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Microcracking and Fracture Process in Cement Mortar and Concrete: A Comparative Study Using Acoustic Emission Technique

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Abstract

This article reports the acoustic emission (AE) study of precursory micro-cracking activity and fracture behaviour of quasi-brittle materials such as concrete and cement mortar. In the present study, notched three-point bend specimens (TPB) were tested under crack mouth opening displacement (CMOD) control at a rate of 0.0004 mm/sec and the accompanying AE were recorded using a 8 channel AE monitoring system. The various AE statistical parameters including AE event rate \( \left( {\frac{dn }{dt }} \right) \), AE energy release rate \( \left( {\frac{dE }{dt }} \right) \), amplitude distribution for computing the AE based b-value, cumulative energy (ΣE) and ring down count (RDC) were used for the analysis. The results show that the micro-cracks initiated and grew at an early stage in mortar in the pre peak regime. While in the case of concrete, the micro-crack growth occurred during the peak load regime. However, both concrete and mortar showed three distinct stages of micro-cracking activity, namely initiation, stable growth and nucleation prior to the final failure. The AE statistical behavior of each individual stage is dependent on the number and size distribution of micro-cracks. The results obtained in the laboratory are useful to understand the various stages of micro-cracking activity during the fracture process in quasi-brittle materials such as concrete & mortar and extend them for field applications.

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Authors and Affiliations

  1. Department of Civil Engineering, Indian Institute of Science, Bangalore, 560 012, India

    R. Vidya Sagar & R. V. Prasad

  2. Center for Campus Maintenance and Development, Indian Institute of Science, Bangalore, 560 012, India

    B. K. Raghu Prasad

  3. NGRI, Uppal, Hyderabad, 500 606, India

    M. V. M. S. Rao

Authors
  1. R. Vidya Sagar
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  2. R. V. Prasad
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  3. B. K. Raghu Prasad
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  4. M. V. M. S. Rao
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Correspondence to R. Vidya Sagar.

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Vidya Sagar, R., Prasad, R.V., Raghu Prasad, B.K. et al. Microcracking and Fracture Process in Cement Mortar and Concrete: A Comparative Study Using Acoustic Emission Technique. Exp Mech 53, 1161–1175 (2013). https://doi.org/10.1007/s11340-012-9708-z

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  • DOI: https://doi.org/10.1007/s11340-012-9708-z

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