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http://dx.doi.org/10.11112/jksmi.2016.20.6.010

The Effects of Self-Healing for Ternary Blended Cement in Tap-water and Sea-water  

Kim, Tae-Wan (Research Institute of Industrial Technology (RIIT), Pusan National University)
Publication Information
Journal of the Korea institute for structural maintenance and inspection / v.20, no.6, 2016 , pp. 10-19 More about this Journal
Abstract
The objective of this study is to investigate the self-healing properties of ternary blended cement(TBC) paste made with OPC, GGBFS and FA. The influence of OPC-GGBFS-FA on the self-healing ability of ternary blended cement paste was researched by ultrasonic pulse velocity(UPV) measurement. The TBC paste with GGBFS-FA replacement ratios of 20%, 40% and 60% were prepared having a constant water-cementitious materials ratios os 0.5. The research focuses on behavior after 28days(after loading). Four-point bending tests are used to pre-cracked the prismatic specimens at 28days. For specimens (uncracked and cracked) submerged in tap-water and sea-water until 60days. According to the experimental results, the TBC paste system has self-healing ability increased when the fraction of GGBFS increased. Because GGBFS and FA continues to hydrate after 28days, it is likely that hydrated products from GGBFS and FA may modify microstructures, seal these cracks. From these results, it is clear that the crack in all samples experience self-healing and that this occurs mostly in the first 30days of submerging. Futhermore, most of the healing for both specimens of submerged in sea-water and tap-water occurred during the first 30days. Sea-water submerged specimens healed cracks as fast as those in tap-water. Differences in healing effects of submerged in sea-water and tap-water may be attributed to the presence of specific sea-water ions. Therefore, self-healing effects considered age-effects was more strong effect occurred mostly in the first 30days, and then gradually weaken.
Keywords
Ternary blended cement; Ultrasonic pulse velocity; Sea-water; Tap-water; Self-healing; Age-effect;
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Times Cited By KSCI : 2  (Citation Analysis)
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