Sukmin Kwon, Sugyu Lee, Hyunuk Kang, Min Kyoung Kim, Sungwun Her, Sungchul Bae, Dong Joo Kim, Juhyuk Moon
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引用次数: 0
摘要
尽管混凝土材料一般都具有出色的机械性能,但它很容易形成裂缝。据报道,窄裂缝(≤ 150 µm)可通过外部供水诱导水化自然封闭在水泥基体中。然而,如果不使用额外的自愈合外加剂,宽度大于 150 µm 的裂缝很难被密封。在这项研究中,通过使用聚乙烯醇(PVA)纤维和超吸收聚合物(SAP)的组合,成功开发了自愈合水泥基砂浆,旨在愈合宽裂缝。虽然机械性能略有下降,但通过使用双重掺合料,它显示出了出色的自愈合性能。在初始裂缝宽度为 300 µm 的对照样品中观察到的自愈合率为 60%,而使用适当的 SAP 和 PVA 后,自愈合率接近 100%。此外,研究还证实,早期自愈合砂浆的水化程度较低,这有助于通过 SAP 内部供应的水增强所开发复合系统的自愈合性能。
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 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.
期刊介绍:
The International Journal of Concrete Structures and Materials (IJCSM) provides a forum targeted for engineers and scientists around the globe to present and discuss various topics related to concrete, concrete structures and other applied materials incorporating cement cementitious binder, and polymer or fiber in conjunction with concrete. These forums give participants an opportunity to contribute their knowledge for the advancement of society. Topics include, but are not limited to, research results on
Properties and performance of concrete and concrete structures
Advanced and improved experimental techniques
Latest modelling methods
Possible improvement and enhancement of concrete properties
Structural and microstructural characterization
Concrete applications
Fiber reinforced concrete technology
Concrete waste management.