Influence of self-healing property of Ultra-High Performance Concrete under aggressive environment

This paper investigates the evolution of self-healing properties ultra-high performance concrete exposed to aggressive environments. Double edge wedge splitting UHPC specimens with 0.8% crystalline admixture and 1.5% steel fibre by volume have been first pre-cracked up a average 0.30 mm crack opening displacement (COD) obtained two linear variable differential transformers attached both sides sample surface. Then, samples three different environments: tap water, salt water (a NaCl aqueous solution at 3.3% concentration) geothermal from power plant. After one month exposure, were carried out re-crack know properties. The results ultrasonic pulse velocity tests (UPV) reveal that exhibit highest rate recovery along exposure time, while those show lowest. calculated indexes cracking (ICS) 73.8% closure in 58.4% 43.9% water. Additionally, index damage recovery, evaluated UPV frequencies as well stress vs. COD curves pre-cracking post-healing re-cracking on specimens, equivalent tensile also indicate higher level healing capable inducing significant mechanical