Akademik Veri Yönetim Sistemi
5th International Conference on Scientific and Academic Research, Konya, Türkiye, 23 Aralık 2024, ss.247-255, (Tam Metin Bildiri)
Earthquake-prone regions, seismic forces pose significant risks to humans and infrastructure. Many studies are carried out to understand the effects of seismic forces on fully cured concrete, but their effects on early-age strength remains unclear. The purpose of this study is to understand how seismic excitations affect the concrete grade of C30, when different accelerations were applied in the initial and final setting phases of early-age concrete. This study uses a uniaxial shake table to understand the effects of seismic forces on concrete and compressive tests were used to determine the concrete’s strength. Concrete mixing ratio and processes were controlled by the TS 802-2016 standard code. Concrete specimens were subjected to 0.1g, 0.3g, and 0.5g accelerations, where the control specimens were undisturbed by seismic excitations. During the initial setting stage (1h, 2h, and 4h), concrete is in a fluid state and has the ability to absorb and distribute seismic energy. Smaller cracks develop inside the concrete structure, but those cracks are repaired through the hydration process and concrete strength is regained to a value close to the designed grade. The highest strength reduction is 6%. In contrast, the final setting stage (6h and 8h), concrete is in transition to harden but has not gained its full strength, any seismic disturbance will cause a permanent reduction in the compressive strength, which cannot regained in hydration process. The highest compressive reduction recorded in this phase is 14.6%. The 6h and 8h showed the highest strength reduction indicating a higher susceptibility to seismic disturbances.