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Effect of shape memory alloy fiber content and preloading level on the self-healing properties of smart cementitious composite (SMA-ECC).

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Title: Effect of shape memory alloy fiber content and preloading level on the self-healing properties of smart cementitious composite (SMA-ECC).
Authors: Chen, Weihong1,2 (AUTHOR), Lin, Boxu1 (AUTHOR), Feng, Kai1 (AUTHOR), Cui, Shuangshuang3 (AUTHOR), Zhang, Dong1 (AUTHOR) zhangdong_ce@fzu.edu.cn
Source: Construction & Building Materials. Jul2022, Vol. 341, pN.PAG-N.PAG. 1p.
Subjects: Self-healing materials, Shape memory effect, Shape memory alloys, Cement composites, Crack closure, Fibers, Healing, Self-efficacy
Abstract: • Shape memory alloy (SMA) fibers are used in ECC to achieve good self-healing properties. • The efficiency of the healing of cracks reduced with the increase in the width of the initial cracks. • The efficiency of the self-healing of crack increased significantly with increasing SMA fiber content from 0.3% to 0.7%. • The recovery rate decreased significantly with increasing preloading levels. Shape memory alloy (SMA) fibers are used in engineered cementitious composite (ECC) to achieve good self-healing properties in the newly developed smart cementitious material (SMA-ECC). This study focuses on the effect of SMA fiber content and preloading level on the self-healing properties of SMA-ECC through a two-stage four-point bending test. The self-healing effect was evaluated in terms of recovery of cracks, mechanical properties, and internal damage before and after self-healing. The results showed that the efficiency of the healing of cracks reduced with the increase in the width of the initial cracks. Cracks less than 50 µm width can be healed in SMA-ECC, while cracks larger than 200 µm width were the upper limit for the healing. The efficiency of the self-healing in terms of crack closure increased significantly with increasing SMA fiber content from 0.3% to 0.7% but did not change obviously when SMA fiber content increased from 0.7% to 1%. The recovery of flexural properties and damage decreased significantly with increasing preloading level. A high SMA fiber content was required for self-healing behavior at a high preloading level. At the pre-loading ratio of 50% and 70%, the recovery of flexural properties reached the maximum at the SMA fiber content of 0.7%. But at the pre-loading ratio of 90%, the recovery of flexural properties increased with increasing fiber content. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:• Shape memory alloy (SMA) fibers are used in ECC to achieve good self-healing properties. • The efficiency of the healing of cracks reduced with the increase in the width of the initial cracks. • The efficiency of the self-healing of crack increased significantly with increasing SMA fiber content from 0.3% to 0.7%. • The recovery rate decreased significantly with increasing preloading levels. Shape memory alloy (SMA) fibers are used in engineered cementitious composite (ECC) to achieve good self-healing properties in the newly developed smart cementitious material (SMA-ECC). This study focuses on the effect of SMA fiber content and preloading level on the self-healing properties of SMA-ECC through a two-stage four-point bending test. The self-healing effect was evaluated in terms of recovery of cracks, mechanical properties, and internal damage before and after self-healing. The results showed that the efficiency of the healing of cracks reduced with the increase in the width of the initial cracks. Cracks less than 50 µm width can be healed in SMA-ECC, while cracks larger than 200 µm width were the upper limit for the healing. The efficiency of the self-healing in terms of crack closure increased significantly with increasing SMA fiber content from 0.3% to 0.7% but did not change obviously when SMA fiber content increased from 0.7% to 1%. The recovery of flexural properties and damage decreased significantly with increasing preloading level. A high SMA fiber content was required for self-healing behavior at a high preloading level. At the pre-loading ratio of 50% and 70%, the recovery of flexural properties reached the maximum at the SMA fiber content of 0.7%. But at the pre-loading ratio of 90%, the recovery of flexural properties increased with increasing fiber content. [ABSTRACT FROM AUTHOR]
ISSN:09500618
DOI:10.1016/j.conbuildmat.2022.127797