DE102004002635A1 - Shrinkage tension measuring device for measuring tensions in building materials has an inflexible sample carrier held by fixed supports so that the torque arising from a shrinking applied sample is transferred to a load cell - Google Patents
Shrinkage tension measuring device for measuring tensions in building materials has an inflexible sample carrier held by fixed supports so that the torque arising from a shrinking applied sample is transferred to a load cell Download PDFInfo
- Publication number
- DE102004002635A1 DE102004002635A1 DE200410002635 DE102004002635A DE102004002635A1 DE 102004002635 A1 DE102004002635 A1 DE 102004002635A1 DE 200410002635 DE200410002635 DE 200410002635 DE 102004002635 A DE102004002635 A DE 102004002635A DE 102004002635 A1 DE102004002635 A1 DE 102004002635A1
- Authority
- DE
- Germany
- Prior art keywords
- sample
- sample carrier
- supports
- load cell
- building material
- 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
Links
- 239000004566 building material Substances 0.000 title claims abstract description 12
- 239000000463 material Substances 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 5
- 238000005452 bending Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 2
- 239000000853 adhesive Substances 0.000 claims 1
- 230000001070 adhesive effect Effects 0.000 claims 1
- 239000000969 carrier Substances 0.000 claims 1
- 239000012876 carrier material Substances 0.000 claims 1
- 238000001035 drying Methods 0.000 abstract 1
- 239000004567 concrete Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000011505 plaster Substances 0.000 description 1
- 238000004382 potting Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- -1 screed Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; ceramics; glass; bricks
- G01N33/383—Concrete, cement
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0023—Bending
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0092—Visco-elasticity, solidification, curing, cross-linking degree, vulcanisation or strength properties of semi-solid materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
Abstract
Description
Baustoffe, wie Beton, Putz, Estrich, Kleber, Spachtelmassen oder Vergussmassen ändern ihr Volumen, dementsprechend auch ihre Länge über die Zeit (siehe z.B. Scholz, W., Baustoffkenntnis, 11. Auflage, Düsseldorf 1987, Seite 258 ff.). Wird diese Längenänderung durch Verbund mit anderen Bauteilen oder durch Bewehrung behindert, ergibt sich im Baustoff eine Spannung. Übersteigt die Spannung die Zug- oder Druckfestigkeit des Materials, kommt es zur Rissbildung, also zu einer Zerstörung des Werkstoffs.building materials, like concrete, plaster, screed, glue, fillers or potting compounds change their volume, accordingly, their length over the Time (see, for example, Scholz, W., Baustoffkenntnis, 11th edition, Dusseldorf 1987, page 258 ff.). Will this change in length by bonding with others Components or impeded by reinforcement, results in the building material a tension. exceeds the tension is the tensile or compressive strength of the material, it comes Cracking, so to destruction of the material.
Die
gebräuchlichsten
Vorrichtungen, um Schwind- oder Dehnvorgänge von Baustoffen zu erfassen,
sind Schwindrinnen (z.B
Prüfvorrichtungen
für das
behinderte Schwinden balkenförmiger
massiver Bauteile sind in der Literatur beschrieben (R. Springenschmid
und P. Niesler Beton- und Stahlbetonbau 68, 1973, Heft 9, Seiten
221-226; oder E.Tazawa und K. Iida, Transaction of the Japan Concrete
Insitute, Vol. 5, Seiten 119-126; oder
Weiter bekannt ist eine Anordnung zum Prüfen ringförmiger Proben (V. Lamour, A. Haouas, M. Moranville, J. Lebourgeois, Cerem Journal, Januar 2003). Damit sind Messungen auch während des Abbindens möglich, allerdings nicht in dünnen Schichten und nicht im Verbund mit anderen Materialien.Further A device for testing annular samples is known (V. Lamour, A. Haouas, M. Moranville, J. Lebourgeois, Cerem Journal, January 2003). Thus measurements are also during of bonding possible, but not thin Layers and not in combination with other materials.
Die im Patentanspruch 1 angegebene Erfindung erlaubt es, die in dünnen Schichten beim behinderten Schwinden oder Dehnen auftretenden Kräfte und Spannungen mit einer technisch einfachen Vorrichtung zu erfassen. Die oben beschriebenen Nachteile der bisherigen Konstruktionsprinzipien werden durch die Erfindung vermieden.The in claim 1 invention allows it, in thin layers in the disabled shrinkage or stretching forces and To detect voltages with a technically simple device. The above-described disadvantages of the previous design principles are avoided by the invention.
Wie
in
Die Auflager sind so ausgeführt, dass sie ein Durchbiegen des Probenträgers senkrecht zu einer gedachten Verbindungslinie zwischen den Auflagern nicht behindern.The Supports are designed that they are a bending of the slide perpendicular to an imaginary Do not obstruct the connection line between the supports.
