Autogenous healing of engineered cementitious composites under wet-dry cycles

作者：Yang Yingzi; Lepech Michael D; Yang En Hua; Li Victor C^*

来源：Cement and Concrete Research, 2009, 39(5): 382-390.

DOI：10.1016/j.cemconres.2009.01.013

• Self-healing
• Mechanical properties
• Transport properties
• Tensile properties
• Permeability
• Cracks

Self-healing of Engineered Cementitious Composites (ECC) subjected to two different cyclic wetting and drying regimes was investigated in this paper. To quantify self-healing, resonant frequency measurements were conducted throughout wetting-drying cycles followed by uniaxial tensile testing of self-healing ECC specimens. Through self-healing, crack-damaged ECC recovered 76% to 100% of its initial resonant frequency value and attained a distinct rebound in stiffness. Even for specimens deliberately pre-damaged with microcracks by loading up to 3% tensile strain, the tensile strain capacity after self-healing recovered close to 100% that of virgin specimens without any preloading. Also, the effects of temperature during wetting-drying cycles led to an increase in the ultimate strength but a slight decrease in the tensile strain capacity of rehealed pre-damaged specimens. This paper describes the experimental investigations and presents the data that confirm reasonably robust autogenous healing of ECC in commonly encountered environments for many types of infrastructure.

• 出版日期2009-5