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Experimental study of effects of water-cement ratio on the acoustic emission rate “a” values in concrete

  • Acoustic Methods
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Abstract

The critical microcracks make durability of the concrete seriously weakened, and the water-cement (w/c) ratio plays a key role in the durability of concrete, acoustic emission (AE) rate “a” value is an effective parameter to evaluate the amount of critical microcracks quantitatively, so the study on the influence factors and the distribution of w/c ratio on the value “a” can provide a promising reference value for the practical engineering. A total of 90 specimens in different w/c ratio are tested under axial compression in the experiment. The whole damage evolution processes are monitored by fulldigital AE acquisition system. The differences of the amount of critical microcracks in different w/c ratio are explored based on the AE rate process theory, and the rule of the effects of w/c ratio on the rate “a” value is revealed through the analysis of fracture energy and cumulative AE energy in the failure process. The results show that a linear relationship was observed between cumulative AE energy and rate “a” value, the amount of critical microcracks and the rate “a” value increase with the increase of w/c ratio, while the cumulative AE energy and cumulative AE hits are on the contrary.

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Authors and Affiliations

  1. College of Civil and Transportation Engineering, Hohai University, Nanjing, 210098, China

    Y. Wang, N. Wang, C. Yan & L. Zhou

  2. CRRC CONSTRUCTION ENGRG.CO., LTD., Beijing, 100078, China

    H. X. Hu

  3. Shenzhen Municipal Design&Research Institude Co., Ltd., Shenzhen, 518029, China

    S. J. Chen

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  1. Y. Wang
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  2. H. X. Hu
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  3. N. Wang
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Correspondence to Y. Wang.

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Wang, Y., Hu, H.X., Wang, N. et al. Experimental study of effects of water-cement ratio on the acoustic emission rate “a” values in concrete. Russ J Nondestruct Test 53, 620–635 (2017). https://doi.org/10.1134/S1061830917090091

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  • DOI: https://doi.org/10.1134/S1061830917090091

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