Using Nondestructive Test for In-situ Strength Evaluation of Concrete Masonry Units

Concrete masonry units (CMUs) are rapidly replacing the burnt clay bricks in the construction industry, especially in the southern regions of Asia. The factories fabricating CMUs sometimes lack effective quality control for the fabricated units, and rely on destructive tests, such as described by ASTM C140, to demonstrate compliance with compressive strength criteria. Such destructive testing is expensive and is, therefore, performed on a limited basis. In the past, some nondestructive testing techniques have proven to be efficient in evaluating strength or locating anomalies in concrete. This research investigates the prospects of using rebound hammer and ultrasonic pulse velocity tests for evaluating the compressive strength of concrete specimens made with materials, mixture proportions and compaction similar to that of CMUs. The statistical models show that these nondestructive testing techniques are not equally reliable and it is recommended that pulse velocity can be a useful tool for in-situ strength evaluation of CMUs.

References
  1. ASTM C140, “Standard Test Methods for Sampling and Testing Concrete Masonry Units and Related Units,” ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
  2. ASTM C 39/39M, “Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens,” ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
  3. ASTM C 597, “Standard Test Method for Pulse Velocity Through Concrete,” ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States
  4. ASTM C 805, “Standard Test Method for Rebound Number of Hardened Concrete,” ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
  5. Breysse, D., "Nondestructive Evaluation of Concrete Strength: An Historical Review and a New Perspective by Combining NDT Methods, Construction and Building Materials, 33 (2012), pp. 139-163.
  6. Hamidian, M., Ali S., M.M. Arabnejad K., Hamid S., Ali T. and Karim N., “Application of Schmidt Rebound Hammer and Ultrasonic Pulse Velocity Techniques for Structural Health Monitoring,” Scientific Research and Essays Vol. 7(21), pp. 1997-2001, 7 June, 2012.
  7. Lodi, S.H., J.S. Abdul, and A. Adam, “Concrete-Block Masonry Construction in Pakistan,” World Housing Encyclopedia by Earthquake Engineering Research Institute and International Association of Earthquake Engineering, 2012.
  8. Naeem, A., A. Qaisar, J. Muhammad, H. Zakir, N. Amjad, M.A. Syed, A.Irshad and A. Muhammad, “Learning from Earthquakes: First Report on Kashmir Earthquake of October 08, 2005,” Earthquake Engineering Research Institute (EERI) Special Earthquake Report December-2005.
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