Effect of Hydrogen Nanobubbles on the Mechanical Strength and Watertightness of Cement Mixtures |
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| Authors: | Won-Kyung Kim Young-Ho Kim Gigwon Hong Jong-Min Kim Jung-Geun Han Jong-Young Lee |
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| Institution: | 1.School of Civil and Environmental Engineering, Urban Design and Study, Chung-Ang University, Seoul 06974, Korea; (W.-K.K.); (Y.-H.K.);2.Department of Civil and Disaster Prevention Engineering, Halla University, 28 Halladae-gil, Wonju-si, Gangwon-do 26404, Korea;3.School of Mechanical Engineering, Chung-Ang University, Seoul 06974, Korea;4.Department of Intelligent Energy and Industry, Chung-Ang University, Seoul 06974, Korea |
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| Abstract: | This study analyzed the effects of applying highly concentrated hydrogen nanobubble water (HNBW) on the workability, durability, watertightness, and microstructure of cement mixtures. The number of hydrogen nanobubbles was concentrated twofold to a more stable state using osmosis. The compressive strength of the cement mortar for each curing day was improved by about 3.7–15.79%, compared to the specimen that used general water, when two concentrations of HNBW were used as the mixing water. The results of mercury intrusion porosimetry and a scanning electron microscope analysis of the cement paste showed that the pore volume of the specimen decreased by about 4.38–10.26%, thereby improving the watertightness when high-concentration HNBW was used. The improvement in strength and watertightness is a result of the reduction of the microbubbles’ particle size, and the increase in the zeta potential and surface tension, which activated the hydration reaction of the cement and accelerated the pozzolanic reaction. |
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| Keywords: | hydrogen nanobubble water (HNBW) cement mixture mechanical strength watertightness |
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