Kriechen und mechanische Eigenschaften von Straßenbetonen nach AKR‐provozierender Lagerung.

Creep and mechanical properties of pavement concretes after ASR‐provocative storage Four pavement concretes were subjected to ASR‐provoking storage with the FIB climate simulation concrete prism test which has been developed on F.A. Finger‐Institute for Building Materials Science of Bauhaus University Weimar. Strains, compressive strength, elastic modulus, creep and shrinkage have been determined. The results show, that the ASR‐induced damage process can be described as follows: ASR‐induced micro‐cracking in the cement matrix is rather negligible for compressive strength of concrete. Dissolution processes and cracking in the aggregate reduce the stiffness of the concrete (modulus of elasticity), but not the compressive strength of concrete. The cracks that originate in the rock grain of slow‐reacting aggregates continue into the matrix. With a larger matrix volume and thus increased crack formation, creep is increased. Undamaged concrete shows marginally larger creep under the influence of salt solution (NaCl solution). This indicates a chemical influence of the matrix. [ABSTRACT FROM AUTHOR]