Mechanical Strength and Hydration Characteristics of Cement Mixture with Highly Concentrated Hydrogen Nanobubble Water

Abstract

In this study, highly concentrated hydrogen nanobubble water was utilized as the blending water for cement mortar to improve its compressive and flexural strengths. Highly concentrated nanobubbles can be obtained through osmosis. This concentration was maintained by sustaining the osmotic time. The mortar specimens were cured for 28 days, in which the nanobubble concentration was increased. This improved their flexural strength by 2.25–13.48% and compressive strength by 6.41–11.22%, as compared to those afforded by plain water. The nanobubbles were densified at high concentrations, which caused a decrease in their diameter. This increased the probability of collisions with the cement particles and accelerated the hydration and pozzolanic reactions, which facilitated an increase in the strength of cement. Thermogravimetric analysis and scanning electron microscopy were used to confirm the development of calcium silicate hydrate (C-S-H) and hydration products with an increase in the nanobubble concentration. Quantitative analysis of the hydration products and the degree of hydration were calculated by mineralogical analysis.

Characteristics of Ultrafine Bubbles (Bulk Nanobubbles) and Their Application to Particle-Related Technology

“…Compared with mixing method, the specific surface area and surface smoothness of nanosized CaCO 3 -containing handsheets increased. Water containing ultrafine bubbles of hydrogen at high concentrations was used as the blending solvent for preparing cement mortar (Kim W.-K. et al, 2021). The cement mortar had greater flexural and compressive strengths than plain water-based mortars.…”

Hydrogen Nanobubbles Generated In Situ from Nanoscale Zerovalent Iron with Water to Further Enhance Selenite Sequestration

“…9 Highly concentrated HNBs enhance the collision between the solvent and cement particles, accelerating the hydration reactions. 25 In terms of environmental applications, HNBs were reported to have important applications in the treatment of metal contamination, for example, HNB water alleviated copper (Cu) stress in Daphnia magna by depressing Cu bioaccumulation; 26 HNB water significantly decreased Cu bioaccumulation in Chlorella and affects Cu uptake kinetics by reducing the affinity between Cu and the Cu transport protein and by reducing Cu transport protein concentrations. 24 But until now, little has been documented on how HNBs affect the pollutant removal efficiency in the nZVI-H 2 O system.…”

“…Hydrogen nanobubbles (HNBs), which were prepared by filtrating-extracting the purified water through a natural aluminosilicate mineral, could exist stably in water, even after 8 to 13 months of storage, and approximately half of the bubbles still remain . Highly concentrated HNBs enhance the collision between the solvent and cement particles, accelerating the hydration reactions . In terms of environmental applications, HNBs were reported to have important applications in the treatment of metal contamination, for example, HNB water alleviated copper (Cu) stress in Daphnia magna by depressing Cu bioaccumulation; HNB water significantly decreased Cu bioaccumulation in Chlorella and affects Cu uptake kinetics by reducing the affinity between Cu and the Cu transport protein and by reducing Cu transport protein concentrations .…”

Special Issue: “Ceramics and Construction Materials”

“…Several published articles are focused on binders and concrete [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ], so showing the great scientific interest associated to these materials. Attention has been reserved to the low-carbon cements, i.e., cementing binders produced with low greenhouse emissions [ 1 , 2 ].…”

“…As far as the properties of cementitious mixes obtained by means of innovative technologies, in article [ 3 ] the effect of a particular kind of mixing water, i.e., the hydrogen nanobubbles water (HNBW) has been investigated on Portland cement mortars. The authors studied the effect of HNBW concentration on compressive and flexural strengths of mortars and showed its beneficial effects.…”