Abstract
Crack formation is an inherent property of concrete structures; however, these materials also have the ability to heal cracks autogenously. External water penetrates the inside of concrete through the cracks, and unreacted cement particles present on the crack surface are rehydrated. Cracks are healed by hydration products owing to further hydration. Ground-granulated blast-furnace slag (GGBFS) and fly ash (FA) have slower reactions with water than cement. Because of this late reactivity, there is a high possibility of being present in an unreacted state inside the matrix. This study investigated the self-healing potential of supplementary cementitious materials (SCMs) such as GGBFS, FA, and calcium sulfur aluminate (CSA) expansion agents. For this purpose, isothermal calorimetry and water flow tests were performed. Experimental results showed that the self-healing potential of GGBFS and CSA expansion agent was higher than that of OPC and FA is decreased.
Highlights
Cracks in concrete structures are inevitable owing to external loads and time-dependent effects
fly ash (FA) did not significantly influence the hydration of ordinary Portland cement (OPC), and the second peak decreased in proportion to the replacement ratio
In the case of FA, the cumulative heat production owing to further hydration was decreased as compared to Plain
Summary
Cracks in concrete structures are inevitable owing to external loads and time-dependent effects. Cracks make it easier for harmful ions to penetrate into concrete. This reduces the durability of concrete structures. The durability of concrete structures is a key factor that affects the service life and maintenance costs of the structures. Various studies on improving concrete durability performance have been performed. There has been a growing interest in self-healing concrete that heals cracks naturally (Wua et al 2012; Jacobsen and Sellevold 1995; Jacobsen et al 1996; Hearn 1998; Ahn and Kishi 2010)
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