RT info:eu-repo/semantics/article
T1 Self-compacting concrete with recycled concrete aggregate subjected to alternating-sign temperature variations: Thermal strain and damage
A1 Revilla Cuesta, Víctor
A1 Skaf Revenga, Marta
A1 Santamaría, Amaia
A1 Espinosa González, Ana Belén
A1 Ortega López, Vanesa
K1 Self-compacting concrete
K1 Recycled concrete aggregate
K1 Extreme-ambient cyclical temperature increases
K1 Linear thermal expansion coefficient
K1 Internal damage
K1 Hygroscopicity
K1 Ingeniería civil
K1 Civil engineering
K1 Materiales de construcción
K1 Building materials
AB Any variation in temperature alters the dimensions of a concrete structure and provokes thermalstress. Moreover, the propagation of micro-cracking decreases the strength of concrete that isexposed to sub-zero temperatures (freezing), to heat phenomena (heating), or to cyclical thermalvariations, especially when prepared using Recycled Concrete Aggregate (RCA). A reference selfcompacting concrete (SCC) mix made with 100% coarse and fine natural aggregate and three SCCmixes containing 100% coarse and/or fine RCA in replacement of natural aggregate were testedin this study of the thermal performance of SCC and the related effects of RCA. The mixtures weresubjected to five thermal tests designed with positive and negative, and both constant andcyclical, extreme-ambient temperature variations, reaching temperatures of − 15 ◦C and 70 ◦C.Stiffness, weight, compressive strength, thermal deformability, and internal damage of the SCCmixtures were monitored throughout suitable testing. Internal damage, hygroscopicity, and lossof 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 RCAfractions 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 extremeenvironmental conditions.
PB Elsevier
SN 2214-5095
YR 2022
FD 2022-12
LK http://hdl.handle.net/10259/7989
UL http://hdl.handle.net/10259/7989
LA eng
NO The authors wish to express their gratitude for funding this research work to: the Spanish Ministry of Universities, MICINN, AEI, EU and ERDF [PID2020–113837RB-I00; PID2021–124203OB-I00; RTI2018–097079-B-C31; 10.13039/501100011033; FPU17/03374]; the Junta de Castilla y León (Regional Government) and ERDF [UIC-231, BU119P17]; the Basque Regional Government through the consolidated research group SAREN [IT1619–22]; Youth Employment Initiative (JCyL) and ESF [UBU05B_1274]; and the University of Burgos [Y135. GI].
DS Repositorio Institucional de la Universidad de Burgos
RD 23-nov-2024