Recently, the ASTM committee changed the F1869 Calcium Chloride standard to specifically disallow Calcium Chloride testing for all lightweight aggregate concrete.
far back as the 1940s, Calcium Chloride testing has been used to determine the
suitable moisture content of poured concrete slabs when applying resilient
floor coverings. The standard for performing the Calcium Chloride test has seen
many changes over the years but both the science supporting Calcium Chloride as
a test method and the reliability of the test method have remained problematic.
Findings of recent studies have proven the ASTM-F1869 Calcium Chloride standard
is no longer an acceptable test method for lightweight concrete.
ASTM-F2170 In-Situ Relative Humidity testing has been replacing Calcium
Chloride as the preferred method for concrete moisture determination. Not only
are RH results more consistently reliable, RH testing has also proven to be
cost efficient, user friendly and more appropriate to the resilient floor
covering industry. Understanding the changes and the science behind RH testing
and ASTM-F2170 will help installers, developers and contractors specify the
testing method best suited to give reliable, actionable results for the
resilient flooring industry.
To get your
copy of ASTM-F1869-10, visit
ASTM changes moisture testing standard
October 13, 2010