Masonry Magazine June 1989 Page. 34
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Investigative Techniques
continued from page 33
in either direction from the -in. access hole," Mr. Ribar
explained.
Numerous randomly located voids were identified that
were required by project specifications to be filled solidly
with a portland cement grout. These voids ranged in size
from a %-in. cavity parallel to the face shell of a concrete
masonry unit (CMU) to an entire core cell 8 ft. high.
To repair the voids, trial batches of grout were prepared
incorporating a plasticizer and a small quantity of mason's
lime. A desirable slump was verified by pumping trial grout
mixes into mock specimens.
Once a mix was selected, the repair grout was con-
veyed to the walls by a pressure pump where it was in-
jected through 1-in. holes strategically located to assure
complete filling of the voids. For quality control, grout
prisms were cast and tested according to ASTM 1019-84.
"Sampling and Testing Grout."
Combining two precision investigative techniques with
expertise in materials technology, CTL was able to identify
and repair randomly located unfilled grout cavities in load-
bearing masonry walls.
This information first appeared in CTL Review, a quarterly news-
letter published by Construction Technology Laboratories, Inc.,
5420 Old Orchard Road, Skokie, IL 60077-1030. It is used with
permission.
Support Test Program AT U.D.
Suppliers in the Greater Dayton, Ohio, area have again
pitched in to assist the University of Dayton and its de-
veloping masonry curriculum. The Civil Engineering De-
partment needed a masonry test rig for graduate and un-
Suppliers who supported the program to secure a masonry test rig
for the University of Dayton present a check to Dr. Joseph Saliba
(right), Dept. of Civil Engineering, for the project. Pictured (1. to r.)
are: Bill Carroll, Dayton Builders Supply; Jack Mittlestadt, Wilson
Concrete Products: Ralph Renner, Synder Brick & Block: Paul Tropp.
Taggart Builders Supply; Dr. Fred Bogner, Head of Civil Engineering,
University of Dayton; Debra Hill Grines, Bryce Hill Supply: Dr. Gordon
Sargent, Dean of Engineering, University of Dayton and Dr. Saliba.
Not present were: Dave Weissman, Stone Centers of Ohio and Bob
Kosicki, Gem City Brick & Block.
dergraduate students in order that they might run tests on
masonry materials for compression, tension and shear. Over
90% of the masonry suppliers were eager to cooperate and
they collected the necessary funds for this to be accom-
plished.
Approximately three years ago, through the efforts of
the Masonry Institute of Dayton, a reinforced masonry
course was added to the University's curriculum-the first
masonry course to be taught at the school.
34 MASONRY-MAY/JUNE, 1989