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.
