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Analysis of Crack Microstructure, Self-Healing Products, and Degree of Self-Healing in Engineered Cementitious Composites
In this paper, self-healed cracks of engineered cementitious composites (ECC) are observed by optical microscope and scanning electron microscopy, and self-healing products of ECC are analyzed by X-ray diffraction technology. Meanwhile, the reasons for property differences between origin ECC and self-healed ECC with different crack structures exposed to freeze–thaw in water and deicing salt, respectively, are discussed. ECC specimens with a water–binder ratio of 0.25 with 50% fly ash are studied. The experimental results show that the white self-healing products and other chemical composites similar to the color of ECC matrix are present on the surface of self-healed cracks. The self-healing materials of ECC include kinds of hydration/carbonation products and some chemical compounds penetrating into ECC matrix from self-healing environments. Additionally, the differences in self-healing products and hydration products of binder, self-healing extent, damaged polyvinyl alcohol fiber, weak interface bonding, and microcracks could obviously influence the value variation of first cracking stress, ultrasonic pulse viscosity, and absorption coefficient of self-healed specimens.
Analysis of Crack Microstructure, Self-Healing Products, and Degree of Self-Healing in Engineered Cementitious Composites
In this paper, self-healed cracks of engineered cementitious composites (ECC) are observed by optical microscope and scanning electron microscopy, and self-healing products of ECC are analyzed by X-ray diffraction technology. Meanwhile, the reasons for property differences between origin ECC and self-healed ECC with different crack structures exposed to freeze–thaw in water and deicing salt, respectively, are discussed. ECC specimens with a water–binder ratio of 0.25 with 50% fly ash are studied. The experimental results show that the white self-healing products and other chemical composites similar to the color of ECC matrix are present on the surface of self-healed cracks. The self-healing materials of ECC include kinds of hydration/carbonation products and some chemical compounds penetrating into ECC matrix from self-healing environments. Additionally, the differences in self-healing products and hydration products of binder, self-healing extent, damaged polyvinyl alcohol fiber, weak interface bonding, and microcracks could obviously influence the value variation of first cracking stress, ultrasonic pulse viscosity, and absorption coefficient of self-healed specimens.
Analysis of Crack Microstructure, Self-Healing Products, and Degree of Self-Healing in Engineered Cementitious Composites
Zhu, Yu (author) / Zhang, Zhao Cai (author) / Yao, Yan (author) / Guan, Xue Mao (author) / Yang, Ying Zi (author)
2016-01-12
Article (Journal)
Electronic Resource
Unknown
| British Library Online Contents | 2016
Self‐Healing Bacterial Cementitious Composites
| Wiley | 2021