||Test Method for Hydraulic Cement-Based Mortars and Plasters Available
as a Separate
ASTM C 1506, Standard Test Method for Water Retention of Hydraulic Cement-Based
Mortars and Plasters is now available as a stand alone test method
from ASTM International. It has been approved by ASTM Committee
C01 on Cement.
Used to test masonry and stucco work, Test Method C 1506 was taken
from ASTM C 91, Standard Specification for Masonry Cement, and slightly modified.
This is a good thing to do; rather than having the test method
embedded in the standard. Its easier to find, said committee
member Leslie J. Struble, Ph.D., associate professor, Department
of Civil and Environmental Engineering, University of Illinois
The main modification is that the procedure previously called
for a suction method using a water aspirator and a mercury manometer
and has been revised to use a vacuum gauge, which is safer than
mercury. It doesnt change what or how you measure; its just
safer, Struble said.
The mercury manometer method remains an alternate until all the
labs can convert to the vacuum gauge, said Peter Hawkins, the
chief author of C 1506 and a committee member with 49 years in
cement. But the vacuum gauge is the preferred method, he added.
The apparatus has been slightly modified to prevent water from
being sucked into the vacuum gauge or the manometer.
Hawkins related that ASTM C 1328, Standard Specification for Plastic (Stucco) Cement, and C 1329, Standard Specification for Mortar Cement, both reference C 91
for water retention, as well as having the method in C 91. Now
weve got a straight method, so C 91, 1328 and 1329 can simply
reference C 1506 for water retention, said Hawkins, a cement
consultant who retired from the California Portland Cement Co.
in July. The introduction of this test has enabled C 91 to conform
to ASTMs form and style.
For further technical information, contact Peter Hawkins, Fennville, Mich. (phone: 616/227-1641). Committee C01 meets
June 26-28 in Salt Lake City. For meeting or membership details,
contact Jim Olshefsky, ASTM technical committee manager (phone: 610/832-9714). //
Copyright 2002, ASTM