Masonry Magazine January 1968 Page. 47
Conduct Bearing Wall Seminar
The Mason Contractors Association of Western Michigan held a dinner and seminar on Load Bearing Masonry at The Elks Country Club on Tuesday evening December 5, 1967. The guest speaker was John C. Grogan P.E. Assistant Chief Engineer of Structural Clay Products Institute, Washington, D.C. Mr. Grogan showed slides and lectured on loading bearing masonry in high rise buildings. The guest included the area's leading Architects, City and State building officials in the area. About 100 people were present at the dinner and seminar. The Chairman of the program was Al Hazewinkel. The Western Michigan membership includes: Wm. Armstrong Masonry: Hazewinkel Bros.: Denhof & Feikema; Thomas E. Hogan Co., and VanDaalen & Bomhof Inc.
Implanted defects inside a special test wall panel constructed to represent a type of masonry wall commonly found in California school buildings reveal themselves to ultrasonic investigation. Research engineers at Aerojet-General Corporation in Sacramento, California, are shown above using both a special design signal processing circuit and standard laboratory equipment to conduct a through-transmission inspection of the concrete wall which contains intentionally implanted flaws. Position of flaws are charted by determining the delay and attenuation characteristics of the ultrasonic signal as it passes through the wall. The current sampling practice not only causes damage to the parent wall but does not necessarily determine the exact location of imperfections, is not directly repeatable and requires the wall to be replaced with the repair scars usually permanently visible. This is a pensive and time-consuming practice of testing the structural quality of masonry walls by removing samples (cores) from the completed wall and subjecting these to visual inspection and standard and physical tests.
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masonry • January, 1968
47