Influence of microencapsulated phase change materials on the flexural behavior and micromechanical impact damage of hybrid fibre reinforced engineered cementitious composites


COMPOSITES PART B-ENGINEERING, cilt.166, ss.633-644, 2019 (SCI İndekslerine Giren Dergi) identifier identifier


The purpose of this experimental work is to investigate the effect of microencapsulated phase change materials (MicroPCM) content on the flexural behaviour and impact load-induced micromechanical damage behaviour of hybrid fibre Engineered Cementitious Composites (Hybrid-ECC). A total of five different hybrid reinforced (0.5% steel fibre and 1.5% Polyvinyl Alcohol (PVA) fibre) ECC mixes with different MicroPCM content (0%, 1%, 2%, 3% and 5% by weight) were prepared. Toughness indices, deflection at max load, flexural modulus, strength at first-cracking and post-cracking stages were determined and characterized in detail. In addition, 3D X-ray computed tomography technique accompanied by digital image analysis were applied for the quantitative assessment of impact load-induced microstructural damages. The results showed that there were no direct relationships between the MicroPCM content and the flexural modulus and the toughness indices. However, the ductility capacity (deflection at ultimate load) of the Hybrid-ECC composite with 5% MicroPCM content was much higher than others. In addition, the quantitative and 3D microstructural analysis indicate that the Hybrid-ECC composite with 3% MicroPCM was the most severely damaged mix under impact loading.