic binder, and in the best case, isolated from the ground, by a plastic membrane.

Cependant, cette solution n'apporte aucune garantie de pérennité relative à la non solubilité des éléments 10 toxiques ou indésirables, contenues dans les boues, au fur et à mesure de la dégradation du pH, et ces stocks ainsi constitués, pourraient éventuellement être assimilés à des décharges, et interdits selon la législation (CET 2 prohibés à compter du 1er juillet 2002) La présente invention permet l'utilisation de ces boues, en coulis auto compactant, à destination de  However, this solution does not provide any guarantee of durability relative to the insolubility of toxic or undesirable elements 10 contained in the sludge, as the pH degrades, and these stocks thus constituted, could possibly be assimilated to landfills, and prohibited by law (CET 2 prohibited from July 1, 2002) The present invention allows the use of this sludge, in self-compacting grout, intended for

la géotechnique routière, et plus particulièrement, dans le domaine du remblaiement de tranchées.  road geotechnics, and more particularly, in the field of trench backfilling.

Après dragage du cours d'eau avec les moyens traditionnels connus à ce jour, les boues sont " dé grillées " au fur et à mesure, sur une grille fixe ou vibrante selon leur siccité, les corps étrangers, sont stockés séparément et éliminés dans des filières adéquates.  After dredging the watercourse with traditional means known to date, the sludge is "toasted" as and when, on a fixed or vibrating grid according to their dryness, the foreign bodies, are stored separately and eliminated in adequate channels.

Les boues sont déversées, après identification chimique, dans des bassins de confinement, protégés par un tissu imperméable du type géomembrane, constitués de telle manière, qu'ils permettent la 20 déshydratation naturelle de ces boues, jusqu'à atteindre une siccité de l'ordre de 60%. (vérifiée quotidiennement), en évitant la mise en oeuvre d'énergie concourant à la déshydratation complète, des boues, puisque l'eau résiduelle sera indispensable pour la fabrication du coulis.  The sludge is poured, after chemical identification, into containment basins, protected by an impermeable fabric of the geomembrane type, constituted in such a way that they allow the natural dewatering of this sludge, until reaching a dryness of the around 60%. (checked daily), avoiding the use of energy contributing to the complete dewatering of sludge, since the residual water will be essential for the manufacture of the grout.

Les boues, partiellement déshydratées, sont alors extraites du bassin au fur et à mesure des besoins, pour être déversées dans la trémie réceptrice, d'une installation de malaxage, type centrale à  Sludge, partially dehydrated, is then extracted from the basin as and when required, to be discharged into the receiving hopper, from a mixing plant, central type to

béton.concrete.

Un autre déchet, type sable de fonderie usé, ainsi que des agrégats de granulométrie 4-10 mm, (scories d'aciéries inertes) sont dirigées, avec les boues, dans des proportions bien précises, vers un malaxeur. En même temps que s'effectue l'opération de malaxage, sont ajoutés un ciment spécial et des fibres polypropylène, et si besoin est, un complément en eau.  Another waste, of the used foundry sand type, as well as aggregates with a particle size of 4-10 mm (inert slag from steelworks) are sent, with the sludge, in very precise proportions, to a mixer. At the same time as the mixing operation is carried out, a special cement and polypropylene fibers are added, and if necessary, additional water.

Cette opération de malaxage s'effectue par gâchée de 0,75, 1 ou 2 m3, selon le dimensionnement  This mixing operation is carried out by a mix of 0.75, 1 or 2 m3, depending on the size

de l'installation.of the installation.

Il est primordial de s'assurer que la composition de la boue respecte bien les proportions suivantes: % d'origine minérale et 20% d'organique La présence de matières organiques confère au mélange, les caractéristiques tixotropiques  It is essential to ensure that the composition of the mud respects the following proportions:% of mineral origin and 20% organic The presence of organic matter gives the mixture the tixotropic characteristics

indispensables permettant d'assurer une certaine viscosité, et ainsi de remplir au maximum les aspérités en creux de la tranchée, d'épouser au plus prés, le contour du tuyau, de la conduite ou du fourreau et de bloquer, par serrage, la conduite à l'emplacement choisi.  essential to ensure a certain viscosity, and thus to fill to the maximum the asperities hollow of the trench, to marry as close as possible, the outline of the pipe, the pipe or the sheath and to block, by tightening, the pipe at the chosen location.

