Experimental Study of Time-Lag Phenomena in Prestressed Concrete Structures.

In the context of research on the redistribution of hyperstatic stresses in prestressed concrete structures whose static configuration varies with time, a long term experimental study was made of three structures. After reviewing the orders of magnitude of the principal parameters involved in the rheology of concrete and the definition of a methodology of long term measurements on structures, the author describes two original instruments developed: a hydraulic dynamometer for measuring bearing pressures, and a detector strain gage for measuring local strains.