The standard test used to characterize the performance of a fiber-reinforced sprayed concrete is the round or square panel test. Steel and macro synthetic fibers with different physical properties are commonly used as reinforcement. The test panel is usually prepared by spraying shotcrete into a steel mold and, after curing, performing a three-point bending test. The difficulty of this kind of preparation is to know where the fibers are located and how many have remained in the sample. There are plenty of factors affecting the fiber distribution, such as the type of shotcrete, wet or dry mix preparation and application techniques and skills. Also important is the setting time, which impacts the rebound of the fibers and the fiber content. The fibers are randomly oriented in the test specimen, as there is a three-dimensional structure and any one fiber can be oriented in any direction.
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