2026-10-29T17:40:26Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/79892023-11-11T01:07:08Zcom_10259_6171com_10259_5086com_10259_2604col_10259_6172

00925njm 22002777a 4500 dc Revilla Cuesta, Víctor author Skaf Revenga, Marta author Santamaría, Amaia author Espinosa González, Ana Belén author Ortega López, Vanesa author 2022-12 Any variation in temperature alters the dimensions of a concrete structure and provokes thermal stress. Moreover, the propagation of micro-cracking decreases the strength of concrete that is exposed to sub-zero temperatures (freezing), to heat phenomena (heating), or to cyclical thermal variations, especially when prepared using Recycled Concrete Aggregate (RCA). A reference selfcompacting concrete (SCC) mix made with 100% coarse and fine natural aggregate and three SCC mixes containing 100% coarse and/or fine RCA in replacement of natural aggregate were tested in this study of the thermal performance of SCC and the related effects of RCA. The mixtures were subjected to five thermal tests designed with positive and negative, and both constant and cyclical, extreme-ambient temperature variations, reaching temperatures of − 15 ◦C and 70 ◦C. Stiffness, weight, compressive strength, thermal deformability, and internal damage of the SCC mixtures were monitored throughout suitable testing. Internal damage, hygroscopicity, and loss of strength increased at temperatures below 0 ◦C, especially in the mixtures containing 100% coarse RCA, although the SCC manufactured with simultaneous additions of fine and coarse RCA fractions showed the worst performance. Overall, RCA performed better under positive temperature variations. The test results lead to the recommendation of a linear thermal expansion coefficient of 1.2⋅10− 5 ◦C− 1 in calculations for SCC containing RCA under those extreme environmental conditions. 2214-5095 http://hdl.handle.net/10259/7989 10.1016/j.cscm.2022.e01204 Self-compacting concrete Recycled concrete aggregate Extreme-ambient cyclical temperature increases Linear thermal expansion coefficient Internal damage Hygroscopicity Self-compacting concrete with recycled concrete aggregate subjected to alternating-sign temperature variations: Thermal strain and damage