DE3540894C1 - Bringing about a temporary load-bearing capability of concrete - Google Patents
Bringing about a temporary load-bearing capability of concreteInfo
- Publication number
- DE3540894C1 DE3540894C1 DE19853540894 DE3540894A DE3540894C1 DE 3540894 C1 DE3540894 C1 DE 3540894C1 DE 19853540894 DE19853540894 DE 19853540894 DE 3540894 A DE3540894 A DE 3540894A DE 3540894 C1 DE3540894 C1 DE 3540894C1
- Authority
- DE
- Germany
- Prior art keywords
- concrete
- temporary load
- additives
- bearing capability
- bringing
- 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.)
- Expired
Links
Classifications
-
- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0092—Temporary binders, mortars or concrete, i.e. materials intended to be destroyed or removed after hardening, e.g. by acid dissolution
-
- 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
-
- 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
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
-
- 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
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
- Sealing Material Composition (AREA)
Abstract
Description
Die Erfindung beschäftigt sich mit der Erzeugung einer temporären Tragfähigkeit von Beton.The invention is concerned with the generation of a temporary Load capacity of concrete.
Bei der DE-AS 24 09 216 werden zu diesem Zweck nichtalkalibeständige künstliche Mineralfasern, wie Glas-, Stein- oder Schlackfasern, mit örtlicher Konzentrierung in einer Matrix eingesetzt. Das ist von der kosten- und handhabungstechnischen Seite her gesehen verhältnismäßig aufwendig.In DE-AS 24 09 216 non-alkali-resistant are used for this purpose artificial mineral fibers, such as glass, stone or slag fibers, with local concentration used in a matrix. That is from the From a cost and handling perspective, it is relative complex.
Im Tiefbau kann es aus unterschiedlichen Gründen sinnvoll sein, einen Beton herzustellen, der nur über einen begrenzten Zeitraum seine Trag fähigkeit behält. Nach Ablauf dieser Zeitspanne soll er im Regelfall sowohl sein Tragverhalten als auch seine Dichtigkeit (Wasserundurch lässigkeit) verlieren. Dieses Verfahren ist z. B. bei bergmännisch auf gefahrenen Tunneln erwünscht, bei denen es zur Entzerrung der Ar beitsvorgänge sinnvoll ist, erst eine vorläufige Sicherung einzubringen, in die dann die endgültige Sicherungsschale, unabhängig von dem Vor trieb, eingebracht werden kann. Zur Herstellung des endgültigen Trag verhaltens von Gebirge und Hohlraumsicherung ist hierbei ein weiteres Tragverhalten der vorläufigen Sicherung teilweise unerwünscht. Insbe sondere gilt dies für vorläufige Sicherungen aus Extrudierbeton in Bergsenkungsgebieten. Ein weiteres Anwendungsgebiet solcher Betone ergibt sich bei Verbauwänden. Hier kann der Beton als Ausfachung von Trägerbohlwänden oder bei Bohrpfahlwänden genutzt werden. Ein späteres Entfernen des Verbaus bzw. die Wiederherstellung der unein geschränkten Grundwasserdurchlässigkeit wird hierdurch erreicht. Die ser Beton eignet sich auch zur Herstellung von temporär wirksamen Dichtwänden. In civil engineering, it can make sense for a variety of reasons To produce concrete that is only used for a limited period of time ability retains. After this period, he should normally both its load-bearing behavior and its tightness (water impermeable lose). This method is e.g. B. in mining driven tunnels where it is necessary to equalize the ar it makes sense to introduce a preliminary backup first, into the then the final safety shell, regardless of the previous drove, can be introduced. To make the final support The behavior of mountains and cavity protection is another Wearing behavior of the provisional securing is sometimes undesirable. In particular this applies in particular to provisional fuses made of extruded concrete in Subsidence areas. Another area of application for such concretes results from shoring walls. Here the concrete can be used as infill of girder screed walls or for bored pile walls. A later removal of the shoring or the restoration of the disunited restricted groundwater permeability is achieved. The This concrete is also suitable for the production of temporarily effective Sealing walls.
Der Erfindung liegt die Aufgabe zugrunde, die temporäre Tragfähigkeit des Betons auf einfachere Weise als bisher zu erreichen, und zwar ins besondere nicht durch Zuschlagstoffe, die in vorgegebener Verteilung beigegeben werden müssen.The invention has for its object the temporary load-bearing capacity to achieve the concrete in a simpler way than before special not through aggregates in a given distribution must be added.
Zur Lösung dieser Aufgabe lehrt die Erfindung die Verwendung von treibenden, sulfathaltigen Zuschlagstoffen oder von hochalkalischen Zementen in Verbindung mit nichtalkalibeständigen Zuschlagstoffen in Beton zum Zwecke der Erzeugung einer temporären Tragfähigkeit des Betons.To achieve this object, the invention teaches the use of driving, sulfate-containing additives or highly alkaline Cements in combination with non-alkali resistant aggregates in Concrete for the purpose of creating a temporary bearing capacity of the Concrete.
