BRIAN HOBBS and STUART J WRIGHT University of Sheffield

This paper reports on a research programme aimed at assessing the possibility of using ultrasonic pulse velocity testing techniques for the evaluation of both new and existing masonry structures. A brief review of previous work is given and a new approach to the application of this technique is described. Tests on individual bricks and blocks, mortar cubes and masonry specimens are described. The technique proved capable of differentiating between different types of brick and different mortar grades at ages ranging from 1 to 28 days. It was also capable of differentiating between “perfect” specimens and those containing various simulated construction defects. It is concluded that there is considerable potential for the further development of these techniques to provide a tool for quality control of new masonry construction and for the assessment of existing structures.