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Abstract:

Fibre efficiency in structural elements can be improved by controlling and influencing the final direction of the fibres in order to attain the same post-cracking behaviour with a smaller fibre content. This optimisation will be investigated by experiments. Besides a computational model will be developed to simulate the flow of fresh concrete in a given formwork and to predict the fibre alignment during the flow of SFRSCC. The results presented in this paper examine the influence of fibre length and flow distance on the fibre orientation and are part of an ongoing experimental programme. Fibre orientation and distribution are determined by manually counting the pulled out fibres in both cracking planes. The post-cracking behaviour is determined from the load-CMOD curve obtained by testing notched prisms, cut from longer beams, under three-point loading (EN 14651).