Hydrogen-rich water revealed benefits in controlling the physical and mechanical performances of cement mortar

Hydration Mechanism of the Hydrogen-Rich Water Based Cement Paste

“…The FTIR spectra of all the samples show distinct peaks in the identical position with different intensities. Several IR bands at 3642, 3200–3400, 2905, 1642, 1425, 980, and 872 cm –1 appear to be due to the O–H stretching of calcium hydroxide, ν 1 and ν 2 stretching of the water molecule, H–C stretching of methyl or methylene group, ν 2 bending of the water molecule, ν 3 stretching of carbonate, Si–O stretching of polymeric silicate (C–S–H), and ν 2 stretching of carbonate, respectively. , It is reported elsewhere that the relative peak area ratio (peak area of the product phase and the methyl or a methylene group) could be an indicator of the amount of hydrated product. ,, Previously, the relative peak intensity ratio of the IR bands was measured to predict the amount of limestone formation. , In this study, the peak of the organic moieties (methyl or methylene group) appeared at 2905 cm –1 in the IR spectrum of hydrated cement paste may be due to the treating of cement samples with acetone, is considered as a base peak to yield a relative peak area ratio. ,,,, In fact, this is considered as a platform to compare the IR spectroscopic data of control sample and the hydrogen-rich water based cement sample. Sinha and Rout reported a similar analysis of the FTIR spectral data to compare the removal of hemicelluloses from the jute fiber after mercerization.…”

“…As presented in the figure, it is observed that the initial and final setting time of the cement decreases with the increase in hydrogen concentration. The initial and final setting times of the control cement (0CC) are measured to be 197 ± 6 and 257 ± 3 min, respectively, while, the same are estimated to be 8 ± 3 and 14 ± 3 min, respectively, for the 0.5 ppm hydrogen-rich water-based cement system (0.5HC) . The magnificent reduction of the setting times indicates the set acceleration action of the hydrogen-rich water.…”

“…However, the same is measured to be 32.25 ± 0.125%, 32.75 ± 0.25%, 33.25 ± 0.25%, and 34.0 ± 0.25%, for 0.2, 0.3, 0.4, and 0.5 ppm hydrogen-rich water-based cement sample, respectively. It is reported that the flow table value of the mortar prepared using hydrogen-rich water (with a water–cement ratio of 0.485) decreases gradually with the increase in hydrogen concentration . It indicates that the mortar prepared using higher concentrations of the hydrogen-rich water demands high water–cement ratio to maintain its flow.…”

“…Based on the comparative study, it seems that the use of hydrogen-rich water as a cement set accelerator would have beneficial effects as compared to that of the existing set accelerator. Recently, we have investigated the effect of hydrogen-rich water in controlling the physical and mechanical performances of the cement mortar samples . The results revealed that the use of 0.5 ppm hydrogen-rich water for the fabrication of mortar (28 days cured) increases the compressive strength, flexural strength, and deflection at the break 24%, 20%, and 127%, respectively, as compared to that of the control mortar prepared using normal water.…”

Modification of cementitious composites with graphene oxide and carbon nanotubes

“…4b, c). The characteristic groups and wavenumbers of hardened cement stones due to GO/CNTs additives have been reported in the literature [37][38][39][40][41][42][43]. Table 6 lists these characteristic groups and wavenumbers for O-H, H-O-H, Si-O, and C-O, respectively, that correspond to calcium hydroxide, chemically bound water, calcium silicate hydrate, and calcium carbonate in hardened cement paste, respectively.…”