• Adil Yousf

This paper reviews the most common non-destructive testing (NDT) methods of concrete structures as utilized by the structural engineering industry. The fundamentals of NDT methods are explored in regards to their potential, limitations, inspection techniques and interpretations. The factors that influence the success of NDT methods are discussed and the ways to mediate their influence are recommended. Reference is made to standard guidelines for the applications and interpretation of the discussed NDT methods. NDT of concrete was found to be gaining increasing acceptance as a means of evaluating the strength, uniformity, durability and other properties of existing concrete structures. Perceptions of NDT in adequacy were attributable to lack of understanding construction materials and NDT methods themselves. The intent of this paper is to address these concerns by identifying and describing the most common successful methods of NDT as applied to concrete structures. The concept of nondestructive testing (NDT) is to obtain material properties of in place specimens without the destruction of specimen nor the structure from which it is taken. However, one problem that has been prevalent within the concrete industry for years is that the true properties of an in-place specimen have never been tested without leaving a certain damage on the structure. For most cast-in-place concrete structures, construction specifications require that test cylinders be cast for 28-day strength determination. Usually, representative test specimens are cast from the same concrete mix as the structural elements. Unfortunately test specimen are not an exact representation of in-situ concrete, and may be affected by variations in specimen type, size and curing procedures. The use of the combined methods produces results that lie close to the true values when compared with other methods. The method can be extended to test existing structures by taking direct measurements on concrete elements.

Non-destructive testing, Overview of methods, ND methods in practice

"Comparison of Various Samples of Concrete Using Non-Destructive Testing: A Review of Methods", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 6, page no.417-420, June 2019, Available :http://www.jetir.org/papers/JETIR1906K49.pdf

"Comparison of Various Samples of Concrete Using Non-Destructive Testing: A Review of Methods", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 6, page no. pp417-420, June 2019, Available at : http://www.jetir.org/papers/JETIR1906K49.pdf