Le mélange est ensuite chargé dans une toupie, transporté jusqu'au chantier de mise en oeuvre, et 40 déversé directement dans la tranchée. Les canalisations ainsi que les filets avertisseurs devront être sérieusement arrimés afin de ne pas remonter dans le coulis déposé, sous l'effet de la poussée hydrostatique  The mixture is then loaded into a router, transported to the work site, and poured directly into the trench. The pipes as well as the warning nets must be seriously stowed so as not to go back up in the deposited grout, under the effect of the hydrostatic thrust

La boue ainsi traitée au ciment, présente un pH élevé (11 à 12), bloque la lixiviation, et le fait que le remblaiement de la tranchée se termine le plus souvent, par la mise en place d'une couche de béton 50 bitumineux, imperméable à l'eau, du fait de l'interface réalisée par une couche de cure à l'émulsion de bitume 65R, mise en oeuvre sur la surface supérieure du coulis auto compactant, réduit autant que faire se peut, le risque de lixiviation d'éventuels éléments toxiques ou indésirables, contenus dans la boue. Le coulis constitué de déchets et de sous produits pléthoriquement disponibles et encombrants, devient un produit " anobli " et utilisable sans risque.  The mud thus treated with cement, has a high pH (11 to 12), blocks leaching, and the fact that the backfilling of the trench ends most often, by the installation of a layer of 50 bituminous concrete, waterproof, due to the interface produced by a 65R bitumen emulsion cure layer, applied on the upper surface of the self-compacting grout, reduces as much as possible the risk of leaching out '' any toxic or undesirable elements contained in the mud. The grout consisting of waste and plethorically available and bulky by-products, becomes a product "ennobled" and usable without risk.

Le coulis ainsi constitué, ne fait l'objet à ce jour, d'aucune normalisation au niveau de ses  The grout thus formed, is not subject to this day, any standardization in terms of its

caractéristiques, sauf en ce qui concerne sa consistance qui respecte les prescriptions de la norme NFP 18-451. Il fait, par contre, l'objet d'une recommandation de la part du CERTU (Centre d'étude sur les réseaux, les transports, l'urbanisme et les constructions publiques) et est à classer dans la catégorie des produits non essorables, dont la capacité portante est obtenue par la prise et le durcissement du liant.  characteristics, except for its consistency which complies with the requirements of standard NFP 18-451. On the other hand, it is the subject of a recommendation from CERTU (Center for studies on networks, transport, town planning and public buildings) and is to be classified in the category of non-wringable products, whose bearing capacity is obtained by setting and hardening the binder.

Le coulis mis au point selon la présente description, répond en tous points, à cette  The grout developed according to this description responds in all respects to this

recommandation. Par ailleurs, des essais d'imbibition/dessiccation réalisés ont montré un bon comportement, à savoir: - pas de baisse de résistance  recommendation. In addition, imbibition / drying tests carried out showed good behavior, namely: - no drop in resistance

- performances correctes suite à des tests geVdégel.  - correct performance following geVdefrost tests.

