Self-Healing Capability of Fiber-Reinforced Cementitious Composites for Recovery of Watertightness andMechanical Properties

Materials

Tomoya Nishiwaki¹  Hirozo Mihashi¹  Makoto Yamada¹  Sukmin Kwon¹  Daisuke Homma² 

[1] Department of Architecture and Building Science, Tohoku University, Aoba 6-6-11-1205, Aramaki, Aoba-ku, Sendai 980-8579, Japan;Takenaka Research & Development Institute, Takenaka Corporation, Ohtsuka 1-5-1, Inzai,Chiba 270-1395, Japan;

关键词: self-healing;    fiber reinforced cementitious composite (FRCC);    watertightness;    mechanical property;    synthetic fiber;    steel fiber;    bond strength;    pull-out test;   

DOI  :  10.3390/ma7032141

来源: DOAJ

【 摘 要 】

Various types of fiber reinforced cementitious composites (FRCCs) were experimentally studied to evaluate their self-healing capabilities regarding their watertightness and mechanical properties. Cracks were induced in the FRCC specimens during a tensile loading test, and the specimens were then immersed in static water forself-healing. By water permeability and reloading tests, it was determined that the FRCCs containing synthetic fiber and cracks of width within a certain range (<0.1 mm) exhibited good self-healing capabilities regarding their watertightness. Particularly, the high polarity of the synthetic fiber (polyvinyl alcohol (PVA)) series and hybrid fiber reinforcing (polyethylene (PE) and steel code (SC)) series showed high recovery ratio. Moreover, these series also showed high potential of self-healing of mechanical properties. It was confirmed that recovery of mechanical property could be obtained only in case when crack width was sufficiently narrow, both the visible surface cracks and the very fine cracks around the bridging of the SC fibers. Recovery of the bond strength by filling of the very fine cracks around the bridging fibers enhanced the recovery of the mechanical property.

【 授权许可】

Unknown