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Advertising supplement provided by
Portland Cement Association
by Jennifer Grover Prokopy
ASTM C780: Standard Test Method for
Preconstruction and Construction Evaluation of Mortars for
Plain and Reinforced Unit Masonry
A second standard that architects and other specifiers should
be familiar with is ASTM C780, Standard Test Method for Preconstruction
and Construction Evaluation of Mortars for Plain and Reinforced
Unit Masonry. The standard provides test methods to ensure
that the field mortar meets the recipe that was either selected
from ASTM C270 proportion specifications, or determined in
the laboratory to conform with ASTM C270 property specifications.
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Contrary to popular belief,
mortar cube test results do not equal in-place mortar
strengths. |
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Preconstruction evaluation of mortars establishes expected
test values for site-produced mortars. Construction-site testing
for QC provides a means of evaluating the mortar’s conformance
with specified proportions or proportions established by laboratory
property specifications. When construction-site testing is
desired, specifiers should use ASTM C780.
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