The variation of linear attenuation coefficients mu (cm(-1)) with the freezing-thawing (F-T) cycles has been investigated for concretes, in which different materials were used as an aggregate. For this purposes, six different concrete blocks have been produced in various ratios of water/cement (w/c) utilizing different materials as aggregates. Then, linear attenuation coefficients were measured for five different F-T cycles. It was noticed that the linear attenuation coefficients decreased with F-T cycles for all concrete types and also different effect observed for different w/c ratio and different aggregate. (C) 2005 Elsevier Ltd. All rights reserved.