Damage mechanisms of concrete under frost deicing salt attack (AGB1995/027)
Overview
Background & policy context:
The main aim of this project is to determine experimentally the decisive damage mechanisms relied to the phase transition of the pore solution in concrete.
The damage is separated into the cause, the ice formation within the pore system and the consequence that leads to a change of the pore system.
The change of the pore system which leads to permanent residual damage is characterized by expansion measurement, microscopical analysis (SEM, confocal microscope etc.), mercury intrusion (MIP) and acoustic emission technique.
Objectives:
The investigations will show the possible damage mechanisms caused by the frost-thaw resistance of concrete.
From a knowledge of the relevant damage mechanisms will be derived, which test criteria result from a desired freeze-thaw resistance.
Methodology:
The topic is studied by means of calorimetric methods, ultrasonic pulse transit time measurement, temperature distribution and expansion measurement.
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