Abstract
The fatigue strength of concrete is lower than its static strength. An attempt was made to accelerate the destabilisation process due to microcracking by the application of fatigue loads. The aim of this was to get ready access to information about concrete's sustained loading strength. The fatigue strength of autoclaved aerated concrete (AAC) was observed by applying cyclic loads to unreinforced cylinders. AAC was found to be less sensitive to fatigue loads than lightweight concrete. The fatigue tests were supplemented by tests using sustained loads. It could be assumed that the behaviour under both static and fatigue loads was comparable with that of lightweight and normal concrete. A substantial influence of load duration was found, especially at high load levels.
Highlights
Sustained loads lead to the destabilisation and failure of concrete at lower load levels than short term loads
No clear data exist with regard to the sustained loading strength for autoclaved aerated concrete (AAC)
In order to be able to make clear statements at short notice about the sustained loading strength of AAC, it was necessary to find a way of accellerating the damage mechanisms
Summary
Sustained loads lead to the destabilisation and failure of concrete at lower load levels than short term loads. No clear data exist with regard to the sustained loading strength for autoclaved aerated concrete (AAC). It is known that cyclic loads can lead to failure at lower levels than sustained loads. From a physical point of view, correlations exist between fatigue and sustained loads. This consideration represents the basis for the fatigue tests conducted on autoclaved aerated concrete. The behaviour of AAC under sustained loads was compared with its fatigue behaviour
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