June 2009

Fly ash, a Source of Fireproof Concrete?

(Aggregate Research 5-27-09) Research by William Rickard and colleagues at the Curtin University of Technology (CUT), Perth, has shown that fly ash-based geopolymers exhibit remarkable fire resistance while maintaining superior mechanical strength. The team has made geopolymers, a cement-like material formed by dissolving materials that contain silicon and aluminium, such as fly ash, in a highly alkaline solution for use in high temperature applications such as fireproofing and building insulation.

PennDOT's 'Green' Fly Ash Efforts

 (Aggregate Research 5-26-09)  PennDOT Assistant Construction Manager Michael McCart, it's a way to make roads, sidewalks and bridges stronger and longer-lasting, thanks to growing attempts to reuse it and other industrial wastes in making concrete. Concrete used for roads and buildings is a combination of stone, sand and binding agents -- usually a mix of lime and silica called portland cement -- that create chemical reactions and bind together when mixed with water.

EPA Completes First Testing of Chinese Drywall

(Harold Tribune 5-19-09) Federal officials have completed preliminary testing into tainted Chinese drywall linked to corrosion and potential health effects in Florida and other states. The U.S. Environmental Protection Agency, working in conjunction with the Agency for Toxic Substances and Disease Registry – part of the Centers for Disease Control in Atlanta – has completed initial testing of two samples of tainted Chinese drywall, along with four domestic samples used for comparison.