Testing Historic Structures

July 20, 2016 – Elizabeth Manning, a member of MBJ’s preservation engineering team, has written a scholarly article, appearing in the September issue of the Journal of Nondestructive Evaluation. The article, entitled “Tube-Jack Testing for Irregular Masonry Walls: Regular Masonry Wall Testing,” is currently available to read online. Elizabeth is a PhD candidate in the historic preservation engineering program at the University of Minho in Portugal. See paper abstract, below.

ABSTRACT: This paper presents the continued development of a novel non-destructive testing method termed tube-jack testing. The goal of the tube-jack system is to provide an enhanced and less destructive method than traditional flat-jack testing for determination of mechanical characteristics and local stress states in irregular masonry walls. Single tube-jack tests were performed, using previously developed rubber tube-jacks, in regular masonry walls of granite and cement-lime mortar. A traditional flat-jack test was also performed in the same masonry wall. Conclusions suggest that tube-jacks are successful in applying pressure to the masonry at low stress states.