Weekly Poll (4)


The United States Geological Survey released last month its first map of where the mineral pyrrhotite could occur in the nation. Pyrrhotite is a mineral that consists of iron and sulfur. When exposed to water and air, it can break down to form secondary minerals that expand and crack concrete, causing concrete structures to fail. Do you think the map will benefit future residential construction efforts?


Recycled concrete is often used in nonstructural applications like highways and sidewalks. Do you think it is likely to find a place in buildings and bridges?


It seems that bridge failures have been making the headlines more frequently, and many U.S. bridges are nearing or exceeding their life expectancy. Do you think most bridges are safe?


D+D sometimes publishes articles on non-film forming sealers for concrete and masonry substrates, both in this newsletter and in print. Do you deal with these sealers?


 
 
   

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