MN Concrete Forum: Near Surface Aggregate Reactivity & Petrography - What We Know

"Near Surface Aggreate Reactivity and Petrography - What We Know" will be presented by Gerard Moulzolf, P.G. (American Engineering Testing).  The concrete petrographer is often called upon to explain the causes of deterioration of a concrete placement. The laboratory work of the petrographer includes identification of the cause(s) of distress through an examination of the concrete surfaces, paste and aggregate conditions. Sometimes the alkaline cement paste can cause dissolution of siliceous aggregates or cause chemical and volume changes carbonate rocks. These reactions are collectively called alkali-aggregate reactions. These reactions are deleterious when they cause enough expansive force within concrete to rupture the concrete despite the powerful bonding within the cement paste. This presentation will cover what we commonly look for when assessing Alkali Aggregate Reactions (AAR) in hardened concrete.

Registration opens at 9:30 am.  The presentation will begin at 10:00 am.  Q&A will begin at 11:00 am.  The event will conclude no later than 11:30 am.