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Pro109-2

ON UTILISATION OF ELLIPTICAL RINGS FOR ASSESSING CRACKING TENDENCY OF CONCRETE AND OTHER CEMENT- BASED MATERIALS



Author(s): Xiangming Zhou, Wei Dong, Gediminas Kastiukas
Paper category: Proceedings
Book title: proceedings of the International RILEM Conference on Materials, Systems and Structures in Civil Engineering Conference segment on Service Life of Cement-Based Materials and Structures
Editor(s): Miguel Azenha, Ivan Gabrijel, Dirk Schlicke, Terje Kanstad and Ole Mejlhede Jensen
ISBN:978-2-35158-171-4
e-ISBN: 978-2-35158-173-5
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 685-694
Total Pages: 10
Language : English


Abstract: A new method, based on elliptical rings, was explored for assessing cracking tendency of
concrete and other cement-based materials under restrained condition. The new elliptical ring
test method was developed by mapping the circular ring tests recommended by AASHTO and
ASTM. A series of thin and thick elliptical concrete rings were tested alongside circular ones.
Cracking age and position of circular and elliptical rings were examined. It is found that thin
elliptical rings with appropriate geometry can initiate crack quicker than circular ones which
is desirable for accelerating the ring test. However, thick elliptical rings seem not to exhibit a
desirable geometry effect of accelerating ring test. Besides, it was found that crack initiated
from the inner circumferential surface and propagated toward the outer surface in thin rings.
In comparison, in thick rings, crack initiated from the outer circumferential surface and
propagated to the inner surface. There were multiple cracks that occurred in elliptical rings
and some cracks initiated but did not propagate through the ring wall. In comparison, there
was only one crack in circular rings. Finally, the features of multiple cracks in restrained
elliptical rings were examined, and their impact on interpreting elliptical ring test results was
elaborated.


Online publication : 2016
Publication type : full_text
Public price (Euros) : 0.00


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