Nach bevorzugter Ausführungsform werden Opalsandsteine als Zuschlag stoffe beigegeben, die ansonsten als schädliche bzw. unerwünschte Be tonzuschläge angesehen werden. (Wendehorst "Baustoffkunde", 1975, Seite 311).According to a preferred embodiment, opal sandstones are used as a surcharge added substances that are otherwise considered harmful or undesirable loading tone supplements can be viewed. (Wendehorst "Building Materials Science", 1975, Page 311).
Unerwarteterweise erreicht man mit den genannten Zuschlagstoffen bzw. Zuschlagstoffkombinationen einen Beton, bei dem die Größe und das zeitliche Verhalten der Tragfähigkeit auch ohne örtliche Konzentrierung über die Beigabemenge definiert eingestellt werden kann.Unexpectedly, the additives or Aggregate combinations a concrete where the size and the temporal behavior of the load-bearing capacity even without local concentration can be set via the amount added.
Bereits bei der Herstellung werden in den Beton die Materialien zuge geben, die zu der Beendigung seiner Tragfähigkeit nach einem defi nierten Zeitraum führen. Die Dosierung dieser Zusatzstoffe erfolgt so, daß nahezu keine Volumenveränderungen auftreten, sondern nur das innere Gefüge des Betons zerstört wird. Hierdurch wird sowohl seine Tragf ähigkeit als auch seine Dichtwirkung aufgehoben. Der Zeitpunkt der Zerstörung des inneren Betongefüges wird durch die unterschied liche Dosierung der zugemischten treibenden Zusätze bestimmt. Die tem poräre Festigkeit des Betons wird entsprechend den Festlegungen der einschlägigen DIN-Normen bestimmt. Das Volumen des zerstörten Betons entspricht nahezu dem des unzerstörten Betons. Der Beton kann aber auch mit Hohlräumen, z. B. in Form eines Gasblasen aufweisenden Be tons, eingebracht werden, damit er im Falle einer äußeren Einwirkung im Volumen nachgeben kann.The materials are drawn into the concrete during manufacture give that to the termination of its bearing capacity after a defi period. These additives are dosed in such a way that almost no volume changes occur, only that internal structure of the concrete is destroyed. This will make both his Load capacity and its sealing effect canceled. Point of time the destruction of the internal concrete structure is distinguished by the determined dosage of the admixed driving additives. The tem porous strength of the concrete is determined in accordance with the relevant DIN standards. The volume of the destroyed concrete corresponds almost to that of the undamaged concrete. But the concrete can also with cavities, e.g. B. in the form of a gas bubbles Be tons, so that it can be used in case of external influences can yield in volume.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19853540894 DE3540894C1 (en) | 1985-11-18 | 1985-11-18 | Bringing about a temporary load-bearing capability of concrete |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19853540894 DE3540894C1 (en) | 1985-11-18 | 1985-11-18 | Bringing about a temporary load-bearing capability of concrete |
Publications (1)
Publication Number | Publication Date |
---|---|
DE3540894C1 true DE3540894C1 (en) | 1987-04-30 |
Family
ID=6286305
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19853540894 Expired DE3540894C1 (en) | 1985-11-18 | 1985-11-18 | Bringing about a temporary load-bearing capability of concrete |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE3540894C1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4132368A1 (en) * | 1990-10-01 | 1992-04-02 | Geodrill Bohr Gmbh | Landfill material with temporary water impermeability |
WO2006038018A1 (en) * | 2004-10-08 | 2006-04-13 | Electromagnetic Geoservices As | Controlled deterioration of non-reinforced concrete anchors |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2409216B2 (en) * | 1974-02-27 | 1978-11-30 | Portland-Zementwerke Heidelberg Ag, 6900 Heidelberg | Cement-bonded moldings with a reinforcement made of artificial mineral fibers that are not alkali-resistant |
-
1985
- 1985-11-18 DE DE19853540894 patent/DE3540894C1/en not_active Expired
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2409216B2 (en) * | 1974-02-27 | 1978-11-30 | Portland-Zementwerke Heidelberg Ag, 6900 Heidelberg | Cement-bonded moldings with a reinforcement made of artificial mineral fibers that are not alkali-resistant |
Non-Patent Citations (1)
Title |
---|
Wendehorst: Baustoffkunde, 1975, S. 311 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4132368A1 (en) * | 1990-10-01 | 1992-04-02 | Geodrill Bohr Gmbh | Landfill material with temporary water impermeability |
WO2006038018A1 (en) * | 2004-10-08 | 2006-04-13 | Electromagnetic Geoservices As | Controlled deterioration of non-reinforced concrete anchors |
US8075685B2 (en) | 2004-10-08 | 2011-12-13 | Electromagnetic Geoservices As | Controlled deterioration of non-reinforced concrete anchors |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8100 | Publication of the examined application without publication of unexamined application | ||
D1 | Grant (no unexamined application published) patent law 81 | ||
8363 | Opposition against the patent | ||
8365 | Fully valid after opposition proceedings | ||
8339 | Ceased/non-payment of the annual fee |