Four proposed new standards are being developed by subcommittees under the jurisdiction of ASTM Committee C09 on Concrete and Concrete Aggregates. Subject matter covered by these standards includes aggregate resistivity, lightweight aggregates, methacrylate bonding systems and semi-adiabatic calorimetry. All interested parties are invited to participate in the standards-developing activities of ASTM Committee C09 subcommittees. ? www.astm.org