NON-DESTRUCTIVE TESTS FOR EVALUATION OF A CONCRETE TUNNEL STRUCTURES

Abstract

The standard method of evaluating the quality of concrete in buildings or Tunnel structures is to test specimens cast simultaneously for compressive, flexural and tensile strengths. The main disadvantages are that results are not obtained immediately. Although there can be no direct measurement of the strength properties of structural concrete for the simple reason that strength determination involves destructive stresses, several non- destructive methods of assessment have been developed. These depend on the fact that certain physical properties of concrete can be related to strength and can be measured by non-destructive methods. These non-destructive methods may be categorized as penetration tests, rebound tests, pull-out techniques, dynamic tests, radioactive tests, maturity concept. To evaluate the quantity and quality of concrete using in Tunnel lining before and duration of operating the Tunnel is inevitable.