Using Nondestructive Test for In-situ Strength Evaluation of Concrete Masonry Units
Conference: Publication Date: 16 March 2015
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.
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