Source of Corrosion
Bacterial Activity is Source of Corrosion
Is Proven Scientifically
Even today, more than 70 years after the 1945 discovery of Microbial Induced Corrosion (MIC) by C.D. Parker, concrete corrosion in sanitary sewers is still commonly referred to as a sulfide (H2S) gas problem.
The primary problem for concrete in the sewer environment is Thiobacillus thiooxidans (concretivorous) - Latin for “concrete-eating”.
National Association of Corrosion Engineers (NACE) lists Thiobacillus as the most common sulfur-oxidizing bacteria.
Thiobacillus is the most common sulfur-oxidizing bacteria. Thiobacillus bacteria oxidize sulfur and sulfide gas to produce sulfuric acid which quickly dissolves concrete. Corrosion is caused by the sulfuric acid.
NACE TPC Publication 3, September, 1990 Pages 22 and 23.
Double Blind Clinical Testing Program
CONmicSHIELD® treated concrete has been vigorously tested at independent labs since 1997. These ongoing tests continue to validate the long term effectiveness of the product. “The testing protocol which closely follows ASTM D-4783 requires unidentified treated and non-treated specimens to be inoculated with live bacteria and incubated at 25 degrees Celsius. With each repeated test, within just 24 hours there was a 99.9% reduction of bacteria." Dr. Clarence Baugh, Custom Biological Laboratories.
CONmicSHIELD® is not a new product. It has been successfully used in North America for rehabilitation of severely deteriorated manholes, lift stations, pipe and for new concrete pipe and manholes since its introduction in 1996. “There is simply no easier or less expensive way to provide a 100 year design life against MIC”.
References, case studies, specifications and test reports are available upon request.