TY  - RPRT
TI  - Impact-echo : a method for flaw detection in concrete using transient stress waves
AU  - Sansalone, Mary
AU  - Carino, Nicholas J
PY  - 1986
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS IR 86-3452
DO  - 10.6028/NBS.IR.86-3452
ER  -