Tanyildizi, HarunBulut, Metehan2024-11-072024-11-0720240899-15611943-5533https://doi.org/10.1061/JMCEE7.MTENG-16871https://hdl.handle.net/11480/15157This study investigated the self-healing performance of nanosilica-modified engineered cementitious composites (ECCs) exposed to high temperatures. Nanosilica (NS) was used in 0%, 0.25%, 0.50%, and 0.75% proportions of cementitious materials by mass in the mixtures. NS-modified ECC cylindrical samples (o100x200 mm) were produced and cured at 23 degrees C +/- 2 degrees C for 28 days. Then, these samples were exposed to 20 degrees C +/- 2 degrees C, 100 degrees C, 200 degrees C, 300 degrees C, 400 degrees C, 500 degrees C, 600 degrees C, 700 degrees C, and 800 degrees C temperatures. After the samples were cooled at room temperature, microcracks were formed in the ECC samples, but the samples exposed to higher than 400 degrees C were dispersed when the crack was formed. The wetting-drying cycles were applied for the self-healing of cracked samples. Lastly, the splitting tensile strength, ultrasonic pulse velocity, and chloride ion permeability of the NS-modified ECC samples were determined. Scanning electron microscopy (SEM), and energy-dispersive X-ray (EDX), X-ray diffraction analysis (XRD), and Fourier transform infrared spectroscopy (FTIR) analyses were also performed to examine the microstructure of NS-modified ECC samples. This study found that all samples were self-healed within 15 days, and the highest splitting tensile strength recovery rate was obtained from 0.75 NS-modified ECC samples with 107.44%.eninfo:eu-repo/semantics/closedAccessEngineered cementitious composites (ECCs)Nanosilica (NS)High temperaturesSelf-healingArticle36610.1061/JMCEE7.MTENG-168712-s2.0-85188540325Q1WOS:001202656600027N/A