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The durability of cementitious materials is affected by the presence of cracks. This paper proposed a novel composite material and evaluated its crack healing ability. This material consisted with engineered cementitious composite (ECC) and shape memory alloy (SMA) fibers. A total of 12 specimens were made and tested under flexural loads. Test parameters included material type and target displacement level. Test results indicated that specimens with SMA-ECC had great increase in strength and ductility compared with specimens with concrete. Specimens with SMA-ECC exhibited promising crack healing ability by effectively reducing the crack number and width. The self-healing ability reduced with increasing target displacement level. The self-healing ability was further investigated through ultrasonic pulse test. Ultrasonic pulse test results were consistent with the mechanical test results, indicating effectiveness of this test method. This composite material SMA-ECC has promising application in infrastructure critical for security to mitigate damage and heal cracks, and increases durability of the structure, and reduces maintenance cost. (c) 2021 Elsevier Ltd. All rights reserved.
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CONSTRUCTION AND BUILDING MATERIALS
ISSN: 0950-0618
Year: 2021
Volume: 290
7 . 6 9 3
JCR@2021
7 . 4 0 0
JCR@2023
ESI Discipline: MATERIALS SCIENCE;
ESI HC Threshold:142
JCR Journal Grade:1
CAS Journal Grade:2
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