2026-10-29T22:44:18Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/74772023-04-17T11:09:10Zcom_10259_6171com_10259_5086com_10259_2604col_10259_6172

00925njm 22002777a 4500 dc Revilla Cuesta, Víctor author Skaf Revenga, Marta author Chica Páez, José Antonio author Ortega López, Vanesa author Manso Villalaín, Juan Manuel author 2023-02 Recycled Aggregate (RA) usually increases porosity and weakens Interfacial Transition Zones (ITZs) of concrete, which favors the appearance of internal thermal damage. Four Self-Compacting Concrete (SCC) mixes with coarse and fine RA were subjected to positive and negative cyclic temperature variations to characterize their thermal damage and quantify its effects. Two damage mechanisms were found. On the one hand, micro-cracks appeared in the ITZs. On the other hand, micro-cracks arose from the micro-pores and propagated through the cementitious matrix. Both damage mechanisms were promoted by the use of coarse and fine RA, respectively. The damage was most notable at sub-zero temperatures and when adding coarse RA. Furthermore, it primarily affected compressive strength, although ultrasonic pulse velocity and hardened density also decreased, which served as non-destructive indicators to indirectly quantify the level of thermal internal damage of SCC. 0167-577X http://hdl.handle.net/10259/7477 10.1016/j.matlet.2022.133628 Self-compacting concrete Recycled aggregate Cyclic temperature change Thermal internal damage Microstructural characterization Indicator non-destructive property Quantification and characterization of the microstructural damage of recycled aggregate self-compacting concrete under cyclic temperature changes