Authors: Radwan, M. M.; Advisor: -; Participants: Nagi, Shaymaa M. (2022)
Evaluation of the final setting time was carried out on the material pastes of normal consistency prepared with distilled water at a liquid/solid ratio of 0.23 ml/g as given in “Setting time” section. The recorded average setting time was 20 min at 37 °C (average of five readings). Figure 3 shows the hardness data of samples cured in the different hydration media at all curing ages. Figure 3 indicates that the hardness values of samples cured in distilled water (DW) increase with the hydration period from one day and up to 14 days, while for samples cured in SBF solution and the Pseudomonas aeruginosa microbe in MHB media there was a decrease in the hardness values at all curing ages....
Authors: Radwan, M. M.; Advisor: -; Participants: Khallaf, M. E. (2022)
Setting time and micro-hardness
The setting time of the synthesized material was carried out according to “Setting time” section by using the workable paste prepared at a water/powder ratio of 0.22 ml/g. Mixing the dry material powder with distilled water in such proportion results in a workable paste by which final setting time is determined. The average final setting time was found to be 22 min at 37 °C. In this investigation, the micro-hardness was considered as a mechanical property for the influence of Streptococcus thermophilus microbe incubated in nutrient broth media (NB) on the hydraulic behavior of the hardened pastes at the different curing periods in comparison with those...
Authors: Radwan, M. M.; Advisor: -; Participants: Abd EL-Hamid, H. K.; Nagi, Shaymaa M. (2021)
The XRD results indicate that there is an acceleration effect on the hydration reactions and decrease in the rate of conversion process of C3A phase composite due to the presence of free ions in saliva solution which was emphasized by the results of the IR spectral bands of the hydrated paste samples. The SEM micrographs showed a more-dense microstructure with large accumulations of aluminate hydrate crystals of samples cured under saliva solution. Results of the prepared C3A-CGICs showed that 10wt% C3A-GIC group had the highest statistically significant mean Ca, P wt% and SBS values on CAD compared to 5wt% C3A-GIC and CGIC.
