MCI¨ competitor DCI (calcium
nitrite) has begun to corrode in an ongoing ASTM: G109 test between
Cortec¨ MCI-2005, MCI-2006 and other competitors. At a dosage of
four gallons per yard, the intital corrosion rate of DCI is 20 percent
greater than the initial rate of the control. American Engineering
Testing, St. Paul, Minnesota, found the DCI samples started to corrode
in the forty-third test cycle. They are expected to surpass the
MCI-2006 samples for the total charge passed in the sixty-second
cycle of testing.
The ASTM: G109 test is
a standard test that determines the effects of chemical admixtures
on steel reinforcements embedded in concrete in chloride environments.
Each cycle runs about a month, with two weeks wet and two weeks
dry. See the enclosed report for detailed information.