1. Research Engineer, Dept. of Research and Development, Contech Construction Products, Inc., 11835 NE Glenn Widing Dr., Portland, OR 97220 (corresponding author).
2. Chief Technology Officer, Contech Construction Products, Inc., 11835 NE Glenn Widing Dr., Portland, OR 97220.
3. Lab Technician, Dept. of Research and Development, Contech Construction Products, Inc., 11835 NE Glenn Widing Dr., Portland, OR 97220.