Claims (2)

REVENDICATIONS 1. Procédé de transformation des boues de draguage en coulis auto compactant pour remblaiement des tranchées d'assainissement ou autres, caractérisé par les étapes suivantes: - draguage des boues ou vases (majoritairement d'origine minérales) selon les méthodes traditionnelles mise en dépôt de ces vases après dégrillage, afin de séparer les corps étrangers de celles-ci - déshydratation naturelle pour atteindre la siccité adéquate - reprise et extraction de ces boues au fur et à mesure des besoins - introduction de ces boues dans la trémie réceptrice d'une installation de malaxage, type centrale à béton  1. Process for transforming dredging sludge into self-compacting slurry for backfilling sanitation trenches or other, characterized by the following stages: - dredging sludge or vases (mainly of mineral origin) according to traditional methods of depositing these vases after screening, in order to separate the foreign bodies from them - natural dehydration to reach adequate dryness - recovery and extraction of this sludge as and when required - introduction of this sludge into the receiving hopper of an installation mixing plant, concrete plant type - malaxage de ces boues avec des sables de fonderies usés, identifiés et criblés, un agrégat de granulométrie 4-10 mm (scories inertes d'aciéries électriques), un ciment spécial et fibres polypropylène, et si besoin, un complément en eau, le tout, dans des proportions bien précises.  - mixing of this sludge with worn, identified and screened foundry sands, an aggregate with a particle size of 4-10 mm (inert slag from electrical steelworks), a special cement and polypropylene fibers, and if necessary, additional water, everything, in very precise proportions. 2. Procédé selon la revendication 1. caractérisée en ce que le coulis ainsi obtenu est chargé sur  2. Method according to claim 1. characterized in that the grout thus obtained is loaded on un camion malaxeur et déversé directement dans la tranchée.  a mixer truck and dumped directly into the trench.
FR0208778A 2002-07-11 2002-07-11 METHOD OF CONVERTING SELF-DREDGING SLUDGE INTO FILLING FOR SANITATION TRENCHES OR THE LIKE Expired - Fee Related FR2842128B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT1068U1 (en) * 1994-07-18 1996-10-25 Braun Medical Ag STERILIZABLE SET FOR SELF-INJECTION FOR ONE-TIME USE
FR2868973A1 (en) * 2004-04-19 2005-10-21 Naumann Regis Gremont Incinerated waste clinker treatment process consists of mixing with foundry sand, inert slag and cement for use as road-building material
FR2874214A1 (en) * 2004-08-12 2006-02-17 Ecological Cleaning Solutions Stabilization and solidification of e.g. drilling fluid or muds containing hydrocarbons and heavy metals, adds fine adsorbent plastic, sodium silicate and cement

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106277880B (en) * 2016-07-28 2019-04-02 武汉钢铁集团开圣科技有限责任公司 A kind of preparation method of the thin tailings-sand filling material of wholegrain grade

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4539121A (en) * 1984-01-18 1985-09-03 Kapland Mitchell A Bay mud stabilization
WO1998051636A1 (en) * 1997-05-15 1998-11-19 Ecdc East, Lc Method for treatment of dredged materials to form a structural fill
RU2162068C1 (en) * 1999-07-28 2001-01-20 Кнатько Василий Михайлович Mix for dicontamination and lithification of household garbage and industrial waste, and bottom sediments

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4539121A (en) * 1984-01-18 1985-09-03 Kapland Mitchell A Bay mud stabilization
WO1998051636A1 (en) * 1997-05-15 1998-11-19 Ecdc East, Lc Method for treatment of dredged materials to form a structural fill
RU2162068C1 (en) * 1999-07-28 2001-01-20 Кнатько Василий Михайлович Mix for dicontamination and lithification of household garbage and industrial waste, and bottom sediments

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 200123, Derwent World Patents Index; Class A35, AN 2001-225283, XP002234509 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT1068U1 (en) * 1994-07-18 1996-10-25 Braun Medical Ag STERILIZABLE SET FOR SELF-INJECTION FOR ONE-TIME USE
FR2868973A1 (en) * 2004-04-19 2005-10-21 Naumann Regis Gremont Incinerated waste clinker treatment process consists of mixing with foundry sand, inert slag and cement for use as road-building material
FR2874214A1 (en) * 2004-08-12 2006-02-17 Ecological Cleaning Solutions Stabilization and solidification of e.g. drilling fluid or muds containing hydrocarbons and heavy metals, adds fine adsorbent plastic, sodium silicate and cement

Also Published As

Publication number Publication date
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