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Development of a relaxations test-frame
Luleå tekniska universitet.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
1994 (English)In: Nordic Concrete Research, ISSN 0800-6377, Vol. 15, p. 89-96Article in journal (Refereed) Published
Abstract [en]

This paper describes how relaxation tests on young concrete are performed at the Division of Structural Engineering at Luleá University of Technology. The development of a new test machine is presented and some results from pilot tests are given. The presented test method can be used to simulate different thermal stress conditions in the casting of massive concrete structures. This means that it may reduce the need for complicated and expensive full scale tests to ensure that no cracking takes place in newly cast concrete structures. A one meter long concrete beam is poured directly into a form in a steel frame. Temperated air is blown into a box containing the specimen and is circulated around it. In this way the specimen can be given a temperature development which is representative for a specific concrete structure. One of the short ends of the specimen is fixed in the steel frame and the other end is free to move in the longitudinal direction. The position of the free end of the specimen is kept within 0.2 µm from the initial position by a servo-hydraulic cylinder. In this way, nearly 100% restraint is obtained. The force acting on the cylinder is directly proportional to the stresses occurring in the concrete specimen.

Place, publisher, year, edition, pages
1994. Vol. 15, p. 89-96
National Category
Infrastructure Engineering
Research subject
Structural Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-6832Local ID: 523389f0-20e2-11dd-8447-000ea68e967bOAI: oai:DiVA.org:ltu-6832DiVA: diva2:979718
Note
Godkänd; 1994; 20080513 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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