The addition of calcium carbonate nanoparticles (nano-CaCO 3) accelerates the hydration of Portland cement improving its mechanical properties. Conversely, nano-CaCO 3 addition leads to reduction in the water required during initial PC hydration. Therefore, the use of a correct water-to-powder ratio is fundamental for manipulating this hydraulic cement. This study evaluated the effect of nano-CaCO 3 addition and different water-to-powder ratios on the physicochemical properties of white Portland cement (WPC). WPC was associated to different concentrations of nano-CaCO 3 , and the following experimental groups were created: G1a (no nano-CaCO 3); G2a (0.5% nano-CaCO 3), G3a (1% nano-CaCO 3), G4a (2% nano-CaCO 3), and G5a (5% nano-CaCO 3). The setting-time (ST), compressive strength (CS), dimensional change (DC), solubility (S), and pH were assessed (24 hr and 30 days). Next, WPC + 5% nano-CaCO 3 was manipulated varying the water-to-powder ratio: G1b (WPC/0.33 ml); G2b (WPC/nano-CaCO 3 /0.33 ml); G3b (WPC/0.29 ml); G4b (WPC/nano-CaCO 3 /0.29 ml); G5b (WPC/0.26 ml); and G6b (WPC/nano-CaCO 3 /0.26 ml). The tests were repeated. The data analysis (2-way ANOVA and Tukey test, α = 5%) demonstrated that ST was shorter for samples containing nano-CaCO 3 (p < .05). Reduction in CS was observed for all groups at 30 days, except G5a, G2b, and G6b (p < .05). DC and S had no statistical difference among groups (p > .05) independently of nano-CaCO 3 water-topowder ratio. After 30 days, there was significant reduction in pH for G3a and G6b (p < .05). The different concentrations of nano-CaCO 3 and water-to-powder ratios affected the physicochemical properties of WPC, especially the setting-time and compressive strength.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.