ABSTRACT
Abstract The general framework of this work is the study of the behavior of concretes containing limestone aggregates of Lorraine (north eastern of France) submitted to freezing and thawing cycles. Properties of these concretes are compared to those of a siliceous concrete. Measurements of ultrasonic waves velocities, gas permeability and compressive strength allow to put in obviousness that the degradations occur in majority before 25 freezing and thawing cycles and evolve then few between 25 and 300 cycles. SEM observations show the appearance of secondary ettringite in relationship with the creation and the opening of cracks. Results indicate that the homogeneity of paste-aggregate contact influences frost resistance, that is weaker for concretes with siliceous aggregates than for concretes with calcareous aggregates. Keywords: calcareous aggregates, durability, freezing and thawing cycles, frost resistance, paste-aggregate contact.
