Abstract
A declined table test is proposed to determine the fresh properties of mortar and concrete. Different from the conventional slump test that is conducted on the flat table, a flow angle of fresh mortar or concrete will appear through the slump test on the declined table. This study investigates the relationships between the fresh properties tested by the conventional slump test and the flow angles on the declined table, with reference to the visual stability index specified in the ASTM C1611 and density distribution method based on the conventional slump test, the feasibility of the declined table method to evaluate the dynamic segregation of fresh concrete is verified. The results indicate that the mortar and concrete with higher fluidity have larger flow angles on the declined table, but the mortar with an unstable state shows an increased trend in the flow angle. The concrete generally has a lower flow angle than the affinal mortar. The ratio of the flow angle of mortar (Am) to the flow angle of concrete (Ac) is feasible to evaluate the dynamic segregation extent of fresh concrete, and a higher Am/Ac value means a severer dynamic segregation tendency. Using a reasonable classification of Am/Ac, the declined table test is feasible to determine whether the fresh concrete is stable or not.
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Acknowledgements
This work was supported by Natural Science Foundation of Henan Province, Key R&D and Promotion Project of Henan Province (222102320362), the Science and Technology Development Project of Henan Province (152102210053) and the Science and Technology Open Cooperation Project of Henan Academy of Sciences in 2021 (210909015).
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Xu, G., Wu, H., Cai, J. et al. Dynamic stability evaluation of fresh concrete with the declined table test. Mater Struct 57, 5 (2024). https://doi.org/10.1617/s11527-023-02273-y
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DOI: https://doi.org/10.1617/s11527-023-02273-y