Magnesium deterioration and lead stabilization/solidification using the toxicity characteristic leaching procedure



Recent research in cement has investigated the mechanisms of magnesium corrosion; magnesium reacting with calcium silicate hydrate (CSH) and destroying its durability. Relatively high levels of magnesium may be found in certain cements, or it may penetrate cements from seawater or soils. Magnesium, a common industrial waste component, may also contribute to the deterioration of cement-based stabilization/solidification (S/S). This article reports results showing how various amounts of magnesium may impact lead S/S treatment after short- and long-term curing. In general, lead S/S was more effective for samples with comparable mass amounts of lead and magnesium. For samples with incomparable amounts of lead and magnesium, lead leaching increased with sample curing age. Fly ash additions to cement-based stabilized/solidified treatment decreased lead leaching in the presence of magnesium. For all project samples, the addition of fly ash increased the number of samples below regulatory limits by a factor of 1.6. © 2013 American Institute of Chemical Engineers Environ Prog, 33: 437–443, 2014