Performance of Self‑healing Cementitious Mortar with PVA Fiber and SAP

Although concrete materials generally exhibit outstanding mechanical properties, it is susceptible against crack formation. It has been reported that narrow cracks (≤ 150 µm) could be naturally sealed in the cement matrix by externally supplied water-induced hydration. However, the crack width of la...

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Published in:International journal of concrete structures and materials Vol. 18; no. 5; pp. 1035 - 1050
Main Authors: Sukmin Kwon, Sugyu Lee, Hyunuk Kang, Min Kyoung Kim, Sungwun Her, Sungchul Bae, Dong Joo Kim, Juhyuk Moon
Format: Journal Article
Language:English
Published: 한국콘크리트학회 01.09.2024
Subjects:
토목공학
Evaluation
Self-healing
Mortar
Cement hydration
Internal curing
ISSN:1976-0485, 2234-1315
Online Access:Get full text
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Abstract Although concrete materials generally exhibit outstanding mechanical properties, it is susceptible against crack formation. It has been reported that narrow cracks (≤ 150 µm) could be naturally sealed in the cement matrix by externally supplied water-induced hydration. However, the crack width of larger than 150 µm is difficult to be sealed without using additional self-healing admixture. In this study, the self-healing cementitious mortar was successfully developed by using a combination of polyvinyl alcohol (PVA) fiber and superabsorbent polymer (SAP), aiming to heal the wide cracks. Although the mechanical properties were slightly reduced, it shows outstanding self-healing performance by using the dual admixtures. A self-healing rate of 60% was observed in the control sample with an initial crack width of 300 µm, while a self-healing rate of nearly 100% was confirmed with suitable SAP and PVA. In addition, it was confirmed that lower hydration degree of self-healing mortar in early stage contributes to the enhanced self-healing performance of developed composite system by internally supplied water from SAP. KCI Citation Count: 0
AbstractList Although concrete materials generally exhibit outstanding mechanical properties, it is susceptible against crack formation. It has been reported that narrow cracks (≤ 150 µm) could be naturally sealed in the cement matrix by externally supplied water-induced hydration. However, the crack width of larger than 150 µm is difficult to be sealed without using additional self-healing admixture. In this study, the self-healing cementitious mortar was successfully developed by using a combination of polyvinyl alcohol (PVA) fiber and superabsorbent polymer (SAP), aiming to heal the wide cracks. Although the mechanical properties were slightly reduced, it shows outstanding self-healing performance by using the dual admixtures. A self-healing rate of 60% was observed in the control sample with an initial crack width of 300 µm, while a self-healing rate of nearly 100% was confirmed with suitable SAP and PVA. In addition, it was confirmed that lower hydration degree of self-healing mortar in early stage contributes to the enhanced self-healing performance of developed composite system by internally supplied water from SAP. KCI Citation Count: 0
Author Juhyuk Moon
Dong Joo Kim
Sungchul Bae
Sukmin Kwon
Hyunuk Kang
Sugyu Lee
Sungwun Her
Min Kyoung Kim
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Self-healing
Mortar
Cement hydration
Internal curing
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Title Performance of Self‑healing Cementitious Mortar with PVA Fiber and SAP
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