It does not create a brine like rock salt, but keeps the snow lighter and drier improving traction. If applied early in the storm, CMA prevents the formation of snow pack and the bonding of ice to the pavement surface, so snow and ice can be removed more easily. Because CMA does not produce a running brine, it does not move off the surface like other deicers. Therefore, fewer applications are needed during a storm and from storm to storm.
Experience has shown that surfaces treated with CMA often exhibit anti-icing properties during subsequent periods of freezing moisture. Calcium Magnesium Acetate CMA is best used as a deicer, spread on the pavement after precipitation starts.
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CMA is applied at rates similar to road salt, but heavier in the first application and lighter as the storm continues. Typical application rates:. CMA has been used successfully since by snow fighters worldwide.
It is effective over a similar temperature range as road salt: performance decreases below 20 degrees F -7 degrees C. Effectiveness is generally enhanced by traffic, sunlight, and warmer temperatures.
Because CMA is acetate-based instead of chloride-based, it has unique performance characteristics. Over the years many techniques have been tested and adopted to increase its efficiency. When mixed with snow, CMA interferes with the ability of snow particles to adhere to each other or to the surface. It does not create a flowing brine like salt, but keeps the snow lighter and drier improving traction. Applied early in the storm, CMA prevents the formation of snow pack and the bonding of ice to the pavement surface, so snow and ice can be removed more easily by plow, broom or shovel.
Because CMA does not produce a running brine, it does not move off the surface like other deicers. Therefore, fewer applications are needed during a storm and from storm to storm.
Experience has shown that surfaces treated with CMA often exhibit anti-icing properties during subsequent periods of freezing moisture. Early application is the key to effective performance of all deicers, including CMA. At the beginning of a snow event, a heavier application of CMA may be appropriate depending on local conditions. Snow plows and the action of traffic will remove the snow — leaving a residual layer of CMA. Application rates may be decreased as the storm continues.
CMA exhibits very low corrosion rates on metals found in bridges, roadways, parking garages, and other steel and concrete systems. Commonly described as being about as corrosive as tap water, CMA is often used as the corrosion standard by which other deicers are judged. FHWA, U. K Department of Transport, and other independent institutions have concluded: CMA is a proven low corrosion deicer.
A switch to CMA on chloride-contaminated concrete structures may extend their useful life. Tests by the Denmark Ministry of Transport with steel rebar in chloride-contaminated concrete showed that when samples were treated with CMA solutions, corrosion rates were reduced.
A number of laboratory tests suggest that CMA may be an effective corrosion inhibitor when combined with salt. As expected, the best corrosion protection results from the use of pure CMA. Many engineers specify CMA because it does not chemically attack concrete nor does it increase spalling caused by the freeze-thaw cycling of water.
Testing by Michigan DOT confirmed that CMA dramatically reduced spalling in both air-entrained and non air-entrained concrete compared to salt alone. Not only that, but this substance works fast. Really fast. Calcium Chloride can melt twice as much ice and snow as rock salt. Calcium Chloride is used so widely because of its ability to melt ice and snow at lower temperatures. That means it can be corrosive and has a caustic effect on the pavement, but the fact that less of it is needed to melt ice means it causes less damage than rock salt does.
This substance is also slightly more expensive than CMA and rock salt, making it great for mixing with these other deicing agents. It depends on your situation!
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