TY - RPRT TI - Ultrasonic evaluation methods applicable to polymer concrete composites AU - Garbacz, Andrzej AU - Garboczi, Edward J PY - 2003 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NIST IR 6975 DO - 10.6028/NIST.IR.6975 ER -