Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
On concrete restrained eccentric ring and squared eccentric ring shrinkage test methods
Highlights Two improvements based on concrete restrained shrinkage ring test. The inner ring in mold geometry is now placed eccentrically. Stress concentration is induced by the eccentricity in mold geometry. Cracking location is predictable. Cracking time is noticeably shortened.
Abstract In the conventional restrained ring test method (RRTM) for evaluating restrained concrete shrinkage, the specimen geometry is a concentric ring, which causes cracking initiation anywhere in the ring randomly and it is inconvenient to observe. Aiming at improving the identification of cracking location, this article presents two improvements based on RRTM, namely the restrained eccentric ring test method (RERTM) and the restrained squared eccentric ring test method (RSERTM), in which the specimen geometry is a non-concentric ring for the former and a square with a non-concentric hole inside for the latter. In other words, in comparison with RRTM, the specimen geometry in RERTM and RSERTM now is featured with the inner ring being placed eccentrically. Numerical simulation was performed to guide the selection of specimen dimensions and to reveal the stress concentration phenomenon. Experiments were conducted to record cracking time and cracking locations. It is seen that, compared with RRTM, the eccentricity introduced in RERTM and RSERTM will give rise to stress concentration, guide cracking location, and noticeably shorten cracking time.
On concrete restrained eccentric ring and squared eccentric ring shrinkage test methods
Highlights Two improvements based on concrete restrained shrinkage ring test. The inner ring in mold geometry is now placed eccentrically. Stress concentration is induced by the eccentricity in mold geometry. Cracking location is predictable. Cracking time is noticeably shortened.
Abstract In the conventional restrained ring test method (RRTM) for evaluating restrained concrete shrinkage, the specimen geometry is a concentric ring, which causes cracking initiation anywhere in the ring randomly and it is inconvenient to observe. Aiming at improving the identification of cracking location, this article presents two improvements based on RRTM, namely the restrained eccentric ring test method (RERTM) and the restrained squared eccentric ring test method (RSERTM), in which the specimen geometry is a non-concentric ring for the former and a square with a non-concentric hole inside for the latter. In other words, in comparison with RRTM, the specimen geometry in RERTM and RSERTM now is featured with the inner ring being placed eccentrically. Numerical simulation was performed to guide the selection of specimen dimensions and to reveal the stress concentration phenomenon. Experiments were conducted to record cracking time and cracking locations. It is seen that, compared with RRTM, the eccentricity introduced in RERTM and RSERTM will give rise to stress concentration, guide cracking location, and noticeably shorten cracking time.
On concrete restrained eccentric ring and squared eccentric ring shrinkage test methods
Zhu, Han (Autor:in) / Li, Hao-ran (Autor:in) / Zhu, Xue-chao (Autor:in)
Construction and Building Materials ; 84 ; 239-244
28.02.2015
6 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
On concrete restrained eccentric ring and squared eccentric ring shrinkage test methods
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