ABSTRACT
It is often necessary to test concrete structures after the concrete has hardened to determine whether the structure is suitable for its intended purposes. The quality of concrete is mainly judged by its compressive strength directly affecting the load-bearing capacity and durability of concrete structures, but the compressive strength test is destructive and causes damage to the concrete therefore concrete testing is a challenging problem. Many engineers, who are concerned when they
1 INTRODUCTION
For several decades, concrete has been the dominant construction material for most construction projects. The reason for the popularity of concrete can be mainly summarized in its superior technical properties, economy, availability of its raw materials and manufacturing simplicity compared to other more complicated competitive construction materials. Concrete is also characterized by the variability in properties of its ingredients which has a major influence on its properties in general. Therefore, the selection of concrete-making materials and the uniformity of such raw materials have a great impact on concrete quality. Moreover, the
want to measure the quality and strength of a building because strength testing is destructive, are turning to non-destructive testing techniques.