Zwischen
diesen Auflagern stützt
sich der Probenträger
mit der Probe auf einer wegkompensierten Kraftmessdose (
Zu Beginn der Messung wird die Kraftmessdose tariert. Das durch die Schwind- oder Dehnvorgänge hervorgerufene Biegemoment verursacht Kräfte in den Auflagern. Die Gegenkraft wird durch die dazwischen angeordnete Kraftmessdose in bestimmten zeitlichen Abständen erfasst.To At the beginning of the measurement, the load cell is tared. That by the Shrinking or stretching processes caused bending moment causes forces in the supports. The drag is determined by the interposed load cell in certain time intervals detected.
Durch die Verwendung einer kompensierten Kraftmessdose tritt keine bleibende Verformung auf, da diese stets auf die Anfangsposition zurückregelt. Die Verformung des Probenträgers in Längsrichtung kann bei geeigneter Dimensionierung vernachlässigt werden.By the use of a compensated load cell does not occur permanently Deformation, as this always back to the initial position. The Deformation of the sample carrier in the longitudinal direction can neglected with suitable dimensioning.
Eine
unerwünschte
Durchbiegung des Probenträgers
kann mit Dehnungssensoren (
Wie oben beschrieben, ist die Erfindung voll funktionsfähig. Der Vorteil liegt darin, dass das Messen von Schwind- und Dehnspannungen während des Abbindens, ab dem Zeitpunkt der Applikation der Probe auf den Probenträger möglich ist, so dass sehr dünne Schichten gemessen werden können. Ebenso erlaubt eine Variation der Probenträger und der Umweltbedingungen, dass auch der Einfluss der Wechselwirkung zwischen Probe, Untergrund und Klima untersucht werden kann. Sind die Schwind- oder Dehnspannungen bekannt, so kann durch eine Rezepturänderung der Baustoff gezielt in seiner Festigkeit und seinem Schwinden beeinflusst werden, und so die Schädigung durch Rissbildung minimiert werden.As described above, the invention is fully functional. The advantage is that the measurement of shrinkage and expansion stresses during setting, from the time of application of the sample on the sample carrier is possible, so that very thin layers can be measured. Likewise allows a variation of the sample carrier and the Um that the influence of the interaction between the sample, the subsurface and the climate can also be investigated. If the shrinkage or expansion stresses are known, the composition of the building material can be specifically influenced in terms of its strength and shrinkage by a formulation change, thus minimizing the damage caused by cracking.
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004002635.1A DE102004002635B4 (en) | 2004-01-19 | 2004-01-19 | Device for detecting material tensions in the case of impeded stretching and shrinkage of building materials |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004002635.1A DE102004002635B4 (en) | 2004-01-19 | 2004-01-19 | Device for detecting material tensions in the case of impeded stretching and shrinkage of building materials |
Publications (2)
Publication Number | Publication Date |
---|---|
DE102004002635A1 true DE102004002635A1 (en) | 2005-08-04 |
DE102004002635B4 DE102004002635B4 (en) | 2015-10-15 |
Family
ID=34716672
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE102004002635.1A Expired - Lifetime DE102004002635B4 (en) | 2004-01-19 | 2004-01-19 | Device for detecting material tensions in the case of impeded stretching and shrinkage of building materials |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE102004002635B4 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109100497A (en) * | 2018-07-30 | 2018-12-28 | 广东浪淘砂新型材料有限公司 | A kind of test method of Dry Shrinkage of Cement Mortar |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1194167B (en) * | 1961-09-08 | 1965-06-03 | Philips Nv | Weighing device |
CH593481A5 (en) * | 1975-11-18 | 1977-12-15 | Mettler Instrumente Ag | |
US4369653A (en) * | 1981-04-06 | 1983-01-25 | E. I. Du Pont De Nemours And Company | Shrinkage gauge and method |
DE3243350C2 (en) * | 1982-11-24 | 1986-06-19 | Sauer, Kuno | Weight recording system with electromagnetic load compensation |
KR20010103232A (en) * | 2000-05-08 | 2001-11-23 | 윤덕용 | Measurement Apparatus for Thermal Stresses of Concrete Structures and Method Thereof |
DE10046284B4 (en) * | 2000-09-19 | 2011-12-22 | Markus Greim | Device for detecting the early expansion and shrinkage behavior of building materials |
-
2004
- 2004-01-19 DE DE102004002635.1A patent/DE102004002635B4/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109100497A (en) * | 2018-07-30 | 2018-12-28 | 广东浪淘砂新型材料有限公司 | A kind of test method of Dry Shrinkage of Cement Mortar |
CN109100497B (en) * | 2018-07-30 | 2020-12-01 | 广东浪淘砂新型材料有限公司 | Method for testing drying shrinkage performance of cement mortar |
Also Published As
Publication number | Publication date |
---|---|
DE102004002635B4 (en) | 2015-10-15 |
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8110 | Request for examination paragraph 44 | ||
R016 | Response to examination communication | ||
R018 | Grant decision by examination section/examining division | ||
R020 | Patent grant now final | ||
R071 | Expiry of right |